IVTV subtitle support

The packet starts 'IVT0' or 'ivt0' see https://github.com/MythTV/mythtv/blob/master/mythtv/libs/libmythtv/decoders/avformatdecoder.cpp for more details. 'I' = 0x49, 'i' = 0x69
MythTV · Dec 3, 2021 · f51e782 · f51e782
1 parent 9fa7dd5
commit f51e782
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diff --git a/mythtv/external/FFmpeg/libavcodec/codec_id.h b/mythtv/external/FFmpeg/libavcodec/codec_id.h
@@ -548,6 +548,11 @@ enum AVCodecID {
     AV_CODEC_ID_TTML,
     AV_CODEC_ID_ARIB_CAPTION,
 
+    /* MythTV */
+    /* teletext codecs */
+    AV_CODEC_ID_MPEG2VBI,
+    AV_CODEC_ID_DVB_VBI,
+
     /* other specific kind of codecs (generally used for attachments) */
     AV_CODEC_ID_FIRST_UNKNOWN = 0x18000,           ///< A dummy ID pointing at the start of various fake codecs.
     AV_CODEC_ID_TTF = 0x18000,

diff --git a/mythtv/external/FFmpeg/libavformat/mpeg.c b/mythtv/external/FFmpeg/libavformat/mpeg.c
@@ -603,6 +603,9 @@ static int mpegps_read_packet(AVFormatContext *s,
     } else if (startcode >= 0x20 && startcode <= 0x3f) {
         type     = AVMEDIA_TYPE_SUBTITLE;
         codec_id = AV_CODEC_ID_DVD_SUBTITLE;
+    } else if (startcode == 0x69 || startcode == 0x49) {
+        type     = AVMEDIA_TYPE_DATA;
+        codec_id = AV_CODEC_ID_MPEG2VBI;
     } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
         type     = AVMEDIA_TYPE_VIDEO;
         codec_id = AV_CODEC_ID_VC1;