yading@11: /*
yading@11:  * Copyright (C) 2008  David Conrad
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavcodec/get_bits.h"
yading@11: #include "libavcodec/dirac.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "oggdec.h"
yading@11: 
yading@11: static int dirac_header(AVFormatContext *s, int idx)
yading@11: {
yading@11:     struct ogg *ogg = s->priv_data;
yading@11:     struct ogg_stream *os = ogg->streams + idx;
yading@11:     AVStream *st = s->streams[idx];
yading@11:     dirac_source_params source;
yading@11:     GetBitContext gb;
yading@11: 
yading@11:     // already parsed the header
yading@11:     if (st->codec->codec_id == AV_CODEC_ID_DIRAC)
yading@11:         return 0;
yading@11: 
yading@11:     init_get_bits(&gb, os->buf + os->pstart + 13, (os->psize - 13) * 8);
yading@11:     if (avpriv_dirac_parse_sequence_header(st->codec, &gb, &source) < 0)
yading@11:         return -1;
yading@11: 
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     st->codec->codec_id = AV_CODEC_ID_DIRAC;
yading@11:     // dirac in ogg always stores timestamps as though the video were interlaced
yading@11:     avpriv_set_pts_info(st, 64, st->codec->time_base.num, 2*st->codec->time_base.den);
yading@11:     return 1;
yading@11: }
yading@11: 
yading@11: // various undocument things: granule is signed (only for dirac!)
yading@11: static uint64_t dirac_gptopts(AVFormatContext *s, int idx, uint64_t granule,
yading@11:                               int64_t *dts_out)
yading@11: {
yading@11:     int64_t gp = granule;
yading@11:     struct ogg *ogg = s->priv_data;
yading@11:     struct ogg_stream *os = ogg->streams + idx;
yading@11: 
yading@11:     unsigned dist  = ((gp >> 14) & 0xff00) | (gp & 0xff);
yading@11:     int64_t  dts   = (gp >> 31);
yading@11:     int64_t  pts   = dts + ((gp >> 9) & 0x1fff);
yading@11: 
yading@11:     if (!dist)
yading@11:         os->pflags |= AV_PKT_FLAG_KEY;
yading@11: 
yading@11:     if (dts_out)
yading@11:         *dts_out = dts;
yading@11: 
yading@11:     return pts;
yading@11: }
yading@11: 
yading@11: static int old_dirac_header(AVFormatContext *s, int idx)
yading@11: {
yading@11:     struct ogg *ogg = s->priv_data;
yading@11:     struct ogg_stream *os = ogg->streams + idx;
yading@11:     AVStream *st = s->streams[idx];
yading@11:     uint8_t *buf = os->buf + os->pstart;
yading@11: 
yading@11:     if (buf[0] != 'K')
yading@11:         return 0;
yading@11: 
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     st->codec->codec_id = AV_CODEC_ID_DIRAC;
yading@11:     avpriv_set_pts_info(st, 64, AV_RB32(buf+12), AV_RB32(buf+8));
yading@11:     return 1;
yading@11: }
yading@11: 
yading@11: static uint64_t old_dirac_gptopts(AVFormatContext *s, int idx, uint64_t gp,
yading@11:                                   int64_t *dts)
yading@11: {
yading@11:     struct ogg *ogg = s->priv_data;
yading@11:     struct ogg_stream *os = ogg->streams + idx;
yading@11:     uint64_t iframe = gp >> 30;
yading@11:     uint64_t pframe = gp & 0x3fffffff;
yading@11: 
yading@11:     if (!pframe)
yading@11:         os->pflags |= AV_PKT_FLAG_KEY;
yading@11: 
yading@11:     return iframe + pframe;
yading@11: }
yading@11: 
yading@11: const struct ogg_codec ff_dirac_codec = {
yading@11:     .magic = "BBCD\0",
yading@11:     .magicsize = 5,
yading@11:     .header = dirac_header,
yading@11:     .gptopts = dirac_gptopts,
yading@11:     .granule_is_start = 1,
yading@11:     .nb_header = 1,
yading@11: };
yading@11: 
yading@11: const struct ogg_codec ff_old_dirac_codec = {
yading@11:     .magic = "KW-DIRAC",
yading@11:     .magicsize = 8,
yading@11:     .header = old_dirac_header,
yading@11:     .gptopts = old_dirac_gptopts,
yading@11:     .granule_is_start = 1,
yading@11:     .nb_header = 1,
yading@11: };