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alsa: increase precision of delay function

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pw->time.delay is delay in number of frames in pw->time.rate domain,
however snd_pcm_pipewire_delay function is suppose to return number of
frames in io->rate domain. Convert pw->time.delay to io->rate domain to
increase precision when the io->rate is not equal to the pw->time.rate

snd_pcm_pipewire_delay should return how many frames are queued in
pipewire, pw_stream_get_time returns numbers of the queued frames before
snd_pcm_pipewire_process is called, however this function inserts (or
removes) some frames from pipewire. Therefore newly inserted (removed)
frames should be added to pw->time.delay to increase precision.

Signed-off-by: Martin Geier <martin.geier@streamunlimited.com>
This commit is contained in:
Martin Geier 2021-11-02 13:56:29 +01:00 • committed by Wim Taymans
parent 925644fbcc
commit a7d238ed59
1 changed files with 16 additions and 4 deletions
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20
pipewire-alsa/alsa-plugins/pcm_pipewire.c
View file

@ -234,7 +234,7 @@ static int snd_pcm_pipewire_delay(snd_pcm_ioplug_t *io, snd_pcm_sframes_t *delay
return 0;
}
static int
static snd_pcm_uframes_t
snd_pcm_pipewire_process(snd_pcm_pipewire_t *pw, struct pw_buffer *b,
snd_pcm_uframes_t *hw_avail,snd_pcm_uframes_t want)
{
@ -319,6 +319,7 @@ snd_pcm_pipewire_process(snd_pcm_pipewire_t *pw, struct pw_buffer *b,
snd_pcm_areas_silence(pwareas, xfer, io->channels,
frames, io->format);
xfer += frames;
}
if (io->state == SND_PCM_STATE_RUNNING ||
io->state == SND_PCM_STATE_DRAINING) {
@ -326,7 +327,7 @@ snd_pcm_pipewire_process(snd_pcm_pipewire_t *pw, struct pw_buffer *b,
pw->xrun_detected = true;
}
}
return 0;
return xfer;
}
static void on_stream_param_changed(void *data, uint32_t id, const struct spa_pod *param)
@ -387,10 +388,16 @@ static void on_stream_process(void *data)
snd_pcm_pipewire_t *pw = data;
snd_pcm_ioplug_t *io = &pw->io;
struct pw_buffer *b;
snd_pcm_uframes_t hw_avail, want;
snd_pcm_uframes_t hw_avail, want, xfer;
pw_stream_get_time(pw->stream, &pw->time);
if (pw->time.rate.num != 0) {
pw->time.delay = pw->time.delay * io->rate * pw->time.rate.num / pw->time.rate.denom;
pw->time.rate.denom = io->rate;
pw->time.rate.num = 1;
}
hw_avail = snd_pcm_ioplug_hw_avail(io, pw->hw_ptr, io->appl_ptr);
if (pw->drained) {
@ -405,7 +412,12 @@ static void on_stream_process(void *data)
want = pw->rate_match ? pw->rate_match->size : hw_avail;
pw_log_trace("%p: avail:%lu want:%lu", pw, hw_avail, want);
snd_pcm_pipewire_process(pw, b, &hw_avail, want);
xfer = snd_pcm_pipewire_process(pw, b, &hw_avail, want);
if (io->stream == SND_PCM_STREAM_PLAYBACK)
pw->time.delay += xfer;
else
pw->time.delay -= SPA_MIN(pw->time.delay, xfer);
pw_stream_queue_buffer(pw->stream, b);