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65 lines
2.5 KiB
65 lines
2.5 KiB
/* |
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* AAC ADTS header decoding prototypes and structures |
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* Copyright (c) 2003 Fabrice Bellard |
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* Copyright (c) 2003 Michael Niedermayer |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVCODEC_ADTS_HEADER_H |
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#define AVCODEC_ADTS_HEADER_H |
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#include "get_bits.h" |
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typedef struct AACADTSHeaderInfo { |
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uint32_t sample_rate; |
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uint32_t samples; |
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uint32_t bit_rate; |
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uint8_t crc_absent; |
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uint8_t object_type; |
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uint8_t sampling_index; |
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uint8_t chan_config; |
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uint8_t num_aac_frames; |
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uint32_t frame_length; |
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} AACADTSHeaderInfo; |
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/** |
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* Parse the ADTS frame header to the end of the variable header, which is |
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* the first 54 bits. |
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* @param[in] gbc BitContext containing the first 54 bits of the frame. |
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* @param[out] hdr Pointer to struct where header info is written. |
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* @return Returns 0 on success, -1 if there is a sync word mismatch, |
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* -2 if the version element is invalid, -3 if the sample rate |
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* element is invalid, or -4 if the bit rate element is invalid. |
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*/ |
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int ff_adts_header_parse(GetBitContext *gbc, AACADTSHeaderInfo *hdr); |
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/** |
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* Parse the ADTS frame header contained in the buffer, which is |
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* the first 54 bits. |
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* @param[in] buf Pointer to buffer containing the first 54 bits of the frame. |
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* @param[in] size Size of buffer containing the first 54 bits of the frame. |
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* @param[out] phdr Pointer to pointer to struct AACADTSHeaderInfo for which |
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* memory is allocated and header info is written into it. After using the header |
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* information, the allocated memory must be freed by using av_free. |
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* @return Returns 0 on success, -1 if there is a sync word mismatch, |
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* -2 if the version element is invalid, -3 if the sample rate |
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* element is invalid, or -4 if the bit rate element is invalid. |
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*/ |
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int avpriv_adts_header_parse(AACADTSHeaderInfo **phdr, const uint8_t *buf, size_t size); |
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#endif /* AVCODEC_ADTS_HEADER_H */
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