PeerStreamer

/*

 * Generates a synthetic YUV video sequence suitable for codec testing.

 *

 * copyright (c) Sebastien Bechet <s.bechet@av7.net>

 *

 * This file is part of Libav.

 *

 * Libav 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.

 *

 * Libav 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 Libav; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include <stdlib.h>

#include <stdio.h>

#include <inttypes.h>

#define FIXP (1 << 16)

#define MY_PI 205887 //(M_PI * FIX)

static int64_t int_pow(int64_t a, int p)

{

    int64_t v = FIXP;

    for (; p; p--) {

        v *= a;

        v /= FIXP;

    }

    return v;

}

static int64_t int_sin(int64_t a)

{

    if (a < 0)

        a = MY_PI - a;  // 0..inf

    a %= 2 * MY_PI;     // 0..2PI

    if (a >= MY_PI * 3 / 2)

        a -= 2 * MY_PI; // -PI / 2 .. 3PI / 2

    if (a >= MY_PI /2)

        a = MY_PI - a;  // -PI / 2 ..  PI / 2

    return a - int_pow(a, 3) / 6 + int_pow(a, 5) / 120 - int_pow(a, 7) / 5040;

}

#define SCALEBITS 8

#define ONE_HALF  (1 << (SCALEBITS - 1))

#define FIX(x)    ((int) ((x) * (1L << SCALEBITS) + 0.5))

static void rgb24_to_yuv420p(unsigned char *lum, unsigned char *cb,

                             unsigned char *cr, unsigned char *src,

                             int width, int height)

{

    int wrap, wrap3, x, y;

    int r, g, b, r1, g1, b1;

    unsigned char *p;

    wrap  = width;

    wrap3 = width * 3;

    p = src;

    for (y = 0; y < height; y += 2) {

        for (x = 0; x < width; x += 2) {

            r = p[0];

            g = p[1];

            b = p[2];

            r1 = r;

            g1 = g;

            b1 = b;

            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +

                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

            r = p[3];

            g = p[4];

            b = p[5];

            r1 += r;

            g1 += g;

            b1 += b;

            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +

                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

            p   += wrap3;

            lum += wrap;

            r = p[0];

            g = p[1];

            b = p[2];

            r1 += r;

            g1 += g;

            b1 += b;

            lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +

                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

            r = p[3];

            g = p[4];

            b = p[5];

            r1 += r;

            g1 += g;

            b1 += b;

            lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +

                      FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

            cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +

                      FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;

            cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -

                      FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;

            cb++;

            cr++;

            p   += -wrap3 + 2 * 3;

            lum += -wrap  + 2;

        }

        p   += wrap3;

        lum += wrap;

    }

}

/* cif format */

#define DEFAULT_WIDTH   352

#define DEFAULT_HEIGHT  288

#define DEFAULT_NB_PICT  50

static void pgmyuv_save(const char *filename, int w, int h,

                        unsigned char *rgb_tab)

{

    FILE *f;

    int i, h2, w2;

    unsigned char *cb, *cr;

    unsigned char *lum_tab, *cb_tab, *cr_tab;

    lum_tab = malloc(w * h);

    cb_tab  = malloc(w * h / 4);

    cr_tab  = malloc(w * h / 4);

    rgb24_to_yuv420p(lum_tab, cb_tab, cr_tab, rgb_tab, w, h);

    f = fopen(filename, "wb");

    fprintf(f, "P5\n%d %d\n%d\n", w, h * 3 / 2, 255);

    fwrite(lum_tab, 1, w * h, f);

    h2 = h / 2;

    w2 = w / 2;

    cb = cb_tab;

    cr = cr_tab;

    for (i = 0; i < h2; i++) {

        fwrite(cb, 1, w2, f);

        fwrite(cr, 1, w2, f);

        cb += w2;

        cr += w2;

    }

    fclose(f);

    free(lum_tab);

    free(cb_tab);

    free(cr_tab);

}

unsigned char *rgb_tab;

int width, height, wrap;

static void put_pixel(int x, int y, int r, int g, int b)

{

    unsigned char *p;

    if (x < 0 || x >= width ||

        y < 0 || y >= height)

        return;

    p = rgb_tab + y * wrap + x * 3;

    p[0] = r;

    p[1] = g;

    p[2] = b;

}

unsigned char tab_r[256 * 256];

unsigned char tab_g[256 * 256];

unsigned char tab_b[256 * 256];

int h_cos [360];

int h_sin [360];

static int ipol(uint8_t *src, int x, int y)

{

    int int_x  = x >> 16;

    int int_y  = y >> 16;

    int frac_x = x & 0xFFFF;

    int frac_y = y & 0xFFFF;

    int s00    = src[( int_x      & 255) + 256 * ( int_y      & 255)];

    int s01    = src[((int_x + 1) & 255) + 256 * ( int_y      & 255)];

    int s10    = src[( int_x      & 255) + 256 * ((int_y + 1) & 255)];

    int s11    = src[((int_x + 1) & 255) + 256 * ((int_y + 1) & 255)];

    int s0     = (((1 << 16) - frac_x) * s00 + frac_x * s01) >> 8;

    int s1     = (((1 << 16) - frac_x) * s10 + frac_x * s11) >> 8;

    return (((1 << 16) - frac_y) * s0 + frac_y * s1) >> 24;

}

static void gen_image(int num, int w, int h)

{

    const int c = h_cos [num % 360];

    const int s = h_sin [num % 360];

    const int xi = -(w / 2) * c;

    const int yi =  (w / 2) * s;

    const int xj = -(h / 2) * s;

    const int yj = -(h / 2) * c;

    int i, j;

    int x, y;

    int xprime = xj;

    int yprime = yj;

    for (j = 0; j < h; j++) {

        x = xprime + xi + FIXP * w / 2;

        xprime += s;

        y = yprime + yi + FIXP * h / 2;

        yprime += c;

        for (i = 0; i < w; i++ ) {

            x += c;

            y -= s;

            put_pixel(i, j, ipol(tab_r, x, y), ipol(tab_g, x, y), ipol(tab_b, x, y));

        }

    }

}

#define W 256

#define H 256

static int init_demo(const char *filename)

{

    int i, j;

    int h;

    int radian;

    char line[3 * W];

    FILE *input_file;

    input_file = fopen(filename, "rb");

    if (!input_file) {

        perror(filename);

        return 1;

    }

    if (fread(line, 1, 15, input_file) != 15)

        return 1;

    for (i = 0; i < H; i++) {

        if (fread(line, 1, 3 * W, input_file) != 3 * W)

            return 1;

        for (j = 0; j < W; j++) {

            tab_r[W * i + j] = line[3 * j    ];

            tab_g[W * i + j] = line[3 * j + 1];

            tab_b[W * i + j] = line[3 * j + 2];

        }

    }

    fclose(input_file);

    /* tables sin/cos */

    for (i = 0; i < 360; i++) {

        radian = 2 * i * MY_PI / 360;

        h      = 2 * FIXP + int_sin (radian);

        h_cos[i] = h * int_sin(radian + MY_PI / 2) / 2 / FIXP;

        h_sin[i] = h * int_sin(radian)             / 2 / FIXP;

    }

  return 0;

}

int main(int argc, char **argv)

{

    int w, h, i;

    char buf[1024];

    if (argc != 3) {

        printf("usage: %s directory/ image.pnm\n"

               "generate a test video stream\n", argv[0]);

        return 1;

    }

    w = DEFAULT_WIDTH;

    h = DEFAULT_HEIGHT;

    rgb_tab = malloc(w * h * 3);

    wrap    = w * 3;

    width   = w;

    height  = h;

    if (init_demo(argv[2]))

        return 1;

    for (i = 0; i < DEFAULT_NB_PICT; i++) {

        snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i);

        gen_image(i, w, h);

        pgmyuv_save(buf, w, h, rgb_tab);

    }

    free(rgb_tab);

    return 0;

}