92 lines
1.5 KiB
C
92 lines
1.5 KiB
C
//
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// Created by bruno on 13. 7. 2026.
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//
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#ifndef AUDIOCODER_ENCODER_H
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#define AUDIOCODER_ENCODER_H
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#define SAMPLE_RATE 48000
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#define MAX_BITS 16
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#define CLOCK_VOICE MAX_BITS
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#define MAX_PACKET 223
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#include <SDL_audio.h>
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#include <stdint.h>
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typedef struct SynthVoice {
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uint32_t phase;
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uint32_t phaseStep;
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uint16_t frequency;
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uint8_t volume;
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} SynthVoice;
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typedef enum {
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TX_IDLE,
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TX_PREAMBLE,
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TX_SYNC,
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TX_DATA,
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TX_END
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} TxState;
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typedef struct {
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unsigned int bitCount;
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unsigned int byteIndex;
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unsigned int bitIndex;
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uint8_t buffer[1024 * 1024 * 8];
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unsigned int bufferSize;
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uint16_t startFreq;
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uint16_t endFreq;
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uint16_t dataSpacing;
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uint16_t clock0;
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uint16_t clock1;
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bool clockState;
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uint32_t symbolSamples;
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uint32_t samplesRemaining;
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TxState state;
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uint32_t preambleSymbols;
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uint32_t syncIndex;
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bool transmitting;
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} Encoder;
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typedef struct AudioData {
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SynthVoice synthVoices[MAX_BITS + 1];
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Encoder *encoder;
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} AudioData;
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extern Encoder encoder;
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extern AudioData encodedAudioData;
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extern SDL_AudioDeviceID dev;
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// Internal audio bus for loopback - simple ring buffer
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#define INTERNAL_BUFFER_SIZE 262144
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extern float internalBusSamples[INTERNAL_BUFFER_SIZE];
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extern volatile uint32_t internalBusWrite;
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extern volatile uint32_t internalBusRead;
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void startEncoder(Encoder *enc);
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void stopEncoder(Encoder *enc);
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void initAudioEncoder();
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extern const uint8_t syncBytes[4];
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#endif //AUDIOCODER_ENCODER_H
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