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Notify new frames via callbacks

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Currently, a frame is available to the consumer as soon as it is pushed
by the producer (which can detect if the previous frame is skipped).

Notify the new frames (and frame skipped) via callbacks instead.

This paves the way to add (optional) buffering, which will introduce a
delay between the time when the frame is produced and the time it is
available to be consumed.
This commit is contained in:
Romain Vimont
2021-07-04 12:42:22 +02:00
parent 4d8bcfc68a
commit 408a301201
4 changed files with 68 additions and 32 deletions
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22
app/src/screen.c
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@@ -274,14 +274,16 @@ screen_frame_sink_close(struct sc_frame_sink *sink) {
static bool
screen_frame_sink_push(struct sc_frame_sink *sink, const AVFrame *frame) {
struct screen *screen = DOWNCAST(sink);
return sc_video_buffer_push(&screen->vb, frame);
}
bool previous_frame_skipped;
bool ok = sc_video_buffer_push(&screen->vb, frame, &previous_frame_skipped);
if (!ok) {
return false;
}
static void
sc_video_buffer_on_new_frame(struct sc_video_buffer *vb, bool previous_skipped,
void *userdata) {
(void) vb;
struct screen *screen = userdata;
if (previous_frame_skipped) {
if (previous_skipped) {
fps_counter_add_skipped_frame(&screen->fps_counter);
// The EVENT_NEW_FRAME triggered for the previous frame will consume
// this new frame instead
@@ -293,8 +295,6 @@ screen_frame_sink_push(struct sc_frame_sink *sink, const AVFrame *frame) {
// Post the event on the UI thread
SDL_PushEvent(&new_frame_event);
}
return true;
}
bool
@@ -304,7 +304,11 @@ screen_init(struct screen *screen, const struct screen_params *params) {
screen->fullscreen = false;
screen->maximized = false;
bool ok = sc_video_buffer_init(&screen->vb);
static const struct sc_video_buffer_callbacks cbs = {
.on_new_frame = sc_video_buffer_on_new_frame,
};
bool ok = sc_video_buffer_init(&screen->vb, &cbs, screen);
if (!ok) {
LOGE("Could not initialize video buffer");
return false;