0,0 → 1,92 |
/* |
* H261 common code |
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> |
* Copyright (c) 2004 Maarten Daniels |
* |
* 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 |
*/ |
|
/** |
* @file |
* h261codec. |
*/ |
|
#include "avcodec.h" |
#include "h261.h" |
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#define IS_FIL(a) ((a) & MB_TYPE_H261_FIL) |
|
uint8_t ff_h261_rl_table_store[2][2 * MAX_RUN + MAX_LEVEL + 3]; |
|
static void h261_loop_filter(uint8_t *src, int stride) |
{ |
int x, y, xy, yz; |
int temp[64]; |
|
for (x = 0; x < 8; x++) { |
temp[x] = 4 * src[x]; |
temp[x + 7 * 8] = 4 * src[x + 7 * stride]; |
} |
for (y = 1; y < 7; y++) { |
for (x = 0; x < 8; x++) { |
xy = y * stride + x; |
yz = y * 8 + x; |
temp[yz] = src[xy - stride] + 2 * src[xy] + src[xy + stride]; |
} |
} |
|
for (y = 0; y < 8; y++) { |
src[y * stride] = (temp[y * 8] + 2) >> 2; |
src[y * stride + 7] = (temp[y * 8 + 7] + 2) >> 2; |
for (x = 1; x < 7; x++) { |
xy = y * stride + x; |
yz = y * 8 + x; |
src[xy] = (temp[yz - 1] + 2 * temp[yz] + temp[yz + 1] + 8) >> 4; |
} |
} |
} |
|
void ff_h261_loop_filter(MpegEncContext *s) |
{ |
H261Context *h = (H261Context *)s; |
const int linesize = s->linesize; |
const int uvlinesize = s->uvlinesize; |
uint8_t *dest_y = s->dest[0]; |
uint8_t *dest_cb = s->dest[1]; |
uint8_t *dest_cr = s->dest[2]; |
|
if (!(IS_FIL(h->mtype))) |
return; |
|
h261_loop_filter(dest_y, linesize); |
h261_loop_filter(dest_y + 8, linesize); |
h261_loop_filter(dest_y + 8 * linesize, linesize); |
h261_loop_filter(dest_y + 8 * linesize + 8, linesize); |
h261_loop_filter(dest_cb, uvlinesize); |
h261_loop_filter(dest_cr, uvlinesize); |
} |
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av_cold void ff_h261_common_init(void) |
{ |
static int done = 0; |
|
if (done) |
return; |
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ff_init_rl(&ff_h261_rl_tcoeff, ff_h261_rl_table_store); |
done = 1; |
} |