写一个 Push Mode 的 Source Filter

[davidwee]

Hi all,

The problem of mine is to write a source filter what works in push mode.
The source filter read the UDP packets(contain some MPEG-II TS data) from
localhost's port and "push" those to downstream filter(typically a De-Mux
filter).

I think there will contain the following classes:

1. CNetReader, read UDP packets from localhost port;
2. CMySource, derive from CSource;
3. CMyStream, derive from CSourceStream.

And how do I implement those classes? If I should manage a buffer array?
If I should manage the time reference? And how do I set the MediaType?
In addition, I use this source filter just for MPEG-II TS play.

Thanks a lot in advance.

[davidwee]

没有人做这个东西吗?

[davidwee]

看来真的没人做这个东西了

[davidwee]

我自己推，唉

[capboy]

恩?
ball的例子不够详细么?他的模式和你的一样阿..
Class CBall自己写.
class CBallStream : public CSourceStream
class CBouncingBall : public CSource
有什么不好用的地方么?

[capboy]

And how do I implement those classes?
参考ball
If I should manage a buffer array?
需要自己做
If I should manage the time reference?
不需要吧.你只是source,不是decoder,你只是不需要破坏数据就可以了:)
And how do I set the MediaType?
MEDIATYPE_Stream, MEDIASUBTYPE_MPEG2_TRANSPORT, Format_None

[richardlf]

谁能提供一个例子么？或者，有谁已经通过改进ball例子程序实现了自己的推模式的源过滤器么？成功，还是失败？

[davidwee]

我照抄，然后作了一些修改（CBall改为什么也不做，MediaType改为如上capboy所述），但往GraphEdit中加时出错。

用MessageBox追踪，走了如下几步：
CZQSource::CreateInstance
CZQSource::CZQSource
CNetReader::CNetReader
CZQStream::CZQStream
然后：
X The instruction at "XXXXX" referenced memory at "XXXXX". The memory could not be "read".
...

[davidlxm]

davidwee
SourceFilter我回家也做过了，完全可以加入到GraphEdit中，你换台机器试试看，COM/OLE View 中ZQSourceFilter.ax 变成了 regsvr32.exe，说明在COM中就存在了问题（可能是编译选项），如果那也不行，告诉我，我把我做源码的给你。

[richardlf]

davidixm，能不能也给我一份源码么，如果可以的话，真是万分感谢！！！
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