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libavcodec/h264dspenc.c

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00001 /*
00002  * H.264/MPEG-4 Part 10 (Base profile) encoder.
00003  *
00004  * DSP functions
00005  *
00006  * Copyright (c) 2006 Expertisecentrum Digitale Media, UHasselt
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00029 #include "dsputil.h"
00030 
00031 #define  H264_DCT_PART1(X) \
00032          a = block[0][X]+block[3][X]; \
00033          c = block[0][X]-block[3][X]; \
00034          b = block[1][X]+block[2][X]; \
00035          d = block[1][X]-block[2][X]; \
00036          pieces[0][X] = a+b; \
00037          pieces[2][X] = a-b; \
00038          pieces[1][X] = (c<<1)+d; \
00039          pieces[3][X] = c-(d<<1);
00040 
00041 #define  H264_DCT_PART2(X) \
00042          a = pieces[X][0]+pieces[X][3]; \
00043          c = pieces[X][0]-pieces[X][3]; \
00044          b = pieces[X][1]+pieces[X][2]; \
00045          d = pieces[X][1]-pieces[X][2]; \
00046          block[0][X] = a+b; \
00047          block[2][X] = a-b; \
00048          block[1][X] = (c<<1)+d; \
00049          block[3][X] = c-(d<<1);
00050 
00059 static void h264_dct_c(DCTELEM block[4][4])
00060 {
00061     DCTELEM pieces[4][4];
00062     DCTELEM a, b, c, d;
00063 
00064     H264_DCT_PART1(0);
00065     H264_DCT_PART1(1);
00066     H264_DCT_PART1(2);
00067     H264_DCT_PART1(3);
00068     H264_DCT_PART2(0);
00069     H264_DCT_PART2(1);
00070     H264_DCT_PART2(2);
00071     H264_DCT_PART2(3);
00072 }
00073 
00074 av_cold void ff_h264dspenc_init(DSPContext* c, AVCodecContext *avctx)
00075 {
00076     c->h264_dct = h264_dct_c;
00077 }
00078 

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