public BE_CONFIG(LameWaveFormat format)
: this(format, 128)
{
}
public Format(LameWaveFormat format, uint MpeBitRate)
{
lhv1 = new LHV1(format, MpeBitRate);
}
public BE_CONFIG(LameWaveFormat format, uint MpeBitRate)
{
this.dwConfig = BE_CONFIG_LAME;
this.format = new Format(format, MpeBitRate);
}
public ushort nQuality; // Quality Setting, HIGH BYTE should be NOT LOW byte, otherwhise quality=5
// FUTURE USE, SET TO 0, align strucutre to 331 bytes
//[ MarshalAs( UnmanagedType.ByValArray, SizeConst=255-4*4-2 )]
//public byte[] btReserved;//[255-4*sizeof(DWORD) - sizeof( WORD )];
public LHV1(LameWaveFormat format, uint MpeBitRate)
{
if (format.wFormatTag != (short)WaveFormats.Pcm)
{
throw new ArgumentOutOfRangeException("format", "Only PCM format supported");
}
if (format.wBitsPerSample != 16)
{
throw new ArgumentOutOfRangeException("format", "Only 16 bits samples supported");
}
dwStructVersion = 1;
dwStructSize = (uint)Marshal.SizeOf(typeof(BE_CONFIG));
switch (format.nSamplesPerSec)
{
case 8000: //add by jonney
case 16000:
case 22050:
case 24000:
dwMpegVersion = MPEG2;
break;
case 32000:
case 44100:
case 48000:
dwMpegVersion = MPEG1;
break;
default:
throw new ArgumentOutOfRangeException("format", "Unsupported sample rate");
}
dwSampleRate = (uint)format.nSamplesPerSec; // INPUT FREQUENCY
dwReSampleRate = 0; // DON'T RESAMPLE
switch (format.nChannels)
{
case 1:
nMode = MpegMode.MONO;
break;
case 2:
nMode = MpegMode.STEREO;
break;
default:
throw new ArgumentOutOfRangeException("format", "Invalid number of channels");
}
switch (MpeBitRate)
{
case 32:
case 40:
case 48:
case 56:
case 64:
case 80:
case 96:
case 112:
case 128:
case 160: //Allowed bit rates in MPEG1 and MPEG2
break;
case 192:
case 224:
case 256:
case 320: //Allowed only in MPEG1
if (dwMpegVersion != MPEG1)
{
throw new ArgumentOutOfRangeException("MpsBitRate", "Bit rate not compatible with input format");
}
break;
case 8:
case 16:
case 24:
case 144: //Allowed only in MPEG2
if (dwMpegVersion != MPEG2)
{
throw new ArgumentOutOfRangeException("MpsBitRate", "Bit rate not compatible with input format");
}
break;
default:
throw new ArgumentOutOfRangeException("MpsBitRate", "Unsupported bit rate");
}
dwBitrate = MpeBitRate; // MINIMUM BIT RATE
nPreset = LAME_QUALITY_PRESET.LQP_NORMAL_QUALITY; // QUALITY PRESET SETTING
dwPsyModel = 0; // USE DEFAULT PSYCHOACOUSTIC MODEL
dwEmphasis = 0; // NO EMPHASIS TURNED ON
bOriginal = 1; // SET ORIGINAL FLAG
bWriteVBRHeader = 0;
bNoRes = 0; // No Bit resorvoir
bCopyright = 0;
bCRC = 0;
bEnableVBR = 0;
bPrivate = 0;
bStrictIso = 0;
dwMaxBitrate = 0;
dwVbrAbr_bps = 0;
nQuality = 0;
nVbrMethod = VBRMETHOD.VBR_METHOD_NONE;
nVBRQuality = 0;
}