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ffmpeg中sws_scale()用法實例

轉載自:http://blog.csdn.net/markman101/article/details/6415426

/*

*

* 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 <stdarg.h>

#undef HAVE_AV_CONFIG_H

#include "libavutil/avutil.h"

#include "swscale.h"

#include "swscale_internal.h"

static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1, int stride2, int w, int h){

int x,y;

uint64_t ssd=0;

//printf("%d %d/n", w, h);

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

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

int d= src1[x + y*stride1] - src2[x + y*stride2];

ssd+= d*d;

//printf("%d", abs(src1[x + y*stride1] - src2[x + y*stride2])/26 );

}

//printf("/n");

}

return ssd;

}

// test by ref -> src -> dst -> out & compare out against ref

// ref & out are YV12

static int doTest(uint8_t *ref[3], int refStride[3], int w, int h, int srcFormat, int dstFormat,

int srcW, int srcH, int dstW, int dstH, int flags){

uint8_t *src[3];

uint8_t *dst[3];

uint8_t *out[3];

int srcStride[3], dstStride[3];

int i;

uint64_t ssdY, ssdU, ssdV;

struct SwsContext *srcContext, *dstContext, *outContext;

int res;

res = 0;

for (i=0; i<3; i++){

// avoid stride % bpp != 0

if (srcFormat==PIX_FMT_RGB24 || srcFormat==PIX_FMT_BGR24)

srcStride[i]= srcW*3;

else

srcStride[i]= srcW*4;

if (dstFormat==PIX_FMT_RGB24 || dstFormat==PIX_FMT_BGR24)

dstStride[i]= dstW*3;

else

dstStride[i]= dstW*4;

src[i]= (uint8_t*) malloc(srcStride[i]*srcH);

dst[i]= (uint8_t*) malloc(dstStride[i]*dstH);

out[i]= (uint8_t*) malloc(refStride[i]*h);

if (!src[i] || !dst[i] || !out[i]) {

perror("Malloc");

res = -1;

goto end;

}

dstContext = outContext = NULL;

srcContext= sws_getContext(w, h, PIX_FMT_YUV420P, srcW, srcH, srcFormat, flags, NULL, NULL, NULL);

if (!srcContext) {

fprintf(stderr, "Failed to get %s ---> %s/n",

sws_format_name(PIX_FMT_YUV420P),

sws_format_name(srcFormat));

res = -1;

goto end;

}

dstContext= sws_getContext(srcW, srcH, srcFormat, dstW, dstH, dstFormat, flags, NULL, NULL, NULL);

if (!dstContext) {

fprintf(stderr, "Failed to get %s ---> %s/n",

sws_format_name(srcFormat),

sws_format_name(dstFormat));

res = -1;

goto end;

}

outContext= sws_getContext(dstW, dstH, dstFormat, w, h, PIX_FMT_YUV420P, flags, NULL, NULL, NULL);

if (!outContext) {

fprintf(stderr, "Failed to get %s ---> %s/n",

sws_format_name(dstFormat),

sws_format_name(PIX_FMT_YUV420P));

res = -1;

goto end;

}

// printf("test %X %X %X -> %X %X %X/n", (int)ref[0], (int)ref[1], (int)ref[2],

// (int)src[0], (int)src[1], (int)src[2]);

sws_scale(srcContext, ref, refStride, 0, h , src, srcStride);

sws_scale(dstContext, src, srcStride, 0, srcH, dst, dstStride);

sws_scale(outContext, dst, dstStride, 0, dstH, out, refStride);

ssdY= getSSD(ref[0], out[0], refStride[0], refStride[0], w, h);

ssdU= getSSD(ref[1], out[1], refStride[1], refStride[1], (w+1)>>1, (h+1)>>1);

ssdV= getSSD(ref[2], out[2], refStride[2], refStride[2], (w+1)>>1, (h+1)>>1);

if (srcFormat == PIX_FMT_GRAY8 || dstFormat==PIX_FMT_GRAY8) ssdU=ssdV=0; //FIXME check that output is really gray

ssdY/= w*h;

ssdU/= w*h/4;

ssdV/= w*h/4;

printf(" %s %dx%d -> %s %4dx%4d flags=%2d SSD=%5lld,%5lld,%5lld/n",

sws_format_name(srcFormat), srcW, srcH,

sws_format_name(dstFormat), dstW, dstH,

flags, ssdY, ssdU, ssdV);

fflush(stdout);

end:

sws_freeContext(srcContext);

sws_freeContext(dstContext);

sws_freeContext(outContext);

for (i=0; i<3; i++){

free(src[i]);

free(dst[i]);

free(out[i]);

}

return res;

}

static void selfTest(uint8_t *src[3], int stride[3], int w, int h){

enum PixelFormat srcFormat, dstFormat;

int srcW, srcH, dstW, dstH;

int flags;

for (srcFormat = 0; srcFormat < PIX_FMT_NB; srcFormat++) {

for (dstFormat = 0; dstFormat < PIX_FMT_NB; dstFormat++) {

printf("%s -> %s/n",

sws_format_name(srcFormat),

sws_format_name(dstFormat));

fflush(stdout);

srcW= w;

srcH= h;

for (dstW=w - w/3; dstW<= 4*w/3; dstW+= w/3){

for (dstH=h - h/3; dstH<= 4*h/3; dstH+= h/3){

for (flags=1; flags<33; flags*=2) {

int res;

res = doTest(src, stride, w, h, srcFormat, dstFormat,

srcW, srcH, dstW, dstH, flags);

if (res < 0) {

dstW = 4 * w / 3;

dstH = 4 * h / 3;

flags = 33;

}

#define W 96

#define H 96

int main(int argc, char **argv){

uint8_t *rgb_data = malloc (W*H*4);

uint8_t *rgb_src[3]= {rgb_data, NULL, NULL};

int rgb_stride[3]={4*W, 0, 0};

uint8_t *data = malloc (3*W*H);

uint8_t *src[3]= {data, data+W*H, data+W*H*2};

int stride[3]={W, W, W};

int x, y;

struct SwsContext *sws;

sws= sws_getContext(W/12, H/12, PIX_FMT_RGB32, W, H, PIX_FMT_YUV420P, 2, NULL, NULL, NULL);

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

for (x=0; x<W*4; x++){

rgb_data[ x + y*4*W]= random();

}

sws_scale(sws, rgb_src, rgb_stride, 0, H, src, stride);

selfTest(src, stride, W, H);

return 123;

}

posted on 2013-01-28 18:19 楊粼波閱讀(5662) 評論(0) 編輯收藏引用

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ffmpeg中sws_scale()用法實例