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oggdec.h
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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 #ifndef AVFORMAT_OGGDEC_H
26 #define AVFORMAT_OGGDEC_H
27 
28 #include "avformat.h"
29 #include "metadata.h"
30 
31 struct ogg_codec {
32  const int8_t *magic;
33  uint8_t magicsize;
34  const int8_t *name;
35  /**
36  * Attempt to process a packet as a header
37  * @return 1 if the packet was a valid header,
38  * 0 if the packet was not a header (was a data packet)
39  * -1 if an error occurred or for unsupported stream
40  */
41  int (*header)(AVFormatContext *, int);
42  int (*packet)(AVFormatContext *, int);
43  /**
44  * Translate a granule into a timestamp.
45  * Will set dts if non-null and known.
46  * @return pts
47  */
48  uint64_t (*gptopts)(AVFormatContext *, int, uint64_t, int64_t *dts);
49  /**
50  * 1 if granule is the start time of the associated packet.
51  * 0 if granule is the end time of the associated packet.
52  */
53  int granule_is_start;
54  /**
55  * Number of expected headers
56  */
57  int nb_header;
58  void (*cleanup)(AVFormatContext *s, int idx);
59 };
60 
61 struct ogg_stream {
62  uint8_t *buf;
63  unsigned int bufsize;
64  unsigned int bufpos;
65  unsigned int pstart;
66  unsigned int psize;
67  unsigned int pflags;
68  unsigned int pduration;
69  uint32_t serial;
70  uint64_t granule;
71  uint64_t start_granule;
72  int64_t lastpts;
73  int64_t lastdts;
74  int64_t sync_pos; ///< file offset of the first page needed to reconstruct the current packet
75  int64_t page_pos; ///< file offset of the current page
76  int flags;
77  const struct ogg_codec *codec;
78  int header;
79  int nsegs, segp;
80  uint8_t segments[255];
81  int incomplete; ///< whether we're expecting a continuation in the next page
82  int page_end; ///< current packet is the last one completed in the page
83  int keyframe_seek;
84  int got_start;
85  int got_data; ///< 1 if the stream got some data (non-initial packets), 0 otherwise
86  int nb_header; ///< set to the number of parsed headers
87  int end_trimming; ///< set the number of packets to drop from the end
88  void *private;
89 };
90 
91 struct ogg_state {
92  uint64_t pos;
93  int curidx;
94  struct ogg_state *next;
95  int nstreams;
96  struct ogg_stream streams[1];
97 };
98 
99 struct ogg {
100  struct ogg_stream *streams;
101  int nstreams;
102  int headers;
103  int curidx;
104  int64_t page_pos; ///< file offset of the current page
105  struct ogg_state *state;
106 };
107 
108 #define OGG_FLAG_CONT 1
109 #define OGG_FLAG_BOS 2
110 #define OGG_FLAG_EOS 4
111 
112 #define OGG_NOGRANULE_VALUE (-1ull)
113 
114 extern const struct ogg_codec ff_celt_codec;
115 extern const struct ogg_codec ff_dirac_codec;
116 extern const struct ogg_codec ff_flac_codec;
117 extern const struct ogg_codec ff_ogm_audio_codec;
118 extern const struct ogg_codec ff_ogm_old_codec;
119 extern const struct ogg_codec ff_ogm_text_codec;
120 extern const struct ogg_codec ff_ogm_video_codec;
121 extern const struct ogg_codec ff_old_dirac_codec;
122 extern const struct ogg_codec ff_old_flac_codec;
123 extern const struct ogg_codec ff_opus_codec;
124 extern const struct ogg_codec ff_skeleton_codec;
125 extern const struct ogg_codec ff_speex_codec;
126 extern const struct ogg_codec ff_theora_codec;
127 extern const struct ogg_codec ff_vorbis_codec;
128 
129 int ff_vorbis_comment(AVFormatContext *ms, AVDictionary **m, const uint8_t *buf, int size);
130 
131 static inline int
132 ogg_find_stream (struct ogg * ogg, int serial)
133 {
134  int i;
135 
136  for (i = 0; i < ogg->nstreams; i++)
137  if (ogg->streams[i].serial == serial)
138  return i;
139 
140  return -1;
141 }
142 
143 static inline uint64_t
144 ogg_gptopts (AVFormatContext * s, int i, uint64_t gp, int64_t *dts)
145 {
146  struct ogg *ogg = s->priv_data;
147  struct ogg_stream *os = ogg->streams + i;
148  uint64_t pts = AV_NOPTS_VALUE;
149 
150  if(os->codec && os->codec->gptopts){
151  pts = os->codec->gptopts(s, i, gp, dts);
152  } else {
153  pts = gp;
154  if (dts)
155  *dts = pts;
156  }
157 
158  return pts;
159 }
160 
161 #endif /* AVFORMAT_OGGDEC_H */
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