ref: 7b742da63e4b829ba013670dd838d263f5df8956
dir: /tools/tiny_ssim.c/
/* * Copyright (c) 2016 The WebM project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE file in the root of the source * tree. An additional intellectual property rights grant can be found * in the file PATENTS. All contributing project authors may * be found in the AUTHORS file in the root of the source tree. */ #include <errno.h> #include <math.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include "vpx/vpx_codec.h" #include "vpx/vpx_integer.h" #include "./y4minput.h" void vp8_ssim_parms_8x8_c(unsigned char *s, int sp, unsigned char *r, int rp, uint32_t *sum_s, uint32_t *sum_r, uint32_t *sum_sq_s, uint32_t *sum_sq_r, uint32_t *sum_sxr) { int i, j; for (i = 0; i < 8; i++, s += sp, r += rp) { for (j = 0; j < 8; j++) { *sum_s += s[j]; *sum_r += r[j]; *sum_sq_s += s[j] * s[j]; *sum_sq_r += r[j] * r[j]; *sum_sxr += s[j] * r[j]; } } } static const int64_t cc1 = 26634; // (64^2*(.01*255)^2 static const int64_t cc2 = 239708; // (64^2*(.03*255)^2 static double similarity(uint32_t sum_s, uint32_t sum_r, uint32_t sum_sq_s, uint32_t sum_sq_r, uint32_t sum_sxr, int count) { int64_t ssim_n, ssim_d; int64_t c1, c2; // scale the constants by number of pixels c1 = (cc1 * count * count) >> 12; c2 = (cc2 * count * count) >> 12; ssim_n = (2 * sum_s * sum_r + c1) * ((int64_t)2 * count * sum_sxr - (int64_t)2 * sum_s * sum_r + c2); ssim_d = (sum_s * sum_s + sum_r * sum_r + c1) * ((int64_t)count * sum_sq_s - (int64_t)sum_s * sum_s + (int64_t)count * sum_sq_r - (int64_t)sum_r * sum_r + c2); return ssim_n * 1.0 / ssim_d; } static double ssim_8x8(unsigned char *s, int sp, unsigned char *r, int rp) { uint32_t sum_s = 0, sum_r = 0, sum_sq_s = 0, sum_sq_r = 0, sum_sxr = 0; vp8_ssim_parms_8x8_c(s, sp, r, rp, &sum_s, &sum_r, &sum_sq_s, &sum_sq_r, &sum_sxr); return similarity(sum_s, sum_r, sum_sq_s, sum_sq_r, sum_sxr, 64); } // We are using a 8x8 moving window with starting location of each 8x8 window // on the 4x4 pixel grid. Such arrangement allows the windows to overlap // block boundaries to penalize blocking artifacts. double vp8_ssim2(unsigned char *img1, unsigned char *img2, int stride_img1, int stride_img2, int width, int height) { int i, j; int samples = 0; double ssim_total = 0; // sample point start with each 4x4 location for (i = 0; i <= height - 8; i += 4, img1 += stride_img1 * 4, img2 += stride_img2 * 4) { for (j = 0; j <= width - 8; j += 4) { double v = ssim_8x8(img1 + j, stride_img1, img2 + j, stride_img2); ssim_total += v; samples++; } } ssim_total /= samples; return ssim_total; } static uint64_t calc_plane_error(uint8_t *orig, int orig_stride, uint8_t *recon, int recon_stride, unsigned int cols, unsigned int rows) { unsigned int row, col; uint64_t total_sse = 0; int diff; for (row = 0; row < rows; row++) { for (col = 0; col < cols; col++) { diff = orig[col] - recon[col]; total_sse += diff * diff; } orig += orig_stride; recon += recon_stride; } return total_sse; } #define MAX_PSNR 100 double vp9_mse2psnr(double samples, double peak, double mse) { double psnr; if (mse > 0.0) psnr = 10.0 * log10(peak * peak * samples / mse); else psnr = MAX_PSNR; // Limit to prevent / 0 if (psnr > MAX_PSNR) psnr = MAX_PSNR; return psnr; } typedef enum { RAW_YUV, Y4M } input_file_type; typedef struct input_file { FILE *file; input_file_type type; unsigned char *buf; y4m_input y4m; vpx_image_t img; int w; int h; } input_file_t; // Open a file and determine if its y4m or raw. If y4m get the header. int open_input_file(const char *file_name, input_file_t *input, int w, int h) { char y4m_buf[4]; size_t r1; input->type = RAW_YUV; input->buf = NULL; input->file = strcmp(file_name, "-") ? fopen(file_name, "rb") : stdin; if (input->file == NULL) return -1; r1 = fread(y4m_buf, 1, 4, input->file); if (r1 == 4) { if (memcmp(y4m_buf, "YUV4", 4) == 0) input->type = Y4M; switch (input->type) { case Y4M: y4m_input_open(&input->y4m, input->file, y4m_buf, 4, 0); input->w = input->y4m.pic_w; input->h = input->y4m.pic_h; // Y4M alloc's its own buf. Init this to avoid problems if we never // read frames. memset(&input->img, 0, sizeof(input->img)); break; case RAW_YUV: fseek(input->file, 0, SEEK_SET); input->w = w; input->h = h; input->buf = malloc(w * h * 3 / 2); break; } } return 0; } void close_input_file(input_file_t *in) { if (in->file) fclose(in->file); if (in->type == Y4M) { vpx_img_free(&in->img); } else { free(in->buf); } } size_t read_input_file(input_file_t *in, unsigned char **y, unsigned char **u, unsigned char **v) { size_t r1 = 0; switch (in->type) { case Y4M: r1 = y4m_input_fetch_frame(&in->y4m, in->file, &in->img); *y = in->img.planes[0]; *u = in->img.planes[1]; *v = in->img.planes[2]; break; case RAW_YUV: r1 = fread(in->buf, in->w * in->h * 3 / 2, 1, in->file); *y = in->buf; *u = in->buf + in->w * in->h; *v = in->buf + 5 * in->w * in->h / 4; break; } return r1; } int main(int argc, char *argv[]) { FILE *framestats = NULL; int w = 0, h = 0, tl_skip = 0, tl_skips_remaining = 0; double ssimavg = 0, ssimyavg = 0, ssimuavg = 0, ssimvavg = 0; double psnrglb = 0, psnryglb = 0, psnruglb = 0, psnrvglb = 0; double psnravg = 0, psnryavg = 0, psnruavg = 0, psnrvavg = 0; double *ssimy = NULL, *ssimu = NULL, *ssimv = NULL; uint64_t *psnry = NULL, *psnru = NULL, *psnrv = NULL; size_t i, n_frames = 0, allocated_frames = 0; int return_value = 0; input_file_t in[2]; if (argc < 2) { fprintf(stderr, "Usage: %s file1.{yuv|y4m} file2.{yuv|y4m}" "[WxH tl_skip={0,1,3}]\n", argv[0]); return_value = 1; goto clean_up; } if (argc > 3) { sscanf(argv[3], "%dx%d", &w, &h); } if (open_input_file(argv[1], &in[0], w, h) < 0) { fprintf(stderr, "File %s can't be opened or parsed!\n", argv[2]); goto clean_up; } if (w == 0 && h == 0) { // If a y4m is the first file and w, h is not set grab from first file. w = in[0].w; h = in[0].h; } if (open_input_file(argv[2], &in[1], w, h) < 0) { fprintf(stderr, "File %s can't be opened or parsed!\n", argv[2]); goto clean_up; } if (in[0].w != in[1].w || in[0].h != in[1].h || in[0].w != w || in[0].h != h || w == 0 || h == 0) { fprintf(stderr, "Failing: Image dimensions don't match or are unspecified!\n"); return_value = 1; goto clean_up; } // Number of frames to skip from file1.yuv for every frame used. Normal values // 0, 1 and 3 correspond to TL2, TL1 and TL0 respectively for a 3TL encoding // in mode 10. 7 would be reasonable for comparing TL0 of a 4-layer encoding. if (argc > 4) { sscanf(argv[4], "%d", &tl_skip); if (argc > 5) { framestats = fopen(argv[5], "w"); if (!framestats) { fprintf(stderr, "Could not open \"%s\" for writing: %s\n", argv[5], strerror(errno)); return_value = 1; goto clean_up; } } } if (w & 1 || h & 1) { fprintf(stderr, "Invalid size %dx%d\n", w, h); return_value = 1; goto clean_up; } while (1) { size_t r1, r2; unsigned char *y[2], *u[2], *v[2]; r1 = read_input_file(&in[0], &y[0], &u[0], &v[0]); if (r1) { // Reading parts of file1.yuv that were not used in temporal layer. if (tl_skips_remaining > 0) { --tl_skips_remaining; continue; } // Use frame, but skip |tl_skip| after it. tl_skips_remaining = tl_skip; } r2 = read_input_file(&in[1], &y[1], &u[1], &v[1]); if (r1 && r2 && r1 != r2) { fprintf(stderr, "Failed to read data: %s [%d/%d]\n", strerror(errno), (int)r1, (int)r2); return_value = 1; goto clean_up; } else if (r1 == 0 || r2 == 0) { break; } #define psnr_and_ssim(ssim, psnr, buf0, buf1, w, h) \ ssim = vp8_ssim2(buf0, buf1, w, w, w, h); \ psnr = calc_plane_error(buf0, w, buf1, w, w, h); if (n_frames == allocated_frames) { allocated_frames = allocated_frames == 0 ? 1024 : allocated_frames * 2; ssimy = realloc(ssimy, allocated_frames * sizeof(*ssimy)); ssimu = realloc(ssimu, allocated_frames * sizeof(*ssimu)); ssimv = realloc(ssimv, allocated_frames * sizeof(*ssimv)); psnry = realloc(psnry, allocated_frames * sizeof(*psnry)); psnru = realloc(psnru, allocated_frames * sizeof(*psnru)); psnrv = realloc(psnrv, allocated_frames * sizeof(*psnrv)); } psnr_and_ssim(ssimy[n_frames], psnry[n_frames], y[0], y[1], w, h); psnr_and_ssim(ssimu[n_frames], psnru[n_frames], u[0], u[1], w / 2, h / 2); psnr_and_ssim(ssimv[n_frames], psnrv[n_frames], v[0], v[1], w / 2, h / 2); n_frames++; } if (framestats) { fprintf(framestats, "ssim,ssim-y,ssim-u,ssim-v,psnr,psnr-y,psnr-u,psnr-v\n"); } for (i = 0; i < n_frames; ++i) { double frame_ssim; double frame_psnr, frame_psnry, frame_psnru, frame_psnrv; frame_ssim = 0.8 * ssimy[i] + 0.1 * (ssimu[i] + ssimv[i]); ssimavg += frame_ssim; ssimyavg += ssimy[i]; ssimuavg += ssimu[i]; ssimvavg += ssimv[i]; frame_psnr = vp9_mse2psnr(w * h * 6 / 4, 255.0, (double)psnry[i] + psnru[i] + psnrv[i]); frame_psnry = vp9_mse2psnr(w * h * 4 / 4, 255.0, (double)psnry[i]); frame_psnru = vp9_mse2psnr(w * h * 1 / 4, 255.0, (double)psnru[i]); frame_psnrv = vp9_mse2psnr(w * h * 1 / 4, 255.0, (double)psnrv[i]); psnravg += frame_psnr; psnryavg += frame_psnry; psnruavg += frame_psnru; psnrvavg += frame_psnrv; psnryglb += psnry[i]; psnruglb += psnru[i]; psnrvglb += psnrv[i]; if (framestats) { fprintf(framestats, "%lf,%lf,%lf,%lf,%lf,%lf,%lf,%lf\n", frame_ssim, ssimy[i], ssimu[i], ssimv[i], frame_psnr, frame_psnry, frame_psnru, frame_psnrv); } } ssimavg /= n_frames; ssimyavg /= n_frames; ssimuavg /= n_frames; ssimvavg /= n_frames; printf("VpxSSIM: %lf\n", 100 * pow(ssimavg, 8.0)); printf("SSIM: %lf\n", ssimavg); printf("SSIM-Y: %lf\n", ssimyavg); printf("SSIM-U: %lf\n", ssimuavg); printf("SSIM-V: %lf\n", ssimvavg); puts(""); psnravg /= n_frames; psnryavg /= n_frames; psnruavg /= n_frames; psnrvavg /= n_frames; printf("AvgPSNR: %lf\n", psnravg); printf("AvgPSNR-Y: %lf\n", psnryavg); printf("AvgPSNR-U: %lf\n", psnruavg); printf("AvgPSNR-V: %lf\n", psnrvavg); puts(""); psnrglb = psnryglb + psnruglb + psnrvglb; psnrglb = vp9_mse2psnr((double)n_frames * w * h * 6 / 4, 255.0, psnrglb); psnryglb = vp9_mse2psnr((double)n_frames * w * h * 4 / 4, 255.0, psnryglb); psnruglb = vp9_mse2psnr((double)n_frames * w * h * 1 / 4, 255.0, psnruglb); psnrvglb = vp9_mse2psnr((double)n_frames * w * h * 1 / 4, 255.0, psnrvglb); printf("GlbPSNR: %lf\n", psnrglb); printf("GlbPSNR-Y: %lf\n", psnryglb); printf("GlbPSNR-U: %lf\n", psnruglb); printf("GlbPSNR-V: %lf\n", psnrvglb); puts(""); printf("Nframes: %d\n", (int)n_frames); clean_up: close_input_file(&in[0]); close_input_file(&in[1]); if (framestats) fclose(framestats); free(ssimy); free(ssimu); free(ssimv); free(psnry); free(psnru); free(psnrv); return return_value; }