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- /*
- * Copyright (C) 2008 David Conrad
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- #include "libavcodec/get_bits.h"
- #include "libavcodec/dirac.h"
- #include "avformat.h"
- #include "internal.h"
- #include "oggdec.h"
- static int dirac_header(AVFormatContext *s, int idx)
- {
- struct ogg *ogg = s->priv_data;
- struct ogg_stream *os = ogg->streams + idx;
- AVStream *st = s->streams[idx];
- dirac_source_params source;
- GetBitContext gb;
- // already parsed the header
- if (st->codec->codec_id == CODEC_ID_DIRAC)
- return 0;
- init_get_bits(&gb, os->buf + os->pstart + 13, (os->psize - 13) * 8);
- if (avpriv_dirac_parse_sequence_header(st->codec, &gb, &source) < 0)
- return -1;
- st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codec->codec_id = CODEC_ID_DIRAC;
- // dirac in ogg always stores timestamps as though the video were interlaced
- avpriv_set_pts_info(st, 64, st->codec->time_base.num, 2*st->codec->time_base.den);
- return 1;
- }
- // various undocument things: granule is signed (only for dirac!)
- static uint64_t dirac_gptopts(AVFormatContext *s, int idx, uint64_t granule,
- int64_t *dts_out)
- {
- int64_t gp = granule;
- struct ogg *ogg = s->priv_data;
- struct ogg_stream *os = ogg->streams + idx;
- unsigned dist = ((gp >> 14) & 0xff00) | (gp & 0xff);
- int64_t dts = (gp >> 31);
- int64_t pts = dts + ((gp >> 9) & 0x1fff);
- if (!dist)
- os->pflags |= AV_PKT_FLAG_KEY;
- if (dts_out)
- *dts_out = dts;
- return pts;
- }
- static int old_dirac_header(AVFormatContext *s, int idx)
- {
- struct ogg *ogg = s->priv_data;
- struct ogg_stream *os = ogg->streams + idx;
- AVStream *st = s->streams[idx];
- uint8_t *buf = os->buf + os->pstart;
- if (buf[0] != 'K')
- return 0;
- st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codec->codec_id = CODEC_ID_DIRAC;
- avpriv_set_pts_info(st, 64, AV_RB32(buf+12), AV_RB32(buf+8));
- return 1;
- }
- static uint64_t old_dirac_gptopts(AVFormatContext *s, int idx, uint64_t gp,
- int64_t *dts)
- {
- struct ogg *ogg = s->priv_data;
- struct ogg_stream *os = ogg->streams + idx;
- uint64_t iframe = gp >> 30;
- uint64_t pframe = gp & 0x3fffffff;
- if (!pframe)
- os->pflags |= AV_PKT_FLAG_KEY;
- return iframe + pframe;
- }
- const struct ogg_codec ff_dirac_codec = {
- .magic = "BBCD\0",
- .magicsize = 5,
- .header = dirac_header,
- .gptopts = dirac_gptopts,
- .granule_is_start = 1,
- };
- const struct ogg_codec ff_old_dirac_codec = {
- .magic = "KW-DIRAC",
- .magicsize = 8,
- .header = old_dirac_header,
- .gptopts = old_dirac_gptopts,
- .granule_is_start = 1,
- };
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