mirror of
https://github.com/FFmpeg/FFmpeg.git
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116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/*
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* Copyright (C) 2008 David Conrad
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavcodec/get_bits.h"
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#include "libavcodec/dirac.h"
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#include "avformat.h"
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#include "oggdec.h"
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static int dirac_header(AVFormatContext *s, int idx)
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{
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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AVStream *st = s->streams[idx];
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dirac_source_params source;
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GetBitContext gb;
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// already parsed the header
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if (st->codec->codec_id == CODEC_ID_DIRAC)
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return 0;
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init_get_bits(&gb, os->buf + os->pstart + 13, (os->psize - 13) * 8);
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if (ff_dirac_parse_sequence_header(st->codec, &gb, &source) < 0)
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return -1;
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st->codec->codec_type = CODEC_TYPE_VIDEO;
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st->codec->codec_id = CODEC_ID_DIRAC;
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// dirac in ogg always stores timestamps as though the video were interlaced
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st->time_base = (AVRational){st->codec->time_base.num, 2*st->codec->time_base.den};
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return 1;
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}
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// various undocument things: granule is signed (only for dirac!)
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static uint64_t dirac_gptopts(AVFormatContext *s, int idx, uint64_t granule,
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int64_t *dts_out)
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{
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int64_t gp = granule;
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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unsigned dist = ((gp >> 14) & 0xff00) | (gp & 0xff);
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int64_t dts = (gp >> 31);
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int64_t pts = dts + ((gp >> 9) & 0x1fff);
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if (!dist)
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os->pflags |= PKT_FLAG_KEY;
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if (dts_out)
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*dts_out = dts;
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return pts;
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}
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static int old_dirac_header(AVFormatContext *s, int idx)
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{
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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AVStream *st = s->streams[idx];
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uint8_t *buf = os->buf + os->pstart;
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if (buf[0] != 'K')
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return 0;
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st->codec->codec_type = CODEC_TYPE_VIDEO;
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st->codec->codec_id = CODEC_ID_DIRAC;
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st->time_base.den = AV_RB32(buf+8);
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st->time_base.num = AV_RB32(buf+12);
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return 1;
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}
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static uint64_t old_dirac_gptopts(AVFormatContext *s, int idx, uint64_t gp,
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int64_t *dts)
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{
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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uint64_t iframe = gp >> 30;
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uint64_t pframe = gp & 0x3fffffff;
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if (!pframe)
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os->pflags |= PKT_FLAG_KEY;
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return iframe + pframe;
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}
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const struct ogg_codec ff_dirac_codec = {
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.magic = "BBCD\0",
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.magicsize = 5,
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.header = dirac_header,
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.gptopts = dirac_gptopts,
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.granule_is_start = 1,
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};
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const struct ogg_codec ff_old_dirac_codec = {
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.magic = "KW-DIRAC",
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.magicsize = 8,
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.header = old_dirac_header,
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.gptopts = old_dirac_gptopts,
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.granule_is_start = 1,
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};
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