avformat/avienc: factor write_odml_master() out

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

libavformat/avienc.c

@@ -156,6 +156,34 @@ static int avi_write_counters(AVFormatContext *s, int riff_id)
     return 0;
 }
 
+static void write_odml_master(AVFormatContext *s, int stream_index)
+{
+    AVIOContext *pb = s->pb;
+    AVStream *st = s->streams[stream_index];
+    AVCodecContext *enc = st->codec;
+    AVIStream *avist = st->priv_data;
+    unsigned char tag[5];
+    int j;
+
+    /* Starting to lay out AVI OpenDML master index.
+        * We want to make it JUNK entry for now, since we'd
+        * like to get away without making AVI an OpenDML one
+        * for compatibility reasons. */
+    avist->indexes.entry      = avist->indexes.ents_allocated = 0;
+    avist->indexes.indx_start = ff_start_tag(pb, "JUNK");
+    avio_wl16(pb, 4);   /* wLongsPerEntry */
+    avio_w8(pb, 0);     /* bIndexSubType (0 == frame index) */
+    avio_w8(pb, 0);     /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
+    avio_wl32(pb, 0);   /* nEntriesInUse (will fill out later on) */
+    ffio_wfourcc(pb, avi_stream2fourcc(tag, stream_index, enc->codec_type));
+                        /* dwChunkId */
+    avio_wl64(pb, 0);   /* dwReserved[3] */
+    // avio_wl32(pb, 0);   /* Must be 0.    */
+    for (j = 0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
+        avio_wl64(pb, 0);
+    ff_end_tag(pb, avist->indexes.indx_start);
+}
+
 static int avi_write_header(AVFormatContext *s)
 {
     AVIContext *avi = s->priv_data;
@@ -365,26 +393,7 @@ static int avi_write_header(AVFormatContext *s)
         }
 
         if (pb->seekable) {
-            unsigned char tag[5];
-            int j;
-
-            /* Starting to lay out AVI OpenDML master index.
-             * We want to make it JUNK entry for now, since we'd
-             * like to get away without making AVI an OpenDML one
-             * for compatibility reasons. */
-            avist->indexes.entry      = avist->indexes.ents_allocated = 0;
-            avist->indexes.indx_start = ff_start_tag(pb, "JUNK");
-            avio_wl16(pb, 4);   /* wLongsPerEntry */
-            avio_w8(pb, 0);     /* bIndexSubType (0 == frame index) */
-            avio_w8(pb, 0);     /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
-            avio_wl32(pb, 0);   /* nEntriesInUse (will fill out later on) */
-            ffio_wfourcc(pb, avi_stream2fourcc(tag, i, enc->codec_type));
-                                /* dwChunkId */
-            avio_wl64(pb, 0);   /* dwReserved[3] */
-            // avio_wl32(pb, 0);   /* Must be 0.    */
-            for (j = 0; j < AVI_MASTER_INDEX_SIZE * 2; j++)
-                avio_wl64(pb, 0);
-            ff_end_tag(pb, avist->indexes.indx_start);
+            write_odml_master(s, i);
         }
 
         if (enc->codec_type == AVMEDIA_TYPE_VIDEO   &&