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alsa: rework source a little in the case of slave

Browse source 
When we are slaved, read as much data as we have available and return
this from process.
This commit is contained in:
Wim Taymans 2019-04-11 16:44:07 +02:00
parent 8b1e5fedc9
commit 715594c6ef
4 changed files with 124 additions and 100 deletions
Download patch file Download diff file Expand all files Collapse all files

2
spa/plugins/alsa/alsa-sink.c
View file

@ -638,7 +638,7 @@ static int impl_node_process(struct spa_node *node)
SPA_FLAG_UNSET(b->flags, BUFFER_FLAG_OUT);
input->buffer_id = SPA_ID_INVALID;
spa_alsa_write(this, 0, true);
spa_alsa_write(this, 0);
input->status = SPA_STATUS_OK;
}

3
spa/plugins/alsa/alsa-source.c
View file

@ -647,6 +647,9 @@ static int impl_node_process(struct spa_node *node)
io->buffer_id = SPA_ID_INVALID;
}
if (spa_list_is_empty(&this->ready))
spa_alsa_read(this, 0);
if (spa_list_is_empty(&this->ready))
return SPA_STATUS_OK;

215
spa/plugins/alsa/alsa-utils.c
View file

@ -549,28 +549,28 @@ static int alsa_recover(struct state *state, int err)
state->alsa_started = true;
} else {
state->alsa_started = false;
spa_alsa_write(state, state->threshold * 2, true);
spa_alsa_write(state, state->threshold * 2);
}
return 0;
}
static int get_status(struct state *state, snd_pcm_sframes_t *delay)
{
snd_pcm_sframes_t av;
snd_pcm_sframes_t avail;
int res;
if ((av = snd_pcm_avail(state->hndl)) < 0) {
if ((res = alsa_recover(state, av)) < 0)
if ((avail = snd_pcm_avail(state->hndl)) < 0) {
if ((res = alsa_recover(state, avail)) < 0)
return res;
if ((av = snd_pcm_avail(state->hndl)) < 0)
return av;
if ((avail = snd_pcm_avail(state->hndl)) < 0)
return avail;
}
if (delay) {
if (state->stream == SND_PCM_STREAM_PLAYBACK)
*delay = state->buffer_frames - av;
*delay = state->buffer_frames - avail;
else
*delay = av;
*delay = avail;
}
return 0;
}
@ -643,7 +643,7 @@ static int update_time(struct state *state, uint64_t nsec, snd_pcm_sframes_t del
return 0;
}
int spa_alsa_write(struct state *state, snd_pcm_uframes_t silence, bool start)
int spa_alsa_write(struct state *state, snd_pcm_uframes_t silence)
{
snd_pcm_t *hndl = state->hndl;
const snd_pcm_channel_area_t *my_areas;
@ -670,6 +670,7 @@ int spa_alsa_write(struct state *state, snd_pcm_uframes_t silence, bool start)
state->dll.dt, nsec, delay, state->rate);
if (delay > state->threshold * 2) {
spa_log_warn(state->log, "slave: skip period");
snd_pcm_rewind(state->hndl, state->threshold);
delay -= state->threshold;
}
@ -759,7 +760,7 @@ again:
state->sample_count += total_written;
if (!state->alsa_started && written > 0 && start) {
if (!state->alsa_started && total_written > 0) {
spa_log_trace(state->log, "snd_pcm_start %lu", written);
if ((res = snd_pcm_start(hndl)) < 0) {
spa_log_error(state->log, "snd_pcm_start: %s", snd_strerror(res));
@ -787,7 +788,6 @@ push_frames(struct state *state,
struct buffer *b;
struct spa_data *d;
uint32_t index, offs, avail, l0, l1;
struct spa_io_buffers *io;
b = spa_list_first(&state->free, struct buffer, link);
spa_list_remove(&b->link);
@ -820,47 +820,87 @@ push_frames(struct state *state,
d[0].chunk->stride = state->frame_size;
SPA_FLAG_SET(b->flags, BUFFER_FLAG_OUT);
io = state->io;
if (io != NULL && io->status != SPA_STATUS_HAVE_BUFFER) {
io->buffer_id = b->id;
io->status = SPA_STATUS_HAVE_BUFFER;
}
else {
spa_list_append(&state->ready, &b->link);
}
state->callbacks->ready(state->callbacks_data, SPA_STATUS_HAVE_BUFFER);
spa_list_append(&state->ready, &b->link);
}
return total_frames;
}
static int handle_play(struct state *state)
int spa_alsa_read(struct state *state, snd_pcm_uframes_t silence)
{
snd_pcm_t *hndl = state->hndl;
snd_pcm_uframes_t total_read = 0, to_read;
const snd_pcm_channel_area_t *my_areas;
snd_pcm_uframes_t read, frames, offset;
int res;
snd_pcm_sframes_t delay;
uint64_t nsec;
if (state->position && state->threshold != state->position->size)
state->threshold = state->position->size;
clock_gettime(CLOCK_MONOTONIC, &state->now);
if ((res = get_status(state, &delay)) < 0)
return 0;
if (state->slaved) {
uint64_t nsec, master;
snd_pcm_sframes_t delay;
nsec = SPA_TIMESPEC_TO_NSEC(&state->now);
spa_log_trace_fp(state->log, "timeout %ld %"PRIu64" %"PRIu64" %"PRIi64" %d %ld", delay,
nsec, state->next_time, nsec - state->next_time,
state->threshold, state->sample_count);
master = state->position->clock.position + state->position->clock.delay;
nsec = master * SPA_NSEC_PER_SEC / state->rate;
if ((res = get_status(state, &delay)) < 0)
return res;
if ((res = update_time(state, nsec, delay, true)) < 0)
return res;
spa_log_trace_fp(state->log, "slave %f %"PRIi64" %"PRIu64" %d",
state->dll.dt, nsec, delay, state->rate);
if (delay > state->threshold * 2) {
spa_log_trace_fp(state->log, "slave: skip period");
snd_pcm_forward(state->hndl, state->threshold);
delay -= state->threshold;
}
}
again:
to_read = state->buffer_frames;
if ((res = snd_pcm_mmap_begin(hndl, &my_areas, &offset, &to_read)) < 0) {
spa_log_error(state->log, "snd_pcm_mmap_begin error: %s", snd_strerror(res));
return res;
}
frames = SPA_MIN(to_read, state->threshold);
spa_log_trace_fp(state->log, "begin %ld %ld %d", offset, frames, state->threshold);
read = push_frames(state, my_areas, offset, frames);
spa_log_trace_fp(state->log, "commit %ld %ld %"PRIi64, offset, read, state->sample_count);
total_read += read;
if ((res = snd_pcm_mmap_commit(hndl, offset, read)) < 0) {
spa_log_error(state->log, "snd_pcm_mmap_commit error: %s", snd_strerror(res));
if (res != -EPIPE && res != -ESTRPIPE)
return res;
}
to_read -= read;
if (read > 0 && to_read >= state->threshold && !spa_list_is_empty(&state->free))
goto again;
state->sample_count += total_read;
return 0;
}
static int handle_play(struct state *state, uint64_t nsec, snd_pcm_sframes_t delay)
{
int res;
if (delay >= state->threshold * 2) {
spa_log_trace(state->log, "early wakeup %ld %d", delay, state->threshold);
state->next_time = nsec + (state->threshold / 2) * SPA_NSEC_PER_SEC / state->rate;
return 0;
return -EAGAIN;
}
if ((res = update_time(state, nsec, delay, false)) < 0)
return 0;
return res;
if (spa_list_is_empty(&state->ready)) {
struct spa_io_buffers *io = state->io;
@ -873,36 +913,52 @@ static int handle_play(struct state *state)
state->range->min_size = state->threshold * state->frame_size;
state->range->max_size = state->threshold * state->frame_size;
}
state->callbacks->ready(state->callbacks_data, SPA_STATUS_NEED_BUFFER);
res = state->callbacks->ready(state->callbacks_data, SPA_STATUS_NEED_BUFFER);
}
else {
spa_alsa_write(state, 0, true);
res = spa_alsa_write(state, 0);
}
return res;
}
static int handle_capture(struct state *state, uint64_t nsec, snd_pcm_sframes_t delay)
{
int res;
struct spa_io_buffers *io;
if (delay < state->threshold) {
spa_log_trace(state->log, "early wakeup %ld %d", delay, state->threshold);
state->next_time = nsec + (state->threshold - delay) * SPA_NSEC_PER_SEC / state->rate;
return 0;
}
if ((res = update_time(state, nsec, delay, false)) < 0)
return res;
if ((res = spa_alsa_read(state, 0)) < 0)
return res;
if (!spa_list_is_empty(&state->ready)) {
io = state->io;
if (io != NULL && io->status != SPA_STATUS_HAVE_BUFFER) {
struct buffer *b = spa_list_first(&state->ready, struct buffer, link);
spa_list_remove(&b->link);
io->buffer_id = b->id;
io->status = SPA_STATUS_HAVE_BUFFER;
}
state->callbacks->ready(state->callbacks_data, SPA_STATUS_HAVE_BUFFER);
}
return 0;
}
static void alsa_on_playback_timeout_event(struct spa_source *source)
static void alsa_on_timeout_event(struct spa_source *source)
{
struct state *state = source->data;
uint64_t expire;
if (state->started && read(state->timerfd, &expire, sizeof(uint64_t)) != sizeof(uint64_t))
spa_log_warn(state->log, "error reading timerfd: %s", strerror(errno));
handle_play(state);
set_timeout(state, state->next_time);
}
static void alsa_on_capture_timeout_event(struct spa_source *source)
{
uint64_t expire, nsec;
int res;
struct state *state = source->data;
snd_pcm_t *hndl = state->hndl;
snd_pcm_sframes_t delay;
snd_pcm_uframes_t total_read = 0, to_read;
const snd_pcm_channel_area_t *my_areas;
uint64_t nsec;
uint64_t expire;
int res;
if (state->started && read(state->timerfd, &expire, sizeof(uint64_t)) != sizeof(uint64_t))
spa_log_warn(state->log, "error reading timerfd: %s", strerror(errno));
@ -919,42 +975,11 @@ static void alsa_on_capture_timeout_event(struct spa_source *source)
nsec, state->next_time, nsec - state->next_time,
state->threshold, state->sample_count);
if (delay < state->threshold) {
spa_log_trace(state->log, "early wakeup %ld %d", delay, state->threshold);
state->next_time = nsec + (state->threshold - delay) * SPA_NSEC_PER_SEC / state->rate;
goto next;
}
if (state->stream == SND_PCM_STREAM_PLAYBACK)
handle_play(state, nsec, delay);
else
handle_capture(state, nsec, delay);
if ((res = update_time(state, nsec, delay, false)) < 0)
return;
to_read = SPA_MIN(delay, state->threshold);
while (total_read < to_read) {
snd_pcm_uframes_t read, frames, offset;
frames = to_read - total_read;
spa_log_trace_fp(state->log, "begin %ld %ld %ld %ld", offset, frames, to_read, total_read);
if ((res = snd_pcm_mmap_begin(hndl, &my_areas, &offset, &frames)) < 0) {
spa_log_error(state->log, "snd_pcm_mmap_begin error: %s", snd_strerror(res));
return;
}
read = push_frames(state, my_areas, offset, frames);
if (read < frames)
to_read = 0;
spa_log_trace_fp(state->log, "commit %ld %ld", offset, read);
if ((res = snd_pcm_mmap_commit(hndl, offset, read)) < 0) {
spa_log_error(state->log, "snd_pcm_mmap_commit error: %s", snd_strerror(res));
if (res != -EPIPE && res != -ESTRPIPE)
return;
}
total_read += read;
}
state->sample_count += total_read;
next:
set_timeout(state, state->next_time);
}
@ -999,7 +1024,7 @@ int spa_alsa_start(struct state *state)
state->old_dt = 1.0;
state->safety = 0.0;
spa_log_debug(state->log, "alsa %p: start %d %d", state, state->threshold, state->slaved);
spa_log_debug(state->log, "alsa %p: start %d slave:%d", state, state->threshold, state->slaved);
CHECK(set_swparams(state), "swparams");
snd_pcm_dump(state->hndl, state->output);
@ -1010,11 +1035,7 @@ int spa_alsa_start(struct state *state)
}
if (!state->slaved) {
if (state->stream == SND_PCM_STREAM_PLAYBACK) {
state->source.func = alsa_on_playback_timeout_event;
} else {
state->source.func = alsa_on_capture_timeout_event;
}
state->source.func = alsa_on_timeout_event;
state->source.data = state;
state->source.fd = state->timerfd;
state->source.mask = SPA_IO_IN;
@ -1026,7 +1047,7 @@ int spa_alsa_start(struct state *state)
if (state->stream == SND_PCM_STREAM_PLAYBACK) {
state->alsa_started = false;
spa_alsa_write(state, state->threshold * 2, true);
spa_alsa_write(state, state->threshold * 2);
} else {
if ((err = snd_pcm_start(state->hndl)) < 0) {
spa_log_error(state->log, "snd_pcm_start: %s", snd_strerror(err));

4
spa/plugins/alsa/alsa-utils.h
View file

@ -157,8 +157,8 @@ int spa_alsa_start(struct state *state);
int spa_alsa_pause(struct state *state);
int spa_alsa_close(struct state *state);
int spa_alsa_write(struct state *state, snd_pcm_uframes_t silence, bool start);
int spa_alsa_write(struct state *state, snd_pcm_uframes_t silence);
int spa_alsa_read(struct state *state, snd_pcm_uframes_t silence);
static inline void dll_bandwidth(struct dll *dll, double bandwidth)
{