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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];
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;
56  bytestream2_skip(&p, 8);
57  tag = bytestream2_get_le32(&p);
59  st->codec->codec_tag = tag;
60  } else if (bytestream2_peek_byte(&p) == 't') {
63  bytestream2_skip(&p, 12);
64  } else {
65  uint8_t acid[5] = { 0 };
66  int cid;
68  bytestream2_skip(&p, 8);
69  bytestream2_get_buffer(&p, acid, 4);
70  acid[4] = 0;
71  cid = strtol(acid, NULL, 16);
73  // our parser completely breaks AAC in Ogg
74  if (st->codec->codec_id != AV_CODEC_ID_AAC)
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 
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) {
101  size -= 52;
102  ff_alloc_extradata(st->codec, size);
104  }
105  }
106  } else if (bytestream2_peek_byte(&p) == 3) {
107  bytestream2_skip(&p, 7);
108  if (bytestream2_get_bytes_left(&p) > 1)
110  }
111 
112  return 1;
113 }
114 
115 static int
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){
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){
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
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 
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 
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 };