How to use a Servlet to do HTTP streaming?

Hello, everyone!
I want to use a servlet to do simple HTTP streaming, just like what Apache is doing now. I just want the basic functions of HTTP streaming. I want the Servlet works like this, reads data from a local media file and sends through HTTP to client player to do streaming.
Where can I find some sample source codes?
Best regards,
George

Can anyone help?
George

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int ival;
T oval;
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volatile ap_uint<1> last = e.last;
volatile ap_uint<TI> id = e.id;
volatile ap_uint<TD> dest = e.dest;
return ret;
template<typename T, int U, int TI, int TD>
inline ap_axiu<sizeof(T) * 8, U, TI, TD> push_stream(T const &v, bool last =
false) {
#pragma HLS INLINE off
ap_axiu<sizeof(T) * 8, U, TI, TD> e;
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union {
int oval;
T ival;
} converter;
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e.strb = -1;
e.keep = 15; //e.strb;
e.user = 0;
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e.dest = 0;
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void detectTest(AXI_VAL INPUT_STREAM[HEIGHT * WIDTH], AXI_VAL RESULT_STREAM[HEIGHT * WIDTH]) {
#pragma HLS INTERFACE ap_fifo port=RESULT_STREAM
#pragma HLS INTERFACE ap_fifo port=INPUT_STREAM
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#pragma HLS RESOURCE variable=INPUT_STREAM core=AXI4Stream metadata="-bus_bundle INPUT_STREAM"
#pragma HLS RESOURCE variable=return core=AXI4LiteS metadata="-bus_bundle CONTROL_STREAM"
int i, j;
for (i = 0; i < HEIGHT * WIDTH; i++) {
unsigned int instream_value = pop_stream<unsigned int, 1, 1, 1>(INPUT_STREAM[i]);
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*(pixel_in.val) = (unsigned char) instream_value;
mframe << pixel_in;
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mframe >> pixel_out;
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#pragma HLS RESOURCE variable=INPUT_STREAM core=AXI4Stream metadata="-bus_bundle INPUT_STREAM"
#pragma HLS RESOURCE variable=return core=AXI4LiteS metadata="-bus_bundle CONTROL_STREAM"
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for (i = 0; i < HEIGHT * WIDTH; i++) {//receiving block
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mframe << pixel_in;
hls::Resize(mframe, mframe_resize);
hls::Resize(mframe_resize, mframe);
for (i = 0; i < HEIGHT * WIDTH; i++) {//transmitting block
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mframe>>pixel_out;
unsigned char outstream_value=*(pixel_out.val);
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return;
I also tried to delete or modify the following 2 lines in the modified IP core. But the transmitting problem existed too. It seems that the IP core cannot work normally if the receiving block and the transmitting block in different "for" loops. But if I did not solve this problem, the image processing functions cannot be added into the IP core either. The document of xapp1167 mentioned that " the hls::Mat<> datatype used to model images is internally defined as a stream of pixels". Does that caused the problem? And how can I solve this problem? Thanks a lot !
hls::Resize(mframe, mframe_resize);
hls::Resize(mframe_resize, mframe);

Hello
So the major concept that you need to learn/remember is that hls::Mat<> is basically "only" an hls stream -- hls::stream<> -- It's actually an array of N channels (and you have N=1).
Next, streams are fifos; in software that's modeled as infinite queues but in HW they have finite size.
The default value is a depth of 2 (IIRC)
in your first code you do :
for all pixels loop {
.. something to read pixel_in
   mframe takes pixel_in
   pixel_out is read from mframe
   .. wirte out pixel_out
} // end loop
If you notice, mframe has never more than one pixel element inside since as soon as you write to it, you unload it. in other terms mframe never contains a full frame of pixel (but a full frame flow through it!).
In your second coding, mframe has to actually contain all the pixels as you have 2 for loops and you don't start unloading the pixels unless you have the first loop complete.
Needless to say that your fifo had a depth of 2 so actually you never read more than 3 pixels in.
That's why you see that the ready signal of the iput stream drops after a few pixels; that's the back pressure being applied by the VHLS block.
Where to go from there?
Well first stop doing FPGA tests and chipscope if you did not run cosim first and that it passed.
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Check UG902 about cosim and self checking testbench. maybe for video you can't have selfchecking so at least you need to have visual checks of generated pictures - you can adapt XAPP1167 for that.
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If you check carefully the XAPP, the design operates in "dataflow" mode; check UG902 as to what this means.
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Well I leave you to read more.
I hope this helps....

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hi john,
nice to see you here ;)
in this blog. i read out the how to use for update no wait.
http://radio-weblogs.com/0118231/stories/2004/03/24/whyDoIGetOraclejborowinconsistentexception.html
ok. my question is :
am unable to use the for update no wait statement in query as like as they said.?
I'll not comment about the use of pessimistic locking like this in a web-based app.ok. am not use pessimistic locking.
(although I have just implied that there could be some issues - ADF is not Forms).
ADF is not Forms.
from this what i understood means.
some issues - ADF technology
not in forms technology. are you mean like this. is it so?
http://jdeveloperfaq.blogspot.com/2010/02/faq-12-how-to-disable-query-wrapping.html could help you
how does helps me.
this blogs deals something about advanced stuff operator (union,unionall...)
i cant your undertud the previous post fully.
sorry for misunderstanding from your post..
Edited by: ADF 7 on Jan 30, 2012 12:16 AM

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