public static async Task <MediaStreamSample> CreateVideoSample(this VideoTag tag, VideoTag FirstTag, bool hasHead)
{
var stream = tag.createVideoStream(FirstTag, hasHead);// flv.createVideoStream(stream.AsStream(), vi);
var sample = await MediaStreamSample.CreateFromStreamAsync(
stream.AsInputStream(),
(uint)stream.Length,
tag.TimeSpan); //每一段的数据大小
//sample.Duration = tag.TimeSpan;//BUG
return(sample);
#region MyRegion
//Debug.WriteLine("CreateAudioSample：" + tag.Count + " " + tag.GetDataStream().Length);
//Debug.WriteLine(BitConverter.ToString( tag.GetDataInputStream().AsStreamForRead().ReadBytes(30) ));
/*
* var stream = tag.createVideoStream(Videos[0], vi <=2);
* var si = stream.AsInputStream();
* var sample = await MediaStreamSample.CreateFromStreamAsync(si, (uint)stream.Length, tag.TimeSpan);//每一段的数据大小
*/
#endregion
}
public static async Task <MediaStreamSample> CreateAudioSample(this AudioTag tag)
{
var stream = tag.GetDataStream();
var sample = await MediaStreamSample.CreateFromStreamAsync(
stream.AsInputStream(),
(uint)stream.Length,
tag.TimeSpan);//每一段的数据大小
//sample.Duration = tag.TimeSpan;//BUG
return(sample);
#region MyRegion
//Debug.WriteLine(tag.GetDataStream().toString(30));
//var ss = tag.GetDataInputStream();
//var sample = await MediaStreamSample.CreateFromStreamAsync(ss, tag.Count, tag.TimeSpan);//每一段的数据大小
//return sample;
/*
* var stream = tag.GetDataStream();//.GetDataStream().AsRandomAccessStream().GetInputStreamAt();
* var si = stream.AsInputStream();
* var sample = await MediaStreamSample.CreateFromStreamAsync(si, (uint)stream.Length, tag.TimeSpan);
*/
//stream.Position = (long)a.Offset;//问题的并发式或交错操作改变了对象的状态，无效此操作
//var ss = stream.AsInputStream(); //A concurrent or interleaved operation changed the state of the object, invalidating this operation. (Exception from HRESULT: 0x8000000C)
//var ss = stream.AsRandomAccessStream().GetInputStreamAt(a.Offset);//success
//var ss = stream.GetInputStreamAt(a.Offset);//success
//sample.Duration = a.TimeSpan - at; //每一段进度条移动距离
//sample.KeyFrame = true;
#endregion
}
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);
}
