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alsa: rework the state sync code

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Make one function to sync the state with the realtime thread.
This commit is contained in:
Wim Taymans 2023-09-18 14:46:56 +02:00
parent 86f1d14b72
commit c51f6ccbd7
2 changed files with 40 additions and 64 deletions
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103
spa/plugins/alsa/alsa-pcm.c
View file

@ -2823,71 +2823,46 @@ static void reset_buffers(struct state *this)
}
}
static void clear_period_sources(struct state *state) {
/* This check is to make sure we've actually added the sources
* previously */
if (state->source[0].data) {
for (int i = 0; i < state->n_fds; i++) {
static void remove_sources(struct state *state)
{
int i;
if (state->sources_added) {
for (i = 0; i < state->n_fds; i++)
spa_loop_remove_source(state->data_loop, &state->source[i]);
state->source[i].func = NULL;
state->source[i].data = NULL;
state->source[i].fd = -1;
state->source[i].mask = 0;
state->source[i].rmask = 0;
}
state->sources_added = false;
}
}
static int do_setup_sources(struct spa_loop *loop,
bool async,
uint32_t seq,
const void *data,
size_t size,
void *user_data)
static void add_sources(struct state *state)
{
int i;
if (!state->sources_added) {
for (i = 0; i < state->n_fds; i++)
spa_loop_add_source(state->data_loop, &state->source[i]);
state->sources_added = true;
}
}
static int do_state_sync(struct spa_loop *loop, bool async, uint32_t seq,
const void *data, size_t size, void *user_data)
{
struct state *state = user_data;
spa_dll_init(&state->dll);
state->next_time = get_time_ns(state);
if (state->started) {
state->next_time = get_time_ns(state);
if (!state->disable_tsched) {
/* timers */
spa_loop_add_source(state->data_loop, &state->source[0]);
if (state->following)
set_timeout(state, 0);
else
set_timeout(state, state->next_time);
} else {
if (state->following) {
clear_period_sources(state);
remove_sources(state);
set_timeout(state, 0);
} else {
for (int i = 0; i < state->n_fds; i++) {
state->source[i].func = alsa_wakeup_event;
state->source[i].data = state;
state->source[i].fd = state->pfds[i].fd;
state->source[i].mask = state->pfds[i].events;
state->source[i].rmask = 0;
spa_loop_add_source(state->data_loop, &state->source[i]);
}
add_sources(state);
if (!state->disable_tsched)
set_timeout(state, state->next_time);
}
}
return 0;
}
static int do_remove_source(struct spa_loop *loop,
bool async,
uint32_t seq,
const void *data,
size_t size,
void *user_data)
{
struct state *state = user_data;
if (!state->disable_tsched) {
spa_loop_remove_source(state->data_loop, &state->source[0]);
set_timeout(state, 0);
} else {
clear_period_sources(state);
if (!state->disable_tsched)
set_timeout(state, 0);
remove_sources(state);
}
return 0;
}
@ -2953,6 +2928,7 @@ int spa_alsa_start(struct state *state)
state->source[0].fd = state->timerfd;
state->source[0].mask = SPA_IO_IN;
state->source[0].rmask = 0;
state->n_fds = 1;
} else {
/* ALSA period-based scheduling */
err = snd_pcm_poll_descriptors_count(state->hndl);
@ -2976,10 +2952,10 @@ int spa_alsa_start(struct state *state)
/* We only add the source to the data loop if we're driving.
* This is done in setup_sources() */
for (int i = 0; i < state->n_fds; i++) {
state->source[i].func = NULL;
state->source[i].data = NULL;
state->source[i].fd = -1;
state->source[i].mask = 0;
state->source[i].func = alsa_wakeup_event;
state->source[i].data = state;
state->source[i].fd = state->pfds[i].fd;
state->source[i].mask = state->pfds[i].events;
state->source[i].rmask = 0;
}
}
@ -2991,7 +2967,8 @@ int spa_alsa_start(struct state *state)
return err;
}
spa_loop_invoke(state->data_loop, do_setup_sources, 0, NULL, 0, true, state);
state->started = true;
spa_loop_invoke(state->data_loop, do_state_sync, 0, NULL, 0, true, state);
/* playback will start after first write. Without tsched, we start
* right away so that the fds become active in poll right away. */
@ -3000,8 +2977,6 @@ int spa_alsa_start(struct state *state)
if ((err = do_start(state)) < 0)
return err;
}
state->started = true;
return 0;
}
@ -3019,9 +2994,9 @@ int spa_alsa_reassign_follower(struct state *state)
spa_log_debug(state->log, "%p: reassign follower %d->%d", state, state->following, following);
state->following = following;
setup_matching(state);
if (state->started)
spa_loop_invoke(state->data_loop, do_setup_sources, 0, NULL, 0, true, state);
}
if (state->started)
spa_loop_invoke(state->data_loop, do_state_sync, 0, NULL, 0, true, state);
freewheel = pos != NULL && SPA_FLAG_IS_SET(pos->clock.flags, SPA_IO_CLOCK_FLAG_FREEWHEEL);
@ -3048,13 +3023,13 @@ int spa_alsa_pause(struct state *state)
spa_log_debug(state->log, "%p: pause", state);
spa_loop_invoke(state->data_loop, do_remove_source, 0, NULL, 0, true, state);
state->started = false;
spa_loop_invoke(state->data_loop, do_state_sync, 0, NULL, 0, true, state);
if ((err = snd_pcm_drop(state->hndl)) < 0)
spa_log_error(state->log, "%s: snd_pcm_drop %s", state->name,
snd_strerror(err));
state->started = false;
state->prepared = false;
return 0;

1
spa/plugins/alsa/alsa-pcm.h
View file

@ -203,6 +203,7 @@ struct state {
unsigned int multi_rate:1;
unsigned int htimestamp:1;
unsigned int is_pro:1;
unsigned int sources_added:1;
uint64_t iec958_codecs;