Add support for ogg text subtitles.

Originally committed as revision 11698 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/oggdec.c

@@ -44,6 +44,7 @@ static ogg_codec_t *ogg_codecs[] = {
     &old_flac_codec,
     &ogm_video_codec,
     &ogm_audio_codec,
+    &ogm_text_codec,
     &ogm_old_codec,
     NULL
 };

libavformat/oggdec.h

@@ -81,6 +81,7 @@ extern ogg_codec_t flac_codec;
 extern ogg_codec_t old_flac_codec;
 extern ogg_codec_t ogm_video_codec;
 extern ogg_codec_t ogm_audio_codec;
+extern ogg_codec_t ogm_text_codec;
 extern ogg_codec_t ogm_old_codec;
 
 extern int vorbis_comment(AVFormatContext *ms, uint8_t *buf, int size);

libavformat/oggparseogm.c

@@ -55,6 +55,10 @@ ogm_header(AVFormatContext *s, int idx)
         tag = bytestream_get_le32(&p);
         st->codec->codec_id = codec_get_id(codec_bmp_tags, tag);
         st->codec->codec_tag = tag;
+    } else if (*p == 't') {
+        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
+        st->codec->codec_id = CODEC_ID_TEXT;
+        p += 12;
     } else {
         uint8_t acid[5];
         int cid;
@@ -158,6 +162,13 @@ ogg_codec_t ogm_audio_codec = {
     .packet = ogm_packet
 };
 
+ogg_codec_t ogm_text_codec = {
+    .magic = "\001text",
+    .magicsize = 5,
+    .header = ogm_header,
+    .packet = ogm_packet
+};
+
 ogg_codec_t ogm_old_codec = {
     .magic = "\001Direct Show Samples embedded in Ogg",
     .magicsize = 35,