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ALSA: pass the latency test

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See #2
This commit is contained in:
Andrew Kelley 2015-09-03 09:52:21 -07:00
parent d8a7a794d3
commit 1381cf21d3
1 changed files with 24 additions and 3 deletions
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27
src/alsa.cpp
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@ -1036,7 +1036,7 @@ void outstream_thread_run(void *arg) {
} }
case SND_PCM_STATE_PREPARED: case SND_PCM_STATE_PREPARED:
{ {
snd_pcm_sframes_t avail = snd_pcm_avail_update(osa->handle); snd_pcm_sframes_t avail = snd_pcm_avail(osa->handle);
if (avail < 0) { if (avail < 0) {
outstream->error_callback(outstream, SoundIoErrorStreaming); outstream->error_callback(outstream, SoundIoErrorStreaming);
return; return;
@ -1471,7 +1471,18 @@ static int outstream_pause_alsa(struct SoundIoPrivate *si, struct SoundIoOutStre
static int outstream_get_latency_alsa(struct SoundIoPrivate *si, struct SoundIoOutStreamPrivate *os, static int outstream_get_latency_alsa(struct SoundIoPrivate *si, struct SoundIoOutStreamPrivate *os,
double *out_latency) double *out_latency)
{ {
soundio_panic("TODO"); SoundIoOutStream *outstream = &os->pub;
SoundIoOutStreamAlsa *osa = &os->backend_data.alsa;
int err;
snd_pcm_sframes_t delay;
if ((err = snd_pcm_delay(osa->handle, &delay)) < 0) {
fprintf(stderr, "snd_pcm_delay: %s\n", snd_strerror(err));
return SoundIoErrorStreaming;
}
*out_latency = delay / (double)outstream->sample_rate;
return 0;
} }
static void instream_destroy_alsa(SoundIoPrivate *si, SoundIoInStreamPrivate *is) { static void instream_destroy_alsa(SoundIoPrivate *si, SoundIoInStreamPrivate *is) {
@ -1747,7 +1758,17 @@ static int instream_pause_alsa(struct SoundIoPrivate *si, struct SoundIoInStream
static int instream_get_latency_alsa(struct SoundIoPrivate *si, struct SoundIoInStreamPrivate *is, static int instream_get_latency_alsa(struct SoundIoPrivate *si, struct SoundIoInStreamPrivate *is,
double *out_latency) double *out_latency)
{ {
soundio_panic("TODO"); SoundIoInStream *instream = &is->pub;
SoundIoInStreamAlsa *isa = &is->backend_data.alsa;
int err;
snd_pcm_sframes_t delay;
if ((err = snd_pcm_delay(isa->handle, &delay)) < 0) {
return SoundIoErrorStreaming;
}
*out_latency = delay / (double)instream->sample_rate;
return 0;
} }
int soundio_alsa_init(SoundIoPrivate *si) { int soundio_alsa_init(SoundIoPrivate *si) {