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oggparseogm.c
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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
37 {
38  struct ogg *ogg = s->priv_data;
39  struct ogg_stream *os = ogg->streams + idx;
40  AVStream *st = s->streams[idx];
41  const uint8_t *p = os->buf + os->pstart;
42  uint64_t time_unit;
43  uint64_t spu;
44  uint32_t size;
45 
46  if(!(*p & 1))
47  return 0;
48 
49  if(*p == 1) {
50  p++;
51 
52  if(*p == 'v'){
53  int tag;
55  p += 8;
56  tag = bytestream_get_le32(&p);
58  st->codec->codec_tag = tag;
59  } else if (*p == 't') {
62  p += 12;
63  } else {
64  uint8_t acid[5];
65  int cid;
67  p += 8;
68  bytestream_get_buffer(&p, acid, 4);
69  acid[4] = 0;
70  cid = strtol(acid, NULL, 16);
72  // our parser completely breaks AAC in Ogg
73  if (st->codec->codec_id != AV_CODEC_ID_AAC)
75  }
76 
77  size = bytestream_get_le32(&p);
78  size = FFMIN(size, os->psize);
79  time_unit = bytestream_get_le64(&p);
80  spu = bytestream_get_le64(&p);
81  p += 4; /* default_len */
82  p += 8; /* buffersize + bits_per_sample */
83 
85  st->codec->width = bytestream_get_le32(&p);
86  st->codec->height = bytestream_get_le32(&p);
87  avpriv_set_pts_info(st, 64, time_unit, spu * 10000000);
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 = time_unit ? spu * 10000000 / time_unit : 0;
93  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
94  if (size >= 56 && st->codec->codec_id == AV_CODEC_ID_AAC) {
95  p += 4;
96  size -= 4;
97  }
98  if (size > 52) {
100  size -= 52;
101  st->codec->extradata_size = size;
103  bytestream_get_buffer(&p, st->codec->extradata, size);
104  }
105  }
106  } else if (*p == 3) {
107  if (os->psize > 8)
108  ff_vorbis_comment(s, &st->metadata, p+7, os->psize-8);
109  }
110 
111  return 1;
112 }
113 
114 static int
116 {
117  struct ogg *ogg = s->priv_data;
118  struct ogg_stream *os = ogg->streams + idx;
119  AVStream *st = s->streams[idx];
120  uint8_t *p = os->buf + os->pstart;
121  uint32_t t;
122 
123  if(!(*p & 1))
124  return 0;
125  if(*p != 1)
126  return 1;
127 
128  t = AV_RL32(p + 96);
129 
130  if(t == 0x05589f80){
133  avpriv_set_pts_info(st, 64, AV_RL64(p + 164), 10000000);
134  st->codec->width = AV_RL32(p + 176);
135  st->codec->height = AV_RL32(p + 180);
136  } else if(t == 0x05589f81){
139  st->codec->channels = AV_RL16(p + 126);
140  st->codec->sample_rate = AV_RL32(p + 128);
141  st->codec->bit_rate = AV_RL32(p + 132) * 8;
142  }
143 
144  return 1;
145 }
146 
147 static int
149 {
150  struct ogg *ogg = s->priv_data;
151  struct ogg_stream *os = ogg->streams + idx;
152  uint8_t *p = os->buf + os->pstart;
153  int lb;
154 
155  if(*p & 8)
156  os->pflags |= AV_PKT_FLAG_KEY;
157 
158  lb = ((*p & 2) << 1) | ((*p >> 6) & 3);
159  os->pstart += lb + 1;
160  os->psize -= lb + 1;
161 
162  while (lb--)
163  os->pduration += p[lb+1] << (lb*8);
164 
165  return 0;
166 }
167 
169  .magic = "\001video",
170  .magicsize = 6,
171  .header = ogm_header,
172  .packet = ogm_packet,
173  .granule_is_start = 1,
174  .nb_header = 2,
175 };
176 
178  .magic = "\001audio",
179  .magicsize = 6,
180  .header = ogm_header,
181  .packet = ogm_packet,
182  .granule_is_start = 1,
183  .nb_header = 2,
184 };
185 
186 const struct ogg_codec ff_ogm_text_codec = {
187  .magic = "\001text",
188  .magicsize = 5,
189  .header = ogm_header,
190  .packet = ogm_packet,
191  .granule_is_start = 1,
192  .nb_header = 2,
193 };
194 
195 const struct ogg_codec ff_ogm_old_codec = {
196  .magic = "\001Direct Show Samples embedded in Ogg",
197  .magicsize = 35,
198  .header = ogm_dshow_header,
199  .packet = ogm_packet,
200  .granule_is_start = 1,
201  .nb_header = 1,
202 };