(file_data: string) -> (format: Waveformatex, samples: string, success: bool = false, extra: Wave_Extra_Info)
Reads the format and sample data out of a WAV file held in memory. samples points into
file_data; nothing is copied. success is false when the file is not a RIFF/WAVE with a
readable fmt and data chunk in PCM or ADPCM.
bytes: [48] u8 = .[
82, 73, 70, 70, 40, 0, 0, 0, 87, 65, 86, 69, // "RIFF", size, "WAVE"
102, 109, 116, 32, 16, 0, 0, 0, 1, 0, 1, 0, // "fmt ", PCM, mono
0x40, 0x1f, 0, 0, 0x40, 0x1f, 0, 0, 1, 0, 8, 0, // 8000 Hz, 8 bits
100, 97, 116, 97, 4, 0, 0, 0, 1, 2, 3, 4]; // "data", 4 samples
file: string = .{48, bytes.data};
format, samples, ok := get_wav_header(file);
assert(ok && format.nChannels == 1 && format.nSamplesPerSec == 8000 && samples.count == 4);