c2140b8af1
Changes 'The VP8 project' to 'The WebM project', for consistency with other webmproject.org repositories. Fixes issue #97. Change-Id: I37c13ed5fbdb9d334ceef71c6350e9febed9bbba
118 lines
2.9 KiB
C
118 lines
2.9 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 "vpx_scale/yv12config.h"
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#include "math.h"
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#include "systemdependent.h" /* for vp8_clear_system_state() */
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#define MAX_PSNR 60
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double vp8_mse2psnr(double Samples, double Peak, double Mse)
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{
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double psnr;
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if ((double)Mse > 0.0)
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psnr = 10.0 * log10(Peak * Peak * Samples / Mse);
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else
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psnr = MAX_PSNR; // Limit to prevent / 0
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if (psnr > MAX_PSNR)
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psnr = MAX_PSNR;
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return psnr;
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}
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double vp8_calc_psnr(YV12_BUFFER_CONFIG *source, YV12_BUFFER_CONFIG *dest, double *YPsnr, double *UPsnr, double *VPsnr, double *sq_error)
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{
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int i, j;
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int Diff;
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double frame_psnr;
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double Total;
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double grand_total;
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unsigned char *src = source->y_buffer;
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unsigned char *dst = dest->y_buffer;
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Total = 0.0;
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grand_total = 0.0;
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// Loop throught the Y plane raw and reconstruction data summing (square differences)
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for (i = 0; i < source->y_height; i++)
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{
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for (j = 0; j < source->y_width; j++)
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{
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Diff = (int)(src[j]) - (int)(dst[j]);
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Total += Diff * Diff;
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}
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src += source->y_stride;
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dst += dest->y_stride;
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}
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// Work out Y PSNR
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*YPsnr = vp8_mse2psnr(source->y_height * source->y_width, 255.0, Total);
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grand_total += Total;
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Total = 0;
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// Loop through the U plane
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src = source->u_buffer;
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dst = dest->u_buffer;
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for (i = 0; i < source->uv_height; i++)
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{
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for (j = 0; j < source->uv_width; j++)
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{
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Diff = (int)(src[j]) - (int)(dst[j]);
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Total += Diff * Diff;
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}
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src += source->uv_stride;
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dst += dest->uv_stride;
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}
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// Work out U PSNR
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*UPsnr = vp8_mse2psnr(source->uv_height * source->uv_width, 255.0, Total);
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grand_total += Total;
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Total = 0;
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// V PSNR
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src = source->v_buffer;
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dst = dest->v_buffer;
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for (i = 0; i < source->uv_height; i++)
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{
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for (j = 0; j < source->uv_width; j++)
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{
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Diff = (int)(src[j]) - (int)(dst[j]);
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Total += Diff * Diff;
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}
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src += source->uv_stride;
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dst += dest->uv_stride;
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}
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// Work out UV PSNR
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*VPsnr = vp8_mse2psnr(source->uv_height * source->uv_width, 255.0, Total);
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grand_total += Total;
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Total = 0;
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// Work out total PSNR
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frame_psnr = vp8_mse2psnr(source->y_height * source->y_width * 3 / 2 , 255.0, grand_total);
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*sq_error = 1.0 * grand_total;
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return frame_psnr;
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}
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