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// This file is part of the 64k demo project.
// WAV dump backend for debugging audio output to file instead of device.
// Stripped in final build (STRIP_ALL).
#if !defined(DEMO_AUDIO_WAV_DUMP_BACKEND_H)
#define DEMO_AUDIO_WAV_DUMP_BACKEND_H
#include "audio_backend.h"
#include <stdio.h>
#include <vector>
#if !defined(STRIP_ALL)
// WAV file dump backend for debugging
// Captures audio from synth_render() and writes to .wav file
class WavDumpBackend : public AudioBackend {
public:
WavDumpBackend();
~WavDumpBackend();
// AudioBackend interface
void init() override;
void start() override;
void shutdown() override;
// Set output filename (call before init())
void set_output_file(const char* filename);
// Get total samples written
size_t get_samples_written() const { return samples_written_; }
private:
// Write WAV header with known sample count
void write_wav_header(FILE* file, uint32_t num_samples);
// Update WAV header with final sample count
void update_wav_header();
FILE* wav_file_;
std::vector<float> sample_buffer_;
size_t samples_written_;
const char* output_filename_;
bool is_active_;
static const int kSampleRate = 32000;
static const int kBufferSize = 1024;
};
#endif /* !defined(STRIP_ALL) */
#endif /* DEMO_AUDIO_WAV_DUMP_BACKEND_H */
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