/// <summary>
/// Initializes a new instance of the <see cref="AudioTrackCodecData"/> class.
/// </summary>
/// <param name="esds">The esds box.</param>
public AudioTrackCodecData(AudioSampleEntryBox ase, ElementaryStreamDescriptorFullBox esds)
{
if (esds != null && esds.StreamDescriptor != null)
{
var decoderConfiguration = esds.StreamDescriptor.SubDescriptors.SingleOrDefault(d => d.Tag == DescriptorTag.DECODER_CONFIG) as DecoderConfigurationDescriptor;
if (decoderConfiguration != null)
{
var decoderSpecificInformation = decoderConfiguration.SubDescriptors.SingleOrDefault(d => d.Tag == DescriptorTag.DECODER_SPECIFIC_INFO) as DecoderSpecificInformationDescriptor;
switch (decoderConfiguration.ObjectTypeIndication)
{
case DecoderConfigurationDescriptor.DecoderObjectTypes.MPEG1_AUDIO:
this.PacketSize = 1;
this.AudioTag = 0x55;
break;
case DecoderConfigurationDescriptor.DecoderObjectTypes.MPEG2_AAC_AUDIO_SSRP:
case DecoderConfigurationDescriptor.DecoderObjectTypes.MPEG2_AAC_AUDIO_LC:
case DecoderConfigurationDescriptor.DecoderObjectTypes.MPEG2_AAC_AUDIO_MAIN:
case DecoderConfigurationDescriptor.DecoderObjectTypes.MPEG4_AUDIO:
case DecoderConfigurationDescriptor.DecoderObjectTypes.MPEG2_PART3_AUDIO:
this.PacketSize = 4;
if (decoderSpecificInformation != null && (decoderSpecificInformation.Information[0] == 0x05 || decoderSpecificInformation.Information[0] == 0x1D))
{
this.AudioTag = 0x1610; //HE-AAC
}
else
{
this.AudioTag = 0xFF; //AAC-LC
}
break;
default:
break;
}
this.FourCodecCode = MapAudioTagToFourCodecCode(this.AudioTag);
WaveFormatEx = new WaveFormatEx();
WaveFormatEx.FormatTag = (short)this.AudioTag;
WaveFormatEx.Channels = (short)ase.ChannelCount;
WaveFormatEx.SamplesPerSec = (int)ase.SampleRate;
WaveFormatEx.BitsPerSample = (short)ase.SampleSize;
WaveFormatEx.BlockAlign = 8;
WaveFormatEx.AvgBytesPerSec = WaveFormatEx.SamplesPerSec * WaveFormatEx.Channels * WaveFormatEx.BitsPerSample / WaveFormatEx.BlockAlign;
if (decoderSpecificInformation != null)
{
WaveFormatEx.Size = (short)decoderSpecificInformation.Information.Length;
WaveFormatEx.ExtendedData = decoderSpecificInformation.Information;
}
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="AudioTrackCodecData"/> class.
/// </summary>
/// <param name="esds">The esds box.</param>
public AudioTrackCodecData(AudioSampleEntryBox ase, ElementaryStreamDescriptorFullBox esds)
{
if (esds != null && esds.StreamDescriptor != null)
{
var decoderConfiguration = esds.StreamDescriptor.SubDescriptors.SingleOrDefault(d => d.Tag == DescriptorTag.DECODER_CONFIG) as DecoderConfigurationDescriptor;
if (decoderConfiguration != null)
{
var decoderSpecificInformation = decoderConfiguration.SubDescriptors.SingleOrDefault(d => d.Tag == DescriptorTag.DECODER_SPECIFIC_INFO) as DecoderSpecificInformationDescriptor;
switch (decoderConfiguration.ObjectTypeIndication)
{
case DecoderConfigurationDescriptor.DecoderObjectTypes.MPEG1_AUDIO:
this.PacketSize = 1;
this.AudioTag = 0x55;
break;
case DecoderConfigurationDescriptor.DecoderObjectTypes.MPEG2_AAC_AUDIO_SSRP:
case DecoderConfigurationDescriptor.DecoderObjectTypes.MPEG2_AAC_AUDIO_LC:
case DecoderConfigurationDescriptor.DecoderObjectTypes.MPEG2_AAC_AUDIO_MAIN:
case DecoderConfigurationDescriptor.DecoderObjectTypes.MPEG4_AUDIO:
case DecoderConfigurationDescriptor.DecoderObjectTypes.MPEG2_PART3_AUDIO:
this.PacketSize = 4;
if (decoderSpecificInformation != null && (decoderSpecificInformation.Information[0] == 0x05 || decoderSpecificInformation.Information[0] == 0x1D))
this.AudioTag = 0x1610; //HE-AAC
else
this.AudioTag = 0xFF; //AAC-LC
break;
default:
break;
}
this.FourCodecCode = MapAudioTagToFourCodecCode(this.AudioTag);
WaveFormatEx = new WaveFormatEx();
WaveFormatEx.FormatTag = (short)this.AudioTag;
WaveFormatEx.Channels = (short)ase.ChannelCount;
WaveFormatEx.SamplesPerSec = (int)ase.SampleRate;
WaveFormatEx.BitsPerSample = (short)ase.SampleSize;
WaveFormatEx.BlockAlign = 8;
WaveFormatEx.AvgBytesPerSec = WaveFormatEx.SamplesPerSec * WaveFormatEx.Channels * WaveFormatEx.BitsPerSample / WaveFormatEx.BlockAlign;
if (decoderSpecificInformation != null)
{
WaveFormatEx.Size = (short)decoderSpecificInformation.Information.Length;
WaveFormatEx.ExtendedData = decoderSpecificInformation.Information;
}
}
}
}
