/// <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));
}
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);
}
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);
}