private static string BuildCodecPrivateData(AacFrameHeader aacFrameHeader)
{
Func <AacFrameHeader, string> privateDataFactory = AacDecoderSettings.Parameters.CodecPrivateDataFactory;
if (null != privateDataFactory)
{
return(privateDataFactory(aacFrameHeader));
}
AacDecoderParameters.WaveFormatEx configurationFormat = AacDecoderSettings.Parameters.ConfigurationFormat;
WaveFormatEx waveFormatEx;
switch (configurationFormat)
{
case AacDecoderParameters.WaveFormatEx.RawAac:
if (!AacDecoderSettings.Parameters.UseRawAac)
{
throw new NotSupportedException("AacDecoderSettings.Parameters.UseRawAac must be enabled when using AacDecoderParameters.WaveFormatEx.RawAac");
}
RawAacWaveInfo rawAacWaveInfo1 = new RawAacWaveInfo();
rawAacWaveInfo1.nChannels = aacFrameHeader.ChannelConfig;
rawAacWaveInfo1.nSamplesPerSec = (uint)aacFrameHeader.SamplingFrequency;
RawAacWaveInfo rawAacWaveInfo2 = rawAacWaveInfo1;
TimeSpan duration = aacFrameHeader.Duration;
double num1;
if (duration.TotalSeconds > 0.0)
{
double num2 = (double)aacFrameHeader.FrameLength;
duration = aacFrameHeader.Duration;
double totalSeconds = duration.TotalSeconds;
num1 = num2 / totalSeconds;
}
else
{
num1 = 0.0;
}
int num3 = (int)(uint)num1;
rawAacWaveInfo2.nAvgBytesPerSec = (uint)num3;
rawAacWaveInfo1.pbAudioSpecificConfig = aacFrameHeader.AudioSpecificConfig;
waveFormatEx = rawAacWaveInfo1;
break;
case AacDecoderParameters.WaveFormatEx.HeAac:
HeAacWaveInfo heAacWaveInfo = new HeAacWaveInfo();
heAacWaveInfo.wPayloadType = AacDecoderSettings.Parameters.UseRawAac ? (ushort)0 : (ushort)1;
heAacWaveInfo.nChannels = aacFrameHeader.ChannelConfig;
heAacWaveInfo.nSamplesPerSec = (uint)aacFrameHeader.SamplingFrequency;
heAacWaveInfo.pbAudioSpecificConfig = aacFrameHeader.AudioSpecificConfig;
waveFormatEx = heAacWaveInfo;
break;
default:
throw new NotSupportedException("Unknown WaveFormatEx type: " + (object)configurationFormat);
}
return(WaveFormatExExtensions.ToCodecPrivateData(waveFormatEx));
}
public void Configure(IAudioFrameHeader frameHeader)
{
AacFrameHeader aacFrameHeader = (AacFrameHeader)frameHeader;
CodecPrivateData = AacConfigurator.BuildCodecPrivateData(aacFrameHeader);
Name = frameHeader.Name;
Channels = aacFrameHeader.ChannelConfig;
SamplingFrequency = frameHeader.SamplingFrequency;
SetConfigured();
}
public static byte[] DefaultAudioSpecificConfigFactory(AacFrameHeader aacFrameHeader)
{
int num = aacFrameHeader.Profile + 1;
if (1 == num && AacAudioSpecificConfig.RemapObjectType1.HasValue)
{
num = AacAudioSpecificConfig.RemapObjectType1.Value;
Debug.WriteLine("AacConfigurator.AudioSpecificConfig: Changing AAC object type from 1 to {0}.", (object)num);
}
return(new byte[2]
{
(byte)(num << 3 | aacFrameHeader.FrequencyIndex >> 1 & 7),
(byte)(aacFrameHeader.FrequencyIndex << 7 | (int)aacFrameHeader.ChannelConfig << 3)
});
}
