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  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/avassert.h"
  27. #include "libavutil/intreadwrite.h"
  28. #include "libavcodec/get_bits.h"
  29. #include "libavcodec/bytestream.h"
  30. #include "avformat.h"
  31. #include "internal.h"
  32. #include "oggdec.h"
  33. #include "riff.h"
  34.  
  35. static int
  36. ogm_header(AVFormatContext *s, int idx)
  37. {
  38.     struct ogg *ogg = s->priv_data;
  39.     struct ogg_stream *os = ogg->streams + idx;
  40.     AVStream *st = s->streams[idx];
  41.     GetByteContext p;
  42.     uint64_t time_unit;
  43.     uint64_t spu;
  44.     uint32_t size;
  45.  
  46.     bytestream2_init(&p, os->buf + os->pstart, os->psize);
  47.     if (!(bytestream2_peek_byte(&p) & 1))
  48.         return 0;
  49.  
  50.     if (bytestream2_peek_byte(&p) == 1) {
  51.         bytestream2_skip(&p, 1);
  52.  
  53.         if (bytestream2_peek_byte(&p) == 'v'){
  54.             int tag;
  55.             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  56.             bytestream2_skip(&p, 8);
  57.             tag = bytestream2_get_le32(&p);
  58.             st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag);
  59.             st->codec->codec_tag = tag;
  60.         } else if (bytestream2_peek_byte(&p) == 't') {
  61.             st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
  62.             st->codec->codec_id = AV_CODEC_ID_TEXT;
  63.             bytestream2_skip(&p, 12);
  64.         } else {
  65.             uint8_t acid[5] = { 0 };
  66.             int cid;
  67.             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  68.             bytestream2_skip(&p, 8);
  69.             bytestream2_get_buffer(&p, acid, 4);
  70.             acid[4] = 0;
  71.             cid = strtol(acid, NULL, 16);
  72.             st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, cid);
  73.             // our parser completely breaks AAC in Ogg
  74.             if (st->codec->codec_id != AV_CODEC_ID_AAC)
  75.                 st->need_parsing = AVSTREAM_PARSE_FULL;
  76.         }
  77.  
  78.         size        = bytestream2_get_le32(&p);
  79.         size        = FFMIN(size, os->psize);
  80.         time_unit   = bytestream2_get_le64(&p);
  81.         spu         = bytestream2_get_le64(&p);
  82.         bytestream2_skip(&p, 4);    /* default_len */
  83.         bytestream2_skip(&p, 8);    /* buffersize + bits_per_sample */
  84.  
  85.         if(st->codec->codec_type == AVMEDIA_TYPE_VIDEO){
  86.             st->codec->width = bytestream2_get_le32(&p);
  87.             st->codec->height = bytestream2_get_le32(&p);
  88.             avpriv_set_pts_info(st, 64, time_unit, spu * 10000000);
  89.         } else {
  90.             st->codec->channels = bytestream2_get_le16(&p);
  91.             bytestream2_skip(&p, 2); /* block_align */
  92.             st->codec->bit_rate = bytestream2_get_le32(&p) * 8;
  93.             st->codec->sample_rate = time_unit ? spu * 10000000 / time_unit : 0;
  94.             avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  95.             if (size >= 56 && st->codec->codec_id == AV_CODEC_ID_AAC) {
  96.                 bytestream2_skip(&p, 4);
  97.                 size -= 4;
  98.             }
  99.             if (size > 52) {
  100.                 av_assert0(FF_INPUT_BUFFER_PADDING_SIZE <= 52);
  101.                 size -= 52;
  102.                 ff_alloc_extradata(st->codec, size);
  103.                 bytestream2_get_buffer(&p, st->codec->extradata, st->codec->extradata_size);
  104.             }
  105.         }
  106.     } else if (bytestream2_peek_byte(&p) == 3) {
  107.         bytestream2_skip(&p, 7);
  108.         if (bytestream2_get_bytes_left(&p) > 1)
  109.             ff_vorbis_comment(s, &st->metadata, p.buffer, bytestream2_get_bytes_left(&p) - 1);
  110.     }
  111.  
  112.     return 1;
  113. }
  114.  
  115. static int
  116. ogm_dshow_header(AVFormatContext *s, int idx)
  117. {
  118.     struct ogg *ogg = s->priv_data;
  119.     struct ogg_stream *os = ogg->streams + idx;
  120.     AVStream *st = s->streams[idx];
  121.     uint8_t *p = os->buf + os->pstart;
  122.     uint32_t t;
  123.  
  124.     if(!(*p & 1))
  125.         return 0;
  126.     if(*p != 1)
  127.         return 1;
  128.  
  129.     t = AV_RL32(p + 96);
  130.  
  131.     if(t == 0x05589f80){
  132.         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  133.         st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(p + 68));
  134.         avpriv_set_pts_info(st, 64, AV_RL64(p + 164), 10000000);
  135.         st->codec->width = AV_RL32(p + 176);
  136.         st->codec->height = AV_RL32(p + 180);
  137.     } else if(t == 0x05589f81){
  138.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  139.         st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, AV_RL16(p + 124));
  140.         st->codec->channels = AV_RL16(p + 126);
  141.         st->codec->sample_rate = AV_RL32(p + 128);
  142.         st->codec->bit_rate = AV_RL32(p + 132) * 8;
  143.     }
  144.  
  145.     return 1;
  146. }
  147.  
  148. static int
  149. ogm_packet(AVFormatContext *s, int idx)
  150. {
  151.     struct ogg *ogg = s->priv_data;
  152.     struct ogg_stream *os = ogg->streams + idx;
  153.     uint8_t *p = os->buf + os->pstart;
  154.     int lb;
  155.  
  156.     if(*p & 8)
  157.         os->pflags |= AV_PKT_FLAG_KEY;
  158.  
  159.     lb = ((*p & 2) << 1) | ((*p >> 6) & 3);
  160.     os->pstart += lb + 1;
  161.     os->psize -= lb + 1;
  162.  
  163.     while (lb--)
  164.         os->pduration += p[lb+1] << (lb*8);
  165.  
  166.     return 0;
  167. }
  168.  
  169. const struct ogg_codec ff_ogm_video_codec = {
  170.     .magic = "\001video",
  171.     .magicsize = 6,
  172.     .header = ogm_header,
  173.     .packet = ogm_packet,
  174.     .granule_is_start = 1,
  175.     .nb_header = 2,
  176. };
  177.  
  178. const struct ogg_codec ff_ogm_audio_codec = {
  179.     .magic = "\001audio",
  180.     .magicsize = 6,
  181.     .header = ogm_header,
  182.     .packet = ogm_packet,
  183.     .granule_is_start = 1,
  184.     .nb_header = 2,
  185. };
  186.  
  187. const struct ogg_codec ff_ogm_text_codec = {
  188.     .magic = "\001text",
  189.     .magicsize = 5,
  190.     .header = ogm_header,
  191.     .packet = ogm_packet,
  192.     .granule_is_start = 1,
  193.     .nb_header = 2,
  194. };
  195.  
  196. const struct ogg_codec ff_ogm_old_codec = {
  197.     .magic = "\001Direct Show Samples embedded in Ogg",
  198.     .magicsize = 35,
  199.     .header = ogm_dshow_header,
  200.     .packet = ogm_packet,
  201.     .granule_is_start = 1,
  202.     .nb_header = 1,
  203. };
  204.