/// <summary>
/// Callback which handles setting up an MSS once the first MpegFrame after Id3v2 data has been read.
/// </summary>
/// <param name="mpegLayer3Frame"> First MpegFrame</param>
/// <param name="mediaStreamAttributes">Empty dictionary for MediaStreamAttributes</param>
/// <param name="mediaStreamDescriptions">Empty dictionary for MediaStreamDescriptions</param>
/// <param name="mediaSourceAttributes">Empty dictionary for MediaSourceAttributes</param>
private void ReadPastId3v2TagsCallback(
MpegFrame mpegLayer3Frame,
Dictionary<MediaStreamAttributeKeys, string> mediaStreamAttributes,
List<MediaStreamDescription> mediaStreamDescriptions,
Dictionary<MediaSourceAttributesKeys, string> mediaSourceAttributes)
{
if (mpegLayer3Frame.FrameSize <= 0)
{
throw new InvalidOperationException("MpegFrame's FrameSize cannot be negative");
}
// Initialize the Mp3 data structures used by the Media pipeline with state from the first frame.
WaveFormatExtensible wfx = new WaveFormatExtensible();
this.MpegLayer3WaveFormat = new MpegLayer3WaveFormat();
this.MpegLayer3WaveFormat.WaveFormatExtensible = wfx;
this.MpegLayer3WaveFormat.WaveFormatExtensible.FormatTag = 85;
this.MpegLayer3WaveFormat.WaveFormatExtensible.Channels = (short)((mpegLayer3Frame.Channels == Channel.SingleChannel) ? 1 : 2);
this.MpegLayer3WaveFormat.WaveFormatExtensible.SamplesPerSec = mpegLayer3Frame.SamplingRate;
this.MpegLayer3WaveFormat.WaveFormatExtensible.AverageBytesPerSecond = mpegLayer3Frame.Bitrate / 8;
this.MpegLayer3WaveFormat.WaveFormatExtensible.BlockAlign = 1;
this.MpegLayer3WaveFormat.WaveFormatExtensible.BitsPerSample = 0;
this.MpegLayer3WaveFormat.WaveFormatExtensible.ExtraDataSize = 12;
this.MpegLayer3WaveFormat.Id = 1;
this.MpegLayer3WaveFormat.BitratePaddingMode = 0;
this.MpegLayer3WaveFormat.FramesPerBlock = 1;
this.MpegLayer3WaveFormat.BlockSize = (short)mpegLayer3Frame.FrameSize;
this.MpegLayer3WaveFormat.CodecDelay = 0;
mediaStreamAttributes[MediaStreamAttributeKeys.CodecPrivateData] = this.MpegLayer3WaveFormat.ToHexString();
this.audioStreamDescription = new MediaStreamDescription(MediaStreamType.Audio, mediaStreamAttributes);
mediaStreamDescriptions.Add(this.audioStreamDescription);
this.trackDuration = new TimeSpan(0, 0, (int)(this.audioStreamLength / MpegLayer3WaveFormat.WaveFormatExtensible.AverageBytesPerSecond));
mediaSourceAttributes[MediaSourceAttributesKeys.Duration] = this.trackDuration.Ticks.ToString(CultureInfo.InvariantCulture);
if (this.audioStream.CanSeek)
{
mediaSourceAttributes[MediaSourceAttributesKeys.CanSeek] = "1";
}
else
{
mediaSourceAttributes[MediaSourceAttributesKeys.CanSeek] = "0";
}
// Report that the Mp3MediaStreamSource has finished initializing its internal state and can now
// pass in Mp3 Samples.
this.ReportOpenMediaCompleted(mediaSourceAttributes, mediaStreamDescriptions);
this.currentFrame = mpegLayer3Frame;
this.currentFrameStartPosition = MpegFrame.FrameHeaderSize;
}
public void SetupTests()
{
this.wfx = new WaveFormatExtensible();
this.wfx.FormatTag = 85;
this.wfx.Channels = 2;
this.wfx.SamplesPerSec = 8000;
this.wfx.AverageBytesPerSecond = 500;
this.wfx.BlockAlign = 1;
this.wfx.BitsPerSample = 16;
this.wfx.ExtraDataSize = 12;
this.mp3wfx = new MpegLayer3WaveFormat();
}
