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ffmpeg / libswscale / swscale-example.c @ 9a034dde

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/*
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 * Copyright (C) 2003 Michael Niedermayer <michaelni@gmx.at>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * 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
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 * 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>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#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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#include "swscale_internal.h"
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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;
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    uint64_t ssd=0;
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//printf("%d %d\n", w, h);
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    for (y=0; y<h; y++){
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        for (x=0; x<w; x++){
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            int d= src1[x + y*stride1] - src2[x + y*stride2];
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            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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    }
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    return ssd;
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}
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// test by ref -> src -> dst -> out & compare out against ref
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// ref & out are YV12
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static int doTest(uint8_t *ref[3], int refStride[3], 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[3];
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    uint8_t *dst[3];
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    uint8_t *out[3];
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    int srcStride[3], dstStride[3];
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    int i;
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    uint64_t ssdY, ssdU, ssdV;
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    struct SwsContext *srcContext, *dstContext, *outContext;
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    int res;
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    res = 0;
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    for (i=0; i<3; i++){
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        // avoid stride % bpp != 0
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        if (srcFormat==PIX_FMT_RGB24 || srcFormat==PIX_FMT_BGR24)
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            srcStride[i]= srcW*3;
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        else
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            srcStride[i]= srcW*4;
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        if (dstFormat==PIX_FMT_RGB24 || dstFormat==PIX_FMT_BGR24)
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            dstStride[i]= dstW*3;
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        else
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            dstStride[i]= dstW*4;
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        src[i]= (uint8_t*) malloc(srcStride[i]*srcH);
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        dst[i]= (uint8_t*) malloc(dstStride[i]*dstH);
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        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");
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            res = -1;
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            goto end;
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        }
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    }
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    dstContext = outContext = NULL;
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    srcContext= sws_getContext(w, h, PIX_FMT_YUV420P, 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_YUV420P),
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                sws_format_name(srcFormat));
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        res = -1;
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        goto end;
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    }
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    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",
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                sws_format_name(srcFormat),
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                sws_format_name(dstFormat));
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        res = -1;
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        goto end;
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    }
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    outContext= sws_getContext(dstW, dstH, dstFormat, w, h, PIX_FMT_YUV420P, flags, NULL, NULL, NULL);
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    if (!outContext) {
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        fprintf(stderr, "Failed to get %s ---> %s\n",
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                sws_format_name(dstFormat),
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                sws_format_name(PIX_FMT_YUV420P));
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        res = -1;
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        goto end;
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    }
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//    printf("test %X %X %X -> %X %X %X\n", (int)ref[0], (int)ref[1], (int)ref[2],
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//        (int)src[0], (int)src[1], (int)src[2]);
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    sws_scale(srcContext, ref, refStride, 0, h   , src, srcStride);
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    sws_scale(dstContext, src, srcStride, 0, srcH, dst, dstStride);
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    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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    ssdU= getSSD(ref[1], out[1], refStride[1], refStride[1], (w+1)>>1, (h+1)>>1);
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    ssdV= getSSD(ref[2], out[2], refStride[2], refStride[2], (w+1)>>1, (h+1)>>1);
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    if (srcFormat == PIX_FMT_GRAY8 || dstFormat==PIX_FMT_GRAY8) ssdU=ssdV=0; //FIXME check that output is really gray
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    ssdY/= w*h;
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    ssdU/= w*h/4;
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    ssdV/= w*h/4;
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    printf(" %s %dx%d -> %s %4dx%4d flags=%2d SSD=%5lld,%5lld,%5lld\n",
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           sws_format_name(srcFormat), srcW, srcH,
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           sws_format_name(dstFormat), dstW, dstH,
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           flags, ssdY, ssdU, ssdV);
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    fflush(stdout);
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    end:
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    sws_freeContext(srcContext);
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    sws_freeContext(dstContext);
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    sws_freeContext(outContext);
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    for (i=0; i<3; i++){
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        free(src[i]);
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        free(dst[i]);
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        free(out[i]);
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    }
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    return res;
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}
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static void selfTest(uint8_t *src[3], int stride[3], int w, int h){
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    enum PixelFormat srcFormat, dstFormat;
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    int srcW, srcH, dstW, dstH;
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    int flags;
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    for (srcFormat = 0; srcFormat < PIX_FMT_NB; srcFormat++) {
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        for (dstFormat = 0; dstFormat < PIX_FMT_NB; dstFormat++) {
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            printf("%s -> %s\n",
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                   sws_format_name(srcFormat),
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                   sws_format_name(dstFormat));
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            fflush(stdout);
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            srcW= w;
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            srcH= h;
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            for (dstW=w - w/3; dstW<= 4*w/3; dstW+= w/3){
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                for (dstH=h - h/3; dstH<= 4*h/3; dstH+= h/3){
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                    for (flags=1; flags<33; flags*=2) {
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                        int res;
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                        res = doTest(src, stride, w, h, srcFormat, dstFormat,
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                                     srcW, srcH, dstW, dstH, flags);
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                        if (res < 0) {
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                            dstW = 4 * w / 3;
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                            dstH = 4 * h / 3;
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                            flags = 33;
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                        }
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                    }
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                }
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            }
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        }
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    }
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}
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#define W 96
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#define H 96
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int main(int argc, char **argv){
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    uint8_t *rgb_data = malloc (W*H*4);
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    uint8_t *rgb_src[3]= {rgb_data, NULL, NULL};
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    int rgb_stride[3]={4*W, 0, 0};
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    uint8_t *data = malloc (3*W*H);
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    uint8_t *src[3]= {data, data+W*H, data+W*H*2};
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    int stride[3]={W, W, W};
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    int x, y;
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    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_YUV420P, 2, NULL, NULL, NULL);
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    av_lfg_init(&rand, 1);
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    for (y=0; y<H; y++){
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        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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    }
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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 123;
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}