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 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 static VideoStreamDescriptor CreateVideoDesc(this VideoTag tag)
{
VideoEncodingProperties encode = null;
if (tag.Codec == CodecID.H263)
{
encode = VideoEncodingProperties.CreateH264();
}
if (tag.Codec == CodecID.AVC)
{
encode = VideoEncodingProperties.CreateH264();
}
Debug.WriteLine("VideoDesc ## " + tag.Codec + " " + tag.Type);
return(new VideoStreamDescriptor(encode));
}
static Stream createVideoStream(this VideoTag tag, VideoTag FirstTag, bool hasHead)
{
byte[] startCode = new byte[] { 0, 0, 1 };
MemoryStream stream = new MemoryStream();
if (hasHead)
{
var mediaStream = FirstTag.GetDataStream();//.GetDataInputStream().AsStreamForRead();
BinaryReader binaryReader = new BinaryReader(mediaStream);
var configurationVersion = binaryReader.ReadByte();
var avcProfileIndication = binaryReader.ReadByte();
var avcCompatibleProfiles = binaryReader.ReadByte();
var avcLevelIndication = binaryReader.ReadByte();
byte lengthSizeMinusOne = binaryReader.ReadByte();
var naluLengthSize = (byte)(1 + (lengthSizeMinusOne & 3));
byte numOfSequenceParameterSets = (byte)(binaryReader.ReadByte() & 0x1f);
var sequenceParameters = new List <byte[]>(numOfSequenceParameterSets);
for (uint i = 0; i < numOfSequenceParameterSets; i++)
{
byte[] buffer = new byte[BytesToUInt16BE(binaryReader.ReadBytes(2))];
mediaStream.Read(buffer, 0, buffer.Length);
sequenceParameters.Add(buffer);
}
byte numOfPictureParameterSets = binaryReader.ReadByte();
var pictureParameters = new List <byte[]>(numOfPictureParameterSets);
for (uint i = 0; i < numOfPictureParameterSets; i++)
{
byte[] buffer = new byte[BytesToUInt16BE(binaryReader.ReadBytes(2))];
mediaStream.Read(buffer, 0, buffer.Length);
pictureParameters.Add(buffer);
}
var sps = sequenceParameters[0];
var pps = pictureParameters[0];
stream.Write(startCode, 0, startCode.Length);
stream.Write(sps, 0, sps.Length);
stream.Write(startCode, 0, startCode.Length);
stream.Write(pps, 0, pps.Length);
// .WriteLine(mediaStream.Position.ToString("X00")+"|"+String.Join(" ", stream.ToArray().Select((s)=> { return s.ToString("X00"); } ) ) );
//;
}
var tagStream = tag.GetDataStream(); //.GetDataInputStream().AsStreamForRead();
BinaryReader reader = new BinaryReader(tagStream);
var sampleSize = tagStream.Length; //sample.Count;//
while (sampleSize > 4L)
{
var ui32 = reader.ReadUInt32();
var count = OldSkool.swaplong(ui32);
stream.Write(startCode, 0, startCode.Length);
stream.Write(reader.ReadBytes((int)count), 0, (int)count);
sampleSize -= 4 + (uint)count;
}
stream.Position = 0;//非常 重要别删掉（返回的数据流必须从0开始播放
return(stream);
}
