static av_cold int png_dec_end(AVCodecContext *avctx) { PNGDecContext *s = avctx->priv_data; ff_thread_release_buffer(avctx, &s->previous_picture); av_frame_free(&s->previous_picture.f); ff_thread_release_buffer(avctx, &s->last_picture); av_frame_free(&s->last_picture.f); ff_thread_release_buffer(avctx, &s->picture); av_frame_free(&s->picture.f); av_freep(&s->buffer); s->buffer_size = 0; av_freep(&s->last_row); s->last_row_size = 0; av_freep(&s->tmp_row); s->tmp_row_size = 0; av_freep(&s->extra_data); s->extra_data_size = 0; return 0; }