#include <stdint.h>
#include "libavutil/common.h"
#include "libavutil/libm.h"
#include "libavutil/samplefmt.h"
#include "avresample.h"
#include "internal.h"
#include "audio_data.h"
#include "audio_mix.h"

Data Structures
struct	AudioMix

Macros
#define	MIX_FUNC_NAME(fmt, cfmt) mix_any_ ## fmt ##_## cfmt ##_c

#define	MIX_FUNC_GENERIC(fmt, cfmt, stype, ctype, sumtype, expr)

#define	GET_MATRIX_CONVERT(suffix, scale)

#define	CONVERT_MATRIX(type, expr)

Functions
void	ff_audio_mix_set_func (AudioMix am, enum AVSampleFormat fmt, enum AVMixCoeffType coeff_type, int in_channels, int out_channels, int ptr_align, int samples_align, const char descr, void *mix_func)
	Set mixing function if the parameters match.

	MIX_FUNC_GENERIC (S16P, FLT, int16_t, float, float, av_clip_int16(lrintf(sum)))

static void	mix_2_to_1_s16p_flt_c (int16_t samples, float matrix, int len, int out_ch, int in_ch)

static void	mix_2_to_1_s16p_q8_c (int16_t samples, int16_t matrix, int len, int out_ch, int in_ch)

static void	mix_1_to_2_fltp_flt_c (float samples, float matrix, int len, int out_ch, int in_ch)

static void	mix_6_to_2_fltp_flt_c (float samples, float matrix, int len, int out_ch, int in_ch)

static void	mix_2_to_6_fltp_flt_c (float samples, float matrix, int len, int out_ch, int in_ch)

static int	mix_function_init (AudioMix *am)

AudioMix *	ff_audio_mix_alloc (AVAudioResampleContext *avr)
	Allocate and initialize an AudioMix context.

void	ff_audio_mix_free (AudioMix **am_p)
	Free an AudioMix context.

int	ff_audio_mix (AudioMix am, AudioData src)
	Apply channel mixing to audio data using the current mixing matrix.

int	ff_audio_mix_get_matrix (AudioMix am, double matrix, int stride)
	Get the current mixing matrix.

int	ff_audio_mix_set_matrix (AudioMix am, const double matrix, int stride)
	Set the current mixing matrix.

Variables
static const char *	coeff_type_names [] = { "q8", "q15", "flt" }

Macro Definition Documentation

#define MIX_FUNC_NAME	(	fmt,
		cfmt
	)	mix_any_ ## fmt ##_## cfmt ##_c

Definition at line 93 of file audio_mix.c.

Referenced by mix_function_init().

#define MIX_FUNC_GENERIC	(	fmt,
		cfmt,
		stype,
		ctype,
		sumtype,
		expr
	)

Value:

static void MIX_FUNC_NAME(fmt, cfmt)(stype **samples, ctype **matrix,       \
                                     int len, int out_ch, int in_ch)        \
{                                                                           \
    int i, in, out;                                                         \
    stype temp[AVRESAMPLE_MAX_CHANNELS];                                    \
    for (i = 0; i < len; i++) {                                             \
        for (out = 0; out < out_ch; out++) {                                \
            sumtype sum = 0;                                                \
            for (in = 0; in < in_ch; in++)                                  \
                sum += samples[in][i] * matrix[out][in];                    \
            temp[out] = expr;                                               \
        }                                                                   \
        for (out = 0; out < out_ch; out++)                                  \
            samples[out][i] = temp[out];                                    \
    }                                                                       \
}

Definition at line 95 of file audio_mix.c.

#define GET_MATRIX_CONVERT	(	suffix,
		scale
	)

Value:

if (!am->matrix_ ## suffix[0]) {                                        \
        av_log(am->avr, AV_LOG_ERROR, "matrix is not set\n");               \
        return AVERROR(EINVAL);                                             \
    }                                                                       \
    for (o = 0; o < am->out_channels; o++)                                  \
        for (i = 0; i < am->in_channels; i++)                               \
            matrix[o * stride + i] = am->matrix_ ## suffix[o][i] * (scale);

Referenced by ff_audio_mix_get_matrix().

#define CONVERT_MATRIX	(	type,
		expr
	)

Value:

am->matrix_## type[0] = av_mallocz(am->out_channels * am->in_channels * \
                                       sizeof(*am->matrix_## type[0]));     \
    if (!am->matrix_## type[0])                                             \
        return AVERROR(ENOMEM);                                             \
    for (o = 0; o < am->out_channels; o++) {                                \
        if (o > 0)                                                          \
            am->matrix_## type[o] = am->matrix_## type[o - 1] +             \
                                    am->in_channels;                        \
        for (i = 0; i < am->in_channels; i++) {                             \
            double v = matrix[o * stride + i];                              \
            am->matrix_## type[o][i] = expr;                                \
        }                                                                   \
    }                                                                       \
    am->matrix = (void **)am->matrix_## type;

Referenced by ff_audio_mix_set_matrix().

Function Documentation

void ff_audio_mix_set_func	(	AudioMix *	am,
		enum AVSampleFormat	fmt,
		enum AVMixCoeffType	coeff_type,
		int	in_channels,
		int	out_channels,
		int	ptr_align,
		int	samples_align,
		const char *	descr,
		void *	mix_func
	)

Set mixing function if the parameters match.

This compares the parameters of the mixing function to the parameters in the AudioMix context. If the parameters do not match, no changes are made to the active functions. If the parameters do match and the alignment is not constrained, the function is set as the generic mixing function. If the parameters match and the alignment is constrained, the function is set as the optimized mixing function.

Parameters

am	AudioMix context
fmt	input/output sample format
coeff_type	mixing coefficient type
in_channels	number of input channels, or 0 for any number of channels
out_channels	number of output channels, or 0 for any number of channels
ptr_align	buffer pointer alignment, in bytes
samples_align	buffer size alignment, in samples
descr	function type description (e.g. "C" or "SSE")
mix_func	mixing function pointer

Definition at line 56 of file audio_mix.c.

Referenced by ff_audio_mix_init_x86(), and mix_function_init().

MIX_FUNC_GENERIC	(	S16P	,
		FLT	,
		int16_t	,
		float	,
		float	,
		av_clip_int16(lrintf(sum))
	)

Definition at line 114 of file audio_mix.c.

static void mix_2_to_1_s16p_flt_c	(	int16_t **	samples,
		float **	matrix,
		int	len,
		int	out_ch,
		int	in_ch
	)

static

Definition at line 142 of file audio_mix.c.

Referenced by mix_function_init().

static void mix_2_to_1_s16p_q8_c	(	int16_t **	samples,
		int16_t **	matrix,
		int	len,
		int	out_ch,
		int	in_ch
	)

static

Definition at line 164 of file audio_mix.c.

Referenced by mix_function_init().

static void mix_1_to_2_fltp_flt_c	(	float **	samples,
		float **	matrix,
		int	len,
		int	out_ch,
		int	in_ch
	)

static

Definition at line 186 of file audio_mix.c.

Referenced by mix_function_init().

static void mix_6_to_2_fltp_flt_c	(	float **	samples,
		float **	matrix,
		int	len,
		int	out_ch,
		int	in_ch
	)

static

Definition at line 219 of file audio_mix.c.

Referenced by mix_function_init().

static void mix_2_to_6_fltp_flt_c	(	float **	samples,
		float **	matrix,
		int	len,
		int	out_ch,
		int	in_ch
	)

static

Definition at line 253 of file audio_mix.c.

Referenced by mix_function_init().

static int mix_function_init ( AudioMix * am )

static

Definition at line 279 of file audio_mix.c.

Referenced by ff_audio_mix_set_matrix().

AudioMix* ff_audio_mix_alloc ( AVAudioResampleContext * avr )

Allocate and initialize an AudioMix context.

The parameters in the AVAudioResampleContext are used to initialize the AudioMix context.

Parameters

avr	AVAudioResampleContext

Returns: newly-allocated AudioMix context.

Definition at line 328 of file audio_mix.c.

Referenced by avresample_open().

void ff_audio_mix_free ( AudioMix ** am_p )

Free an AudioMix context.

Definition at line 411 of file audio_mix.c.

Referenced by avresample_close().

int ff_audio_mix	(	AudioMix *	am,
		AudioData *	src
	)

Apply channel mixing to audio data using the current mixing matrix.

Definition at line 430 of file audio_mix.c.

Referenced by avresample_convert().

int ff_audio_mix_get_matrix	(	AudioMix *	am,
		double *	matrix,
		int	stride
	)

Get the current mixing matrix.

Definition at line 460 of file audio_mix.c.

Referenced by avresample_get_matrix().

int ff_audio_mix_set_matrix	(	AudioMix *	am,
		const double *	matrix,
		int	stride
	)

Set the current mixing matrix.

Definition at line 497 of file audio_mix.c.

Referenced by avresample_set_matrix(), and ff_audio_mix_alloc().

Variable Documentation

const char* coeff_type_names[] = { "q8", "q15", "flt" }

static

Definition at line 31 of file audio_mix.c.

Referenced by ff_audio_mix_set_func(), and mix_function_init().

Data Structures

Macros

Functions

Variables

Macro Definition Documentation

Function Documentation

Variable Documentation