/// <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 string ToHexString()
{
string s = WaveFormatExtensible.ToHexString();
char[] mpeglayer3Data = new char[6 * 4];
BitTools.ToHexHelper(4, this.Id, 0, mpeglayer3Data);
BitTools.ToHexHelper(8, this.BitratePaddingMode, 4, mpeglayer3Data);
BitTools.ToHexHelper(4, this.BlockSize, 12, mpeglayer3Data);
BitTools.ToHexHelper(4, this.FramesPerBlock, 16, mpeglayer3Data);
BitTools.ToHexHelper(4, this.CodecDelay, 20, mpeglayer3Data);
return(s + new string(mpeglayer3Data));
}
/// <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));
}
protected override void OpenMediaAsync()
{
var flvFile = new FlvFile(this.mediaStream);
this.audioSamples = flvFile.FlvFileBody.Tags.Where(tag => tag.TagType == TagType.Audio).ToList();
this.videoSamples = flvFile.FlvFileBody.Tags.Where(tag => tag.TagType == TagType.Video).ToList();
//Audio
WaveFormatExtensible wfx = new WaveFormatExtensible();
wfx.FormatTag = 0x00FF;
wfx.Channels = 2;
wfx.BlockAlign = 8;
wfx.BitsPerSample = 16;
wfx.SamplesPerSec = 44100;
wfx.AverageBytesPerSecond = wfx.SamplesPerSec * wfx.Channels * wfx.BitsPerSample / wfx.BlockAlign;
wfx.Size = 0;
string codecPrivateData = wfx.ToHexString();
Dictionary <MediaStreamAttributeKeys, string> audioStreamAttributes = new Dictionary <MediaStreamAttributeKeys, string>();
audioStreamAttributes[MediaStreamAttributeKeys.CodecPrivateData] = codecPrivateData;
this.audioStreamDescription = new MediaStreamDescription(MediaStreamType.Audio, audioStreamAttributes);
//Video
Dictionary <MediaStreamAttributeKeys, string> videoStreamAttributes = new Dictionary <MediaStreamAttributeKeys, string>();
videoStreamAttributes[MediaStreamAttributeKeys.VideoFourCC] = "H264";
this.videoStreamDescription = new MediaStreamDescription(MediaStreamType.Video, videoStreamAttributes);
//Media
Dictionary <MediaSourceAttributesKeys, string> mediaSourceAttributes = new Dictionary <MediaSourceAttributesKeys, string>();
mediaSourceAttributes[MediaSourceAttributesKeys.Duration] = audioSamples.Last().Timestamp.ToString(CultureInfo.InvariantCulture);
mediaSourceAttributes[MediaSourceAttributesKeys.CanSeek] = true.ToString();
List <MediaStreamDescription> mediaStreamDescriptions = new List <MediaStreamDescription>();
mediaStreamDescriptions.Add(this.audioStreamDescription);
mediaStreamDescriptions.Add(this.videoStreamDescription);
this.ReportOpenMediaCompleted(mediaSourceAttributes, mediaStreamDescriptions);
}
/// <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();
}
public void SetupTests()
{
this.wfx = new WaveFormatExtensible();
}
protected override void OpenMediaAsync()
{
// Initialize data structures to pass to the Media pipeline via the MediaStreamSource
Dictionary<MediaSourceAttributesKeys, string> mediaSourceAttributes = new Dictionary<MediaSourceAttributesKeys, string>();
Dictionary<MediaStreamAttributeKeys, string> mediaStreamAttributes = new Dictionary<MediaStreamAttributeKeys, string>();
List<MediaStreamDescription> mediaStreamDescriptions = new List<MediaStreamDescription>();
// Initialize the Mp3 data structures used by the Media pipeline with state from the first frame.
WaveFormatExtensible wfx = new WaveFormatExtensible();
wfx.FormatTag = 1; // PCM
wfx.Channels = 2;
wfx.SamplesPerSec = 44100;
wfx.AverageBytesPerSecond = 44100 * 2 * 2;
wfx.BlockAlign = 4;
wfx.BitsPerSample = 16;
wfx.Size = 0;
mediaStreamAttributes[MediaStreamAttributeKeys.CodecPrivateData] = wfx.ToHexString();
this.audioStreamDescription = new MediaStreamDescription(MediaStreamType.Audio, mediaStreamAttributes);
mediaStreamDescriptions.Add(this.audioStreamDescription);
// <note>This part is mere copy of Mp3MediaStreamSource:
// Setting a 0 duration to avoid the math to calcualte the Mp3 file length in minutes and seconds.
// This was done just to simplify this initial version of the code for other people reading it.
mediaSourceAttributes[MediaSourceAttributesKeys.Duration] = this.trackDuration.Ticks.ToString (CultureInfo.InvariantCulture);
mediaSourceAttributes[MediaSourceAttributesKeys.CanSeek] = true.ToString ();
// </note>
sample_enumerator = this.DecodeSamples ().GetEnumerator ();
this.ReportOpenMediaCompleted(mediaSourceAttributes, mediaStreamDescriptions);
}
