[x264-devel] access to reconstructed pixels

[Dennis Munsie]

I would like to be able to have access to the reconstructed pixels that x264
generates without having to write them out to a file.  Looking at the code,
it looks like I can use the fdec field in x264_t (the non opaque version) to
get access to these, as long as I force the deblocker to run.  Since this
isn't for production code, I don't mind doing this for now.  But would there
be any interest in a patch to provide a cleaner method of providing
reconstructed pixels?  I was thinking of something along the lines of using
the pic_out struct to provide the pixels for frame being returned.  You
would have to enable the feature in x264_param_t and provide a buffer in the
pic_out struct when you call x264_encoder_encode(). Something like this:

params.b_enable_recon = 1;

...

x264_picture_t pic_in, pic_out;
// skipping pic_in setup
pic_out.img.i_csp = X264_CSP_I420;
pic_out.img.i_plane = 3;
pic_out.img.plane[0] = yBuffer;
pic_out.img.plane[1] = uBuffer;
pic_out.img.plane[2] = vBuffer;
pic_out.img.i_stride[0] = width;
pic_out.img.i_stride[1] = width >> 1;
pic_out.img.i_stride[2] = width >> 1;
x264_encoder_encode(encoder, &nal_ptrs, &nals, &pic_in, &pic_out);

// iff nals were generated, then yBuffer/uBuffer/vBuffer would contain the
recon pixels

Would something like this be useful to anyone else?  If so, I can put
together a patch for submission.

-- 
dennis
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