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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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#include <stdint.h> |
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#include "libavutil/attributes.h" |
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#include "libavutil/common.h" |
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#include "config.h" |
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#include "h263dsp.h" |
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const uint8_t ff_h263_loop_filter_strength[32] = { |
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0, 1, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 6, 6, 7, 7, |
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7, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12, 12 |
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}; |
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static void h263_h_loop_filter_c(uint8_t *src, int stride, int qscale) |
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{ |
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int y; |
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const int strength = ff_h263_loop_filter_strength[qscale]; |
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✓✓ |
10325070 |
for (y = 0; y < 8; y++) { |
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int d1, d2, ad1; |
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9177840 |
int p0 = src[y * stride - 2]; |
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9177840 |
int p1 = src[y * stride - 1]; |
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9177840 |
int p2 = src[y * stride + 0]; |
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9177840 |
int p3 = src[y * stride + 1]; |
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9177840 |
int d = (p0 - p3 + 4 * (p2 - p1)) / 8; |
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✓✓ |
9177840 |
if (d < -2 * strength) |
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d1 = 0; |
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✓✓ |
8985479 |
else if (d < -strength) |
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d1 = -2 * strength - d; |
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✓✓ |
8735844 |
else if (d < strength) |
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d1 = d; |
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✓✓ |
644763 |
else if (d < 2 * strength) |
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d1 = 2 * strength - d; |
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else |
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d1 = 0; |
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9177840 |
p1 += d1; |
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9177840 |
p2 -= d1; |
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✓✓ |
9177840 |
if (p1 & 256) |
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p1 = ~(p1 >> 31); |
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✓✓ |
9177840 |
if (p2 & 256) |
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p2 = ~(p2 >> 31); |
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9177840 |
src[y * stride - 1] = p1; |
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9177840 |
src[y * stride + 0] = p2; |
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9177840 |
ad1 = FFABS(d1) >> 1; |
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d2 = av_clip((p0 - p3) / 4, -ad1, ad1); |
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src[y * stride - 2] = p0 - d2; |
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src[y * stride + 1] = p3 + d2; |
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} |
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1147230 |
} |
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static void h263_v_loop_filter_c(uint8_t *src, int stride, int qscale) |
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{ |
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int x; |
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const int strength = ff_h263_loop_filter_strength[qscale]; |
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✓✓ |
10436562 |
for (x = 0; x < 8; x++) { |
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int d1, d2, ad1; |
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int p0 = src[x - 2 * stride]; |
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int p1 = src[x - 1 * stride]; |
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int p2 = src[x + 0 * stride]; |
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int p3 = src[x + 1 * stride]; |
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int d = (p0 - p3 + 4 * (p2 - p1)) / 8; |
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✓✓ |
9276944 |
if (d < -2 * strength) |
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d1 = 0; |
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✓✓ |
9033296 |
else if (d < -strength) |
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252530 |
d1 = -2 * strength - d; |
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✓✓ |
8780766 |
else if (d < strength) |
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d1 = d; |
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✓✓ |
737627 |
else if (d < 2 * strength) |
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d1 = 2 * strength - d; |
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else |
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d1 = 0; |
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p1 += d1; |
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p2 -= d1; |
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✓✓ |
9276944 |
if (p1 & 256) |
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p1 = ~(p1 >> 31); |
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✓✓ |
9276944 |
if (p2 & 256) |
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p2 = ~(p2 >> 31); |
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src[x - 1 * stride] = p1; |
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src[x + 0 * stride] = p2; |
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ad1 = FFABS(d1) >> 1; |
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d2 = av_clip((p0 - p3) / 4, -ad1, ad1); |
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src[x - 2 * stride] = p0 - d2; |
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src[x + stride] = p3 + d2; |
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} |
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1159618 |
} |
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av_cold void ff_h263dsp_init(H263DSPContext *ctx) |
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{ |
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ctx->h263_h_loop_filter = h263_h_loop_filter_c; |
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ctx->h263_v_loop_filter = h263_v_loop_filter_c; |
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if (ARCH_X86) |
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ff_h263dsp_init_x86(ctx); |
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if (ARCH_MIPS) |
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ff_h263dsp_init_mips(ctx); |
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} |