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alsa-plugin: use ioplug sw_params callback

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snd_pcm_sw_params states "The software parameters can be changed at
any time.". Adding the ioplug callback sw_params to get relevant
updates, and if min_avail has changed update the node latency of
the stream.

Ignoring callback received prior to prepare as stream not yet created.
This commit is contained in:
Robert Rosengren 2022-05-13 16:26:33 +02:00 • committed by Wim Taymans
parent 98aa7ccff0
commit cd389240fa
1 changed files with 31 additions and 0 deletions
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31
pipewire-alsa/alsa-plugins/pcm_pipewire.c
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@ -721,6 +721,36 @@ static int snd_pcm_pipewire_hw_params(snd_pcm_ioplug_t * io,
return 0;
}
static int snd_pcm_pipewire_sw_params(snd_pcm_ioplug_t * io,
snd_pcm_sw_params_t * sw_params)
{
snd_pcm_pipewire_t *pw = io->private_data;
if (pw->stream) {
snd_pcm_uframes_t min_avail;
snd_pcm_sw_params_get_avail_min( sw_params, &min_avail);
snd_pcm_sw_params_get_boundary(sw_params, &pw->boundary);
if (min_avail != pw->min_avail) {
char *latency;
struct spa_dict_item item[1];
uint32_t min_period = (MIN_PERIOD * io->rate / 48000);
pw->min_avail = SPA_MAX(min_avail, min_period);
latency = spa_aprintf("%lu/%u", pw->min_avail, io->rate);
item[0] = SPA_DICT_ITEM_INIT(PW_KEY_NODE_LATENCY, latency);
pw_log_debug("%p: sw_params update props %p %ld", pw, pw->stream, pw->min_avail);
pw_stream_update_properties(pw->stream, &SPA_DICT_INIT(item, 1));
free(latency);
}
} else {
pw_log_debug("%p: sw_params pre-prepare noop", pw);
}
return 0;
}
struct chmap_info {
enum snd_pcm_chmap_position pos;
enum spa_audio_channel channel;
@ -855,6 +885,7 @@ static snd_pcm_ioplug_callback_t pipewire_pcm_callback = {
.poll_descriptors = snd_pcm_pipewire_poll_descriptors,
.poll_revents = snd_pcm_pipewire_poll_revents,
.hw_params = snd_pcm_pipewire_hw_params,
.sw_params = snd_pcm_pipewire_sw_params,
.set_chmap = snd_pcm_pipewire_set_chmap,
.get_chmap = snd_pcm_pipewire_get_chmap,
.query_chmaps = snd_pcm_pipewire_query_chmaps,