PeerStreamer

/*

 * AAC ADTS header decoding prototypes and structures

 * Copyright (c) 2003 Fabrice Bellard

 * Copyright (c) 2003 Michael Niedermayer

 *

 * 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_AACADTSDEC_H

#define AVCODEC_AACADTSDEC_H

#include <stdint.h>

#include "get_bits.h"

#define AAC_ADTS_HEADER_SIZE 7

typedef struct {

    uint32_t sample_rate;

    uint32_t samples;

    uint32_t bit_rate;

    uint8_t  crc_absent;

    uint8_t  object_type;

    uint8_t  sampling_index;

    uint8_t  chan_config;

    uint8_t  num_aac_frames;

} AACADTSHeaderInfo;

/**

 * Parse AAC frame header.

 * Parse the ADTS frame header to the end of the variable header, which is

 * the first 54 bits.

 * @param gbc BitContext containing the first 54 bits of the frame.

 * @param hdr Pointer to struct where header info is written.

 * @return Returns 0 on success, -1 if there is a sync word mismatch,

 * -2 if the version element is invalid, -3 if the sample rate

 * element is invalid, or -4 if the bit rate element is invalid.

 */

int ff_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr);

#endif /* AVCODEC_AACADTSDEC_H */