/// <summary>
/// Decode stream and get PCM waveform.
/// MP3ストリームをデコードして、PCMを得ます。
/// </summary>
/// <param name="mp3data">mp3 stream</param>
/// <returns>pcm waveform</returns>
public byte[] Decode(byte[] mp3data)
{
if (deviceHandle == IntPtr.Zero)
{
throw new InvalidOperationException("Stream is not open.");
}
byte[] input = new byte[buffer.Length + mp3data.Length];
Array.Copy(buffer, input, buffer.Length);
Array.Copy(mp3data, 0, input, buffer.Length, mp3data.Length);
uint size;
Win32.acmStreamSize(deviceHandle, (uint)input.Length, out size, 1);
byte[] output = new byte[maxBufferSize];
GCHandle hIn = GCHandle.Alloc(input, GCHandleType.Pinned);
GCHandle hOut = GCHandle.Alloc(output, GCHandleType.Pinned);
IntPtr pHeader = Marshal.AllocHGlobal(Win32.SizeOfAcmStreamHeader);
Win32.AcmStreamHeader ash = new Win32.AcmStreamHeader();
ash.cbStruct = (uint)Win32.SizeOfAcmStreamHeader;
ash.pbSrc = hIn.AddrOfPinnedObject();
ash.cbSrcLength = (uint)input.Length;
ash.cbSrcLengthUsed = 0;
ash.pbDst = hOut.AddrOfPinnedObject();
ash.cbDstLength = (uint)output.Length;
ash.cbDstLengthUsed = 0;
Marshal.StructureToPtr(ash, pHeader, true);
Win32.acmStreamPrepareHeader(deviceHandle, pHeader, 0);
Win32.acmStreamConvert(deviceHandle, pHeader, 0);
Win32.acmStreamUnprepareHeader(deviceHandle, pHeader, 0);
ash = (Win32.AcmStreamHeader)Marshal.PtrToStructure(pHeader, typeof(Win32.AcmStreamHeader));
hIn.Free();
hOut.Free();
Array.Resize <byte>(ref buffer, (int)(ash.cbSrcLength - ash.cbSrcLengthUsed));
Array.Copy(input, ash.cbSrcLengthUsed, buffer, 0, ash.cbSrcLength - ash.cbSrcLengthUsed);
byte[] decodedSamples = new byte[ash.cbDstLengthUsed];
Array.Copy(output, decodedSamples, decodedSamples.Length);
return(decodedSamples);
}
/// <summary>
/// Decode stream and get PCM waveform.
/// MP3�X�g���[����f�R�[�h���āAPCM�܂��B
/// </summary>
/// <param name="mp3data">mp3 stream</param>
/// <returns>pcm waveform</returns>
public byte[] Decode(byte[] mp3data)
{
if (deviceHandle == IntPtr.Zero)
throw new InvalidOperationException("Stream is not open.");
byte[] input = new byte[buffer.Length + mp3data.Length];
Array.Copy(buffer, input, buffer.Length);
Array.Copy(mp3data, 0, input, buffer.Length, mp3data.Length);
uint size;
Win32.acmStreamSize(deviceHandle, (uint)input.Length, out size, 1);
byte[] output = new byte[maxBufferSize];
GCHandle hIn = GCHandle.Alloc(input, GCHandleType.Pinned);
GCHandle hOut = GCHandle.Alloc(output, GCHandleType.Pinned);
IntPtr pHeader = Marshal.AllocHGlobal(Win32.SizeOfAcmStreamHeader);
Win32.AcmStreamHeader ash = new Win32.AcmStreamHeader();
ash.cbStruct = (uint)Win32.SizeOfAcmStreamHeader;
ash.pbSrc = hIn.AddrOfPinnedObject();
ash.cbSrcLength = (uint)input.Length;
ash.cbSrcLengthUsed = 0;
ash.pbDst = hOut.AddrOfPinnedObject();
ash.cbDstLength = (uint)output.Length;
ash.cbDstLengthUsed = 0;
Marshal.StructureToPtr(ash, pHeader, true);
Win32.acmStreamPrepareHeader(deviceHandle, pHeader, 0);
Win32.acmStreamConvert(deviceHandle, pHeader, 0);
Win32.acmStreamUnprepareHeader(deviceHandle, pHeader, 0);
ash = (Win32.AcmStreamHeader)Marshal.PtrToStructure(pHeader, typeof(Win32.AcmStreamHeader));
hIn.Free();
hOut.Free();
Array.Resize<byte>(ref buffer, (int)(ash.cbSrcLength - ash.cbSrcLengthUsed));
Array.Copy(input, ash.cbSrcLengthUsed, buffer, 0, ash.cbSrcLength - ash.cbSrcLengthUsed);
byte[] decodedSamples = new byte[ash.cbDstLengthUsed];
Array.Copy(output, decodedSamples, decodedSamples.Length);
return decodedSamples;
}
