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tiny_psnr: allow searching for optimal shift value.

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Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Reimar Döffinger 2012-04-06 18:42:07 +02:00
parent 50361e5144
commit cbb7183498
1 changed files with 39 additions and 17 deletions
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56
tests/tiny_psnr.c
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@ -103,34 +103,20 @@ static uint64_t int_sqrt(uint64_t a)
return ret;
}
int main(int argc, char *argv[])
static int run_psnr(FILE *f[2], int len, int shift, int skip_bytes)
{
int i, j;
uint64_t sse = 0;
uint64_t dev;
FILE *f[2];
uint8_t buf[2][SIZE];
uint64_t psnr;
int len = argc < 4 ? 1 : atoi(argv[3]);
int64_t max = (1 << (8 * len)) - 1;
int shift = argc < 5 ? 0 : atoi(argv[4]);
int skip_bytes = argc < 6 ? 0 : atoi(argv[5]);
int size0 = 0;
int size1 = 0;
int maxdist = 0;
if (argc < 3) {
printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\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;
}
rewind(f[0]);
rewind(f[1]);
for (i = 0; i < 2; i++) {
uint8_t *p = buf[i];
@ -193,5 +179,41 @@ int main(int argc, char *argv[])
(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 = argc < 4 ? 1 : atoi(argv[3]);
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) {
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;
}