switch_resample.c File Reference

Defines
#define	NORMFACT   (float)0x8000
#define	MAXSAMPLE   (float)0x7FFF
#define	MAXSAMPLEC   (char)0x7F
#define	QUALITY   0
#define	MIN(a, b)   ((a) < (b) ? (a) : (b))
#define	MAX(a, b)   ((a) > (b) ? (a) : (b))
#define	resample_buffer(a, b, c)   a > b ? ((a / 1000) / 2) * c : ((b / 1000) / 2) * c
Functions
switch_status_t	switch_resample_create (switch_audio_resampler_t **new_resampler, int from_rate, switch_size_t from_size, int to_rate, uint32_t to_size, switch_memory_pool_t *pool)
	Prepare a new resampler handle.
uint32_t	switch_resample_process (switch_audio_resampler_t *resampler, float *src, int srclen, float *dst, uint32_t dstlen, int last)
	Resample one float buffer into another using specifications of a given handle.
void	switch_resample_destroy (switch_audio_resampler_t **resampler)
	Destroy an existing resampler handle.
switch_size_t	switch_float_to_short (float *f, short *s, switch_size_t len)
	Convert an array of floats to an array of shorts.
int	switch_char_to_float (char *c, float *f, int len)
	Convert an array of chars to an array of floats.
int	switch_float_to_char (float *f, char *c, int len)
	Convert an array of floats to an array of chars.
int	switch_short_to_float (short *s, float *f, int len)
	Convert an array of shorts to an array of floats.
void	switch_swap_linear (int16_t *buf, int len)
	Perform a byteswap on a buffer of 16 bit samples.
void	switch_generate_sln_silence (int16_t *data, uint32_t samples, uint32_t divisor)
	Generate static noise.
uint32_t	switch_merge_sln (int16_t *data, uint32_t samples, int16_t *other_data, uint32_t other_samples)
void	switch_change_sln_volume (int16_t *data, uint32_t samples, int32_t vol)
	Change the volume of a signed linear audio frame.

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Define Documentation

#define MAX (  a, b   )     ((a) > (b) ? (a) : (b))

#define MAXSAMPLE   (float)0x7FFF

#define MAXSAMPLEC   (char)0x7F

#define MIN (  a, b   )     ((a) < (b) ? (a) : (b))

#define NORMFACT   (float)0x8000

#define QUALITY   0

#define resample_buffer (  a, b, c   )     a > b ? ((a / 1000) / 2) * c : ((b / 1000) / 2) * c

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Function Documentation

uint32_t switch_merge_sln (  int16_t *  data, uint32_t  samples, int16_t *  other_data, uint32_t  other_samples )

{ int i; int32_t x, z; if (samples > other_samples) { x = other_samples; } else { x = samples; } for(i = 0; i < x; i++) { z = data[i] + other_data[i]; switch_normalize_to_16bit(z); data[i] = (int16_t) z; } return x; }

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