async void MSS_Starting(Windows.Media.Core.MediaStreamSource sender, MediaStreamSourceStartingEventArgs args)
{
MediaStreamSourceStartingRequest request = args.Request;
if ((request.StartPosition != null) && request.StartPosition.Value <= MSS.Duration)
{
UInt64 sampleOffset = (UInt64)request.StartPosition.Value.Ticks / (UInt64)sampleDuration.Ticks;
timeOffset = new TimeSpan((long)sampleOffset * sampleDuration.Ticks);
byteOffset = sampleOffset * sampleSize;
}
// create the RandomAccessStream for the input file for the first time
if (mssStream == null)
{
MediaStreamSourceStartingRequestDeferral deferal = request.GetDeferral();
try
{
mssStream = await inputMP3File.OpenAsync(FileAccessMode.Read);
request.SetActualStartPosition(timeOffset);
deferal.Complete();
}
catch (Exception)
{
MSS.NotifyError(MediaStreamSourceErrorStatus.FailedToOpenFile);
deferal.Complete();
}
}
else
{
request.SetActualStartPosition(timeOffset);
}
}
public void Start(MediaStreamSourceStartingRequest request)
{
lock ( m_lock )
{
Debug.Assert(m_state == State.Created);
m_startRequest = request;
m_startRequestCompletion = request.GetDeferral();
m_state = State.Started;
m_session.StartCapture();
}
}
void mkvStreamSource_Starting(MediaStreamSource sender, MediaStreamSourceStartingEventArgs args)
{
MediaStreamSourceStartingRequest request = args.Request;
if (request.StartPosition.HasValue && sender.CanSeek)
{
var deferal = request.GetDeferral();
var mkvFs = mediaStreamFileSource as CCPlayer.HWCodecs.Matroska.MKV.MKVFileSource;
if (mkvFs != null)
{
var newTime = mkvFs.Seek((ulong)request.StartPosition.Value.Ticks / 10000);
request.SetActualStartPosition(newTime);
}
deferal.Complete();
}
}
private void flvStreamSource_Starting(MediaStreamSource sender, MediaStreamSourceStartingEventArgs args)
{
MediaStreamSourceStartingRequest request = args.Request;
if (request.StartPosition.HasValue && sender.CanSeek)
{
var deferal = request.GetDeferral();
var flvFile = mediaStreamFileSource as FlvFile;
if (flvFile != null)
{
var newTime = SeekForFlv(flvFile, (long)(request.StartPosition.Value.TotalMilliseconds * 10000));
request.SetActualStartPosition(TimeSpan.FromTicks(newTime));
}
deferal.Complete();
}
}
async Task <MediaStreamSource> createMediaStream2(string url = "ms-appx:///Assets/test.mp3")
{
var file = await Windows.Storage.StorageFile.GetFileFromApplicationUriAsync(new Uri(url));
var stream = await file.OpenReadAsync();
MusicProperties mp3FileProperties = await file.Properties.GetMusicPropertiesAsync();
List <string> encodingPropertiesToRetrieve = new List <string>();
encodingPropertiesToRetrieve.Add("System.Audio.SampleRate");
encodingPropertiesToRetrieve.Add("System.Audio.ChannelCount");
encodingPropertiesToRetrieve.Add("System.Audio.EncodingBitrate");
var encodingProperties = await file.Properties.RetrievePropertiesAsync(encodingPropertiesToRetrieve);
uint sampleRate = (uint)encodingProperties["System.Audio.SampleRate"];
uint channelCount = (uint)encodingProperties["System.Audio.ChannelCount"];
uint bitRate = (uint)encodingProperties["System.Audio.EncodingBitrate"];
/*
* 44100 2 128000
* 44100 2 171896 music: 00:03:33.2114285
* 44100 2 130000 music: 00:00:30.0930000
* SampleRate/SamplesPerSec
* Stereo/Channels
* SR*SO*SS/BA
*
* 130.3 16 2
* DataRate
* SampleSize/BitsPerSample
* BlockAlign
*/
// var audiodesc = new AudioStreamDescriptor(AudioEncodingProperties.CreateMp3(44100, 2, 128000));
var audiodesc = new AudioStreamDescriptor(AudioEncodingProperties.CreateMp3(sampleRate, channelCount, bitRate));
var c = new MediaStreamSource(audiodesc);
c.Duration = mp3FileProperties.Duration;
c.CanSeek = true;
Debug.WriteLine("music: " + c.Duration);
Debug.WriteLine(mp3FileProperties.Title + " " + sampleRate + " " + channelCount + " " + bitRate);
UInt32 sampleSize = 300; //每一段
TimeSpan sampleDuration = new TimeSpan(0, 0, 0, 0, 70); //每一段进度条移动距离
ulong byteOffset = 0;
TimeSpan timeOffset = new TimeSpan(0);
c.Starting += (s, e) => {
Debug.WriteLine("==Starting==");
MediaStreamSourceStartingRequest request = e.Request;
if ((request.StartPosition != null) && request.StartPosition.Value <= c.Duration)
{
UInt64 sampleOffset = (UInt64)request.StartPosition.Value.Ticks / (UInt64)sampleDuration.Ticks;
timeOffset = new TimeSpan((long)sampleOffset * sampleDuration.Ticks);
byteOffset = sampleOffset * sampleSize;
}
request.SetActualStartPosition(timeOffset);
};
c.SampleRequested += async(s, e) => {
//Debug.WriteLine(timeOffset);
var deferal = e.Request.GetDeferral();
if (byteOffset + sampleSize <= stream.Size)
{
Debug.WriteLine(sampleSize + " " + timeOffset);
var sample = await MediaStreamSample.CreateFromStreamAsync(stream.GetInputStreamAt(byteOffset), sampleSize, timeOffset); //每一段的数据大小
sample.Duration = sampleDuration; //每一段进度条移动距离
sample.KeyFrame = true;
e.Request.Sample = sample;
byteOffset += sampleSize;
timeOffset = timeOffset.Add(sampleDuration);
}
deferal.Complete();
};
return(c);
}
