/// <summary>
/// Loads a wav file from a stream.
/// </summary>
/// <param name="Input">Stream</param>
/// <returns>Loaded Wav file.</returns>
/// <exception cref="IOException">If the input is not a valid WAVE File</exception>
public static WavAudio FromStream(Stream Input)
{
if (Input.Length - Input.Position < 12)
{
throw new IOException("Invalid WAVE file.");
}
WavAudio Result = new WavAudio();
using (BinaryReader rd = new BinaryReader(Input))
{
// File Format documented here: https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
int ChunkID = rd.ReadInt32(); // 46464952 = FFIR ( = RIFF backwards)
int ChunkSize = rd.ReadInt32();
int Format = rd.ReadInt32(); // 45564157 = EVAW ( = WAVE backwards)
if (ChunkID != 0x46464952 || Format != 0x45564157)
{
throw new IOException("Invalid WAVE file.");
}
int SubChunk1ID = rd.ReadInt32();
int SubChunk1Size = rd.ReadInt32();
ushort AudioFormat = rd.ReadUInt16();
if (AudioFormat != 1)
{
throw new Exception("Only uncompressed WAVE files (in PCM format) are supported.");
}
Result.nrChannels = rd.ReadUInt16();
Result.sampleRate = rd.ReadInt32();
Result.byteRate = rd.ReadInt32();
Result.blockAlign = rd.ReadUInt16();
Result.bitsPerSample = rd.ReadUInt16();
int SubChunk2ID = rd.ReadInt32();
int SubChunk2Size = rd.ReadInt32();
Result.data = new byte[SubChunk2Size];
rd.Read(Result.data, 0, SubChunk2Size);
}
return(Result);
}
/// <summary>
/// Loads a wav file from a stream.
/// </summary>
/// <param name="Input">Stream</param>
/// <returns>Loaded Wav file.</returns>
/// <exception cref="IOException">If the input is not a valid WAVE File</exception>
public static WavAudio FromStream(Stream Input)
{
if (Input.Length - Input.Position < 12)
throw new IOException("Invalid WAVE file.");
WavAudio Result = new WavAudio();
using (BinaryReader rd = new BinaryReader(Input))
{
// File Format documented here: https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
int ChunkID = rd.ReadInt32(); // 46464952 = FFIR ( = RIFF backwards)
int ChunkSize = rd.ReadInt32();
int Format = rd.ReadInt32(); // 45564157 = EVAW ( = WAVE backwards)
if (ChunkID != 0x46464952 || Format != 0x45564157)
throw new IOException("Invalid WAVE file.");
int SubChunk1ID = rd.ReadInt32();
int SubChunk1Size = rd.ReadInt32();
ushort AudioFormat = rd.ReadUInt16();
if (AudioFormat != 1)
throw new Exception("Only uncompressed WAVE files (in PCM format) are supported.");
Result.nrChannels = rd.ReadUInt16();
Result.sampleRate = rd.ReadInt32();
Result.byteRate = rd.ReadInt32();
Result.blockAlign = rd.ReadUInt16();
Result.bitsPerSample = rd.ReadUInt16();
int SubChunk2ID = rd.ReadInt32();
int SubChunk2Size = rd.ReadInt32();
Result.data = new byte[SubChunk2Size];
rd.Read(Result.data, 0, SubChunk2Size);
}
return Result;
}
/// <summary>
/// Uploads and prepares an audio sample. To remove the audio from memory (to make room for other audio samples)
/// call <see cref="UnloadAudio"/>.
/// </summary>
/// <param name="Audio">Wav audio.</param>
/// <returns>Audio Sample handle</returns>
public static int UploadAudioSample(WavAudio Audio)
{
ALFormat Format;
switch (Audio.NrChannels)
{
case 1:
switch (Audio.BitsPerSample)
{
case 8:
Format = ALFormat.Mono8;
break;
case 16:
Format = ALFormat.Mono16;
break;
default:
throw new Exception("Only 8 or 16 bits per sample supported.");
}
break;
case 2:
switch (Audio.BitsPerSample)
{
case 8:
Format = ALFormat.Stereo8;
break;
case 16:
Format = ALFormat.Stereo16;
break;
default:
throw new Exception("Only 8 or 16 bits per sample supported.");
}
break;
default:
throw new Exception("Only mono or stereo audio samples supported.");
}
return UploadAudioSample(Audio.Data, Format, Audio.SampleRate);
}
