1/* 2 * Copyright (C) 2008 David Conrad 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#include "libavcodec/get_bits.h" 22#include "libavcodec/dirac.h" 23#include "avformat.h" 24#include "oggdec.h" 25 26static int dirac_header(AVFormatContext *s, int idx) 27{ 28 struct ogg *ogg = s->priv_data; 29 struct ogg_stream *os = ogg->streams + idx; 30 AVStream *st = s->streams[idx]; 31 dirac_source_params source; 32 GetBitContext gb; 33 34 // already parsed the header 35 if (st->codec->codec_id == CODEC_ID_DIRAC) 36 return 0; 37 38 init_get_bits(&gb, os->buf + os->pstart + 13, (os->psize - 13) * 8); 39 if (ff_dirac_parse_sequence_header(st->codec, &gb, &source) < 0) 40 return -1; 41 42 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 43 st->codec->codec_id = CODEC_ID_DIRAC; 44 // dirac in ogg always stores timestamps as though the video were interlaced 45 st->time_base = (AVRational){st->codec->time_base.num, 2*st->codec->time_base.den}; 46 return 1; 47} 48 49// various undocument things: granule is signed (only for dirac!) 50static uint64_t dirac_gptopts(AVFormatContext *s, int idx, uint64_t granule, 51 int64_t *dts_out) 52{ 53 int64_t gp = granule; 54 struct ogg *ogg = s->priv_data; 55 struct ogg_stream *os = ogg->streams + idx; 56 57 unsigned dist = ((gp >> 14) & 0xff00) | (gp & 0xff); 58 int64_t dts = (gp >> 31); 59 int64_t pts = dts + ((gp >> 9) & 0x1fff); 60 61 if (!dist) 62 os->pflags |= AV_PKT_FLAG_KEY; 63 64 if (dts_out) 65 *dts_out = dts; 66 67 return pts; 68} 69 70static int old_dirac_header(AVFormatContext *s, int idx) 71{ 72 struct ogg *ogg = s->priv_data; 73 struct ogg_stream *os = ogg->streams + idx; 74 AVStream *st = s->streams[idx]; 75 uint8_t *buf = os->buf + os->pstart; 76 77 if (buf[0] != 'K') 78 return 0; 79 80 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 81 st->codec->codec_id = CODEC_ID_DIRAC; 82 st->time_base.den = AV_RB32(buf+8); 83 st->time_base.num = AV_RB32(buf+12); 84 return 1; 85} 86 87static uint64_t old_dirac_gptopts(AVFormatContext *s, int idx, uint64_t gp, 88 int64_t *dts) 89{ 90 struct ogg *ogg = s->priv_data; 91 struct ogg_stream *os = ogg->streams + idx; 92 uint64_t iframe = gp >> 30; 93 uint64_t pframe = gp & 0x3fffffff; 94 95 if (!pframe) 96 os->pflags |= AV_PKT_FLAG_KEY; 97 98 return iframe + pframe; 99} 100 101const struct ogg_codec ff_dirac_codec = { 102 .magic = "BBCD\0", 103 .magicsize = 5, 104 .header = dirac_header, 105 .gptopts = dirac_gptopts, 106 .granule_is_start = 1, 107}; 108 109const struct ogg_codec ff_old_dirac_codec = { 110 .magic = "KW-DIRAC", 111 .magicsize = 8, 112 .header = old_dirac_header, 113 .gptopts = old_dirac_gptopts, 114 .granule_is_start = 1, 115}; 116