FFmpeg  2.1.1
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 };
const char * s
Definition: avisynth_c.h:668
int size
struct ogg_codec ff_ogm_audio_codec
Definition: oggparseogm.c:178
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård.
Definition: oggdec.h:31
unsigned int pflags
Definition: oggdec.h:67
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2556
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:3922
#define AV_RL16(x)
Definition: intreadwrite.h:245
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:686
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:131
static int ogm_header(AVFormatContext *s, int idx)
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård.
Definition: oggparseogm.c:36
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1254
static int ogm_dshow_header(AVFormatContext *s, int idx)
Definition: oggparseogm.c:116
AVDictionary * metadata
Definition: avformat.h:735
Format I/O context.
Definition: avformat.h:968
unsigned int psize
Definition: oggdec.h:66
uint8_t
enum AVStreamParseType need_parsing
Definition: avformat.h:812
struct ogg_codec ff_ogm_video_codec
Definition: oggparseogm.c:169
const uint8_t * buffer
Definition: bytestream.h:34
uint32_t tag
Definition: movenc.c:961
bitstream reader API header.
int ff_vorbis_comment(AVFormatContext *ms, AVDictionary **m, const uint8_t *buf, int size)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1113
void * priv_data
Format private data.
Definition: avformat.h:988
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:162
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:261
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:152
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:358
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:580
int bit_rate
the average bitrate
Definition: avcodec.h:1204
struct ogg_codec ff_ogm_text_codec
Definition: oggparseogm.c:187
full parsing and repack
Definition: avformat.h:599
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:32
int width
picture width / height.
Definition: avcodec.h:1314
unsigned int pstart
Definition: oggdec.h:65
AVStream ** streams
Definition: avformat.h:1016
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
struct ogg_stream * streams
Definition: oggdec.h:100
#define FFMIN(a, b)
Definition: avcodec.h:925
Stream structure.
Definition: avformat.h:667
enum AVMediaType codec_type
Definition: avcodec.h:1154
unsigned int pduration
Definition: oggdec.h:68
enum AVCodecID codec_id
Definition: avcodec.h:1157
int sample_rate
samples per second
Definition: avcodec.h:1873
static int ogm_packet(AVFormatContext *s, int idx)
Definition: oggparseogm.c:149
unsigned int codec_tag
fourcc (LSB first, so &quot;ABCD&quot; -&gt; (&#39;D&#39;&lt;&lt;24) + (&#39;C&#39;&lt;&lt;16) + (&#39;B&#39;&lt;&lt;8) + &#39;A&#39;).
Definition: avcodec.h:1172
int ff_alloc_extradata(AVCodecContext *avctx, int size)
Allocate extradata with additional FF_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:2690
int extradata_size
Definition: avcodec.h:1255
const int8_t * magic
Definition: oggdec.h:32
#define AV_RL64(x)
Definition: intreadwrite.h:317
uint8_t * buf
Definition: oggdec.h:62
static float t
Definition: muxing.c:123
raw UTF-8 text
Definition: avcodec.h:477
struct ogg_codec ff_ogm_old_codec
Definition: oggparseogm.c:196
Main libavformat public API header.
Definition: oggdec.h:99
#define AV_RL32(x)
Definition: intreadwrite.h:275
int channels
number of audio channels
Definition: avcodec.h:1874
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37