private static bool IsSuitableToMerge(FLVContext flvCtx1, FLVContext flvCtx2)
{
return((flvCtx1.soundFormat == flvCtx2.soundFormat) &&
(flvCtx1.soundRate == flvCtx2.soundRate) &&
(flvCtx1.soundSize == flvCtx2.soundSize) &&
(flvCtx1.soundType == flvCtx2.soundType) &&
(flvCtx1.videoCodecID == flvCtx2.videoCodecID));
}
private static FLVContext GetFLVFileInfo(FileStream fs)
{
bool hasAudioParams, hasVideoParams;
int skipSize, readLen;
int dataSize;
byte tagType;
byte[] tmp = new byte[FLV_TAG_HEADER_SIZE + 1];
if (fs == null)
{
return(null);
}
FLVContext flvCtx = new FLVContext();
fs.Position = 0;
skipSize = 9;
fs.Position += skipSize;
hasVideoParams = hasAudioParams = false;
skipSize = 4;
while (!hasVideoParams || !hasAudioParams)
{
fs.Position += skipSize;
if (FLV_TAG_HEADER_SIZE + 1 != fs.Read(tmp, 0, tmp.Length))
{
return(null);
}
tagType = (byte)(tmp[0] & 0x1f);
switch (tagType)
{
case 8:
flvCtx.soundFormat = (byte)((tmp[FLV_TAG_HEADER_SIZE] & 0xf0) >> 4);
flvCtx.soundRate = (byte)((tmp[FLV_TAG_HEADER_SIZE] & 0x0c) >> 2);
flvCtx.soundSize = (byte)((tmp[FLV_TAG_HEADER_SIZE] & 0x02) >> 1);
flvCtx.soundType = (byte)((tmp[FLV_TAG_HEADER_SIZE] & 0x01) >> 0);
hasAudioParams = true;
break;
case 9:
flvCtx.videoCodecID = (byte)((tmp[FLV_TAG_HEADER_SIZE] & 0x0f));
hasVideoParams = true;
break;
default:
break;
}
dataSize = FromInt24StringBe(tmp[1], tmp[2], tmp[3]);
skipSize = dataSize - 1 + 4;
}
return(flvCtx);
}
