wrWav.h

#pragma once

#include <stdint.h>
#include <stdio.h>

typedef struct{
    char     sGroupID[4];  // "RIFF"
    uint32_t dwFileLength; // total file size
    char     sRiffType[4]; // "WAVE"
} WaveHeader_t;

#define WAVE_FORMAT_PCM         0x0001
#define WAVE_FORMAT_IEEE_FLOAT  0x0003
#define WAVE_FORMAT_ALAW        0x0006
#define WAVE_FORMAT_MULAW       0x0007
#define WAVE_FORMAT_EXTENSIBLE  0xFFFE

typedef struct{
	char     sGroupID[4];     // "fmt "
	uint32_t dwChunkSize;     // length of this chunk *after* this line
	uint16_t wFormatTag;      // see WAVE_FORMAT_* defines
	uint16_t wChannels;       // channels of audio
	uint32_t dwSamplesPerSec; // sample rate
	uint32_t dwAvgBytesPerSec;// sampleRate * blockAlign
	uint16_t wBlockAlign;     // wChannels * (dwBitsPerSample / 8)
	uint16_t dwBitsPerSample; // 24
} WaveFormat_t;

typedef struct{
    char     sGroupID[4];
    uint32_t dwChunkSize;
    uint32_t dwSampleLength; // optional? see chunksize
} WaveFact_t; // Required for non PCM data (ie floats)

typedef struct{
	char     sGroupID[4];  // "data"
	uint32_t dwChunkSize;  // length of the below array
	void*    sampleData_p; // pointer to the audio data buffer
} WaveData_t;

typedef struct{
	WaveHeader_t* h;
	WaveFormat_t* f;
	WaveFact_t*   fa;
	WaveData_t*   d;
	FILE*         file_read;
	FILE*         file_write;
} WavFile_t;

WavFile_t* wav_load( FILE* file );
float* wav_malloc_float( WavFile_t* src, int* count );
void wav_save_as( FILE* dest, WavFile_t* src );
WavFile_t* wav_new( uint16_t channels
                  , uint32_t samplerate
                  , uint16_t bitdepth
                  , FILE*    file
                  );

WavFile_t* wav_append( WavFile_t* wf
                     , void*      audio
                     , uint32_t   sample_count
                     );
void wav_close( WavFile_t* wf );