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);
}
}
public FlvReader(Func <Stream> s)
{
this.CreateStream = s;
Stream stream = this.CreateStream(); // new HttpStream(url);
var Head = new FlvHead(stream); //9
if (Head.Signature != "FLV")
{
throw new Exception("格式错误:" + Head.Signature);
}
while (FirstAudio == null || FirstVideo == null || MediaData == null)
{
this.readPreviousTag(stream);
}
//加载keyframes
Task.Run(() => {
double nxf = 0;
double off = MediaData.Duration / 250;
var obj = MediaData["keyframes"]?.GetObject();
if (obj != null)
{
times = obj["times"].GetArray().Select((d) => d.GetNumber()).ToList();
kfs = obj["filepositions"].GetArray().Select((d) => (long)d.GetNumber()).ToList();
Debug.WriteLine("@@@ keyframes：ALL");
Debug.WriteLine("@@@ keyframes：ALL");
}
else
{
Debug.WriteLine("@@@ keyframes：LOADSTART");
while (true)
{
var PreviousTagSize = stream.ReadUInt32();
FlvTag flvTag = FlvTag.createTag(stream);
if (flvTag == null)
{
break;
}
var data = flvTag.LoadTagData(stream);
//关键帧
VideoTag tag = flvTag as VideoTag;
if (tag != null)
{
if (flvTag.TimeSpan.TotalSeconds >= nxf)
{
nxf += off;
times.Add(flvTag.TimeSpan.TotalSeconds);
kfs.Add(flvTag.Offset); //PreviousTagSize:4
}
}
}
Debug.WriteLine("@@@ keyframes：LOAdEND");
}
});
}
public bool readPreviousTag(Stream stream)
{
var p = stream.Position;
//Debug.WriteLine("readPreviousTag：{0}({0:X})+4+11=>{1}({1:X})", p,p+11+4);
var PreviousTagSize = stream.ReadUInt32(); //4 倒置读取位置
FlvTag flvTag = FlvTag.createTag(stream); //11 头部
if (flvTag == null)
{
return(false);
}
var data = flvTag.LoadTagData(stream);
//媒体数据
if (flvTag is ScriptDataTag)
{
MediaData = flvTag as ScriptDataTag;
return(true);
}
//音频头帧
if (flvTag is AudioTag)
{
var tag = flvTag as AudioTag;
if (FirstAudio == null)
{
FirstAudio = tag as AudioTag;
return(true);
}
AudioCache.Enqueue(tag);
}
//视频头帧
if (flvTag is VideoTag)
{
var tag = flvTag as VideoTag;
if (FirstVideo == null)
{
FirstVideo = flvTag as VideoTag;
return(true);
}
VideoCache.Enqueue(tag);
}
return(true);
}
