aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* 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 */
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