public Task <PCM16Audio> ReadFileAsync(string filename)
{
byte[] data = File.ReadAllBytes(filename);
try {
IPcmAudioSource <short> msf = MSF.Parse(data);
var lwav = new PCM16Audio(
msf.Channels,
msf.SampleRate,
msf.SampleData.ToArray(),
msf.LoopStartSample,
msf.LoopStartSample + msf.LoopSampleCount,
!msf.IsLooping);
if (msf is MSF_MP3 mp3)
{
lwav.OriginalMP3 = mp3.Body;
}
return(Task.FromResult(lwav));
} catch (NotSupportedException) {
throw new AudioImporterException("Cannot read MSF file (unsupported codec?)");
}
}
/// <summary>
/// Creates a new MSF (with a 16-bit PCM codec) using an IPCM16AudioSource object as the source.
/// </summary>
/// <param name="source">The IPCM16AudioSource object</param>
/// <param name="big_endian">Whether to use big-endian (default is true)</param>
/// <returns></returns>
public unsafe static MSF FromAudioSource(IPcmAudioSource <short> source, bool big_endian = true)
{
short[] samples = source.SampleData.ToArray();
MSFHeader header = MSFHeader.Create();
header.codec = big_endian ? 0 : 1;
header.channel_count = source.Channels;
header.data_size = samples.Length * sizeof(short);
header.sample_rate = source.SampleRate;
if (source.IsLooping)
{
header.flags.Flags |= MSFFlag.LoopMarker0;
}
MSF_PCM16 msf;
if (big_endian)
{
BigEndianInt16[] samples_be = new BigEndianInt16[samples.Length];
for (int i = 0; i < samples.Length; i++)
{
samples_be[i] = samples[i];
}
byte[] data = new byte[samples.Length * sizeof(short)];
fixed(BigEndianInt16 *ptr = samples_be)
{
Marshal.Copy((IntPtr)ptr, data, 0, data.Length);
}
msf = new MSF_PCM16BE(header, data);
}
else
{
LittleEndianInt16[] samples_le = new LittleEndianInt16[samples.Length];
for (int i = 0; i < samples.Length; i++)
{
samples_le[i] = samples[i];
}
byte[] data = new byte[samples.Length * sizeof(short)];
fixed(LittleEndianInt16 *ptr = samples_le)
{
Marshal.Copy((IntPtr)ptr, data, 0, data.Length);
}
msf = new MSF_PCM16LE(header, data);
}
if (source.IsLooping)
{
msf.LoopStartSample = source.LoopStartSample;
if (msf.LoopStartSample != source.LoopStartSample)
{
throw new Exception();
}
msf.LoopSampleCount = source.LoopSampleCount;
if (msf.LoopSampleCount != source.LoopSampleCount)
{
throw new Exception();
}
}
return(msf);
}
