SwrContext Struct Reference

#include <swresample_internal.h>

Data Fields
const AVClass *	av_class
	AVClass used for AVOption and av_log()
int	log_level_offset
	logging level offset
void *	log_ctx
	parent logging context
enum AVSampleFormat	in_sample_fmt
	input sample format
enum AVSampleFormat	int_sample_fmt
	internal sample format (AV_SAMPLE_FMT_FLTP or AV_SAMPLE_FMT_S16P)
enum AVSampleFormat	out_sample_fmt
	output sample format
int64_t	in_ch_layout
	input channel layout
int64_t	out_ch_layout
	output channel layout
int	in_sample_rate
	input sample rate
int	out_sample_rate
	output sample rate
int	flags
	miscellaneous flags such as SWR_FLAG_RESAMPLE
float	slev
	surround mixing level
float	clev
	center mixing level
float	lfe_mix_level
	LFE mixing level.
float	rematrix_volume
	rematrixing volume coefficient
float	rematrix_maxval
	maximum value for rematrixing output
enum AVMatrixEncoding	matrix_encoding
	matrixed stereo encoding
const int *	channel_map
	channel index (or -1 if muted channel) map
int	used_ch_count
	number of used input channels (mapped channel count if channel_map, otherwise in.ch_count)
enum SwrEngine	engine
struct DitherContext	dither
int	filter_size
	length of each FIR filter in the resampling filterbank relative to the cutoff frequency
int	phase_shift
	log2 of the number of entries in the resampling polyphase filterbank
int	linear_interp
	if 1 then the resampling FIR filter will be linearly interpolated
double	cutoff
	resampling cutoff frequency (swr: 6dB point; soxr: 0dB point).
enum SwrFilterType	filter_type
	swr resampling filter type
int	kaiser_beta
	swr beta value for Kaiser window (only applicable if filter_type == AV_FILTER_TYPE_KAISER)
double	precision
	soxr resampling precision (in bits)
int	cheby
	soxr: if 1 then passband rolloff will be none (Chebyshev) & irrational ratio approximation precision will be higher
float	min_compensation
	swr minimum below which no compensation will happen
float	min_hard_compensation
	swr minimum below which no silence inject / sample drop will happen
float	soft_compensation_duration
	swr duration over which soft compensation is applied
float	max_soft_compensation
	swr maximum soft compensation in seconds over soft_compensation_duration
float	async
	swr simple 1 parameter async, similar to ffmpegs -async
int64_t	firstpts_in_samples
	swr first pts in samples
int	resample_first
	1 if resampling must come first, 0 if rematrixing
int	rematrix
	flag to indicate if rematrixing is needed (basically if input and output layouts mismatch)
int	rematrix_custom
	flag to indicate that a custom matrix has been defined
AudioData	in
	input audio data
AudioData	postin
	post-input audio data: used for rematrix/resample
AudioData	midbuf
	intermediate audio data (postin/preout)
AudioData	preout
	pre-output audio data: used for rematrix/resample
AudioData	out
	converted output audio data
AudioData	in_buffer
	cached audio data (convert and resample purpose)
AudioData	silence
	temporary with silence
AudioData	drop_temp
	temporary used to discard output
int	in_buffer_index
	cached buffer position
int	in_buffer_count
	cached buffer length
int	resample_in_constraint
	1 if the input end was reach before the output end, 0 otherwise
int	flushed
	1 if data is to be flushed and no further input is expected
int64_t	outpts
	output PTS
int64_t	firstpts
	first PTS
int	drop_output
	number of output samples to drop
struct AudioConvert *	in_convert
	input conversion context
struct AudioConvert *	out_convert
	output conversion context
struct AudioConvert *	full_convert
	full conversion context (single conversion for input and output)
struct ResampleContext *	resample
	resampling context
struct Resampler const *	resampler
	resampler virtual function table
float	matrix [SWR_CH_MAX][SWR_CH_MAX]
	floating point rematrixing coefficients
uint8_t *	native_matrix
uint8_t *	native_one
uint8_t *	native_simd_one
uint8_t *	native_simd_matrix
int32_t	matrix32 [SWR_CH_MAX][SWR_CH_MAX]
	17.15 fixed point rematrixing coefficients
uint8_t	matrix_ch [SWR_CH_MAX][SWR_CH_MAX+1]
	Lists of input channels per output channel that have non zero rematrixing coefficients.
mix_1_1_func_type *	mix_1_1_f
mix_1_1_func_type *	mix_1_1_simd
mix_2_1_func_type *	mix_2_1_f
mix_2_1_func_type *	mix_2_1_simd
mix_any_func_type *	mix_any_f

Detailed Description

Examples:

doc/examples/muxing.c, and doc/examples/resampling_audio.c.

Definition at line 69 of file swresample_internal.h.

Field Documentation

const AVClass* SwrContext::av_class

AVClass used for AVOption and av_log()

Definition at line 70 of file swresample_internal.h.

Referenced by swr_alloc().

int SwrContext::log_level_offset

logging level offset

Definition at line 71 of file swresample_internal.h.

Referenced by swr_alloc_set_opts().

void* SwrContext::log_ctx

parent logging context

Definition at line 72 of file swresample_internal.h.

Referenced by swr_alloc_set_opts().

enum AVSampleFormat SwrContext::in_sample_fmt

input sample format

Definition at line 73 of file swresample_internal.h.

Referenced by main(), and swr_init().

enum AVSampleFormat SwrContext::int_sample_fmt

internal sample format (AV_SAMPLE_FMT_FLTP or AV_SAMPLE_FMT_S16P)

Definition at line 74 of file swresample_internal.h.

Referenced by auto_matrix(), swr_convert_internal(), swr_init(), and swri_rematrix().

enum AVSampleFormat SwrContext::out_sample_fmt

output sample format

Definition at line 75 of file swresample_internal.h.

Referenced by auto_matrix(), swr_convert_internal(), and swr_init().

int64_t SwrContext::in_ch_layout

input channel layout

Definition at line 76 of file swresample_internal.h.

Referenced by auto_matrix(), swr_init(), swr_set_matrix(), and swri_rematrix_init().

int64_t SwrContext::out_ch_layout

output channel layout

Definition at line 77 of file swresample_internal.h.

Referenced by auto_matrix(), swr_alloc_set_opts(), swr_init(), swr_set_matrix(), swri_rematrix(), and swri_rematrix_init().

int SwrContext::in_sample_rate

input sample rate

Definition at line 78 of file swresample_internal.h.

Referenced by get_delay(), swr_convert(), swr_get_delay(), swr_init(), and swr_next_pts().

int SwrContext::out_sample_rate

output sample rate

Definition at line 79 of file swresample_internal.h.

Referenced by get_delay(), swr_init(), swr_next_pts(), and swri_dither_init().

int SwrContext::flags

miscellaneous flags such as SWR_FLAG_RESAMPLE

Definition at line 80 of file swresample_internal.h.

Referenced by swr_init(), and swr_set_compensation().

float SwrContext::slev

surround mixing level

Definition at line 81 of file swresample_internal.h.

Referenced by auto_matrix().

float SwrContext::clev

center mixing level

Definition at line 82 of file swresample_internal.h.

Referenced by auto_matrix().

float SwrContext::lfe_mix_level

LFE mixing level.

Definition at line 83 of file swresample_internal.h.

Referenced by auto_matrix().

float SwrContext::rematrix_volume

rematrixing volume coefficient

Definition at line 84 of file swresample_internal.h.

Referenced by auto_matrix(), and swr_init().

float SwrContext::rematrix_maxval

maximum value for rematrixing output

Definition at line 85 of file swresample_internal.h.

Referenced by auto_matrix().

enum AVMatrixEncoding SwrContext::matrix_encoding

matrixed stereo encoding

Definition at line 86 of file swresample_internal.h.

Referenced by auto_matrix().

const int* SwrContext::channel_map

channel index (or -1 if muted channel) map

Definition at line 87 of file swresample_internal.h.

Referenced by swr_convert_internal(), swr_init(), and swr_set_channel_mapping().

int SwrContext::used_ch_count

number of used input channels (mapped channel count if channel_map, otherwise in.ch_count)

Definition at line 88 of file swresample_internal.h.

Referenced by swr_convert_internal(), and swr_init().

enum SwrEngine SwrContext::engine

Definition at line 89 of file swresample_internal.h.

Referenced by swr_init().

struct DitherContext SwrContext::dither

Definition at line 91 of file swresample_internal.h.

Referenced by swr_convert_internal(), swr_free(), swr_init(), swri_dither_init(), and swri_get_dither().

int SwrContext::filter_size

length of each FIR filter in the resampling filterbank relative to the cutoff frequency

Definition at line 93 of file swresample_internal.h.

Referenced by swr_init().

int SwrContext::phase_shift

log2 of the number of entries in the resampling polyphase filterbank

Definition at line 94 of file swresample_internal.h.

Referenced by swr_init().

int SwrContext::linear_interp

if 1 then the resampling FIR filter will be linearly interpolated

Definition at line 95 of file swresample_internal.h.

Referenced by swr_init().

double SwrContext::cutoff

resampling cutoff frequency (swr: 6dB point; soxr: 0dB point).

1.0 corresponds to half the output sample rate

Definition at line 96 of file swresample_internal.h.

Referenced by swr_init().

enum SwrFilterType SwrContext::filter_type

swr resampling filter type

Definition at line 97 of file swresample_internal.h.

Referenced by swr_init().

int SwrContext::kaiser_beta

swr beta value for Kaiser window (only applicable if filter_type == AV_FILTER_TYPE_KAISER)

Definition at line 98 of file swresample_internal.h.

Referenced by swr_init().

double SwrContext::precision

soxr resampling precision (in bits)

Definition at line 99 of file swresample_internal.h.

Referenced by swr_init().

int SwrContext::cheby

soxr: if 1 then passband rolloff will be none (Chebyshev) & irrational ratio approximation precision will be higher

Definition at line 100 of file swresample_internal.h.

Referenced by swr_init().

float SwrContext::min_compensation

swr minimum below which no compensation will happen

Definition at line 102 of file swresample_internal.h.

Referenced by swr_init(), and swr_next_pts().

float SwrContext::min_hard_compensation

swr minimum below which no silence inject / sample drop will happen

Definition at line 103 of file swresample_internal.h.

Referenced by swr_next_pts().

float SwrContext::soft_compensation_duration

swr duration over which soft compensation is applied

Definition at line 104 of file swresample_internal.h.

Referenced by swr_next_pts().

float SwrContext::max_soft_compensation

swr maximum soft compensation in seconds over soft_compensation_duration

Definition at line 105 of file swresample_internal.h.

Referenced by swr_init(), and swr_next_pts().

float SwrContext::async

swr simple 1 parameter async, similar to ffmpegs -async

Definition at line 106 of file swresample_internal.h.

Referenced by swr_init().

int64_t SwrContext::firstpts_in_samples

swr first pts in samples

Definition at line 107 of file swresample_internal.h.

Referenced by swr_init().

int SwrContext::resample_first

1 if resampling must come first, 0 if rematrixing

Definition at line 109 of file swresample_internal.h.

Referenced by swr_convert_internal(), and swr_init().

int SwrContext::rematrix

flag to indicate if rematrixing is needed (basically if input and output layouts mismatch)

Definition at line 110 of file swresample_internal.h.

Referenced by swr_convert_internal(), and swr_init().

int SwrContext::rematrix_custom

flag to indicate that a custom matrix has been defined

Definition at line 111 of file swresample_internal.h.

Referenced by swr_init(), swr_set_matrix(), and swri_rematrix_init().

AudioData SwrContext::in

input audio data

Definition at line 113 of file swresample_internal.h.

Referenced by swr_convert(), swr_convert_internal(), and swr_init().

AudioData SwrContext::postin

post-input audio data: used for rematrix/resample

Definition at line 114 of file swresample_internal.h.

Referenced by swr_convert_internal(), swr_free(), and swr_init().

AudioData SwrContext::midbuf

intermediate audio data (postin/preout)

Definition at line 115 of file swresample_internal.h.

Referenced by swr_convert_internal(), swr_free(), swr_init(), and swri_rematrix_init().

AudioData SwrContext::preout

pre-output audio data: used for rematrix/resample

Definition at line 116 of file swresample_internal.h.

Referenced by swr_convert_internal(), swr_free(), swr_init(), and swri_dither_init().

AudioData SwrContext::out

converted output audio data

Definition at line 117 of file swresample_internal.h.

Referenced by swr_convert(), swr_convert_internal(), and swr_init().

AudioData SwrContext::in_buffer

cached audio data (convert and resample purpose)

Definition at line 118 of file swresample_internal.h.

Referenced by resample(), resample_flush(), swr_convert(), swr_free(), and swr_init().

AudioData SwrContext::silence

temporary with silence

Definition at line 119 of file swresample_internal.h.

Referenced by swr_free(), swr_init(), and swr_inject_silence().

AudioData SwrContext::drop_temp

temporary used to discard output

Definition at line 120 of file swresample_internal.h.

Referenced by swr_convert(), swr_free(), and swr_init().

int SwrContext::in_buffer_index

cached buffer position

Definition at line 121 of file swresample_internal.h.

Referenced by resample(), resample_flush(), swr_convert(), and swr_init().

int SwrContext::in_buffer_count

cached buffer length

Definition at line 122 of file swresample_internal.h.

Referenced by get_delay(), resample(), resample_flush(), swr_convert(), swr_get_delay(), and swr_init().

int SwrContext::resample_in_constraint

1 if the input end was reach before the output end, 0 otherwise

Definition at line 123 of file swresample_internal.h.

Referenced by resample(), swr_convert(), and swr_init().

int SwrContext::flushed

1 if data is to be flushed and no further input is expected

Definition at line 124 of file swresample_internal.h.

Referenced by resample(), swr_convert(), and swr_init().

int64_t SwrContext::outpts

output PTS

Definition at line 125 of file swresample_internal.h.

Referenced by filter_frame(), swr_convert(), swr_init(), and swr_next_pts().

int64_t SwrContext::firstpts

first PTS

Definition at line 126 of file swresample_internal.h.

Referenced by swr_init(), and swr_next_pts().

int SwrContext::drop_output

number of output samples to drop

Definition at line 127 of file swresample_internal.h.

Referenced by swr_convert(), swr_drop_output(), and swr_next_pts().

struct AudioConvert* SwrContext::in_convert

input conversion context

Definition at line 129 of file swresample_internal.h.

Referenced by swr_convert_internal(), swr_free(), swr_init(), swr_set_channel_mapping(), and swr_set_matrix().

struct AudioConvert* SwrContext::out_convert

output conversion context

Definition at line 130 of file swresample_internal.h.

Referenced by swr_convert_internal(), swr_free(), and swr_init().

struct AudioConvert* SwrContext::full_convert

full conversion context (single conversion for input and output)

Definition at line 131 of file swresample_internal.h.

Referenced by swr_convert_internal(), swr_free(), and swr_init().

struct ResampleContext* SwrContext::resample

resampling context

Definition at line 132 of file swresample_internal.h.

Referenced by flush(), get_delay(), resample(), swr_convert(), swr_convert_internal(), swr_free(), swr_get_delay(), swr_init(), and swr_set_compensation().

struct Resampler const* SwrContext::resampler

resampler virtual function table

Definition at line 133 of file swresample_internal.h.

Referenced by resample(), swr_convert(), swr_free(), swr_get_delay(), swr_init(), and swr_set_compensation().

float SwrContext::matrix[SWR_CH_MAX][SWR_CH_MAX]

floating point rematrixing coefficients

Definition at line 135 of file swresample_internal.h.

Referenced by auto_matrix(), swr_set_matrix(), swri_rematrix(), and swri_rematrix_init().

uint8_t* SwrContext::native_matrix

Definition at line 136 of file swresample_internal.h.

Referenced by swri_rematrix(), swri_rematrix_free(), and swri_rematrix_init().

uint8_t* SwrContext::native_one

Definition at line 137 of file swresample_internal.h.

Referenced by swr_convert_internal(), swri_rematrix_free(), and swri_rematrix_init().

uint8_t* SwrContext::native_simd_one

Definition at line 138 of file swresample_internal.h.

Referenced by swr_convert_internal(), and swri_rematrix_free().

uint8_t* SwrContext::native_simd_matrix

Definition at line 139 of file swresample_internal.h.

Referenced by swri_rematrix(), and swri_rematrix_free().

int32_t SwrContext::matrix32[SWR_CH_MAX][SWR_CH_MAX]

17.15 fixed point rematrixing coefficients

Definition at line 140 of file swresample_internal.h.

Referenced by swri_rematrix(), and swri_rematrix_init().

uint8_t SwrContext::matrix_ch[SWR_CH_MAX][SWR_CH_MAX+1]

Lists of input channels per output channel that have non zero rematrixing coefficients.

Definition at line 141 of file swresample_internal.h.

Referenced by swri_rematrix(), and swri_rematrix_init().

mix_1_1_func_type* SwrContext::mix_1_1_f

Definition at line 142 of file swresample_internal.h.

Referenced by swri_rematrix(), and swri_rematrix_init().

mix_1_1_func_type* SwrContext::mix_1_1_simd

Definition at line 143 of file swresample_internal.h.

Referenced by swri_rematrix().

mix_2_1_func_type* SwrContext::mix_2_1_f

Definition at line 145 of file swresample_internal.h.

Referenced by swr_convert_internal(), swri_rematrix(), and swri_rematrix_init().

mix_2_1_func_type* SwrContext::mix_2_1_simd

Definition at line 146 of file swresample_internal.h.

Referenced by swr_convert_internal(), and swri_rematrix().

mix_any_func_type* SwrContext::mix_any_f

Definition at line 148 of file swresample_internal.h.

Referenced by swri_rematrix(), and swri_rematrix_init().

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The documentation for this struct was generated from the following file:

• libswresample/swresample_internal.h