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examples: update some examples with RequestProcess

Browse source 
Let video-src unconditionally call _trigger_process() when it is
ready. This will either start the graph when it is the driver or emit
a RequestProcess event to the driver.

Let video-play-pull intercept the RequestProcess command and use it
to do a trigger_process(). Otherwise use a timer to pull in the next
frame.
This commit is contained in:
Wim Taymans 2021-10-19 16:15:07 +02:00
parent baca092ba5
commit a84e43e3ee
2 changed files with 42 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

54
src/examples/video-play-pull.c
View file

@ -74,6 +74,7 @@ struct data {
SDL_Rect rect;
SDL_Rect cursor_rect;
bool is_yuv;
bool have_request_process;
};
static void handle_events(struct data *data)
@ -244,6 +245,25 @@ on_process(void *_data)
pw_stream_queue_buffer(stream, b);
}
static void enable_timeouts(struct data *data, bool enabled)
{
struct timespec timeout, interval, *to, *iv;
if (!enabled || data->have_request_process) {
to = iv = NULL;
} else {
timeout.tv_sec = 0;
timeout.tv_nsec = 1;
interval.tv_sec = 0;
interval.tv_nsec = 80 * SPA_NSEC_PER_MSEC;
to = &timeout;
iv = &interval;
}
pw_loop_update_timer(pw_main_loop_get_loop(data->loop),
data->timer, to, iv, false);
}
static void on_stream_state_changed(void *_data, enum pw_stream_state old,
enum pw_stream_state state, const char *error)
{
@ -254,22 +274,11 @@ static void on_stream_state_changed(void *_data, enum pw_stream_state old,
pw_main_loop_quit(data->loop);
break;
case PW_STREAM_STATE_PAUSED:
pw_loop_update_timer(pw_main_loop_get_loop(data->loop),
data->timer, NULL, NULL, false);
enable_timeouts(data, false);
break;
case PW_STREAM_STATE_STREAMING:
{
struct timespec timeout, interval;
timeout.tv_sec = 0;
timeout.tv_nsec = 1;
interval.tv_sec = 0;
interval.tv_nsec = 80 * SPA_NSEC_PER_MSEC;
pw_loop_update_timer(pw_main_loop_get_loop(data->loop),
data->timer, &timeout, &interval, false);
enable_timeouts(data, true);
break;
}
default:
break;
}
@ -297,7 +306,23 @@ on_trigger_done(void *_data)
static void on_timeout(void *userdata, uint64_t expirations)
{
struct data *data = userdata;
pw_stream_trigger_process(data->stream);
if (!data->have_request_process)
pw_stream_trigger_process(data->stream);
}
static void
on_command(void *_data, const struct spa_command *command)
{
struct data *data = _data;
switch (SPA_NODE_COMMAND_ID(command)) {
case SPA_NODE_COMMAND_RequestProcess:
data->have_request_process = true;
enable_timeouts(data, false);
pw_stream_trigger_process(data->stream);
break;
default:
break;
}
}
/* Be notified when the stream param changes. We're only looking at the
@ -432,6 +457,7 @@ static const struct pw_stream_events stream_events = {
.param_changed = on_stream_param_changed,
.process = on_process,
.trigger_done = on_trigger_done,
.command = on_command,
};
static int build_format(struct data *data, struct spa_pod_builder *b, const struct spa_pod **params)

5
src/examples/video-src.c
View file

@ -214,9 +214,8 @@ static void on_stream_state_changed(void *_data, enum pw_stream_state old, enum
interval.tv_sec = 0;
interval.tv_nsec = 40 * SPA_NSEC_PER_MSEC;
if (pw_stream_is_driving(data->stream))
pw_loop_update_timer(pw_main_loop_get_loop(data->loop),
data->timer, &timeout, &interval, false);
pw_loop_update_timer(pw_main_loop_get_loop(data->loop),
data->timer, &timeout, &interval, false);
break;
}
default: