public static AudioStreamDescriptor CreateAudioDesc(this AudioTag tag, ScriptDataTag MediaData)
{
//{"duration":6,"width":640,"height":360,"videodatarate":700,"framerate":30,"videocodecid":4,"audiodatarate":128,"audiodelay":0.038,"audiocodecid":2,"canSeekToEnd":true}
//{ "duration":30.093,"width":512,"height":288,
// "videodatarate":1019.6845703125,"framerate":99999.999999999985,
// "videocodecid":7,"audiodatarate":130.0380859375,"audiosamplerate":44100,"audiosamplesize":16,
// "stereo":true,"audiocodecid":10,"filesize":4460895 }
var m = MediaData;
var sampleRate = (uint)m["audiosamplerate"].GetNumber();
var channelCount = (uint)2;
var bitRate = (uint)m["audiodatarate"].GetNumber();
if (sampleRate < 10)
{
Debug.WriteLine("AudioDesc ERRORERRORERRORERRORERRORERROR sampleRate: " + sampleRate);
sampleRate = bitRate > 120U ? 22050U : 44100U;
}
AudioEncodingProperties encode = null;
if (tag.Codec == SoundFormat.AAC)
{
encode = AudioEncodingProperties.CreateAac(sampleRate, channelCount, bitRate);
}
if (tag.Codec == SoundFormat.MP3)
{
encode = AudioEncodingProperties.CreateMp3(sampleRate, channelCount, bitRate);
}
Debug.WriteLine("AudioDesc ## " + tag.Codec + " " + sampleRate + " " + channelCount + " " + bitRate);
return(new AudioStreamDescriptor(encode));
}
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
}
public FlvParse(Stream stream)
{
Head = new FlvHead(stream);
if (Head.Signature != "FLV")
{
throw new Exception("格式错误:" + Head.Signature);
}
while (true)
{
var PreviousTagSize = stream.ReadUInt32();
FlvTag flvTag = FlvTag.createTag(stream);
if (flvTag == null)
{
break;
}
var data = flvTag.LoadTagData(stream);
VideoTag v = flvTag as VideoTag;
if (v != null)
{
Videos.Add(v);
}
AudioTag a = flvTag as AudioTag;
if (a != null)
{
Audios.Add(a);
}
ScriptDataTag d = flvTag as ScriptDataTag;
if (d != null)
{
MediaData = d;
}
tags.Add(flvTag);
}
}
