FFmpeg  1.2.12
oggparseogm.c
Go to the documentation of this file.
1 
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 };