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