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ffmpeg / libavformat / oggdec.h @ 73823cb9

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/**
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    Copyright (C) 2005  Michael Ahlberg, Måns Rullgård
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    Permission is hereby granted, free of charge, to any person
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    obtaining a copy of this software and associated documentation
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    files (the "Software"), to deal in the Software without
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    restriction, including without limitation the rights to use, copy,
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    modify, merge, publish, distribute, sublicense, and/or sell copies
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    of the Software, and to permit persons to whom the Software is
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    furnished to do so, subject to the following conditions:
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    The above copyright notice and this permission notice shall be
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    included in all copies or substantial portions of the Software.
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    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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    DEALINGS IN THE SOFTWARE.
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**/
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#ifndef AVFORMAT_OGGDEC_H
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#define AVFORMAT_OGGDEC_H
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#include "avformat.h"
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#include "metadata.h"
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struct ogg_codec {
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    const int8_t *magic;
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    uint8_t magicsize;
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    const int8_t *name;
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    /**
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     * Attempt to process a packet as a header
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     * @return 1 if the packet was a valid header,
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     *         0 if the packet was not a header (was a data packet)
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     *         -1 if an error occurred or for unsupported stream
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     */
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    int (*header)(AVFormatContext *, int);
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    int (*packet)(AVFormatContext *, int);
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    /**
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     * Translate a granule into a timestamp.
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     * Will set dts if non-null and known.
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     * @return pts
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     */
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    uint64_t (*gptopts)(AVFormatContext *, int, uint64_t, int64_t *dts);
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    /**
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     * 1 if granule is the start time of the associated packet.
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     * 0 if granule is the end time of the associated packet.
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     */
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    int granule_is_start;
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};
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struct ogg_stream {
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    uint8_t *buf;
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    unsigned int bufsize;
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    unsigned int bufpos;
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    unsigned int pstart;
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    unsigned int psize;
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    unsigned int pflags;
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    unsigned int pduration;
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    uint32_t serial;
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    uint32_t seq;
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    uint64_t granule;
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    int64_t lastpts;
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    int64_t lastdts;
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    int64_t sync_pos;   ///< file offset of the first page needed to reconstruct the current packet
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    int64_t page_pos;   ///< file offset of the current page
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    int flags;
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    const struct ogg_codec *codec;
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    int header;
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    int nsegs, segp;
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    uint8_t segments[255];
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    int incomplete; ///< whether we're expecting a continuation in the next page
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    int page_end;   ///< current packet is the last one completed in the page
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    void *private;
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};
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struct ogg_state {
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    uint64_t pos;
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    int curidx;
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    struct ogg_state *next;
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    int nstreams;
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    struct ogg_stream streams[1];
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};
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struct ogg {
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    struct ogg_stream *streams;
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    int nstreams;
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    int headers;
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    int curidx;
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    uint64_t size;
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    struct ogg_state *state;
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};
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#define OGG_FLAG_CONT 1
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#define OGG_FLAG_BOS  2
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#define OGG_FLAG_EOS  4
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extern const struct ogg_codec ff_dirac_codec;
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extern const struct ogg_codec ff_flac_codec;
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extern const struct ogg_codec ff_ogm_audio_codec;
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extern const struct ogg_codec ff_ogm_old_codec;
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extern const struct ogg_codec ff_ogm_text_codec;
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extern const struct ogg_codec ff_ogm_video_codec;
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extern const struct ogg_codec ff_old_dirac_codec;
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extern const struct ogg_codec ff_old_flac_codec;
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extern const struct ogg_codec ff_speex_codec;
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extern const struct ogg_codec ff_theora_codec;
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extern const struct ogg_codec ff_vorbis_codec;
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extern const AVMetadataConv ff_vorbiscomment_metadata_conv[];
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int vorbis_comment(AVFormatContext *ms, uint8_t *buf, int size);
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#endif /* AVFORMAT_OGGDEC_H */