From ddcf4b5d6d19fcbf4cb632a7d9a9be4ac9e6738f Mon Sep 17 00:00:00 2001 From: Vitor Sessak Date: Mon, 4 Jun 2007 07:28:34 +0000 Subject: Codebook generator using the ELBG algorithm patch by Vitor: printf(vitor%d gmail com, 1001) original thread: Re: [FFmpeg-devel] [PATCH] Add a codebook generator (was: [PATCH] RoQ video encoder, take 2) date: 05/28/2007 01:21 PM Originally committed as revision 9196 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/elbg.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 libavcodec/elbg.h (limited to 'libavcodec/elbg.h') diff --git a/libavcodec/elbg.h b/libavcodec/elbg.h new file mode 100644 index 0000000000..ab711b5b7c --- /dev/null +++ b/libavcodec/elbg.h @@ -0,0 +1,50 @@ +/* + * Copyright (C) 2007 Vitor + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "random.h" + +/** + * Implementation of the Enhanced LBG Algorithm + * Based on the paper "Neural Networks 14:1219-1237" that can be found in + * http://citeseer.ist.psu.edu/patan01enhanced.html . + * + * @param points Input points. + * @param dim Dimension of the points. + * @param numpoints Num of points in **points. + * @param codebook Pointer to the output codebook. Must be allocated. + * @param numCB Number of points in the codebook. + * @param num_steps The maximum number of steps. One step is already a good compromise between time and quality. + * @param closest_cb Return the closest codebook to each point. Must be allocated. + * @param rand_state A random number generator state. Should be already initialised by av_init_random. + */ +void ff_do_elbg(int *points, int dim, int numpoints, int *codebook, + int numCB, int num_steps, int *closest_cb, + AVRandomState *rand_state); + +/** + * Initialize the **codebook vector for the elbg algorithm. If you have already + * a codebook and you want to refine it, you shouldn't call this function. + * If numpoints < 8*numCB this function fills **codebook with random numbers. + * If not, it calls ff_do_elbg for a (smaller) random sample of the points in + * **points. Get the same parameters as ff_do_elbg. + */ +void ff_init_elbg(int *points, int dim, int numpoints, int *codebook, + int numCB, int num_steps, int *closest_cb, + AVRandomState *rand_state); -- cgit v1.2.3