| /* | |
| * 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 | |
| */ | |
| typedef struct AACADTSHeaderInfo { | |
| 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; | |
| uint32_t frame_length; | |
| } AACADTSHeaderInfo; | |
| /** | |
| * 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_adts_header_parse(GetBitContext *gbc, AACADTSHeaderInfo *hdr); | |
| /** | |
| * Parse the ADTS frame header contained in the buffer, which is | |
| * the first 54 bits. | |
| * @param[in] buf Pointer to buffer containing the first 54 bits of the frame. | |
| * @param[in] size Size of buffer containing the first 54 bits of the frame. | |
| * @param[out] phdr Pointer to pointer to struct AACADTSHeaderInfo for which | |
| * memory is allocated and header info is written into it. After using the header | |
| * information, the allocated memory must be freed by using av_free. | |
| * @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 avpriv_adts_header_parse(AACADTSHeaderInfo **phdr, const uint8_t *buf, size_t size); | |