1/* 2 * AAC parser prototypes 3 * Copyright (c) 2003 Fabrice Bellard 4 * Copyright (c) 2003 Michael Niedermayer 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#ifndef AVCODEC_AAC_PARSER_H 24#define AVCODEC_AAC_PARSER_H 25 26#include <stdint.h> 27#include "aac_ac3_parser.h" 28#include "get_bits.h" 29 30#define AAC_ADTS_HEADER_SIZE 7 31 32typedef struct { 33 uint32_t sample_rate; 34 uint32_t samples; 35 uint32_t bit_rate; 36 uint8_t crc_absent; 37 uint8_t object_type; 38 uint8_t sampling_index; 39 uint8_t chan_config; 40 uint8_t num_aac_frames; 41} AACADTSHeaderInfo; 42 43/** 44 * Parses AAC frame header. 45 * Parses the ADTS frame header to the end of the variable header, which is 46 * the first 54 bits. 47 * @param gbc[in] BitContext containing the first 54 bits of the frame. 48 * @param hdr[out] Pointer to struct where header info is written. 49 * @return Returns 0 on success, -1 if there is a sync word mismatch, 50 * -2 if the version element is invalid, -3 if the sample rate 51 * element is invalid, or -4 if the bit rate element is invalid. 52 */ 53int ff_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr); 54 55#endif /* AVCODEC_AAC_PARSER_H */ 56