Libav
dither.h
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVRESAMPLE_DITHER_H
22 #define AVRESAMPLE_DITHER_H
23 
24 #include "avresample.h"
25 #include "audio_data.h"
26 
27 typedef struct DitherContext DitherContext;
28 
29 typedef struct DitherDSPContext {
38  void (*quantize)(int16_t *dst, const float *src, float *dither, int len);
39 
40  int ptr_align;
42 
54  void (*dither_int_to_float)(float *dst, int *src0, int len);
56 
67  enum AVSampleFormat out_fmt,
68  enum AVSampleFormat in_fmt,
69  int channels, int sample_rate, int apply_map);
70 
77 
87 
88 /* arch-specific initialization functions */
89 
91  enum AVResampleDitherMethod method);
92 
93 #endif /* AVRESAMPLE_DITHER_H */
Audio buffer used for intermediate storage between conversion phases.
Definition: oss_audio.c:47
DitherContext * ff_dither_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map)
Allocate and initialize a DitherContext.
Definition: dither.c:345
void ff_dither_free(DitherContext **c)
Free a DitherContext.
Definition: dither.c:312
int ptr_align
src and dst constraits for quantize()
Definition: dither.h:40
external API header
int samples_align
len constraits for quantize()
Definition: dither.h:41
static const uint16_t dither[8][8]
Definition: vf_gradfun.c:46
static void(WINAPI *cond_broadcast)(pthread_cond_t *cond)
AVSampleFormat
Audio Sample Formats.
Definition: samplefmt.h:49
int ff_convert_dither(DitherContext *c, AudioData *dst, AudioData *src)
Convert audio sample format with dithering.
Definition: dither.c:242
int len
void(* dither_int_to_float)(float *dst, int *src0, int len)
Convert dither noise from int to float with triangular distribution.
Definition: dither.h:54
void ff_dither_init_x86(DitherDSPContext *ddsp, enum AVResampleDitherMethod method)
Definition: dither_init.c:34
AVResampleDitherMethod
Definition: avresample.h:122
void(* quantize)(int16_t *dst, const float *src, float *dither, int len)
Convert samples from flt to s16 with added dither noise.
Definition: dither.h:38