[FFmpeg-devel] [PATCH] Support detecting and demuxing EIA-608 subtitles in mov.

[Reimar Döffinger]

The format is slightly proprietary.
DVDs use a format of
code byte (0x00, 0x01, 0xfe or 0xff), two data bytes
MOV uses instead
cdat/cdt2 atom, two data bytes
Auto-detecting and supporting both in one decoder is trivial,
so a single codec ID is used.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger at gmx.de>
---
 libavcodec/avcodec.h |    1 +
 libavformat/isom.c   |    1 +
 libavformat/mov.c    |    4 +++-
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index ea833d0..a53f2c6 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -414,6 +414,7 @@ enum CodecID {
     CODEC_ID_DVB_TELETEXT,
     CODEC_ID_SRT,
     CODEC_ID_MICRODVD   = MKBETAG('m','D','V','D'),
+    CODEC_ID_EIA_608    = MKBETAG('c','6','0','8'),
 
     /* other specific kind of codecs (generally used for attachments) */
     CODEC_ID_FIRST_UNKNOWN = 0x18000,           ///< A dummy ID pointing at the start of various fake codecs.
diff --git a/libavformat/isom.c b/libavformat/isom.c
index 9182008..34daeae 100644
--- a/libavformat/isom.c
+++ b/libavformat/isom.c
@@ -287,6 +287,7 @@ const AVCodecTag ff_codec_movaudio_tags[] = {
 const AVCodecTag ff_codec_movsubtitle_tags[] = {
     { CODEC_ID_MOV_TEXT, MKTAG('t', 'e', 'x', 't') },
     { CODEC_ID_MOV_TEXT, MKTAG('t', 'x', '3', 'g') },
+    { CODEC_ID_EIA_608,  MKTAG('c', '6', '0', '8') },
     { CODEC_ID_NONE, 0 },
 };
 
diff --git a/libavformat/mov.c b/libavformat/mov.c
index b5d6516..9796c95 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -1222,7 +1222,9 @@ int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)
                 id = ff_codec_get_id(ff_codec_bmp_tags, format);
             if (id > 0)
                 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
-            else if (st->codec->codec_type == AVMEDIA_TYPE_DATA){
+            else if (st->codec->codec_type == AVMEDIA_TYPE_DATA ||
+                     (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
+                      st->codec->codec_id == CODEC_ID_NONE)){
                 id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);
                 if (id > 0)
                     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
-- 
1.7.9.5