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/libavformat/oggdec.h

http://github.com/FFmpeg/FFmpeg
C Header | 175 lines | 115 code | 18 blank | 42 comment | 10 complexity | 7162ed44559400d497d1c2da9212797f MD5 | raw file
  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
 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     * Number of expected headers
 56     */
 57    int nb_header;
 58    void (*cleanup)(AVFormatContext *s, int idx);
 59};
 60
 61struct 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    unsigned int new_metadata_size;
 91    void *private;
 92};
 93
 94struct 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
102struct 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
117extern const struct ogg_codec ff_celt_codec;
118extern const struct ogg_codec ff_daala_codec;
119extern const struct ogg_codec ff_dirac_codec;
120extern const struct ogg_codec ff_flac_codec;
121extern const struct ogg_codec ff_ogm_audio_codec;
122extern const struct ogg_codec ff_ogm_old_codec;
123extern const struct ogg_codec ff_ogm_text_codec;
124extern const struct ogg_codec ff_ogm_video_codec;
125extern const struct ogg_codec ff_old_dirac_codec;
126extern const struct ogg_codec ff_old_flac_codec;
127extern const struct ogg_codec ff_opus_codec;
128extern const struct ogg_codec ff_skeleton_codec;
129extern const struct ogg_codec ff_speex_codec;
130extern const struct ogg_codec ff_theora_codec;
131extern const struct ogg_codec ff_vorbis_codec;
132extern const struct ogg_codec ff_vp8_codec;
133
134int ff_vorbis_comment(AVFormatContext *ms, AVDictionary **m,
135                      const uint8_t *buf, int size, int parse_picture);
136
137int ff_vorbis_stream_comment(AVFormatContext *as, AVStream *st,
138                             const uint8_t *buf, int size);
139
140static inline int
141ogg_find_stream (struct ogg * ogg, int serial)
142{
143    int i;
144
145    for (i = 0; i < ogg->nstreams; i++)
146        if (ogg->streams[i].serial == serial)
147            return i;
148
149    return -1;
150}
151
152static inline uint64_t
153ogg_gptopts (AVFormatContext * s, int i, uint64_t gp, int64_t *dts)
154{
155    struct ogg *ogg = s->priv_data;
156    struct ogg_stream *os = ogg->streams + i;
157    uint64_t pts = AV_NOPTS_VALUE;
158
159    if(os->codec && os->codec->gptopts){
160        pts = os->codec->gptopts(s, i, gp, dts);
161    } else {
162        pts = gp;
163        if (dts)
164            *dts = pts;
165    }
166    if (pts > INT64_MAX && pts != AV_NOPTS_VALUE) {
167        // The return type is unsigned, we thus cannot return negative pts
168        av_log(s, AV_LOG_ERROR, "invalid pts %"PRId64"\n", pts);
169        pts = AV_NOPTS_VALUE;
170    }
171
172    return pts;
173}
174
175#endif /* AVFORMAT_OGGDEC_H */