public void InitWave(string waveFile)
{
RiffTags riff = new RiffTags(waveFile);
if (riff.FileType != "WAVE")
{
throw new Exception("Input is not a WAVE file!");
}
WaveFmt fmt = WaveFmt.Read(riff["fmt "].Data);
if (fmt.Format != 1)
{
throw new Exception("Input is not PCM format!");
}
if (fmt.Channels != 2)
{
throw new Exception("Input does not have 2 channels!");
}
if (fmt.BitsPerSample != 16)
{
throw new Exception("Input does not have 16 bits per sample!");
}
//if (fmt.SampleRate > 4000)
// throw new Exception("Sample rate must be 4000Hz or less!");
byte[] data = riff["data"].Data;
short[] samples = new short[data.Length / 2];
Buffer.BlockCopy(data, 0, samples, 0, data.Length);
renderer.Samples = samples;
WaveFile = waveFile;
Samples = samples;
Duration = TimeSpan.FromSeconds(data.Length / ((fmt.BitsPerSample * fmt.Channels * fmt.SampleRate) / 8d));
}
public static bool LoadWAV(string fileName, out byte[] pcm, out SDL_AudioSpec spec)
{
pcm = new byte[0];
spec = new SDL_AudioSpec();
byte[] bytes = File.ReadAllBytes(fileName);
int pointer = 0;
WaveHeader header = bytes.Consume <WaveHeader>(ref pointer);
if (header.RiffId != WaveId_RIFF)
{
return(false);
}
if (header.WaveId != WaveId_WAVE)
{
return(false);
}
while (pointer < bytes.Length)
{
WaveChunkHeader chunkHeader = bytes.Consume <WaveChunkHeader>(ref pointer);
if (chunkHeader.Id == WaveId_fmt)
{
WaveFmt fmt = bytes.ReadStruct <WaveFmt>(pointer);
spec = new SDL_AudioSpec()
{
freq = (int)fmt.SampleRate,
channels = (byte)fmt.Channels,
};
if (fmt.FormatTag != 1)
{
return(false);
}
switch (fmt.BitsPerSample)
{
case 8: {
spec.format = AUDIO_U8;
} break;
case 16: {
spec.format = AUDIO_S16LSB;
} break;
}
;
}
else if (chunkHeader.Id == WaveId_data)
{
pcm = bytes.Subarray(pointer, (int)chunkHeader.Size);
}
pointer += (int)chunkHeader.Size;
}
if (spec.format == AUDIO_U8)
{
byte[] newPCM = new byte[pcm.Length * 2];
for (int i = 0; i < pcm.Length; i++)
{
short sample16 = (short)((pcm[i] - 0x80) << 8);
newPCM[i * 2 + 0] = (byte)(sample16 & 0xFF);
newPCM[i * 2 + 1] = (byte)(sample16 >> 8);
}
pcm = newPCM;
spec.format = AUDIO_S16LSB;
}
return(true);
}
