AudioResampler

#include <icy/av/audioresampler.h>

Converts audio samples between different formats, sample rates, and channel layouts.

Public Attributes

Return	Name	Description
`SwrContext *`	`ctx`	the conversion context
`AudioCodec`	`iparams`	input audio parameters
`AudioCodec`	`oparams`	output audio parameters
`uint8_t **`	`outSamples`	the output samples buffer
`int`	`outNumSamples`	the number of samples currently in the output buffer
`int`	`outBufferSize`	the number of bytes currently in the buffer
`int`	`maxNumSamples`	the maximum number of samples that can be stored in
`enum AVSampleFormat`	`inSampleFmt`	input sample format
`enum AVSampleFormat`	`outSampleFmt`	output sample format

ctx

SwrContext * ctx

the conversion context

iparams

AudioCodec iparams

input audio parameters

oparams

AudioCodec oparams

output audio parameters

outSamples

uint8_t ** outSamples

the output samples buffer

outNumSamples

int outNumSamples

the number of samples currently in the output buffer

outBufferSize

int outBufferSize

the number of bytes currently in the buffer

maxNumSamples

int maxNumSamples

the maximum number of samples that can be stored in

inSampleFmt

enum AVSampleFormat inSampleFmt

input sample format

outSampleFmt

enum AVSampleFormat outSampleFmt

output sample format

Public Methods

Return	Name	Description
	`AudioResampler`
	`AudioResampler`	Deleted constructor.
	`AudioResampler`	Deleted constructor.
`void`	`open`	Initialise the libswresample context using iparams and oparams. Throws std::runtime_error if the context is already open or if required parameters (channels, sample rate, format) are missing.
`void`	`close`	Free the libswresample context and release the output sample buffer.
`int`	`resample`	Convert the input samples to the output format. NOTE: Input buffers must be contiguous, therefore only interleaved input formats are accepted at this point.

AudioResampler

AudioResampler(const AudioCodec & iparams, const AudioCodec & oparams)

AudioResampler

AudioResampler(const AudioResampler &) = delete

Deleted constructor.

AudioResampler

AudioResampler(AudioResampler &&) = delete

Deleted constructor.

open

void open()

Initialise the libswresample context using iparams and oparams. Throws std::runtime_error if the context is already open or if required parameters (channels, sample rate, format) are missing.

close

void close()

Free the libswresample context and release the output sample buffer.

resample

int resample(uint8_t ** inSamples, int inNumSamples)

Convert the input samples to the output format. NOTE: Input buffers must be contiguous, therefore only interleaved input formats are accepted at this point.

Converted samples are accessible via the outSamples class member.

Parameters

inSamples Pointer to the input sample buffer array.
inNumSamples The number of input samples per channel.

Returns

The number of converted samples, or zero if samples were internally buffered.