libavformat/oggparseogm.c

   1 /**
   2     Copyright (C) 2005  Michael Ahlberg, Måns Rullgård
   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/get_bits.h"
  28 #include "libavcodec/bytestream.h"
  29 #include "avformat.h"
  30 #include "oggdec.h"
  31 #include "riff.h"
  32
  33 static int
  34 ogm_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
 100 static int
 101 ogm_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
 134 static int
 135 ogm_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
 152 const struct ogg_codec ff_ogm_video_codec = {
 153     .magic = "\001video",
 154     .magicsize = 6,
 155     .header = ogm_header,
 156     .packet = ogm_packet
 157 };
 158
 159 const struct ogg_codec ff_ogm_audio_codec = {
 160     .magic = "\001audio",
 161     .magicsize = 6,
 162     .header = ogm_header,
 163     .packet = ogm_packet
 164 };
 165
 166 const struct ogg_codec ff_ogm_text_codec = {
 167     .magic = "\001text",
 168     .magicsize = 5,
 169     .header = ogm_header,
 170     .packet = ogm_packet
 171 };
 172
 173 const 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 };