lavf/mccdec: clean up, add support for mcc 2.0 features, and add SMPTE_436M_ANC output stream
Signed-off-by: Jacob Lifshay <programmerjake@gmail.com>
This commit is contained in:
Jacob Lifshay
parent
a18d5a766d
commit
ceb9688fee
3 changed files with 325 additions and 87 deletions
1
configure
vendored
1
configure
vendored
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@ -3726,6 +3726,7 @@ matroska_audio_muxer_select="matroska_muxer"
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matroska_demuxer_select="riffdec"
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matroska_demuxer_suggest="bzlib zlib"
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matroska_muxer_select="iso_writer mpeg4audio riffenc aac_adtstoasc_bsf pgs_frame_merge_bsf vp9_superframe_bsf"
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mcc_demuxer_select="smpte_436m"
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mlp_demuxer_select="mlp_parser"
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mmf_muxer_select="riffenc"
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mov_demuxer_select="iso_media riffdec"
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@ -855,6 +855,32 @@ Set the sample rate for libopenmpt to output.
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Range is from 1000 to INT_MAX. The value default is 48000.
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@end table
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@anchor{mccdec}
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@section mcc
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Demuxer for MacCaption MCC files, it supports MCC versions 1.0 and 2.0.
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MCC files store VANC data, which can include closed captions (EIA-608 and CEA-708), ancillary time code, pan-scan data, etc.
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By default, for backward compatibility, the MCC demuxer extracts just the EIA-608 and CEA-708 closed captions and returns a @code{EIA_608} stream, ignoring all other VANC data.
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You can change it to return all VANC data in a @code{SMPTE_436M_ANC} data stream by setting @option{-eia608_extract 0}
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@subsection Examples
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@itemize
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@item
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Convert a MCC file to Scenarist (SCC) format:
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@example
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ffmpeg -i CC.mcc -c:s copy CC.scc
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@end example
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Note that the SCC format only supports EIA-608, so this will discard all other data such as CEA-708 extensions.
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@item
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Merge a MCC file into a MXF file:
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@example
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ffmpeg -i video_and_audio.mxf -eia608_extract 0 -i CC.mcc -c copy -map 0 -map 1 out.mxf
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@end example
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This retains all VANC data and inserts it into the output MXF file as a @code{SMPTE_436M_ANC} data stream.
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@end itemize
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@section mov/mp4/3gp
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Demuxer for Quicktime File Format & ISO/IEC Base Media File Format (ISO/IEC 14496-12 or MPEG-4 Part 12, ISO/IEC 15444-12 or JPEG 2000 Part 12).
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@ -1,6 +1,7 @@
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/*
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* MCC subtitle demuxer
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* Copyright (c) 2020 Paul B Mahol
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* Copyright (c) 2025 Jacob Lifshay
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*
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* This file is part of FFmpeg.
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*
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@ -22,18 +23,32 @@
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#include "avformat.h"
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#include "demux.h"
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#include "internal.h"
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#include "subtitles.h"
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#include "libavcodec/bytestream.h"
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#include "libavcodec/codec_id.h"
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#include "libavcodec/smpte_436m.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bprint.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/avutil.h"
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#include "libavutil/error.h"
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#include "libavutil/internal.h"
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#include "libavutil/log.h"
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#include "libavutil/macros.h"
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#include "libavutil/opt.h"
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#include "libavutil/rational.h"
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#include "libavutil/timecode.h"
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#include "subtitles.h"
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#include <inttypes.h>
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#include <stdbool.h>
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#include <string.h>
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typedef struct MCCContext {
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const AVClass *class;
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int eia608_extract;
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FFDemuxSubtitlesQueue q;
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} MCCContext;
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static int mcc_probe(const AVProbeData *p)
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{
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char buf[28];
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char buf[28];
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FFTextReader tr;
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ff_text_init_buf(&tr, p->buf, p->buf_size);
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@ -61,21 +76,27 @@ static int convert(uint8_t x)
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}
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typedef struct alias {
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uint8_t key;
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int len;
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uint8_t key;
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int len;
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const char *value;
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} alias;
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#define CCPAD "\xFA\x0\x0"
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#define CCPAD3 CCPAD CCPAD CCPAD
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static const char cc_pad[27] = CCPAD3 CCPAD3 CCPAD3;
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static const alias aliases[20] = {
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{ .key = 16, .len = 3, .value = "\xFA\x0\x0", },
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{ .key = 17, .len = 6, .value = "\xFA\x0\x0\xFA\x0\x0", },
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{ .key = 18, .len = 9, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
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{ .key = 19, .len = 12, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
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{ .key = 20, .len = 15, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
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{ .key = 21, .len = 18, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
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{ .key = 22, .len = 21, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
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{ .key = 23, .len = 24, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
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{ .key = 24, .len = 27, .value = "\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0\xFA\x0\x0", },
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// clang-format off
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{ .key = 16, .len = 3, .value = cc_pad, },
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{ .key = 17, .len = 6, .value = cc_pad, },
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{ .key = 18, .len = 9, .value = cc_pad, },
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{ .key = 19, .len = 12, .value = cc_pad, },
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{ .key = 20, .len = 15, .value = cc_pad, },
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{ .key = 21, .len = 18, .value = cc_pad, },
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{ .key = 22, .len = 21, .value = cc_pad, },
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{ .key = 23, .len = 24, .value = cc_pad, },
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{ .key = 24, .len = 27, .value = cc_pad, },
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{ .key = 25, .len = 3, .value = "\xFB\x80\x80", },
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{ .key = 26, .len = 3, .value = "\xFC\x80\x80", },
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{ .key = 27, .len = 3, .value = "\xFD\x80\x80", },
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@ -87,113 +108,266 @@ static const alias aliases[20] = {
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{ .key = 33, .len = 0, .value = NULL, },
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{ .key = 34, .len = 0, .value = NULL, },
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{ .key = 35, .len = 1, .value = "\x0", },
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// clang-format on
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};
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typedef struct TimeTracker {
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int64_t last_ts;
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int64_t twenty_four_hr;
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AVTimecode timecode;
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} TimeTracker;
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static int time_tracker_init(TimeTracker *tt, AVStream *st, AVRational rate, void *log_ctx)
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{
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*tt = (TimeTracker){ .last_ts = 0 };
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int ret = av_timecode_init(&tt->timecode, rate, rate.den == 1001 ? AV_TIMECODE_FLAG_DROPFRAME : 0, 0, log_ctx);
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if (ret < 0)
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return ret;
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// wrap pts values at 24hr ourselves since they can be bigger than fits in an int
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AVTimecode twenty_four_hr;
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ret = av_timecode_init_from_components(&twenty_four_hr, rate, tt->timecode.flags, 24, 0, 0, 0, log_ctx);
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if (ret < 0)
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return ret;
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tt->twenty_four_hr = twenty_four_hr.start;
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// timecode uses reciprocal of timebase
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avpriv_set_pts_info(st, 64, rate.den, rate.num);
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return 0;
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}
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typedef struct MCCTimecode {
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unsigned hh, mm, ss, ff, field, line_number;
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} MCCTimecode;
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static int time_tracker_set_time(TimeTracker *tt, const MCCTimecode *tc, void *log_ctx)
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{
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AVTimecode last = tt->timecode;
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int ret = av_timecode_init_from_components(&tt->timecode, last.rate, last.flags, tc->hh, tc->mm, tc->ss, tc->ff, log_ctx);
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if (ret < 0) {
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tt->timecode = last;
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return ret;
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}
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tt->last_ts -= last.start;
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tt->last_ts += tt->timecode.start;
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if (tt->timecode.start < last.start)
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tt->last_ts += tt->twenty_four_hr;
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return 0;
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}
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struct ValidTimeCodeRate {
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AVRational rate;
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const char *str;
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};
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static struct ValidTimeCodeRate valid_time_code_rates[] = {
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{ .rate = { .num = 24, .den = 1 }, .str = "24" },
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{ .rate = { .num = 25, .den = 1 }, .str = "25" },
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{ .rate = { .num = 30000, .den = 1001 }, .str = "30DF" },
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{ .rate = { .num = 30, .den = 1 }, .str = "30" },
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{ .rate = { .num = 50, .den = 1 }, .str = "50" },
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{ .rate = { .num = 60000, .den = 1001 }, .str = "60DF" },
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{ .rate = { .num = 60, .den = 1 }, .str = "60" },
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};
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static int parse_time_code_rate(AVFormatContext *s, AVStream *st, TimeTracker *tt, const char *time_code_rate)
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{
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for (size_t i = 0; i < FF_ARRAY_ELEMS(valid_time_code_rates); i++) {
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const char *after;
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if (av_stristart(time_code_rate, valid_time_code_rates[i].str, &after) != 0) {
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bool bad_after = false;
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for (; *after; after++) {
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if (!av_isspace(*after)) {
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bad_after = true;
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break;
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}
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}
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if (bad_after)
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continue;
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return time_tracker_init(tt, st, valid_time_code_rates[i].rate, s);
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}
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}
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av_log(s, AV_LOG_FATAL, "invalid mcc time code rate: %s", time_code_rate);
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return AVERROR_INVALIDDATA;
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}
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static int mcc_parse_time_code_part(char **line_left, unsigned *value, unsigned max, const char *after_set)
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{
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*value = 0;
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if (!av_isdigit(**line_left))
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return AVERROR_INVALIDDATA;
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while (av_isdigit(**line_left)) {
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unsigned digit = **line_left - '0';
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*value = *value * 10 + digit;
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++*line_left;
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if (*value > max)
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return AVERROR_INVALIDDATA;
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}
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unsigned char after = **line_left;
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if (!after || !strchr(after_set, after))
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return AVERROR_INVALIDDATA;
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++*line_left;
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return after;
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}
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static int mcc_parse_time_code(char **line_left, MCCTimecode *tc)
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{
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*tc = (MCCTimecode){ .field = 0, .line_number = 9 };
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int ret = mcc_parse_time_code_part(line_left, &tc->hh, 23, ":");
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if (ret < 0)
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return ret;
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ret = mcc_parse_time_code_part(line_left, &tc->mm, 59, ":");
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if (ret < 0)
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return ret;
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ret = mcc_parse_time_code_part(line_left, &tc->ss, 59, ":;");
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if (ret < 0)
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return ret;
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ret = mcc_parse_time_code_part(line_left, &tc->ff, 59, ".\t");
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if (ret < 0)
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return ret;
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if (ret == '.') {
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ret = mcc_parse_time_code_part(line_left, &tc->field, 1, ",\t");
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if (ret < 0)
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return ret;
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if (ret == ',') {
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ret = mcc_parse_time_code_part(line_left, &tc->line_number, 0xFFFF, "\t");
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if (ret < 0)
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return ret;
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}
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}
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if (ret != '\t')
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return AVERROR_INVALIDDATA;
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return 0;
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}
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static int mcc_read_header(AVFormatContext *s)
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{
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MCCContext *mcc = s->priv_data;
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AVStream *st = avformat_new_stream(s, NULL);
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AVRational rate = {0};
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int64_t ts, pos;
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uint8_t out[4096];
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char line[4096];
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MCCContext *mcc = s->priv_data;
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AVStream *st = avformat_new_stream(s, NULL);
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int64_t pos;
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AVSmpte436mCodedAnc coded_anc = {
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.payload_sample_coding = AV_SMPTE_436M_PAYLOAD_SAMPLE_CODING_8BIT_LUMA,
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};
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char line[4096];
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FFTextReader tr;
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int ret = 0;
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int ret = 0;
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ff_text_init_avio(s, &tr, s->pb);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
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avpriv_set_pts_info(st, 64, 1, 30);
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if (mcc->eia608_extract) {
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st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
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} else {
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st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
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st->codecpar->codec_id = AV_CODEC_ID_SMPTE_436M_ANC;
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av_dict_set(&st->metadata, "data_type", "vbi_vanc_smpte_436M", 0);
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}
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TimeTracker tt;
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ret = time_tracker_init(&tt, st, (AVRational){ .num = 30, .den = 1 }, s);
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if (ret < 0)
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return ret;
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while (!ff_text_eof(&tr)) {
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int hh, mm, ss, fs, i = 0, j = 0;
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int start = 12, count = 0;
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AVPacket *sub;
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char *lline;
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pos = ff_text_pos(&tr);
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ff_subtitles_read_line(&tr, line, sizeof(line));
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if (!strncmp(line, "File Format=MacCaption_MCC V", 28))
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continue;
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if (!strncmp(line, "//", 2))
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continue;
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if (!strncmp(line, "Time Code Rate=", 15)) {
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char *rate_str = line + 15;
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char *df = NULL;
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int num = -1, den = -1;
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if (rate_str[0]) {
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num = strtol(rate_str, &df, 10);
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den = 1;
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if (df && !av_strncasecmp(df, "DF", 2)) {
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av_reduce(&num, &den, num * 1000LL, 1001, INT_MAX);
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}
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}
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if (num > 0 && den > 0) {
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rate = av_make_q(num, den);
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avpriv_set_pts_info(st, 64, rate.den, rate.num);
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}
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ret = parse_time_code_rate(s, st, &tt, line + 15);
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if (ret < 0)
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return ret;
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continue;
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}
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if (strchr(line, '='))
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continue; // skip attributes
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char *line_left = line;
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while (av_isspace(*line_left))
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line_left++;
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if (!*line_left) // skip empty lines
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continue;
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MCCTimecode tc;
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ret = mcc_parse_time_code(&line_left, &tc);
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if (ret < 0) {
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av_log(s, AV_LOG_ERROR, "can't parse mcc time code");
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continue;
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}
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if (av_sscanf(line, "%d:%d:%d:%d", &hh, &mm, &ss, &fs) != 4 || rate.den <= 0)
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int64_t last_pts = tt.last_ts;
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ret = time_tracker_set_time(&tt, &tc, s);
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if (ret < 0)
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continue;
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bool merge = last_pts == tt.last_ts;
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ts = av_sat_add64(av_rescale(hh * 3600LL + mm * 60LL + ss, rate.num, rate.den), fs);
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coded_anc.line_number = tc.line_number;
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coded_anc.wrapping_type = tc.field ? AV_SMPTE_436M_WRAPPING_TYPE_VANC_FIELD_2 : AV_SMPTE_436M_WRAPPING_TYPE_VANC_FRAME;
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lline = (char *)&line;
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lline += 12;
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pos = ff_text_pos(&tr);
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PutByteContext pb;
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bytestream2_init_writer(&pb, coded_anc.payload, AV_SMPTE_436M_CODED_ANC_PAYLOAD_CAPACITY);
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while (lline[i]) {
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uint8_t v = convert(lline[i]);
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while (*line_left) {
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uint8_t v = convert(*line_left++);
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if (v >= 16 && v <= 35) {
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int idx = v - 16;
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if (aliases[idx].len) {
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if (j >= sizeof(out) - 1 - aliases[idx].len) {
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j = 0;
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break;
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}
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memcpy(out + j, aliases[idx].value, aliases[idx].len);
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j += aliases[idx].len;
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}
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bytestream2_put_buffer(&pb, aliases[idx].value, aliases[idx].len);
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} else {
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uint8_t vv;
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if (i + 13 >= sizeof(line) - 1)
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if (!*line_left)
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break;
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||||
vv = convert(lline[i + 1]);
|
||||
if (j >= sizeof(out) - 1) {
|
||||
j = 0;
|
||||
break;
|
||||
}
|
||||
out[j++] = vv | (v << 4);
|
||||
i++;
|
||||
vv = convert(*line_left++);
|
||||
bytestream2_put_byte(&pb, vv | (v << 4));
|
||||
}
|
||||
|
||||
i++;
|
||||
}
|
||||
out[j] = 0;
|
||||
|
||||
if (out[7] & 0x80)
|
||||
start += 4;
|
||||
count = (out[11] & 0x1f) * 3;
|
||||
if (j < start + count + 1)
|
||||
if (pb.eof)
|
||||
continue;
|
||||
|
||||
if (!count)
|
||||
// remove trailing ANC checksum byte (not to be confused with the CDP checksum byte),
|
||||
// it's not included in 8-bit sample encodings. see section 6.2 (page 14) of:
|
||||
// https://pub.smpte.org/latest/st436/s436m-2006.pdf
|
||||
bytestream2_seek_p(&pb, -1, SEEK_CUR);
|
||||
coded_anc.payload_sample_count = bytestream2_tell_p(&pb);
|
||||
if (coded_anc.payload_sample_count == 0)
|
||||
continue; // ignore if too small
|
||||
// add padding to align to 4 bytes
|
||||
while (!pb.eof && bytestream2_tell_p(&pb) % 4)
|
||||
bytestream2_put_byte(&pb, 0);
|
||||
if (pb.eof)
|
||||
continue;
|
||||
sub = ff_subtitles_queue_insert(&mcc->q, out + start, count, 0);
|
||||
if (!sub)
|
||||
return AVERROR(ENOMEM);
|
||||
coded_anc.payload_array_length = bytestream2_tell_p(&pb);
|
||||
|
||||
sub->pos = pos;
|
||||
sub->pts = ts;
|
||||
AVPacket *sub;
|
||||
if (mcc->eia608_extract) {
|
||||
AVSmpte291mAnc8bit anc;
|
||||
if (av_smpte_291m_anc_8bit_decode(
|
||||
&anc, coded_anc.payload_sample_coding, coded_anc.payload_sample_count, coded_anc.payload, s)
|
||||
< 0)
|
||||
continue;
|
||||
// reuse line
|
||||
int cc_count = av_smpte_291m_anc_8bit_extract_cta_708(&anc, line, s);
|
||||
if (cc_count < 0) // continue if error or if it's not a closed captions packet
|
||||
continue;
|
||||
int len = cc_count * 3;
|
||||
|
||||
sub = ff_subtitles_queue_insert(&mcc->q, line, len, merge);
|
||||
if (!sub)
|
||||
return AVERROR(ENOMEM);
|
||||
} else {
|
||||
sub = ff_subtitles_queue_insert(&mcc->q, NULL, 0, merge);
|
||||
if (!sub)
|
||||
return AVERROR(ENOMEM);
|
||||
|
||||
ret = av_smpte_436m_anc_append(sub, 1, &coded_anc);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
sub->pos = pos;
|
||||
sub->pts = tt.last_ts;
|
||||
sub->duration = 1;
|
||||
continue;
|
||||
}
|
||||
|
||||
ff_subtitles_queue_finalize(s, &mcc->q);
|
||||
|
|
@ -201,15 +375,52 @@ static int mcc_read_header(AVFormatContext *s)
|
|||
return ret;
|
||||
}
|
||||
|
||||
static int mcc_read_packet(AVFormatContext *s, AVPacket *pkt)
|
||||
{
|
||||
MCCContext *mcc = s->priv_data;
|
||||
return ff_subtitles_queue_read_packet(&mcc->q, pkt);
|
||||
}
|
||||
|
||||
static int mcc_read_seek(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
|
||||
{
|
||||
MCCContext *mcc = s->priv_data;
|
||||
return ff_subtitles_queue_seek(&mcc->q, s, stream_index, min_ts, ts, max_ts, flags);
|
||||
}
|
||||
|
||||
static int mcc_read_close(AVFormatContext *s)
|
||||
{
|
||||
MCCContext *mcc = s->priv_data;
|
||||
ff_subtitles_queue_clean(&mcc->q);
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define OFFSET(x) offsetof(MCCContext, x)
|
||||
#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
|
||||
// clang-format off
|
||||
static const AVOption mcc_options[] = {
|
||||
{ "eia608_extract", "extract EIA-608/708 captions from VANC packets", OFFSET(eia608_extract), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, SD },
|
||||
{ NULL },
|
||||
};
|
||||
// clang-format on
|
||||
|
||||
static const AVClass mcc_class = {
|
||||
.class_name = "mcc demuxer",
|
||||
.item_name = av_default_item_name,
|
||||
.option = mcc_options,
|
||||
.version = LIBAVUTIL_VERSION_INT,
|
||||
.category = AV_CLASS_CATEGORY_DEMUXER,
|
||||
};
|
||||
|
||||
const FFInputFormat ff_mcc_demuxer = {
|
||||
.p.name = "mcc",
|
||||
.p.long_name = NULL_IF_CONFIG_SMALL("MacCaption"),
|
||||
.p.extensions = "mcc",
|
||||
.p.priv_class = &mcc_class,
|
||||
.priv_data_size = sizeof(MCCContext),
|
||||
.flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
|
||||
.read_probe = mcc_probe,
|
||||
.read_header = mcc_read_header,
|
||||
.read_packet = ff_subtitles_read_packet,
|
||||
.read_seek2 = ff_subtitles_read_seek,
|
||||
.read_close = ff_subtitles_read_close,
|
||||
.read_packet = mcc_read_packet,
|
||||
.read_seek2 = mcc_read_seek,
|
||||
.read_close = mcc_read_close,
|
||||
};
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue