c2140b8af1
Changes 'The VP8 project' to 'The WebM project', for consistency with other webmproject.org repositories. Fixes issue #97. Change-Id: I37c13ed5fbdb9d334ceef71c6350e9febed9bbba
117 lines
2.5 KiB
C
117 lines
2.5 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <math.h>
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void vp8_short_fdct4x4_c(short *input, short *output, int pitch)
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{
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int i;
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int a1, b1, c1, d1;
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short *ip = input;
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short *op = output;
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for (i = 0; i < 4; i++)
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{
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a1 = ((ip[0] + ip[3])<<3);
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b1 = ((ip[1] + ip[2])<<3);
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c1 = ((ip[1] - ip[2])<<3);
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d1 = ((ip[0] - ip[3])<<3);
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op[0] = a1 + b1;
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op[2] = a1 - b1;
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op[1] = (c1 * 2217 + d1 * 5352 + 14500)>>12;
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op[3] = (d1 * 2217 - c1 * 5352 + 7500)>>12;
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ip += pitch / 2;
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op += 4;
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}
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ip = output;
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op = output;
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for (i = 0; i < 4; i++)
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{
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a1 = ip[0] + ip[12];
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b1 = ip[4] + ip[8];
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c1 = ip[4] - ip[8];
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d1 = ip[0] - ip[12];
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op[0] = ( a1 + b1 + 7)>>4;
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op[8] = ( a1 - b1 + 7)>>4;
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op[4] =((c1 * 2217 + d1 * 5352 + 12000)>>16) + (d1!=0);
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op[12] = (d1 * 2217 - c1 * 5352 + 51000)>>16;
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ip++;
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op++;
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}
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}
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void vp8_short_fdct8x4_c(short *input, short *output, int pitch)
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{
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vp8_short_fdct4x4_c(input, output, pitch);
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vp8_short_fdct4x4_c(input + 4, output + 16, pitch);
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}
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void vp8_short_walsh4x4_c(short *input, short *output, int pitch)
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{
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int i;
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int a1, b1, c1, d1;
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int a2, b2, c2, d2;
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short *ip = input;
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short *op = output;
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for (i = 0; i < 4; i++)
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{
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a1 = ((ip[0] + ip[2])<<2);
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d1 = ((ip[1] + ip[3])<<2);
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c1 = ((ip[1] - ip[3])<<2);
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b1 = ((ip[0] - ip[2])<<2);
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op[0] = a1 + d1 + (a1!=0);
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op[1] = b1 + c1;
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op[2] = b1 - c1;
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op[3] = a1 - d1;
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ip += pitch / 2;
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op += 4;
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}
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ip = output;
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op = output;
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for (i = 0; i < 4; i++)
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{
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a1 = ip[0] + ip[8];
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d1 = ip[4] + ip[12];
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c1 = ip[4] - ip[12];
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b1 = ip[0] - ip[8];
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a2 = a1 + d1;
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b2 = b1 + c1;
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c2 = b1 - c1;
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d2 = a1 - d1;
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a2 += a2<0;
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b2 += b2<0;
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c2 += c2<0;
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d2 += d2<0;
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op[0] = (a2+3) >> 3;
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op[4] = (b2+3) >> 3;
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op[8] = (c2+3) >> 3;
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op[12]= (d2+3) >> 3;
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ip++;
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op++;
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}
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}
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