Avframe Memory Management API

int av_frame_ref(AVFrame *dst, const AVFrame *src)

It's like copying ,src Copied to the dst, But it's just that src The reference of the data inside is added 1, Then add the reference to dst in

AVFrame *av_frame_clone(const AVFrame *src);
Work with av_frame_ref similar , increase src Reference count of , But it will also initialize av_frame_clone object

void av_frame_unref(AVFrame* frame)
take frame The reference count is subtracted by one .

av_frame_free(): Release AVFrame Structure space of . This function is interesting . Because it not only frees up the space of the structure , Also involves AVFrame Medium uint8_t *data[AV_NUM_DATA_POINTERS]; Field release problem ., If AVFrame Medium uint8_t *data[AV_NUM_DATA_POINTERS] Citation in ==1, Then release data Space .

av_frame_unref（） Function is for frame Of buf Array One by one call av_buffer_unref（）.av_buffer_unref I told you before . Is that the reference count becomes 0, Let go data, Otherwise, only the memory of the structure itself will be released . Be careful , Premise is buf[i] It can't be null.

void av_frame_unref(AVFrame *frame)
{
int i;

if (!frame)
    return;

wipe_side_data(frame);

for (i = 0; i < FF_ARRAY_ELEMS(frame->buf); i++)
    av_buffer_unref(&frame->buf[i]);
for (i = 0; i < frame->nb_extended_buf; i++)
    av_buffer_unref(&frame->extended_buf[i]);
av_freep(&frame->extended_buf);
av_dict_free(&frame->metadata);

#if FF_API_FRAME_QP
FF_DISABLE_DEPRECATION_WARNINGS
av_buffer_unref(&frame->qp_table_buf);
FF_ENABLE_DEPRECATION_WARNINGS
#endif

av_buffer_unref(&frame->hw_frames_ctx);

av_buffer_unref(&frame->opaque_ref);
av_buffer_unref(&frame->private_ref);

get_frame_defaults(frame);

}
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