/* * Opus decoder/parser common functions and structures * Copyright (c) 2012 Andrew D'Addesio * Copyright (c) 2013-2014 Mozilla Corporation * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_OPUS_PARSE_H#define AVCODEC_OPUS_PARSE_H #include <stdint.h> #include "libavcodec/avcodec.h"#include "opus.h" typedef struct OpusPacket {    int packet_size;                /**< packet size */    int data_size;                  /**< size of the useful data -- packet size - padding */    int code;                       /**< packet code: specifies the frame layout */    int stereo;                     /**< whether this packet is mono or stereo */    int vbr;                        /**< vbr flag */    int config;                     /**< configuration: tells the audio mode,                                     **                bandwidth, and frame duration */    int frame_count;                /**< frame count */    int frame_offset[OPUS_MAX_FRAMES]; /**< frame offsets */    int frame_size[OPUS_MAX_FRAMES]; /**< frame sizes */    int frame_duration;             /**< frame duration, in samples @ 48kHz */    enum OpusMode mode;             /**< mode */    enum OpusBandwidth bandwidth;   /**< bandwidth */} OpusPacket; // a mapping between an opus stream and an output channeltypedef struct ChannelMap {    int stream_idx;    int channel_idx;     // when a single decoded channel is mapped to multiple output channels, we    // write to the first output directly and copy from it to the others    // this field is set to 1 for those copied output channels    int copy;    // this is the index of the output channel to copy from    int copy_idx;     // this channel is silent    int silence;} ChannelMap; typedef struct OpusParseContext {    int             nb_streams;    int      nb_stereo_streams;     int16_t gain_i;     ChannelMap *channel_maps;} OpusParseContext; int ff_opus_parse_packet(OpusPacket *pkt, const uint8_t *buf, int buf_size,                         int self_delimited); int ff_opus_parse_extradata(AVCodecContext *avctx, OpusParseContext *s); #endif /* AVCODEC_OPUS_PARSE_H */