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/*

 * Misc image conversion routines

 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard

 *

 * 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

 */

/**

 * @file

 * misc image conversion routines

 */

/* TODO:

 * - write 'ffimg' program to test all the image related stuff

 * - move all api to slice based system

 * - integrate deinterlacing, postprocessing and scaling in the conversion process

 */

#include "avcodec.h"

#include "dsputil.h"

#include "imgconvert.h"

#include "internal.h"

#include "libavutil/avassert.h"

#include "libavutil/colorspace.h"

#include "libavutil/common.h"

#include "libavutil/pixdesc.h"

#include "libavutil/imgutils.h"

#if HAVE_MMX_EXTERNAL

#include "x86/dsputil_x86.h"

#endif

#define FF_COLOR_NA      -1

#define FF_COLOR_RGB      0 /**< RGB color space */

#define FF_COLOR_GRAY     1 /**< gray color space */

#define FF_COLOR_YUV      2 /**< YUV color space. 16 <= Y <= 235, 16 <= U, V <= 240 */

#define FF_COLOR_YUV_JPEG 3 /**< YUV color space. 0 <= Y <= 255, 0 <= U, V <= 255 */

#if HAVE_MMX_EXTERNAL

#define deinterlace_line_inplace ff_deinterlace_line_inplace_mmx

#define deinterlace_line         ff_deinterlace_line_mmx

#else

#define deinterlace_line_inplace deinterlace_line_inplace_c

#define deinterlace_line         deinterlace_line_c

#endif

#define pixdesc_has_alpha(pixdesc) \

    ((pixdesc)->nb_components == 2 || (pixdesc)->nb_components == 4 || (pixdesc)->flags & AV_PIX_FMT_FLAG_PAL)

void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)

{

    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

    av_assert0(desc);

    *h_shift = desc->log2_chroma_w;

    *v_shift = desc->log2_chroma_h;

}

static int get_color_type(const AVPixFmtDescriptor *desc) {

    if (desc->flags & AV_PIX_FMT_FLAG_PAL)

        return FF_COLOR_RGB;

    if(desc->nb_components == 1 || desc->nb_components == 2)

        return FF_COLOR_GRAY;

    if(desc->name && !strncmp(desc->name, "yuvj", 4))

        return FF_COLOR_YUV_JPEG;

    if(desc->flags & AV_PIX_FMT_FLAG_RGB)

        return  FF_COLOR_RGB;

    if(desc->nb_components == 0)

        return FF_COLOR_NA;

    return FF_COLOR_YUV;

}

static int get_pix_fmt_depth(int *min, int *max, enum AVPixelFormat pix_fmt)

{

    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

    int i;

    if (!desc || !desc->nb_components) {

        *min = *max = 0;

        return AVERROR(EINVAL);

    }

    *min = INT_MAX, *max = -INT_MAX;

    for (i = 0; i < desc->nb_components; i++) {

        *min = FFMIN(desc->comp[i].depth_minus1+1, *min);

        *max = FFMAX(desc->comp[i].depth_minus1+1, *max);

    }

    return 0;

}

static int get_pix_fmt_score(enum AVPixelFormat dst_pix_fmt,

                              enum AVPixelFormat src_pix_fmt,

                              unsigned *lossp, unsigned consider)

{

    const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);

    const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);

    int src_color, dst_color;

    int src_min_depth, src_max_depth, dst_min_depth, dst_max_depth;

    int ret, loss, i, nb_components;

    int score = INT_MAX - 1;

    if (dst_pix_fmt >= AV_PIX_FMT_NB || dst_pix_fmt <= AV_PIX_FMT_NONE)

        return ~0;

    /* compute loss */

    *lossp = loss = 0;

    if (dst_pix_fmt == src_pix_fmt)

        return INT_MAX;

    if ((ret = get_pix_fmt_depth(&src_min_depth, &src_max_depth, src_pix_fmt)) < 0)

        return ret;

    if ((ret = get_pix_fmt_depth(&dst_min_depth, &dst_max_depth, dst_pix_fmt)) < 0)

        return ret;

    src_color = get_color_type(src_desc);

    dst_color = get_color_type(dst_desc);

    nb_components = FFMIN(src_desc->nb_components, dst_desc->nb_components);

    for (i = 0; i < nb_components; i++)

        if (src_desc->comp[i].depth_minus1 > dst_desc->comp[i].depth_minus1 && (consider & FF_LOSS_DEPTH)) {

            loss |= FF_LOSS_DEPTH;

            score -= 65536 >> dst_desc->comp[i].depth_minus1;

        }

    if (consider & FF_LOSS_RESOLUTION) {

        if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w) {

            loss |= FF_LOSS_RESOLUTION;

            score -= 256 << dst_desc->log2_chroma_w;

        }

        if (dst_desc->log2_chroma_h > src_desc->log2_chroma_h) {

            loss |= FF_LOSS_RESOLUTION;

            score -= 256 << dst_desc->log2_chroma_h;

        }

        // don't favor 422 over 420 if downsampling is needed, because 420 has much better support on the decoder side

        if (dst_desc->log2_chroma_w == 1 && src_desc->log2_chroma_w == 0 &&

            dst_desc->log2_chroma_h == 1 && src_desc->log2_chroma_h == 0 ) {

            score += 512;

        }

    }

    if(consider & FF_LOSS_COLORSPACE)

    switch(dst_color) {

    case FF_COLOR_RGB:

        if (src_color != FF_COLOR_RGB &&

            src_color != FF_COLOR_GRAY)

            loss |= FF_LOSS_COLORSPACE;

        break;

    case FF_COLOR_GRAY:

        if (src_color != FF_COLOR_GRAY)

            loss |= FF_LOSS_COLORSPACE;

        break;

    case FF_COLOR_YUV:

        if (src_color != FF_COLOR_YUV)

            loss |= FF_LOSS_COLORSPACE;

        break;

    case FF_COLOR_YUV_JPEG:

        if (src_color != FF_COLOR_YUV_JPEG &&

            src_color != FF_COLOR_YUV &&

            src_color != FF_COLOR_GRAY)

            loss |= FF_LOSS_COLORSPACE;

        break;

    default:

        /* fail safe test */

        if (src_color != dst_color)

            loss |= FF_LOSS_COLORSPACE;

        break;

    }

    if(loss & FF_LOSS_COLORSPACE)

        score -= (nb_components * 65536) >> FFMIN(dst_desc->comp[0].depth_minus1, src_desc->comp[0].depth_minus1);

    if (dst_color == FF_COLOR_GRAY &&

        src_color != FF_COLOR_GRAY && (consider & FF_LOSS_CHROMA)) {

        loss |= FF_LOSS_CHROMA;

        score -= 2 * 65536;

    }

    if (!pixdesc_has_alpha(dst_desc) && (pixdesc_has_alpha(src_desc) && (consider & FF_LOSS_ALPHA))) {

        loss |= FF_LOSS_ALPHA;

        score -= 65536;

    }

    if (dst_pix_fmt == AV_PIX_FMT_PAL8 && (consider & FF_LOSS_COLORQUANT) &&

        (src_pix_fmt != AV_PIX_FMT_PAL8 && (src_color != FF_COLOR_GRAY || (pixdesc_has_alpha(src_desc) && (consider & FF_LOSS_ALPHA))))) {

        loss |= FF_LOSS_COLORQUANT;

        score -= 65536;

    }

    *lossp = loss;

    return score;

}

int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,

                             enum AVPixelFormat src_pix_fmt,

                             int has_alpha)

{

    int loss;

    int ret = get_pix_fmt_score(dst_pix_fmt, src_pix_fmt, &loss, has_alpha ? ~0 : ~FF_LOSS_ALPHA);

    if (ret < 0)

        return ret;

    return loss;

}

enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,

                                            enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)

{

    enum AVPixelFormat dst_pix_fmt;

    int loss1, loss2, loss_mask;

    const AVPixFmtDescriptor *desc1 = av_pix_fmt_desc_get(dst_pix_fmt1);

    const AVPixFmtDescriptor *desc2 = av_pix_fmt_desc_get(dst_pix_fmt2);

    int score1, score2;

    loss_mask= loss_ptr?~*loss_ptr:~0; /* use loss mask if provided */

    if(!has_alpha)

        loss_mask &= ~FF_LOSS_ALPHA;

    dst_pix_fmt = AV_PIX_FMT_NONE;

    score1 = get_pix_fmt_score(dst_pix_fmt1, src_pix_fmt, &loss1, loss_mask);

    score2 = get_pix_fmt_score(dst_pix_fmt2, src_pix_fmt, &loss2, loss_mask);

    if (score1 == score2) {

        if(av_get_padded_bits_per_pixel(desc2) != av_get_padded_bits_per_pixel(desc1)) {

            dst_pix_fmt = av_get_padded_bits_per_pixel(desc2) < av_get_padded_bits_per_pixel(desc1) ? dst_pix_fmt2 : dst_pix_fmt1;

        } else {

            dst_pix_fmt = desc2->nb_components < desc1->nb_components ? dst_pix_fmt2 : dst_pix_fmt1;

        }

    } else {

        dst_pix_fmt = score1 < score2 ? dst_pix_fmt2 : dst_pix_fmt1;

    }

    if (loss_ptr)

        *loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);

    return dst_pix_fmt;

}

#if AV_HAVE_INCOMPATIBLE_LIBAV_ABI

enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,

                                            enum AVPixelFormat src_pix_fmt,

                                            int has_alpha, int *loss_ptr){

    return avcodec_find_best_pix_fmt_of_list(pix_fmt_list, src_pix_fmt, has_alpha, loss_ptr);

}

#else

enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,

                                            enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)

{

    return avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);

}

#endif

enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,

                                            enum AVPixelFormat src_pix_fmt,

                                            int has_alpha, int *loss_ptr){

    int i;

    enum AVPixelFormat best = AV_PIX_FMT_NONE;

    for(i=0; pix_fmt_list[i] != AV_PIX_FMT_NONE; i++)

        best = avcodec_find_best_pix_fmt_of_2(best, pix_fmt_list[i], src_pix_fmt, has_alpha, loss_ptr);

    return best;

}

/* 2x2 -> 1x1 */

void ff_shrink22(uint8_t *dst, int dst_wrap,

                     const uint8_t *src, int src_wrap,

                     int width, int height)

{

    int w;

    const uint8_t *s1, *s2;

    uint8_t *d;

    for(;height > 0; height--) {

        s1 = src;

        s2 = s1 + src_wrap;

        d = dst;

        for(w = width;w >= 4; w-=4) {

            d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;

            d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;

            d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;

            d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;

            s1 += 8;

            s2 += 8;

            d += 4;

        }

        for(;w > 0; w--) {

            d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;

            s1 += 2;

            s2 += 2;

            d++;

        }

        src += 2 * src_wrap;

        dst += dst_wrap;

    }

}

/* 4x4 -> 1x1 */

void ff_shrink44(uint8_t *dst, int dst_wrap,

                     const uint8_t *src, int src_wrap,

                     int width, int height)

{

    int w;

    const uint8_t *s1, *s2, *s3, *s4;

    uint8_t *d;

    for(;height > 0; height--) {

        s1 = src;

        s2 = s1 + src_wrap;

        s3 = s2 + src_wrap;

        s4 = s3 + src_wrap;

        d = dst;

        for(w = width;w > 0; w--) {

            d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +

                    s2[0] + s2[1] + s2[2] + s2[3] +

                    s3[0] + s3[1] + s3[2] + s3[3] +

                    s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;

            s1 += 4;

            s2 += 4;

            s3 += 4;

            s4 += 4;

            d++;

        }

        src += 4 * src_wrap;

        dst += dst_wrap;

    }

}

/* 8x8 -> 1x1 */

void ff_shrink88(uint8_t *dst, int dst_wrap,

                     const uint8_t *src, int src_wrap,

                     int width, int height)

{

    int w, i;

    for(;height > 0; height--) {

        for(w = width;w > 0; w--) {

            int tmp=0;

            for(i=0; i<8; i++){

                tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];

                src += src_wrap;

            }

            *(dst++) = (tmp + 32)>>6;

            src += 8 - 8*src_wrap;

        }

        src += 8*src_wrap - 8*width;

        dst += dst_wrap - width;

    }

}

/* return true if yuv planar */

static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)

{

    int i;

    int planes[4] = { 0 };

    if (     desc->flags & AV_PIX_FMT_FLAG_RGB

        || !(desc->flags & AV_PIX_FMT_FLAG_PLANAR))

        return 0;

    /* set the used planes */

    for (i = 0; i < desc->nb_components; i++)

        planes[desc->comp[i].plane] = 1;

    /* if there is an unused plane, the format is not planar */

    for (i = 0; i < desc->nb_components; i++)

        if (!planes[i])

            return 0;

    return 1;

}

int av_picture_crop(AVPicture *dst, const AVPicture *src,

                    enum AVPixelFormat pix_fmt, int top_band, int left_band)

{

    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

    int y_shift;

    int x_shift;

    if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

        return -1;

    y_shift = desc->log2_chroma_h;

    x_shift = desc->log2_chroma_w;

    if (is_yuv_planar(desc)) {

    dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;

    dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);

    dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);

    } else{

        if(top_band % (1<

            return -1;

        if(left_band) //FIXME add support for this too

            return -1;

        dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;

    }

    dst->linesize[0] = src->linesize[0];

    dst->linesize[1] = src->linesize[1];

    dst->linesize[2] = src->linesize[2];

    return 0;

}

int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,

                   enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,

            int *color)

{

    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

    uint8_t *optr;

    int y_shift;

    int x_shift;

    int yheight;

    int i, y;

    if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB ||

        !is_yuv_planar(desc)) return -1;

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

        x_shift = i ? desc->log2_chroma_w : 0;

        y_shift = i ? desc->log2_chroma_h : 0;

        if (padtop || padleft) {

            memset(dst->data[i], color[i],

                dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));

        }

        if (padleft || padright) {

            optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +

                (dst->linesize[i] - (padright >> x_shift));

            yheight = (height - 1 - (padtop + padbottom)) >> y_shift;

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

                memset(optr, color[i], (padleft + padright) >> x_shift);

                optr += dst->linesize[i];

            }

        }

        if (src) { /* first line */

            uint8_t *iptr = src->data[i];

            optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +

                    (padleft >> x_shift);

            memcpy(optr, iptr, (width - padleft - padright) >> x_shift);

            iptr += src->linesize[i];

            optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +

                (dst->linesize[i] - (padright >> x_shift));

            yheight = (height - 1 - (padtop + padbottom)) >> y_shift;

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

                memset(optr, color[i], (padleft + padright) >> x_shift);

                memcpy(optr + ((padleft + padright) >> x_shift), iptr,

                       (width - padleft - padright) >> x_shift);

                iptr += src->linesize[i];

                optr += dst->linesize[i];

            }

        }

        if (padbottom || padright) {

            optr = dst->data[i] + dst->linesize[i] *

                ((height - padbottom) >> y_shift) - (padright >> x_shift);

            memset(optr, color[i],dst->linesize[i] *

                (padbottom >> y_shift) + (padright >> x_shift));

        }

    }

    return 0;

}

#if FF_API_DEINTERLACE

#if !HAVE_MMX_EXTERNAL

/* filter parameters: [-1 4 2 4 -1] // 8 */

static void deinterlace_line_c(uint8_t *dst,

                             const uint8_t *lum_m4, const uint8_t *lum_m3,

                             const uint8_t *lum_m2, const uint8_t *lum_m1,

                             const uint8_t *lum,

                             int size)

{

    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

    int sum;

    for(;size > 0;size--) {

        sum = -lum_m4[0];

        sum += lum_m3[0] << 2;

        sum += lum_m2[0] << 1;

        sum += lum_m1[0] << 2;

        sum += -lum[0];

        dst[0] = cm[(sum + 4) >> 3];

        lum_m4++;

        lum_m3++;

        lum_m2++;

        lum_m1++;

        lum++;

        dst++;

    }

}

static void deinterlace_line_inplace_c(uint8_t *lum_m4, uint8_t *lum_m3,

                                       uint8_t *lum_m2, uint8_t *lum_m1,

                                       uint8_t *lum, int size)

{

    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

    int sum;

    for(;size > 0;size--) {

        sum = -lum_m4[0];

        sum += lum_m3[0] << 2;

        sum += lum_m2[0] << 1;

        lum_m4[0]=lum_m2[0];

        sum += lum_m1[0] << 2;

        sum += -lum[0];

        lum_m2[0] = cm[(sum + 4) >> 3];

        lum_m4++;

        lum_m3++;

        lum_m2++;

        lum_m1++;

        lum++;

    }

}

#endif /* !HAVE_MMX_EXTERNAL */

/* deinterlacing : 2 temporal taps, 3 spatial taps linear filter. The

   top field is copied as is, but the bottom field is deinterlaced

   against the top field. */

static void deinterlace_bottom_field(uint8_t *dst, int dst_wrap,

                                    const uint8_t *src1, int src_wrap,

                                    int width, int height)

{

    const uint8_t *src_m2, *src_m1, *src_0, *src_p1, *src_p2;

    int y;

    src_m2 = src1;

    src_m1 = src1;

    src_0=&src_m1[src_wrap];

    src_p1=&src_0[src_wrap];

    src_p2=&src_p1[src_wrap];

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

        memcpy(dst,src_m1,width);

        dst += dst_wrap;

        deinterlace_line(dst,src_m2,src_m1,src_0,src_p1,src_p2,width);

        src_m2 = src_0;

        src_m1 = src_p1;

        src_0 = src_p2;

        src_p1 += 2*src_wrap;

        src_p2 += 2*src_wrap;

        dst += dst_wrap;

    }

    memcpy(dst,src_m1,width);

    dst += dst_wrap;

    /* do last line */

    deinterlace_line(dst,src_m2,src_m1,src_0,src_0,src_0,width);

}

static void deinterlace_bottom_field_inplace(uint8_t *src1, int src_wrap,

                                             int width, int height)

{

    uint8_t *src_m1, *src_0, *src_p1, *src_p2;

    int y;

    uint8_t *buf;

    buf = av_malloc(width);

    src_m1 = src1;

    memcpy(buf,src_m1,width);

    src_0=&src_m1[src_wrap];

    src_p1=&src_0[src_wrap];

    src_p2=&src_p1[src_wrap];

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

        deinterlace_line_inplace(buf,src_m1,src_0,src_p1,src_p2,width);

        src_m1 = src_p1;

        src_0 = src_p2;

        src_p1 += 2*src_wrap;

        src_p2 += 2*src_wrap;

    }

    /* do last line */

    deinterlace_line_inplace(buf,src_m1,src_0,src_0,src_0,width);

    av_free(buf);

}

int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,

                          enum AVPixelFormat pix_fmt, int width, int height)

{

    int i;

    if (pix_fmt != AV_PIX_FMT_YUV420P &&

        pix_fmt != AV_PIX_FMT_YUVJ420P &&

        pix_fmt != AV_PIX_FMT_YUV422P &&

        pix_fmt != AV_PIX_FMT_YUVJ422P &&

        pix_fmt != AV_PIX_FMT_YUV444P &&

        pix_fmt != AV_PIX_FMT_YUV411P &&

        pix_fmt != AV_PIX_FMT_GRAY8)

        return -1;

    if ((width & 3) != 0 || (height & 3) != 0)

        return -1;

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

        if (i == 1) {

            switch(pix_fmt) {

            case AV_PIX_FMT_YUVJ420P:

            case AV_PIX_FMT_YUV420P:

                width >>= 1;

                height >>= 1;

                break;

            case AV_PIX_FMT_YUV422P:

            case AV_PIX_FMT_YUVJ422P:

                width >>= 1;

                break;

            case AV_PIX_FMT_YUV411P:

                width >>= 2;

                break;

            default:

                break;

            }

            if (pix_fmt == AV_PIX_FMT_GRAY8) {

                break;

            }

        }

        if (src == dst) {

            deinterlace_bottom_field_inplace(dst->data[i], dst->linesize[i],

                                 width, height);

        } else {

            deinterlace_bottom_field(dst->data[i],dst->linesize[i],

                                        src->data[i], src->linesize[i],

                                        width, height);

        }

    }

    emms_c();

    return 0;

}

#endif /* FF_API_DEINTERLACE */

#ifdef TEST

int main(void){

    int i;

    int err=0;

    int skip = 0;

    for (i=0; i

        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);

        if(!desc || !desc->name) {

            skip ++;

            continue;

        }

        if (skip) {

            av_log(NULL, AV_LOG_INFO, "%3d unused pixel format values\n", skip);

            skip = 0;

        }

        av_log(NULL, AV_LOG_INFO, "pix fmt %s yuv_plan:%d avg_bpp:%d colortype:%d\n", desc->name, is_yuv_planar(desc), av_get_padded_bits_per_pixel(desc), get_color_type(desc));

        if ((!(desc->flags & AV_PIX_FMT_FLAG_ALPHA)) != (desc->nb_components != 2 && desc->nb_components != 4)) {

            av_log(NULL, AV_LOG_ERROR, "Alpha flag mismatch\n");

            err = 1;

        }

    }

    return err;

}

#endif