1/* 2 * AAC ADTS header decoding prototypes and structures 3 * Copyright (c) 2003 Fabrice Bellard 4 * Copyright (c) 2003 Michael Niedermayer 5 * 6 * This file is part of Libav. 7 * 8 * Libav 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 * Libav 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 Libav; 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_AACADTSDEC_H 24#define AVCODEC_AACADTSDEC_H 25 26#include <stdint.h> 27#include "get_bits.h" 28 29#define AAC_ADTS_HEADER_SIZE 7 30 31typedef struct { 32 uint32_t sample_rate; 33 uint32_t samples; 34 uint32_t bit_rate; 35 uint8_t crc_absent; 36 uint8_t object_type; 37 uint8_t sampling_index; 38 uint8_t chan_config; 39 uint8_t num_aac_frames; 40} AACADTSHeaderInfo; 41 42/** 43 * Parse AAC frame header. 44 * Parse the ADTS frame header to the end of the variable header, which is 45 * the first 54 bits. 46 * @param[in] gbc BitContext containing the first 54 bits of the frame. 47 * @param[out] hdr Pointer to struct where header info is written. 48 * @return Returns 0 on success, -1 if there is a sync word mismatch, 49 * -2 if the version element is invalid, -3 if the sample rate 50 * element is invalid, or -4 if the bit rate element is invalid. 51 */ 52int avpriv_aac_parse_header(GetBitContext *gbc, AACADTSHeaderInfo *hdr); 53 54#endif /* AVCODEC_AACADTSDEC_H */ 55