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Dependencies:   ST_I2S ST_FREQUENCY_DIVIDER USBDEVICE

Dependents:   HelloWorld_CCA02M1 HelloWorld_CCA02M1_mbedOS HelloWorld_CCA02M1 Karaoke_CCA01M1_CCA02M1_mbedOS

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PDM2PCMAudio Class Reference
Public Member Functions

PDM2PCMAudio Class Reference

PDM2PCMAudio Conversion Library Class. More...

#include <PDM2PCMAudio.h>

Public Member Functions

 PDM2PCMAudio (uint32_t frequency, uint32_t channels)
 Constructor.
uint32_t pcm2pdm_samples (uint32_t PCM_samples)
 Getting number of PCM samples from nummber of PDM samples.
status_t convert (int16_t *output_buffer, uint16_t *input_buffer, uint32_t volume)
 Converting audio data from PDM to PCM.
status_t scramble (uint16_t *output_buffer, uint16_t *input_buffer, uint32_t size)
 Scrambling audio data.
status_t demux (uint16_t *output_buffer, uint16_t *input_buffer, uint32_t size)
 Demuxing audio data.

Detailed Description

PDM2PCMAudio Conversion Library Class.

Definition at line 83 of file PDM2PCMAudio.h.

Constructor & Destructor Documentation

PDM2PCMAudio ( uint32_t  frequency,
uint32_t  channels 
)

Constructor.

Parameters:
frequencyAudio sampling frequency.
channelsNumber of audio channels to be recorded.

Definition at line 92 of file PDM2PCMAudio.h.

Member Function Documentation

status_t convert ( int16_t *  output_buffer,
uint16_t *  input_buffer,
uint32_t  volume 
)

Converting audio data from PDM to PCM.

Parameters:
output_bufferPointer to output PCM buffer data.
input_bufferPointer to input PDM buffer data.
volumeVolume level (it must be in the range [0..PDM2PCM_MAX_VOLUME]).
Return values:
COMPONENT_OKin case of success, COMPONENT_ERROR otherwise.

Definition at line 87 of file PDM2PCMAudio.cpp.

status_t demux ( uint16_t *  output_buffer,
uint16_t *  input_buffer,
uint32_t  size 
)

Demuxing audio data.

s

Parameters:
output_bufferPointer to output PDM buffer data.
input_bufferPointer to input PDM buffer data.
sizeSize of the buffers (thay has to be equally sized).
Return values:
COMPONENT_OKin case of success, COMPONENT_ERROR otherwise.

Demuxing audio data.

Parameters:
output_bufferPointer to output PDM buffer data.
input_bufferPointer to input PDM buffer data.
sizeSize of the buffers (thay has to be equally sized).
Return values:
COMPONENT_OKin case of success, COMPONENT_ERROR otherwise.

Definition at line 150 of file PDM2PCMAudio.cpp.

uint32_t pcm2pdm_samples ( uint32_t  PCM_samples )

Getting number of PCM samples from nummber of PDM samples.

Parameters:
PCM_samplesNumber of PCM samples.
Return values:
Numberof equivalent PDM samples.

Definition at line 75 of file PDM2PCMAudio.cpp.

status_t scramble ( uint16_t *  output_buffer,
uint16_t *  input_buffer,
uint32_t  size 
)

Scrambling audio data.

Parameters:
output_bufferPointer to output PDM buffer data.
input_bufferPointer to input PDM buffer data.
sizeSize of the buffers (thay has to be equally sized).
Return values:
COMPONENT_OKin case of success, COMPONENT_ERROR otherwise.

Definition at line 134 of file PDM2PCMAudio.cpp.

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