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alsa-pcm: use headroom to calculate minimum available frames for non time scheduling

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Alsa needs to call handler soon enough to have headroom plus threshold
frames in the buffer and not only threshold left.

Signed-off-by: Martin Geier <martin.geier@streamunlimited.com>
This commit is contained in:
Martin Geier 2024-03-27 11:56:12 +01:00 committed by Wim Taymans
parent b4ed8dcf14
commit 1e6dad14d3
1 changed files with 4 additions and 3 deletions
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7
spa/plugins/alsa/alsa-pcm.c
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@ -2336,14 +2336,15 @@ static int set_swparams(struct state *state)
CHECK(snd_pcm_sw_params_set_start_threshold(hndl, params, LONG_MAX), "set_start_threshold");
if (state->disable_tsched) {
snd_pcm_uframes_t avail_min;
snd_pcm_uframes_t avail_min = 0;
if (state->stream == SND_PCM_STREAM_PLAYBACK) {
/* wake up when buffer has target frames or less data (will underrun soon) */
avail_min = state->buffer_frames - state->threshold;
if (state->buffer_frames >= (state->threshold + state->headroom))
avail_min = state->buffer_frames - (state->threshold + state->headroom);
} else {
/* wake up when there's target frames or more (enough for us to read and push a buffer) */
avail_min = state->threshold;
avail_min = SPA_MIN(state->threshold + state->headroom, state->buffer_frames);
}
CHECK(snd_pcm_sw_params_set_avail_min(hndl, params, avail_min), "set_avail_min");