C Wav Header Struct

wav_header.h

// WAV header spec information:
//https://web.archive.org/web/20140327141505/https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
//http://www.topherlee.com/software/pcm-tut-wavformat.html

typedef struct wav_header {
    // RIFF Header
    char riff_header[4]; // Contains "RIFF"
    int wav_size; // Size of the wav portion of the file, which follows the first 8 bytes. File size - 8
    char wave_header[4]; // Contains "WAVE"
    
    // Format Header
    char fmt_header[4]; // Contains "fmt " (includes trailing space)
    int fmt_chunk_size; // Should be 16 for PCM
    short audio_format; // Should be 1 for PCM. 3 for IEEE Float
    short num_channels;
    int sample_rate;
    int byte_rate; // Number of bytes per second. sample_rate * num_channels * Bytes Per Sample
    short sample_alignment; // num_channels * Bytes Per Sample
    short bit_depth; // Number of bits per sample
    
    // Data
    char data_header[4]; // Contains "data"
    int data_bytes; // Number of bytes in data. Number of samples * num_channels * sample byte size
    // uint8_t bytes[]; // Remainder of wave file is bytes
} wav_header;

This is a C struct typedef you can use to edit the header of a PCM wav file.

Thanks !

👍 <3

The descriptions are helpful. But the datatypes are just plain wrong. Use <stdint.h> definitions since int may be 2 bytes on some platforms and make to use the unsigned variants unlike the ones you're using right now. If you're planning to stamp a byte array into this, also make sure the struct is __attribute__((packed))

The current version may work, but it may not, correct me if I'm wrong. I hope this saves someone some headaches.

@Kasslim You're spot on. I've come a long way since I wrote this. This was written for OSX/iOS where ints are guaranteed to be 32 bit and wouldn't necessarily work with other platforms or compilers.