public static extern int acmStreamOpen(out IntPtr phas, IntPtr had, ref MPEGLayer3WaveFormat pwfxSrc, ref WaveFormatEx pwfxDst, IntPtr pwfltr, IntPtr dwCallback, IntPtr dwInstance, uint fdwOpen);
public static extern int acmFormatSuggest(IntPtr had, ref MPEGLayer3WaveFormat pwfxSrc, ref WaveFormatEx pwfxDst, uint cbwfxDst, uint fdwSuggest);
public static extern int acmStreamOpen(out IntPtr phas, IntPtr had, ref MPEGLayer3WaveFormat pwfxSrc, ref WaveFormatEx pwfxDst, IntPtr pwfltr, IntPtr dwCallback, IntPtr dwInstance, uint fdwOpen);
/// <summary> </summary>
internal static void LoadMP3_ReadFrameData(WzSound sound, BinaryReader reader, int cbData)
{
uint dwFrameFormat = (uint)(reader.ReadByte() << 24 | reader.ReadByte() << 16 | reader.ReadByte() << 08 | reader.ReadByte());
reader.BaseStream.Seek(-4, SeekOrigin.Current);
WaveFormatEx wf = new WaveFormatEx();
if ((dwFrameFormat >> 21) != 0x7FF)
{
throw new Exception();
}
while ((dwFrameFormat >> 21) == 0x7FF)
{
// ---vv--- (0 = mpeg2.5, 1 = reserved, 2 = mpeg2, 3 = mpeg1)
int version = (int)(dwFrameFormat >> 19) & 3;
// -----ll- (0 = reserved, 1 = layer3, 2 = layer2, 3 = layer1)
int layer = 3 - (int)((dwFrameFormat >> 17) & 3);
int crc = (int)(dwFrameFormat >> 16) & 1;
int bitrate = (int)(dwFrameFormat >> 12) & 15;
int frequency = (int)(dwFrameFormat >> 10) & 3;
int padding = (int)(dwFrameFormat >> 9) & 1;
int private_bit = (int)(dwFrameFormat >> 8) & 1;
int channel = 1 + (int)(dwFrameFormat >> 6) & 3;
int mode_extension = (int)(dwFrameFormat >> 4) & 3;
int copyright = (int)(dwFrameFormat >> 3) & 1;
int original = (int)(dwFrameFormat >> 2) & 1;
int emphasis = (int)(dwFrameFormat) & 3;
int bitrate_ = MpegBitRate[version == 3 ? 0 : 1, layer, bitrate];
int length = (int)((cbData / bitrate_) * 8.0);
if (version == 1 || layer == 3 || bitrate == 0 || frequency == 3)
{
break;
}
wf.wFormatTag = SoundDX8Constants.WAVE_FORMAT_MPEGLAYER3;
wf.nChannels = (ushort)channel;
wf.nSamplesPerSec = MpegSamplesPerSec[version, frequency];
wf.nAvgBytesPerSec = (uint)(cbData / (length / 1000.0));
wf.nBlockAlign = 1;
wf.wBitsPerSample = 0;
wf.cbSize = 12;
// 目前不處理 extra 的部份
sound.Duration = length;
break;
}
MPEGLayer3WaveFormat mpegwf = new MPEGLayer3WaveFormat();
mpegwf.wfx = wf;
mpegwf.wID = SoundDX8Constants.MPEGLAYER3_ID_MPEG;
mpegwf.fdwFlags = SoundDX8Constants.MPEGLAYER3_FLAG_PADDING_OFF; // (default)
mpegwf.nBlockSize = 522; //144 * 4 (default)
mpegwf.nFramesPerBlock = 1; // (default)
mpegwf.nCodecDelay = 0;
WzMediaType wzmt = new WzMediaType();
wzmt.majortype = SoundDX8Constants.MEDIATYPE_Stream;
wzmt.subtype = SoundDX8Constants.MEDIASUBTYPE_WAVE;
wzmt.Unknow1_Byte = 0;
wzmt.Unknow2_Byte = 1;
wzmt.formattype = SoundDX8Constants.WMFORMAT_WaveFormatEx;
wzmt.cbFormat = MPEGLayer3WaveFormat.StructureSize;
wzmt.pbFormat = mpegwf.ToArray();
sound.MediaType = wzmt;
sound.DataSize = cbData;
sound.SoundData = reader.ReadBytes(cbData);
}
public static extern int acmFormatSuggest(IntPtr had, ref MPEGLayer3WaveFormat pwfxSrc, ref WaveFormatEx pwfxDst, uint cbwfxDst, uint fdwSuggest);
