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/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("[-d | -g | -h | -l power-stream | -p power-stream | -v]")
/* TODO add [-w weight-stream] for [-ghlpv] */
/* Because the syntax for a function returning a function pointer is disgusting. */
typedef void (*process_func)(struct stream *stream);
#define C (j & 3)
/*
* X-parameter 1: method enum value
* X-parameter 2: identifier-friendly name
* X-parameter 3: initial assignments
* X-parameter 4: initial value
* X-parameter 5: subcell processing
* X-parameter 6: subcell finalisation
*/
#define LIST_MEANS(TYPE)\
/* [default] arithmetic mean */\
X(ARITHMETIC, arithmetic,, 0, img[C] += *buf, img[C] /= pixels)\
/* standard deviation */\
X(STANDARD_DEVIATION, sd,, 0, (img[C] += *buf * *buf, aux[C] += *buf),\
img[C] = nnpow((img[C] - aux[C] * aux[C] / pixels) / pixels, (TYPE)0.5)) \
/* geometric mean */\
X(GEOMETRIC, geometric,, 1, img[C] *= *buf, img[C] = nnpow(img[C], 1 / pixels))\
/* harmonic mean */\
X(HARMONIC, harmonic,, 0, img[C] += (TYPE)1 / *buf, img[C] = pixels / img[C])\
/* Lehmer mean */\
X(LEHMER, lehmer, (a[0] = powers[0] - (TYPE)1, a[1] = powers[1] - (TYPE)1,\
a[2] = powers[2] - (TYPE)1, a[3] = powers[3] - (TYPE)1), 0,\
(img[C] += nnpow(*buf, powers[C]), aux[C] += nnpow(*buf, a[C])), img[C] /= aux[C])\
/* power mean (Hölder mean) (m = 2 for root square mean; m = 3 for cubic mean) */\
X(POWER, power,, 0, img[C] += nnpow(*buf, powers[C]),\
img[C] = nnpow(img[C], (TYPE)1 / powers[C]) / pixels)\
/* variance */\
X(VARIANCE, variance,, 0, (img[C] += *buf * *buf, aux[C] += *buf),\
img[C] = (img[C] - aux[C] * aux[C] / pixels) / pixels)
#define X(V, ...) V,
enum method { LIST_MEANS() };
#undef X
static struct stream power;
static const char *power_file = NULL;
#define MAKE_PROCESS(PIXFMT, TYPE,\
_1, NAME, INIT, INITIAL, PROCESS_SUBCELL, FINALISE_SUBCELL)\
static void\
process_##PIXFMT##_##NAME(struct stream *stream)\
{\
TYPE img[4], aux[4], *buf, a[4], powers[4];\
TYPE pixels = (TYPE)(stream->frame_size / sizeof(img));\
size_t i, n, j = 0, m = stream->frame_size / sizeof(*img);\
int first = 1;\
do {\
n = stream->ptr / stream->pixel_size * stream->n_chan;\
buf = (TYPE *)(stream->buf);\
for (i = 0; i < n; i++, buf++, j++, j %= m) {\
if (!j) {\
if (!first) {\
for (j = 0; j < ELEMENTSOF(img); j++)\
FINALISE_SUBCELL;\
j = 0;\
ewriteall(STDOUT_FILENO, img, sizeof(img), "<stdout>");\
}\
first = 0;\
if (power_file && !eread_frame(&power, powers))\
return;\
INIT;\
img[0] = aux[0] = INITIAL;\
img[1] = aux[1] = INITIAL;\
img[2] = aux[2] = INITIAL;\
img[3] = aux[3] = INITIAL;\
}\
PROCESS_SUBCELL;\
}\
n *= sizeof(TYPE);\
memmove(stream->buf, stream->buf + n, stream->ptr -= n);\
} while (eread_stream(stream, SIZE_MAX));\
if (!first) {\
for (j = 0; j < ELEMENTSOF(img); j++)\
FINALISE_SUBCELL;\
ewriteall(STDOUT_FILENO, img, sizeof(img), "<stdout>");\
}\
(void) aux, (void) a, (void) powers, (void) pixels;\
}
#define X(...) MAKE_PROCESS(lf, double, __VA_ARGS__)
LIST_MEANS(double)
#undef X
#define X(...) MAKE_PROCESS(f, float, __VA_ARGS__)
LIST_MEANS(float)
#undef X
#undef MAKE_PROCESS
#undef C
#define X(ID, NAME, ...) [ID] = process_lf_##NAME,
static const process_func process_functions_lf[] = { LIST_MEANS() };
#undef X
#define X(ID, NAME, ...) [ID] = process_f_##NAME,
static const process_func process_functions_f[] = { LIST_MEANS() };
#undef X
int
main(int argc, char *argv[])
{
struct stream stream;
process_func process;
enum method method = ARITHMETIC;
ARGBEGIN {
case 'd':
method = STANDARD_DEVIATION;
break;
case 'g':
method = GEOMETRIC;
break;
case 'h':
method = HARMONIC;
break;
case 'l':
method = LEHMER;
power_file = UARGF();
break;
case 'p':
method = POWER;
power_file = UARGF();
break;
case 'v':
method = VARIANCE;
break;
default:
usage();
} ARGEND;
if (argc)
usage();
eopen_stream(&stream, NULL);
if (power_file != NULL) {
eopen_stream(&power, power_file);
if (power.width != 1 || power.height != 1)
eprintf("%s: videos do not have the 1x1 geometry\n", power_file);
if (strcmp(power.pixfmt, stream.pixfmt))
eprintf("videos use incompatible pixel formats\n");
}
CHECK_N_CHAN(&stream, 4, 4);
if (stream.encoding == DOUBLE)
process = process_functions_lf[method];
else if (stream.encoding == FLOAT)
process = process_functions_f[method];
else
eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
if (DPRINTF_HEAD(STDOUT_FILENO, stream.frames, 1, 1, stream.pixfmt) < 0)
eprintf("dprintf:");
process(&stream);
if (stream.ptr)
eprintf("%s: incomplete frame\n", stream.file);
return 0;
}
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