swscale-example.c 7.19 KB
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/*
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 * Copyright (C) 2003 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of FFmpeg.
 *
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 * 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.
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 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <stdarg.h>

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#undef HAVE_AV_CONFIG_H
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#include "libavutil/avutil.h"
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#include "libavutil/lfg.h"
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#include "swscale.h"

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/* HACK Duplicated from swscale_internal.h.
 * Should be removed when a cleaner pixel format system exists. */
const char *sws_format_name(enum PixelFormat format);
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#define isGray(x)       (           \
           (x)==PIX_FMT_GRAY8       \
        || (x)==PIX_FMT_GRAY16BE    \
        || (x)==PIX_FMT_GRAY16LE    \
    )
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#define isALPHA(x)      (           \
           (x)==PIX_FMT_BGR32       \
        || (x)==PIX_FMT_BGR32_1     \
        || (x)==PIX_FMT_RGB32       \
        || (x)==PIX_FMT_RGB32_1     \
        || (x)==PIX_FMT_YUVA420P    \
    )
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static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1, int stride2, int w, int h){
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    int x,y;
    uint64_t ssd=0;
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//printf("%d %d\n", w, h);
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    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;
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//printf("%d", abs(src1[x + y*stride1] - src2[x + y*stride2])/26 );
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        }
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//printf("\n");
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    }
    return ssd;
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}

// test by ref -> src -> dst -> out & compare out against ref
// ref & out are YV12
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static int doTest(uint8_t *ref[4], int refStride[4], int w, int h, int srcFormat, int dstFormat,
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                  int srcW, int srcH, int dstW, int dstH, int flags){
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    uint8_t *src[4] = {0};
    uint8_t *dst[4] = {0};
    uint8_t *out[4] = {0};
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    int srcStride[4], dstStride[4];
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    int i;
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    uint64_t ssdY, ssdU=0, ssdV=0, ssdA=0;
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    struct SwsContext *srcContext = NULL, *dstContext = NULL,
                      *outContext = NULL;
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    int res;

    res = 0;
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    for (i=0; i<4; i++){
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        // avoid stride % bpp != 0
        if (srcFormat==PIX_FMT_RGB24 || srcFormat==PIX_FMT_BGR24)
            srcStride[i]= srcW*3;
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        else if (srcFormat==PIX_FMT_RGB48BE || srcFormat==PIX_FMT_RGB48LE)
            srcStride[i]= srcW*6;
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        else
            srcStride[i]= srcW*4;

        if (dstFormat==PIX_FMT_RGB24 || dstFormat==PIX_FMT_BGR24)
            dstStride[i]= dstW*3;
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        else if (dstFormat==PIX_FMT_RGB48BE || dstFormat==PIX_FMT_RGB48LE)
            dstStride[i]= dstW*6;
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        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);
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        if (!src[i] || !dst[i] || !out[i]) {
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            perror("Malloc");
            res = -1;

            goto end;
        }
    }

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    srcContext= sws_getContext(w, h, PIX_FMT_YUVA420P, srcW, srcH, srcFormat, flags, NULL, NULL, NULL);
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    if (!srcContext) {
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        fprintf(stderr, "Failed to get %s ---> %s\n",
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                sws_format_name(PIX_FMT_YUVA420P),
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                sws_format_name(srcFormat));
        res = -1;

        goto end;
    }
    dstContext= sws_getContext(srcW, srcH, srcFormat, dstW, dstH, dstFormat, flags, NULL, NULL, NULL);
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    if (!dstContext) {
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        fprintf(stderr, "Failed to get %s ---> %s\n",
                sws_format_name(srcFormat),
                sws_format_name(dstFormat));
        res = -1;

        goto end;
    }
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    outContext= sws_getContext(dstW, dstH, dstFormat, w, h, PIX_FMT_YUVA420P, flags, NULL, NULL, NULL);
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    if (!outContext) {
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        fprintf(stderr, "Failed to get %s ---> %s\n",
                sws_format_name(dstFormat),
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                sws_format_name(PIX_FMT_YUVA420P));
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        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);
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    ssdY= getSSD(ref[0], out[0], refStride[0], refStride[0], w, h);
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    if (!isGray(srcFormat) && !isGray(dstFormat)) {
        //FIXME check that output is really gray
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        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);
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    }
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    if (isALPHA(srcFormat) && isALPHA(dstFormat))
        ssdA= getSSD(ref[3], out[3], refStride[3], refStride[3], w, h);
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    ssdY/= w*h;
    ssdU/= w*h/4;
    ssdV/= w*h/4;
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    ssdA/= w*h;
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    printf(" %s %dx%d -> %s %4dx%4d flags=%2d SSD=%5"PRId64",%5"PRId64",%5"PRId64",%5"PRId64"\n",
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           sws_format_name(srcFormat), srcW, srcH,
           sws_format_name(dstFormat), dstW, dstH,
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           flags, ssdY, ssdU, ssdV, ssdA);
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    fflush(stdout);
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    end:
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    sws_freeContext(srcContext);
    sws_freeContext(dstContext);
    sws_freeContext(outContext);
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    for (i=0; i<4; i++){
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        free(src[i]);
        free(dst[i]);
        free(out[i]);
    }
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    return res;
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}

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static void selfTest(uint8_t *src[4], int stride[4], int w, int h){
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    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++) {
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            int res = 0;

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            printf("%s -> %s\n",
                   sws_format_name(srcFormat),
                   sws_format_name(dstFormat));
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            fflush(stdout);
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            srcW= w;
            srcH= h;
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            for (dstW=w - w/3; !res && dstW<= 4*w/3; dstW+= w/3)
                for (dstH=h - h/3; !res && dstH<= 4*h/3; dstH+= h/3)
                    for (flags=1; !res && flags<33; flags*=2)
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                        res = doTest(src, stride, w, h, srcFormat, dstFormat,
                                     srcW, srcH, dstW, dstH, flags);
        }
    }
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}

#define W 96
#define H 96

int main(int argc, char **argv){
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    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};
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    uint8_t *data = malloc (4*W*H);
    uint8_t *src[4]= {data, data+W*H, data+W*H*2, data+W*H*3};
    int stride[4]={W, W, W, W};
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    int x, y;
    struct SwsContext *sws;
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    AVLFG rand;
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    sws= sws_getContext(W/12, H/12, PIX_FMT_RGB32, W, H, PIX_FMT_YUVA420P, 2, NULL, NULL, NULL);
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    av_lfg_init(&rand, 1);

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    for (y=0; y<H; y++){
        for (x=0; x<W*4; x++){
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            rgb_data[ x + y*4*W]= av_lfg_get(&rand);
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        }
    }
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    sws_scale(sws, rgb_src, rgb_stride, 0, H, src, stride);
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    selfTest(src, stride, W, H);
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    return 0;
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}