Skip to content

Instantly share code, notes, and snippets.

@harieamjari

harieamjari/2dwave00.c

Last active April 7, 2021 08:34
Show Gist options
  • Star 0 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
  • Save harieamjari/4f2e157b86bba59809febf8c0c2a9e8f to your computer and use it in GitHub Desktop.
Save harieamjari/4f2e157b86bba59809febf8c0c2a9e8f to your computer and use it in GitHub Desktop.
Download ZIP
2D wave equation solver
Raw
2dwave00.c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include <png.h>
#ifdef NDEBUG
#error "Don't turn NDEBUG!!"
#endif
#define frame 500
const int width = 1000, height = 700;
static double
init2d (int x, int y)
{
return pow (M_E, -6.0 * (pow ((double) x - (double) width / 2.0,
2.0) + pow ((double) y -
(double) height / 2.0,
2.0)) / 10900.0);
}
static void
write_heatmap (double p, png_bytep px)
{
px[0] = (png_byte) ((p + 1.0) * 255.0 / 2.0);
px[1] = px[0];
px[2] = px[0];
px[3] = 255;
}
int
main ()
{
double **v, **u;
v = malloc (sizeof (double *) * height);
u = malloc (sizeof (double *) * height);
assert (v != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
{
v[y] = malloc (sizeof (double) * width);
u[y] = malloc (sizeof (double) * width);
assert (u[y] != NULL && v[y] != NULL);
}
#pragma omp parallel for
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
u[y][x] = init2d (x, y);
v[y][x] = 0.0;
}
printf ("Allocate png frames... ");
png_bytep **png_frame = malloc (sizeof (png_bytep *) * frame);
assert (png_frame != NULL);
#pragma omp parallel for
for (int file = 0; file < frame; file++)
{
assert ((png_frame[file] =
malloc (sizeof (png_bytep) * height)) != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
assert ((png_frame[file][y] = malloc (4 * width)) != NULL);
}
puts ("done");
/* This is where the simulation begins */
fflush (stdout);
double delta_x = 0.01, c = 89.0, h = 4.0;
for (int file = 1; file < frame; file++)
{
printf ("\rSimulation %d/%d... ", file, frame - 1);
fflush (stdout);
for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
v[y][x] +=
delta_x * c * c * (u[((y - 1) < 0) ? 0 : y - 1][x] +
u[((y + 1) ==
height) ? height - 1 : y + 1][x] +
u[y][((x - 1) <
0) ? 0 : x - 1] + u[y][((x + 1) ==
width) ?
width -
1 : x + 1] -
(4.0 * u[y][x])) / (h*h);
}
#pragma omp parallel for
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
u[y][x] += delta_x * v[y][x];
#pragma omp parallel for
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
write_heatmap (u[y][x], &png_frame[file][y][x * 4]);
}
puts ("done");
fflush(stdout);
/* free */
#pragma omp parallel for
for (int y = 0; y < height; y++)
{
free (u[y]);
free (v[y]);
}
free (u);
free (v);
/* write png frames */
int total = 0;
#pragma omp parallel for
for (int file = 0; file < frame; file++)
{
FILE *fpout = NULL;
char buff[50] = { 0 };
sprintf (buff, "tt-%03d.png", file);
#pragma omp critical
{
printf ("\rWriting png frame: %s %d/%d", buff, total++, frame - 1);
fflush (stdout);
}
fpout = fopen (buff, "wb");
if (fpout == NULL)
{
perror (buff);
exit (1);;
}
png_structp png =
png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
assert (png != NULL);
png_infop info = png_create_info_struct (png);
assert (info != NULL);
if (setjmp (png_jmpbuf (png)))
abort ();
png_init_io (png, fpout);
// INDENT-OFF
png_set_IHDR (png,
info,
width, height,
8,
PNG_COLOR_TYPE_RGBA,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
// INDENT-ON
png_write_info (png, info);
png_write_image (png, png_frame[file]);
png_write_end (png, NULL);
fclose (fpout);
png_destroy_write_struct (&png, &info);
#pragma omp parallel for
for (int y = 0; y < height; y++)
free (png_frame[file][y]);
free (png_frame[file]);
}
putchar ('\n');
free (png_frame);
return 0;
}
Raw
2dwave01.c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include <png.h>
#ifdef NDEBUG
#error "Don't turn NDEBUG!!"
#endif
#define frame 500
const int width = 1000, height = 700;
static double
init2d (int x, int y)
{
return pow (M_E, -6.0 * (pow ((double) x - (double) width / 2.0,
2.0) + pow ((double) y -
(double) height / 2.0,
2.0)) / 10900.0);
}
static void
write_heatmap (double p, png_bytep px)
{
px[0] = (png_byte) ((p + 1.0) * 255.0 / 2.0);
px[1] = px[0];
px[2] = px[0];
px[3] = 255;
}
int
main ()
{
double **v, **u;
v = malloc (sizeof (double *) * height);
u = malloc (sizeof (double *) * height);
assert (v != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
{
v[y] = malloc (sizeof (double) * width);
u[y] = malloc (sizeof (double) * width);
assert (u[y] != NULL && v[y] != NULL);
}
#pragma omp parallel for
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
u[y][x] = init2d (x, y);
v[y][x] = 0.0;
}
printf ("Allocate png frames... ");
png_bytep **png_frame = malloc (sizeof (png_bytep *) * frame);
assert (png_frame != NULL);
#pragma omp parallel for
for (int file = 0; file < frame; file++)
{
assert ((png_frame[file] =
malloc (sizeof (png_bytep) * height)) != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
assert ((png_frame[file][y] = malloc (4 * width)) != NULL);
}
puts ("done");
/* This is where the simulation begins */
fflush (stdout);
double delta_x = 0.0001, c = 89.0, h = 4.0;
for (int file = 1; file < frame; file++)
{
printf ("\rSimulation %d/%d... ", file, frame - 1);
fflush (stdout);
for (int i = 0; i < 416; i++){
for (int x = 0; x < width; x++)
#pragma omp parallel for schedule(monotonic:dynamic)
for (int y = 0; y < height; y++)
#pragma omp critical
v[y][x] +=
delta_x * c * c * (u[((y - 1) < 0) ? 0 : y - 1][x] +
u[((y + 1) ==
height) ? height - 1 : y + 1][x] +
u[y][((x - 1) <
0) ? 0 : x - 1] + u[y][((x + 1) ==
width) ?
width -
1 : x + 1] -
(4.0 * u[y][x])) / (h*h);
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
u[y][x] += delta_x * v[y][x];
}
#pragma omp parallel for
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
write_heatmap (u[y][x], &png_frame[file][y][x * 4]);
}
puts ("done");
fflush (stdout);
/* free */
#pragma omp parallel for
for (int y = 0; y < height; y++)
{
free (u[y]);
free (v[y]);
}
free (u);
free (v);
/* write png frames */
int total = 0;
#pragma omp parallel for
for (int file = 0; file < frame; file++)
{
FILE *fpout = NULL;
char buff[50] = { 0 };
sprintf (buff, "tt-%03d.png", file);
#pragma omp critical
{
printf ("\rWriting png frame: %s %d/%d", buff, total++, frame - 1);
fflush (stdout);
}
fpout = fopen (buff, "wb");
if (fpout == NULL)
{
perror (buff);
exit (1);;
}
png_structp png =
png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
assert (png != NULL);
png_infop info = png_create_info_struct (png);
assert (info != NULL);
if (setjmp (png_jmpbuf (png)))
abort ();
png_init_io (png, fpout);
// INDENT-OFF
png_set_IHDR (png,
info,
width, height,
8,
PNG_COLOR_TYPE_RGBA,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
// INDENT-ON
png_write_info (png, info);
png_write_image (png, png_frame[file]);
png_write_end (png, NULL);
fclose (fpout);
png_destroy_write_struct (&png, &info);
#pragma omp parallel for
for (int y = 0; y < height; y++)
free (png_frame[file][y]);
free (png_frame[file]);
}
putchar ('\n');
free (png_frame);
return 0;
}
Raw
2dwave02.c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include <png.h>
#ifdef NDEBUG
#error "Don't turn NDEBUG!!"
#endif
#define frame 10
#define FPS 25.0
const int width = 1000, height = 700;
static double
init2d (int x, int y)
{
return pow (M_E, -6.0 * (pow ((double) x - (double) width / 2.0,
2.0) + pow ((double) y -
(double) height / 2.0,
2.0)) / 10900.0);
}
static void
write_heatmap (double p, png_bytep px)
{
px[0] = (png_byte) ((p + 1.0) * 255.0 / 2.0);
px[1] = px[0];
px[2] = px[0];
px[3] = 255;
}
int
main ()
{
double **v, **u;
const double delta_x = 0.01, c = 89.0, h = 4.0;
v = malloc (sizeof (double *) * height);
u = malloc (sizeof (double *) * height);
assert (v != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
{
v[y] = malloc (sizeof (double) * width);
u[y] = malloc (sizeof (double) * width);
assert (u[y] != NULL && v[y] != NULL);
}
#pragma omp parallel for
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
u[y][x] = init2d (x, y);
v[y][x] = 0.0;
}
png_bytep *png_frame = malloc (sizeof (png_byte) * height);
assert (png_frame != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
assert ((png_frame[y] = malloc (4 * width)) != NULL);
/* This is where the simulation begins */
#pragma omp parallel for ordered schedule(static)
for (int file = 0; file < frame; file++)
{
char buff[50] = { 0 };
sprintf (buff, "tt-%03d.png", file);
#pragma omp ordered
{
printf ("\rWriting png frame: %s %d/%d... ", buff, file, frame - 1);
fflush (stdout);
for (int i = 0; i < (int) (1.0 / (FPS * delta_x)); i++)
{
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
v[y][x] +=
delta_x * c * c * (u[((y - 1) < 0) ? 0 : y - 1][x] +
u[((y + 1) ==
height) ? height - 1 : y + 1][x] +
u[y][((x - 1) <
0) ? 0 : x - 1] + u[y][((x + 1) ==
width) ?
width -
1 : x + 1] -
(4.0 * u[y][x])) / (h * h);
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
u[y][x] += delta_x * v[y][x];
}
#pragma omp parallel for
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
write_heatmap (u[y][x], &png_frame[y][x * 4]);
FILE *fpout = fopen (buff, "wb");
if (fpout == NULL)
{
perror (buff);
exit (1);;
}
png_structp png =
png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
assert (png != NULL);
png_infop info = png_create_info_struct (png);
assert (info != NULL);
if (setjmp (png_jmpbuf (png)))
abort ();
png_init_io (png, fpout);
// INDENT-OFF
png_set_IHDR (png,
info,
width, height,
8,
PNG_COLOR_TYPE_RGBA,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
// INDENT-ON
png_write_info (png, info);
png_write_image (png, png_frame);
png_write_end (png, NULL);
fclose (fpout);
png_destroy_write_struct (&png, &info);
}
}
free (png_frame);
/* free */
#pragma omp parallel for
for (int y = 0; y < height; y++)
{
free (u[y]);
free (v[y]);
}
free (u);
free (v);
puts ("done");
fflush (stdout);
return 0;
}
Raw
2dwave03.c
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include <png.h>
#ifdef NDEBUG
#error "Don't turn NDEBUG!!"
#endif
#define frame 1000
#define FPS 25.0
const int width = 1000, height = 700;
static double
init2d (int x, int y)
{
return pow (M_E, -6.0 * (pow ((double) x - (double) width / 2.0,
2.0) + pow ((double) y -
(double) height / 2.0,
2.0)) / 10900.0);
}
static void
write_heatmap (double p, png_bytep px)
{
px[0] = (png_byte) ((p + 1.0) * 255.0 / 2.0);
px[1] = px[0];
px[2] = px[0];
px[3] = 255;
}
int
main ()
{
double **v, **u;
const double delta_x = 0.01, c = 89.0, h = 4.0;
v = malloc (sizeof (double *) * height);
u = malloc (sizeof (double *) * height);
assert (v != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
{
v[y] = malloc (sizeof (double) * width);
u[y] = malloc (sizeof (double) * width);
assert (u[y] != NULL && v[y] != NULL);
}
#pragma omp parallel for
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
u[y][x] = init2d (x, y);
v[y][x] = 0.0;
}
png_bytep *png_frame = malloc (sizeof (png_byte*) * height);
assert (png_frame != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
assert ((png_frame[y] = malloc (4 * width)) != NULL);
/* This is where the simulation begins */
#pragma omp parallel for ordered schedule(dynamic)
for (int file = 0; file < frame; file++)
{
#pragma omp ordered
{
char buff[50] = { 0 };
sprintf (buff, "tt-%03d.png", file);
printf ("\rWriting png frame: %s %d/%d... ", buff, file, frame - 1);
fflush (stdout);
for (int i = 0; i < (int) (1.0 / (FPS * delta_x)); i++)
{
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++){
v[y][x] +=
delta_x * c * c * (u[((y - 1) < 0) ? 0 : y - 1][x] +
u[((y + 1) ==
height) ? height - 1 : y + 1][x] +
u[y][((x - 1) <
0) ? 0 : x - 1] + u[y][((x + 1) ==
width) ?
width -
1 : x + 1] -
(4.0 * u[y][x])) / (h * h);}
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
u[y][x] += delta_x * v[y][x];
}
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
write_heatmap (u[y][x], &png_frame[y][x * 4]);
FILE *fpout = fopen (buff, "wb");
if (fpout == NULL)
{
perror (buff);
exit (1);;
}
png_structp png =
png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
assert (png != NULL);
png_infop info = png_create_info_struct (png);
assert (info != NULL);
if (setjmp (png_jmpbuf (png)))
abort ();
png_init_io (png, fpout);
// INDENT-OFF
png_set_IHDR (png,
info,
width, height,
8,
PNG_COLOR_TYPE_RGBA,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
// INDENT-ON
png_write_info (png, info);
png_write_image (png, png_frame);
png_write_end (png, NULL);
fclose (fpout);
png_destroy_write_struct (&png, &info);
}
}
/* free */
#pragma omp parallel for
for (int y = 0; y < height; y++)
free (png_frame[y]);
free (png_frame);
#pragma omp parallel for
for (int y = 0; y < height; y++)
{
free (u[y]);
free (v[y]);
}
free (u);
free (v);
puts ("done");
fflush (stdout);
return 0;
}
Raw
2dwave04.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <math.h>
#include <signal.h>
#include <assert.h>
#include <png.h>
#ifdef NDEBUG
#error "Don't turn NDEBUG!!"
#endif
#define frame 10
#define FPS 25.0
char wav_struct[] = {
'R', 'I', 'F', 'F',
0, 0, 0, 0, /* chunksize */
'W', 'A', 'V', 'E',
'f', 'm', 't', ' ', /* subchunk1id */
16, 0, 0, 0, /* subchunk1size */
1, 0, /* audioformat */
1, 0, /* numchannels */
68, 172, 0, 0, /* samplerate 44100 */
136, 88, 1, 0, /* byterate 88200 */
2, 0, /* blockalign */
16, 0, /* bitspersample */
'd', 'a', 't', 'a', /* subchunk2id */
0, 0, 0, 0 /* subchunk2size */
};
double **v = NULL, **u = NULL;
int16_t *pcmin = NULL, *pcmout = NULL;
png_bytep *png_frame = NULL;
const int width = 1000, height = 700;
int pcm_ctr = 0;
void
write_wav (void)
{
uint32_t length = 32 + (pcm_ctr << 1);
uint32_t subchunk2size = pcm_ctr << 1;
FILE *fpout = fopen ("write.wav", "wb");
fwrite (wav_struct, sizeof (wav_struct), 1, fpout);
fwrite (pcmout, sizeof (int16_t), pcm_ctr, fpout);
fseek (fpout, 4, SEEK_SET);
fwrite (&length, sizeof (uint32_t), 1, fpout);
fseek (fpout, 40, SEEK_SET);
fwrite (&subchunk2size, sizeof (uint32_t), 1, fpout);
fclose (fpout);
}
void
intHandler (int c)
{
printf ("\nSignal is catched, exiting normally...\n");
write_wav ();
free (pcmin);
free (pcmout);
if (u != NULL)
for (int y = 0; y < height; y++)
free (u[y]);
if (v != NULL)
for (int y = 0; y < height; y++)
free (v[y]);
if (png_frame != NULL)
for (int y = 0; y < height; y++)
free (png_frame[y]);
free (png_frame);
free (u);
free (v);
exit (1);
}
static double
init2d (int x, int y)
{
return pow (M_E, -6.0 * (pow ((double) x - (double) width / 2.0,
2.0) + pow ((double) y -
(double) height / 2.0,
2.0)) / 10900.0);
}
static void
write_heatmap (double p, png_bytep px)
{
px[0] = (png_byte) (((p / 32768.0) + 1.0) * 255.0 / 2.0);
px[1] = px[0];
px[2] = px[0];
px[3] = 255;
}
int
main (int argc, char **argv)
{
signal (SIGINT, intHandler);
if (argc != 2)
{
fprintf (stderr, "usage: %s [wav file]\n", argv[0]);
return 1;
}
FILE *wavin = fopen (argv[1], "rb");
if (wavin == NULL)
{
perror (argv[1]);
return 1;
}
/* begin checking wav file the normative way */
char RIFFTag[5] = { 0 };
fread (RIFFTag, 1, 4, wavin);
if (strcmp ("RIFF", RIFFTag))
{
fprintf (stderr, "Unrecognize file format: %s\n", argv[1]);
return 1;
}
/* begin check sample rate */
uint32_t samplerate;
fseek (wavin, 24, SEEK_SET);
fread (&samplerate, sizeof (uint32_t), 1, wavin);
if (samplerate != 44100)
{
fprintf (stderr, "%s samplerate must be 44100 not %d\n", argv[1],
samplerate);
fclose (wavin);
return 1;
}
/* end check samplerate */
uint16_t audioformat;
fseek (wavin, 20, SEEK_SET);
fread (&audioformat, sizeof (uint16_t), 1, wavin);
if (audioformat != 1)
{
fprintf (stderr, "%s must be a PCM!\n", argv[1]);
fclose (wavin);
return 1;
}
uint16_t channels;
fseek (wavin, 22, SEEK_SET);
fread (&channels, sizeof (uint16_t), 1, wavin);
if (channels != 1)
{
fprintf (stderr, "%s must be a mono wav file!\n", argv[1]);
fclose (wavin);
return 1;
}
uint16_t blockalign;
fseek (wavin, 32, SEEK_SET);
fread (&blockalign, sizeof (uint16_t), 1, wavin);
if (blockalign != 2)
{
fprintf (stderr, "%s must be a 16-bit wav file!\n", argv[1]);
fclose (wavin);
return 1;
}
char data_tag[4] = { 0 };
fseek (wavin, 36, SEEK_SET);
do
{
if (fread (data_tag, 1, 4, wavin) != 4)
{
fprintf (stderr, "No data tag!!\n");
return 1;
}
if (!strncmp (data_tag, "data", 4))
{
break;
}
else
fseek (wavin, -3, SEEK_CUR);
}
while (1);
/* begin count numsamples */
uint32_t numsamples;
fread (&numsamples, sizeof (uint32_t), 1, wavin);
numsamples >>= 1;
printf ("numsamples: %d\n", numsamples);
/* end count numsamples */
pcmin = malloc (sizeof (int16_t) * numsamples);
pcmout = malloc (sizeof (int16_t) * numsamples);
fread (pcmin, sizeof (int16_t), numsamples, wavin);
const double delta_x = 1.0 / 44100.0, c = 250.0, h = 2.0;
v = malloc (sizeof (double *) * height);
u = malloc (sizeof (double *) * height);
assert (v != NULL && u != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
{
v[y] = malloc (sizeof (double) * width);
u[y] = malloc (sizeof (double) * width);
assert (u[y] != NULL && v[y] != NULL);
}
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
u[y][x] = 0.0; //init2d (x, y);
v[y][x] = 0.0;
}
png_frame = malloc (sizeof (png_byte *) * height);
assert (png_frame != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
assert ((png_frame[y] = malloc (4 * width)) != NULL);
/* This is where the simulation begins */
#pragma omp parallel for ordered schedule(dynamic)
for (int file = 0; file < (numsamples * 25) / 44100; file++)
{
char buff[50] = { 0 };
#pragma omp ordered
{
sprintf (buff, "tt-%03d.png", file);
printf ("\rWriting png frame: %s %d/%d... ", buff, file, ((numsamples * 25) / 44100) - 1);
fflush (stdout);
for (int i = 0; i < (int) (1.0 / (FPS * delta_x)); i++)
{
int bb = printf ("%d/%d", i, (int) (1.0 / (FPS * delta_x)) - 1);
fflush (stdout);
u[height / 2][width / 2] += (double) pcmin[pcm_ctr];
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
v[y][x] +=
delta_x * c * c * (u[((y - 1) < 0) ? 0 : y - 1][x] +
u[((y + 1) ==
height) ? height - 1 : y + 1][x] +
u[y][((x - 1) <
0) ? 0 : x - 1] + u[y][((x +
1) ==
width) ?
width -
1 : x +
1] -
(4.0 * u[y][x])) / (h * h);
}
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
u[y][x] += delta_x * v[y][x];
//u[y][x] *= 0.99999; // damp
}
pcmout[pcm_ctr] = (int16_t) u[300][width / 2];
pcm_ctr++;
for (int i = 0; i < bb; i++)
putchar ('\b');
}
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
write_heatmap (u[y][x], &png_frame[y][x * 4]);
}
FILE *fpout = fopen (buff, "wb");
if (fpout == NULL)
{
perror (buff);
exit (1);;
}
png_structp png =
png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
assert (png != NULL);
png_infop info = png_create_info_struct (png);
assert (info != NULL);
if (setjmp (png_jmpbuf (png)))
abort ();
png_init_io (png, fpout);
// INDENT-OFF
png_set_IHDR (png,
info,
width, height,
8,
PNG_COLOR_TYPE_RGBA,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
// INDENT-ON
png_write_info (png, info);
png_write_image (png, png_frame);
png_write_end (png, NULL);
fclose (fpout);
png_destroy_write_struct (&png, &info);
};
write_wav ();
free (pcmin);
free (pcmout);
if (u != NULL)
for (int y = 0; y < height; y++)
free (u[y]);
if (v != NULL)
for (int y = 0; y < height; y++)
free (v[y]);
if (png_frame != NULL)
for (int y = 0; y < height; y++)
free (png_frame[y]);
free (png_frame);
free (u);
free (v);
puts ("done");
fflush (stdout);
return 0;
}
Raw
2dwave05.c
/* gcc 2dwave04.c -lpng16 -lm -lz -O3 -march=native -fopenmp -Wall -Wextra */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <math.h>
#include <signal.h>
#include <assert.h>
#include <png.h>
#ifdef NDEBUG
#error "Don't turn NDEBUG!!"
#endif
#define frame 10
#define FPS 25.0
char wav_struct[] = {
'R', 'I', 'F', 'F',
0, 0, 0, 0, /* chunksize */
'W', 'A', 'V', 'E',
'f', 'm', 't', ' ', /* subchunk1id */
16, 0, 0, 0, /* subchunk1size */
1, 0, /* audioformat */
1, 0, /* numchannels */
68, 172, 0, 0, /* samplerate 44100 */
136, 88, 1, 0, /* byterate 88200 */
2, 0, /* blockalign */
16, 0, /* bitspersample */
'd', 'a', 't', 'a', /* subchunk2id */
0, 0, 0, 0 /* subchunk2size */
};
double **v = NULL, **u = NULL;
int16_t *pcmin = NULL, *pcmout = NULL;
png_bytep *png_frame = NULL;
const int width = 1000, height = 700;
int pcm_ctr = 0;
void
write_wav (void)
{
uint32_t length = 32 + (pcm_ctr << 1);
uint32_t subchunk2size = pcm_ctr << 1;
FILE *fpout = fopen ("write.wav", "wb");
fwrite (wav_struct, sizeof (wav_struct), 1, fpout);
fwrite (pcmout, sizeof (int16_t), pcm_ctr, fpout);
fseek (fpout, 4, SEEK_SET);
fwrite (&length, sizeof (uint32_t), 1, fpout);
fseek (fpout, 40, SEEK_SET);
fwrite (&subchunk2size, sizeof (uint32_t), 1, fpout);
fclose (fpout);
}
void
intHandler (int c)
{
printf ("\nSignal is catched, exiting normally...\n");
write_wav ();
free (pcmin);
free (pcmout);
if (u != NULL)
for (int y = 0; y < height; y++)
free (u[y]);
if (v != NULL)
for (int y = 0; y < height; y++)
free (v[y]);
if (png_frame != NULL)
for (int y = 0; y < height; y++)
free (png_frame[y]);
free (png_frame);
free (u);
free (v);
exit (1);
}
static double
init2d (int x, int y)
{
return pow (M_E, -6.0 * (pow ((double) x - (double) width / 2.0,
2.0) + pow ((double) y -
(double) height / 2.0,
2.0)) / 10900.0);
}
static void
write_heatmap (double p, png_bytep px)
{
px[0] = (png_byte) (((p / 32768.0) + 1.0) * 255.0 / 2.0);
px[1] = px[0];
px[2] = px[0];
px[3] = 255;
}
int
main (int argc, char **argv)
{
signal (SIGINT, intHandler);
if (argc != 2)
{
fprintf (stderr, "usage: %s [wav file]\n", argv[0]);
return 1;
}
FILE *wavin = fopen (argv[1], "rb");
if (wavin == NULL)
{
perror (argv[1]);
return 1;
}
/* begin checking wav file the normative way */
char RIFFTag[5] = { 0 };
fread (RIFFTag, 1, 4, wavin);
if (strcmp ("RIFF", RIFFTag))
{
fprintf (stderr, "Unrecognize file format: %s\n", argv[1]);
return 1;
}
/* begin check sample rate */
uint32_t samplerate;
fseek (wavin, 24, SEEK_SET);
fread (&samplerate, sizeof (uint32_t), 1, wavin);
if (samplerate != 44100)
{
fprintf (stderr, "%s samplerate must be 44100 not %d\n", argv[1],
samplerate);
fclose (wavin);
return 1;
}
/* end check samplerate */
uint16_t audioformat;
fseek (wavin, 20, SEEK_SET);
fread (&audioformat, sizeof (uint16_t), 1, wavin);
if (audioformat != 1)
{
fprintf (stderr, "%s must be a PCM!\n", argv[1]);
fclose (wavin);
return 1;
}
uint16_t channels;
fseek (wavin, 22, SEEK_SET);
fread (&channels, sizeof (uint16_t), 1, wavin);
if (channels != 1)
{
fprintf (stderr, "%s must be a mono wav file!\n", argv[1]);
fclose (wavin);
return 1;
}
uint16_t blockalign;
fseek (wavin, 32, SEEK_SET);
fread (&blockalign, sizeof (uint16_t), 1, wavin);
if (blockalign != 2)
{
fprintf (stderr, "%s must be a 16-bit wav file!\n", argv[1]);
fclose (wavin);
return 1;
}
char data_tag[4] = { 0 };
fseek (wavin, 36, SEEK_SET);
do
{
if (fread (data_tag, 1, 4, wavin) != 4)
{
fprintf (stderr, "No data tag!!\n");
return 1;
}
if (!strncmp (data_tag, "data", 4))
{
break;
}
else
fseek (wavin, -3, SEEK_CUR);
}
while (1);
/* begin count numsamples */
uint32_t numsamples;
fread (&numsamples, sizeof (uint32_t), 1, wavin);
numsamples >>= 1;
printf ("numsamples: %d\n", numsamples);
/* end count numsamples */
pcmin = malloc (sizeof (int16_t) * numsamples);
pcmout = malloc (sizeof (int16_t) * numsamples);
fread (pcmin, sizeof (int16_t), numsamples, wavin);
fclose(wavin);
const double delta_x = 1.0 / 44100.0, c = 450.0, h = 1.0;
v = malloc (sizeof (double *) * height);
u = malloc (sizeof (double *) * height);
assert (v != NULL && u != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
{
v[y] = malloc (sizeof (double) * width);
u[y] = malloc (sizeof (double) * width);
assert (u[y] != NULL && v[y] != NULL);
}
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
u[y][x] = 0.0; //init2d (x, y);
v[y][x] = 0.0;
}
png_frame = malloc (sizeof (png_byte *) * height);
assert (png_frame != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
assert ((png_frame[y] = malloc (4 * width)) != NULL);
/* This is where the simulation begins */
#pragma omp parallel for ordered schedule(dynamic)
for (uint32_t file = 0; file < (numsamples * 25) / 44100; file++)
{
char buff[50] = { 0 };
#pragma omp ordered
{
sprintf (buff, "tt-%03d.png", file);
printf ("\rWriting png frame: %s %d/%d... ", buff, file, ((numsamples * 25) / 44100) - 1);
fflush (stdout);
for (int i = 0; i < (int) (1.0 / (FPS * delta_x)); i++)
{
int bb = printf ("%d/%d", i, (int) (1.0 / (FPS * delta_x)) - 1);
fflush (stdout);
u[height / 2][width / 2] = (double) pcmin[pcm_ctr];
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
v[y][x] +=
delta_x * c * c * (u[((y - 1) < 0) ? 0 : y - 1][x] +
u[((y + 1) ==
height) ? height - 1 : y + 1][x] +
u[y][((x - 1) <
0) ? 0 : x - 1] + u[y][((x +
1) ==
width) ?
width -
1 : x +
1] -
(4.0 * u[y][x])) / (h * h);
}
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
u[y][x] += delta_x * v[y][x];
//u[y][x] *= 0.99999; // damp
}
pcmout[pcm_ctr] = (int16_t) u[(height/2) + 50][width / 2];
pcm_ctr++;
for (int i = 0; i < bb; i++)
putchar ('\b');
}
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
write_heatmap (u[y][x], &png_frame[y][x * 4]);
}
png_frame[(height/2) + 50 ][width/2] = 255;
png_frame[(height/2) + 50 ][(width/2) + 1] = 0;
png_frame[(height/2) + 50 ][(width/2) + 2] = 0;
FILE *fpout = fopen (buff, "wb");
if (fpout == NULL)
{
perror (buff);
exit (1);;
}
png_structp png =
png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
assert (png != NULL);
png_infop info = png_create_info_struct (png);
assert (info != NULL);
if (setjmp (png_jmpbuf (png)))
abort ();
png_init_io (png, fpout);
// INDENT-OFF
png_set_IHDR (png,
info,
width, height,
8,
PNG_COLOR_TYPE_RGBA,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
// INDENT-ON
png_write_info (png, info);
write_wav ();
png_write_image (png, png_frame);
png_write_end (png, NULL);
fclose (fpout);
png_destroy_write_struct (&png, &info);
};
free (pcmin);
free (pcmout);
if (u != NULL)
for (int y = 0; y < height; y++)
free (u[y]);
if (v != NULL)
for (int y = 0; y < height; y++)
free (v[y]);
if (png_frame != NULL)
for (int y = 0; y < height; y++)
free (png_frame[y]);
free (png_frame);
free (u);
free (v);
puts ("done");
fflush (stdout);
return 0;
}
Raw
2dwave06.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <math.h>
#include <signal.h>
#include <assert.h>
#include <png.h>
#ifdef NDEBUG
#error "Don't turn NDEBUG!!"
#endif
#define frame 10
#define FPS 25.0
char wav_struct[] = {
'R', 'I', 'F', 'F',
0, 0, 0, 0, /* chunksize */
'W', 'A', 'V', 'E',
'f', 'm', 't', ' ', /* subchunk1id */
16, 0, 0, 0, /* subchunk1size */
1, 0, /* audioformat */
1, 0, /* numchannels */
68, 172, 0, 0, /* samplerate 44100 */
136, 88, 1, 0, /* byterate 88200 */
2, 0, /* blockalign */
16, 0, /* bitspersample */
'd', 'a', 't', 'a', /* subchunk2id */
0, 0, 0, 0 /* subchunk2size */
};
double **v = NULL, **u = NULL;
int16_t *pcmin = NULL, *pcmout = NULL;
png_bytep *png_frame = NULL;
const int width = 1000, height = 700;
int pcm_ctr = 0;
void
write_wav (void)
{
uint32_t length = 32 + (pcm_ctr << 1);
uint32_t subchunk2size = pcm_ctr << 1;
FILE *fpout = fopen ("write.wav", "wb");
fwrite (wav_struct, sizeof (wav_struct), 1, fpout);
fwrite (pcmout, sizeof (int16_t), pcm_ctr, fpout);
fseek (fpout, 4, SEEK_SET);
fwrite (&length, sizeof (uint32_t), 1, fpout);
fseek (fpout, 40, SEEK_SET);
fwrite (&subchunk2size, sizeof (uint32_t), 1, fpout);
fclose (fpout);
}
void
intHandler (int c)
{
printf ("\nSignal is catched, exiting normally...\n");
write_wav ();
free (pcmin);
free (pcmout);
if (u != NULL)
for (int y = 0; y < height; y++)
free (u[y]);
if (v != NULL)
for (int y = 0; y < height; y++)
free (v[y]);
if (png_frame != NULL)
for (int y = 0; y < height; y++)
free (png_frame[y]);
free (png_frame);
free (u);
free (v);
exit (1);
}
static double
init2d (int x, int y)
{
return pow (M_E, -6.0 * (pow ((double) x - (double) width / 2.0,
2.0) + pow ((double) y -
(double) height / 2.0,
2.0)) / 10900.0);
}
static void
write_heatmap (double p, png_bytep px)
{
px[0] = (png_byte) (((p / 32768.0) + 1.0) * 255.0 / 2.0);
px[1] = px[0];
px[2] = px[0];
px[3] = 255;
}
int
main (int argc, char **argv)
{
signal (SIGINT, intHandler);
if (argc != 2)
{
fprintf (stderr, "usage: %s [wav file]\n", argv[0]);
return 1;
}
FILE *wavin = fopen (argv[1], "rb");
if (wavin == NULL)
{
perror (argv[1]);
return 1;
}
/* begin checking wav file the normative way */
char RIFFTag[5] = { 0 };
fread (RIFFTag, 1, 4, wavin);
if (strcmp ("RIFF", RIFFTag))
{
fprintf (stderr, "Unrecognize file format: %s\n", argv[1]);
return 1;
}
/* begin check sample rate */
uint32_t samplerate;
fseek (wavin, 24, SEEK_SET);
fread (&samplerate, sizeof (uint32_t), 1, wavin);
if (samplerate != 44100)
{
fprintf (stderr, "%s samplerate must be 44100 not %d\n", argv[1],
samplerate);
fclose (wavin);
return 1;
}
/* end check samplerate */
uint16_t audioformat;
fseek (wavin, 20, SEEK_SET);
fread (&audioformat, sizeof (uint16_t), 1, wavin);
if (audioformat != 1)
{
fprintf (stderr, "%s must be a PCM!\n", argv[1]);
fclose (wavin);
return 1;
}
uint16_t channels;
fseek (wavin, 22, SEEK_SET);
fread (&channels, sizeof (uint16_t), 1, wavin);
if (channels != 1)
{
fprintf (stderr, "%s must be a mono wav file!\n", argv[1]);
fclose (wavin);
return 1;
}
uint16_t blockalign;
fseek (wavin, 32, SEEK_SET);
fread (&blockalign, sizeof (uint16_t), 1, wavin);
if (blockalign != 2)
{
fprintf (stderr, "%s must be a 16-bit wav file!\n", argv[1]);
fclose (wavin);
return 1;
}
char data_tag[4] = { 0 };
fseek (wavin, 36, SEEK_SET);
do
{
if (fread (data_tag, 1, 4, wavin) != 4)
{
fprintf (stderr, "No data tag!!\n");
return 1;
}
if (!strncmp (data_tag, "data", 4))
{
break;
}
else
fseek (wavin, -3, SEEK_CUR);
}
while (1);
/* begin count numsamples */
uint32_t numsamples;
fread (&numsamples, sizeof (uint32_t), 1, wavin);
numsamples >>= 1;
printf ("numsamples: %d\n", numsamples);
/* end count numsamples */
pcmin = malloc (sizeof (int16_t) * numsamples);
pcmout = malloc (sizeof (int16_t) * numsamples);
fread (pcmin, sizeof (int16_t), numsamples, wavin);
fclose(wavin);
const double delta_x = 1.0 / 44100.0, c = 1900.0, h = 1.0;
v = malloc (sizeof (double *) * height);
u = malloc (sizeof (double *) * height);
assert (v != NULL && u != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
{
v[y] = malloc (sizeof (double) * width);
u[y] = malloc (sizeof (double) * width);
assert (u[y] != NULL && v[y] != NULL);
}
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
u[y][x] = 0.0; //init2d (x, y);
v[y][x] = 0.0;
}
png_frame = malloc (sizeof (png_byte *) * height);
assert (png_frame != NULL);
#pragma omp parallel for
for (int y = 0; y < height; y++)
assert ((png_frame[y] = malloc (4 * width)) != NULL);
/* This is where the simulation begins */
#pragma omp parallel for ordered schedule(dynamic)
for (uint32_t file = 0; file < (numsamples * 25) / 44100; file++)
{
char buff[50] = { 0 };
#pragma omp ordered
{
sprintf (buff, "tt-%03d.png", file);
printf ("\rWriting png frame: %s %d/%d... ", buff, file, ((numsamples * 25) / 44100) - 1);
fflush (stdout);
for (int i = 0; i < (int) (1.0 / (FPS * delta_x)); i++)
{
//int bb = printf ("%d/%d", i, (int) (1.0 / (FPS * delta_x)) - 1);
//fflush (stdout);
u[height / 2][width / 2] += (double) pcmin[pcm_ctr];
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
v[y][x] +=
delta_x * c * c * (u[((y - 1) < 0) ? 0 : y - 1][x] +
u[((y + 1) ==
height) ? height - 1 : y + 1][x] +
u[y][((x - 1) <
0) ? 0 : x - 1] + u[y][((x +
1) ==
width) ?
width -
1 : x +
1] -
(4.0 * u[y][x])) / (h * h);
}
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
{
u[y][x] += delta_x * v[y][x];
u[y][x] *= 0.999; // damp
}
pcmout[pcm_ctr] = (int16_t) u[(height/2) + 50][width / 2];
pcm_ctr++;
//for (int i = 0; i < bb; i++)
//putchar ('\b');
}
#pragma omp parallel for collapse(2)
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
write_heatmap (u[y][x], &png_frame[y][x * 4]);
}
png_frame[(height/2) + 50 ][(4*width/2)] = 255;
png_frame[(height/2) + 50 ][(4*width/2) + 1] = 0;
png_frame[(height/2) + 50 ][(4*width/2) + 2] = 0;
FILE *fpout = fopen (buff, "wb");
if (fpout == NULL)
{
perror (buff);
exit (1);;
}
png_structp png =
png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
assert (png != NULL);
png_infop info = png_create_info_struct (png);
assert (info != NULL);
if (setjmp (png_jmpbuf (png)))
abort ();
png_init_io (png, fpout);
// INDENT-OFF
png_set_IHDR (png,
info,
width, height,
8,
PNG_COLOR_TYPE_RGBA,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
// INDENT-ON
png_write_info (png, info);
write_wav ();
png_write_image (png, png_frame);
png_write_end (png, NULL);
fclose (fpout);
png_destroy_write_struct (&png, &info);
};
free (pcmin);
free (pcmout);
if (u != NULL)
for (int y = 0; y < height; y++)
free (u[y]);
if (v != NULL)
for (int y = 0; y < height; y++)
free (v[y]);
if (png_frame != NULL)
for (int y = 0; y < height; y++)
free (png_frame[y]);
free (png_frame);
free (u);
free (v);
puts ("done");
fflush (stdout);
return 0;
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment