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alsa: rework batch handling a bit

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By default, use a 512 period for batch and use 512 headroom
Add a property to disable special batch handling.
This commit is contained in:
Wim Taymans 2021-01-21 17:10:48 +01:00
parent af092a9a7e
commit 73896bfa83
5 changed files with 28 additions and 31 deletions
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29
spa/plugins/alsa/alsa-pcm.c
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@ -584,47 +584,38 @@ int spa_alsa_set_format(struct state *state, struct spa_audio_info *fmt, uint32_
dir = 0;
period_size = state->default_period_size ? state->default_period_size : 1024;
is_batch = snd_pcm_hw_params_is_batch(params);
if (is_batch) {
const char *id;
snd_pcm_info_t* pcm_info;
snd_pcm_info_alloca(&pcm_info);
if (snd_pcm_info(hndl, pcm_info) == 0 &&
(id = snd_pcm_info_get_id(pcm_info)) != NULL) {
/* usb devices have low enough transfer size */
if (strcmp(id, "USB Audio") == 0)
is_batch = false;
}
}
is_batch = snd_pcm_hw_params_is_batch(params) &&
!state->disable_batch;
if (is_batch) {
/* batch devices get their hw pointers updated every period. Make
* the period smaller and add one period of headroom */
period_size /= 2;
spa_log_info(state->log, NAME" %s: batch mode, period_size:%ld",
state->props.device, period_size);
state->props.device, period_size);
}
CHECK(snd_pcm_hw_params_set_period_size_near(hndl, params, &period_size, &dir), "set_period_size_near");
CHECK(snd_pcm_hw_params_get_buffer_size_max(params, &state->buffer_frames), "get_buffer_size_max");
CHECK(snd_pcm_hw_params_set_buffer_size_near(hndl, params, &state->buffer_frames), "set_buffer_size_near");
if (state->default_headroom == 0)
state->headroom = is_batch ? period_size : 0;
else
state->headroom = state->default_headroom;
state->headroom = state->default_headroom;
if (is_batch)
state->headroom += period_size;
state->period_frames = period_size;
periods = state->buffer_frames / state->period_frames;
spa_log_info(state->log, NAME" %s (%s): format:%s access:%s-%s rate:%d channels:%d "
"buffer frames %lu, period frames %lu, periods %u, frame_size %zd",
"buffer frames %lu, period frames %lu, periods %u, frame_size %zd"
"headroom %u",
state->props.device,
state->stream == SND_PCM_STREAM_CAPTURE ? "capture" : "playback",
snd_pcm_format_name(state->format),
state->use_mmap ? "mmap" : "rw",
planar ? "planar" : "interleaved",
state->rate, state->channels, state->buffer_frames, state->period_frames,
periods, state->frame_size);
periods, state->frame_size, state->headroom);
/* write the parameters to device */
CHECK(snd_pcm_hw_params(hndl, params), "set_hw_params");