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audio: pipewire: Block while waiting on stream state info 

Initializing streams, particularly capture streams, can take many milliseconds, which is a bit much for a busy wait.  Use a blocking wait instead.
This commit is contained in:
Frank Praznik 2021-03-28 17:45:41 -04:00 committed by Sam Lantinga
parent 8deb406300
commit 5f9effaa7e
2 changed files with 31 additions and 12 deletions
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38
src/audio/pipewire/SDL_pipewire.c
View File

@ -983,8 +983,23 @@ input_callback(void *data)
PIPEWIRE_pw_stream_queue_buffer(stream, pw_buf);
}
static const struct pw_stream_events stream_output_events = { PW_VERSION_STREAM_EVENTS, .process = output_callback };
static const struct pw_stream_events stream_input_events = { PW_VERSION_STREAM_EVENTS, .process = input_callback };
static void
stream_state_changed_callback(void *data, enum pw_stream_state old, enum pw_stream_state state, const char *error)
{
_THIS = data;
if (state == PW_STREAM_STATE_STREAMING || state == PW_STREAM_STATE_ERROR) {
SDL_AtomicSet(&this->hidden->stream_initialized, 1);
PIPEWIRE_pw_thread_loop_signal(this->hidden->loop, false);
}
}
static const struct pw_stream_events stream_output_events = { PW_VERSION_STREAM_EVENTS,
.state_changed = stream_state_changed_callback,
.process = output_callback };
static const struct pw_stream_events stream_input_events = { PW_VERSION_STREAM_EVENTS,
.state_changed = stream_state_changed_callback,
.process = input_callback };
static int
PIPEWIRE_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
@ -1005,7 +1020,7 @@ PIPEWIRE_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
const struct spa_pod * params = NULL;
struct SDL_PrivateAudioData *priv;
struct pw_properties * props;
const char * app_name, *stream_name, *stream_role;
const char * app_name, *stream_name, *stream_role, *error;
const Uint32 node_id = this->handle == NULL ? PW_ID_ANY : PW_HANDLE_TO_ID(this->handle);
enum pw_stream_state state;
int res;
@ -1120,14 +1135,17 @@ PIPEWIRE_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
}
/* Wait until the stream is either running or failed */
do {
const char *error;
state = PIPEWIRE_pw_stream_get_state(priv->stream, &error);
PIPEWIRE_pw_thread_loop_lock(priv->loop);
if (!SDL_AtomicGet(&priv->stream_initialized)) {
PIPEWIRE_pw_thread_loop_wait(priv->loop);
}
PIPEWIRE_pw_thread_loop_unlock(priv->loop);
if (state == PW_STREAM_STATE_ERROR) {
return SDL_SetError("Pipewire: Stream error: %s", error);
}
} while (state != PW_STREAM_STATE_STREAMING);
state = PIPEWIRE_pw_stream_get_state(priv->stream, &error);
if (state == PW_STREAM_STATE_ERROR) {
return SDL_SetError("Pipewire: Stream error: %s", error);
}
return 0;
}

5
src/audio/pipewire/SDL_pipewire.h
View File

@ -37,8 +37,9 @@ struct SDL_PrivateAudioData
struct pw_context *context;
struct SDL_DataQueue *buffer;
size_t buffer_period_size;
Sint32 stride; /* Bytes-per-frame */
size_t buffer_period_size;
Sint32 stride; /* Bytes-per-frame */
SDL_atomic_t stream_initialized;
};
#endif /* SDL_pipewire_h_ */