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fix for aud_to_host buffer underflow seen in 44_48 adat input tests

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This commit is contained in:
Shuchita Khare
2024-05-13 09:40:33 +01:00
parent ad91d19f94
commit ac0e1ebe7b
1 changed files with 22 additions and 3 deletions
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25
lib_xua/src/core/buffer/decouple/decouple.xc
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@@ -42,8 +42,13 @@
#define MAX_DEVICE_AUD_PACKET_SIZE_OUT (MAX(MAX_DEVICE_AUD_PACKET_SIZE_OUT_FS, MAX_DEVICE_AUD_PACKET_SIZE_OUT_HS))
/*** BUFFER SIZES ***/
#define BUFFER_PACKET_COUNT (4) /* How many packets too allow for in buffer - minimum is 4 */
/* How many packets too allow for in buffer - minimum is 5.
2 for having in the aud_to_host buffer when it comes out of underflow, space available for 2 more for to accomodate cases when
2 pkts from audio hub get written into the aud_to_host buffer within 1 SOF period, and space for 1 extra packet to ensure that
when the 4th packet gets written to the buffer, there's space to accomodate the next packet, otherwise handle_audio_request() will
drop packets after writing the 4th packet in the buffer
*/
#define BUFFER_PACKET_COUNT (5)
#define BUFF_SIZE_OUT_HS MAX_DEVICE_AUD_PACKET_SIZE_OUT_HS * BUFFER_PACKET_COUNT
#define BUFF_SIZE_OUT_FS MAX_DEVICE_AUD_PACKET_SIZE_OUT_FS * BUFFER_PACKET_COUNT
@@ -1054,7 +1059,21 @@ void XUA_Buffer_Decouple(chanend c_mix_out
assert(fillLevel <= BUFF_SIZE_IN);
/* Check if we have come out of underflow */
if (fillLevel >= IN_BUFFER_PREFILL)
unsigned sampFreq;
GET_SHARED_GLOBAL(sampFreq, g_freqChange_sampFreq);
int min, mid, max;
GetADCCounts(sampFreq, min, mid, max);
const int min_pkt_size = ((min * g_curSubSlot_In * g_numUsbChan_In + 3) & ~0x3) + 4;
/*
Come out of underflow if there are exactly 2 packets in the buffer.
This ensures that handle_audio_request() does not drop packets when writing packets into the aud_to_host buffer
when aud_to_host buffer is not in underflow.
For example, coming out of underflow with 3 packets in the buffer would mean handle_audio_request()
drops packets if 2 pkts are received from audio hub in 1 SOF period. Coming out of underflow with 4
packets would mean handle_audio_request would drop packets after writing 1 packet to the aud_to_host buffer.
*/
if ((fillLevel >= (min_pkt_size*2)) && (fillLevel < (min_pkt_size*3)))
{
int aud_to_host_rdptr;
GET_SHARED_GLOBAL(aud_to_host_rdptr, g_aud_to_host_rdptr);