chromium/third_party/ffmpeg/libavformat/oggparsevorbis.c

/*
 * Copyright (C) 2005  Michael Ahlberg, Måns Rullgård
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 *  DEALINGS IN THE SOFTWARE.
 */

#include <stdlib.h>

#include "libavutil/avstring.h"
#include "libavutil/base64.h"
#include "libavutil/dict.h"
#include "libavutil/mem.h"

#include "libavcodec/bytestream.h"
#include "libavcodec/vorbis_parser.h"

#include "avformat.h"
#include "demux.h"
#include "flac_picture.h"
#include "internal.h"
#include "oggdec.h"
#include "vorbiscomment.h"
#include "replaygain.h"

static int ogm_chapter(AVFormatContext *as, const uint8_t *key, const uint8_t *val)
{ … }

int ff_vorbis_stream_comment(AVFormatContext *as, AVStream *st,
                             const uint8_t *buf, int size)
{ … }

/**
 * This function temporarily modifies the (const qualified) input buffer
 * and reverts its changes before return. The input buffer needs to have
 * at least one byte of padding.
 */
static int vorbis_parse_single_comment(AVFormatContext *as, AVDictionary **m,
                                       const uint8_t *buf, uint32_t size,
                                       int *updates, int parse_picture)
{ … }

int ff_vorbis_comment(AVFormatContext *as, AVDictionary **m,
                      const uint8_t *buf, int size,
                      int parse_picture)
{ … }

/*
 * Parse the vorbis header
 *
 * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
 * [vorbis_version] = read 32 bits as unsigned integer | Not used
 * [audio_channels] = read 8 bit integer as unsigned | Used
 * [audio_sample_rate] = read 32 bits as unsigned integer | Used
 * [bitrate_maximum] = read 32 bits as signed integer | Not used yet
 * [bitrate_nominal] = read 32 bits as signed integer | Not used yet
 * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
 * [blocksize_0] = read 4 bits as unsigned integer | Not Used
 * [blocksize_1] = read 4 bits as unsigned integer | Not Used
 * [framing_flag] = read one bit | Not Used
 */

struct oggvorbis_private { … };

static int fixup_vorbis_headers(AVFormatContext *as,
                                struct oggvorbis_private *priv,
                                uint8_t **buf)
{ … }

static void vorbis_cleanup(AVFormatContext *s, int idx)
{ … }

static int vorbis_update_metadata(AVFormatContext *s, int idx)
{ … }

static int vorbis_header(AVFormatContext *s, int idx)
{ … }

static int vorbis_packet(AVFormatContext *s, int idx)
{ … }

const struct ogg_codec ff_vorbis_codec = …;