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117 lines
3.4 KiB
117 lines
3.4 KiB
/* |
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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 "internal.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 == AV_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 (avpriv_dirac_parse_sequence_header(st->codec, &gb, &source) < 0) |
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return -1; |
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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st->codec->codec_id = AV_CODEC_ID_DIRAC; |
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// dirac in ogg always stores timestamps as though the video were interlaced |
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avpriv_set_pts_info(st, 64, 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 |= AV_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 = AVMEDIA_TYPE_VIDEO; |
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st->codec->codec_id = AV_CODEC_ID_DIRAC; |
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avpriv_set_pts_info(st, 64, AV_RB32(buf+12), AV_RB32(buf+8)); |
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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 |= AV_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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.nb_header = 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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.nb_header = 1, |
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};
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