/* * AAC ADTS header decoding prototypes and structures * Copyright (c) 2003 Fabrice Bellard * Copyright (c) 2003 Michael Niedermayer * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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[in] gbc BitContext containing the first 54 bits of the frame. * @param[out] 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 */