lavf: flush the output AVIOContext in av_write_trailer().

This is consistent with stdio and is what we want to do in all cases.

Fixes a bug in the voc muxer which didn't flush in write_trailer()
previously. This is the cause of the change in the test results.

libavformat/asfenc.c

@@ -872,7 +872,6 @@ static int asf_write_trailer(AVFormatContext *s)
         asf_write_header1(s, file_size, data_size - asf->data_offset);
     }
 
-    avio_flush(s->pb);
     av_free(asf->index_ptr);
     return 0;
 }

libavformat/assenc.c

@@ -72,8 +72,6 @@ static int write_trailer(AVFormatContext *s)
     avio_write(s->pb, avctx->extradata      + ass->extra_index,
                       avctx->extradata_size - ass->extra_index);
 
-    avio_flush(s->pb);
-
     return 0;
 }
 

libavformat/avienc.c

@@ -626,7 +626,6 @@ static int avi_write_trailer(AVFormatContext *s)
             avi_write_counters(s, avi->riff_id);
         }
     }
-    avio_flush(pb);
 
     for (i=0; i<s->nb_streams; i++) {
          AVIStream *avist= s->streams[i]->priv_data;

libavformat/crcenc.c

@@ -50,7 +50,7 @@ static int crc_write_trailer(struct AVFormatContext *s)
 
     snprintf(buf, sizeof(buf), "CRC=0x%08x\n", crc->crcval);
     avio_write(s->pb, buf, strlen(buf));
-    avio_flush(s->pb);
+
     return 0;
 }
 

libavformat/ffmenc.c

@@ -226,15 +226,12 @@ static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
 
 static int ffm_write_trailer(AVFormatContext *s)
 {
-    AVIOContext *pb = s->pb;
     FFMContext *ffm = s->priv_data;
 
     /* flush packets */
     if (ffm->packet_ptr > ffm->packet)
         flush_packet(s);
 
-    avio_flush(pb);
-
     return 0;
 }
 

libavformat/ffmetaenc.c

@@ -80,8 +80,6 @@ static int write_trailer(AVFormatContext *s)
         write_tags(s->pb, ch->metadata);
     }
 
-    avio_flush(s->pb);
-
     return 0;
 }
 

libavformat/filmstripenc.c

@@ -67,7 +67,7 @@ static int write_trailer(AVFormatContext *s)
     avio_wb16(pb, 1/av_q2d(st->codec->time_base));
     for (i = 0; i < 16; i++)
         avio_w8(pb, 0x00);  // reserved
-    avio_flush(pb);
+
     return 0;
 }
 

libavformat/gif.c

@@ -347,7 +347,7 @@ static int gif_write_trailer(AVFormatContext *s)
     AVIOContext *pb = s->pb;
 
     avio_w8(pb, 0x3b);
-    avio_flush(s->pb);
+
     return 0;
 }
 

libavformat/matroskaenc.c

@@ -1265,7 +1265,7 @@ static int mkv_write_trailer(AVFormatContext *s)
     av_freep(&mkv->cues->entries);
     av_freep(&mkv->cues);
     av_destruct_packet(&mkv->cur_audio_pkt);
-    avio_flush(pb);
+
     return 0;
 }
 

libavformat/movenc.c

@@ -3237,8 +3237,6 @@ static int mov_write_trailer(AVFormatContext *s)
 
     }
 
-    avio_flush(pb);
-
     av_freep(&mov->tracks);
 
     return res;

libavformat/mxfenc.c

@@ -1804,8 +1804,6 @@ static int mxf_write_footer(AVFormatContext *s)
         }
     }
 
-    avio_flush(pb);
-
     ff_audio_interleave_close(s);
 
     av_freep(&mxf->index_entries);

libavformat/nutenc.c

@@ -851,7 +851,7 @@ static int nut_write_trailer(AVFormatContext *s){
 
     while(nut->header_count<3)
         write_headers(s, bc);
-    avio_flush(bc);
+
     ff_nut_free_sp(nut);
     av_freep(&nut->stream);
     av_freep(&nut->chapter);

libavformat/rmenc.c

@@ -455,7 +455,7 @@ static int rm_write_trailer(AVFormatContext *s)
         avio_wb32(pb, 0);
         avio_wb32(pb, 0);
     }
-    avio_flush(pb);
+
     return 0;
 }
 

libavformat/rsoenc.c

@@ -95,8 +95,6 @@ static int rso_write_trailer(AVFormatContext *s)
     avio_wb16(pb, coded_file_size);
     avio_seek(pb, file_size, SEEK_SET);
 
-    avio_flush(pb);
-
     return 0;
 }
 

libavformat/smjpegenc.c

@@ -130,7 +130,6 @@ static int smjpeg_write_trailer(AVFormatContext *s)
     }
 
     avio_wl32(pb, SMJPEG_DONE);
-    avio_flush(pb);
 
     return 0;
 }

libavformat/swfenc.c

@@ -485,8 +485,6 @@ static int swf_write_trailer(AVFormatContext *s)
     put_swf_tag(s, TAG_END);
     put_swf_end_tag(s);
 
-    avio_flush(s->pb);
-
     /* patch file size and number of frames if not streamed */
     if (s->pb->seekable && video_enc) {
         file_size = avio_tell(pb);

libavformat/utils.c

@@ -3270,6 +3270,10 @@ int av_write_trailer(AVFormatContext *s)
 
     if (s->oformat->write_trailer)
         ret = s->oformat->write_trailer(s);
+
+    if (!(s->oformat->flags & AVFMT_NOFILE))
+        avio_flush(s->pb);
+
 fail:
     for (i = 0; i < s->nb_streams; i++) {
         av_freep(&s->streams[i]->priv_data);

tests/ref/lavf/voc

-b0bc287ce4e3eef7c1012610dd7ff6d0 *./tests/data/lavf/lavf.voc
-32768 ./tests/data/lavf/lavf.voc
-./tests/data/lavf/lavf.voc CRC=0xa2d77c12
+5c4ee01048e7a8a138a97e80cf7a1924 *./tests/data/lavf/lavf.voc
+45261 ./tests/data/lavf/lavf.voc
+./tests/data/lavf/lavf.voc CRC=0x74b2b546

tests/ref/lavf/voc_s16

-b20728bf036d2e23508869acbad4e576 *./tests/data/lavf/lavf.s16.voc
-163840 ./tests/data/lavf/lavf.s16.voc
-./tests/data/lavf/lavf.s16.voc CRC=0xfa9b6c39
+8ed10b311e49b4d4b18679b126492159 *./tests/data/lavf/lavf.s16.voc
+180437 ./tests/data/lavf/lavf.s16.voc
+./tests/data/lavf/lavf.s16.voc CRC=0x7bd585ff