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alsa: pause/resume when entering/exiting freewheel

Browse source 
When we start freewheeling, pause the device and resume when we
finish freewheel.
In freewheel mode, just discard samples in the sink and produce
silence in the source.
This commit is contained in:
Wim Taymans 2021-05-07 11:51:22 +02:00
parent a80ec36ad5
commit 02decd9fba
4 changed files with 62 additions and 16 deletions
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51
spa/plugins/alsa/alsa-pcm.c
View file

@ -1158,7 +1158,7 @@ push_frames(struct state *state,
}
int spa_alsa_read(struct state *state, snd_pcm_uframes_t silence)
int spa_alsa_read(struct state *state)
{
snd_pcm_t *hndl = state->hndl;
snd_pcm_uframes_t total_read = 0, to_read;
@ -1260,6 +1260,40 @@ int spa_alsa_read(struct state *state, snd_pcm_uframes_t silence)
return 0;
}
int spa_alsa_skip(struct state *state)
{
struct buffer *b;
struct spa_data *d;
uint32_t i, avail, total_frames, n_bytes, frames;
if (spa_list_is_empty(&state->free)) {
spa_log_warn(state->log, NAME" %s: no more buffers", state->props.device);
return -EPIPE;
}
frames = state->read_size;
b = spa_list_first(&state->free, struct buffer, link);
spa_list_remove(&b->link);
d = b->buf->datas;
avail = d[0].maxsize / state->frame_size;
total_frames = SPA_MIN(avail, frames);
n_bytes = total_frames * state->frame_size;
for (i = 0; i < b->buf->n_datas; i++) {
memset(d[i].data, 0, n_bytes);
d[i].chunk->offset = 0;
d[i].chunk->size = n_bytes;
d[i].chunk->stride = state->frame_size;
}
spa_list_append(&state->ready, &b->link);
return 0;
}
static int handle_play(struct state *state, uint64_t nsec,
snd_pcm_uframes_t delay, snd_pcm_uframes_t target)
{
@ -1305,7 +1339,7 @@ static int handle_capture(struct state *state, uint64_t nsec,
if (SPA_UNLIKELY(res = update_time(state, nsec, delay, target, false)) < 0)
return res;
if ((res = spa_alsa_read(state, target)) < 0)
if ((res = spa_alsa_read(state)) < 0)
return res;
if (spa_list_is_empty(&state->ready))
@ -1508,7 +1542,7 @@ static int do_reassign_follower(struct spa_loop *loop,
int spa_alsa_reassign_follower(struct state *state)
{
bool following;
bool following, freewheel;
if (!state->started)
return 0;
@ -1520,6 +1554,17 @@ int spa_alsa_reassign_follower(struct state *state)
spa_loop_invoke(state->data_loop, do_reassign_follower, 0, NULL, 0, true, state);
}
setup_matching(state);
freewheel = state->position &&
SPA_FLAG_IS_SET(state->position->clock.flags, SPA_IO_CLOCK_FLAG_FREEWHEEL);
if (state->freewheel != freewheel) {
state->freewheel = freewheel;
if (freewheel)
snd_pcm_pause(state->hndl, 1);
else
snd_pcm_pause(state->hndl, 0);
}
return 0;
}