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Slightly reduce lock usage 

Locking the frame_buffer mutex to reference the input frame into the
tmp_frame is unnecessary.

This also fixes the missing unlock on error.
This commit is contained in:
Romain Vimont 2022-01-27 15:30:09 +01:00
parent 8e4d3beb01
commit 02b5e87802
1 changed files with 2 additions and 2 deletions
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4
app/src/frame_buffer.c
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@ -51,8 +51,6 @@ swap_frames(AVFrame **lhs, AVFrame **rhs) {
bool
sc_frame_buffer_push(struct sc_frame_buffer *fb, const AVFrame *frame,
bool *previous_frame_skipped) {
sc_mutex_lock(&fb->mutex);
// Use a temporary frame to preserve pending_frame in case of error.
// tmp_frame is an empty frame, no need to call av_frame_unref() beforehand.
int r = av_frame_ref(fb->tmp_frame, frame);
@ -61,6 +59,8 @@ sc_frame_buffer_push(struct sc_frame_buffer *fb, const AVFrame *frame,
return false;
}
sc_mutex_lock(&fb->mutex);
// Now that av_frame_ref() succeeded, we can replace the previous
// pending_frame
swap_frames(&fb->pending_frame, &fb->tmp_frame);