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/* |
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* H.261 common code |
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> |
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* Copyright (c) 2004 Maarten Daniels |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* H.261 codec |
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*/ |
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#include "h261.h" |
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#include "mpegvideo.h" |
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#define IS_FIL(a) ((a) & MB_TYPE_H261_FIL) |
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static void h261_loop_filter(uint8_t *src, int stride) |
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{ |
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int x, y, xy, yz; |
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int temp[64]; |
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for (x = 0; x < 8; x++) { |
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temp[x] = 4 * src[x]; |
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temp[x + 7 * 8] = 4 * src[x + 7 * stride]; |
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} |
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for (y = 1; y < 7; y++) { |
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for (x = 0; x < 8; x++) { |
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xy = y * stride + x; |
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yz = y * 8 + x; |
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temp[yz] = src[xy - stride] + 2 * src[xy] + src[xy + stride]; |
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} |
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} |
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for (y = 0; y < 8; y++) { |
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src[y * stride] = (temp[y * 8] + 2) >> 2; |
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src[y * stride + 7] = (temp[y * 8 + 7] + 2) >> 2; |
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for (x = 1; x < 7; x++) { |
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xy = y * stride + x; |
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yz = y * 8 + x; |
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src[xy] = (temp[yz - 1] + 2 * temp[yz] + temp[yz + 1] + 8) >> 4; |
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} |
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} |
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} |
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void ff_h261_loop_filter(MpegEncContext *s) |
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{ |
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H261Context *h = (H261Context *)s; |
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const int linesize = s->linesize; |
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const int uvlinesize = s->uvlinesize; |
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uint8_t *dest_y = s->dest[0]; |
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uint8_t *dest_cb = s->dest[1]; |
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uint8_t *dest_cr = s->dest[2]; |
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if (!(IS_FIL(h->mtype))) |
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return; |
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h261_loop_filter(dest_y, linesize); |
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h261_loop_filter(dest_y + 8, linesize); |
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h261_loop_filter(dest_y + 8 * linesize, linesize); |
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h261_loop_filter(dest_y + 8 * linesize + 8, linesize); |
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h261_loop_filter(dest_cb, uvlinesize); |
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h261_loop_filter(dest_cr, uvlinesize); |
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} |
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