1/** 2 Copyright (C) 2005 Michael Ahlberg, M��ns Rullg��rd 3 4 Permission is hereby granted, free of charge, to any person 5 obtaining a copy of this software and associated documentation 6 files (the "Software"), to deal in the Software without 7 restriction, including without limitation the rights to use, copy, 8 modify, merge, publish, distribute, sublicense, and/or sell copies 9 of the Software, and to permit persons to whom the Software is 10 furnished to do so, subject to the following conditions: 11 12 The above copyright notice and this permission notice shall be 13 included in all copies or substantial portions of the Software. 14 15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 17 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 18 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 19 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 20 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 DEALINGS IN THE SOFTWARE. 23**/ 24 25#include <stdlib.h> 26#include "libavutil/intreadwrite.h" 27#include "libavcodec/bitstream.h" 28#include "libavcodec/bytestream.h" 29#include "avformat.h" 30#include "oggdec.h" 31#include "riff.h" 32 33static int 34ogm_header(AVFormatContext *s, int idx) 35{ 36 struct ogg *ogg = s->priv_data; 37 struct ogg_stream *os = ogg->streams + idx; 38 AVStream *st = s->streams[idx]; 39 const uint8_t *p = os->buf + os->pstart; 40 uint64_t time_unit; 41 uint64_t spu; 42 uint32_t default_len; 43 44 if(!(*p & 1)) 45 return 0; 46 if(*p != 1) 47 return 1; 48 49 p++; 50 51 if(*p == 'v'){ 52 int tag; 53 st->codec->codec_type = CODEC_TYPE_VIDEO; 54 p += 8; 55 tag = bytestream_get_le32(&p); 56 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag); 57 st->codec->codec_tag = tag; 58 } else if (*p == 't') { 59 st->codec->codec_type = CODEC_TYPE_SUBTITLE; 60 st->codec->codec_id = CODEC_ID_TEXT; 61 p += 12; 62 } else { 63 uint8_t acid[5]; 64 int cid; 65 st->codec->codec_type = CODEC_TYPE_AUDIO; 66 p += 8; 67 bytestream_get_buffer(&p, acid, 4); 68 acid[4] = 0; 69 cid = strtol(acid, NULL, 16); 70 st->codec->codec_id = codec_get_id(codec_wav_tags, cid); 71 st->need_parsing = AVSTREAM_PARSE_FULL; 72 } 73 74 p += 4; /* useless size field */ 75 76 time_unit = bytestream_get_le64(&p); 77 spu = bytestream_get_le64(&p); 78 default_len = bytestream_get_le32(&p); 79 80 p += 8; /* buffersize + bits_per_sample */ 81 82 if(st->codec->codec_type == CODEC_TYPE_VIDEO){ 83 st->codec->width = bytestream_get_le32(&p); 84 st->codec->height = bytestream_get_le32(&p); 85 st->codec->time_base.den = spu * 10000000; 86 st->codec->time_base.num = time_unit; 87 st->time_base = st->codec->time_base; 88 } else { 89 st->codec->channels = bytestream_get_le16(&p); 90 p += 2; /* block_align */ 91 st->codec->bit_rate = bytestream_get_le32(&p) * 8; 92 st->codec->sample_rate = spu * 10000000 / time_unit; 93 st->time_base.num = 1; 94 st->time_base.den = st->codec->sample_rate; 95 } 96 97 return 1; 98} 99 100static int 101ogm_dshow_header(AVFormatContext *s, int idx) 102{ 103 struct ogg *ogg = s->priv_data; 104 struct ogg_stream *os = ogg->streams + idx; 105 AVStream *st = s->streams[idx]; 106 uint8_t *p = os->buf + os->pstart; 107 uint32_t t; 108 109 if(!(*p & 1)) 110 return 0; 111 if(*p != 1) 112 return 1; 113 114 t = AV_RL32(p + 96); 115 116 if(t == 0x05589f80){ 117 st->codec->codec_type = CODEC_TYPE_VIDEO; 118 st->codec->codec_id = codec_get_id(codec_bmp_tags, AV_RL32(p + 68)); 119 st->codec->time_base.den = 10000000; 120 st->codec->time_base.num = AV_RL64(p + 164); 121 st->codec->width = AV_RL32(p + 176); 122 st->codec->height = AV_RL32(p + 180); 123 } else if(t == 0x05589f81){ 124 st->codec->codec_type = CODEC_TYPE_AUDIO; 125 st->codec->codec_id = codec_get_id(codec_wav_tags, AV_RL16(p + 124)); 126 st->codec->channels = AV_RL16(p + 126); 127 st->codec->sample_rate = AV_RL32(p + 128); 128 st->codec->bit_rate = AV_RL32(p + 132) * 8; 129 } 130 131 return 1; 132} 133 134static int 135ogm_packet(AVFormatContext *s, int idx) 136{ 137 struct ogg *ogg = s->priv_data; 138 struct ogg_stream *os = ogg->streams + idx; 139 uint8_t *p = os->buf + os->pstart; 140 int lb; 141 142 if(*p & 8) 143 os->pflags |= PKT_FLAG_KEY; 144 145 lb = ((*p & 2) << 1) | ((*p >> 6) & 3); 146 os->pstart += lb + 1; 147 os->psize -= lb + 1; 148 149 return 0; 150} 151 152const struct ogg_codec ff_ogm_video_codec = { 153 .magic = "\001video", 154 .magicsize = 6, 155 .header = ogm_header, 156 .packet = ogm_packet 157}; 158 159const struct ogg_codec ff_ogm_audio_codec = { 160 .magic = "\001audio", 161 .magicsize = 6, 162 .header = ogm_header, 163 .packet = ogm_packet 164}; 165 166const struct ogg_codec ff_ogm_text_codec = { 167 .magic = "\001text", 168 .magicsize = 5, 169 .header = ogm_header, 170 .packet = ogm_packet 171}; 172 173const struct ogg_codec ff_ogm_old_codec = { 174 .magic = "\001Direct Show Samples embedded in Ogg", 175 .magicsize = 35, 176 .header = ogm_dshow_header, 177 .packet = ogm_packet 178}; 179