Resample Port

Audio sample rate conversion. More...

Enumerations
enum	pjmedia_resample_port_options {   PJMEDIA_RESAMPLE_USE_LINEAR = 1 ,   PJMEDIA_RESAMPLE_USE_SMALL_FILTER = 2 ,   PJMEDIA_RESAMPLE_DONT_DESTROY_DN = 4 }

Functions
pj_status_t	pjmedia_resample_port_create (pj_pool_t *pool, pjmedia_port *dn_port, unsigned clock_rate, unsigned options, pjmedia_port **p_port)

Detailed Description

This section describes media port abstraction for Resampling Algorithm.

Enumeration Type Documentation

pjmedia_resample_port_options

enum pjmedia_resample_port_options

Option flags that can be specified when creating resample port.

Enumerator
PJMEDIA_RESAMPLE_USE_LINEAR	Do not use high quality resampling algorithm, but use linear algorithm instead.
PJMEDIA_RESAMPLE_USE_SMALL_FILTER	Use small filter workspace when high quality resampling is used.
PJMEDIA_RESAMPLE_DONT_DESTROY_DN	Do not destroy downstream port when resample port is destroyed.

Function Documentation

pjmedia_resample_port_create()

pj_status_t pjmedia_resample_port_create	(	pj_pool_t *	pool,
		pjmedia_port *	dn_port,
		unsigned	clock_rate,
		unsigned	options,
		pjmedia_port **	p_port
	)

Create a resample port. This creates a bidirectional resample session, which will resample frames when the port's get_frame() and put_frame() is called.

When the resample port's get_frame() is called, this port will get a frame from the downstream port and resample the frame to the target clock rate before returning it to the caller.

When the resample port's put_frame() is called, this port will resample the frame to the downstream port's clock rate before giving the frame to the downstream port.

Parameters

pool	Pool to allocate the structure and buffers.
dn_port	The downstream port, which clock rate is to be converted to the target clock rate.
clock_rate	Target clock rate.
options	Flags from pjmedia_resample_port_options. When this flag is zero, the default behavior is to use high quality resampling with large filter, and to destroy downstream port when resample port is destroyed.
p_port	Pointer to receive the resample port instance.

Returns

PJ_SUCCESS on success.

References PJ_END_DECL.