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Use a callback to notify a new frame

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Make the decoder independant of the SDL even mechanism, by making the
consumer register a callback on the video_buffer.
This commit is contained in:
Romain Vimont
2021-02-19 22:02:36 +01:00
parent c50b958ee4
commit fb9f9848bd
4 changed files with 59 additions and 7 deletions
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26
app/src/video_buffer.c
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@@ -43,6 +43,10 @@ video_buffer_init(struct video_buffer *vb, bool wait_consumer) {
// there is initially no frame, so consider it has already been consumed
vb->pending_frame_consumed = true;
// The callbacks must be set by the consumer via
// video_buffer_set_consumer_callbacks()
vb->cbs = NULL;
return true;
error_3:
@@ -82,9 +86,22 @@ video_buffer_swap_consumer_frame(struct video_buffer *vb) {
vb->pending_frame = tmp;
}
void
video_buffer_set_consumer_callbacks(struct video_buffer *vb,
const struct video_buffer_callbacks *cbs,
void *cbs_userdata) {
assert(!vb->cbs); // must be set only once
assert(cbs);
assert(cbs->on_frame_available);
vb->cbs = cbs;
vb->cbs_userdata = cbs_userdata;
}
void
video_buffer_producer_offer_frame(struct video_buffer *vb,
bool *previous_frame_skipped) {
assert(vb->cbs);
sc_mutex_lock(&vb->mutex);
if (vb->wait_consumer) {
// wait for the current (expired) frame to be consumed
@@ -95,10 +112,17 @@ video_buffer_producer_offer_frame(struct video_buffer *vb,
video_buffer_swap_producer_frame(vb);
*previous_frame_skipped = !vb->pending_frame_consumed;
bool skipped = !vb->pending_frame_consumed;
*previous_frame_skipped = skipped;
vb->pending_frame_consumed = false;
sc_mutex_unlock(&vb->mutex);
if (!skipped) {
// If skipped, then the previous call will consume this frame, the
// callback must not be called
vb->cbs->on_frame_available(vb, vb->cbs_userdata);
}
}
const AVFrame *