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alsa: handle correctly if alsa returns us 0 or EAGAIN on snd_pcm_mmap_begin if we didn't call snd_pcm_avail immediately before

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This commit is contained in:
Lennart Poettering 2009-07-24 13:45:59 +02:00
parent a81244a726
commit 18433c19b6
2 changed files with 39 additions and 11 deletions
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22
src/modules/alsa/alsa-sink.c
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@ -401,6 +401,7 @@ static int mmap_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
snd_pcm_sframes_t n;
size_t n_bytes;
int r;
pa_bool_t after_avail = TRUE;
/* First we determine how many samples are missing to fill the
* buffer up to 100% */
@ -484,6 +485,9 @@ static int mmap_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
if (PA_UNLIKELY((err = pa_alsa_safe_mmap_begin(u->pcm_handle, &areas, &offset, &frames, u->hwbuf_size, &u->sink->sample_spec)) < 0)) {
if (!after_avail && err == -EAGAIN)
break;
if ((r = try_recover(u, "snd_pcm_mmap_begin", err)) == 0)
continue;
@ -494,9 +498,12 @@ static int mmap_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
if (frames > pa_mempool_block_size_max(u->sink->core->mempool)/u->frame_size)
frames = pa_mempool_block_size_max(u->sink->core->mempool)/u->frame_size;
if (frames == 0)
if (!after_avail && frames == 0)
break;
pa_assert(frames > 0);
after_avail = FALSE;
/* Check these are multiples of 8 bit */
pa_assert((areas[0].first & 7) == 0);
pa_assert((areas[0].step & 7)== 0);
@ -617,6 +624,7 @@ static int unix_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
for (;;) {
snd_pcm_sframes_t frames;
void *p;
pa_bool_t after_avail = TRUE;
/* pa_log_debug("%lu frames to write", (unsigned long) frames); */
@ -634,17 +642,23 @@ static int unix_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
frames = snd_pcm_writei(u->pcm_handle, (const uint8_t*) p + u->memchunk.index, (snd_pcm_uframes_t) frames);
pa_memblock_release(u->memchunk.memblock);
if (frames == 0)
break;
if (PA_UNLIKELY(frames < 0)) {
if (!after_avail && (int) frames == -EAGAIN)
break;
if ((r = try_recover(u, "snd_pcm_writei", (int) frames)) == 0)
continue;
return r;
}
if (!after_avail && frames == 0)
break;
pa_assert(frames > 0);
after_avail = FALSE;
u->memchunk.index += (size_t) frames * u->frame_size;
u->memchunk.length -= (size_t) frames * u->frame_size;