decode: flush the internal bsfs instead of constantly reinitalizing them

Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/decode.c

@@ -156,7 +156,7 @@ static int unrefcount_frame(AVCodecInternal *avci, AVFrame *frame)
     return 0;
 }
 
-static int bsfs_init(AVCodecContext *avctx)
+int ff_decode_bsfs_init(AVCodecContext *avctx)
 {
     AVCodecInternal *avci = avctx->internal;
     DecodeFilterContext *s = &avci->filter;
@@ -449,10 +449,6 @@ int attribute_align_arg avcodec_send_packet(AVCodecContext *avctx, const AVPacke
     if (avctx->internal->draining)
         return AVERROR_EOF;
 
-    ret = bsfs_init(avctx);
-    if (ret < 0)
-        return ret;
-
     av_packet_unref(avci->buffer_pkt);
     if (avpkt && (avpkt->data || avpkt->side_data_elems)) {
         ret = av_packet_ref(avci->buffer_pkt, avpkt);
@@ -511,10 +507,6 @@ int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *fr
     if (!avcodec_is_open(avctx) || !av_codec_is_decoder(avctx->codec))
         return AVERROR(EINVAL);
 
-    ret = bsfs_init(avctx);
-    if (ret < 0)
-        return ret;
-
     if (avci->buffer_frame->buf[0]) {
         av_frame_move_ref(frame, avci->buffer_frame);
     } else {
@@ -1394,6 +1386,14 @@ int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
     return 0;
 }
 
+static void bsfs_flush(AVCodecContext *avctx)
+{
+    DecodeFilterContext *s = &avctx->internal->filter;
+
+    for (int i = 0; i < s->nb_bsfs; i++)
+        av_bsf_flush(s->bsfs[i]);
+}
+
 void avcodec_flush_buffers(AVCodecContext *avctx)
 {
     avctx->internal->draining      = 0;
@@ -1410,7 +1410,7 @@ void avcodec_flush_buffers(AVCodecContext *avctx)
     else if (avctx->codec->flush)
         avctx->codec->flush(avctx);
 
-    ff_decode_bsfs_uninit(avctx);
+    bsfs_flush(avctx);
 
     if (!avctx->refcounted_frames)
         av_frame_unref(avctx->internal->to_free);

libavcodec/decode.h

@@ -69,6 +69,8 @@ typedef struct FrameDecodeData {
  */
 int ff_decode_get_packet(AVCodecContext *avctx, AVPacket *pkt);
 
+int ff_decode_bsfs_init(AVCodecContext *avctx);
+
 void ff_decode_bsfs_uninit(AVCodecContext *avctx);
 
 /**

libavcodec/utils.c

@@ -512,6 +512,12 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *code
         avctx->time_base.den = avctx->sample_rate;
     }
 
+    if (av_codec_is_decoder(avctx->codec)) {
+        ret = ff_decode_bsfs_init(avctx);
+        if (ret < 0)
+            goto free_and_end;
+    }
+
     if (HAVE_THREADS) {
         ret = ff_thread_init(avctx);
         if (ret < 0) {
@@ -706,6 +712,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
         av_packet_free(&avctx->internal->last_pkt_props);
 
         av_packet_free(&avctx->internal->ds.in_pkt);
+        ff_decode_bsfs_uninit(avctx);
 
         av_freep(&avctx->internal->pool);
     }