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alsa: implement _delay to get smoother timestamps

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Fixes #536
This commit is contained in:
Wim Taymans 2021-01-09 10:50:39 +01:00
parent d1f9966a77
commit 0c2b4df8e5
1 changed files with 27 additions and 2 deletions
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29
pipewire-alsa/alsa-plugins/pcm_pipewire.c
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@ -86,6 +86,7 @@ typedef struct {
struct pw_stream *stream;
struct spa_hook stream_listener;
struct pw_time time;
struct spa_io_rate_match *rate_match;
struct spa_audio_info_raw format;
@ -180,6 +181,28 @@ static snd_pcm_sframes_t snd_pcm_pipewire_pointer(snd_pcm_ioplug_t *io)
#endif
}
static int snd_pcm_pipewire_delay(snd_pcm_ioplug_t *io, snd_pcm_sframes_t *delayp)
{
snd_pcm_pipewire_t *pw = io->private_data;
int64_t elapsed = 0, filled;
if (pw->time.rate.num != 0) {
struct timespec ts;
int64_t diff;
clock_gettime(CLOCK_MONOTONIC, &ts);
diff = SPA_TIMESPEC_TO_NSEC(&ts) - pw->time.now;
elapsed = (pw->time.rate.denom * diff) / (pw->time.rate.num * SPA_NSEC_PER_SEC);
}
filled = pw->time.delay + snd_pcm_ioplug_hw_avail(io, pw->hw_ptr, io->appl_ptr);
if (io->stream == SND_PCM_STREAM_PLAYBACK)
*delayp = filled - SPA_MIN(elapsed, filled);
else
*delayp = filled + elapsed;
return 0;
}
static int
snd_pcm_pipewire_process(snd_pcm_pipewire_t *pw, struct pw_buffer *b, snd_pcm_uframes_t *hw_avail)
{
@ -257,7 +280,7 @@ snd_pcm_pipewire_process(snd_pcm_pipewire_t *pw, struct pw_buffer *b, snd_pcm_uf
}
/* check if requested frames were copied */
if (xfer < nframes) {
/* always fill the not yet written JACK buffer with silence */
/* always fill the not yet written PipeWire buffer with silence */
if (io->stream == SND_PCM_STREAM_PLAYBACK) {
const snd_pcm_uframes_t frames = nframes - xfer;
@ -270,7 +293,6 @@ snd_pcm_pipewire_process(snd_pcm_pipewire_t *pw, struct pw_buffer *b, snd_pcm_uf
pw->xrun_detected = true;
}
}
return 0;
}
@ -325,6 +347,8 @@ static void on_stream_process(void *data)
struct pw_buffer *b;
snd_pcm_uframes_t hw_avail;
pw_stream_get_time(pw->stream, &pw->time);
hw_avail = snd_pcm_ioplug_hw_avail(io, pw->hw_ptr, io->appl_ptr);
if (pw->drained) {
@ -762,6 +786,7 @@ static snd_pcm_ioplug_callback_t pipewire_pcm_callback = {
.stop = snd_pcm_pipewire_stop,
.pause = snd_pcm_pipewire_pause,
.pointer = snd_pcm_pipewire_pointer,
.delay = snd_pcm_pipewire_delay,
.drain = snd_pcm_pipewire_drain,
.prepare = snd_pcm_pipewire_prepare,
.poll_revents = snd_pcm_pipewire_poll_revents,