Resampling Algorithm
[Audio Manipulation Algorithms]

Sample rate conversion algorithm. More...

Typedefs
typedef typedefPJ_BEGIN_DECL struct pjmedia_resample	pjmedia_resample
Functions
pj_status_t	pjmedia_resample_create (pj_pool_t *pool, pj_bool_t high_quality, pj_bool_t large_filter, unsigned channel_count, unsigned rate_in, unsigned rate_out, unsigned samples_per_frame, pjmedia_resample **p_resample)
void	pjmedia_resample_run (pjmedia_resample *resample, const pj_int16_t *input, pj_int16_t *output)
unsigned	pjmedia_resample_get_input_size (pjmedia_resample *resample)
void	pjmedia_resample_destroy (pjmedia_resample *resample)

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Detailed Description

This section describes the base resampling functions. In addition to this, application can use the Resample Port which provides media port abstraction for the base resampling algorithm.

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Typedef Documentation

typedef typedefPJ_BEGIN_DECL struct pjmedia_resample pjmedia_resample

Opaque resample session.

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Function Documentation

pj_status_t pjmedia_resample_create	(	pj_pool_t *	pool,
		pj_bool_t	high_quality,
		pj_bool_t	large_filter,
		unsigned	channel_count,
		unsigned	rate_in,
		unsigned	rate_out,
		unsigned	samples_per_frame,
		pjmedia_resample **	p_resample
	)

Create a frame based resample session.

Parameters:

	pool	Pool to allocate the structure and buffers.
	high_quality	If true, then high quality conversion will be used, at the expense of more CPU and memory, because temporary buffer needs to be created.
	large_filter	If true, large filter size will be used.
	channel_count	Number of channels.
	rate_in	Clock rate of the input samples.
	rate_out	Clock rate of the output samples.
	samples_per_frame	Number of samples per frame in the input.
	p_resample	Pointer to receive the resample session.

Returns:

PJ_SUCCESS on success.

void pjmedia_resample_run	(	pjmedia_resample *	resample,
		const pj_int16_t *	input,
		pj_int16_t *	output
	)

Use the resample session to resample a frame. The frame must have the same size and settings as the resample session, or otherwise the behavior is undefined.

Parameters:

	resample	The resample session.
	input	Buffer containing the input samples.
	output	Buffer to store the output samples.

unsigned pjmedia_resample_get_input_size

(

pjmedia_resample *

resample

)

Get the input frame size of a resample session.

Parameters:

resample

The resample session.

Returns:

The frame size, in number of samples.

void pjmedia_resample_destroy

(

pjmedia_resample *

resample

)

Destroy the resample.

Parameters:

resample

The resample session.