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83 lines
3.7 KiB
C
83 lines
3.7 KiB
C
/*
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* codec2 utility functions
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* Copyright (c) 2017 Tomas Härdin
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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_CODEC2UTILS_H
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#define AVCODEC_CODEC2UTILS_H
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#include <stdint.h>
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//Highest mode we're willing to use.
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//Don't want to let users accidentally produce files that can't be decoded in the future.
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//CODEC2_MODE_WB (9) is experimental/unstable as of 2017-11-23.
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#define AVPRIV_CODEC2_MODE_MAX 8 //CODEC2_MODE_700C
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//Used by both codec2raw demuxer and libcodec2 encoder.
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//The integers match the values in codec2.h, so "3200" -> CODEC2_MODE_3000 = 0 and so on.
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//It is possible that we're linked to a version of libcodec2 that lacks some of these modes.
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//For example Debian stretch ships with libcodec2.so.0.4 which lacks CODEC2_MODE_700C.
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#define AVPRIV_CODEC2_AVOPTIONS(desc, classname, min_val, default_val, option_flags) \
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{ "mode", desc, offsetof(classname, mode), AV_OPT_TYPE_INT, {.i64 = default_val}, min_val, AVPRIV_CODEC2_MODE_MAX, .flags=option_flags, .unit="codec2_mode"},\
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{ "3200", "3200", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, .flags=option_flags, .unit="codec2_mode"},\
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{ "2400", "2400", 0, AV_OPT_TYPE_CONST, {.i64 = 1}, .flags=option_flags, .unit="codec2_mode"},\
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{ "1600", "1600", 0, AV_OPT_TYPE_CONST, {.i64 = 2}, .flags=option_flags, .unit="codec2_mode"},\
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{ "1400", "1400", 0, AV_OPT_TYPE_CONST, {.i64 = 3}, .flags=option_flags, .unit="codec2_mode"},\
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{ "1300", "1300", 0, AV_OPT_TYPE_CONST, {.i64 = 4}, .flags=option_flags, .unit="codec2_mode"},\
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{ "1200", "1200", 0, AV_OPT_TYPE_CONST, {.i64 = 5}, .flags=option_flags, .unit="codec2_mode"},\
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{ "700", "700", 0, AV_OPT_TYPE_CONST, {.i64 = 6}, .flags=option_flags, .unit="codec2_mode"},\
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{ "700B", "700B", 0, AV_OPT_TYPE_CONST, {.i64 = 7}, .flags=option_flags, .unit="codec2_mode"},\
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{ "700C", "700C", 0, AV_OPT_TYPE_CONST, {.i64 = 8}, .flags=option_flags, .unit="codec2_mode"}
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//The three following functions are here to avoid needing libavformat/codec2.c to depend on libcodec2
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//Computes bitrate from mode, with frames rounded up to the nearest octet.
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//So 700 bit/s (28 bits/frame) becomes 800 bits/s (32 bits/frame).
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//logctx is used for av_log()
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//Returns <0 if mode is invalid
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int avpriv_codec2_mode_bit_rate(void *logctx, int mode);
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//Mimics codec2_samples_per_frame()
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int avpriv_codec2_mode_frame_size(void *logctx, int mode);
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//Mimics (codec2_bits_per_frame()+7)/8
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int avpriv_codec2_mode_block_align(void *logctx, int mode);
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#define AVPRIV_CODEC2_EXTRADATA_SIZE 4
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//Used in codec2raw demuxer and libcodec2 encoder
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static inline void avpriv_codec2_make_extradata(uint8_t *ptr, int mode) {
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//version 0.8 as of 2017-12-23 (r3386)
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ptr[0] = 0; //major
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ptr[1] = 8; //minor
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ptr[2] = mode; //mode
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ptr[3] = 0; //flags
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}
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//Returns version as a 16-bit value. 0.8 -> 0x0008
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static inline uint16_t avpriv_codec2_version_from_extradata(uint8_t *ptr) {
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return (ptr[0] << 8) + ptr[1];
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}
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static inline uint8_t avpriv_codec2_mode_from_extradata(uint8_t *ptr) {
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return ptr[2];
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}
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#endif /* AVCODEC_CODEC2UTILS_H */
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