mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
/*
|
|
* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVRESAMPLE_DITHER_H
|
|
#define AVRESAMPLE_DITHER_H
|
|
|
|
#include "avresample.h"
|
|
#include "audio_data.h"
|
|
|
|
typedef struct DitherContext DitherContext;
|
|
|
|
typedef struct DitherDSPContext {
|
|
/**
|
|
* Convert samples from flt to s16 with added dither noise.
|
|
*
|
|
* @param dst destination float array, range -0.5 to 0.5
|
|
* @param src source int array, range INT_MIN to INT_MAX.
|
|
* @param dither float dither noise array
|
|
* @param len number of samples
|
|
*/
|
|
void (*quantize)(int16_t *dst, const float *src, float *dither, int len);
|
|
|
|
int ptr_align; ///< src and dst constraints for quantize()
|
|
int samples_align; ///< len constraints for quantize()
|
|
|
|
/**
|
|
* Convert dither noise from int to float with triangular distribution.
|
|
*
|
|
* @param dst destination float array, range -0.5 to 0.5
|
|
* constraints: 32-byte aligned
|
|
* @param src0 source int array, range INT_MIN to INT_MAX.
|
|
* the array size is len * 2
|
|
* constraints: 32-byte aligned
|
|
* @param len number of output noise samples
|
|
* constraints: multiple of 16
|
|
*/
|
|
void (*dither_int_to_float)(float *dst, int *src0, int len);
|
|
} DitherDSPContext;
|
|
|
|
/**
|
|
* Allocate and initialize a DitherContext.
|
|
*
|
|
* The parameters in the AVAudioResampleContext are used to initialize the
|
|
* DitherContext.
|
|
*
|
|
* @param avr AVAudioResampleContext
|
|
* @return newly-allocated DitherContext
|
|
*/
|
|
DitherContext *ff_dither_alloc(AVAudioResampleContext *avr,
|
|
enum AVSampleFormat out_fmt,
|
|
enum AVSampleFormat in_fmt,
|
|
int channels, int sample_rate, int apply_map);
|
|
|
|
/**
|
|
* Free a DitherContext.
|
|
*
|
|
* @param c DitherContext
|
|
*/
|
|
void ff_dither_free(DitherContext **c);
|
|
|
|
/**
|
|
* Convert audio sample format with dithering.
|
|
*
|
|
* @param c DitherContext
|
|
* @param dst destination audio data
|
|
* @param src source audio data
|
|
* @return 0 if ok, negative AVERROR code on failure
|
|
*/
|
|
int ff_convert_dither(DitherContext *c, AudioData *dst, AudioData *src);
|
|
|
|
/* arch-specific initialization functions */
|
|
|
|
void ff_dither_init_x86(DitherDSPContext *ddsp,
|
|
enum AVResampleDitherMethod method);
|
|
|
|
#endif /* AVRESAMPLE_DITHER_H */
|