From 18433c19b690432179e9a0ed83eff611f5cecc67 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Fri, 24 Jul 2009 13:45:59 +0200 Subject: [PATCH] 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 --- src/modules/alsa/alsa-sink.c | 22 ++++++++++++++++++---- src/modules/alsa/alsa-source.c | 28 +++++++++++++++++++++------- 2 files changed, 39 insertions(+), 11 deletions(-) diff --git a/src/modules/alsa/alsa-sink.c b/src/modules/alsa/alsa-sink.c index e792590..46562cb 100644 --- a/src/modules/alsa/alsa-sink.c +++ b/src/modules/alsa/alsa-sink.c @@ -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; diff --git a/src/modules/alsa/alsa-source.c b/src/modules/alsa/alsa-source.c index 41bb768..8a1fbe5 100644 --- a/src/modules/alsa/alsa-source.c +++ b/src/modules/alsa/alsa-source.c @@ -391,6 +391,7 @@ static int mmap_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled snd_pcm_sframes_t n; size_t n_bytes; int r; + pa_bool_t after_avail = TRUE; if (PA_UNLIKELY((n = pa_alsa_safe_avail(u->pcm_handle, u->hwbuf_size, &u->source->sample_spec)) < 0)) { @@ -463,6 +464,9 @@ static int mmap_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled if (PA_UNLIKELY((err = pa_alsa_safe_mmap_begin(u->pcm_handle, &areas, &offset, &frames, u->hwbuf_size, &u->source->sample_spec)) < 0)) { + if (!after_avail && err == -EAGAIN) + break; + if ((r = try_recover(u, "snd_pcm_mmap_begin", err)) == 0) continue; @@ -473,9 +477,12 @@ static int mmap_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled if (frames > pa_mempool_block_size_max(u->source->core->mempool)/u->frame_size) frames = pa_mempool_block_size_max(u->source->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); @@ -542,6 +549,7 @@ static int unix_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled snd_pcm_sframes_t n; size_t n_bytes; int r; + pa_bool_t after_avail = TRUE; if (PA_UNLIKELY((n = pa_alsa_safe_avail(u->pcm_handle, u->hwbuf_size, &u->source->sample_spec)) < 0)) { @@ -602,20 +610,26 @@ static int unix_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled frames = snd_pcm_readi(u->pcm_handle, (uint8_t*) p, (snd_pcm_uframes_t) frames); pa_memblock_release(chunk.memblock); - if (frames == 0) { - pa_memblock_unref(chunk.memblock); - break; - } - if (PA_UNLIKELY(frames < 0)) { pa_memblock_unref(chunk.memblock); - if ((r = try_recover(u, "snd_pcm_readi", (int) (frames))) == 0) + if (!after_avail && (int) frames == -EAGAIN) + break; + + if ((r = try_recover(u, "snd_pcm_readi", (int) frames)) == 0) continue; return r; } + if (!after_avail && frames == 0) { + pa_memblock_unref(chunk.memblock); + break; + } + + pa_assert(frames > 0); + after_avail = FALSE; + chunk.index = 0; chunk.length = (size_t) frames * u->frame_size; -- 2.7.4