FFmpeg
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#include <math.h>
#include <stdint.h>
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "libavutil/lfg.h"
#include "libavutil/mem.h"
#include "libavutil/samplefmt.h"
#include "audio_convert.h"
#include "dither.h"
#include "internal.h"
Go to the source code of this file.
Data Structures | |
struct | DitherState |
struct | DitherContext |
Macros | |
#define | MUTE_THRESHOLD_SEC 0.000333 |
#define | S16_SCALE 32753.0f |
#define | LFG_SCALE (1.0f / (2.0f * INT32_MAX)) |
#define | SQRT_1_6 0.40824829046386301723f |
Variables | |
static const float | ns_48_coef_b [4] |
static const float | ns_48_coef_a [4] |
static const float | ns_44_coef_b [4] |
static const float | ns_44_coef_a [4] |
Dithered Audio Sample Quantization
Converts from dbl, flt, or s32 to s16 using dithering.
Definition in file dither.c.
Definition at line 105 of file dither.c.
Referenced by dither_init().
Definition at line 112 of file dither.c.
Referenced by dither_init().
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Definition at line 124 of file dither.c.
Referenced by dither_init(), and ff_convert_dither().
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Definition at line 133 of file dither.c.
Referenced by generate_dither_noise().
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Definition at line 142 of file dither.c.
Referenced by convert_samples(), and ff_dither_alloc().
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Definition at line 172 of file dither.c.
Referenced by convert_samples().
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Definition at line 211 of file dither.c.
Referenced by ff_convert_dither().
int ff_convert_dither | ( | DitherContext * | c, |
AudioData * | dst, | ||
AudioData * | src | ||
) |
Convert audio sample format with dithering.
c | DitherContext |
dst | destination audio data |
src | source audio data |
void ff_dither_free | ( | DitherContext ** | c | ) |
Free a DitherContext.
c | DitherContext |
Definition at line 312 of file dither.c.
Referenced by ff_dither_alloc().
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Definition at line 329 of file dither.c.
Referenced by ff_dither_alloc().
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.
The parameters in the AVAudioResampleContext are used to initialize the DitherContext.
avr | AVAudioResampleContext |
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Definition at line 89 of file dither.c.
Referenced by ff_dither_alloc().
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Definition at line 93 of file dither.c.
Referenced by ff_dither_alloc().
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Definition at line 97 of file dither.c.
Referenced by ff_dither_alloc().
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Definition at line 101 of file dither.c.
Referenced by ff_dither_alloc().