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OpenAudio_ArduinoLibrary/AudioStream_F32.h

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/*
* AudioStream_F32
*
* Created: Chip Audette, November 2016
* Purpose; Extend the Teensy Audio Library's "AudioStream" to permit floating-point audio data.
*
* I modeled it directly on the Teensy code in "AudioStream.h" and "AudioStream.cpp", which are
* available here: https://github.com/PaulStoffregen/cores/tree/master/teensy3
*
* MIT License. use at your own risk.
*/
#ifndef _OpenAudio_ArduinoLibrary
#define _OpenAudio_ArduinoLibrary
#include <arm_math.h> //ARM DSP extensions. for speed!
#include <Audio.h> //Teensy Audio Library
class AudioStream_F32;
class AudioConnection_F32;
//create a new structure to hold audio as floating point values.
//modeled on the existing teensy audio block struct, which uses Int16
//https://github.com/PaulStoffregen/cores/blob/268848cdb0121f26b7ef6b82b4fb54abbe465427/teensy3/AudioStream.h
typedef struct audio_block_f32_struct {
unsigned char ref_count;
unsigned char memory_pool_index;
unsigned char reserved1;
unsigned char reserved2;
#if AUDIO_BLOCK_SAMPLES < 128
float32_t data[128]; //limit array size to be no smaller than 128. unstable otherwise?
#else
float32_t data[AUDIO_BLOCK_SAMPLES]; // AUDIO_BLOCK_SAMPLES is 128, from AudioStream.h
#endif
const int length = AUDIO_BLOCK_SAMPLES; // AUDIO_BLOCK_SAMPLES is 128, from AudioStream.h
const float fs_Hz = AUDIO_SAMPLE_RATE; // AUDIO_SAMPLE_RATE is 44117.64706 from AudioStream.h
} audio_block_f32_t;
class AudioConnection_F32
{
public:
AudioConnection_F32(AudioStream_F32 &source, AudioStream_F32 &destination) :
src(source), dst(destination), src_index(0), dest_index(0),
next_dest(NULL)
{ connect(); }
AudioConnection_F32(AudioStream_F32 &source, unsigned char sourceOutput,
AudioStream_F32 &destination, unsigned char destinationInput) :
src(source), dst(destination),
src_index(sourceOutput), dest_index(destinationInput),
next_dest(NULL)
{ connect(); }
friend class AudioStream_F32;
protected:
void connect(void);
AudioStream_F32 &src;
AudioStream_F32 &dst;
unsigned char src_index;
unsigned char dest_index;
AudioConnection_F32 *next_dest;
};
#define AudioMemory_F32(num) ({ \
static audio_block_f32_t data_f32[num]; \
AudioStream_F32::initialize_f32_memory(data_f32, num); \
})
#define AudioMemoryUsage_F32() (AudioStream_F32::f32_memory_used)
#define AudioMemoryUsageMax_F32() (AudioStream_F32::f32_memory_used_max)
#define AudioMemoryUsageMaxReset_F32() (AudioStream_F32::f32_memory_used_max = AudioStream_F32::f32_memory_used)
class AudioStream_F32 : public AudioStream {
public:
AudioStream_F32(unsigned char n_input_f32, audio_block_f32_t **iqueue) : AudioStream(1, inputQueueArray_i16),
num_inputs_f32(n_input_f32), inputQueue_f32(iqueue) {
//active_f32 = false;
destination_list_f32 = NULL;
for (int i=0; i < n_input_f32; i++) {
inputQueue_f32[i] = NULL;
}
};
static void initialize_f32_memory(audio_block_f32_t *data, unsigned int num);
//virtual void update(audio_block_f32_t *) = 0;
static uint8_t f32_memory_used;
static uint8_t f32_memory_used_max;
protected:
//bool active_f32;
unsigned char num_inputs_f32;
static audio_block_f32_t * allocate_f32(void);
static void release(audio_block_f32_t * block);
void transmit(audio_block_f32_t *block, unsigned char index = 0);
audio_block_f32_t * receiveReadOnly_f32(unsigned int index = 0);
audio_block_f32_t * receiveWritable_f32(unsigned int index = 0);
friend class AudioConnection_F32;
private:
AudioConnection_F32 *destination_list_f32;
audio_block_f32_t **inputQueue_f32;
virtual void update(void) = 0;
audio_block_t *inputQueueArray_i16[1]; //two for stereo
static audio_block_f32_t *f32_memory_pool;
static uint32_t f32_memory_pool_available_mask[6];
};
#endif