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high resolution for I2S input/output, added S/PDIF input/output with configurable sample rate and 24 bit #14

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Merged
merged 5 commits into from
May 18, 2022
Merged

high resolution for I2S input/output, added S/PDIF input/output with configurable sample rate and 24 bit #14

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6a5d40a
fixed a typo int -> float -> int conversion is now lossless
IDC-Dragon May 15, 2022
cce309f
have defaults for AudioSettings_F32
IDC-Dragon May 15, 2022
fa6885d
I2S output was sending 32 bits already, but only 16 were used. Now, s…
IDC-Dragon May 15, 2022
4fe37d5
Added float modules for 24 bit precision S/PDIF I/O. They are forked …
IDC-Dragon May 15, 2022
d9efa31
full resolution for I2S input, all 32 bits are read and converted to …
IDC-Dragon May 15, 2022
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2 changes: 1 addition & 1 deletion AudioConvert_F32.h
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Expand Up @@ -36,7 +36,7 @@ class AudioConvert_I16toF32 : public AudioStream_F32 //receive Int and transmits

static void convertAudio_I16toF32(audio_block_t *in, audio_block_f32_t *out, int len) {
//WEA Method. Should look at CMSIS arm_q15_to_float instead: https://www.keil.com/pack/doc/CMSIS/DSP/html/group__q15__to__x.html#gaf8b0d2324de273fc430b0e61ad4e9eb2
const float MAX_INT = 32678.0;
const float MAX_INT = 32768.0;
for (int i = 0; i < len; i++) out->data[i] = (float)(in->data[i]);
arm_scale_f32(out->data, 1.0/MAX_INT, out->data, out->length); //divide by 32678 to get -1.0 to +1.0
}
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2 changes: 1 addition & 1 deletion AudioSettings_F32.cpp
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@@ -1,5 +1,5 @@


#include <Arduino.h>
#include "AudioSettings_F32.h"
#include "AudioStream_F32.h"

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4 changes: 3 additions & 1 deletion AudioSettings_F32.h
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Expand Up @@ -2,9 +2,11 @@
#ifndef _AudioSettings_F32_
#define _AudioSettings_F32_

#include <AudioStream.h> // for AUDIO_SAMPLE_RATE_EXACT, AUDIO_BLOCK_SAMPLES

class AudioSettings_F32 {
public:
AudioSettings_F32(float fs_Hz, int block_size) :
AudioSettings_F32(float fs_Hz=AUDIO_SAMPLE_RATE_EXACT, int block_size=AUDIO_BLOCK_SAMPLES) :
sample_rate_Hz(fs_Hz), audio_block_samples(block_size) {}
const float sample_rate_Hz;
const int audio_block_samples;
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3 changes: 3 additions & 0 deletions OpenAudio_ArduinoLibrary.h
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Expand Up @@ -22,7 +22,10 @@
#include "AudioMultiply_F32.h"
#include "AudioSettings_F32.h"
#include "input_i2s_f32.h"
#include "input_spdif3_F32.h"
#include "async_input_spdif3_F32.h"
#include "output_i2s_f32.h"
#include "output_spdif3_F32.h"
#include "play_queue_f32.h"
#include "record_queue_f32.h"
#include "synth_pinknoise_f32.h"
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