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Diffstat (limited to 'ffmpeg1/tests/tiny_psnr.c')
| -rw-r--r-- | ffmpeg1/tests/tiny_psnr.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/ffmpeg1/tests/tiny_psnr.c b/ffmpeg1/tests/tiny_psnr.c new file mode 100644 index 0000000..264aa4d --- /dev/null +++ b/ffmpeg1/tests/tiny_psnr.c @@ -0,0 +1,264 @@ +/* + * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> + * + * 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 + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <inttypes.h> +#include <assert.h> + +#include "libavutil/intfloat.h" + +#define FFMIN(a, b) ((a) > (b) ? (b) : (a)) +#define F 100 +#define SIZE 2048 + +uint64_t exp16_table[21] = { + 65537, + 65538, + 65540, + 65544, + 65552, + 65568, + 65600, + 65664, + 65793, + 66050, + 66568, + 67616, + 69763, + 74262, + 84150, + 108051, + 178145, + 484249, + 3578144, + 195360063, + 582360139072LL, +}; + +#if 0 +// 16.16 fixpoint exp() +static unsigned int exp16(unsigned int a){ + int i; + int out= 1<<16; + + for(i=19;i>=0;i--){ + if(a&(1<<i)) + out= (out*exp16_table[i] + (1<<15))>>16; + } + + return out; +} +#endif + +// 16.16 fixpoint log() +static int64_t log16(uint64_t a) +{ + int i; + int out = 0; + + if (a < 1 << 16) + return -log16((1LL << 32) / a); + a <<= 16; + + for (i = 20; i >= 0; i--) { + int64_t b = exp16_table[i]; + if (a < (b << 16)) + continue; + out |= 1 << i; + a = ((a / b) << 16) + (((a % b) << 16) + b / 2) / b; + } + return out; +} + +static uint64_t int_sqrt(uint64_t a) +{ + uint64_t ret = 0; + uint64_t ret_sq = 0; + int s; + + for (s = 31; s >= 0; s--) { + uint64_t b = ret_sq + (1ULL << (s * 2)) + (ret << s) * 2; + if (b <= a) { + ret_sq = b; + ret += 1ULL << s; + } + } + return ret; +} + +static int16_t get_s16l(uint8_t *p) +{ + union { + uint16_t u; + int16_t s; + } v; + v.u = p[0] | p[1] << 8; + return v.s; +} + +static float get_f32l(uint8_t *p) +{ + union av_intfloat32 v; + v.i = p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24; + return v.f; +} + +static int run_psnr(FILE *f[2], int len, int shift, int skip_bytes) +{ + int i, j; + uint64_t sse = 0; + uint64_t dev; + uint8_t buf[2][SIZE]; + uint64_t psnr; + int64_t max = (1LL << (8 * len)) - 1; + int size0 = 0; + int size1 = 0; + int maxdist = 0; + int noseek; + + noseek = fseek(f[0], 0, SEEK_SET) || + fseek(f[1], 0, SEEK_SET); + + if (!noseek) { + for (i = 0; i < 2; i++) { + uint8_t *p = buf[i]; + if (fread(p, 1, 12, f[i]) != 12) + return 1; + if (!memcmp(p, "RIFF", 4) && + !memcmp(p + 8, "WAVE", 4)) { + if (fread(p, 1, 8, f[i]) != 8) + return 1; + while (memcmp(p, "data", 4)) { + int s = p[4] | p[5] << 8 | p[6] << 16 | p[7] << 24; + fseek(f[i], s, SEEK_CUR); + if (fread(p, 1, 8, f[i]) != 8) + return 1; + } + } else { + fseek(f[i], -12, SEEK_CUR); + } + } + + fseek(f[shift < 0], abs(shift), SEEK_CUR); + + fseek(f[0], skip_bytes, SEEK_CUR); + fseek(f[1], skip_bytes, SEEK_CUR); + } + + for (;;) { + int s0 = fread(buf[0], 1, SIZE, f[0]); + int s1 = fread(buf[1], 1, SIZE, f[1]); + + for (j = 0; j < FFMIN(s0, s1); j += len) { + int64_t a = buf[0][j]; + int64_t b = buf[1][j]; + int dist; + if (len == 2) { + a = get_s16l(buf[0] + j); + b = get_s16l(buf[1] + j); + } else if (len == 4) { + a = get_f32l(buf[0] + j) * (1 << 24); + b = get_f32l(buf[1] + j) * (1 << 24); + } else { + a = buf[0][j]; + b = buf[1][j]; + } + sse += (a - b) * (a - b); + dist = abs(a - b); + if (dist > maxdist) + maxdist = dist; + } + size0 += s0; + size1 += s1; + if (s0 + s1 <= 0) + break; + } + + i = FFMIN(size0, size1) / len; + if (!i) + i = 1; + dev = int_sqrt(((sse / i) * F * F) + (((sse % i) * F * F) + i / 2) / i); + if (sse) + psnr = ((2 * log16(max << 16) + log16(i) - log16(sse)) * + 284619LL * F + (1LL << 31)) / (1LL << 32); + else + psnr = 1000 * F - 1; // floating point free infinity :) + + printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5d bytes:%9d/%9d\n", + (int)(dev / F), (int)(dev % F), + (int)(psnr / F), (int)(psnr % F), + maxdist, size0, size1); + return psnr; +} + +int main(int argc, char *argv[]) +{ + FILE *f[2]; + int len = 1; + int shift_first= argc < 5 ? 0 : atoi(argv[4]); + int skip_bytes = argc < 6 ? 0 : atoi(argv[5]); + int shift_last = shift_first + (argc < 7 ? 0 : atoi(argv[6])); + int shift; + int max_psnr = -1; + int max_psnr_shift = 0; + + if (argc > 3) { + if (!strcmp(argv[3], "u8")) { + len = 1; + } else if (!strcmp(argv[3], "s16")) { + len = 2; + } else if (!strcmp(argv[3], "f32")) { + len = 4; + } else { + char *end; + len = strtol(argv[3], &end, 0); + if (*end || len < 1 || len > 2) { + fprintf(stderr, "Unsupported sample format: %s\n", argv[3]); + return 1; + } + } + } + + if (argc < 3) { + printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes> [<shift search range>]]]]\n"); + printf("WAV headers are skipped automatically.\n"); + return 1; + } + + f[0] = fopen(argv[1], "rb"); + f[1] = fopen(argv[2], "rb"); + if (!f[0] || !f[1]) { + fprintf(stderr, "Could not open input files.\n"); + return 1; + } + + for (shift = shift_first; shift <= shift_last; shift++) { + int psnr = run_psnr(f, len, shift, skip_bytes); + if (psnr > max_psnr || (shift < 0 && psnr == max_psnr)) { + max_psnr = psnr; + max_psnr_shift = shift; + } + } + if (shift_last > shift_first) + printf("Best PSNR is %3d.%02d for shift %i\n", (int)(max_psnr / F), (int)(max_psnr % F), max_psnr_shift); + return 0; +} |