Hi!
For some reasons I need to implement universal avio proxy, which will
support all ffmpeg protocols.
The main goal is to parse all avio_read traffic via some custom function.
So, I create custom context with direct i/o:
AVIOContext* _ffmpeg_io_context = avio_alloc_context(NULL, 0,
0, // writeflag
this, //context (opaque)
readFunctionWrapper, //read
NULL , //write
seekFunctionWrapper );//seek
_ffmpeg_io_context->direct = true;
After I open the original avio:
AVIOContext* _origAvio = NULL;
avio_open2(&_origAvio, _url.c_str(), AVIO_FLAG_READ, NULL, NULL);
_ffmpeg_io_context->seekable = _origAvio->seekable; /// Set to
custom avio seekable flags from the original avio
My custom functions looks like this:
int FFmpegIoProxy::readFunction(uint8_t* buf, int buf_size){
int res = avio_read(_origAvio, buf, buf_size);
if (res>0){
... do something with buf
}
return buf;
}
int64_t FFmpegIoProxy::seekFunction(int64_t offset, int whence){
return avio_seek(_origAvio, offset, whence);
}
After I open avformat with custom i/o:
_ffmpeg_format_context = avformat_alloc_context();
_ffmpeg_format_context->pb= _ffmpeg_io_context;
avformat_open_input(&_ffmpeg_format_context, NULL, NULL, NULL);
Local (file://) url works fine, but when I try to open http:// protocol
I see messages:
[http @ 0x4b97c0] HTTP error 416 Requested Range Not Satisfiable
So, really it requesting out-of range data.
Is somebody knows, what is wrong? May be I need to set some more fields
of my proxy avio?
--
With best regards, Pavel A. Sokolov
mobile: +7(921)419-1819
skype: pavel_a_sokolov
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