1 /* 2 * AC-3 parser internal code 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21 #ifndef AVCODEC_AC3_PARSER_INTERNAL_H 22 #define AVCODEC_AC3_PARSER_INTERNAL_H 23 24 #include "ac3.h" 25 #include "get_bits.h" 26 27 /** 28 * Parse AC-3 frame header. 29 * Parse the header up to the lfeon element, which is the first 52 or 54 bits 30 * depending on the audio coding mode. 31 * @param[in] gbc BitContext containing the first 54 bits of the frame. 32 * @param[out] hdr Pointer to struct where header info is written. 33 * @return Returns 0 on success, -1 if there is a sync word mismatch, 34 * -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate) 35 * element is invalid, or -4 if the frmsizecod (bit rate) element is invalid. 36 */ 37 int ff_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr); 38 39 int avpriv_ac3_parse_header(AC3HeaderInfo **hdr, const uint8_t *buf, 40 size_t size); 41 42 #endif /* AVCODEC_AC3_PARSER_INTERNAL_H */ 43