1/**
2    Copyright (C) 2005  Michael Ahlberg, M��ns Rullg��rd
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
31struct 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
56struct ogg_stream {
57    uint8_t *buf;
58    unsigned int bufsize;
59    unsigned int bufpos;
60    unsigned int pstart;
61    unsigned int psize;
62    unsigned int pflags;
63    unsigned int pduration;
64    uint32_t serial;
65    uint64_t granule;
66    int64_t lastpts;
67    int64_t lastdts;
68    int64_t sync_pos;   ///< file offset of the first page needed to reconstruct the current packet
69    int64_t page_pos;   ///< file offset of the current page
70    int flags;
71    const struct ogg_codec *codec;
72    int header;
73    int nsegs, segp;
74    uint8_t segments[255];
75    int incomplete; ///< whether we're expecting a continuation in the next page
76    int page_end;   ///< current packet is the last one completed in the page
77    int keyframe_seek;
78    void *private;
79};
80
81struct ogg_state {
82    uint64_t pos;
83    int curidx;
84    struct ogg_state *next;
85    int nstreams;
86    struct ogg_stream streams[1];
87};
88
89struct ogg {
90    struct ogg_stream *streams;
91    int nstreams;
92    int headers;
93    int curidx;
94    struct ogg_state *state;
95};
96
97#define OGG_FLAG_CONT 1
98#define OGG_FLAG_BOS  2
99#define OGG_FLAG_EOS  4
100
101extern const struct ogg_codec ff_dirac_codec;
102extern const struct ogg_codec ff_flac_codec;
103extern const struct ogg_codec ff_ogm_audio_codec;
104extern const struct ogg_codec ff_ogm_old_codec;
105extern const struct ogg_codec ff_ogm_text_codec;
106extern const struct ogg_codec ff_ogm_video_codec;
107extern const struct ogg_codec ff_old_dirac_codec;
108extern const struct ogg_codec ff_old_flac_codec;
109extern const struct ogg_codec ff_skeleton_codec;
110extern const struct ogg_codec ff_speex_codec;
111extern const struct ogg_codec ff_theora_codec;
112extern const struct ogg_codec ff_vorbis_codec;
113
114int ff_vorbis_comment(AVFormatContext *ms, AVMetadata **m, const uint8_t *buf, int size);
115
116static inline int
117ogg_find_stream (struct ogg * ogg, int serial)
118{
119    int i;
120
121    for (i = 0; i < ogg->nstreams; i++)
122        if (ogg->streams[i].serial == serial)
123            return i;
124
125    return -1;
126}
127
128static inline uint64_t
129ogg_gptopts (AVFormatContext * s, int i, uint64_t gp, int64_t *dts)
130{
131    struct ogg *ogg = s->priv_data;
132    struct ogg_stream *os = ogg->streams + i;
133    uint64_t pts = AV_NOPTS_VALUE;
134
135    if(os->codec && os->codec->gptopts){
136        pts = os->codec->gptopts(s, i, gp, dts);
137    } else {
138        pts = gp;
139        if (dts)
140            *dts = pts;
141    }
142
143    return pts;
144}
145
146#endif /* AVFORMAT_OGGDEC_H */
147