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 "internal.h"
  31 #include "oggdec.h"
  32 #include "riff.h"
  33
  34 static int
  35 ogm_header(AVFormatContext *s, int idx)
  36 {
  37     struct ogg *ogg = s->priv_data;
  38     struct ogg_stream *os = ogg->streams + idx;
  39     AVStream *st = s->streams[idx];
  40     const uint8_t *p = os->buf + os->pstart;
  41     uint64_t time_unit;
  42     uint64_t spu;
  43
  44     if(!(*p & 1))
  45         return 0;
  46
  47     if(*p == 1) {
  48         p++;
  49
  50         if(*p == 'v'){
  51             int tag;
  52             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  53             p += 8;
  54             tag = bytestream_get_le32(&p);
  55             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag);
  56             st->codec->codec_tag = tag;
  57         } else if (*p == 't') {
  58             st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
  59             st->codec->codec_id = AV_CODEC_ID_TEXT;
  60             p += 12;
  61         } else {
  62             uint8_t acid[5];
  63             int cid;
  64             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  65             p += 8;
  66             bytestream_get_buffer(&p, acid, 4);
  67             acid[4] = 0;
  68             cid = strtol(acid, NULL, 16);
  69             st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, cid);
  70             st->need_parsing = AVSTREAM_PARSE_FULL;
  71         }
  72
  73         p += 4;                     /* useless size field */
  74
  75         time_unit   = bytestream_get_le64(&p);
  76         spu         = bytestream_get_le64(&p);
  77         p += 4;                     /* default_len */
  78         p += 8;                     /* buffersize + bits_per_sample */
  79
  80         if(st->codec->codec_type == AVMEDIA_TYPE_VIDEO){
  81             st->codec->width = bytestream_get_le32(&p);
  82             st->codec->height = bytestream_get_le32(&p);
  83             avpriv_set_pts_info(st, 64, time_unit, spu * 10000000);
  84         } else {
  85             st->codec->channels = bytestream_get_le16(&p);
  86             p += 2;                 /* block_align */
  87             st->codec->bit_rate = bytestream_get_le32(&p) * 8;
  88             st->codec->sample_rate = spu * 10000000 / time_unit;
  89             avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  90         }
  91     } else if (*p == 3) {
  92         if (os->psize > 8)
  93             ff_vorbis_comment(s, &st->metadata, p+7, os->psize-8);
  94     }
  95
  96     return 1;
  97 }
  98
  99 static int
 100 ogm_dshow_header(AVFormatContext *s, int idx)
 101 {
 102     struct ogg *ogg = s->priv_data;
 103     struct ogg_stream *os = ogg->streams + idx;
 104     AVStream *st = s->streams[idx];
 105     uint8_t *p = os->buf + os->pstart;
 106     uint32_t t;
 107
 108     if(!(*p & 1))
 109         return 0;
 110     if(*p != 1)
 111         return 1;
 112
 113     t = AV_RL32(p + 96);
 114
 115     if(t == 0x05589f80){
 116         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
 117         st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(p + 68));
 118         avpriv_set_pts_info(st, 64, AV_RL64(p + 164), 10000000);
 119         st->codec->width = AV_RL32(p + 176);
 120         st->codec->height = AV_RL32(p + 180);
 121     } else if(t == 0x05589f81){
 122         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 123         st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, AV_RL16(p + 124));
 124         st->codec->channels = AV_RL16(p + 126);
 125         st->codec->sample_rate = AV_RL32(p + 128);
 126         st->codec->bit_rate = AV_RL32(p + 132) * 8;
 127     }
 128
 129     return 1;
 130 }
 131
 132 static int
 133 ogm_packet(AVFormatContext *s, int idx)
 134 {
 135     struct ogg *ogg = s->priv_data;
 136     struct ogg_stream *os = ogg->streams + idx;
 137     uint8_t *p = os->buf + os->pstart;
 138     int lb;
 139
 140     if(*p & 8)
 141         os->pflags |= AV_PKT_FLAG_KEY;
 142
 143     lb = ((*p & 2) << 1) | ((*p >> 6) & 3);
 144     os->pstart += lb + 1;
 145     os->psize -= lb + 1;
 146
 147     while (lb--)
 148         os->pduration += p[lb+1] << (lb*8);
 149
 150     return 0;
 151 }
 152
 153 const struct ogg_codec ff_ogm_video_codec = {
 154     .magic = "\001video",
 155     .magicsize = 6,
 156     .header = ogm_header,
 157     .packet = ogm_packet,
 158     .granule_is_start = 1,
 159     .nb_header = 2,
 160 };
 161
 162 const struct ogg_codec ff_ogm_audio_codec = {
 163     .magic = "\001audio",
 164     .magicsize = 6,
 165     .header = ogm_header,
 166     .packet = ogm_packet,
 167     .granule_is_start = 1,
 168     .nb_header = 2,
 169 };
 170
 171 const struct ogg_codec ff_ogm_text_codec = {
 172     .magic = "\001text",
 173     .magicsize = 5,
 174     .header = ogm_header,
 175     .packet = ogm_packet,
 176     .granule_is_start = 1,
 177     .nb_header = 2,
 178 };
 179
 180 const struct ogg_codec ff_ogm_old_codec = {
 181     .magic = "\001Direct Show Samples embedded in Ogg",
 182     .magicsize = 35,
 183     .header = ogm_dshow_header,
 184     .packet = ogm_packet,
 185     .granule_is_start = 1,
 186     .nb_header = 1,
 187 };