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 start_trimming; ///< set the number of packets to drop from the start
88 int end_trimming; ///< set the number of packets to drop from the end
89 uint8_t *new_metadata;
90 buffer_size_t new_metadata_size;
91 void *private;
92 };
93
94 struct ogg_state {
95 uint64_t pos;
96 int curidx;
97 struct ogg_state *next;
98 int nstreams;
99 struct ogg_stream streams[1];
100 };
101
102 struct ogg {
103 struct ogg_stream *streams;
104 int nstreams;
105 int headers;
106 int curidx;
107 int64_t page_pos; ///< file offset of the current page
108 struct ogg_state *state;
109 };
110
111 #define OGG_FLAG_CONT 1
112 #define OGG_FLAG_BOS 2
113 #define OGG_FLAG_EOS 4
114
115 #define OGG_NOGRANULE_VALUE (-1ull)
116
117 extern const struct ogg_codec ff_celt_codec;
118 extern const struct ogg_codec ff_dirac_codec;
119 extern const struct ogg_codec ff_flac_codec;
120 extern const struct ogg_codec ff_ogm_audio_codec;
121 extern const struct ogg_codec ff_ogm_old_codec;
122 extern const struct ogg_codec ff_ogm_text_codec;
123 extern const struct ogg_codec ff_ogm_video_codec;
124 extern const struct ogg_codec ff_old_dirac_codec;
125 extern const struct ogg_codec ff_old_flac_codec;
126 extern const struct ogg_codec ff_opus_codec;
127 extern const struct ogg_codec ff_skeleton_codec;
128 extern const struct ogg_codec ff_speex_codec;
129 extern const struct ogg_codec ff_theora_codec;
130 extern const struct ogg_codec ff_vorbis_codec;
131 extern const struct ogg_codec ff_vp8_codec;
132
133 int ff_vorbis_comment(AVFormatContext *ms, AVDictionary **m,
134 const uint8_t *buf, int size, int parse_picture);
135
136 int ff_vorbis_stream_comment(AVFormatContext *as, AVStream *st,
137 const uint8_t *buf, int size);
138
139 static inline int
ogg_find_stream(struct ogg * ogg,int serial)140 ogg_find_stream (struct ogg * ogg, int serial)
141 {
142 int i;
143
144 for (i = 0; i < ogg->nstreams; i++)
145 if (ogg->streams[i].serial == serial)
146 return i;
147
148 return -1;
149 }
150
151 static inline uint64_t
ogg_gptopts(AVFormatContext * s,int i,uint64_t gp,int64_t * dts)152 ogg_gptopts (AVFormatContext * s, int i, uint64_t gp, int64_t *dts)
153 {
154 struct ogg *ogg = s->priv_data;
155 struct ogg_stream *os = ogg->streams + i;
156 uint64_t pts = AV_NOPTS_VALUE;
157
158 if(os->codec && os->codec->gptopts){
159 pts = os->codec->gptopts(s, i, gp, dts);
160 } else {
161 pts = gp;
162 if (dts)
163 *dts = pts;
164 }
165 if (pts > INT64_MAX && pts != AV_NOPTS_VALUE) {
166 // The return type is unsigned, we thus cannot return negative pts
167 av_log(s, AV_LOG_ERROR, "invalid pts %"PRId64"\n", pts);
168 pts = AV_NOPTS_VALUE;
169 }
170
171 return pts;
172 }
173
174 #endif /* AVFORMAT_OGGDEC_H */
175