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The audio i/o core now uses "underflow" sample as it's request word (i.e. different for PCM/DSD). This gets passed all the way through mixer and on to decouple such that it can be used in the underflow state. This allows the removal of the communication of the underflow state to the audio i/o core from decouple and thus "stand-alone" mixer now works again.

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This commit is contained in:
Ross Owen
2015-03-20 17:23:24 +00:00
parent 8938dc7afc
commit 7cd5631e4b
3 changed files with 74 additions and 114 deletions
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19
module_usb_audio/usb_buffer/decouple.xc
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@@ -129,10 +129,9 @@ void handle_audio_request(chanend c_mix_out)
int space_left;
/* Input word that triggered interrupt and handshake back */
(void) inuint(c_mix_out);
/* Reply with underflow */
outuint(c_mix_out, outUnderflow);
unsigned underflowSample = inuint(c_mix_out);
outuint(c_mix_out, 0);
/* If in overflow condition then receive samples and throw away */
if(inOverflow || sampsToWrite == 0)
@@ -290,21 +289,11 @@ __builtin_unreachable();
if(outUnderflow)
{
#pragma xta endpoint "out_underflow"
#if 0
/* We're still pre-buffering, send out 0 samps */
for(int i = 0; i < NUM_USB_CHAN_OUT; i++)
{
unsigned sample;
unsigned mode;
GET_SHARED_GLOBAL(sample, g_muteSample);
GET_SHARED_GLOBAL(mode, dsdMode);
if(mode == DSD_MODE_DOP)
outuint(c_mix_out, 0xFA969600);
else
outuint(c_mix_out, sample);
outuint(c_mix_out, underflowSample);
}
#endif
/* Calc how many samples left in buffer */
outSamps = g_aud_from_host_wrptr - g_aud_from_host_rdptr;