diff --git a/host_usb_mixer_control/.makefile b/host_usb_mixer_control/.makefile
new file mode 100644
index 00000000..595ea033
--- /dev/null
+++ b/host_usb_mixer_control/.makefile
@@ -0,0 +1,10 @@
+all:
+ @echo =======================================================
+ @echo Build complete [module only - cannot be run on its own]
+ @echo =======================================================
+
+clean:
+ @echo =======================================================
+ @echo Build clean [module only - cannot be run on its own]
+ @echo =======================================================
+
diff --git a/host_usb_mixer_control/.project b/host_usb_mixer_control/.project
new file mode 100644
index 00000000..875c0c73
--- /dev/null
+++ b/host_usb_mixer_control/.project
@@ -0,0 +1,77 @@
+
+
+ host_usb_mixer_control
+
+
+
+
+
+ org.eclipse.cdt.managedbuilder.core.genmakebuilder
+ clean,full,incremental,
+
+
+ ?name?
+
+
+
+ org.eclipse.cdt.make.core.append_environment
+ true
+
+
+ org.eclipse.cdt.make.core.autoBuildTarget
+ all
+
+
+ org.eclipse.cdt.make.core.buildArguments
+
+
+
+ org.eclipse.cdt.make.core.buildCommand
+ xmake
+
+
+ org.eclipse.cdt.make.core.cleanBuildTarget
+ clean
+
+
+ org.eclipse.cdt.make.core.contents
+ org.eclipse.cdt.make.core.activeConfigSettings
+
+
+ org.eclipse.cdt.make.core.enableAutoBuild
+ false
+
+
+ org.eclipse.cdt.make.core.enableCleanBuild
+ true
+
+
+ org.eclipse.cdt.make.core.enableFullBuild
+ true
+
+
+ org.eclipse.cdt.make.core.fullBuildTarget
+ all
+
+
+ org.eclipse.cdt.make.core.stopOnError
+ true
+
+
+ org.eclipse.cdt.make.core.useDefaultBuildCmd
+ true
+
+
+
+
+ org.eclipse.cdt.managedbuilder.core.ScannerConfigBuilder
+
+
+
+
+
+ org.eclipse.cdt.managedbuilder.core.ScannerConfigNature
+ org.eclipse.cdt.managedbuilder.core.managedBuildNature
+ org.eclipse.cdt.core.cnature
+
+
diff --git a/host_usb_mixer_control/Makefile.OSX b/host_usb_mixer_control/Makefile.OSX
new file mode 100644
index 00000000..d46367f9
--- /dev/null
+++ b/host_usb_mixer_control/Makefile.OSX
@@ -0,0 +1,2 @@
+all:
+ g++ -g -o xmos_mixer OSX/usb_mixer.cpp mixer_app.cpp -I. -IOSX OSX/libusb-1.0.0.dylib -m64
\ No newline at end of file
diff --git a/host_usb_mixer_control/Makefile.Win32 b/host_usb_mixer_control/Makefile.Win32
new file mode 100644
index 00000000..dcae45f4
--- /dev/null
+++ b/host_usb_mixer_control/Makefile.Win32
@@ -0,0 +1,4 @@
+THESYCON_DIR = C:\Program/ Files\Thesycon\XMOSinternalUsbAudio_v5.50.0_eval_2022-11-17_SDK
+
+all:
+ cl -o xmos_mixer.exe -I. -I Win32 -I $(THESYCON_DIR)\source\tusbaudioapi_inc -I $(THESYCON_DIR)\source\libwn_min mixer_app.cpp Win32\usb_mixer.cpp $(THESYCON_DIR)\lib\release\x64\tusbaudioapi.lib
diff --git a/host_usb_mixer_control/OSX/libusb-1.0.0.dylib b/host_usb_mixer_control/OSX/libusb-1.0.0.dylib
new file mode 100644
index 00000000..0e2e0778
Binary files /dev/null and b/host_usb_mixer_control/OSX/libusb-1.0.0.dylib differ
diff --git a/host_usb_mixer_control/OSX/libusb.h b/host_usb_mixer_control/OSX/libusb.h
new file mode 100644
index 00000000..11263803
--- /dev/null
+++ b/host_usb_mixer_control/OSX/libusb.h
@@ -0,0 +1,1233 @@
+/*
+ * Public libusb header file
+ * Copyright (C) 2007-2008 Daniel Drake
+ * Copyright (c) 2001 Johannes Erdfelt
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __LIBUSB_H__
+#define __LIBUSB_H__
+
+#include
+#include
+#include
+#include
+#include
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** \def libusb_cpu_to_le16
+ * \ingroup misc
+ * Convert a 16-bit value from host-endian to little-endian format. On
+ * little endian systems, this function does nothing. On big endian systems,
+ * the bytes are swapped.
+ * \param x the host-endian value to convert
+ * \returns the value in little-endian byte order
+ */
+#define libusb_cpu_to_le16(x) ({ \
+ union { \
+ uint8_t b8[2]; \
+ uint16_t b16; \
+ } _tmp; \
+ uint16_t _tmp2 = (uint16_t)(x); \
+ _tmp.b8[1] = _tmp2 >> 8; \
+ _tmp.b8[0] = _tmp2 & 0xff; \
+ _tmp.b16; \
+})
+
+/** \def libusb_le16_to_cpu
+ * \ingroup misc
+ * Convert a 16-bit value from little-endian to host-endian format. On
+ * little endian systems, this function does nothing. On big endian systems,
+ * the bytes are swapped.
+ * \param x the little-endian value to convert
+ * \returns the value in host-endian byte order
+ */
+#define libusb_le16_to_cpu libusb_cpu_to_le16
+
+/* standard USB stuff */
+
+/** \ingroup desc
+ * Device and/or Interface Class codes */
+enum libusb_class_code {
+ /** In the context of a \ref libusb_device_descriptor "device descriptor",
+ * this bDeviceClass value indicates that each interface specifies its
+ * own class information and all interfaces operate independently.
+ */
+ LIBUSB_CLASS_PER_INTERFACE = 0,
+
+ /** Audio class */
+ LIBUSB_CLASS_AUDIO = 1,
+
+ /** Communications class */
+ LIBUSB_CLASS_COMM = 2,
+
+ /** Human Interface Device class */
+ LIBUSB_CLASS_HID = 3,
+
+ /** Printer dclass */
+ LIBUSB_CLASS_PRINTER = 7,
+
+ /** Picture transfer protocol class */
+ LIBUSB_CLASS_PTP = 6,
+
+ /** Mass storage class */
+ LIBUSB_CLASS_MASS_STORAGE = 8,
+
+ /** Hub class */
+ LIBUSB_CLASS_HUB = 9,
+
+ /** Data class */
+ LIBUSB_CLASS_DATA = 10,
+
+ /** Class is vendor-specific */
+ LIBUSB_CLASS_VENDOR_SPEC = 0xff
+};
+
+/** \ingroup desc
+ * Descriptor types as defined by the USB specification. */
+enum libusb_descriptor_type {
+ /** Device descriptor. See libusb_device_descriptor. */
+ LIBUSB_DT_DEVICE = 0x01,
+
+ /** Configuration descriptor. See libusb_config_descriptor. */
+ LIBUSB_DT_CONFIG = 0x02,
+
+ /** String descriptor */
+ LIBUSB_DT_STRING = 0x03,
+
+ /** Interface descriptor. See libusb_interface_descriptor. */
+ LIBUSB_DT_INTERFACE = 0x04,
+
+ /** Endpoint descriptor. See libusb_endpoint_descriptor. */
+ LIBUSB_DT_ENDPOINT = 0x05,
+
+ /** HID descriptor */
+ LIBUSB_DT_HID = 0x21,
+
+ /** HID report descriptor */
+ LIBUSB_DT_REPORT = 0x22,
+
+ /** Physical descriptor */
+ LIBUSB_DT_PHYSICAL = 0x23,
+
+ /** Hub descriptor */
+ LIBUSB_DT_HUB = 0x29
+};
+
+/* Descriptor sizes per descriptor type */
+#define LIBUSB_DT_DEVICE_SIZE 18
+#define LIBUSB_DT_CONFIG_SIZE 9
+#define LIBUSB_DT_INTERFACE_SIZE 9
+#define LIBUSB_DT_ENDPOINT_SIZE 7
+#define LIBUSB_DT_ENDPOINT_AUDIO_SIZE 9 /* Audio extension */
+#define LIBUSB_DT_HUB_NONVAR_SIZE 7
+
+#define LIBUSB_ENDPOINT_ADDRESS_MASK 0x0f /* in bEndpointAddress */
+#define LIBUSB_ENDPOINT_DIR_MASK 0x80
+
+/** \ingroup desc
+ * Endpoint direction. Values for bit 7 of the
+ * \ref libusb_endpoint_descriptor::bEndpointAddress "endpoint address" scheme.
+ */
+enum libusb_endpoint_direction {
+ /** In: device-to-host */
+ LIBUSB_ENDPOINT_IN = 0x80,
+
+ /** Out: host-to-device */
+ LIBUSB_ENDPOINT_OUT = 0x00
+};
+
+#define LIBUSB_TRANSFER_TYPE_MASK 0x03 /* in bmAttributes */
+
+/** \ingroup desc
+ * Endpoint transfer type. Values for bits 0:1 of the
+ * \ref libusb_endpoint_descriptor::bmAttributes "endpoint attributes" field.
+ */
+enum libusb_transfer_type {
+ /** Control endpoint */
+ LIBUSB_TRANSFER_TYPE_CONTROL = 0,
+
+ /** Isochronous endpoint */
+ LIBUSB_TRANSFER_TYPE_ISOCHRONOUS = 1,
+
+ /** Bulk endpoint */
+ LIBUSB_TRANSFER_TYPE_BULK = 2,
+
+ /** Interrupt endpoint */
+ LIBUSB_TRANSFER_TYPE_INTERRUPT = 3
+};
+
+/** \ingroup misc
+ * Standard requests, as defined in table 9-3 of the USB2 specifications */
+enum libusb_standard_request {
+ /** Request status of the specific recipient */
+ LIBUSB_REQUEST_GET_STATUS = 0x00,
+
+ /** Clear or disable a specific feature */
+ LIBUSB_REQUEST_CLEAR_FEATURE = 0x01,
+
+ /* 0x02 is reserved */
+
+ /** Set or enable a specific feature */
+ LIBUSB_REQUEST_SET_FEATURE = 0x03,
+
+ /* 0x04 is reserved */
+
+ /** Set device address for all future accesses */
+ LIBUSB_REQUEST_SET_ADDRESS = 0x05,
+
+ /** Get the specified descriptor */
+ LIBUSB_REQUEST_GET_DESCRIPTOR = 0x06,
+
+ /** Used to update existing descriptors or add new descriptors */
+ LIBUSB_REQUEST_SET_DESCRIPTOR = 0x07,
+
+ /** Get the current device configuration value */
+ LIBUSB_REQUEST_GET_CONFIGURATION = 0x08,
+
+ /** Set device configuration */
+ LIBUSB_REQUEST_SET_CONFIGURATION = 0x09,
+
+ /** Return the selected alternate setting for the specified interface */
+ LIBUSB_REQUEST_GET_INTERFACE = 0x0A,
+
+ /** Select an alternate interface for the specified interface */
+ LIBUSB_REQUEST_SET_INTERFACE = 0x0B,
+
+ /** Set then report an endpoint's synchronization frame */
+ LIBUSB_REQUEST_SYNCH_FRAME = 0x0C
+};
+
+/** \ingroup misc
+ * Request type bits of the
+ * \ref libusb_control_setup::bmRequestType "bmRequestType" field in control
+ * transfers. */
+enum libusb_request_type {
+ /** Standard */
+ LIBUSB_REQUEST_TYPE_STANDARD = (0x00 << 5),
+
+ /** Class */
+ LIBUSB_REQUEST_TYPE_CLASS = (0x01 << 5),
+
+ /** Vendor */
+ LIBUSB_REQUEST_TYPE_VENDOR = (0x02 << 5),
+
+ /** Reserved */
+ LIBUSB_REQUEST_TYPE_RESERVED = (0x03 << 5)
+};
+
+/** \ingroup misc
+ * Recipient bits of the
+ * \ref libusb_control_setup::bmRequestType "bmRequestType" field in control
+ * transfers. Values 4 through 31 are reserved. */
+enum libusb_request_recipient {
+ /** Device */
+ LIBUSB_RECIPIENT_DEVICE = 0x00,
+
+ /** Interface */
+ LIBUSB_RECIPIENT_INTERFACE = 0x01,
+
+ /** Endpoint */
+ LIBUSB_RECIPIENT_ENDPOINT = 0x02,
+
+ /** Other */
+ LIBUSB_RECIPIENT_OTHER = 0x03
+};
+
+#define LIBUSB_ISO_SYNC_TYPE_MASK 0x0C
+
+/** \ingroup desc
+ * Synchronization type for isochronous endpoints. Values for bits 2:3 of the
+ * \ref libusb_endpoint_descriptor::bmAttributes "bmAttributes" field in
+ * libusb_endpoint_descriptor.
+ */
+enum libusb_iso_sync_type {
+ /** No synchronization */
+ LIBUSB_ISO_SYNC_TYPE_NONE = 0,
+
+ /** Asynchronous */
+ LIBUSB_ISO_SYNC_TYPE_ASYNC = 1,
+
+ /** Adaptive */
+ LIBUSB_ISO_SYNC_TYPE_ADAPTIVE = 2,
+
+ /** Synchronous */
+ LIBUSB_ISO_SYNC_TYPE_SYNC = 3
+};
+
+#define LIBUSB_ISO_USAGE_TYPE_MASK 0x30
+
+/** \ingroup desc
+ * Usage type for isochronous endpoints. Values for bits 4:5 of the
+ * \ref libusb_endpoint_descriptor::bmAttributes "bmAttributes" field in
+ * libusb_endpoint_descriptor.
+ */
+enum libusb_iso_usage_type {
+ /** Data endpoint */
+ LIBUSB_ISO_USAGE_TYPE_DATA = 0,
+
+ /** Feedback endpoint */
+ LIBUSB_ISO_USAGE_TYPE_FEEDBACK = 1,
+
+ /** Implicit feedback Data endpoint */
+ LIBUSB_ISO_USAGE_TYPE_IMPLICIT = 2
+};
+
+/** \ingroup desc
+ * A structure representing the standard USB device descriptor. This
+ * descriptor is documented in section 9.6.1 of the USB 2.0 specification.
+ * All multiple-byte fields are represented in host-endian format.
+ */
+struct libusb_device_descriptor {
+ /** Size of this descriptor (in bytes) */
+ uint8_t bLength;
+
+ /** Descriptor type. Will have value
+ * \ref libusb_descriptor_type::LIBUSB_DT_DEVICE LIBUSB_DT_DEVICE in this
+ * context. */
+ uint8_t bDescriptorType;
+
+ /** USB specification release number in binary-coded decimal. A value of
+ * 0x0200 indicates USB 2.0, 0x0110 indicates USB 1.1, etc. */
+ uint16_t bcdUSB;
+
+ /** USB-IF class code for the device. See \ref libusb_class_code. */
+ uint8_t bDeviceClass;
+
+ /** USB-IF subclass code for the device, qualified by the bDeviceClass
+ * value */
+ uint8_t bDeviceSubClass;
+
+ /** USB-IF protocol code for the device, qualified by the bDeviceClass and
+ * bDeviceSubClass values */
+ uint8_t bDeviceProtocol;
+
+ /** Maximum packet size for endpoint 0 */
+ uint8_t bMaxPacketSize0;
+
+ /** USB-IF vendor ID */
+ uint16_t idVendor;
+
+ /** USB-IF product ID */
+ uint16_t idProduct;
+
+ /** Device release number in binary-coded decimal */
+ uint16_t bcdDevice;
+
+ /** Index of string descriptor describing manufacturer */
+ uint8_t iManufacturer;
+
+ /** Index of string descriptor describing product */
+ uint8_t iProduct;
+
+ /** Index of string descriptor containing device serial number */
+ uint8_t iSerialNumber;
+
+ /** Number of possible configurations */
+ uint8_t bNumConfigurations;
+};
+
+/** \ingroup desc
+ * A structure representing the standard USB endpoint descriptor. This
+ * descriptor is documented in section 9.6.3 of the USB 2.0 specification.
+ * All multiple-byte fields are represented in host-endian format.
+ */
+struct libusb_endpoint_descriptor {
+ /** Size of this descriptor (in bytes) */
+ uint8_t bLength;
+
+ /** Descriptor type. Will have value
+ * \ref libusb_descriptor_type::LIBUSB_DT_ENDPOINT LIBUSB_DT_ENDPOINT in
+ * this context. */
+ uint8_t bDescriptorType;
+
+ /** The address of the endpoint described by this descriptor. Bits 0:3 are
+ * the endpoint number. Bits 4:6 are reserved. Bit 7 indicates direction,
+ * see \ref libusb_endpoint_direction.
+ */
+ uint8_t bEndpointAddress;
+
+ /** Attributes which apply to the endpoint when it is configured using
+ * the bConfigurationValue. Bits 0:1 determine the transfer type and
+ * correspond to \ref libusb_transfer_type. Bits 2:3 are only used for
+ * isochronous endpoints and correspond to \ref libusb_iso_sync_type.
+ * Bits 4:5 are also only used for isochronous endpoints and correspond to
+ * \ref libusb_iso_usage_type. Bits 6:7 are reserved.
+ */
+ uint8_t bmAttributes;
+
+ /** Maximum packet size this endpoint is capable of sending/receiving. */
+ uint16_t wMaxPacketSize;
+
+ /** Interval for polling endpoint for data transfers. */
+ uint8_t bInterval;
+
+ /** For audio devices only: the rate at which synchronization feedback
+ * is provided. */
+ uint8_t bRefresh;
+
+ /** For audio devices only: the address if the synch endpoint */
+ uint8_t bSynchAddress;
+
+ /** Extra descriptors. If libusb encounters unknown endpoint descriptors,
+ * it will store them here, should you wish to parse them. */
+ const unsigned char *extra;
+
+ /** Length of the extra descriptors, in bytes. */
+ int extra_length;
+};
+
+/** \ingroup desc
+ * A structure representing the standard USB interface descriptor. This
+ * descriptor is documented in section 9.6.5 of the USB 2.0 specification.
+ * All multiple-byte fields are represented in host-endian format.
+ */
+struct libusb_interface_descriptor {
+ /** Size of this descriptor (in bytes) */
+ uint8_t bLength;
+
+ /** Descriptor type. Will have value
+ * \ref libusb_descriptor_type::LIBUSB_DT_INTERFACE LIBUSB_DT_INTERFACE
+ * in this context. */
+ uint8_t bDescriptorType;
+
+ /** Number of this interface */
+ uint8_t bInterfaceNumber;
+
+ /** Value used to select this alternate setting for this interface */
+ uint8_t bAlternateSetting;
+
+ /** Number of endpoints used by this interface (excluding the control
+ * endpoint). */
+ uint8_t bNumEndpoints;
+
+ /** USB-IF class code for this interface. See \ref libusb_class_code. */
+ uint8_t bInterfaceClass;
+
+ /** USB-IF subclass code for this interface, qualified by the
+ * bInterfaceClass value */
+ uint8_t bInterfaceSubClass;
+
+ /** USB-IF protocol code for this interface, qualified by the
+ * bInterfaceClass and bInterfaceSubClass values */
+ uint8_t bInterfaceProtocol;
+
+ /** Index of string descriptor describing this interface */
+ uint8_t iInterface;
+
+ /** Array of endpoint descriptors. This length of this array is determined
+ * by the bNumEndpoints field. */
+ const struct libusb_endpoint_descriptor *endpoint;
+
+ /** Extra descriptors. If libusb encounters unknown interface descriptors,
+ * it will store them here, should you wish to parse them. */
+ const unsigned char *extra;
+
+ /** Length of the extra descriptors, in bytes. */
+ int extra_length;
+};
+
+/** \ingroup desc
+ * A collection of alternate settings for a particular USB interface.
+ */
+struct libusb_interface {
+ /** Array of interface descriptors. The length of this array is determined
+ * by the num_altsetting field. */
+ const struct libusb_interface_descriptor *altsetting;
+
+ /** The number of alternate settings that belong to this interface */
+ int num_altsetting;
+};
+
+/** \ingroup desc
+ * A structure representing the standard USB configuration descriptor. This
+ * descriptor is documented in section 9.6.3 of the USB 2.0 specification.
+ * All multiple-byte fields are represented in host-endian format.
+ */
+struct libusb_config_descriptor {
+ /** Size of this descriptor (in bytes) */
+ uint8_t bLength;
+
+ /** Descriptor type. Will have value
+ * \ref libusb_descriptor_type::LIBUSB_DT_CONFIG LIBUSB_DT_CONFIG
+ * in this context. */
+ uint8_t bDescriptorType;
+
+ /** Total length of data returned for this configuration */
+ uint16_t wTotalLength;
+
+ /** Number of interfaces supported by this configuration */
+ uint8_t bNumInterfaces;
+
+ /** Identifier value for this configuration */
+ uint8_t bConfigurationValue;
+
+ /** Index of string descriptor describing this configuration */
+ uint8_t iConfiguration;
+
+ /** Configuration characteristics */
+ uint8_t bmAttributes;
+
+ /** Maximum power consumption of the USB device from this bus in this
+ * configuration when the device is fully opreation. Expressed in units
+ * of 2 mA. */
+ uint8_t MaxPower;
+
+ /** Array of interfaces supported by this configuration. The length of
+ * this array is determined by the bNumInterfaces field. */
+ const struct libusb_interface *interface;
+
+ /** Extra descriptors. If libusb encounters unknown configuration
+ * descriptors, it will store them here, should you wish to parse them. */
+ const unsigned char *extra;
+
+ /** Length of the extra descriptors, in bytes. */
+ int extra_length;
+};
+
+/** \ingroup asyncio
+ * Setup packet for control transfers. */
+struct libusb_control_setup {
+ /** Request type. Bits 0:4 determine recipient, see
+ * \ref libusb_request_recipient. Bits 5:6 determine type, see
+ * \ref libusb_request_type. Bit 7 determines data transfer direction, see
+ * \ref libusb_endpoint_direction.
+ */
+ uint8_t bmRequestType;
+
+ /** Request. If the type bits of bmRequestType are equal to
+ * \ref libusb_request_type::LIBUSB_REQUEST_TYPE_STANDARD
+ * "LIBUSB_REQUEST_TYPE_STANDARD" then this field refers to
+ * \ref libusb_standard_request. For other cases, use of this field is
+ * application-specific. */
+ uint8_t bRequest;
+
+ /** Value. Varies according to request */
+ uint16_t wValue;
+
+ /** Index. Varies according to request, typically used to pass an index
+ * or offset */
+ uint16_t wIndex;
+
+ /** Number of bytes to transfer */
+ uint16_t wLength;
+};
+
+#define LIBUSB_CONTROL_SETUP_SIZE (sizeof(struct libusb_control_setup))
+
+/* libusb */
+
+struct libusb_context;
+struct libusb_device;
+struct libusb_device_handle;
+
+/** \ingroup lib
+ * Structure representing a libusb session. The concept of individual libusb
+ * sessions allows for your program to use two libraries (or dynamically
+ * load two modules) which both independently use libusb. This will prevent
+ * interference between the individual libusb users - for example
+ * libusb_set_debug() will not affect the other user of the library, and
+ * libusb_exit() will not destroy resources that the other user is still
+ * using.
+ *
+ * Sessions are created by libusb_init() and destroyed through libusb_exit().
+ * If your application is guaranteed to only ever include a single libusb
+ * user (i.e. you), you do not have to worry about contexts: pass NULL in
+ * every function call where a context is required. The default context
+ * will be used.
+ *
+ * For more information, see \ref contexts.
+ */
+typedef struct libusb_context libusb_context;
+
+/** \ingroup dev
+ * Structure representing a USB device detected on the system. This is an
+ * opaque type for which you are only ever provided with a pointer, usually
+ * originating from libusb_get_device_list().
+ *
+ * Certain operations can be performed on a device, but in order to do any
+ * I/O you will have to first obtain a device handle using libusb_open().
+ *
+ * Devices are reference counted with libusb_device_ref() and
+ * libusb_device_unref(), and are freed when the reference count reaches 0.
+ * New devices presented by libusb_get_device_list() have a reference count of
+ * 1, and libusb_free_device_list() can optionally decrease the reference count
+ * on all devices in the list. libusb_open() adds another reference which is
+ * later destroyed by libusb_close().
+ */
+typedef struct libusb_device libusb_device;
+
+
+/** \ingroup dev
+ * Structure representing a handle on a USB device. This is an opaque type for
+ * which you are only ever provided with a pointer, usually originating from
+ * libusb_open().
+ *
+ * A device handle is used to perform I/O and other operations. When finished
+ * with a device handle, you should call libusb_close().
+ */
+typedef struct libusb_device_handle libusb_device_handle;
+
+/** \ingroup misc
+ * Error codes. Most libusb functions return 0 on success or one of these
+ * codes on failure.
+ */
+enum libusb_error {
+ /** Success (no error) */
+ LIBUSB_SUCCESS = 0,
+
+ /** Input/output error */
+ LIBUSB_ERROR_IO = -1,
+
+ /** Invalid parameter */
+ LIBUSB_ERROR_INVALID_PARAM = -2,
+
+ /** Access denied (insufficient permissions) */
+ LIBUSB_ERROR_ACCESS = -3,
+
+ /** No such device (it may have been disconnected) */
+ LIBUSB_ERROR_NO_DEVICE = -4,
+
+ /** Entity not found */
+ LIBUSB_ERROR_NOT_FOUND = -5,
+
+ /** Resource busy */
+ LIBUSB_ERROR_BUSY = -6,
+
+ /** Operation timed out */
+ LIBUSB_ERROR_TIMEOUT = -7,
+
+ /** Overflow */
+ LIBUSB_ERROR_OVERFLOW = -8,
+
+ /** Pipe error */
+ LIBUSB_ERROR_PIPE = -9,
+
+ /** System call interrupted (perhaps due to signal) */
+ LIBUSB_ERROR_INTERRUPTED = -10,
+
+ /** Insufficient memory */
+ LIBUSB_ERROR_NO_MEM = -11,
+
+ /** Operation not supported or unimplemented on this platform */
+ LIBUSB_ERROR_NOT_SUPPORTED = -12,
+
+ /** Other error */
+ LIBUSB_ERROR_OTHER = -99
+};
+
+/** \ingroup asyncio
+ * Transfer status codes */
+enum libusb_transfer_status {
+ /** Transfer completed without error. Note that this does not indicate
+ * that the entire amount of requested data was transferred. */
+ LIBUSB_TRANSFER_COMPLETED,
+
+ /** Transfer failed */
+ LIBUSB_TRANSFER_ERROR,
+
+ /** Transfer timed out */
+ LIBUSB_TRANSFER_TIMED_OUT,
+
+ /** Transfer was cancelled */
+ LIBUSB_TRANSFER_CANCELLED,
+
+ /** For bulk/interrupt endpoints: halt condition detected (endpoint
+ * stalled). For control endpoints: control request not supported. */
+ LIBUSB_TRANSFER_STALL,
+
+ /** Device was disconnected */
+ LIBUSB_TRANSFER_NO_DEVICE,
+
+ /** Device sent more data than requested */
+ LIBUSB_TRANSFER_OVERFLOW
+};
+
+/** \ingroup asyncio
+ * libusb_transfer.flags values */
+enum libusb_transfer_flags {
+ /** Report short frames as errors */
+ LIBUSB_TRANSFER_SHORT_NOT_OK = 1<<0,
+
+ /** Automatically free() transfer buffer during libusb_free_transfer() */
+ LIBUSB_TRANSFER_FREE_BUFFER = 1<<1,
+
+ /** Automatically call libusb_free_transfer() after callback returns.
+ * If this flag is set, it is illegal to call libusb_free_transfer()
+ * from your transfer callback, as this will result in a double-free
+ * when this flag is acted upon. */
+ LIBUSB_TRANSFER_FREE_TRANSFER = 1<<2
+};
+
+/** \ingroup asyncio
+ * Isochronous packet descriptor. */
+struct libusb_iso_packet_descriptor {
+ /** Length of data to request in this packet */
+ unsigned int length;
+
+ /** Amount of data that was actually transferred */
+ unsigned int actual_length;
+
+ /** Status code for this packet */
+ enum libusb_transfer_status status;
+};
+
+struct libusb_transfer;
+
+/** \ingroup asyncio
+ * Asynchronous transfer callback function type. When submitting asynchronous
+ * transfers, you pass a pointer to a callback function of this type via the
+ * \ref libusb_transfer::callback "callback" member of the libusb_transfer
+ * structure. libusb will call this function later, when the transfer has
+ * completed or failed. See \ref asyncio for more information.
+ * \param transfer The libusb_transfer struct the callback function is being
+ * notified about.
+ */
+typedef void (*libusb_transfer_cb_fn)(struct libusb_transfer *transfer);
+
+/** \ingroup asyncio
+ * The generic USB transfer structure. The user populates this structure and
+ * then submits it in order to request a transfer. After the transfer has
+ * completed, the library populates the transfer with the results and passes
+ * it back to the user.
+ */
+struct libusb_transfer {
+ /** Handle of the device that this transfer will be submitted to */
+ libusb_device_handle *dev_handle;
+
+ /** A bitwise OR combination of \ref libusb_transfer_flags. */
+ uint8_t flags;
+
+ /** Address of the endpoint where this transfer will be sent. */
+ unsigned char endpoint;
+
+ /** Type of the endpoint from \ref libusb_transfer_type */
+ unsigned char type;
+
+ /** Timeout for this transfer in millseconds. A value of 0 indicates no
+ * timeout. */
+ unsigned int timeout;
+
+ /** The status of the transfer. Read-only, and only for use within
+ * transfer callback function.
+ *
+ * If this is an isochronous transfer, this field may read COMPLETED even
+ * if there were errors in the frames. Use the
+ * \ref libusb_iso_packet_descriptor::status "status" field in each packet
+ * to determine if errors occurred. */
+ enum libusb_transfer_status status;
+
+ /** Length of the data buffer */
+ int length;
+
+ /** Actual length of data that was transferred. Read-only, and only for
+ * use within transfer callback function. Not valid for isochronous
+ * endpoint transfers. */
+ int actual_length;
+
+ /** Callback function. This will be invoked when the transfer completes,
+ * fails, or is cancelled. */
+ libusb_transfer_cb_fn callback;
+
+ /** User context data to pass to the callback function. */
+ void *user_data;
+
+ /** Data buffer */
+ unsigned char *buffer;
+
+ /** Number of isochronous packets. Only used for I/O with isochronous
+ * endpoints. */
+ int num_iso_packets;
+
+ /** Isochronous packet descriptors, for isochronous transfers only. */
+ struct libusb_iso_packet_descriptor iso_packet_desc
+#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
+ [] /* valid C99 code */
+#else
+ [0] /* non-standard, but usually working code */
+#endif
+ ;
+};
+
+int libusb_init(libusb_context **ctx);
+void libusb_exit(libusb_context *ctx);
+void libusb_set_debug(libusb_context *ctx, int level);
+
+ssize_t libusb_get_device_list(libusb_context *ctx,
+ libusb_device ***list);
+void libusb_free_device_list(libusb_device **list, int unref_devices);
+libusb_device *libusb_ref_device(libusb_device *dev);
+void libusb_unref_device(libusb_device *dev);
+
+int libusb_get_configuration(libusb_device_handle *dev, int *config);
+int libusb_get_device_descriptor(libusb_device *dev,
+ struct libusb_device_descriptor *desc);
+int libusb_get_active_config_descriptor(libusb_device *dev,
+ struct libusb_config_descriptor **config);
+int libusb_get_config_descriptor(libusb_device *dev, uint8_t config_index,
+ struct libusb_config_descriptor **config);
+int libusb_get_config_descriptor_by_value(libusb_device *dev,
+ uint8_t bConfigurationValue, struct libusb_config_descriptor **config);
+void libusb_free_config_descriptor(struct libusb_config_descriptor *config);
+uint8_t libusb_get_bus_number(libusb_device *dev);
+uint8_t libusb_get_device_address(libusb_device *dev);
+int libusb_get_max_packet_size(libusb_device *dev, unsigned char endpoint);
+
+int libusb_open(libusb_device *dev, libusb_device_handle **handle);
+void libusb_close(libusb_device_handle *dev_handle);
+libusb_device *libusb_get_device(libusb_device_handle *dev_handle);
+
+int libusb_set_configuration(libusb_device_handle *dev, int configuration);
+int libusb_claim_interface(libusb_device_handle *dev, int iface);
+int libusb_release_interface(libusb_device_handle *dev, int iface);
+
+libusb_device_handle *libusb_open_device_with_vid_pid(libusb_context *ctx,
+ uint16_t vendor_id, uint16_t product_id);
+
+int libusb_set_interface_alt_setting(libusb_device_handle *dev,
+ int interface_number, int alternate_setting);
+int libusb_clear_halt(libusb_device_handle *dev, unsigned char endpoint);
+int libusb_reset_device(libusb_device_handle *dev);
+
+int libusb_kernel_driver_active(libusb_device_handle *dev, int interface);
+int libusb_detach_kernel_driver(libusb_device_handle *dev, int interface);
+int libusb_attach_kernel_driver(libusb_device_handle *dev, int interface);
+
+/* async I/O */
+
+/** \ingroup asyncio
+ * Get the data section of a control transfer. This convenience function is here
+ * to remind you that the data does not start until 8 bytes into the actual
+ * buffer, as the setup packet comes first.
+ *
+ * Calling this function only makes sense from a transfer callback function,
+ * or situations where you have already allocated a suitably sized buffer at
+ * transfer->buffer.
+ *
+ * \param transfer a transfer
+ * \returns pointer to the first byte of the data section
+ */
+static inline unsigned char *libusb_control_transfer_get_data(
+ struct libusb_transfer *transfer)
+{
+ return transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
+}
+
+/** \ingroup asyncio
+ * Get the control setup packet of a control transfer. This convenience
+ * function is here to remind you that the control setup occupies the first
+ * 8 bytes of the transfer data buffer.
+ *
+ * Calling this function only makes sense from a transfer callback function,
+ * or situations where you have already allocated a suitably sized buffer at
+ * transfer->buffer.
+ *
+ * \param transfer a transfer
+ * \returns a casted pointer to the start of the transfer data buffer
+ */
+static inline struct libusb_control_setup *libusb_control_transfer_get_setup(
+ struct libusb_transfer *transfer)
+{
+ return (struct libusb_control_setup *) transfer->buffer;
+}
+
+/** \ingroup asyncio
+ * Helper function to populate the setup packet (first 8 bytes of the data
+ * buffer) for a control transfer. The wIndex, wValue and wLength values should
+ * be given in host-endian byte order.
+ *
+ * \param buffer buffer to output the setup packet into
+ * \param bmRequestType see the
+ * \ref libusb_control_setup::bmRequestType "bmRequestType" field of
+ * \ref libusb_control_setup
+ * \param bRequest see the
+ * \ref libusb_control_setup::bRequest "bRequest" field of
+ * \ref libusb_control_setup
+ * \param wValue see the
+ * \ref libusb_control_setup::wValue "wValue" field of
+ * \ref libusb_control_setup
+ * \param wIndex see the
+ * \ref libusb_control_setup::wIndex "wIndex" field of
+ * \ref libusb_control_setup
+ * \param wLength see the
+ * \ref libusb_control_setup::wLength "wLength" field of
+ * \ref libusb_control_setup
+ */
+static inline void libusb_fill_control_setup(unsigned char *buffer,
+ uint8_t bmRequestType, uint8_t bRequest, uint16_t wValue, uint16_t wIndex,
+ uint16_t wLength)
+{
+ struct libusb_control_setup *setup = (struct libusb_control_setup *) buffer;
+ setup->bmRequestType = bmRequestType;
+ setup->bRequest = bRequest;
+ setup->wValue = libusb_cpu_to_le16(wValue);
+ setup->wIndex = libusb_cpu_to_le16(wIndex);
+ setup->wLength = libusb_cpu_to_le16(wLength);
+}
+
+struct libusb_transfer *libusb_alloc_transfer(int iso_packets);
+int libusb_submit_transfer(struct libusb_transfer *transfer);
+int libusb_cancel_transfer(struct libusb_transfer *transfer);
+void libusb_free_transfer(struct libusb_transfer *transfer);
+
+/** \ingroup asyncio
+ * Helper function to populate the required \ref libusb_transfer fields
+ * for a control transfer.
+ *
+ * If you pass a transfer buffer to this function, the first 8 bytes will
+ * be interpreted as a control setup packet, and the wLength field will be
+ * used to automatically populate the \ref libusb_transfer::length "length"
+ * field of the transfer. Therefore the recommended approach is:
+ * -# Allocate a suitably sized data buffer (including space for control setup)
+ * -# Call libusb_fill_control_setup()
+ * -# If this is a host-to-device transfer with a data stage, put the data
+ * in place after the setup packet
+ * -# Call this function
+ * -# Call libusb_submit_transfer()
+ *
+ * It is also legal to pass a NULL buffer to this function, in which case this
+ * function will not attempt to populate the length field. Remember that you
+ * must then populate the buffer and length fields later.
+ *
+ * \param transfer the transfer to populate
+ * \param dev_handle handle of the device that will handle the transfer
+ * \param buffer data buffer. If provided, this function will interpret the
+ * first 8 bytes as a setup packet and infer the transfer length from that.
+ * \param callback callback function to be invoked on transfer completion
+ * \param user_data user data to pass to callback function
+ * \param timeout timeout for the transfer in milliseconds
+ */
+static inline void libusb_fill_control_transfer(
+ struct libusb_transfer *transfer, libusb_device_handle *dev_handle,
+ unsigned char *buffer, libusb_transfer_cb_fn callback, void *user_data,
+ unsigned int timeout)
+{
+ struct libusb_control_setup *setup = (struct libusb_control_setup *) buffer;
+ transfer->dev_handle = dev_handle;
+ transfer->endpoint = 0;
+ transfer->type = LIBUSB_TRANSFER_TYPE_CONTROL;
+ transfer->timeout = timeout;
+ transfer->buffer = buffer;
+ if (setup)
+ transfer->length = LIBUSB_CONTROL_SETUP_SIZE
+ + libusb_le16_to_cpu(setup->wLength);
+ transfer->user_data = user_data;
+ transfer->callback = callback;
+}
+
+/** \ingroup asyncio
+ * Helper function to populate the required \ref libusb_transfer fields
+ * for a bulk transfer.
+ *
+ * \param transfer the transfer to populate
+ * \param dev_handle handle of the device that will handle the transfer
+ * \param endpoint address of the endpoint where this transfer will be sent
+ * \param buffer data buffer
+ * \param length length of data buffer
+ * \param callback callback function to be invoked on transfer completion
+ * \param user_data user data to pass to callback function
+ * \param timeout timeout for the transfer in milliseconds
+ */
+static inline void libusb_fill_bulk_transfer(struct libusb_transfer *transfer,
+ libusb_device_handle *dev_handle, unsigned char endpoint,
+ unsigned char *buffer, int length, libusb_transfer_cb_fn callback,
+ void *user_data, unsigned int timeout)
+{
+ transfer->dev_handle = dev_handle;
+ transfer->endpoint = endpoint;
+ transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
+ transfer->timeout = timeout;
+ transfer->buffer = buffer;
+ transfer->length = length;
+ transfer->user_data = user_data;
+ transfer->callback = callback;
+}
+
+/** \ingroup asyncio
+ * Helper function to populate the required \ref libusb_transfer fields
+ * for an interrupt transfer.
+ *
+ * \param transfer the transfer to populate
+ * \param dev_handle handle of the device that will handle the transfer
+ * \param endpoint address of the endpoint where this transfer will be sent
+ * \param buffer data buffer
+ * \param length length of data buffer
+ * \param callback callback function to be invoked on transfer completion
+ * \param user_data user data to pass to callback function
+ * \param timeout timeout for the transfer in milliseconds
+ */
+static inline void libusb_fill_interrupt_transfer(
+ struct libusb_transfer *transfer, libusb_device_handle *dev_handle,
+ unsigned char endpoint, unsigned char *buffer, int length,
+ libusb_transfer_cb_fn callback, void *user_data, unsigned int timeout)
+{
+ transfer->dev_handle = dev_handle;
+ transfer->endpoint = endpoint;
+ transfer->type = LIBUSB_TRANSFER_TYPE_INTERRUPT;
+ transfer->timeout = timeout;
+ transfer->buffer = buffer;
+ transfer->length = length;
+ transfer->user_data = user_data;
+ transfer->callback = callback;
+}
+
+/** \ingroup asyncio
+ * Helper function to populate the required \ref libusb_transfer fields
+ * for an isochronous transfer.
+ *
+ * \param transfer the transfer to populate
+ * \param dev_handle handle of the device that will handle the transfer
+ * \param endpoint address of the endpoint where this transfer will be sent
+ * \param buffer data buffer
+ * \param length length of data buffer
+ * \param num_iso_packets the number of isochronous packets
+ * \param callback callback function to be invoked on transfer completion
+ * \param user_data user data to pass to callback function
+ * \param timeout timeout for the transfer in milliseconds
+ */
+static inline void libusb_fill_iso_transfer(struct libusb_transfer *transfer,
+ libusb_device_handle *dev_handle, unsigned char endpoint,
+ unsigned char *buffer, int length, int num_iso_packets,
+ libusb_transfer_cb_fn callback, void *user_data, unsigned int timeout)
+{
+ transfer->dev_handle = dev_handle;
+ transfer->endpoint = endpoint;
+ transfer->type = LIBUSB_TRANSFER_TYPE_ISOCHRONOUS;
+ transfer->timeout = timeout;
+ transfer->buffer = buffer;
+ transfer->length = length;
+ transfer->num_iso_packets = num_iso_packets;
+ transfer->user_data = user_data;
+ transfer->callback = callback;
+}
+
+/** \ingroup asyncio
+ * Convenience function to set the length of all packets in an isochronous
+ * transfer, based on the num_iso_packets field in the transfer structure.
+ *
+ * \param transfer a transfer
+ * \param length the length to set in each isochronous packet descriptor
+ * \see libusb_get_max_packet_size()
+ */
+static inline void libusb_set_iso_packet_lengths(
+ struct libusb_transfer *transfer, unsigned int length)
+{
+ int i;
+ for (i = 0; i < transfer->num_iso_packets; i++)
+ transfer->iso_packet_desc[i].length = length;
+}
+
+/** \ingroup asyncio
+ * Convenience function to locate the position of an isochronous packet
+ * within the buffer of an isochronous transfer.
+ *
+ * This is a thorough function which loops through all preceding packets,
+ * accumulating their lengths to find the position of the specified packet.
+ * Typically you will assign equal lengths to each packet in the transfer,
+ * and hence the above method is sub-optimal. You may wish to use
+ * libusb_get_iso_packet_buffer_simple() instead.
+ *
+ * \param transfer a transfer
+ * \param packet the packet to return the address of
+ * \returns the base address of the packet buffer inside the transfer buffer,
+ * or NULL if the packet does not exist.
+ * \see libusb_get_iso_packet_buffer_simple()
+ */
+static inline unsigned char *libusb_get_iso_packet_buffer(
+ struct libusb_transfer *transfer, unsigned int packet)
+{
+ int i;
+ size_t offset = 0;
+ int _packet;
+
+ /* oops..slight bug in the API. packet is an unsigned int, but we use
+ * signed integers almost everywhere else. range-check and convert to
+ * signed to avoid compiler warnings. FIXME for libusb-2. */
+ if (packet > INT_MAX)
+ return NULL;
+ _packet = packet;
+
+ if (_packet >= transfer->num_iso_packets)
+ return NULL;
+
+ for (i = 0; i < _packet; i++)
+ offset += transfer->iso_packet_desc[i].length;
+
+ return transfer->buffer + offset;
+}
+
+/** \ingroup asyncio
+ * Convenience function to locate the position of an isochronous packet
+ * within the buffer of an isochronous transfer, for transfers where each
+ * packet is of identical size.
+ *
+ * This function relies on the assumption that every packet within the transfer
+ * is of identical size to the first packet. Calculating the location of
+ * the packet buffer is then just a simple calculation:
+ * buffer + (packet_size * packet)
+ *
+ * Do not use this function on transfers other than those that have identical
+ * packet lengths for each packet.
+ *
+ * \param transfer a transfer
+ * \param packet the packet to return the address of
+ * \returns the base address of the packet buffer inside the transfer buffer,
+ * or NULL if the packet does not exist.
+ * \see libusb_get_iso_packet_buffer()
+ */
+static inline unsigned char *libusb_get_iso_packet_buffer_simple(
+ struct libusb_transfer *transfer, unsigned int packet)
+{
+ int _packet;
+
+ /* oops..slight bug in the API. packet is an unsigned int, but we use
+ * signed integers almost everywhere else. range-check and convert to
+ * signed to avoid compiler warnings. FIXME for libusb-2. */
+ if (packet > INT_MAX)
+ return NULL;
+ _packet = packet;
+
+ if (_packet >= transfer->num_iso_packets)
+ return NULL;
+
+ return transfer->buffer + (transfer->iso_packet_desc[0].length * _packet);
+}
+
+/* sync I/O */
+
+int libusb_control_transfer(libusb_device_handle *dev_handle,
+ uint8_t request_type, uint8_t request, uint16_t value, uint16_t index,
+ unsigned char *data, uint16_t length, unsigned int timeout);
+
+int libusb_bulk_transfer(libusb_device_handle *dev_handle,
+ unsigned char endpoint, unsigned char *data, int length,
+ int *actual_length, unsigned int timeout);
+
+int libusb_interrupt_transfer(libusb_device_handle *dev_handle,
+ unsigned char endpoint, unsigned char *data, int length,
+ int *actual_length, unsigned int timeout);
+
+/** \ingroup desc
+ * Retrieve a descriptor from the default control pipe.
+ * This is a convenience function which formulates the appropriate control
+ * message to retrieve the descriptor.
+ *
+ * \param dev a device handle
+ * \param desc_type the descriptor type, see \ref libusb_descriptor_type
+ * \param desc_index the index of the descriptor to retrieve
+ * \param data output buffer for descriptor
+ * \param length size of data buffer
+ * \returns number of bytes returned in data, or LIBUSB_ERROR code on failure
+ */
+static inline int libusb_get_descriptor(libusb_device_handle *dev,
+ uint8_t desc_type, uint8_t desc_index, unsigned char *data, int length)
+{
+ return libusb_control_transfer(dev, LIBUSB_ENDPOINT_IN,
+ LIBUSB_REQUEST_GET_DESCRIPTOR, (desc_type << 8) | desc_index, 0, data,
+ length, 1000);
+}
+
+/** \ingroup desc
+ * Retrieve a descriptor from a device.
+ * This is a convenience function which formulates the appropriate control
+ * message to retrieve the descriptor. The string returned is Unicode, as
+ * detailed in the USB specifications.
+ *
+ * \param dev a device handle
+ * \param desc_index the index of the descriptor to retrieve
+ * \param langid the language ID for the string descriptor
+ * \param data output buffer for descriptor
+ * \param length size of data buffer
+ * \returns number of bytes returned in data, or LIBUSB_ERROR code on failure
+ * \see libusb_get_string_descriptor_ascii()
+ */
+static inline int libusb_get_string_descriptor(libusb_device_handle *dev,
+ uint8_t desc_index, uint16_t langid, unsigned char *data, int length)
+{
+ return libusb_control_transfer(dev, LIBUSB_ENDPOINT_IN,
+ LIBUSB_REQUEST_GET_DESCRIPTOR, (LIBUSB_DT_STRING << 8) | desc_index,
+ langid, data, length, 1000);
+}
+
+int libusb_get_string_descriptor_ascii(libusb_device_handle *dev,
+ uint8_t index, unsigned char *data, int length);
+
+/* polling and timeouts */
+
+int libusb_try_lock_events(libusb_context *ctx);
+void libusb_lock_events(libusb_context *ctx);
+void libusb_unlock_events(libusb_context *ctx);
+int libusb_event_handling_ok(libusb_context *ctx);
+int libusb_event_handler_active(libusb_context *ctx);
+void libusb_lock_event_waiters(libusb_context *ctx);
+void libusb_unlock_event_waiters(libusb_context *ctx);
+int libusb_wait_for_event(libusb_context *ctx, struct timeval *tv);
+
+int libusb_handle_events_timeout(libusb_context *ctx, struct timeval *tv);
+int libusb_handle_events(libusb_context *ctx);
+int libusb_handle_events_locked(libusb_context *ctx, struct timeval *tv);
+int libusb_get_next_timeout(libusb_context *ctx, struct timeval *tv);
+
+/** \ingroup poll
+ * File descriptor for polling
+ */
+struct libusb_pollfd {
+ /** Numeric file descriptor */
+ int fd;
+
+ /** Event flags to poll for from . POLLIN indicates that you
+ * should monitor this file descriptor for becoming ready to read from,
+ * and POLLOUT indicates that you should monitor this file descriptor for
+ * nonblocking write readiness. */
+ short events;
+};
+
+/** \ingroup poll
+ * Callback function, invoked when a new file descriptor should be added
+ * to the set of file descriptors monitored for events.
+ * \param fd the new file descriptor
+ * \param events events to monitor for, see \ref libusb_pollfd for a
+ * description
+ * \param user_data User data pointer specified in
+ * libusb_set_pollfd_notifiers() call
+ * \see libusb_set_pollfd_notifiers()
+ */
+typedef void (*libusb_pollfd_added_cb)(int fd, short events, void *user_data);
+
+/** \ingroup poll
+ * Callback function, invoked when a file descriptor should be removed from
+ * the set of file descriptors being monitored for events. After returning
+ * from this callback, do not use that file descriptor again.
+ * \param fd the file descriptor to stop monitoring
+ * \param user_data User data pointer specified in
+ * libusb_set_pollfd_notifiers() call
+ * \see libusb_set_pollfd_notifiers()
+ */
+typedef void (*libusb_pollfd_removed_cb)(int fd, void *user_data);
+
+const struct libusb_pollfd **libusb_get_pollfds(libusb_context *ctx);
+void libusb_set_pollfd_notifiers(libusb_context *ctx,
+ libusb_pollfd_added_cb added_cb, libusb_pollfd_removed_cb removed_cb,
+ void *user_data);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/host_usb_mixer_control/OSX/usb_mixer.cpp b/host_usb_mixer_control/OSX/usb_mixer.cpp
new file mode 100644
index 00000000..b678a7ed
--- /dev/null
+++ b/host_usb_mixer_control/OSX/usb_mixer.cpp
@@ -0,0 +1,942 @@
+// Copyright 2022-2023 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+#include
+#include
+#include
+#include "usb_mixer.h"
+#include "libusb.h"
+
+/* Note: this is all quite generic and could be simplified ALOT for a specific design */
+
+// TODO we dont really need to store mixer input strings
+// Currently res, max, min dont get populated
+
+#define XMOS_VID 0x20b1
+uint16_t XMOS_PID[] = {
+ 0x0002, //L1_AUDIO2
+ 0x0003, //L1_AUDIO1
+ 0x0004, //L2_AUDIO2
+ 0x000E, //xk_216_AUDIO2
+ 0x000F, //xk_216_AUDIO1
+ 0x0016, //xk_316_AUDIO2
+ 0x0017, //xk_316_AUDIO1
+};
+
+#define USB_REQUEST_TO_DEV 0x21 /* D7 Data direction: 0 (Host to device)
+ * D6:5 Type: 01 (Class)
+ * D4:0 Receipient: 1 (Interface) */
+#define USB_REQUEST_FROM_DEV 0xa1
+
+#define USB_CS_INTERFACE 0x24
+#define USB_INPUT_TERM_TYPE 0x02
+#define USB_MIXER_UNIT_TYPE 0x04
+#define USB_FEATURE_UNIT_TYPE 0x06
+
+#define INPUT_TERMINAL USB_INPUT_TERM_TYPE
+#define EXTENSION_UNIT 0x9
+#define CS_INTERFACE USB_CS_INTERFACE
+#define FEATURE_UNIT 0x06
+
+#define CS_XU_SEL 0x6
+#define MU_MIXER_CONTROL 0x1
+
+// Output from PC
+#define USB_STREAMING 0x01
+// Input to device
+//#define MICROPHONE 0x02
+
+#define ID_XU_OUT 51
+#define ID_XU_IN 52
+
+#define OFFSET_BLENGTH 0
+#define OFFSET_BDESCRIPTORTYPE 1
+#define OFFSET_BDESCRIPTORSUBTYPE 2
+#define OFFSET_BUNITID 3
+
+#define OFFSET_FU_BSOURCEID 4
+
+#define OFFSET_XU_BNRINPINS 6
+#define OFFSET_XU_BSOURCEID 7
+
+#define OFFSET_IT_WTERMINALTYPE 5
+#define OFFSET_IT_BNRCHANNELS 8
+#define OFFSET_IT_ICHANNELNAMES 13
+
+typedef struct
+{
+ double min;
+ double max;
+ double res;
+ double weight;
+} mixer_node;
+
+typedef struct
+{
+ unsigned int id;
+ unsigned int num_inputs;
+ char input_names[USB_MIXER_INPUTS][USB_MIXER_MAX_NAME_LEN]; /* Current mixer input names -
+ * we dont really need to store these */
+ int input_connections[USB_MIXER_INPUTS];
+ unsigned int num_outputs;
+ char output_names[USB_MIXER_INPUTS][USB_MIXER_MAX_NAME_LEN];
+ unsigned int num_inPins;
+ mixer_node nodes[USB_MIXER_INPUTS * USB_MIXER_OUTPUTS];
+} usb_mixer_device;
+
+typedef struct {
+ int cur;
+ int default_value;
+ char name[USB_MIXER_MAX_NAME_LEN];
+ enum usb_chan_type ctype;
+}channel_map_node;
+
+typedef struct {
+ int numInputs;
+ int numOutputs;
+ channel_map_node map[USB_MAX_CHANNEL_MAP_SIZE];
+}channel_mapp;
+
+typedef struct
+{
+ unsigned int id;
+ unsigned int numInputs;
+ char inputStrings[USB_MIXER_INPUTS*4][USB_MIXER_MAX_NAME_LEN]; /* Complete list of all possible inputs */
+ unsigned int numOutputs;
+ unsigned int state[USB_MIXER_INPUTS];
+} t_usb_mixSel;
+
+typedef struct {
+ unsigned int device_open;
+ unsigned int num_usb_mixers;
+ usb_mixer_device usb_mixer[USB_MIXERS];
+ t_usb_mixSel usb_mixSel[USB_MIXERS];
+
+ channel_mapp audChannelMap;
+ channel_mapp usbChannelMap;
+
+
+} usb_mixer_handle;
+
+static usb_mixer_handle *usb_mixers = NULL;
+
+static libusb_device_handle *devh = NULL;
+
+bool is_supported_device(uint16_t pid)
+{
+ for(uint16_t id : XMOS_PID)
+ {
+ if (pid == id) return true;
+ }
+ fprintf(stderr, "ERROR :: Device not supported\n");
+ return false;
+}
+
+/* Issue a generic control/class GET request to a specific unit in the Audio Interface */
+int usb_audio_class_get(unsigned char bRequest, unsigned char cs, unsigned char cn, unsigned short unitID, unsigned short wLength, unsigned char *data)
+{
+ return libusb_control_transfer(devh,
+ USB_REQUEST_FROM_DEV,
+ bRequest,
+ (cs<<8) | cn, /* wValue */
+ (unitID & 0xff) << 8 | 0x0,
+ data,
+ wLength,
+ 0);
+}
+
+/* Issue a generic control/class SET request to a specific unit in the Audio Interface */
+int usb_audio_class_set(unsigned char bRequest, unsigned char cs, unsigned char cn, unsigned short unitID, unsigned short wLength, unsigned char *data)
+{
+ return libusb_control_transfer(devh,
+ USB_REQUEST_TO_DEV,
+ bRequest,
+ (cs<<8) | cn, /* wValue */
+ (unitID & 0xff) << 8 | 0x0,
+ data,
+ wLength,
+ 0);
+}
+
+/* Note, this never get cached in an object since it can change on the device side */
+int usb_mixer_mem_get(unsigned int mixer, unsigned offset, unsigned char *data)
+{
+ return libusb_control_transfer(devh,
+ USB_REQUEST_FROM_DEV, /* nRequest */
+ MEM, /* bRequest */
+ offset, /* wValue */
+ (usb_mixers->usb_mixer[mixer].id & 0xff) << 8 | 0x0, /* wIndex */
+ data, 64, 0);
+}
+
+static const unsigned char *find_input_term_unit_by_id(const unsigned char *data, int length, int id)
+{
+ const unsigned char *interface_data = data;
+ while (length)
+ {
+ const unsigned char *interface_len = interface_data;
+ int sub_type = *(interface_len + 2);
+ if (sub_type == USB_INPUT_TERM_TYPE)
+ {
+ int unit_id = *(interface_len + 3);
+ if (unit_id == id)
+ {
+ return interface_len;
+ }
+ }
+ interface_data+=*interface_len;
+ length -= *interface_len;
+ }
+ return NULL;
+}
+
+static const unsigned char *find_connected_feature_unit_by_id(const unsigned char *data, int length, int id) {
+ const unsigned char *interface_data = data;
+ while (length)
+ {
+ const unsigned char *interface_len = interface_data;
+ int sub_type = *(interface_len + 2);
+ if (sub_type == USB_FEATURE_UNIT_TYPE) {
+ //int unit_id = *(interface_len + 3);
+ int src_unit_id = *(interface_len + 4);
+ if (src_unit_id == id) {
+ return interface_len;
+ }
+ }
+ interface_data+=*interface_len;
+ length -= *interface_len;
+ }
+ return NULL;
+}
+
+static const unsigned char *findUnit(const unsigned char *descs, int length, int id)
+{
+ const unsigned char *interface_data = descs;
+ while (length)
+ {
+ const unsigned char *interface_len = interface_data;
+ int bDescriptorType = *(interface_len + 1);
+ if (bDescriptorType == CS_INTERFACE)
+ {
+ int unit_id = *(interface_len + 3);
+ if (unit_id == id)
+ {
+ return interface_len;
+ }
+ }
+ interface_data+=*interface_len;
+ length -= *interface_len;
+ }
+ return NULL;
+}
+
+static int get_num_mixer_units(const unsigned char *data, int length) {
+ const unsigned char *interface_data = data;
+ int interface_len = length;
+ int num_mixer_units_found = 0;
+
+ while (interface_len) {
+ const unsigned char *interfaces = interface_data;
+ int interface_type = *(interfaces + 1);
+ int unit_type = *(interfaces + 2);
+ if (interface_type == USB_CS_INTERFACE && unit_type == USB_MIXER_UNIT_TYPE) {
+ num_mixer_units_found++;
+ }
+ interface_data+=*interfaces;
+ interface_len -= *interfaces;
+ }
+
+ return num_mixer_units_found;
+}
+
+static double dev_get_mixer_value(unsigned int mixer, unsigned int nodeId)
+{
+ // MU_MIXER_CONTROL 0x01
+ short data;
+ usb_audio_class_get(CUR, 0x01<<8, nodeId, usb_mixers->usb_mixer[mixer].id, 2,(unsigned char *) &data);
+ return ((double) data / 256);
+}
+
+/* Populates min, max, res */
+static unsigned short dev_get_mixer_range(unsigned int mixer, unsigned int channel,
+ double *min, double *max, double *res)
+{
+ short data[64];
+
+ short min2, max2, res2;
+
+ usb_audio_class_get(RANGE, MU_MIXER_CONTROL, channel, usb_mixers->usb_mixer[mixer].id, 8, (unsigned char *) data);
+
+ min2 = data[1];
+ max2 = data[2];
+ res2 = data[3];
+ //printf("%f, %f, %f\n", (double)min2/256, (double)max2/256, (double) res2/256);
+ *min = (double)min2/256;
+ *max = (double)max2/256;
+ *res = (double)res2/256;
+
+ return 0;
+}
+
+int dev_get_channel_map(int channel, int unitId)
+{
+ short data;
+ usb_audio_class_get(CUR, 0, channel, unitId, 2,(unsigned char *) &data);
+ return data;
+}
+
+static int dev_set_channel_map(int channel, int val, int unitId)
+{
+ short value = val;
+ usb_audio_class_set(CUR, 0, channel, unitId, 1, (unsigned char *)&value);
+ return 0;
+}
+
+static int mixer_update_all_nodes(unsigned int mixer_index)
+{
+ int i = 0;
+ int j = 0;
+ double min, max, res;
+
+ for (i = 0; i < usb_mixers->usb_mixer[mixer_index].num_inputs; i++)
+ {
+ for (j = 0; j < usb_mixers->usb_mixer[mixer_index].num_outputs; j++)
+ {
+ dev_get_mixer_range(mixer_index, (i*usb_mixers->usb_mixer[mixer_index].num_outputs)+j, &min, &max, &res);
+
+ usb_mixers->usb_mixer[mixer_index].nodes[(i*usb_mixers->usb_mixer[mixer_index].num_outputs)+j].min = min;
+ usb_mixers->usb_mixer[mixer_index].nodes[(i*usb_mixers->usb_mixer[mixer_index].num_outputs)+j].max = max;
+ usb_mixers->usb_mixer[mixer_index].nodes[(i*usb_mixers->usb_mixer[mixer_index].num_outputs)+j].res = res;
+ //printf("%f, %f, %f\n", min, max, res);
+
+ usb_mixers->usb_mixer[mixer_index].nodes[(i*usb_mixers->usb_mixer[mixer_index].num_outputs)+j].weight =
+ dev_get_mixer_value(mixer_index, (i*usb_mixers->usb_mixer[mixer_index].num_outputs)+j);
+ }
+ }
+ return 0;
+}
+
+/* Start at unit %id, find it in descs, keep recursively parsing up path(s) until get to Input Term and add strings */
+int addStrings(const unsigned char *data, int length, int mixer_index, int id, int chanCount)
+{
+ const unsigned char *currentUnitPtr = NULL;
+
+ /* Find this unit in the descs */
+ currentUnitPtr = findUnit(data, length, id);
+
+ if(currentUnitPtr != NULL)
+ {
+ /* Check if unit is a Input term */
+ if(*(currentUnitPtr+OFFSET_BDESCRIPTORSUBTYPE) == INPUT_TERMINAL)
+ {
+
+ /* Get channel names */
+#ifdef DEBUG
+ printf("Input terminal found on path (ID: %d): %d channels, total: %d\n",*(currentUnitPtr+OFFSET_BUNITID),
+ *(currentUnitPtr+OFFSET_IT_BNRCHANNELS), chanCount);
+#endif
+
+ int iChannelNames = *(currentUnitPtr+OFFSET_IT_ICHANNELNAMES);
+ int wTerminalType = *(currentUnitPtr+OFFSET_IT_WTERMINALTYPE);
+
+#ifdef DEBUG
+ printf("iChannelNames: %d wTerminalType: %d\n", iChannelNames, wTerminalType);
+
+ printf("Channels found:\n");
+
+#endif
+ for(int i = 0; i < *(currentUnitPtr+OFFSET_IT_BNRCHANNELS); i++)
+ {
+ unsigned char mixer_input_name[USB_MIXER_MAX_NAME_LEN];
+ memset(mixer_input_name, 0 ,USB_MIXER_MAX_NAME_LEN);
+ if (wTerminalType == 1)
+ {
+ strcpy(usb_mixers->usb_mixSel[mixer_index].inputStrings[chanCount], "DAW - ");
+
+ //usb_mixers->channel_maps[usb_mixers->num_channel_maps].ctype = (enum usb_chan_type) USB_CHAN_OUT;
+
+ usb_mixers->audChannelMap.numOutputs = usb_mixers->audChannelMap.numOutputs +1;
+
+ usb_mixers->audChannelMap.map[usb_mixers->audChannelMap.numInputs].ctype = (enum usb_chan_type) USB_CHAN_OUT;
+ usb_mixers->usbChannelMap.map[usb_mixers->usbChannelMap.numInputs].ctype = (enum usb_chan_type) USB_CHAN_OUT;
+
+ }
+ else
+ {
+ strcpy(usb_mixers->usb_mixSel[mixer_index].inputStrings[chanCount], "AUD - ");
+
+ //usb_mixers->channel_maps[usb_mixers->num_channel_maps].ctype = (enum usb_chan_type) USB_CHAN_IN;
+
+ usb_mixers->audChannelMap.map[usb_mixers->audChannelMap.numInputs].ctype = (enum usb_chan_type) USB_CHAN_IN;
+ usb_mixers->usbChannelMap.map[usb_mixers->usbChannelMap.numInputs].ctype = (enum usb_chan_type) USB_CHAN_IN;
+
+
+ usb_mixers->usbChannelMap.numOutputs = usb_mixers->usbChannelMap.numOutputs +1;
+ }
+ /* Get relevant string descriptor */
+ libusb_get_string_descriptor_ascii(devh, iChannelNames+i, mixer_input_name,
+ USB_MIXER_MAX_NAME_LEN - strlen(usb_mixers->usb_mixSel[mixer_index].inputStrings[chanCount]));
+
+ strcat(usb_mixers->usb_mixSel[mixer_index].inputStrings[chanCount], (char *)mixer_input_name);
+
+ /* Add to channel mappers also */
+ //strcat(usb_mixers->channel_maps[usb_mixers->num_channel_maps].name, (char *)mixer_input_name);
+ strcat(usb_mixers->audChannelMap.map[usb_mixers->audChannelMap.numInputs ].name, (char *)mixer_input_name);
+ strcat(usb_mixers->usbChannelMap.map[usb_mixers->audChannelMap.numInputs].name, (char *)mixer_input_name);
+
+ usb_mixers->audChannelMap.numInputs = usb_mixers->audChannelMap.numInputs +1;
+ usb_mixers->usbChannelMap.numInputs = usb_mixers->usbChannelMap.numInputs +1;
+
+ //usb_mixers->num_channel_maps = usb_mixers->num_channel_maps+1;
+ chanCount++;
+ }
+
+#ifdef DEBUG
+ int meh = chanCount - *(currentUnitPtr+OFFSET_IT_BNRCHANNELS);
+ for(int i = 0; i < *(currentUnitPtr+OFFSET_IT_BNRCHANNELS); i++)
+ {
+ printf("%d: %s\n", i,usb_mixers->usb_mixSel[mixer_index].inputStrings[meh+i]);
+ }
+
+ printf("\n\n");
+#endif
+ }
+ else
+ {
+ /* Unit not a input terminal, keep going... */
+ if(*(currentUnitPtr+OFFSET_BDESCRIPTORSUBTYPE) == FEATURE_UNIT)
+ {
+ chanCount = addStrings(data, length, mixer_index, *(currentUnitPtr+OFFSET_FU_BSOURCEID), chanCount);
+ }
+ else if(*(currentUnitPtr+OFFSET_BDESCRIPTORSUBTYPE) == EXTENSION_UNIT)
+ {
+ /* Multiple inputs for Extention units */
+ for (int i = 0; i < *(currentUnitPtr+OFFSET_XU_BNRINPINS); i++)
+ {
+ chanCount = addStrings(data, length, mixer_index, *(currentUnitPtr+OFFSET_XU_BSOURCEID+i), chanCount);
+ }
+ }
+ else
+ {
+ fprintf(stderr,"ERROR: Currently don't support this unit: %d\n",
+ *(currentUnitPtr+OFFSET_BDESCRIPTORSUBTYPE));
+ exit(1);
+ }
+ }
+ }
+ else
+ {
+ fprintf(stderr,"ERROR: Couldn't find unit %d in descs\n", id );
+ exit(1);
+ }
+
+ return chanCount;
+}
+
+/* Returns the source of an mix sel output */
+static unsigned char get_mixsel_value(unsigned int mixer, unsigned int channel)
+{
+ unsigned char data[64];
+ usb_audio_class_get(CUR, CS_XU_SEL, channel, usb_mixers->usb_mixSel[mixer].id, 1, (unsigned char *)data);
+ return data[0];
+}
+
+static int get_mixer_info(const unsigned char *data, int length, unsigned int mixer_index, libusb_config_descriptor *config_desc)
+{
+ const unsigned char *interface_data = data;
+ int interface_len = length;
+ int num_mixer_units_found = 0;
+ //const unsigned char *current_input_term_unit_ptr = NULL;
+ //int current_input_term_unit_index = 0;
+ //const unsigned char *current_feature_unit_ptr = NULL;
+ int devChanInputCount = 0;
+
+ while (interface_len)
+ {
+ const unsigned char *interfaces = interface_data;
+ int interface_type = *(interfaces + 1); /* bDescriptorType */
+ int unit_type = *(interfaces + 2); /* bDescriptorSubType */
+
+ /* Look for a mixer unit */
+ if (interface_type == USB_CS_INTERFACE && unit_type == USB_MIXER_UNIT_TYPE)
+ {
+ int unit_id = *(interfaces + 3); /* bUnitId */
+ int bNrInPins = *(interfaces + 4);
+ int num_in = *(interfaces + 4); /* bNrInPins - NOTE This is pins NOT channels!! */
+ /* Total number of inputs is the sum of the channel counts in the input
+ * clusters. We need to inspect the sources to gain channel counts */
+ int chansIn = 0;
+#ifdef DEBUG
+ printf("Found Mixer Unit %d with %d inputs\n", unit_id, bNrInPins);
+ printf("Inspecting mixer inputs... \n\n");
+#endif
+ /* For each input pin need to find out inspect its output cluster */
+ for (int i = 1; i <= bNrInPins; i++)
+ {
+ int sourceId = *(interfaces+4+i);
+#ifdef DEBUG
+ printf("baSourceID(%d): %d\n", i, sourceId);
+#endif
+
+ /* Find the unit in the config desc */
+ int descsLength = length;
+ const unsigned char *descsData = data;
+ int found = 0;
+ int bDescriptorSubType;
+ int bDescriptorType;
+ int bUnitId;
+
+ while(descsLength)
+ {
+ int currentLength = *descsData;
+ bDescriptorSubType = *(descsData + 2);
+ bDescriptorType = *(descsData + 1);
+
+ if(bDescriptorType == USB_CS_INTERFACE)
+ {
+ if(bDescriptorSubType == USB_FEATURE_UNIT_TYPE ||
+ bDescriptorSubType == USB_INPUT_TERM_TYPE ||
+ bDescriptorSubType == EXTENSION_UNIT )
+ {
+ bUnitId = *(descsData+3);
+ if(bUnitId == sourceId)
+ {
+ found = 1;
+ break;
+ }
+ }
+ }
+
+ descsData+=currentLength;
+ descsLength -= currentLength;
+ }
+
+ if(found)
+ {
+ int bNrChannelsOffset = 0;
+ int bNrChannels;
+
+ /* We found the unit in the descs. Now inspect channel cluster */
+#ifdef DEBUG
+ printf("Found unit %d, type %d\n", bUnitId, bDescriptorSubType);
+#endif
+ /* We are looking for bNrChannels in the descs, this is in a different location in desc depending
+ * on unit type */
+ switch(bDescriptorSubType)
+ {
+ case USB_INPUT_TERM_TYPE:
+ bNrChannelsOffset = 8;
+ bNrChannels = *(descsData+bNrChannelsOffset);
+ break;
+ case EXTENSION_UNIT:
+ bNrChannelsOffset = 7 + *(descsData+6);
+ bNrChannels = *(descsData+bNrChannelsOffset);
+
+ break;
+ default:
+ printf("ERR\n");
+ exit(1);
+ break;
+ }
+#ifdef DEBUG
+ printf("Output chan count: %d\n\n", bNrChannels);
+#endif
+ chansIn += bNrChannels;
+
+ }
+ else
+ {
+ fprintf(stderr,"ERROR: Mixer input connected to something we dont understand...\n");
+ exit(1);
+ }
+ }
+
+ /* get number of output channels straight from mixer unit descriptor: bNrChannels */
+ int num_out = *(interfaces + 5 + num_in);
+#ifdef DEBUG
+ printf("Mixer Unit parse complete: bUnitId: %d, Total Input Chans: %d, Output Chans: %d\n\n", unit_id, chansIn, num_out);
+#endif
+ usb_mixers->usb_mixer[mixer_index].id = unit_id;
+ usb_mixers->usb_mixer[mixer_index].num_inputs = chansIn;
+ usb_mixers->usb_mixer[mixer_index].num_inPins = bNrInPins;
+ usb_mixers->usb_mixer[mixer_index].num_outputs = num_out;
+
+ /* Go through all input pins */
+ const unsigned char *in_unit_start_ptr = interfaces + 5;
+ // const unsigned char *currentUnitPtr = NULL;
+ // int current_input_term_unit_id = 0;
+
+ /* We expect this to be a single input from an XU, but we'll keep it slightly generic here */
+ for (int num = 0; num < usb_mixers->usb_mixer[mixer_index].num_inPins; num++)
+ {
+ /* Save source ID */
+ usb_mixers->usb_mixer[mixer_index].input_connections[num] = *(in_unit_start_ptr+num);
+#ifdef DEBUG
+ printf("Inspecting for Input Terms from mixer unit input pin %d (id: %d)\n",
+ num,usb_mixers->usb_mixer[mixer_index].input_connections[num]);
+#endif
+
+ devChanInputCount = addStrings(data, length, mixer_index,
+ usb_mixers->usb_mixer[mixer_index].input_connections[num], devChanInputCount);
+
+ }
+
+ /* The the first input pin at the mix select for the moment.
+ * probably should be checking if its an XU here */
+ usb_mixers->usb_mixSel[mixer_index].id = usb_mixers->usb_mixer[mixer_index].input_connections[0];
+ usb_mixers->usb_mixSel[mixer_index].numInputs = devChanInputCount;
+ usb_mixers->usb_mixSel[mixer_index].numOutputs = chansIn;
+
+ /* Set up mixer output names */
+ unsigned char mixer_output_name[USB_MIXER_MAX_NAME_LEN];
+ unsigned int iChannelNames = *(interfaces + 10 + bNrInPins);
+
+ for (int i = 0; i < usb_mixers->usb_mixer[mixer_index].num_outputs; i++)
+ {
+ /* Get relevant string descriptor */
+ strcpy(usb_mixers->usb_mixer[mixer_index].output_names[i], "MIX - ");
+ libusb_get_string_descriptor_ascii(devh, iChannelNames+i, mixer_output_name,
+ USB_MIXER_MAX_NAME_LEN - strlen(usb_mixers->usb_mixSel[mixer_index].inputStrings[i]));
+ strcat(usb_mixers->usb_mixer[mixer_index].output_names[i], (char *)mixer_output_name);
+ }
+ }
+
+ interface_data+=*interfaces;
+ interface_len -= *interfaces;
+ }
+
+ return num_mixer_units_found;
+}
+
+static int find_xmos_device(unsigned int id)
+{
+ libusb_device *dev;
+ libusb_device **devs;
+ int i = 0;
+ int found = 0;
+
+ libusb_get_device_list(NULL, &devs);
+
+ while ((dev = devs[i++]) != NULL)
+ {
+ struct libusb_device_descriptor desc;
+ libusb_get_device_descriptor(dev, &desc);
+ // printf("VID = 0x%x, PID = 0x%x\n", desc.idVendor, desc.idProduct);
+ if (desc.idVendor == XMOS_VID && is_supported_device(desc.idProduct))
+ {
+ if (found == id)
+ {
+ if (libusb_open(dev, &devh) < 0)
+ {
+ return -1;
+ }
+ else
+ {
+ libusb_config_descriptor *config_desc = NULL;
+ libusb_get_active_config_descriptor(dev, &config_desc);
+ if (config_desc != NULL)
+ {
+ //unsigned int num_mixers_found = 0;
+
+ usb_mixers->device_open = 1;
+ usb_mixers->num_usb_mixers = 0;
+
+ for (int j = 0; j < config_desc->bNumInterfaces; j++)
+ {
+ const libusb_interface_descriptor *inter_desc =
+ ((libusb_interface *)&config_desc->interface[j])->altsetting;
+
+ usb_mixers->num_usb_mixers += get_num_mixer_units(inter_desc->extra, inter_desc->extra_length);
+ }
+
+ for (int j = 0; j < config_desc->bNumInterfaces; j++)
+ {
+ const libusb_interface_descriptor *inter_desc =
+ ((libusb_interface *)&config_desc->interface[j])->altsetting;
+ get_mixer_info(inter_desc->extra, inter_desc->extra_length, j, config_desc);
+ }
+ }
+ }
+ break;
+ }
+ found++;
+ }
+ }
+
+ libusb_free_device_list(devs, 1);
+
+ /* Init channel maps from device */
+ for(int i = 0; i < usb_mixers->audChannelMap.numOutputs; i++)
+ {
+ usb_mixers->audChannelMap.map[i].cur = dev_get_channel_map(i, ID_XU_OUT);
+
+ }
+
+ for(int i = 0; i < usb_mixers->usbChannelMap.numOutputs; i++)
+ {
+ usb_mixers->usbChannelMap.map[i].cur = dev_get_channel_map(i, ID_XU_IN);
+ //printf("%d\n", usb_mixers->usbChannelMap.map[i].cur);
+ }
+
+ /* Now add the mix outputs */
+ for(int i = 0; i < usb_mixers->num_usb_mixers; i++)
+ {
+ for(int j = 0; j < usb_mixers->usb_mixer[i].num_outputs;j++)
+ {
+ //strcpy(usb_mixers->channel_maps[usb_mixers->num_channel_maps].name, usb_mixers->usb_mixer[i].output_names[j]);
+ //usb_mixers->channel_maps[usb_mixers->num_channel_maps].ctype = (enum usb_chan_type) USB_CHAN_MIXER;
+ //usb_mixers->num_channel_maps = usb_mixers->num_channel_maps+1;
+
+ usb_mixers->audChannelMap.map[usb_mixers->audChannelMap.numInputs].ctype = (enum usb_chan_type) USB_CHAN_MIXER;
+ strcpy(usb_mixers->audChannelMap.map[usb_mixers->audChannelMap.numInputs].name, usb_mixers->usb_mixer[i].output_names[j]);
+ usb_mixers->audChannelMap.numInputs = usb_mixers->audChannelMap.numInputs +1;
+
+ usb_mixers->usbChannelMap.map[usb_mixers->usbChannelMap.numInputs].ctype = (enum usb_chan_type) USB_CHAN_MIXER;
+ strcpy(usb_mixers->usbChannelMap.map[usb_mixers->usbChannelMap.numInputs].name, usb_mixers->usb_mixer[i].output_names[j]);
+ usb_mixers->usbChannelMap.numInputs = usb_mixers->usbChannelMap.numInputs +1;
+ }
+ }
+
+ if(devh)
+ {
+ /* Populate mixer input strings */
+ for(int i = 0; i < usb_mixers->num_usb_mixers; i++)
+ {
+ mixer_update_all_nodes(i);
+
+ /* Get current each mixer input and populate channel number state and strings from device */
+ for (int j = 0; j < usb_mixers->usb_mixSel[i].numOutputs; j++)
+ {
+ /* Get value from device */
+ int inputChan = get_mixsel_value(i, j);
+
+ usb_mixers->usb_mixSel[i].state[j] = inputChan;
+
+ /* Look up channel string */
+ strcpy(usb_mixers->usb_mixer[i].input_names[j], usb_mixers->usb_mixSel[i].inputStrings[inputChan]);
+ }
+ }
+ }
+
+ return devh ? 0 : -1;
+}
+
+// End of libusb interface functions
+
+int usb_mixer_connect()
+{
+ int result = 0;
+
+ // Allocate internal storage
+ usb_mixers = (usb_mixer_handle *)malloc(sizeof(usb_mixer_handle));
+ memset(usb_mixers, 0, sizeof(usb_mixer_handle));
+
+ result = libusb_init(NULL);
+ if (result < 0)
+ {
+ // printf("libusb_init failure\n");
+ return USB_MIXER_FAILURE;
+ }
+
+ result = find_xmos_device(0);
+ if (result < 0)
+ {
+ // printf("find_xmos_device failure\n");
+ return USB_MIXER_FAILURE;
+ }
+
+ return USB_MIXER_SUCCESS;
+}
+
+int usb_mixer_disconnect() {
+ libusb_close(devh);
+
+ libusb_exit(NULL);
+
+ free(usb_mixers);
+
+ return USB_MIXER_SUCCESS;
+}
+
+/* Getter for num_usb_mixers */
+int usb_mixer_get_num_mixers()
+{
+ return usb_mixers->num_usb_mixers;
+}
+
+int usb_mixer_get_num_outputs(unsigned int mixer)
+{
+ return usb_mixers->usb_mixer[mixer].num_outputs;
+}
+
+int usb_mixer_get_num_inputs(unsigned int mixer)
+{
+ return usb_mixers->usb_mixer[mixer].num_inputs;
+}
+
+int usb_mixer_get_layout(unsigned int mixer, unsigned int *inputs, unsigned int *outputs) {
+ *inputs = usb_mixers->usb_mixer[mixer].num_inputs;
+ *outputs = usb_mixers->usb_mixer[mixer].num_outputs;
+ return 0;
+}
+
+/* MixSel getters and setters */
+char *usb_mixsel_get_input_string(unsigned int mixer, unsigned int input)
+{
+ return usb_mixers->usb_mixSel[mixer].inputStrings[input];
+}
+
+int usb_mixsel_get_input_count(unsigned int mixer)
+{
+ return usb_mixers->usb_mixSel[mixer].numInputs;
+}
+
+int usb_mixsel_get_output_count(unsigned int mixer)
+{
+ return usb_mixers->usb_mixSel[mixer].numOutputs;
+}
+
+char *usb_mixer_get_input_name(unsigned int mixer, unsigned int input) {
+ return usb_mixers->usb_mixer[mixer].input_names[input];
+}
+
+char *usb_mixer_get_output_name(unsigned int mixer, unsigned int output) {
+ return usb_mixers->usb_mixer[mixer].output_names[output];
+}
+
+unsigned char usb_mixsel_get_state(unsigned int mixer, unsigned int channel)
+{
+ return usb_mixers->usb_mixSel[mixer].state[channel];
+}
+
+void usb_mixsel_set_state(unsigned int mixer, unsigned int dst, unsigned int src)
+{
+ // write to device
+ usb_audio_class_set(CUR, CS_XU_SEL, dst, usb_mixers->usb_mixSel[mixer].id, 1, (unsigned char *)&src);
+
+ // update object state
+ usb_mixers->usb_mixSel[mixer].state[dst] = src;
+
+ // update local object strings
+ // TODO we don't really need to store strings since we can look them up...*/
+ strcpy(usb_mixers->usb_mixer[mixer].input_names[dst], usb_mixers->usb_mixSel[mixer].inputStrings[src]);
+}
+
+double usb_mixer_get_value(unsigned int mixer, unsigned int nodeId)
+{
+ return (double)usb_mixers->usb_mixer[mixer].nodes[nodeId].weight;
+}
+
+double usb_mixer_get_res(unsigned int mixer, unsigned int nodeId)
+{
+ return (double)usb_mixers->usb_mixer[mixer].nodes[nodeId].res;
+}
+
+double usb_mixer_get_min(unsigned int mixer, unsigned int nodeId)
+{
+ return (double)usb_mixers->usb_mixer[mixer].nodes[nodeId].min;
+}
+
+double usb_mixer_get_max(unsigned int mixer, unsigned int nodeId)
+{
+ return (double)usb_mixers->usb_mixer[mixer].nodes[nodeId].max;
+}
+
+int usb_mixer_set_value(unsigned int mixer, unsigned int nodeId, double val)
+{
+ /* check if update required */
+ if(usb_mixers->usb_mixer[mixer].nodes[nodeId].weight != val)
+ {
+ /* update local object */
+ usb_mixers->usb_mixer[mixer].nodes[nodeId].weight= val;
+
+ /* write to device */
+ short value = (short) (val * 256);
+
+ usb_audio_class_set(CUR, 1, 1<<8 | nodeId & 0xff, usb_mixers->usb_mixer[mixer].id, 2, (unsigned char *)&value);
+
+ }
+ return 0;
+}
+
+int usb_mixer_get_range(unsigned int mixer, unsigned int mixer_unit, int *min, int *max, int *res)
+{
+ // range 0x02
+ return 0;
+}
+
+int usb_get_usb_channel_map(int channel)
+{
+ return usb_mixers->usbChannelMap.map[channel].cur;
+}
+
+int usb_get_aud_channel_map(int channel)
+{
+ return usb_mixers->audChannelMap.map[channel].cur;
+}
+
+int usb_set_aud_channel_map(int channel, int val)
+{
+ /* Check if update required */
+ if(usb_mixers->audChannelMap.map[channel].cur != val)
+ {
+ /* Update local object */
+ usb_mixers->audChannelMap.map[channel].cur = val;
+
+ /* Write setting to dev */
+ dev_set_channel_map(channel, val, ID_XU_OUT);
+ }
+ return 0;
+}
+
+int usb_set_usb_channel_map(int channel, int val)
+{
+ /* Check if update required */
+ if(usb_mixers->usbChannelMap.map[channel].cur != val)
+ {
+ /* Update local object */
+ usb_mixers->usbChannelMap.map[channel].cur = val;
+
+ /* Write setting to dev */
+ dev_set_channel_map(channel, val, ID_XU_IN);
+ }
+ return 0;
+}
+
+enum usb_chan_type usb_get_aud_channel_map_type(int channel)
+{
+ return usb_mixers->audChannelMap.map[channel].ctype;
+}
+
+enum usb_chan_type usb_get_usb_channel_map_type(int channel)
+{
+ return usb_mixers->usbChannelMap.map[channel].ctype;
+}
+
+char *usb_get_aud_channel_map_name(int channel)
+{
+ return usb_mixers->audChannelMap.map[channel].name;
+}
+
+char *usb_get_usb_channel_map_name(int channel)
+{
+ return usb_mixers->usbChannelMap.map[channel].name;
+}
+
+int usb_get_aud_channel_map_num_outputs()
+{
+ return usb_mixers->audChannelMap.numOutputs;
+}
+int usb_get_usb_channel_map_num_outputs()
+{
+ return usb_mixers->usbChannelMap.numOutputs;
+}
+
+int usb_get_aud_channel_map_num_inputs()
+{
+ return usb_mixers->audChannelMap.numInputs;
+}
+int usb_get_usb_channel_map_num_inputs()
+{
+ return usb_mixers->usbChannelMap.numInputs;
+}
+
diff --git a/host_usb_mixer_control/README b/host_usb_mixer_control/README
new file mode 100644
index 00000000..b194224a
--- /dev/null
+++ b/host_usb_mixer_control/README
@@ -0,0 +1,115 @@
+The XMOS USB Audio L2 Reference Design contains an 18x8 mixer unit
+(note that at sample rates above 96Khz only the first two outputs are
+enabled).
+
+This unit takes input takes 18 inputs: USB OUT channels 1..10 and
+DEVICE IN channels 1..6,9..10 and produces 8 outputs: Mixer Output
+1..8
+
+Before the mixer there is an unit that allows the selection of the 18 mixer inputs
+from all the possible device inputs (DAW and physical audio). This is
+an extension unit with id 50 in the descriptors
+
+After the mixer unit there is are channel map units for each output terminal:
+Each of these outputs can select a source from one of 28 channels sources: USB OUT
+channels 1..10, DEVICE IN channels 1..10 and Mixer Output 1..8
+
+The channel map units are extension unit with init ids 51 and 52. This unit
+lets you implement arbitrary routings including loopbacks.
+
+The mixer is control on MAC OS X via the command line utility
+xmos_mixer. Running this application requires having the
+libusb-1.0.0.dylib in the dynamic library load path. Sourcing the
+setup.sh script will do this. Source code for the application is
+provided as a guide on how to communicate with the device.
+
+Here are the commands for the mixer application (note that the USB
+audio reference design has only one unit so the mixer_id argument
+should always be 0):
+
+ --help
+
+
+ --display-info
+
+Show information about the device.
+
+ --display-mixer-nodes mixer_id
+
+Display all the weights of all the mixer nodes (and their id) of a particular mixer.
+
+ --display-min mixer_id
+
+Display the minimum allowable weights of a particular mixer.
+
+ --display-max mixer_id
+
+Display the maximum allowable weights of a particular mixer.
+
+ --display-res mixer_id
+
+Display the resolution of a particular mixer.
+
+ --set-value mixer_id mixer_unit value
+
+Set the weight value in the mixer. The second argument should
+correspond to the values shown by the --display-unit command. Values
+can range from -127db to +128db with the special value -inf for mute.
+
+ --get-value mixer_id mixer_unit
+
+Get the weight value in the mixer. The second argument should
+correspond to the values shown by the --display-unit command. Values
+can range from -127db to +128db with the special value -inf for mute.
+
+ --set-mixer-source mixer_id, dst_channel_id, src_channel_id
+
+Allows the selection of the mixer inputs. Sets mixer input (dst) to src
+
+ --display-current-mixer-sources mixer_id
+
+Displays the current inputs to a particular mixer
+
+ --display-available-mixer-sources mixer_id
+
+Displays all the input channels available that can be fed into the inputs of a particular mixer
+
+ --set-aud-channel-map dst src
+
+Sets a channel map value for the device audio output
+
+ --display-aud-channel-map
+
+Show audio output channel map i.e. for each audio output of the device what the source is.
+
+ --display-aud-channel-map-sources
+
+Show the available audio output channel map sources.
+
+ --set-daw-channel-map dst src
+
+Sets a channel map value for the DAW output to the host
+
+ --display-daw-channel-map
+
+Show audio output channel map i.e. for each DAW output to host, what the source is.
+
+ --display-daw-channel-map-sources
+
+Show the DAW output channel map sources.
+
+ --get-mixer-levels-input
+
+ --get-mixer-levels-output
+
+ --vendor-audio-request-get bRequest, ControlSelector, ChannelNumber, UnitId
+
+ --vendor-audio-request-set bRequest, ControlSelector, ChannelNumber, UnitId, Data[0], Data[1],...
+
+
+
+
+
+
+
+
diff --git a/host_usb_mixer_control/Win32/global.h b/host_usb_mixer_control/Win32/global.h
new file mode 100644
index 00000000..cec10f4d
--- /dev/null
+++ b/host_usb_mixer_control/Win32/global.h
@@ -0,0 +1,47 @@
+// Copyright 2022-2023 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+
+/************************************************************************
+ *
+ * Module: global.h
+ * Description:
+ * APP global includes, constants, declarations, etc.
+ *
+ * Author(s):
+ * Udo Eberhardt
+ *
+ * Companies:
+ * Thesycon GmbH, Germany http://www.thesycon.de
+ *
+ ************************************************************************/
+
+#ifndef __global_h__
+#define __global_h__
+
+// define the Windows versions supported by the application
+#define _WIN32_WINNT 0x0500 //Windows 2000 or later
+//#define _WIN32_WINNT 0x0501 //Windows XP or later
+//#define _WIN32_WINNT 0x0600 //Windows Vista or later
+
+// exclude rarely-used stuff from Windows headers
+#define WIN32_LEAN_AND_MEAN
+
+#include
+
+#include
+#include
+
+
+// version defs
+//#include "version.h"
+
+// libwn.h pulls in windows.h
+#include "libwn.h"
+// TUSBAUDIO driver API
+#include "tusbaudioapi.h"
+#include "TUsbAudioApiDll.h"
+
+
+#endif // __global_h__
+
+/*************************** EOF **************************************/
diff --git a/host_usb_mixer_control/Win32/usb_mixer.cpp b/host_usb_mixer_control/Win32/usb_mixer.cpp
new file mode 100644
index 00000000..08b0d406
--- /dev/null
+++ b/host_usb_mixer_control/Win32/usb_mixer.cpp
@@ -0,0 +1,919 @@
+// Copyright 2022-2023 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+#include
+#include
+#include
+#include "usb_mixer.h"
+#include "global.h"
+
+//driver interface
+TUsbAudioApiDll gDrvApi;
+
+//###################################
+
+/* Note: this is all quite generic and could be simplified ALOT for a specific design */
+
+// TODO we dont really need to store mixer input strings
+// Currently res, max, min dont get populated
+
+#define XMOS_VID 0x20b1
+#define XMOS_L1_AUDIO2_PID 0x0002
+#define XMOS_L1_AUDIO1_PID 0x0003
+#define XMOS_L2_AUDIO2_PID 0x0004
+
+#define USB_REQUEST_TO_DEV 0x21 /* D7 Data direction: 0 (Host to device)
+ * D6:5 Type: 01 (Class)
+ * D4:0 Receipient: 1 (Interface) */
+#define USB_REQUEST_FROM_DEV 0xa1
+
+#define USB_CS_INTERFACE 0x24
+#define USB_INPUT_TERM_TYPE 0x02
+#define USB_MIXER_UNIT_TYPE 0x04
+#define USB_FEATURE_UNIT_TYPE 0x06
+
+#define INPUT_TERMINAL USB_INPUT_TERM_TYPE
+#define EXTENSION_UNIT 0x9
+#define CS_INTERFACE USB_CS_INTERFACE
+#define FEATURE_UNIT 0x06
+
+#define CS_XU_SEL 0x6
+#define MU_MIXER_CONTROL 0x1
+
+// Output from PC
+#define USB_STREAMING 0x01
+// Input to device
+//#define MICROPHONE 0x02
+
+#define ID_XU_OUT 51
+#define ID_XU_IN 52
+
+#define OFFSET_BLENGTH 0
+#define OFFSET_BDESCRIPTORTYPE 1
+#define OFFSET_BDESCRIPTORSUBTYPE 2
+#define OFFSET_BUNITID 3
+
+#define OFFSET_FU_BSOURCEID 4
+
+#define OFFSET_XU_BNRINPINS 6
+#define OFFSET_XU_BSOURCEID 7
+
+#define OFFSET_IT_WTERMINALTYPE 5
+#define OFFSET_IT_BNRCHANNELS 8
+#define OFFSET_IT_ICHANNELNAMES 13
+
+typedef struct
+{
+ double min;
+ double max;
+ double res;
+ double weight;
+} mixer_node;
+
+typedef struct
+{
+ unsigned int id;
+ unsigned int num_inputs;
+ char input_names[USB_MIXER_INPUTS][USB_MIXER_MAX_NAME_LEN]; /* Current mixer input names-
+ * we dont really need to store these */
+ int input_connections[USB_MIXER_INPUTS];
+ unsigned int num_outputs;
+ char output_names[USB_MIXER_INPUTS][USB_MIXER_MAX_NAME_LEN];
+ unsigned int num_inPins;
+ mixer_node nodes[USB_MIXER_INPUTS * USB_MIXER_OUTPUTS];
+} usb_mixer_device;
+
+typedef struct {
+ int cur;
+ int default_value;
+ char name[USB_MIXER_MAX_NAME_LEN];
+ enum usb_chan_type ctype;
+} channel_map_node;
+
+typedef struct {
+ int numInputs;
+ int numOutputs;
+ channel_map_node map[USB_MAX_CHANNEL_MAP_SIZE];
+} channel_mapp;
+
+typedef struct
+{
+ unsigned int id;
+ unsigned int numInputs;
+ char inputStrings[USB_MIXER_INPUTS*4][USB_MIXER_MAX_NAME_LEN]; /* Complete list of all possible inputs */
+ unsigned int numOutputs;
+ unsigned int state[USB_MIXER_INPUTS];
+} t_usb_mixSel;
+
+typedef struct {
+ unsigned int device_open;
+ unsigned int num_usb_mixers;
+ usb_mixer_device usb_mixer[USB_MIXERS];
+ t_usb_mixSel usb_mixSel[USB_MIXERS];
+
+ channel_mapp audChannelMap;
+ channel_mapp usbChannelMap;
+
+
+} usb_mixer_handle;
+
+static usb_mixer_handle *usb_mixers = NULL;
+
+static TUsbAudioHandle h;
+
+/* Issue a generic control/class GET request to a specific unit in the Audio Interface */
+int usb_audio_class_get(unsigned char bRequest, unsigned char cs, unsigned char cn, unsigned short unitID, unsigned short wLength, unsigned char *data)
+{
+ return TUSBAUDIO_AudioControlRequestGet(h,
+ unitID,
+ bRequest,
+ cs,
+ cn,
+ data,
+ wLength,
+ NULL,
+ 1000);
+}
+
+/* Issue a generic control/class SET request to a specific unit in the Audio Interface */
+int usb_audio_class_set(unsigned char bRequest, unsigned char cs, unsigned char cn, unsigned short unitID, unsigned short wLength, unsigned char *data)
+{
+ return TUSBAUDIO_AudioControlRequestSet(h,
+ unitID,
+ bRequest,
+ cs,
+ cn,
+ data,
+ wLength,
+ NULL,
+ 1000);
+}
+
+/* Note, this never get cached in an object since it can change on the device side */
+int usb_mixer_mem_get(unsigned int mixer, unsigned offset, unsigned char *data)
+{
+ return TUSBAUDIO_AudioControlRequestGet(h,
+ usb_mixers->usb_mixer[mixer].id,
+ MEM,
+ 0, // cs
+ offset, //was cn
+ &data,
+ 64,
+ NULL,
+ 1000);
+}
+
+static const unsigned char *find_input_term_unit_by_id(const unsigned char *data, int length, int id)
+{
+ const unsigned char *interface_data = data;
+ while (length)
+ {
+ const unsigned char *interface_len = interface_data;
+ int sub_type = *(interface_len + 2);
+ if (sub_type == USB_INPUT_TERM_TYPE)
+ {
+ int unit_id = *(interface_len + 3);
+ if (unit_id == id)
+ {
+ return interface_len;
+ }
+ }
+ interface_data+=*interface_len;
+ length -= *interface_len;
+ }
+ return NULL;
+}
+
+static const unsigned char *find_connected_feature_unit_by_id(const unsigned char *data, int length, int id) {
+ const unsigned char *interface_data = data;
+ while (length)
+ {
+ const unsigned char *interface_len = interface_data;
+ int sub_type = *(interface_len + 2);
+ if (sub_type == USB_FEATURE_UNIT_TYPE) {
+ //int unit_id = *(interface_len + 3);
+ int src_unit_id = *(interface_len + 4);
+ if (src_unit_id == id) {
+ return interface_len;
+ }
+ }
+ interface_data+=*interface_len;
+ length -= *interface_len;
+ }
+ return NULL;
+}
+
+static const unsigned char *findUnit(const unsigned char *descs, int length, int id)
+{
+ const unsigned char *interface_data = descs;
+ while (length)
+ {
+ const unsigned char *interface_len = interface_data;
+ int bDescriptorType = *(interface_len + 1);
+ if (bDescriptorType == CS_INTERFACE)
+ {
+ int unit_id = *(interface_len + 3);
+ if (unit_id == id)
+ {
+ return interface_len;
+ }
+ }
+ interface_data+=*interface_len;
+ length -= *interface_len;
+ }
+ return NULL;
+}
+
+static int get_num_mixer_units(const unsigned char *data, int length) {
+ const unsigned char *interface_data = data;
+ int interface_len = length;
+ int num_mixer_units_found = 0;
+
+ while (interface_len) {
+ const unsigned char *interfaces = interface_data;
+ int interface_type = *(interfaces + 1);
+ int unit_type = *(interfaces + 2);
+ if (interface_type == USB_CS_INTERFACE && unit_type == USB_MIXER_UNIT_TYPE) {
+ num_mixer_units_found++;
+ }
+ interface_data+=*interfaces;
+ interface_len -= *interfaces;
+ }
+
+ return num_mixer_units_found;
+}
+
+static double dev_get_mixer_value(unsigned int mixer, unsigned int nodeId)
+{
+ // MU_MIXER_CONTROL 0x01
+ short data;
+ usb_audio_class_get(CUR, 0x01<<8, nodeId, usb_mixers->usb_mixer[mixer].id, 2,(unsigned char *) &data);
+ return ((double) data / 256);
+}
+
+/* Populates min, max, res */
+static unsigned short dev_get_mixer_range(unsigned int mixer, unsigned int channel,
+ double *min, double *max, double *res)
+{
+ short data[64];
+
+ short min2, max2, res2;
+
+ usb_audio_class_get(RANGE, MU_MIXER_CONTROL, channel, usb_mixers->usb_mixer[mixer].id, 8, (unsigned char *) data);
+
+ min2 = data[1];
+ max2 = data[2];
+ res2 = data[3];
+ //printf("%f, %f, %f\n", (double)min2/256, (double)max2/256, (double) res2/256);
+ *min = (double)min2/256;
+ *max = (double)max2/256;
+ *res = (double)res2/256;
+
+ return 0;
+}
+
+int dev_get_channel_map(int channel, int unitId)
+{
+ short data;
+ usb_audio_class_get(CUR, 0, channel, unitId, 2,(unsigned char *) &data);
+ return data;
+}
+
+static int dev_set_channel_map(int channel, int val, int unitId)
+{
+ short value = val;
+ usb_audio_class_set(CUR, 0, channel, unitId, 1, (unsigned char *)&value);
+ return 0;
+}
+
+static int mixer_update_all_nodes(unsigned int mixer_index)
+{
+ int i = 0;
+ int j = 0;
+ double min, max, res;
+
+ for (i = 0; i < usb_mixers->usb_mixer[mixer_index].num_inputs; i++)
+ {
+ for (j = 0; j < usb_mixers->usb_mixer[mixer_index].num_outputs; j++)
+ {
+ dev_get_mixer_range(mixer_index, (i*usb_mixers->usb_mixer[mixer_index].num_outputs)+j, &min, &max, &res);
+
+ usb_mixers->usb_mixer[mixer_index].nodes[(i*usb_mixers->usb_mixer[mixer_index].num_outputs)+j].min = min;
+ usb_mixers->usb_mixer[mixer_index].nodes[(i*usb_mixers->usb_mixer[mixer_index].num_outputs)+j].max = max;
+ usb_mixers->usb_mixer[mixer_index].nodes[(i*usb_mixers->usb_mixer[mixer_index].num_outputs)+j].res = res;
+ //printf("%f, %f, %f\n", min, max, res);
+
+ usb_mixers->usb_mixer[mixer_index].nodes[(i*usb_mixers->usb_mixer[mixer_index].num_outputs)+j].weight =
+ dev_get_mixer_value(mixer_index, (i*usb_mixers->usb_mixer[mixer_index].num_outputs)+j);
+ }
+ }
+ return 0;
+}
+
+/* Start at unit %id, find it in descs, keep recursively parsing up path(s) until get to Input Term and add strings */
+int addStrings(const unsigned char *data, int length, int mixer_index, int id, int chanCount)
+{
+ const unsigned char *currentUnitPtr = NULL;
+
+ /* Find this unit in the descs */
+ currentUnitPtr = findUnit(data, length, id);
+ TUsbAudioStatus st;
+
+ if(currentUnitPtr != NULL)
+ {
+ /* Check if unit is a Input term */
+ if(*(currentUnitPtr+OFFSET_BDESCRIPTORSUBTYPE) == INPUT_TERMINAL)
+ {
+
+ /* Get channel names */
+#ifdef DEBUG
+ printf("Input terminal found on path (ID: %d): %d channels, total: %d\n",*(currentUnitPtr+OFFSET_BUNITID),
+ *(currentUnitPtr+OFFSET_IT_BNRCHANNELS), chanCount);
+#endif
+
+ int iChannelNames = *(currentUnitPtr+OFFSET_IT_ICHANNELNAMES);
+ int wTerminalType = *(currentUnitPtr+OFFSET_IT_WTERMINALTYPE);
+
+#ifdef DEBUG
+ printf("iChannelNames: %d wTerminalType: %d\n", iChannelNames, wTerminalType);
+
+ printf("Channels found:\n");
+
+#endif
+ for(int i = 0; i < *(currentUnitPtr+OFFSET_IT_BNRCHANNELS); i++)
+ {
+ WCHAR mixer_input_name[USB_MIXER_MAX_NAME_LEN];
+ char mixer_input_name_copy[USB_MIXER_MAX_NAME_LEN];
+ if (wTerminalType == 1)
+ {
+ strcpy(usb_mixers->usb_mixSel[mixer_index].inputStrings[chanCount], "DAW - ");
+
+ //usb_mixers->channel_maps[usb_mixers->num_channel_maps].ctype = (enum usb_chan_type) USB_CHAN_OUT;
+
+ usb_mixers->audChannelMap.numOutputs = usb_mixers->audChannelMap.numOutputs +1;
+
+ usb_mixers->audChannelMap.map[usb_mixers->audChannelMap.numInputs].ctype = (enum usb_chan_type) USB_CHAN_OUT;
+ usb_mixers->usbChannelMap.map[usb_mixers->usbChannelMap.numInputs].ctype = (enum usb_chan_type) USB_CHAN_OUT;
+
+ }
+ else
+ {
+ strcpy(usb_mixers->usb_mixSel[mixer_index].inputStrings[chanCount], "AUD - ");
+
+ //usb_mixers->channel_maps[usb_mixers->num_channel_maps].ctype = (enum usb_chan_type) USB_CHAN_IN;
+
+ usb_mixers->audChannelMap.map[usb_mixers->audChannelMap.numInputs].ctype = (enum usb_chan_type) USB_CHAN_IN;
+ usb_mixers->usbChannelMap.map[usb_mixers->usbChannelMap.numInputs].ctype = (enum usb_chan_type) USB_CHAN_IN;
+
+
+ usb_mixers->usbChannelMap.numOutputs = usb_mixers->usbChannelMap.numOutputs +1;
+ }
+ /* Get relevant string descriptor */
+ //libusb_get_string_descriptor_ascii(devh, iChannelNames+i, mixer_input_name, USB_MIXER_MAX_NAME_LEN - strlen(usb_mixers->usb_mixSel[mixer_index].inputStrings[chanCount]));
+ st = TUSBAUDIO_GetUsbStringDescriptorString(h, iChannelNames+i, 0, mixer_input_name, USB_MIXER_MAX_NAME_LEN - strlen(usb_mixers->usb_mixSel[mixer_index].inputStrings[chanCount]));
+ if ( TSTATUS_SUCCESS != st ) {
+ return USB_MIXER_FAILURE;
+ }
+ wcstombs(mixer_input_name_copy, mixer_input_name, USB_MIXER_MAX_NAME_LEN);
+
+ strcat(usb_mixers->usb_mixSel[mixer_index].inputStrings[chanCount], (char *)mixer_input_name_copy);
+
+ /* Add to channel mappers also */
+ //strcat(usb_mixers->channel_maps[usb_mixers->num_channel_maps].name, (char *)mixer_input_name_copy);
+ strcat(usb_mixers->audChannelMap.map[usb_mixers->audChannelMap.numInputs ].name, (char *)mixer_input_name_copy);
+ strcat(usb_mixers->usbChannelMap.map[usb_mixers->audChannelMap.numInputs].name, (char *)mixer_input_name_copy);
+
+ usb_mixers->audChannelMap.numInputs = usb_mixers->audChannelMap.numInputs +1;
+ usb_mixers->usbChannelMap.numInputs = usb_mixers->usbChannelMap.numInputs +1;
+
+ //usb_mixers->num_channel_maps = usb_mixers->num_channel_maps+1;
+ chanCount++;
+ }
+
+#ifdef DEBUG
+ int meh = chanCount - *(currentUnitPtr+OFFSET_IT_BNRCHANNELS);
+ for(int i = 0; i < *(currentUnitPtr+OFFSET_IT_BNRCHANNELS); i++)
+ {
+ printf("%d: %s\n", i,usb_mixers->usb_mixSel[mixer_index].inputStrings[meh+i]);
+ }
+
+ printf("\n\n");
+#endif
+ }
+ else
+ {
+ /* Unit not a input terminal, keep going... */
+ if(*(currentUnitPtr+OFFSET_BDESCRIPTORSUBTYPE) == FEATURE_UNIT)
+ {
+ chanCount = addStrings(data, length, mixer_index, *(currentUnitPtr+OFFSET_FU_BSOURCEID), chanCount);
+ }
+ else if(*(currentUnitPtr+OFFSET_BDESCRIPTORSUBTYPE) == EXTENSION_UNIT)
+ {
+ /* Multiple inputs for Extention units */
+ for (int i = 0; i < *(currentUnitPtr+OFFSET_XU_BNRINPINS); i++)
+ {
+ chanCount = addStrings(data, length, mixer_index, *(currentUnitPtr+OFFSET_XU_BSOURCEID+i), chanCount);
+ }
+ }
+ else
+ {
+ fprintf(stderr,"ERROR: Currently don't support this unit: %d\n",
+ *(currentUnitPtr+OFFSET_BDESCRIPTORSUBTYPE));
+ exit(1);
+ }
+ }
+ }
+ else
+ {
+ fprintf(stderr,"ERROR: Couldn't find unit %d in descs\n", id );
+ exit(1);
+ }
+
+ return chanCount;
+}
+
+/* Returns the source of an mix sel output */
+static unsigned char get_mixsel_value(unsigned int mixer, unsigned int channel)
+{
+ unsigned char data[64];
+ usb_audio_class_get(CUR, CS_XU_SEL, channel, usb_mixers->usb_mixSel[mixer].id, 1, (unsigned char *)data);
+ return data[0];
+}
+
+static int get_mixer_info(const unsigned char *data, int length, unsigned int mixer_index)
+{
+ const unsigned char *interface_data = data;
+ int interface_len = length;
+ int num_mixer_units_found = 0;
+ //const unsigned char *current_input_term_unit_ptr = NULL;
+ //int current_input_term_unit_index = 0;
+ //const unsigned char *current_feature_unit_ptr = NULL;
+ int devChanInputCount = 0;
+
+ while (interface_len)
+ {
+ const unsigned char *interfaces = interface_data;
+ int interface_type = *(interfaces + 1); /* bDescriptorType */
+ int unit_type = *(interfaces + 2); /* bDescriptorSubType */
+
+ /* Look for a mixer unit */
+ if (interface_type == USB_CS_INTERFACE && unit_type == USB_MIXER_UNIT_TYPE)
+ {
+ int unit_id = *(interfaces + 3); /* bUnitId */
+ int bNrInPins = *(interfaces + 4);
+ int num_in = *(interfaces + 4); /* bNrInPins - NOTE This is pins NOT channels!! */
+ /* Total number of inputs is the sum of the channel counts in the input
+ * clusters. We need to inspect the sources to gain channel counts */
+ int chansIn = 0;
+#ifdef DEBUG
+ printf("Found Mixer Unit %d with %d inputs\n", unit_id, bNrInPins);
+ printf("Inspecting mixer inputs... \n\n");
+#endif
+ /* For each input pin need to find out inspect its output cluster */
+ for (int i = 1; i <= bNrInPins; i++)
+ {
+ int sourceId = *(interfaces+4+i);
+#ifdef DEBUG
+ printf("baSourceID(%d): %d\n", i, sourceId);
+#endif
+
+ /* Find the unit in the config desc */
+ int descsLength = length;
+ const unsigned char *descsData = data;
+ int found = 0;
+ int bDescriptorSubType;
+ int bDescriptorType;
+ int bUnitId;
+
+ while(descsLength)
+ {
+ int currentLength = *descsData;
+ bDescriptorSubType = *(descsData + 2);
+ bDescriptorType = *(descsData + 1);
+
+ if(bDescriptorType == USB_CS_INTERFACE)
+ {
+ if(bDescriptorSubType == USB_FEATURE_UNIT_TYPE ||
+ bDescriptorSubType == USB_INPUT_TERM_TYPE ||
+ bDescriptorSubType == EXTENSION_UNIT )
+ {
+ bUnitId = *(descsData+3);
+ if(bUnitId == sourceId)
+ {
+ found = 1;
+ break;
+ }
+ }
+ }
+
+ descsData+=currentLength;
+ descsLength -= currentLength;
+ }
+
+ if(found)
+ {
+ int bNrChannelsOffset = 0;
+ int bNrChannels;
+
+ /* We found the unit in the descs. Now inspect channel cluster */
+#ifdef DEBUG
+ printf("Found unit %d, type %d\n", bUnitId, bDescriptorSubType);
+#endif
+ /* We are looking for bNrChannels in the descs, this is in a different location in desc depending
+ * on unit type */
+ switch(bDescriptorSubType)
+ {
+ case USB_INPUT_TERM_TYPE:
+ bNrChannelsOffset = 8;
+ bNrChannels = *(descsData+bNrChannelsOffset);
+ break;
+ case EXTENSION_UNIT:
+ bNrChannelsOffset = 7 + *(descsData+6);
+ bNrChannels = *(descsData+bNrChannelsOffset);
+
+ break;
+ default:
+ printf("ERR\n");
+ exit(1);
+ break;
+ }
+#ifdef DEBUG
+ printf("Output chan count: %d\n\n", bNrChannels);
+#endif
+ chansIn += bNrChannels;
+
+ }
+ else
+ {
+ fprintf(stderr,"ERROR: Mixer input connected to something we dont understand...\n");
+ exit(1);
+ }
+ }
+
+ /* get number of output channels straight from mixer unit descriptor: bNrChannels */
+ int num_out = *(interfaces + 5 + num_in);
+#ifdef DEBUG
+ printf("Mixer Unit parse complete: bUnitId: %d, Total Input Chans: %d, Output Chans: %d\n\n", unit_id, chansIn, num_out);
+#endif
+ usb_mixers->usb_mixer[mixer_index].id = unit_id;
+ usb_mixers->usb_mixer[mixer_index].num_inputs = chansIn;
+ usb_mixers->usb_mixer[mixer_index].num_inPins = bNrInPins;
+ usb_mixers->usb_mixer[mixer_index].num_outputs = num_out;
+
+ /* Go through all input pins */
+ const unsigned char *in_unit_start_ptr = interfaces + 5;
+ // const unsigned char *currentUnitPtr = NULL;
+ // int current_input_term_unit_id = 0;
+
+ /* We expect this to be a single input from an XU, but we'll keep it slightly generic here */
+ for (int num = 0; num < usb_mixers->usb_mixer[mixer_index].num_inPins; num++)
+ {
+ /* Save source ID */
+ usb_mixers->usb_mixer[mixer_index].input_connections[num] = *(in_unit_start_ptr+num);
+#ifdef DEBUG
+ printf("Inspecting for Input Terms from mixer unit input pin %d (id: %d)\n",
+ num,usb_mixers->usb_mixer[mixer_index].input_connections[num]);
+#endif
+
+ devChanInputCount = addStrings(data, length, mixer_index,
+ usb_mixers->usb_mixer[mixer_index].input_connections[num], devChanInputCount);
+
+ }
+
+ /* The the first input pin at the mix select for the moment.
+ * probably should be checking if its an XU here */
+ usb_mixers->usb_mixSel[mixer_index].id = usb_mixers->usb_mixer[mixer_index].input_connections[0];
+ usb_mixers->usb_mixSel[mixer_index].numInputs = devChanInputCount;
+ usb_mixers->usb_mixSel[mixer_index].numOutputs = chansIn;
+
+ /* Set up mixer output names */
+ WCHAR mixer_output_name[USB_MIXER_MAX_NAME_LEN];
+ char mixer_output_name_copy[USB_MIXER_MAX_NAME_LEN];
+ unsigned int iChannelNames = *(interfaces + 10 + bNrInPins);
+
+ for (int i = 0; i < usb_mixers->usb_mixer[mixer_index].num_outputs; i++)
+ {
+ /* Get relevant string descriptor */
+ strcpy(usb_mixers->usb_mixer[mixer_index].output_names[i], "MIX - ");
+ // libusb_get_string_descriptor_ascii(devh, iChannelNames+i, mixer_output_name, USB_MIXER_MAX_NAME_LEN - strlen(usb_mixers->usb_mixSel[mixer_index].inputStrings[i]));
+ TUsbAudioStatus st = TUSBAUDIO_GetUsbStringDescriptorString(h, iChannelNames+i, 0, mixer_output_name, USB_MIXER_MAX_NAME_LEN - strlen(usb_mixers->usb_mixSel[mixer_index].inputStrings[i]));
+ if ( TSTATUS_SUCCESS != st ) {
+ return USB_MIXER_FAILURE;
+ }
+ wcstombs(mixer_output_name_copy, mixer_output_name, USB_MIXER_MAX_NAME_LEN);
+ // strcat(usb_mixers->usb_mixer[mixer_index].output_names[i], (char *)mixer_output_name);
+ strcat(usb_mixers->usb_mixer[mixer_index].output_names[i], mixer_output_name_copy);
+ }
+ }
+
+ interface_data+=*interfaces;
+ interface_len -= *interfaces;
+ }
+
+ return num_mixer_units_found;
+}
+
+static int find_xmos_device(unsigned int id) {
+ //libusb_device *dev;
+ //libusb_device **devs;
+ int i = 0;
+ int found = 0;
+ TUsbAudioStatus st;
+
+ unsigned int devcnt = TUSBAUDIO_GetDeviceCount();
+ if ( 0 == devcnt ) {
+ return USB_MIXER_FAILURE;
+ }
+
+ st = TUSBAUDIO_OpenDeviceByIndex(0,&h);
+ if ( TSTATUS_SUCCESS != st ) {
+ h = 0;
+ // skip
+ } else {
+ unsigned int numBytes = 0;
+ unsigned char descBuffer[64*1024];
+
+ st = TUSBAUDIO_GetUsbConfigDescriptor(h, descBuffer, 64*1024, &numBytes);
+ if ( TSTATUS_SUCCESS != st ) {
+ return USB_MIXER_FAILURE;
+ }
+
+ usb_mixers->num_usb_mixers = get_num_mixer_units(descBuffer, numBytes);
+
+ get_mixer_info(descBuffer, numBytes, 0);
+
+ /* Init channel maps from device */
+ for(int i = 0; i < usb_mixers->audChannelMap.numOutputs; i++)
+ {
+ usb_mixers->audChannelMap.map[i].cur = dev_get_channel_map(i, ID_XU_OUT);
+
+ }
+
+ for(int i = 0; i < usb_mixers->usbChannelMap.numOutputs; i++)
+ {
+ usb_mixers->usbChannelMap.map[i].cur = dev_get_channel_map(i, ID_XU_IN);
+ //printf("%d\n", usb_mixers->usbChannelMap.map[i].cur);
+ }
+
+ /* Now add the mix outputs */
+ for(int i = 0; i < usb_mixers->num_usb_mixers; i++)
+ {
+ for(int j = 0; j < usb_mixers->usb_mixer[i].num_outputs;j++)
+ {
+ //strcpy(usb_mixers->channel_maps[usb_mixers->num_channel_maps].name, usb_mixers->usb_mixer[i].output_names[j]);
+ //usb_mixers->channel_maps[usb_mixers->num_channel_maps].ctype = (enum usb_chan_type) USB_CHAN_MIXER;
+ //usb_mixers->num_channel_maps = usb_mixers->num_channel_maps+1;
+
+ usb_mixers->audChannelMap.map[usb_mixers->audChannelMap.numInputs].ctype = (enum usb_chan_type) USB_CHAN_MIXER;
+ strcpy(usb_mixers->audChannelMap.map[usb_mixers->audChannelMap.numInputs].name, usb_mixers->usb_mixer[i].output_names[j]);
+ usb_mixers->audChannelMap.numInputs = usb_mixers->audChannelMap.numInputs +1;
+
+ usb_mixers->usbChannelMap.map[usb_mixers->usbChannelMap.numInputs].ctype = (enum usb_chan_type) USB_CHAN_MIXER;
+ strcpy(usb_mixers->usbChannelMap.map[usb_mixers->usbChannelMap.numInputs].name, usb_mixers->usb_mixer[i].output_names[j]);
+ usb_mixers->usbChannelMap.numInputs = usb_mixers->usbChannelMap.numInputs +1;
+ }
+ }
+
+ if(h)
+ {
+ /* Populate mixer input strings */
+ for(int i = 0; i < usb_mixers->num_usb_mixers; i++)
+ {
+ mixer_update_all_nodes(i);
+
+ /* Get current each mixer input and populate channel number state and strings from device */
+ for (int j = 0; j < usb_mixers->usb_mixSel[i].numOutputs; j++)
+ {
+ /* Get value from device */
+ int inputChan = get_mixsel_value(i, j);
+
+ usb_mixers->usb_mixSel[i].state[j] = inputChan;
+
+ /* Look up channel string */
+ strcpy(usb_mixers->usb_mixer[i].input_names[j], usb_mixers->usb_mixSel[i].inputStrings[inputChan]);
+ }
+ }
+ }
+ }
+
+ return h ? 0 : -1;
+}
+
+// End of libusb interface functions
+
+int usb_mixer_connect() {
+ int result = 0;
+
+ gDrvApi.LoadByGUID("{E5A2658B-817D-4A02-A1DE-B628A93DDF5D}", false);
+
+
+ // Allocate internal storage
+ usb_mixers = (usb_mixer_handle *)malloc(sizeof(usb_mixer_handle));
+ memset(usb_mixers, 0, sizeof(usb_mixer_handle));
+
+ // enumerate devices
+ TUsbAudioStatus st = TUSBAUDIO_EnumerateDevices();
+ if ( TSTATUS_SUCCESS != st ) {
+ return USB_MIXER_FAILURE;
+ }
+
+ result = find_xmos_device(0);
+ if (result < 0) {
+ return USB_MIXER_FAILURE;
+ }
+
+ return USB_MIXER_SUCCESS;
+}
+
+int usb_mixer_disconnect() {
+ if ( 0 != h ) {
+ TUSBAUDIO_CloseDevice(h);
+ }
+
+ free(usb_mixers);
+
+ return USB_MIXER_SUCCESS;
+}
+
+/* Getter for num_usb_mixers */
+int usb_mixer_get_num_mixers()
+{
+ return usb_mixers->num_usb_mixers;
+}
+
+int usb_mixer_get_num_outputs(unsigned int mixer)
+{
+ return usb_mixers->usb_mixer[mixer].num_outputs;
+}
+
+int usb_mixer_get_num_inputs(unsigned int mixer)
+{
+ return usb_mixers->usb_mixer[mixer].num_inputs;
+}
+
+int usb_mixer_get_layout(unsigned int mixer, unsigned int *inputs, unsigned int *outputs) {
+ *inputs = usb_mixers->usb_mixer[mixer].num_inputs;
+ *outputs = usb_mixers->usb_mixer[mixer].num_outputs;
+ return 0;
+}
+
+/* MixSel getters and setters */
+char *usb_mixsel_get_input_string(unsigned int mixer, unsigned int input)
+{
+ return usb_mixers->usb_mixSel[mixer].inputStrings[input];
+}
+
+int usb_mixsel_get_input_count(unsigned int mixer)
+{
+ return usb_mixers->usb_mixSel[mixer].numInputs;
+}
+
+int usb_mixsel_get_output_count(unsigned int mixer)
+{
+ return usb_mixers->usb_mixSel[mixer].numOutputs;
+}
+
+char *usb_mixer_get_input_name(unsigned int mixer, unsigned int input) {
+ return usb_mixers->usb_mixer[mixer].input_names[input];
+}
+
+char *usb_mixer_get_output_name(unsigned int mixer, unsigned int output) {
+ return usb_mixers->usb_mixer[mixer].output_names[output];
+}
+
+unsigned char usb_mixsel_get_state(unsigned int mixer, unsigned int channel)
+{
+ return usb_mixers->usb_mixSel[mixer].state[channel];
+}
+
+void usb_mixsel_set_state(unsigned int mixer, unsigned int dst, unsigned int src)
+{
+ // write to device
+ usb_audio_class_set(CUR, CS_XU_SEL, dst, usb_mixers->usb_mixSel[mixer].id, 1, (unsigned char *)&src);
+
+ // update object state
+ usb_mixers->usb_mixSel[mixer].state[dst] = src;
+
+ // update local object strings
+ // TODO we don't really need to store strings since we can look them up...*/
+ strcpy(usb_mixers->usb_mixer[mixer].input_names[dst], usb_mixers->usb_mixSel[mixer].inputStrings[src]);
+}
+
+double usb_mixer_get_value(unsigned int mixer, unsigned int nodeId)
+{
+ return (double)usb_mixers->usb_mixer[mixer].nodes[nodeId].weight;
+}
+
+double usb_mixer_get_res(unsigned int mixer, unsigned int nodeId)
+{
+ return (double)usb_mixers->usb_mixer[mixer].nodes[nodeId].res;
+}
+
+double usb_mixer_get_min(unsigned int mixer, unsigned int nodeId)
+{
+ return (double)usb_mixers->usb_mixer[mixer].nodes[nodeId].min;
+}
+
+double usb_mixer_get_max(unsigned int mixer, unsigned int nodeId)
+{
+ return (double)usb_mixers->usb_mixer[mixer].nodes[nodeId].max;
+}
+
+int usb_mixer_set_value(unsigned int mixer, unsigned int nodeId, double val)
+{
+ /* check if update required */
+ if(usb_mixers->usb_mixer[mixer].nodes[nodeId].weight != val)
+ {
+ /* update local object */
+ usb_mixers->usb_mixer[mixer].nodes[nodeId].weight= val;
+
+ /* write to device */
+ short value = (short) (val * 256);
+
+ usb_audio_class_set(CUR, 1, 1<<8 | nodeId & 0xff, usb_mixers->usb_mixer[mixer].id, 2, (unsigned char *)&value);
+
+ }
+ return 0;
+}
+
+int usb_mixer_get_range(unsigned int mixer, unsigned int mixer_unit, int *min, int *max, int *res)
+{
+ // range 0x02
+ return 0;
+}
+
+int usb_get_usb_channel_map(int channel)
+{
+ return usb_mixers->usbChannelMap.map[channel].cur;
+}
+
+int usb_get_aud_channel_map(int channel)
+{
+ return usb_mixers->audChannelMap.map[channel].cur;
+}
+
+int usb_set_aud_channel_map(int channel, int val)
+{
+ /* Check if update required */
+ if(usb_mixers->audChannelMap.map[channel].cur != val)
+ {
+ /* Update local object */
+ usb_mixers->audChannelMap.map[channel].cur = val;
+
+ /* Write setting to dev */
+ dev_set_channel_map(channel, val, ID_XU_OUT);
+ }
+ return 0;
+}
+
+int usb_set_usb_channel_map(int channel, int val)
+{
+ /* Check if update required */
+ if(usb_mixers->usbChannelMap.map[channel].cur != val)
+ {
+ /* Update local object */
+ usb_mixers->usbChannelMap.map[channel].cur = val;
+
+ /* Write setting to dev */
+ dev_set_channel_map(channel, val, ID_XU_IN);
+ }
+ return 0;
+}
+
+enum usb_chan_type usb_get_aud_channel_map_type(int channel)
+{
+ return usb_mixers->audChannelMap.map[channel].ctype;
+}
+
+enum usb_chan_type usb_get_usb_channel_map_type(int channel)
+{
+ return usb_mixers->usbChannelMap.map[channel].ctype;
+}
+
+char *usb_get_aud_channel_map_name(int channel)
+{
+ return usb_mixers->audChannelMap.map[channel].name;
+}
+
+char *usb_get_usb_channel_map_name(int channel)
+{
+ return usb_mixers->usbChannelMap.map[channel].name;
+}
+
+int usb_get_aud_channel_map_num_outputs()
+{
+ return usb_mixers->audChannelMap.numOutputs;
+}
+int usb_get_usb_channel_map_num_outputs()
+{
+ return usb_mixers->usbChannelMap.numOutputs;
+}
+
+int usb_get_aud_channel_map_num_inputs()
+{
+ return usb_mixers->audChannelMap.numInputs;
+}
+int usb_get_usb_channel_map_num_inputs()
+{
+ return usb_mixers->usbChannelMap.numInputs;
+}
+
diff --git a/host_usb_mixer_control/mixer_app.cpp b/host_usb_mixer_control/mixer_app.cpp
new file mode 100644
index 00000000..5736ae3e
--- /dev/null
+++ b/host_usb_mixer_control/mixer_app.cpp
@@ -0,0 +1,721 @@
+// Copyright 2022-2023 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+#include
+#include
+#include
+#include "usb_mixer.h"
+
+#define MIXER_UNIT_DISPLAY_VALUE 2
+#define MIXER_UNIT_DISPLAY_MIN 3
+#define MIXER_UNIT_DISPLAY_MAX 4
+#define MIXER_UNIT_DISPLAY_RES 5
+
+// TODO
+// res, min, max
+
+int mixer_init(void)
+{
+ /* Open the connection to the USB mixer */
+ if (usb_mixer_connect() == USB_MIXER_FAILURE)
+ {
+ return USB_MIXER_FAILURE;
+ }
+
+
+ return USB_MIXER_SUCCESS;
+}
+
+int mixer_deinit(void) {
+ // Close the connection to the USB mixer
+ if (usb_mixer_disconnect() == USB_MIXER_FAILURE) {
+ return USB_MIXER_FAILURE;
+ }
+
+ return USB_MIXER_SUCCESS;
+}
+
+int mixer_display(unsigned int mixer_index, unsigned int type) {
+ int i = 0;
+ int j = 0;
+
+ int num_inputs = usb_mixer_get_num_inputs(mixer_index);
+ int num_outputs = usb_mixer_get_num_outputs(mixer_index);
+
+
+ printf("\n");
+ switch (type) {
+ case MIXER_UNIT_DISPLAY_VALUE:
+ //mixer_update_all_values(mixer_index);
+ printf(" Mixer Values (%d)\n", mixer_index);
+ printf(" ----------------\n\n");
+ break;
+ case MIXER_UNIT_DISPLAY_MIN:
+ printf(" Mixer Ranges Min (%d)\n", mixer_index);
+ printf(" --------------------\n\n");
+ break;
+ case MIXER_UNIT_DISPLAY_MAX:
+ printf(" Mixer Ranges Max (%d)\n", mixer_index);
+ printf(" --------------------\n\n");
+ break;
+ case MIXER_UNIT_DISPLAY_RES:
+ printf(" Mixer Ranges Res (%d)\n", mixer_index);
+ printf(" --------------------\n\n");
+ break;
+ default:
+ return USB_MIXER_FAILURE;
+ break;
+ }
+
+ printf(" \t\t\t");
+ printf("Mixer Outputs\n");
+ printf("\t\t ");
+ for (i = 0; i < num_outputs; i++) {
+ printf(" %d", i+1);
+ }
+ printf("\n");
+ for (i = 0; i < num_inputs; i++) {
+ printf(" %-20s", usb_mixer_get_input_name(mixer_index,i));
+ for (j = 0; j < num_outputs; j++) {
+ switch (type) {
+ case MIXER_UNIT_DISPLAY_VALUE:
+ {
+ double mixNodeVal = usb_mixer_get_value(mixer_index, (i*num_outputs)+j);
+ int nodeid = (i*num_outputs)+j;
+
+ if (mixNodeVal <= -127.996)// todo shoud be < min
+ {
+ printf("\t%3d:[ %s ]", nodeid,"-inf");
+ }
+ else
+ {
+ printf("\t%3d:[%08.03f]", nodeid, mixNodeVal);
+ }
+ }
+ break;
+ case MIXER_UNIT_DISPLAY_MIN:
+ {
+ int nodeid = (i*num_outputs)+j;
+ printf("\t%3d:[%08.03f]", nodeid, usb_mixer_get_min(mixer_index, (i*num_outputs)+j)) ;
+ }
+ break;
+ case MIXER_UNIT_DISPLAY_MAX:
+ {
+ int nodeid = (i*num_outputs)+j;
+ printf("\t%3d:[%08.03f]", nodeid, usb_mixer_get_max(mixer_index, (i*num_outputs)+j)) ;
+ }
+ break;
+ case MIXER_UNIT_DISPLAY_RES:
+ {
+ int nodeid = (i*num_outputs)+j;
+ printf("\t%3d:[%08.03f]", nodeid, usb_mixer_get_res(mixer_index, (i*num_outputs)+j)) ;
+ }
+ break;
+ default:
+ return USB_MIXER_FAILURE;
+ break;
+ }
+ }
+ printf("\n");
+ }
+ printf("\n");
+
+ return USB_MIXER_SUCCESS;
+}
+
+/* Displays basic mixer information */
+int mixer_display_info(void)
+{
+ unsigned int i = 0;
+ int num_mixers = usb_mixer_get_num_mixers();
+
+ printf("\n");
+ printf(" Mixer Info\n");
+ printf(" ----------\n\n");
+ printf(" Mixers : %d\n\n", num_mixers);
+
+ for (i = 0; i < num_mixers; i++)
+ {
+ int num_inputs = usb_mixer_get_num_inputs(i);
+ int num_outputs = usb_mixer_get_num_outputs(i);
+
+
+ printf(" Mixer %d\n", i);
+ printf(" -------\n");
+
+ printf(" Inputs : %d\n"
+ " Outputs : %d\n\n", num_inputs, num_outputs);
+
+ printf(" Mixer Output Labels:\n");
+ for(int j = 0; j < num_outputs; j++)
+ {
+ printf(" %d: %s\n", j,usb_mixer_get_output_name(i,j));
+ }
+
+ //printf("\n Selectable Inputs (%d): \n", usb_mixsel_get_input_count(i));
+ //for(int j = 0; j < usb_mixsel_get_input_count(i); j++)
+ //{
+ // printf(" %d: %s\n", j, usb_mixsel_get_input_string(i,j));
+ //}
+ }
+
+ printf("\n");
+
+ return USB_MIXER_SUCCESS;
+}
+
+void display_available_mixer_sources(int mixIndex)
+{
+ printf("\n");
+ printf(" Available Mixer Sources (%d)\n", mixIndex);
+ printf(" -------------------------\n\n");
+
+ for(int j = 0; j < usb_mixsel_get_input_count(mixIndex); j++)
+ {
+ printf(" %d: %s\n", j, usb_mixsel_get_input_string(mixIndex,j));
+ }
+}
+
+
+/* Gets the current mixer inputs from the device an displays them */
+void display_mixer_sources(int mixerIndex)
+{
+ printf("\n");
+ printf(" Current Mixer Sources (%d)\n", mixerIndex);
+ printf(" -------------------------\n\n");
+
+ /* Note, mixSel output cound and mixer input chan count should be the same! */
+ printf(" Number of mixer sources: %d\n", usb_mixsel_get_output_count(mixerIndex));
+
+ /* Get the current channel number for every mixer input */
+ for(int i = 0; i < usb_mixsel_get_output_count(mixerIndex); i++)
+ {
+ int inputChan = (int)usb_mixsel_get_state(mixerIndex, i);
+ char *str = usb_mixer_get_input_name(mixerIndex,i);
+ printf(" Mixer input %d: Source chan id: %d (%s)\n", i, inputChan, str);
+ }
+}
+
+/* set mixer source */
+void set_mixer_source(unsigned mixerIndex, unsigned dst, unsigned src)
+{
+ usb_mixsel_set_state(mixerIndex, dst, src);
+
+ /* String lookup */
+ char *str = usb_mixer_get_input_name(mixerIndex, dst);
+ int state = usb_mixsel_get_state(mixerIndex, dst);
+
+ printf("\n Set mixer(%d) input %d to device input %d (%s)\n", mixerIndex, dst, state, str);
+}
+
+void display_aud_channel_map()
+{
+ printf("\n");
+ printf(" Audio Output Channel Map\n");
+ printf(" ------------------------\n\n");
+
+ for (int i=0;i>8), offset&0xff, unitId, data);
+}
+
+void print_levels(const char* levelTitle, unsigned char* levels, int levelBytes)
+{
+ unsigned levelCount = levelBytes/2;
+ unsigned short* levelData = (unsigned short*) levels;
+
+ printf("\n %s Level Data\n"
+ " ----------------------\n\n"
+ "%d bytes (%d channels) returned:\n"
+ , levelTitle, levelBytes, levelCount);
+
+ for(int i = 0; i