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| author | Aman Gupta <aman@tmm1.net> | 2017-03-15 12:53:03 -0700 |
|---|---|---|
| committer | Aman Gupta <aman@tmm1.net> | 2017-11-15 18:14:39 -0800 |
| commit | 3f1a540204a8c187f77b3805d2e1c97fa916a12b (patch) | |
| tree | ee053abea06c4989caab1185a045427bc95897d8 | |
| parent | f399172d6e842fbdd05c599cdbbb1668c8c354be (diff) | |
| download | ffmpeg-3f1a540204a8c187f77b3805d2e1c97fa916a12b.tar.gz | |
avcodec/mpeg12dec: parse A53 caption data embedded in SCTE-20 user data
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/mpeg12dec.c | 39 | ||||
| -rw-r--r-- | tests/fate/subtitles.mak | 3 | ||||
| -rw-r--r-- | tests/ref/fate/sub-cc-scte20 | 15 |
3 files changed, 57 insertions, 0 deletions
diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c index 82bb1286ff..e2a7c3f2e0 100644 --- a/libavcodec/mpeg12dec.c +++ b/libavcodec/mpeg12dec.c @@ -2240,6 +2240,45 @@ static int mpeg_decode_a53_cc(AVCodecContext *avctx, avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS; } return 1; + } else if (buf_size >= 2 && + p[0] == 0x03 && (p[1]&0x7f) == 0x01) { + /* extract SCTE-20 CC data */ + GetBitContext gb; + int cc_count = 0; + int i; + + init_get_bits(&gb, p + 2, buf_size - 2); + cc_count = get_bits(&gb, 5); + if (cc_count > 0) { + av_freep(&s1->a53_caption); + s1->a53_caption_size = cc_count * 3; + s1->a53_caption = av_mallocz(s1->a53_caption_size); + if (s1->a53_caption) { + uint8_t field, cc1, cc2; + uint8_t *cap = s1->a53_caption; + for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) { + skip_bits(&gb, 2); // priority + field = get_bits(&gb, 2); + skip_bits(&gb, 5); // line_offset + cc1 = get_bits(&gb, 8); + cc2 = get_bits(&gb, 8); + skip_bits(&gb, 1); // marker + + if (!field) { // forbidden + cap[0] = cap[1] = cap[2] = 0x00; + } else { + field = (field == 2 ? 1 : 0); + if (!s1->mpeg_enc_ctx.top_field_first) field = !field; + cap[0] = 0x04 | field; + cap[1] = ff_reverse[cc1]; + cap[2] = ff_reverse[cc2]; + } + cap += 3; + } + } + avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS; + } + return 1; } else if (buf_size >= 11 && p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) { /* extract DVD CC data diff --git a/tests/fate/subtitles.mak b/tests/fate/subtitles.mak index 8c310adeff..0042902161 100644 --- a/tests/fate/subtitles.mak +++ b/tests/fate/subtitles.mak @@ -7,6 +7,9 @@ fate-sub-cc: CMD = fmtstdout ass -f lavfi -i "movie=$(TARGET_SAMPLES)/sub/Closed FATE_SUBTITLES_ASS-$(call ALLYES, AVDEVICE LAVFI_INDEV CCAPTION_DECODER MOVIE_FILTER MPEGTS_DEMUXER) += fate-sub-cc-realtime fate-sub-cc-realtime: CMD = fmtstdout ass -real_time 1 -f lavfi -i "movie=$(TARGET_SAMPLES)/sub/Closedcaption_rollup.m2v[out0+subcc]" +FATE_SUBTITLES_ASS-$(call ALLYES, AVDEVICE LAVFI_INDEV CCAPTION_DECODER MOVIE_FILTER MPEGTS_DEMUXER) += fate-sub-cc-scte20 +fate-sub-cc-scte20: CMD = fmtstdout ass -f lavfi -i "movie=$(TARGET_SAMPLES)/sub/scte20.ts[out0+subcc]" + FATE_SUBTITLES_ASS-$(call DEMDEC, ASS, ASS) += fate-sub-ass-to-ass-transcode fate-sub-ass-to-ass-transcode: CMD = fmtstdout ass -i $(TARGET_SAMPLES)/sub/1ededcbd7b.ass diff --git a/tests/ref/fate/sub-cc-scte20 b/tests/ref/fate/sub-cc-scte20 new file mode 100644 index 0000000000..71fc92bfc5 --- /dev/null +++ b/tests/ref/fate/sub-cc-scte20 @@ -0,0 +1,15 @@ +[Script Info]
+; Script generated by FFmpeg/Lavc
+ScriptType: v4.00+
+PlayResX: 384
+PlayResY: 288
+
+[V4+ Styles]
+Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
+Style: Default,Monospace,16,&Hffffff,&Hffffff,&H0,&H0,0,0,0,0,100,100,0,0,3,1,0,2,10,10,10,0
+
+[Events]
+Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
+Dialogue: 0,0:00:00.00,0:00:01.44,Default,,0,0,0,,{\an7}{\pos(48,182)}BESIDES THE
+Dialogue: 0,0:00:01.43,0:00:03.93,Default,,0,0,0,,{\an7}{\pos(38,166)}\hBESIDES THE \N{\an7}{\pos(38,197)}SPENDING AND THIS, IS THAT CAR
+Dialogue: 0,0:00:03.94,0:00:06.31,Default,,0,0,0,,{\an7}{\pos(38,182)}SPENDING AND THIS, IS THAT CAR \N{\an7}{\pos(38,197)}MANUFACTURERS ARE ABOUT AS
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