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ALSA: Another attempt at fixing mmap mode.

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David Reid
2017-11-07 19:39:47 +10:00
parent 11a7731372
commit 4c434f1591
1 changed files with 29 additions and 27 deletions
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mini_al.h
+29 -27
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@@ -5102,27 +5102,9 @@ static mal_uint32 mal_device__wait_for_frames__alsa(mal_device* pDevice, mal_boo
mal_uint32 periodSizeInFrames = pDevice->bufferSizeInFrames / pDevice->periods; mal_uint32 periodSizeInFrames = pDevice->bufferSizeInFrames / pDevice->periods;
while (!pDevice->alsa.breakFromMainLoop) { while (!pDevice->alsa.breakFromMainLoop) {
snd_pcm_sframes_t framesAvailable = ((mal_snd_pcm_avail_update_proc)pDevice->pContext->alsa.snd_pcm_avail_update)((snd_pcm_t*)pDevice->alsa.pPCM); // Wait for something to become available. The timeout should not affect latency - it's only used to break from the wait
// so we can check whether or not the device has been stopped.
// Keep the returned number of samples consistent and based on the period size. const int timeoutInMilliseconds = 10;
if (framesAvailable >= periodSizeInFrames) {
return periodSizeInFrames;
}
if (framesAvailable < 0) {
if (framesAvailable == -EPIPE) {
if (((mal_snd_pcm_recover_proc)pDevice->pContext->alsa.snd_pcm_recover)((snd_pcm_t*)pDevice->alsa.pPCM, framesAvailable, MAL_TRUE) < 0) {
return 0;
}
framesAvailable = ((mal_snd_pcm_avail_update_proc)pDevice->pContext->alsa.snd_pcm_avail_update)((snd_pcm_t*)pDevice->alsa.pPCM);
if (framesAvailable < 0) {
return 0;
}
}
}
const int timeoutInMilliseconds = 1; // <-- The larger this value, the longer it'll take to stop the device!
int waitResult = ((mal_snd_pcm_wait_proc)pDevice->pContext->alsa.snd_pcm_wait)((snd_pcm_t*)pDevice->alsa.pPCM, timeoutInMilliseconds); int waitResult = ((mal_snd_pcm_wait_proc)pDevice->pContext->alsa.snd_pcm_wait)((snd_pcm_t*)pDevice->alsa.pPCM, timeoutInMilliseconds);
if (waitResult < 0) { if (waitResult < 0) {
if (waitResult == -EPIPE) { if (waitResult == -EPIPE) {
@@ -5130,15 +5112,35 @@ static mal_uint32 mal_device__wait_for_frames__alsa(mal_device* pDevice, mal_boo
return 0; return 0;
} }
if (pRequiresRestart) { if (pRequiresRestart) *pRequiresRestart = MAL_TRUE; // A device recovery means a restart for mmap mode.
*pRequiresRestart = MAL_TRUE; }
}
if (pDevice->alsa.breakFromMainLoop) {
return 0;
}
snd_pcm_sframes_t framesAvailable = ((mal_snd_pcm_avail_update_proc)pDevice->pContext->alsa.snd_pcm_avail_update)((snd_pcm_t*)pDevice->alsa.pPCM);
if (framesAvailable < 0) {
if (framesAvailable == -EPIPE) {
if (((mal_snd_pcm_recover_proc)pDevice->pContext->alsa.snd_pcm_recover)((snd_pcm_t*)pDevice->alsa.pPCM, framesAvailable, MAL_TRUE) < 0) {
return 0;
} }
return pDevice->bufferSizeInFrames; if (pRequiresRestart) *pRequiresRestart = MAL_TRUE; // A device recovery means a restart for mmap mode.
} else {
return 0; // Try again, but if it fails this time just return an error.
framesAvailable = ((mal_snd_pcm_avail_update_proc)pDevice->pContext->alsa.snd_pcm_avail_update)((snd_pcm_t*)pDevice->alsa.pPCM);
if (framesAvailable < 0) {
return 0;
}
} }
} }
// Keep the returned number of samples consistent and based on the period size.
if (framesAvailable >= periodSizeInFrames) {
return periodSizeInFrames;
}
} }
// We'll get here if the loop was terminated. Just return whatever's available. // We'll get here if the loop was terminated. Just return whatever's available.
@@ -5161,7 +5163,7 @@ static mal_bool32 mal_device_write__alsa(mal_device* pDevice)
} }
if (pDevice->alsa.pIntermediaryBuffer == NULL) { if (pDevice->alsa.isUsingMMap) {
// mmap. // mmap.
mal_bool32 requiresRestart; mal_bool32 requiresRestart;
mal_uint32 framesAvailable = mal_device__wait_for_frames__alsa(pDevice, &requiresRestart); mal_uint32 framesAvailable = mal_device__wait_for_frames__alsa(pDevice, &requiresRestart);