[x264-devel] Re: parallising the encoder

[Tom Jacobs]

thanks for all the info everyone, much appreciated.

the rest of this is probably just aimed at champ yen since it is his code i
am 'playing' with.

i am modifing it so that instead of using pthreads i can run it on my SoC
multi-processor simulator. the main loop that i need to thread is the one
containing slice_encode_thread. i am guessing that the use of
thread_data[i] was because of only being able to pass one argument with
pthread_create.
of these are h i_nal_type i_slice_type i_nal_ref_idc i_global_qp going to be
the same value for all the threads? with only the slice number, i, being
different?

so far i have got this kind of arrangemt as i have undone the loop for a
2slice encode:

if (processor ==0) {
 thread_data[0].h = h;
 thread_data[0].i_nal_type = i_nal_type;
 thread_data[0].i_slice_type = i_slice_type;
 thread_data[0].i_slice_id = 0;
 thread_data[0].i_nal_ref_idc = i_nal_ref_idc;
 thread_data[0].i_global_qp = i_global_qp;
 rc = slice_encode_thread(&thread_data[0]);
}

if (processor==1) {
 thread_data[1].h = h;
 thread_data[1].i_nal_type = i_nal_type;
 thread_data[1].i_slice_type = i_slice_type;
 thread_data[1].i_slice_id = 1;
 thread_data[1].i_nal_ref_idc = i_nal_ref_idc;
 thread_data[1].i_global_qp = i_global_qp;
 rc = slice_encode_thread(&thread_data[1]);
}

is this how the threaded program should work?  all processor executing
slice_encode_thread at the sametime.

thanks for your help

Tom

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