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alsa: limit the size we copy to min_avail

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This commit is contained in:
Wim Taymans 2017-11-14 18:00:55 +01:00
parent f4ab376a08
commit 4270e867ed
1 changed files with 10 additions and 8 deletions
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12
alsa-plugins/pcm_pipewire.c
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@ -204,12 +204,13 @@ snd_pcm_pipewire_process(snd_pcm_pipewire_t *pw, struct buffer *b)
const snd_pcm_channel_area_t *areas;
snd_pcm_channel_area_t *pwareas;
snd_pcm_uframes_t xfer = 0;
unsigned int channel, bps;
unsigned int channel, bps, bpf;
snd_pcm_uframes_t nframes;
uint32_t index = 0, nbytes, maxsize, avail;
void *ptr;
bps = io->channels * pw->sample_bits;
bpf = bps / 8;
pwareas = alloca(io->channels * sizeof(snd_pcm_channel_area_t));
@ -222,20 +223,21 @@ snd_pcm_pipewire_process(snd_pcm_pipewire_t *pw, struct buffer *b)
filled = spa_ringbuffer_get_write_index(&b->rb->ringbuffer, &index);
avail = b->rb->ringbuffer.size - filled;
offset = index % b->rb->ringbuffer.size;
nbytes = SPA_MIN(avail, b->rb->ringbuffer.size - offset);
nbytes = SPA_MIN(nbytes, pw->min_avail);
avail = SPA_MIN(avail, b->rb->ringbuffer.size - offset);
avail = SPA_MIN(avail, pw->min_avail * bpf);
nbytes = avail;
ptr = SPA_MEMBER(b->ptr, offset, void);
pw_log_trace("%d %d %d %d %p", nbytes, avail, filled, offset, ptr);
}
else {
avail = b->buffer->datas[0].chunk->size;
avail = SPA_MIN(avail, pw->min_avail * bpf);
maxsize = b->buffer->datas[0].maxsize;
nbytes = SPA_MIN(avail, maxsize);
ptr = b->ptr;
}
nframes = nbytes / (bps / 8);
nframes = SPA_MIN(nframes, pw->min_avail);
nframes = nbytes / bpf;
for (channel = 0; channel < io->channels; channel++) {
pwareas[channel].addr = ptr;