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alsa: write silence in smaller chunks

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With large quantum and many channels, the silence buffer can become
quite large (many MB), which can cause a stack overflow.

Use a fixed size silence buffer instead and write in smaller chunks.
This commit is contained in:
Wim Taymans 2026-05-08 17:43:23 +02:00
parent 0ac3cf3c88
commit 6c0a9b31f6
1 changed files with 15 additions and 9 deletions
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24
spa/plugins/alsa/alsa-pcm.c
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@ -2687,16 +2687,22 @@ static int spa_alsa_silence(struct state *state, snd_pcm_uframes_t silence)
return res;
}
} else {
uint8_t buffer[silence * state->frame_size];
memset(buffer, 0, silence * state->frame_size);
uint8_t buffer[1024 * 4];
void *bufs[state->channels];
snd_pcm_uframes_t chunk, remaining = silence;
snd_pcm_uframes_t max = sizeof(buffer) / state->frame_size;
if (state->planar) {
void *bufs[state->channels];
for (i = 0; i < state->channels; i++)
bufs[i] = buffer;
snd_pcm_writen(hndl, bufs, silence);
} else {
snd_pcm_writei(hndl, buffer, silence);
memset(buffer, 0, sizeof(buffer));
for (i = 0; i < state->channels; i++)
bufs[i] = buffer;
while (remaining > 0) {
chunk = SPA_MIN(remaining, max);
if (state->planar)
snd_pcm_writen(hndl, bufs, chunk);
else
snd_pcm_writei(hndl, buffer, chunk);
remaining -= chunk;
}
}
return 0;