avformat/avienc: factor frame skip code out

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/avienc.c

@@ -70,6 +70,8 @@ typedef struct  {
     AVIIndex indexes;
 } AVIStream;
 
+static int avi_write_packet(AVFormatContext *s, AVPacket *pkt);
+
 static inline AVIIentry *avi_get_ientry(const AVIIndex *idx, int ent_id)
 {
     int cl = ent_id / AVI_INDEX_CLUSTER_SIZE;
@@ -565,6 +567,32 @@ static int avi_write_idx1(AVFormatContext *s)
     return 0;
 }
 
+static int write_skip_frames(AVFormatContext *s, int stream_index, int64_t dts)
+{
+    AVIStream *avist    = s->streams[stream_index]->priv_data;
+    AVCodecContext *enc = s->streams[stream_index]->codec;
+
+    av_dlog(s, "dts:%s packet_count:%d stream_index:%d\n", av_ts2str(dts), avist->packet_count, stream_index);
+    while (enc->block_align == 0 && dts != AV_NOPTS_VALUE &&
+           dts > avist->packet_count && enc->codec_id != AV_CODEC_ID_XSUB && avist->packet_count) {
+        AVPacket empty_packet;
+
+        if (dts - avist->packet_count > 60000) {
+            av_log(s, AV_LOG_ERROR, "Too large number of skipped frames %"PRId64" > 60000\n", dts - avist->packet_count);
+            return AVERROR(EINVAL);
+        }
+
+        av_init_packet(&empty_packet);
+        empty_packet.size         = 0;
+        empty_packet.data         = NULL;
+        empty_packet.stream_index = stream_index;
+        avi_write_packet(s, &empty_packet);
+        av_dlog(s, "dup dts:%s packet_count:%d\n", av_ts2str(dts), avist->packet_count);
+    }
+
+    return 0;
+}
+
 static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
 {
     unsigned char tag[5];
@@ -575,29 +603,17 @@ static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
     AVIOContext *pb     = s->pb;
     AVIStream *avist    = s->streams[stream_index]->priv_data;
     AVCodecContext *enc = s->streams[stream_index]->codec;
+    int ret;
 
     if (enc->codec_id == AV_CODEC_ID_H264 && enc->codec_tag == MKTAG('H','2','6','4') && pkt->size) {
-        int ret = ff_check_h264_startcode(s, s->streams[stream_index], pkt);
+        ret = ff_check_h264_startcode(s, s->streams[stream_index], pkt);
         if (ret < 0)
             return ret;
     }
-    av_dlog(s, "dts:%s packet_count:%d stream_index:%d\n", av_ts2str(pkt->dts), avist->packet_count, stream_index);
-    while (enc->block_align == 0 && pkt->dts != AV_NOPTS_VALUE &&
-           pkt->dts > avist->packet_count && enc->codec_id != AV_CODEC_ID_XSUB && avist->packet_count) {
-        AVPacket empty_packet;
 
-        if (pkt->dts - avist->packet_count > 60000) {
-            av_log(s, AV_LOG_ERROR, "Too large number of skipped frames %"PRId64" > 60000\n", pkt->dts - avist->packet_count);
-            return AVERROR(EINVAL);
-        }
+    if ((ret = write_skip_frames(s, stream_index, pkt->dts)) < 0)
+        return ret;
 
-        av_init_packet(&empty_packet);
-        empty_packet.size         = 0;
-        empty_packet.data         = NULL;
-        empty_packet.stream_index = stream_index;
-        avi_write_packet(s, &empty_packet);
-        av_dlog(s, "dup dts:%s packet_count:%d\n", av_ts2str(pkt->dts), avist->packet_count);
-    }
     avist->packet_count++;
 
     // Make sure to put an OpenDML chunk when the file size exceeds the limits