| /* |
| * Copyright (c) 2012 Justin Ruggles |
| * |
| * 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 |
| */ |
| |
| /** |
| * @file |
| * Vorbis audio parser |
| * |
| * Determines the duration for each packet. |
| */ |
| |
| #ifndef AVCODEC_VORBIS_PARSER_H |
| #define AVCODEC_VORBIS_PARSER_H |
| |
| #include "avcodec.h" |
| #include "vorbis_parser.h" |
| |
| struct AVVorbisParseContext { |
| const AVClass *class; |
| int extradata_parsed; ///< we have attempted to parse extradata |
| int valid_extradata; ///< extradata is valid, so we can calculate duration |
| int blocksize[2]; ///< short and long window sizes |
| int previous_blocksize; ///< previous window size |
| int mode_blocksize[64]; ///< window size mapping for each mode |
| int mode_count; ///< number of modes |
| int mode_mask; ///< bitmask used to get the mode in each packet |
| int prev_mask; ///< bitmask used to get the previous mode flag in each packet |
| }; |
| |
| #if LIBAVCODEC_VERSION_MAJOR < 57 |
| /** |
| * Initialize the Vorbis parser using headers in the extradata. |
| * |
| * @param avctx codec context |
| * @param s Vorbis parser context |
| */ |
| int avpriv_vorbis_parse_extradata(AVCodecContext *avctx, AVVorbisParseContext *s); |
| |
| /** |
| * Get the duration for a Vorbis packet. |
| * |
| * avpriv_vorbis_parse_extradata() must have been successfully called prior to |
| * this in order for a correct duration to be returned. If @p flags is @c NULL, |
| * special frames are considered invalid. |
| * |
| * @param s Vorbis parser context |
| * @param buf buffer containing a Vorbis frame |
| * @param buf_size size of the buffer |
| * @param flags flags for special frames |
| */ |
| int avpriv_vorbis_parse_frame_flags(AVVorbisParseContext *s, const uint8_t *buf, |
| int buf_size, int *flags); |
| |
| /** |
| * Get the duration for a Vorbis packet. |
| * |
| * avpriv_vorbis_parse_extradata() must have been successfully called prior to |
| * this in order for a correct duration to be returned. |
| * |
| * @param s Vorbis parser context |
| * @param buf buffer containing a Vorbis frame |
| * @param buf_size size of the buffer |
| */ |
| int avpriv_vorbis_parse_frame(AVVorbisParseContext *s, const uint8_t *buf, |
| int buf_size); |
| |
| void avpriv_vorbis_parse_reset(AVVorbisParseContext *s); |
| #endif |
| |
| #endif /* AVCODEC_VORBIS_PARSER_H */ |