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ffmpeg / libswscale / swscale-test.c @ a4fc3bd5

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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 "libavcore/imgutils.h"
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#include "libavutil/mem.h"
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#include "libavutil/avutil.h"
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#include "libavutil/pixdesc.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.
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 * Should be removed when a cleaner pixel format system exists. */
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#define isGray(x)       (           \
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           (x)==PIX_FMT_GRAY8       \
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        || (x)==PIX_FMT_GRAY16BE    \
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        || (x)==PIX_FMT_GRAY16LE    \
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    )
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#define hasChroma(x)   (!(          \
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            isGray(x)               \
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        || (x)==PIX_FMT_MONOBLACK   \
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        || (x)==PIX_FMT_MONOWHITE   \
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    ))
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#define isALPHA(x)      (           \
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           (x)==PIX_FMT_BGR32       \
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        || (x)==PIX_FMT_BGR32_1     \
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        || (x)==PIX_FMT_RGB32       \
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        || (x)==PIX_FMT_RGB32_1     \
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        || (x)==PIX_FMT_YUVA420P    \
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    )
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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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{
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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[4], int refStride[4], int w, int h,
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                  uint8_t *src[4], int srcStride[4],
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                  enum PixelFormat srcFormat, enum PixelFormat dstFormat,
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                  int srcW, int srcH, int dstW, int dstH, int flags)
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{
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    uint8_t *dst[4] = {0};
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    uint8_t *out[4] = {0};
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    int 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 *dstContext = NULL, *outContext = NULL;
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    int res = 0;
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    av_fill_image_linesizes(dstStride, dstFormat, dstW);
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    for (i=0; i<4; i++) {
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        /* Image buffers passed into libswscale can be allocated any way you
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         * prefer, as long as they're aligned enough for the architecture, and
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         * they're freed appropriately (such as using av_free for buffers
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         * allocated with av_malloc). */
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        /* An extra 16 bytes is being allocated because some scalers may write
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         * out of bounds. */
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        if (dstStride[i])
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            dst[i]= av_mallocz(dstStride[i]*dstH+16);
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        if (refStride[i])
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            out[i]= av_mallocz(refStride[i]*h);
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        if ((dstStride[i] && !dst[i]) || (refStride[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= 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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                av_pix_fmt_descriptors[srcFormat].name,
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                av_pix_fmt_descriptors[dstFormat].name);
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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_YUVA420P, 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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                av_pix_fmt_descriptors[dstFormat].name,
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                av_pix_fmt_descriptors[PIX_FMT_YUVA420P].name);
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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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    printf(" %s %dx%d -> %s %3dx%3d flags=%2d",
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           av_pix_fmt_descriptors[srcFormat].name, srcW, srcH,
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           av_pix_fmt_descriptors[dstFormat].name, dstW, dstH,
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           flags);
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    fflush(stdout);
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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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    if (hasChroma(srcFormat) && hasChroma(dstFormat)) {
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        //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);
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        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))
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        ssdA= getSSD(ref[3], out[3], refStride[3], refStride[3], w, h);
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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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    ssdA/= w*h;
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    printf(" SSD=%5"PRId64",%5"PRId64",%5"PRId64",%5"PRId64"\n",
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           ssdY, ssdU, ssdV, ssdA);
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end:
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    sws_freeContext(dstContext);
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    sws_freeContext(outContext);
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    for (i=0; i<4; i++) {
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        if (dstStride[i])
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            av_free(dst[i]);
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        if (refStride[i])
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            av_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 *ref[4], int refStride[4], int w, int h)
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{
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    const int flags[] = { SWS_FAST_BILINEAR,
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                          SWS_BILINEAR, SWS_BICUBIC,
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                          SWS_X       , SWS_POINT  , SWS_AREA, 0 };
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    const int srcW = w;
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    const int srcH = h;
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    const int dstW[] = { srcW - srcW/3, srcW, srcW + srcW/3, 0 };
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    const int dstH[] = { srcH - srcH/3, srcH, srcH + srcH/3, 0 };
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    enum PixelFormat srcFormat, dstFormat;
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    for (srcFormat = 0; srcFormat < PIX_FMT_NB; srcFormat++) {
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        if (!sws_isSupportedInput(srcFormat) || !sws_isSupportedOutput(srcFormat))
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            continue;
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        for (dstFormat = 0; dstFormat < PIX_FMT_NB; dstFormat++) {
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            int i, j, k;
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            int res = 0;
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            if (!sws_isSupportedInput(dstFormat) || !sws_isSupportedOutput(dstFormat))
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                continue;
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            printf("%s -> %s\n",
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                   av_pix_fmt_descriptors[srcFormat].name,
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                   av_pix_fmt_descriptors[dstFormat].name);
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            fflush(stdout);
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            for (k = 0; flags[k] && !res; k++) {
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                struct SwsContext *srcContext = NULL;
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                uint8_t *src[4] = {0};
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                int srcStride[4];
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                int p;
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                av_fill_image_linesizes(srcStride, srcFormat, srcW);
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                for (p = 0; p < 4; p++) {
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                    if (srcStride[p])
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                        src[p] = av_mallocz(srcStride[p]*srcH+16);
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                    if (srcStride[p] && !src[p]) {
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                        perror("Malloc");
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                        return;
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                    }
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                }
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                srcContext = sws_getContext(w, h, PIX_FMT_YUVA420P, srcW, srcH,
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                                            srcFormat, flags[k], 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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                            av_pix_fmt_descriptors[PIX_FMT_YUVA420P].name,
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                            av_pix_fmt_descriptors[srcFormat].name);
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                   return;
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                }
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                sws_scale(srcContext, ref, refStride, 0, h, src, srcStride);
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                for (i = 0; dstW[i] && !res; i++)
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                    for (j = 0; dstH[j] && !res; j++)
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                        res = doTest(ref, refStride, w, h, src, srcStride,
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                                     srcFormat, dstFormat,
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                                     srcW, srcH, dstW[i], dstH[j], flags[k]);
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                sws_freeContext(srcContext);
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                for (p = 0; p < 4; p++)
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                    if (srcStride[p])
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                        av_free(src[p]);
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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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{
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    uint8_t *rgb_data = av_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 = av_malloc (4*W*H);
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    uint8_t *src[4]= {data, data+W*H, data+W*H*2, data+W*H*3};
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    int stride[4]={W, 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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    if (!rgb_data || !data)
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        return -1;
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    sws= sws_getContext(W/12, H/12, PIX_FMT_RGB32, W, H, PIX_FMT_YUVA420P, SWS_BILINEAR, 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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    sws_freeContext(sws);
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    av_free(rgb_data);
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    selfTest(src, stride, W, H);
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    av_free(data);
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    return 0;
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}