/// <summary>
/// Initializes a new instance of the WaveFormat class.
/// </summary>
/// <param name="waveFormatExtensible">WaveFormatExtensible instance representing an audio format.</param>
public WaveFormat(WaveFormatExtensible waveFormatExtensible)
{
if (waveFormatExtensible == null)
{
throw new ArgumentNullException("waveFormatExtensible");
}
this.WaveFormatExtensible = waveFormatExtensible;
}
/// <summary>
/// Initializes a new instance of the WaveFormat class.
/// </summary>
/// <param name="waveFormatExtensible">WaveFormatExtensible instance representing an audio format.</param>
public WaveFormat(WaveFormatExtensible waveFormatExtensible)
{
if (waveFormatExtensible == null)
{
throw new ArgumentNullException("waveFormatExtensible");
}
this.WaveFormatExtensible = waveFormatExtensible;
}
/// <summary>
/// Returns a string representing the structure in little-endian
/// hexadecimal format.
/// </summary>
/// <remarks>
/// The string generated here is intended to be passed as
/// CodecPrivateData for Silverlight 2's MediaStreamSource
/// </remarks>
/// <returns>
/// A string representing the structure in little-endia hexadecimal
/// format.
/// </returns>
public override string ToHexString()
{
string s = WaveFormatExtensible.ToHexString();
s += string.Format(CultureInfo.InvariantCulture, "{0:X4}", this.Id).ToLittleEndian();
s += string.Format(CultureInfo.InvariantCulture, "{0:X8}", this.BitratePaddingMode).ToLittleEndian();
s += string.Format(CultureInfo.InvariantCulture, "{0:X4}", this.BlockSize).ToLittleEndian();
s += string.Format(CultureInfo.InvariantCulture, "{0:X4}", this.FramesPerBlock).ToLittleEndian();
s += string.Format(CultureInfo.InvariantCulture, "{0:X4}", this.CodecDelay).ToLittleEndian();
return(s);
}
/// <summary>
/// Returns a string representing all of the fields in the object.
/// </summary>
/// <returns>
/// A string representing all of the fields in the object.
/// </returns>
public override string ToString()
{
return("MPEGLAYER3 "
+ WaveFormatExtensible.ToString()
+ string.Format(
CultureInfo.InvariantCulture,
"ID: {0}, Flags: {1}, BlockSize: {2}, FramesPerBlock {3}, CodecDelay {4}",
this.Id,
this.BitratePaddingMode,
this.BlockSize,
this.FramesPerBlock,
this.CodecDelay));
}
/// <summary>
/// Initializes a new instance of the HeAacWaveFormat class.
/// </summary>
/// <param name="waveFormatExtensible">WaveFormatExtensible instance representing this audio format.</param>
public HeAacWaveFormat(WaveFormatExtensible waveFormatExtensible)
: base(waveFormatExtensible)
{
}
/// <summary>
/// Initializes a new instance of the HeAacWaveFormat class.
/// </summary>
/// <param name="waveFormatExtensible">WaveFormatExtensible instance representing this audio format.</param>
public HeAacWaveFormat(WaveFormatExtensible waveFormatExtensible)
: base(waveFormatExtensible)
{
}
/// <summary>
/// Initializes a WaveFormatExtensible instance representing an MP3 frame.
/// </summary>
/// <param name="audioFrame">Audio frame representing an MP3 frame.</param>
/// <returns>A WaveFormatExtensible for the supplied audio frame.</returns>
private static MpegLayer3WaveFormat CreateMp3WaveFormat(AudioFrame audioFrame)
{
if (audioFrame == null)
{
throw new ArgumentNullException("audioFrame");
}
WaveFormatExtensible waveFormatExtensible = new WaveFormatExtensible()
{
AverageBytesPerSecond = audioFrame.BitRate / 8,
BitsPerSample = 0,
BlockAlign = 1,
Channels = (short)audioFrame.NumberOfChannels,
FormatTag = 85,
SamplesPerSec = audioFrame.SamplingRate,
Size = 12
};
MpegLayer3WaveFormat waveFormat = new MpegLayer3WaveFormat(waveFormatExtensible);
waveFormat.Id = 1;
waveFormat.BitratePaddingMode = 0;
waveFormat.FramesPerBlock = 1;
waveFormat.BlockSize = (short)audioFrame.FrameSize;
waveFormat.CodecDelay = 0;
return waveFormat;
}
/// <summary>
/// Initializes a WaveFormatExtensible instance representing an AAC+ frame.
/// </summary>
/// <param name="audioFrame">Audio frame representing an AAC+ frame.</param>
/// <returns>A WaveFormatExtensible for the supplied audio frame.</returns>
private static HeAacWaveFormat CreateAacPlusFormat(AudioFrame audioFrame)
{
if (audioFrame == null)
{
throw new ArgumentNullException("audioFrame");
}
WaveFormatExtensible wfx = new WaveFormatExtensible();
wfx.FormatTag = 0x1610;
wfx.Channels = (short)audioFrame.NumberOfChannels;
wfx.SamplesPerSec = audioFrame.SamplingRate;
wfx.AverageBytesPerSecond = audioFrame.BitRate / 8;
wfx.BlockAlign = 1;
wfx.BitsPerSample = 0;
wfx.Size = 12;
HeAacWaveFormat aacf = new HeAacWaveFormat(wfx);
// Extra 3 words in WAVEFORMATEX
aacf.PayloadType = 0x1; // Audio Data Transport Stream (ADTS). The stream contains an adts_sequence, as defined by MPEG-2.
aacf.AudioProfileLevelIndication = 0xFE;
aacf.StructType = 0;
return aacf;
}
/// <summary>
/// Initializes a new instance of the MpegLayer3WaveFormat class.
/// </summary>
/// <param name="waveFormatExtensible">WaveFormatExtensible instance representing this audio format.</param>
public MpegLayer3WaveFormat(WaveFormatExtensible waveFormatExtensible)
: base(waveFormatExtensible)
{
}
/// <summary>
/// Initializes a new instance of the MpegLayer3WaveFormat class.
/// </summary>
/// <param name="waveFormatExtensible">WaveFormatExtensible instance representing this audio format.</param>
public MpegLayer3WaveFormat(WaveFormatExtensible waveFormatExtensible)
: base(waveFormatExtensible)
{
}
