public void Configure(IAudioFrameHeader frameHeader)
{
Mp3FrameHeader mp3FrameHeader = (Mp3FrameHeader)frameHeader;
MpegLayer3WaveFormat layer3WaveFormat1 = new MpegLayer3WaveFormat();
layer3WaveFormat1.nChannels = (ushort)mp3FrameHeader.Channels;
layer3WaveFormat1.nSamplesPerSec = (uint)frameHeader.SamplingFrequency;
layer3WaveFormat1.nAvgBytesPerSec = (uint)mp3FrameHeader.Bitrate / 8U;
layer3WaveFormat1.nBlockSize = (ushort)frameHeader.FrameLength;
MpegLayer3WaveFormat layer3WaveFormat2 = layer3WaveFormat1;
this.CodecPrivateData = WaveFormatExExtensions.ToCodecPrivateData((WaveFormatEx)layer3WaveFormat2);
this.Channels = (int)layer3WaveFormat2.nChannels;
this.SamplingFrequency = frameHeader.SamplingFrequency;
this.Bitrate = new int?(mp3FrameHeader.Bitrate);
this.Name = frameHeader.Name;
this.SetConfigured();
}
public bool Parse(byte[] buffer, int index, int length, bool verbose = false)
{
this.MarkerIndex = new int?();
this.HeaderOffset = 0;
if (length < 4)
{
return(false);
}
int num1 = index;
int num2 = index + length;
int num3;
byte num4;
do
{
bool flag = true;
do
{
flag = true;
if (index + 4 <= num2)
{
num3 = index;
}
else
{
goto label_3;
}
}while ((int)byte.MaxValue != (int)buffer[index++]);
if (index + 3 <= num2)
{
num4 = buffer[index++];
}
else
{
goto label_7;
}
}while (7 != ((int)num4 >> 5 & 7));
goto label_10;
label_3:
return(false);
label_7:
return(false);
label_10:
this.HeaderOffset = index - num1 - 2;
if (this.HeaderOffset < 0)
{
return(false);
}
this.MarkerIndex = new int?(num3);
int index1 = (int)num4 >> 3 & 3;
if (1 == index1)
{
return(false);
}
int version = 1;
if (0 == (index1 & 1))
{
version = (index1 & 2) == 0 ? 3 : 2;
}
int index2 = (int)num4 >> 1 & 3;
if (index2 < 1)
{
return(false);
}
int layer = 4 - index2;
this.HeaderLength = 0 == ((int)num4 & 1) ? 6 : 4;
byte num5 = buffer[index++];
int bitrateIndex = (int)num5 >> 4 & 15;
int bitrate = Mp3FrameHeader.GetBitrate(version, layer, bitrateIndex);
if (bitrate < 1)
{
return(false);
}
int sampleIndex = (int)num5 >> 2 & 3;
int sampleRate = Mp3FrameHeader.GetSampleRate(version, sampleIndex);
if (sampleRate <= 0)
{
return(false);
}
bool paddingFlag = 0 != ((int)num5 >> 1 & 1);
bool flag1 = 0 != ((int)num5 & 1);
byte num6 = buffer[index++];
int num7 = (int)num6 >> 6 & 3;
int num8 = (int)num6 >> 4 & 3;
int num9 = (int)num6 >> 3 & 1;
int num10 = (int)num6 >> 2 & 1;
int num11 = (int)num6 & 3;
if (this.ChannelMode != num7)
{
this.ChannelMode = num7;
this.Name = (string)null;
}
int num12 = num7 == 3 ? 1 : 2;
if (this.Channels != num12)
{
this.Channels = num12;
this.Name = (string)null;
}
if (this.Bitrate != bitrate)
{
this.Bitrate = bitrate;
this.Name = (string)null;
}
if (this.SamplingFrequency != sampleRate)
{
this.SamplingFrequency = sampleRate;
this.Name = (string)null;
}
this.FrameLength = Mp3FrameHeader.GetFrameSize(version, layer, bitrate, sampleRate, paddingFlag);
this.Duration = this.GetDuration(version, layer, sampleRate);
if (string.IsNullOrEmpty(this.Name))
{
this.Name = string.Format("MP3 {0}, {1} sample {2}kHz bitrate {3}kHz {4} channels", (object)Mp3FrameHeader.VersionName[index1], (object)Mp3FrameHeader.LayerName[index2], (object)((double)sampleRate / 1000.0), (object)((double)bitrate / 1000.0), (object)this.Channels);
}
if (verbose)
{
Debug.WriteLine("Configuration MP3 Frame: {0}, {1} sample {2}kHz bitrate {3}kHz channel mode {4}", (object)Mp3FrameHeader.VersionName[index1], (object)Mp3FrameHeader.LayerName[index2], (object)((double)sampleRate / 1000.0), (object)((double)bitrate / 1000.0), (object)num7);
}
return(true);
}