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Diffstat (limited to 'libavcodec/codec2utils.h')
-rw-r--r-- | libavcodec/codec2utils.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/libavcodec/codec2utils.h b/libavcodec/codec2utils.h new file mode 100644 index 0000000..6def4d4 --- /dev/null +++ b/libavcodec/codec2utils.h @@ -0,0 +1,82 @@ +/* + * codec2 utility functions + * Copyright (c) 2017 Tomas Härdin + * + * 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 + */ + +#ifndef AVCODEC_CODEC2UTILS_H +#define AVCODEC_CODEC2UTILS_H + +#include <stdint.h> + +//Highest mode we're willing to use. +//Don't want to let users accidentally produce files that can't be decoded in the future. +//CODEC2_MODE_WB (9) is experimental/unstable as of 2017-11-23. +#define AVPRIV_CODEC2_MODE_MAX 8 //CODEC2_MODE_700C + +//Used by both codec2raw demuxer and libcodec2 encoder. +//The integers match the values in codec2.h, so "3200" -> CODEC2_MODE_3000 = 0 and so on. +//It is possible that we're linked to a version of libcodec2 that lacks some of these modes. +//For example Debian stretch ships with libcodec2.so.0.4 which lacks CODEC2_MODE_700C. +#define AVPRIV_CODEC2_AVOPTIONS(desc, classname, min_val, default_val, option_flags) \ + { "mode", desc, offsetof(classname, mode), AV_OPT_TYPE_INT, {.i64 = default_val}, min_val, AVPRIV_CODEC2_MODE_MAX, .flags=option_flags, .unit="codec2_mode"},\ + { "3200", "3200", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, .flags=option_flags, .unit="codec2_mode"},\ + { "2400", "2400", 0, AV_OPT_TYPE_CONST, {.i64 = 1}, .flags=option_flags, .unit="codec2_mode"},\ + { "1600", "1600", 0, AV_OPT_TYPE_CONST, {.i64 = 2}, .flags=option_flags, .unit="codec2_mode"},\ + { "1400", "1400", 0, AV_OPT_TYPE_CONST, {.i64 = 3}, .flags=option_flags, .unit="codec2_mode"},\ + { "1300", "1300", 0, AV_OPT_TYPE_CONST, {.i64 = 4}, .flags=option_flags, .unit="codec2_mode"},\ + { "1200", "1200", 0, AV_OPT_TYPE_CONST, {.i64 = 5}, .flags=option_flags, .unit="codec2_mode"},\ + { "700", "700", 0, AV_OPT_TYPE_CONST, {.i64 = 6}, .flags=option_flags, .unit="codec2_mode"},\ + { "700B", "700B", 0, AV_OPT_TYPE_CONST, {.i64 = 7}, .flags=option_flags, .unit="codec2_mode"},\ + { "700C", "700C", 0, AV_OPT_TYPE_CONST, {.i64 = 8}, .flags=option_flags, .unit="codec2_mode"} + +//The three following functions are here to avoid needing libavformat/codec2.c to depend on libcodec2 + +//Computes bitrate from mode, with frames rounded up to the nearest octet. +//So 700 bit/s (28 bits/frame) becomes 800 bits/s (32 bits/frame). +//logctx is used for av_log() +//Returns <0 if mode is invalid +int avpriv_codec2_mode_bit_rate(void *logctx, int mode); + +//Mimics codec2_samples_per_frame() +int avpriv_codec2_mode_frame_size(void *logctx, int mode); + +//Mimics (codec2_bits_per_frame()+7)/8 +int avpriv_codec2_mode_block_align(void *logctx, int mode); + +#define AVPRIV_CODEC2_EXTRADATA_SIZE 4 + +//Used in codec2raw demuxer and libcodec2 encoder +static inline void avpriv_codec2_make_extradata(uint8_t *ptr, int mode) { + //version 0.8 as of 2017-12-23 (r3386) + ptr[0] = 0; //major + ptr[1] = 8; //minor + ptr[2] = mode; //mode + ptr[3] = 0; //flags +} + +//Returns version as a 16-bit value. 0.8 -> 0x0008 +static inline uint16_t avpriv_codec2_version_from_extradata(uint8_t *ptr) { + return (ptr[0] << 8) + ptr[1]; +} + +static inline uint8_t avpriv_codec2_mode_from_extradata(uint8_t *ptr) { + return ptr[2]; +} + +#endif /* AVCODEC_CODEC2UTILS_H */ |