FFmpeg/libavcodec/imgconvert.c

/*
 * Misc image convertion routines
 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
 *
 * This library 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 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/**
 * @file imgconvert.c
 * Misc image convertion 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"

#ifdef USE_FASTMEMCPY
#include "fastmemcpy.h"
#endif

#ifdef HAVE_MMX
#include "i386/mmx.h"
#endif

#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 */

typedef struct PixFmtInfo {
    const char *name;
    uint8_t nb_components;     /* number of components in AVPicture array  */
    uint8_t color_type;        /* color type (see FF_COLOR_xxx constants) */
    uint8_t is_packed : 1; /* true if multiple components in same word */
    uint8_t is_paletted : 1; /* true if paletted */
    uint8_t is_alpha : 1;    /* true if alpha can be specified */
    uint8_t x_chroma_shift; /* X chroma subsampling factor is 2 ^ shift */
    uint8_t y_chroma_shift; /* Y chroma subsampling factor is 2 ^ shift */
    uint8_t depth;          /* bit depth of the color components */
} PixFmtInfo;

/* this table gives more information about formats */
static PixFmtInfo pix_fmt_info[PIX_FMT_NB] = {
    /* YUV formats */
    [PIX_FMT_YUV420P] = {
        .name = "yuv420p",
        .nb_components = 3,
        .color_type = FF_COLOR_YUV,
        .depth = 8,
        .x_chroma_shift = 1, .y_chroma_shift = 1, 
    },
    [PIX_FMT_YUV422P] = {
        .name = "yuv422p",
        .nb_components = 3,
        .color_type = FF_COLOR_YUV,
        .depth = 8,
        .x_chroma_shift = 1, .y_chroma_shift = 0, 
    },
    [PIX_FMT_YUV444P] = {
        .name = "yuv444p",
        .nb_components = 3,
        .color_type = FF_COLOR_YUV,
        .depth = 8,
        .x_chroma_shift = 0, .y_chroma_shift = 0, 
    },
    [PIX_FMT_YUV422] = {
        .name = "yuv422",
        .nb_components = 1, .is_packed = 1,
        .color_type = FF_COLOR_YUV,
        .depth = 8,
        .x_chroma_shift = 1, .y_chroma_shift = 0,
    },
    [PIX_FMT_YUV410P] = {
        .name = "yuv410p",
        .nb_components = 3,
        .color_type = FF_COLOR_YUV,
        .depth = 8,
        .x_chroma_shift = 2, .y_chroma_shift = 2,
    },
    [PIX_FMT_YUV411P] = {
        .name = "yuv411p",
        .nb_components = 3,
        .color_type = FF_COLOR_YUV,
        .depth = 8,
        .x_chroma_shift = 2, .y_chroma_shift = 0,
    },

    /* JPEG YUV */
    [PIX_FMT_YUVJ420P] = {
        .name = "yuvj420p",
        .nb_components = 3,
        .color_type = FF_COLOR_YUV_JPEG,
        .depth = 8,
        .x_chroma_shift = 1, .y_chroma_shift = 1, 
    },
    [PIX_FMT_YUVJ422P] = {
        .name = "yuvj422p",
        .nb_components = 3,
        .color_type = FF_COLOR_YUV_JPEG,
        .depth = 8,
        .x_chroma_shift = 1, .y_chroma_shift = 0, 
    },
    [PIX_FMT_YUVJ444P] = {
        .name = "yuvj444p",
        .nb_components = 3,
        .color_type = FF_COLOR_YUV_JPEG,
        .depth = 8,
        .x_chroma_shift = 0, .y_chroma_shift = 0, 
    },

    /* RGB formats */
    [PIX_FMT_RGB24] = {
        .name = "rgb24",
        .nb_components = 1, .is_packed = 1,
        .color_type = FF_COLOR_RGB,
        .depth = 8,
    },
    [PIX_FMT_BGR24] = {
        .name = "bgr24",
        .nb_components = 1, .is_packed = 1,
        .color_type = FF_COLOR_RGB,
        .depth = 8,
    },
    [PIX_FMT_RGBA32] = {
        .name = "rgba32",
        .nb_components = 1, .is_packed = 1, .is_alpha = 1,
        .color_type = FF_COLOR_RGB,
        .depth = 8,
    },
    [PIX_FMT_RGB565] = {
        .name = "rgb565",
        .nb_components = 1, .is_packed = 1,
        .color_type = FF_COLOR_RGB,
        .depth = 5,
    },
    [PIX_FMT_RGB555] = {
        .name = "rgb555",
        .nb_components = 1, .is_packed = 1, .is_alpha = 1,
        .color_type = FF_COLOR_RGB,
        .depth = 5,
    },

    /* gray / mono formats */
    [PIX_FMT_GRAY8] = {
        .name = "gray",
        .nb_components = 1,
        .color_type = FF_COLOR_GRAY,
        .depth = 8,
    },
    [PIX_FMT_MONOWHITE] = {
        .name = "monow",
        .nb_components = 1,
        .color_type = FF_COLOR_GRAY,
        .depth = 1,
    },
    [PIX_FMT_MONOBLACK] = {
        .name = "monob",
        .nb_components = 1,
        .color_type = FF_COLOR_GRAY,
        .depth = 1,
    },

    /* paletted formats */
    [PIX_FMT_PAL8] = {
        .name = "pal8",
        .nb_components = 1, .is_packed = 1, .is_alpha = 1, .is_paletted = 1,
        .color_type = FF_COLOR_RGB,
        .depth = 8,
    },
};

void avcodec_get_chroma_sub_sample(int pix_fmt, int *h_shift, int *v_shift)
{
    *h_shift = pix_fmt_info[pix_fmt].x_chroma_shift;
    *v_shift = pix_fmt_info[pix_fmt].y_chroma_shift;
}

const char *avcodec_get_pix_fmt_name(int pix_fmt)
{
    if (pix_fmt < 0 || pix_fmt >= PIX_FMT_NB)
        return "???";
    else
        return pix_fmt_info[pix_fmt].name;
}

/* Picture field are filled with 'ptr' addresses. Also return size */
int avpicture_fill(AVPicture *picture, uint8_t *ptr,
                   int pix_fmt, int width, int height)
{
    int size, w2, h2, size2;
    PixFmtInfo *pinfo;
    
    pinfo = &pix_fmt_info[pix_fmt];
    size = width * height;
    switch(pix_fmt) {
    case PIX_FMT_YUV420P:
    case PIX_FMT_YUV422P:
    case PIX_FMT_YUV444P:
    case PIX_FMT_YUV410P:
    case PIX_FMT_YUV411P:
    case PIX_FMT_YUVJ420P:
    case PIX_FMT_YUVJ422P:
    case PIX_FMT_YUVJ444P:
        w2 = (width + (1 << pinfo->x_chroma_shift) - 1) >> pinfo->x_chroma_shift;
        h2 = (height + (1 << pinfo->y_chroma_shift) - 1) >> pinfo->y_chroma_shift;
        size2 = w2 * h2;
        picture->data[0] = ptr;
        picture->data[1] = picture->data[0] + size;
        picture->data[2] = picture->data[1] + size2;
        picture->linesize[0] = width;
        picture->linesize[1] = w2;
        picture->linesize[2] = w2;
        return size + 2 * size2;
    case PIX_FMT_RGB24:
    case PIX_FMT_BGR24:
        picture->data[0] = ptr;
        picture->data[1] = NULL;
        picture->data[2] = NULL;
        picture->linesize[0] = width * 3;
        return size * 3;
    case PIX_FMT_RGBA32:
        picture->data[0] = ptr;
        picture->data[1] = NULL;
        picture->data[2] = NULL;
        picture->linesize[0] = width * 4;
        return size * 4;
    case PIX_FMT_RGB555:
    case PIX_FMT_RGB565:
    case PIX_FMT_YUV422:
        picture->data[0] = ptr;
        picture->data[1] = NULL;
        picture->data[2] = NULL;
        picture->linesize[0] = width * 2;
        return size * 2;
    case PIX_FMT_GRAY8:
        picture->data[0] = ptr;
        picture->data[1] = NULL;
        picture->data[2] = NULL;
        picture->linesize[0] = width;
        return size;
    case PIX_FMT_MONOWHITE:
    case PIX_FMT_MONOBLACK:
        picture->data[0] = ptr;
        picture->data[1] = NULL;
        picture->data[2] = NULL;
        picture->linesize[0] = (width + 7) >> 3;
        return picture->linesize[0] * height;
    case PIX_FMT_PAL8:
        size2 = (size + 3) & ~3;
        picture->data[0] = ptr;
        picture->data[1] = ptr + size2; /* palette is stored here as 256 32 bit words */
        picture->data[2] = NULL;
        picture->linesize[0] = width;
        picture->linesize[1] = 4;
        return size2 + 256 * 4;
    default:
        picture->data[0] = NULL;
        picture->data[1] = NULL;
        picture->data[2] = NULL;
        picture->data[3] = NULL;
        return -1;
    }
}

int avpicture_get_size(int pix_fmt, int width, int height)
{
    AVPicture dummy_pict;
    return avpicture_fill(&dummy_pict, NULL, pix_fmt, width, height);
}

/**
 * compute the loss when converting from a pixel format to another 
 */
int avcodec_get_pix_fmt_loss(int dst_pix_fmt, int src_pix_fmt,
                             int has_alpha)
{
    const PixFmtInfo *pf, *ps;
    int loss;

    ps = &pix_fmt_info[src_pix_fmt];
    pf = &pix_fmt_info[dst_pix_fmt];

    /* compute loss */
    loss = 0;
    pf = &pix_fmt_info[dst_pix_fmt];
    if (pf->depth < ps->depth)
        loss |= FF_LOSS_DEPTH;
    if (pf->x_chroma_shift >= ps->x_chroma_shift ||
        pf->y_chroma_shift >= ps->y_chroma_shift)
        loss |= FF_LOSS_RESOLUTION;
    switch(pf->color_type) {
    case FF_COLOR_RGB:
        if (ps->color_type != FF_COLOR_RGB &&
            ps->color_type != FF_COLOR_GRAY)
            loss |= FF_LOSS_COLORSPACE;
        break;
    case FF_COLOR_GRAY:
        if (ps->color_type != FF_COLOR_GRAY)
            loss |= FF_LOSS_COLORSPACE;
        break;
    case FF_COLOR_YUV:
        if (ps->color_type != FF_COLOR_YUV)
            loss |= FF_LOSS_COLORSPACE;
        break;
    case FF_COLOR_YUV_JPEG:
        if (ps->color_type != FF_COLOR_YUV_JPEG &&
            ps->color_type != FF_COLOR_YUV)
            loss |= FF_LOSS_COLORSPACE;
        break;
    default:
        /* fail safe test */
        if (ps->color_type != pf->color_type)
            loss |= FF_LOSS_COLORSPACE;
        break;
    }
    if (pf->color_type == FF_COLOR_GRAY &&
        ps->color_type != FF_COLOR_GRAY)
        loss |= FF_LOSS_CHROMA;
    if (!pf->is_alpha && (ps->is_alpha && has_alpha))
        loss |= FF_LOSS_ALPHA;
    if (pf->is_paletted && (!ps->is_paletted && ps->color_type != FF_COLOR_GRAY))
        loss |= FF_LOSS_COLORQUANT;
    return loss;
}

static int avg_bits_per_pixel(int pix_fmt)
{
    int bits;
    const PixFmtInfo *pf;

    pf = &pix_fmt_info[pix_fmt];
    if (pf->is_packed) {
        switch(pix_fmt) {
        case PIX_FMT_RGB24:
        case PIX_FMT_BGR24:
            bits = 24;
            break;
        case PIX_FMT_RGBA32:
            bits = 32;
                        break;
        case PIX_FMT_RGB565:
        case PIX_FMT_RGB555:
            bits = 16;
                        break;
        case PIX_FMT_PAL8:
            bits = 8;
            break;
        default:
            bits = 32;
            break;
        }
    } else {
        bits = pf->depth;
        bits += (2 * pf->depth >> 
                 (pf->x_chroma_shift + pf->x_chroma_shift));
    }
    return bits;
}

static int avcodec_find_best_pix_fmt1(int pix_fmt_mask, 
                                      int src_pix_fmt,
                                      int has_alpha,
                                      int loss_mask)
{
    int dist, i, loss, min_dist, dst_pix_fmt;

    /* find exact color match with smallest size */
    dst_pix_fmt = -1;
    min_dist = 0x7fffffff;
    for(i = 0;i < PIX_FMT_NB; i++) {
        if (pix_fmt_mask & (1 << i)) {
            loss = avcodec_get_pix_fmt_loss(i, src_pix_fmt, has_alpha) & loss_mask;
            if (loss == 0) {
                dist = avg_bits_per_pixel(i);
                if (dist < min_dist) {
                    min_dist = dist;
                    dst_pix_fmt = i;
                }
            }
        }
    }
    return dst_pix_fmt;
}

/** 
 * find best pixel format to convert to. Return -1 if none found 
 */
int avcodec_find_best_pix_fmt(int pix_fmt_mask, int src_pix_fmt,
                              int has_alpha, int *loss_ptr)
{
    int dst_pix_fmt, loss_mask, i;
    static const int loss_mask_order[] = {
        ~0, /* no loss first */
        ~FF_LOSS_ALPHA,
        ~FF_LOSS_RESOLUTION,
        ~(FF_LOSS_COLORSPACE | FF_LOSS_RESOLUTION),
        ~FF_LOSS_COLORQUANT,
        ~FF_LOSS_DEPTH,
        0,
    };

    /* try with successive loss */
    i = 0;
    for(;;) {
        loss_mask = loss_mask_order[i++];
        dst_pix_fmt = avcodec_find_best_pix_fmt1(pix_fmt_mask, src_pix_fmt, 
                                                 has_alpha, loss_mask);
        if (dst_pix_fmt >= 0)
            goto found;
        if (loss_mask == 0)
            break;
    }
    return -1;
 found:
    if (loss_ptr)
        *loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
    return dst_pix_fmt;
}


/* XXX: totally non optimized */

static void yuv422_to_yuv420p(AVPicture *dst, AVPicture *src,
                              int width, int height)
{
    const uint8_t *p, *p1;
    uint8_t *lum, *cr, *cb, *lum1, *cr1, *cb1;
    int x;
 
    p1 = src->data[0];
    lum1 = dst->data[0];
    cb1 = dst->data[0];
    cr1 = dst->data[0];

    for(;height >= 2; height -= 2) {
        p = p1;
        lum = lum1;
        cb = cb1;
        cr = cr1;
        for(x=0;x<width;x+=2) {
            lum[0] = p[0];
            cb[0] = p[1];
            lum[1] = p[2];
            cr[0] = p[3];
            p += 4;
            lum += 2;
            cb++;
            cr++;
        }
        p1 += src->linesize[0];
        lum1 += dst->linesize[0];
        p = p1;
        lum = lum1;
        for(x=0;x<width;x+=2) {
            lum[0] = p[0];
            lum[1] = p[2];
            p += 4;
            lum += 2;
        }
        p1 += src->linesize[0];
        lum1 += dst->linesize[0];
        cb1 += dst->linesize[1];
        cr1 += dst->linesize[2];
    }
}

static void yuv422_to_yuv422p(AVPicture *dst, AVPicture *src,
                              int width, int height)
{
    const uint8_t *p, *p1;
    uint8_t *lum, *cr, *cb, *lum1, *cr1, *cb1;
    int w;

    p1 = src->data[0];
    lum1 = dst->data[0];
    cb1 = dst->data[0];
    cr1 = dst->data[0];
    for(;height >= 2; height -= 2) {
        p = p1;
        lum = lum1;
        cb = cb1;
        cr = cr1;
        for(w = width; w >= 2; w -= 2) {
            lum[0] = p[0];
            cb[0] = p[1];
            lum[1] = p[2];
            cr[0] = p[3];
            p += 4;
            lum += 2;
            cb++;
            cr++;
        }
        p1 += src->linesize[0];
        lum1 += dst->linesize[0];
        cb1 += dst->linesize[1];
        cr1 += dst->linesize[2];
    }
}

static void yuv422p_to_yuv422(AVPicture *dst, AVPicture *src,
                              int width, int height)
{
    uint8_t *p, *p1;
    const uint8_t *lum, *cr, *cb, *lum1, *cr1, *cb1;
    int w;

    p1 = dst->data[0];
    lum1 = src->data[0];
    cb1 = src->data[0];
    cr1 = src->data[0];
    for(;height >= 2; height -= 2) {
        p = p1;
        lum = lum1;
        cb = cb1;
        cr = cr1;
        for(w = width; w >= 2; w -= 2) {
            p[0] = lum[0];
            p[1] = cb[0];
            p[2] = lum[1];
            p[3] = cr[0];
            p += 4;
            lum += 2;
            cb++;
            cr++;
        }
        p1 += src->linesize[0];
        lum1 += dst->linesize[0];
        cb1 += dst->linesize[1];
        cr1 += dst->linesize[2];
    }
}

#define SCALEBITS 10
#define ONE_HALF  (1 << (SCALEBITS - 1))
#define FIX(x)	  ((int) ((x) * (1<<SCALEBITS) + 0.5))

#define YUV_TO_RGB1_CCIR(cb1, cr1)\
{\
    cb = (cb1) - 128;\
    cr = (cr1) - 128;\
    r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\
    g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \
            ONE_HALF;\
    b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
}

#define YUV_TO_RGB2_CCIR(r, g, b, y1)\
{\
    y = ((y1) - 16) * FIX(255.0/219.0);\
    r = cm[(y + r_add) >> SCALEBITS];\
    g = cm[(y + g_add) >> SCALEBITS];\
    b = cm[(y + b_add) >> SCALEBITS];\
}

#define YUV_TO_RGB1(cb1, cr1)\
{\
    cb = (cb1) - 128;\
    cr = (cr1) - 128;\
    r_add = FIX(1.40200) * cr + ONE_HALF;\
    g_add = - FIX(0.34414) * cb - FIX(0.71414) * cr + ONE_HALF;\
    b_add = FIX(1.77200) * cb + ONE_HALF;\
}

#define YUV_TO_RGB2(r, g, b, y1)\
{\
    y = (y1) << SCALEBITS;\
    r = cm[(y + r_add) >> SCALEBITS];\
    g = cm[(y + g_add) >> SCALEBITS];\
    b = cm[(y + b_add) >> SCALEBITS];\
}

#define Y_CCIR_TO_JPEG(y)\
 cm[((y) * FIX(255.0/219.0) + (ONE_HALF - 16 * FIX(255.0/219.0))) >> SCALEBITS]

#define Y_JPEG_TO_CCIR(y)\
 (((y) * FIX(219.0/255.0) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)

#define C_CCIR_TO_JPEG(y)\
 cm[(((y) - 128) * FIX(127.0/112.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS]

/* NOTE: the clamp is really necessary! */
#define C_JPEG_TO_CCIR(y)\
({\
    int __y;\
    __y = ((((y) - 128) * FIX(112.0/127.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS);\
    if (__y < 16)\
         __y = 16;\
    __y;\
})

#define RGB_TO_Y(r, g, b) \
((FIX(0.29900) * (r) + FIX(0.58700) * (g) + \
  FIX(0.11400) * (b) + ONE_HALF) >> SCALEBITS)

#define RGB_TO_U(r1, g1, b1, shift)\
(((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +         \
     FIX(0.50000) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)

#define RGB_TO_V(r1, g1, b1, shift)\
(((FIX(0.50000) * r1 - FIX(0.41869) * g1 -           \
   FIX(0.08131) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)

#define RGB_TO_Y_CCIR(r, g, b) \
((FIX(0.29900*219.0/255.0) * (r) + FIX(0.58700*219.0/255.0) * (g) + \
  FIX(0.11400*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)

#define RGB_TO_U_CCIR(r1, g1, b1, shift)\
(((- FIX(0.16874*224.0/255.0) * r1 - FIX(0.33126*224.0/255.0) * g1 +         \
     FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)

#define RGB_TO_V_CCIR(r1, g1, b1, shift)\
(((FIX(0.50000*224.0/255.0) * r1 - FIX(0.41869*224.0/255.0) * g1 -           \
   FIX(0.08131*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)

static uint8_t y_ccir_to_jpeg[256];
static uint8_t y_jpeg_to_ccir[256];
static uint8_t c_ccir_to_jpeg[256];
static uint8_t c_jpeg_to_ccir[256];

/* init various conversion tables */
static void img_convert_init(void)
{
    int i;
    uint8_t *cm = cropTbl + MAX_NEG_CROP;

    for(i = 0;i < 256; i++) {
        y_ccir_to_jpeg[i] = Y_CCIR_TO_JPEG(i);
        y_jpeg_to_ccir[i] = Y_JPEG_TO_CCIR(i);
        c_ccir_to_jpeg[i] = C_CCIR_TO_JPEG(i);
        c_jpeg_to_ccir[i] = C_JPEG_TO_CCIR(i);
    }
}

/* apply to each pixel the given table */
static void img_apply_table(uint8_t *dst, int dst_wrap, 
                            const uint8_t *src, int src_wrap,
                            int width, int height, const uint8_t *table1)
{
    int n;
    const uint8_t *s;
    uint8_t *d;
    const uint8_t *table;

    table = table1;
    for(;height > 0; height--) {
        s = src;
        d = dst;
        n = width;
        while (n >= 4) {
            d[0] = table[s[0]];
            d[1] = table[s[1]];
            d[2] = table[s[2]];
            d[3] = table[s[3]];
            d += 4;
            s += 4;
            n -= 4;
        }
        while (n > 0) {
            d[0] = table[s[0]];
            d++;
            s++;
            n--;
        }
        dst += dst_wrap;
        src += src_wrap;
    }
}

/* XXX: use generic filter ? */
/* 1x2 -> 1x1 */
static void shrink2(uint8_t *dst, int dst_wrap, 
                    uint8_t *src, int src_wrap,
                    int width, int height)
{
    int w;
    uint8_t *s1, *s2, *d;

    for(;height > 0; height--) {
        s1 = src;
        s2 = s1 + src_wrap;
        d = dst;
        for(w = width;w >= 4; w-=4) {
            d[0] = (s1[0] + s2[0]) >> 1;
            d[1] = (s1[1] + s2[1]) >> 1;
            d[2] = (s1[2] + s2[2]) >> 1;
            d[3] = (s1[3] + s2[3]) >> 1;
            s1 += 4;
            s2 += 4;
            d += 4;
        }
        for(;w > 0; w--) {
            d[0] = (s1[0] + s2[0]) >> 1;
            s1++;
            s2++;
            d++;
        }
        src += 2 * src_wrap;
        dst += dst_wrap;
    }
}

/* 2x2 -> 1x1 */
static void shrink22(uint8_t *dst, int dst_wrap, 
                     uint8_t *src, int src_wrap,
                     int width, int height)
{
    int w;
    uint8_t *s1, *s2, *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) >> 1;
            d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 1;
            d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 1;
            d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 1;
            s1 += 8;
            s2 += 8;
            d += 4;
        }
        for(;w > 0; w--) {
            d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 1;
            s1 += 2;
            s2 += 2;
            d++;
        }
        src += 2 * src_wrap;
        dst += dst_wrap;
    }
}

/* 1x1 -> 2x2 */
static void grow22(uint8_t *dst, int dst_wrap,
                     uint8_t *src, int src_wrap,
                     int width, int height)
{
    int w;
    uint8_t *s1, *d;

    for(;height > 0; height--) {
        s1 = src;
        d = dst;
        for(w = width;w >= 4; w-=4) {
            d[1] = d[0] = s1[0];
            d[3] = d[2] = s1[1];
            s1 += 2;
            d += 4;
        }
        for(;w > 0; w--) {
            d[0] = s1[0];
            s1 ++;
            d++;
        }
        if (height%2)
            src += src_wrap;
        dst += dst_wrap;
    }
}

/* 1x2 -> 2x1 */
static void conv411(uint8_t *dst, int dst_wrap, 
                    uint8_t *src, int src_wrap,
                    int width, int height)
{
    int w, c;
    uint8_t *s1, *s2, *d;

    width>>=1;

    for(;height > 0; height--) {
        s1 = src;
        s2 = src + src_wrap;
        d = dst;
        for(w = width;w > 0; w--) {
            c = (s1[0] + s2[0]) >> 1;
            d[0] = c;
            d[1] = c;
            s1++;
            s2++;
            d += 2;
        }
        src += src_wrap * 2;
        dst += dst_wrap;
    }
}

static void img_copy(uint8_t *dst, int dst_wrap, 
                     uint8_t *src, int src_wrap,
                     int width, int height)
{
    for(;height > 0; height--) {
        memcpy(dst, src, width);
        dst += dst_wrap;
        src += src_wrap;
    }
}

/* XXX: no chroma interpolating is done */
#define RGB_FUNCTIONS(rgb_name)                                         \
                                                                        \
static void yuv420p_to_ ## rgb_name (AVPicture *dst, AVPicture *src,    \
                                     int width, int height)             \
{                                                                       \
    uint8_t *y1_ptr, *y2_ptr, *cb_ptr, *cr_ptr, *d, *d1, *d2;             \
    int w, y, cb, cr, r_add, g_add, b_add, width2;                      \
    uint8_t *cm = cropTbl + MAX_NEG_CROP;                                 \
    unsigned int r, g, b;                                               \
                                                                        \
    d = dst->data[0];                                                   \
    y1_ptr = src->data[0];                                              \
    cb_ptr = src->data[1];                                              \
    cr_ptr = src->data[2];                                              \
    width2 = (width + 1) >> 1;                                          \
    for(;height >= 2; height -= 2) {                                    \
        d1 = d;                                                         \
        d2 = d + dst->linesize[0];                                      \
        y2_ptr = y1_ptr + src->linesize[0];                             \
        for(w = width; w >= 2; w -= 2) {                                \
            YUV_TO_RGB1_CCIR(cb_ptr[0], cr_ptr[0]);                     \
            /* output 4 pixels */                                       \
            YUV_TO_RGB2_CCIR(r, g, b, y1_ptr[0]);                       \
            RGB_OUT(d1, r, g, b);                                       \
                                                                        \
            YUV_TO_RGB2_CCIR(r, g, b, y1_ptr[1]);                       \
            RGB_OUT(d1 + BPP, r, g, b);                                 \
                                                                        \
            YUV_TO_RGB2_CCIR(r, g, b, y2_ptr[0]);                       \
            RGB_OUT(d2, r, g, b);                                       \
                                                                        \
            YUV_TO_RGB2_CCIR(r, g, b, y2_ptr[1]);                       \
            RGB_OUT(d2 + BPP, r, g, b);                                 \
                                                                        \
            d1 += 2 * BPP;                                              \
            d2 += 2 * BPP;                                              \
                                                                        \
            y1_ptr += 2;                                                \
            y2_ptr += 2;                                                \
            cb_ptr++;                                                   \
            cr_ptr++;                                                   \
        }                                                               \
        /* handle odd width */                                          \
        if (w) {                                                        \
            YUV_TO_RGB1_CCIR(cb_ptr[0], cr_ptr[0]);                     \
            YUV_TO_RGB2_CCIR(r, g, b, y1_ptr[0]);                       \
            RGB_OUT(d1, r, g, b);                                       \
                                                                        \
            YUV_TO_RGB2_CCIR(r, g, b, y2_ptr[0]);                       \
            RGB_OUT(d2, r, g, b);                                       \
            d1 += BPP;                                                  \
            d2 += BPP;                                                  \
            y1_ptr++;                                                   \
            y2_ptr++;                                                   \
            cb_ptr++;                                                   \
            cr_ptr++;                                                   \
        }                                                               \
        d += 2 * dst->linesize[0];                                      \
        y1_ptr += 2 * src->linesize[0] - width;                         \
        cb_ptr += src->linesize[1] - width2;                            \
        cr_ptr += src->linesize[2] - width2;                            \
    }                                                                   \
    /* handle odd height */                                             \
    if (height) {                                                       \
        d1 = d;                                                         \
        for(w = width; w >= 2; w -= 2) {                                \
            YUV_TO_RGB1_CCIR(cb_ptr[0], cr_ptr[0]);                     \
            /* output 2 pixels */                                       \
            YUV_TO_RGB2_CCIR(r, g, b, y1_ptr[0]);                       \
            RGB_OUT(d1, r, g, b);                                       \
                                                                        \
            YUV_TO_RGB2_CCIR(r, g, b, y1_ptr[1]);                       \
            RGB_OUT(d1 + BPP, r, g, b);                                 \
                                                                        \
            d1 += 2 * BPP;                                              \
                                                                        \
            y1_ptr += 2;                                                \
            cb_ptr++;                                                   \
            cr_ptr++;                                                   \
        }                                                               \
        /* handle width */                                              \
        if (w) {                                                        \
            YUV_TO_RGB1_CCIR(cb_ptr[0], cr_ptr[0]);                     \
            /* output 2 pixels */                                       \
            YUV_TO_RGB2_CCIR(r, g, b, y1_ptr[0]);                       \
            RGB_OUT(d1, r, g, b);                                       \
            d1 += BPP;                                                  \
                                                                        \
            y1_ptr++;                                                   \
            cb_ptr++;                                                   \
            cr_ptr++;                                                   \
        }                                                               \
    }                                                                   \
}                                                                       \
                                                                        \
static void yuvj420p_to_ ## rgb_name (AVPicture *dst, AVPicture *src,   \
                                     int width, int height)             \
{                                                                       \
    uint8_t *y1_ptr, *y2_ptr, *cb_ptr, *cr_ptr, *d, *d1, *d2;             \
    int w, y, cb, cr, r_add, g_add, b_add, width2;                      \
    uint8_t *cm = cropTbl + MAX_NEG_CROP;                                 \
    unsigned int r, g, b;                                               \
                                                                        \
    d = dst->data[0];                                                   \
    y1_ptr = src->data[0];                                              \
    cb_ptr = src->data[1];                                              \
    cr_ptr = src->data[2];                                              \
    width2 = (width + 1) >> 1;                                          \
    for(;height >= 2; height -= 2) {                                    \
        d1 = d;                                                         \
        d2 = d + dst->linesize[0];                                      \
        y2_ptr = y1_ptr + src->linesize[0];                             \
        for(w = width; w >= 2; w -= 2) {                                \
            YUV_TO_RGB1(cb_ptr[0], cr_ptr[0]);                     \
            /* output 4 pixels */                                       \
            YUV_TO_RGB2(r, g, b, y1_ptr[0]);                       \
            RGB_OUT(d1, r, g, b);                                       \
                                                                        \
            YUV_TO_RGB2(r, g, b, y1_ptr[1]);                       \
            RGB_OUT(d1 + BPP, r, g, b);                                 \
                                                                        \
            YUV_TO_RGB2(r, g, b, y2_ptr[0]);                       \
            RGB_OUT(d2, r, g, b);                                       \
                                                                        \
            YUV_TO_RGB2(r, g, b, y2_ptr[1]);                       \
            RGB_OUT(d2 + BPP, r, g, b);                                 \
                                                                        \
            d1 += 2 * BPP;                                              \
            d2 += 2 * BPP;                                              \
                                                                        \
            y1_ptr += 2;                                                \
            y2_ptr += 2;                                                \
            cb_ptr++;                                                   \
            cr_ptr++;                                                   \
        }                                                               \
        /* handle odd width */                                          \
        if (w) {                                                        \
            YUV_TO_RGB1(cb_ptr[0], cr_ptr[0]);                     \
            YUV_TO_RGB2(r, g, b, y1_ptr[0]);                       \
            RGB_OUT(d1, r, g, b);                                       \
                                                                        \
            YUV_TO_RGB2(r, g, b, y2_ptr[0]);                       \
            RGB_OUT(d2, r, g, b);                                       \
            d1 += BPP;                                                  \
            d2 += BPP;                                                  \
            y1_ptr++;                                                   \
            y2_ptr++;                                                   \
            cb_ptr++;                                                   \
            cr_ptr++;                                                   \
        }                                                               \
        d += 2 * dst->linesize[0];                                      \
        y1_ptr += 2 * src->linesize[0] - width;                         \
        cb_ptr += src->linesize[1] - width2;                            \
        cr_ptr += src->linesize[2] - width2;                            \
    }                                                                   \
    /* handle odd height */                                             \
    if (height) {                                                       \
        d1 = d;                                                         \
        for(w = width; w >= 2; w -= 2) {                                \
            YUV_TO_RGB1(cb_ptr[0], cr_ptr[0]);                     \
            /* output 2 pixels */                                       \
            YUV_TO_RGB2(r, g, b, y1_ptr[0]);                       \
            RGB_OUT(d1, r, g, b);                                       \
                                                                        \
            YUV_TO_RGB2(r, g, b, y1_ptr[1]);                       \
            RGB_OUT(d1 + BPP, r, g, b);                                 \
                                                                        \
            d1 += 2 * BPP;                                              \
                                                                        \
            y1_ptr += 2;                                                \
            cb_ptr++;                                                   \
            cr_ptr++;                                                   \
        }                                                               \
        /* handle width */                                              \
        if (w) {                                                        \
            YUV_TO_RGB1(cb_ptr[0], cr_ptr[0]);                     \
            /* output 2 pixels */                                       \
            YUV_TO_RGB2(r, g, b, y1_ptr[0]);                       \
            RGB_OUT(d1, r, g, b);                                       \
            d1 += BPP;                                                  \
                                                                        \
            y1_ptr++;                                                   \
            cb_ptr++;                                                   \
            cr_ptr++;                                                   \
        }                                                               \
    }                                                                   \
}                                                                       \
                                                                        \
static void rgb_name ## _to_yuv420p(AVPicture *dst, AVPicture *src,     \
                                    int width, int height)              \
{                                                                       \
    int wrap, wrap3, width2;                                      \
    int r, g, b, r1, g1, b1, w;                                         \
    uint8_t *lum, *cb, *cr;                                               \
    const uint8_t *p;                                                     \
                                                                        \
    lum = dst->data[0];                                                 \
    cb = dst->data[1];                                                  \
    cr = dst->data[2];                                                  \
                                                                        \
    width2 = (width + 1) >> 1;                                          \
    wrap = dst->linesize[0];                                            \
    wrap3 = src->linesize[0];                                           \
    p = src->data[0];                                                   \
    for(;height>=2;height -= 2) {                                       \
        for(w = width; w >= 2; w -= 2) {                                \
            RGB_IN(r, g, b, p);                                         \
            r1 = r;                                                     \
            g1 = g;                                                     \
            b1 = b;                                                     \
            lum[0] = RGB_TO_Y_CCIR(r, g, b);        \
\
            RGB_IN(r, g, b, p + BPP);                                   \
            r1 += r;                                                    \
            g1 += g;                                                    \
            b1 += b;                                                    \
            lum[1] = RGB_TO_Y_CCIR(r, g, b);        \
            p += wrap3;                                                 \
            lum += wrap;                                                \
                                                                        \
            RGB_IN(r, g, b, p);                                         \
            r1 += r;                                                    \
            g1 += g;                                                    \
            b1 += b;                                                    \
            lum[0] = RGB_TO_Y_CCIR(r, g, b);        \
\
            RGB_IN(r, g, b, p + BPP);                                   \
            r1 += r;                                                    \
            g1 += g;                                                    \
            b1 += b;                                                    \
            lum[1] = RGB_TO_Y_CCIR(r, g, b);        \
                                                                        \
            cb[0] = RGB_TO_U_CCIR(r1, g1, b1, 2);                         \
            cr[0] = RGB_TO_V_CCIR(r1, g1, b1, 2);                         \
                                                                        \
            cb++;                                                       \
            cr++;                                                       \
            p += -wrap3 + 2 * BPP;                                      \
            lum += -wrap + 2;                                           \
        }                                                               \
        if (w) {                                                        \
            RGB_IN(r, g, b, p);                                         \
            r1 = r;                                                     \
            g1 = g;                                                     \
            b1 = b;                                                     \
            lum[0] = RGB_TO_Y_CCIR(r, g, b);        \
            p += wrap3;                                                 \
            lum += wrap;                                                \
            RGB_IN(r, g, b, p);                                         \
            r1 += r;                                                    \
            g1 += g;                                                    \
            b1 += b;                                                    \
            lum[0] = RGB_TO_Y_CCIR(r, g, b);        \
            cb[0] = RGB_TO_U_CCIR(r1, g1, b1, 1);                         \
            cr[0] = RGB_TO_V_CCIR(r1, g1, b1, 1);                         \
            cb++;                                                       \
            cr++;                                                       \
            p += -wrap3 + BPP;                                      \
            lum += -wrap + 1;                                           \
        }                                                               \
        p += wrap3 + (wrap3 - width * BPP);                             \
        lum += wrap + (wrap - width);                                   \
        cb += dst->linesize[1] - width2;                             \
        cr += dst->linesize[2] - width2;                             \
    }                                                                   \
    /* handle odd height */                                             \
    if (height) {                                                       \
        for(w = width; w >= 2; w -= 2) {                                \
            RGB_IN(r, g, b, p);                                         \
            r1 = r;                                                     \
            g1 = g;                                                     \
            b1 = b;                                                     \
            lum[0] = RGB_TO_Y_CCIR(r, g, b);        \
\
            RGB_IN(r, g, b, p + BPP);                                   \
            r1 += r;                                                    \
            g1 += g;                                                    \
            b1 += b;                                                    \
            lum[1] = RGB_TO_Y_CCIR(r, g, b);        \
            cb[0] = RGB_TO_U_CCIR(r1, g1, b1, 1);                         \
            cr[0] = RGB_TO_V_CCIR(r1, g1, b1, 1);                         \
            cb++;                                                       \
            cr++;                                                       \
            p += 2 * BPP;\
           lum += 2;\
        }                                                               \
        if (w) {                                                        \
            RGB_IN(r, g, b, p);                                         \
            lum[0] = RGB_TO_Y_CCIR(r, g, b);        \
            cb[0] = RGB_TO_U_CCIR(r, g, b, 0);                         \
            cr[0] = RGB_TO_V_CCIR(r, g, b, 0);                         \
        }                                                               \
    }                                                                   \
}                                                                       \
                                                                        \
static void rgb_name ## _to_gray(AVPicture *dst, AVPicture *src,        \
                                 int width, int height)                 \
{                                                                       \
    const unsigned char *p;                                             \
    unsigned char *q;                                                   \
    int r, g, b, dst_wrap, src_wrap;                                    \
    int x, y;                                                           \
                                                                        \
    p = src->data[0];                                                   \
    src_wrap = src->linesize[0] - BPP * width;                          \
                                                                        \
    q = dst->data[0];                                                   \
    dst_wrap = dst->linesize[0] - width;                                \
                                                                        \
    for(y=0;y<height;y++) {                                             \
        for(x=0;x<width;x++) {                                          \
            RGB_IN(r, g, b, p);                                         \
            q[0] = RGB_TO_Y(r, g, b);          \
            q++;                                                        \
            p += BPP;                                                   \
        }                                                               \
        p += src_wrap;                                                  \
        q += dst_wrap;                                                  \
    }                                                                   \
}                                                                       \
                                                                        \
static void gray_to_ ## rgb_name(AVPicture *dst, AVPicture *src,        \
                                 int width, int height)                 \
{                                                                       \
    const unsigned char *p;                                             \
    unsigned char *q;                                                   \
    int r, dst_wrap, src_wrap;                                          \
    int x, y;                                                           \
                                                                        \
    p = src->data[0];                                                   \
    src_wrap = src->linesize[0] - width;                                \
                                                                        \
    q = dst->data[0];                                                   \
    dst_wrap = dst->linesize[0] - BPP * width;                          \
                                                                        \
    for(y=0;y<height;y++) {                                             \
        for(x=0;x<width;x++) {                                          \
            r = p[0];                                                   \
            RGB_OUT(q, r, r, r);                                        \
            q += BPP;                                                   \
            p ++;                                                       \
        }                                                               \
        p += src_wrap;                                                  \
        q += dst_wrap;                                                  \
    }                                                                   \
}                                                                       \
                                                                        \
static void pal8_to_ ## rgb_name(AVPicture *dst, AVPicture *src,        \
                                 int width, int height)                 \
{                                                                       \
    const unsigned char *p;                                             \
    unsigned char *q;                                                   \
    int r, g, b, dst_wrap, src_wrap;                                    \
    int x, y;                                                           \
    uint32_t v;\
    const uint32_t *palette;\
\
    p = src->data[0];                                                   \
    src_wrap = src->linesize[0] - width;                                \
    palette = (uint32_t *)src->data[1];\
                                                                        \
    q = dst->data[0];                                                   \
    dst_wrap = dst->linesize[0] - BPP * width;                          \
                                                                        \
    for(y=0;y<height;y++) {                                             \
        for(x=0;x<width;x++) {                                          \
            v = palette[p[0]];\
            r = (v >> 16) & 0xff;\
            g = (v >> 8) & 0xff;\
            b = (v) & 0xff;\
            RGB_OUT(q, r, g, b);                                        \
            q += BPP;                                                   \
            p ++;                                                       \
        }                                                               \
        p += src_wrap;                                                  \
        q += dst_wrap;                                                  \
    }                                                                   \
}

/* copy bit n to bits 0 ... n - 1 */
static inline unsigned int bitcopy_n(unsigned int a, int n)
{
    int mask;
    mask = (1 << n) - 1;
    return (a & (0xff & ~mask)) | ((-((a >> n) & 1)) & mask);
}

/* rgb555 handling */

#define RGB_IN(r, g, b, s)\
{\
    unsigned int v = ((const uint16_t *)(s))[0];\
    r = bitcopy_n(v >> (10 - 3), 3);\
    g = bitcopy_n(v >> (5 - 3), 3);\
    b = bitcopy_n(v << 3, 3);\
}

#define RGB_OUT(d, r, g, b)\
{\
    ((uint16_t *)(d))[0] = ((r >> 3) << 10) | ((g >> 3) << 5) | (b >> 3) | 0x8000;\
}

#define BPP 2

RGB_FUNCTIONS(rgb555)

#undef RGB_IN
#undef RGB_OUT
#undef BPP

/* rgb565 handling */

#define RGB_IN(r, g, b, s)\
{\
    unsigned int v = ((const uint16_t *)(s))[0];\
    r = bitcopy_n(v >> (11 - 3), 3);\
    g = bitcopy_n(v >> (5 - 2), 2);\
    b = bitcopy_n(v << 3, 3);\
}

#define RGB_OUT(d, r, g, b)\
{\
    ((uint16_t *)(d))[0] = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);\
}

#define BPP 2

RGB_FUNCTIONS(rgb565)

#undef RGB_IN
#undef RGB_OUT
#undef BPP

/* bgr24 handling */

#define RGB_IN(r, g, b, s)\
{\
    b = (s)[0];\
    g = (s)[1];\
    r = (s)[2];\
}

#define RGB_OUT(d, r, g, b)\
{\
    (d)[0] = b;\
    (d)[1] = g;\
    (d)[2] = r;\
}

#define BPP 3

RGB_FUNCTIONS(bgr24)

#undef RGB_IN
#undef RGB_OUT
#undef BPP

/* rgb24 handling */

#define RGB_IN(r, g, b, s)\
{\
    r = (s)[0];\
    g = (s)[1];\
    b = (s)[2];\
}

#define RGB_OUT(d, r, g, b)\
{\
    (d)[0] = r;\
    (d)[1] = g;\
    (d)[2] = b;\
}

#define BPP 3

RGB_FUNCTIONS(rgb24)

static void yuv444p_to_rgb24(AVPicture *dst, AVPicture *src,
                             int width, int height)
{
    uint8_t *y1_ptr, *cb_ptr, *cr_ptr, *d, *d1;
    int w, y, cb, cr, r_add, g_add, b_add;
    uint8_t *cm = cropTbl + MAX_NEG_CROP;
    unsigned int r, g, b;

    d = dst->data[0];
    y1_ptr = src->data[0];
    cb_ptr = src->data[1];
    cr_ptr = src->data[2];
    for(;height > 0; height --) {
        d1 = d;
        for(w = width; w > 0; w--) {
            YUV_TO_RGB1_CCIR(cb_ptr[0], cr_ptr[0]);

            YUV_TO_RGB2_CCIR(r, g, b, y1_ptr[0]);
            RGB_OUT(d1, r, g, b);
            d1 += BPP;

            y1_ptr++;
            cb_ptr++;
            cr_ptr++;
        }
        d += dst->linesize[0];
        y1_ptr += src->linesize[0] - width;
        cb_ptr += src->linesize[1] - width;
        cr_ptr += src->linesize[2] - width;
    }
}

static void yuvj444p_to_rgb24(AVPicture *dst, AVPicture *src,
                              int width, int height)
{
    uint8_t *y1_ptr, *cb_ptr, *cr_ptr, *d, *d1;
    int w, y, cb, cr, r_add, g_add, b_add;
    uint8_t *cm = cropTbl + MAX_NEG_CROP;
    unsigned int r, g, b;

    d = dst->data[0];
    y1_ptr = src->data[0];
    cb_ptr = src->data[1];
    cr_ptr = src->data[2];
    for(;height > 0; height --) {
        d1 = d;
        for(w = width; w > 0; w--) {
            YUV_TO_RGB1(cb_ptr[0], cr_ptr[0]);

            YUV_TO_RGB2(r, g, b, y1_ptr[0]);
            RGB_OUT(d1, r, g, b);
            d1 += BPP;

            y1_ptr++;
            cb_ptr++;
            cr_ptr++;
        }
        d += dst->linesize[0];
        y1_ptr += src->linesize[0] - width;
        cb_ptr += src->linesize[1] - width;
        cr_ptr += src->linesize[2] - width;
    }
}

static void rgb24_to_yuv444p(AVPicture *dst, AVPicture *src,
                             int width, int height)
{
    int src_wrap, x, y;
    int r, g, b;
    uint8_t *lum, *cb, *cr;
    const uint8_t *p;

    lum = dst->data[0];
    cb = dst->data[1];
    cr = dst->data[2];

    src_wrap = src->linesize[0] - width * BPP;
    p = src->data[0];
    for(y=0;y<height;y++) {
        for(x=0;x<width;x++) {
            RGB_IN(r, g, b, p);
            lum[0] = RGB_TO_Y_CCIR(r, g, b);
            cb[0] = RGB_TO_U_CCIR(r, g, b, 0);
            cr[0] = RGB_TO_V_CCIR(r, g, b, 0);
            cb++;
            cr++;
            lum++;
        }
        p += src_wrap;
        lum += dst->linesize[0] - width;
        cb += dst->linesize[1] - width;
        cr += dst->linesize[2] - width;
    }
}

static void rgb24_to_yuvj420p(AVPicture *dst, AVPicture *src,
                              int width, int height)
{
    int wrap, wrap3, width2;
    int r, g, b, r1, g1, b1, w;
    uint8_t *lum, *cb, *cr;
    const uint8_t *p;

    lum = dst->data[0];
    cb = dst->data[1];
    cr = dst->data[2];

    width2 = (width + 1) >> 1;
    wrap = dst->linesize[0];
    wrap3 = src->linesize[0];
    p = src->data[0];
    for(;height>=2;height -= 2) {
        for(w = width; w >= 2; w -= 2) {
            RGB_IN(r, g, b, p);
            r1 = r;
            g1 = g;
            b1 = b;
            lum[0] = RGB_TO_Y(r, g, b);

            RGB_IN(r, g, b, p + BPP);
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = RGB_TO_Y(r, g, b);
            p += wrap3;
            lum += wrap;

            RGB_IN(r, g, b, p);
            r1 += r;
            g1 += g;
            b1 += b;
            lum[0] = RGB_TO_Y(r, g, b);

            RGB_IN(r, g, b, p + BPP);
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = RGB_TO_Y(r, g, b);

            cb[0] = RGB_TO_U(r1, g1, b1, 2);
            cr[0] = RGB_TO_V(r1, g1, b1, 2);

            cb++;
            cr++;
            p += -wrap3 + 2 * BPP;
            lum += -wrap + 2;
        }
        if (w) {
            RGB_IN(r, g, b, p);
            r1 = r;
            g1 = g;
            b1 = b;
            lum[0] = RGB_TO_Y(r, g, b);
            p += wrap3;
            lum += wrap;
            RGB_IN(r, g, b, p);
            r1 += r;
            g1 += g;
            b1 += b;
            lum[0] = RGB_TO_Y(r, g, b);
            cb[0] = RGB_TO_U(r1, g1, b1, 1);
            cr[0] = RGB_TO_V(r1, g1, b1, 1);
            cb++;
            cr++;
            p += -wrap3 + BPP;
            lum += -wrap + 1;
        }
        p += wrap3 + (wrap3 - width * BPP);
        lum += wrap + (wrap - width);
        cb += dst->linesize[1] - width2;
        cr += dst->linesize[2] - width2;
    }
    /* handle odd height */
    if (height) {
        for(w = width; w >= 2; w -= 2) {
            RGB_IN(r, g, b, p);
            r1 = r;
            g1 = g;
            b1 = b;
            lum[0] = RGB_TO_Y(r, g, b);

            RGB_IN(r, g, b, p + BPP);
            r1 += r;
            g1 += g;
            b1 += b;
            lum[1] = RGB_TO_Y(r, g, b);
            cb[0] = RGB_TO_U(r1, g1, b1, 1);
            cr[0] = RGB_TO_V(r1, g1, b1, 1);
            cb++;
            cr++;
            p += 2 * BPP;
           lum += 2;
        }
        if (w) {
            RGB_IN(r, g, b, p);
            lum[0] = RGB_TO_Y(r, g, b);
            cb[0] = RGB_TO_U(r, g, b, 0);
            cr[0] = RGB_TO_V(r, g, b, 0);
        }
    }
}

static void rgb24_to_yuvj444p(AVPicture *dst, AVPicture *src,
                              int width, int height)
{
    int src_wrap, x, y;
    int r, g, b;
    uint8_t *lum, *cb, *cr;
    const uint8_t *p;

    lum = dst->data[0];
    cb = dst->data[1];
    cr = dst->data[2];

    src_wrap = src->linesize[0] - width * BPP;
    p = src->data[0];
    for(y=0;y<height;y++) {
        for(x=0;x<width;x++) {
            RGB_IN(r, g, b, p);
            lum[0] = RGB_TO_Y(r, g, b);
            cb[0] = RGB_TO_U(r, g, b, 0);
            cr[0] = RGB_TO_V(r, g, b, 0);
            cb++;
            cr++;
            lum++;
        }
        p += src_wrap;
        lum += dst->linesize[0] - width;
        cb += dst->linesize[1] - width;
        cr += dst->linesize[2] - width;
    }
}

#undef RGB_IN
#undef RGB_OUT
#undef BPP

/* rgba32 handling */

#define RGB_IN(r, g, b, s)\
{\
    unsigned int v = ((const uint32_t *)(s))[0];\
    r = (v >> 16) & 0xff;\
    g = (v >> 8) & 0xff;\
    b = v & 0xff;\
}

#define RGB_OUT(d, r, g, b)\
{\
    ((uint32_t *)(d))[0] = (0xff << 24) | (r << 16) | (g << 8) | b;\
}

#define BPP 4

RGB_FUNCTIONS(rgba32)

#undef RGB_IN
#undef RGB_OUT
#undef BPP


static void rgb24_to_rgb565(AVPicture *dst, AVPicture *src,
                            int width, int height)
{
    const unsigned char *p;
    unsigned char *q;
    int r, g, b, dst_wrap, src_wrap;
    int x, y;

    p = src->data[0];
    src_wrap = src->linesize[0] - 3 * width;

    q = dst->data[0];
    dst_wrap = dst->linesize[0] - 2 * width;

    for(y=0;y<height;y++) {
        for(x=0;x<width;x++) {
            r = p[0];
            g = p[1];
            b = p[2];

            ((unsigned short *)q)[0] = 
                ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
            q += 2;
            p += 3;
        }
        p += src_wrap;
        q += dst_wrap;
    }
}

/* NOTE: we also add a dummy alpha bit */
static void rgb24_to_rgb555(AVPicture *dst, AVPicture *src,
                            int width, int height)
{
    const unsigned char *p;
    unsigned char *q;
    int r, g, b, dst_wrap, src_wrap;
    int x, y;

    p = src->data[0];
    src_wrap = src->linesize[0] - 3 * width;

    q = dst->data[0];
    dst_wrap = dst->linesize[0] - 2 * width;

    for(y=0;y<height;y++) {
        for(x=0;x<width;x++) {
            r = p[0];
            g = p[1];
            b = p[2];

            ((unsigned short *)q)[0] = 
                ((r >> 3) << 10) | ((g >> 3) << 5) | (b >> 3) | 0x8000;
            q += 2;
            p += 3;
        }
        p += src_wrap;
        q += dst_wrap;
    }
}

static void mono_to_gray(AVPicture *dst, AVPicture *src,
                         int width, int height, int xor_mask)
{
    const unsigned char *p;
    unsigned char *q;
    int v, dst_wrap, src_wrap;
    int y, w;

    p = src->data[0];
    src_wrap = src->linesize[0] - ((width + 7) >> 3);

    q = dst->data[0];
    dst_wrap = dst->linesize[0] - width;
    for(y=0;y<height;y++) {
        w = width; 
        while (w >= 8) {
            v = *p++ ^ xor_mask;
            q[0] = -(v >> 7);
            q[1] = -((v >> 6) & 1);
            q[2] = -((v >> 5) & 1);
            q[3] = -((v >> 4) & 1);
            q[4] = -((v >> 3) & 1);
            q[5] = -((v >> 2) & 1);
            q[6] = -((v >> 1) & 1);
            q[7] = -((v >> 0) & 1);
            w -= 8;
            q += 8;
        }
        if (w > 0) {
            v = *p++ ^ xor_mask;
            do {
                q[0] = -((v >> 7) & 1);
                q++;
                v <<= 1;
            } while (--w);
        }
        p += src_wrap;
        q += dst_wrap;
    }
}

static void monowhite_to_gray(AVPicture *dst, AVPicture *src,
                               int width, int height)
{
    mono_to_gray(dst, src, width, height, 0xff);
}

static void monoblack_to_gray(AVPicture *dst, AVPicture *src,
                               int width, int height)
{
    mono_to_gray(dst, src, width, height, 0x00);
}

static void gray_to_mono(AVPicture *dst, AVPicture *src,
                         int width, int height, int xor_mask)
{
    int n;
    const uint8_t *s;
    uint8_t *d;
    int j, b, v, n1, src_wrap, dst_wrap, y;

    s = src->data[0];
    src_wrap = src->linesize[0] - width;

    d = dst->data[0];
    dst_wrap = dst->linesize[0] - ((width + 7) >> 3);

    for(y=0;y<height;y++) {
        n = width;
        while (n >= 8) {
            v = 0;
            for(j=0;j<8;j++) {
                b = s[0];
                s++;
                v = (v << 1) | (b >> 7);
            }
            d[0] = v ^ xor_mask;
            d++;
            n -= 8;
        }
        if (n > 0) {
            n1 = n;
            v = 0;
            while (n > 0) {
                b = s[0];
                s++;
                v = (v << 1) | (b >> 7);
                n--;
            }
            d[0] = (v << (8 - (n1 & 7))) ^ xor_mask;
            d++;
        }
        s += src_wrap;
        d += dst_wrap;
    }
}

static void gray_to_monowhite(AVPicture *dst, AVPicture *src,
                              int width, int height)
{
    gray_to_mono(dst, src, width, height, 0xff);
}

static void gray_to_monoblack(AVPicture *dst, AVPicture *src,
                              int width, int height)
{
    gray_to_mono(dst, src, width, height, 0x00);
}

/* this is maybe slow, but allows for extensions */
static inline unsigned char gif_clut_index(uint8_t r, uint8_t g, uint8_t b)
{
    return ((((r)/47)%6)*6*6+(((g)/47)%6)*6+(((b)/47)%6));
}

/* XXX: put jpeg quantize code instead */
static void rgb24_to_pal8(AVPicture *dst, AVPicture *src,
                          int width, int height)
{
    const unsigned char *p;
    unsigned char *q;
    int r, g, b, dst_wrap, src_wrap;
    int x, y, i;
    static const uint8_t pal_value[6] = { 0x00, 0x33, 0x66, 0x99, 0xcc, 0xff };
    uint32_t *pal;

    p = src->data[0];
    src_wrap = src->linesize[0] - 3 * width;

    q = dst->data[0];
    dst_wrap = dst->linesize[0] - width;

    for(y=0;y<height;y++) {
        for(x=0;x<width;x++) {
            r = p[0];
            g = p[1];
            b = p[2];

            q[0] = gif_clut_index(r, g, b);
            q++;
            p += 3;
        }
        p += src_wrap;
        q += dst_wrap;
    }

    /* build palette */
    pal = (uint32_t *)dst->data[1];
    i = 0;
    for(r = 0; r < 6; r++) {
        for(g = 0; g < 6; g++) {
            for(b = 0; b < 6; b++) {
                pal[i++] = (0xff << 24) | (pal_value[r] << 16) | 
                    (pal_value[g] << 8) | pal_value[b];
            }
        }
    }
    while (i < 256)
        pal[i++] = 0;
}
        
static void rgba32_to_rgb24(AVPicture *dst, AVPicture *src,
                            int width, int height)
{
    const uint8_t *s;
    uint8_t *d;
    int src_wrap, dst_wrap, j, y;
    unsigned int v;

    s = src->data[0];
    src_wrap = src->linesize[0] - width * 4;

    d = dst->data[0];
    dst_wrap = dst->linesize[0] - width * 3;

    for(y=0;y<height;y++) {
        for(j = 0;j < width; j++) {
            v = *(uint32_t *)s;
            s += 4;
            d[0] = v >> 16;
            d[1] = v >> 8;
            d[2] = v;
            d += 3;
        }
        s += src_wrap;
        d += dst_wrap;
    }
}

typedef struct ConvertEntry {
    void (*convert)(AVPicture *dst, AVPicture *src, int width, int height);
} ConvertEntry;

/* Add each new convertion function in this table. In order to be able
   to convert from any format to any format, the following constraints
   must be satisfied:

   - all FF_COLOR_RGB formats must convert to and from PIX_FMT_RGB24 

   - all FF_COLOR_GRAY formats must convert to and from PIX_FMT_GRAY8

   - all FF_COLOR_RGB formats with alpha must convert to and from PIX_FMT_RGBA32

   - all PIX_FMT_YUV444P and PIX_FMT_YUVJ444P must convert to and from
     PIX_FMT_RGB24.

   - PIX_FMT_422 must convert to and from PIX_FMT_422P.
*/
static ConvertEntry convert_table[PIX_FMT_NB][PIX_FMT_NB] = {
    [PIX_FMT_YUV420P] = {
        [PIX_FMT_RGB555] = { 
            .convert = yuv420p_to_rgb555
        },
        [PIX_FMT_RGB565] = { 
            .convert = yuv420p_to_rgb565
        },
        [PIX_FMT_BGR24] = { 
            .convert = yuv420p_to_bgr24
        },
        [PIX_FMT_RGB24] = { 
            .convert = yuv420p_to_rgb24
        },
        [PIX_FMT_RGBA32] = { 
            .convert = yuv420p_to_rgba32
        },
    },
    [PIX_FMT_YUV422P] = { 
        [PIX_FMT_YUV422] = { 
            .convert = yuv422p_to_yuv422,
        },
    },
    [PIX_FMT_YUV444P] = { 
        [PIX_FMT_RGB24] = { 
            .convert = yuv444p_to_rgb24
        },
    },
    [PIX_FMT_YUVJ420P] = {
        [PIX_FMT_RGB555] = { 
            .convert = yuvj420p_to_rgb555
        },
        [PIX_FMT_RGB565] = { 
            .convert = yuvj420p_to_rgb565
        },
        [PIX_FMT_BGR24] = { 
            .convert = yuvj420p_to_bgr24
        },
        [PIX_FMT_RGB24] = { 
            .convert = yuvj420p_to_rgb24
        },
        [PIX_FMT_RGBA32] = { 
            .convert = yuvj420p_to_rgba32
        },
    },
    [PIX_FMT_YUVJ444P] = { 
        [PIX_FMT_RGB24] = { 
            .convert = yuvj444p_to_rgb24
        },
    },
    [PIX_FMT_YUV422] = { 
        [PIX_FMT_YUV420P] = { 
            .convert = yuv422_to_yuv420p,
        },
        [PIX_FMT_YUV422P] = { 
            .convert = yuv422_to_yuv422p,
        },
    },

    [PIX_FMT_RGB24] = {
        [PIX_FMT_YUV420P] = { 
            .convert = rgb24_to_yuv420p
        },
        [PIX_FMT_RGB565] = { 
            .convert = rgb24_to_rgb565
        },
        [PIX_FMT_RGB555] = { 
            .convert = rgb24_to_rgb555
        },
        [PIX_FMT_GRAY8] = { 
            .convert = rgb24_to_gray
        },
        [PIX_FMT_PAL8] = { 
            .convert = rgb24_to_pal8
        },
        [PIX_FMT_YUV444P] = { 
            .convert = rgb24_to_yuv444p
        },
        [PIX_FMT_YUVJ420P] = { 
            .convert = rgb24_to_yuvj420p
        },
        [PIX_FMT_YUVJ444P] = { 
            .convert = rgb24_to_yuvj444p
        },
    },
    [PIX_FMT_RGBA32] = {
        [PIX_FMT_YUV420P] = { 
            .convert = rgba32_to_yuv420p
        },
        [PIX_FMT_GRAY8] = { 
            .convert = rgba32_to_gray
        },
        [PIX_FMT_RGB24] = { 
            .convert = rgba32_to_rgb24
        },
    },
    [PIX_FMT_BGR24] = {
        [PIX_FMT_YUV420P] = { 
            .convert = bgr24_to_yuv420p
        },
        [PIX_FMT_GRAY8] = { 
            .convert = bgr24_to_gray
        },
    },
    [PIX_FMT_RGB555] = {
        [PIX_FMT_YUV420P] = { 
            .convert = rgb555_to_yuv420p
        },
        [PIX_FMT_GRAY8] = { 
            .convert = rgb555_to_gray
        },
    },
    [PIX_FMT_RGB565] = {
        [PIX_FMT_YUV420P] = { 
            .convert = rgb565_to_yuv420p
        },
        [PIX_FMT_GRAY8] = { 
            .convert = rgb565_to_gray
        },
    },
    [PIX_FMT_GRAY8] = {
        [PIX_FMT_RGB555] = { 
            .convert = gray_to_rgb555
        },
        [PIX_FMT_RGB565] = { 
            .convert = gray_to_rgb565
        },
        [PIX_FMT_RGB24] = { 
            .convert = gray_to_rgb24
        },
        [PIX_FMT_BGR24] = { 
            .convert = gray_to_bgr24
        },
        [PIX_FMT_RGBA32] = { 
            .convert = gray_to_rgba32
        },
        [PIX_FMT_MONOWHITE] = { 
            .convert = gray_to_monowhite
        },
        [PIX_FMT_MONOBLACK] = { 
            .convert = gray_to_monoblack
        },
    },
    [PIX_FMT_MONOWHITE] = {
        [PIX_FMT_GRAY8] = { 
            .convert = monowhite_to_gray
        },
    },
    [PIX_FMT_MONOBLACK] = {
        [PIX_FMT_GRAY8] = { 
            .convert = monoblack_to_gray
        },
    },
    [PIX_FMT_PAL8] = {
        [PIX_FMT_RGB555] = { 
            .convert = pal8_to_rgb555
        },
        [PIX_FMT_RGB565] = { 
            .convert = pal8_to_rgb565
        },
        [PIX_FMT_BGR24] = { 
            .convert = pal8_to_bgr24
        },
        [PIX_FMT_RGB24] = { 
            .convert = pal8_to_rgb24
        },
        [PIX_FMT_RGBA32] = { 
            .convert = pal8_to_rgba32
        },
    },
};

static int avpicture_alloc(AVPicture *picture,
                           int pix_fmt, int width, int height)
{
    unsigned int size;
    void *ptr;

    size = avpicture_get_size(pix_fmt, width, height);
    if (size < 0)
        goto fail;
    ptr = av_malloc(size);
    if (!ptr)
        goto fail;
    avpicture_fill(picture, ptr, pix_fmt, width, height);
    return 0;
 fail:
    memset(picture, 0, sizeof(AVPicture));
    return -1;
}

static void avpicture_free(AVPicture *picture)
{
    av_free(picture->data[0]);
}

/* return true if yuv planar */
static inline int is_yuv_planar(PixFmtInfo *ps)
{
    return (ps->color_type == FF_COLOR_YUV ||
            ps->color_type == FF_COLOR_YUV_JPEG) && !ps->is_packed;
}

/* XXX: always use linesize. Return -1 if not supported */
int img_convert(AVPicture *dst, int dst_pix_fmt,
                AVPicture *src, int src_pix_fmt, 
                int src_width, int src_height)
{
    static int inited;
    int i, ret, dst_width, dst_height, int_pix_fmt;
    PixFmtInfo *src_pix, *dst_pix;
    ConvertEntry *ce;
    AVPicture tmp1, *tmp = &tmp1;

    if (src_pix_fmt < 0 || src_pix_fmt >= PIX_FMT_NB ||
        dst_pix_fmt < 0 || dst_pix_fmt >= PIX_FMT_NB)
        return -1;
    if (src_width <= 0 || src_height <= 0)
        return 0;

    if (!inited) {
        inited = 1;
        img_convert_init();
    }

    dst_width = src_width;
    dst_height = src_height;

    dst_pix = &pix_fmt_info[dst_pix_fmt];
    src_pix = &pix_fmt_info[src_pix_fmt];
    if (src_pix_fmt == dst_pix_fmt) {
        /* XXX: incorrect */
        /* same format: just copy */
        for(i = 0; i < dst_pix->nb_components; i++) {
            int w, h;
            w = dst_width;
            h = dst_height;
            if (is_yuv_planar(dst_pix) && (i == 1 || i == 2)) {
                w >>= dst_pix->x_chroma_shift;
                h >>= dst_pix->y_chroma_shift;
            }
            img_copy(dst->data[i], dst->linesize[i],
                     src->data[i], src->linesize[i],
                     w, h);
        }
        return 0;
    }

    ce = &convert_table[src_pix_fmt][dst_pix_fmt];
    if (ce->convert) {
        /* specific convertion routine */
        ce->convert(dst, src, dst_width, dst_height);
        return 0;
    }

    /* gray to YUV */
    if (is_yuv_planar(dst_pix) &&
        src_pix_fmt == PIX_FMT_GRAY8) {
        int w, h, y;
        uint8_t *d;

        if (dst_pix->color_type == FF_COLOR_YUV_JPEG) {
            img_copy(dst->data[0], dst->linesize[0],
                     src->data[0], src->linesize[0],
                     dst_width, dst_height);
        } else {
            img_apply_table(dst->data[0], dst->linesize[0],
                            src->data[0], src->linesize[0],
                            dst_width, dst_height,
                            y_jpeg_to_ccir);
        }
        /* fill U and V with 128 */
        w = dst_width;
        h = dst_height;
        w >>= dst_pix->x_chroma_shift;
        h >>= dst_pix->y_chroma_shift;
        for(i = 1; i <= 2; i++) {
            d = dst->data[i];
            for(y = 0; y< h; y++) {
                memset(d, 128, w);
                d += dst->linesize[i];
            }
        }
        return 0;
    }

    /* YUV to gray */
    if (is_yuv_planar(src_pix) && 
        dst_pix_fmt == PIX_FMT_GRAY8) {
        if (src_pix->color_type == FF_COLOR_YUV_JPEG) {
            img_copy(dst->data[0], dst->linesize[0],
                     src->data[0], src->linesize[0],
                     dst_width, dst_height);
        } else {
            img_apply_table(dst->data[0], dst->linesize[0],
                            src->data[0], src->linesize[0],
                            dst_width, dst_height,
                            y_ccir_to_jpeg);
        }
        return 0;
    }

    /* YUV to YUV planar */
    if (is_yuv_planar(dst_pix) && is_yuv_planar(src_pix)) {
        int x_shift, y_shift, w, h;
        void (*resize_func)(uint8_t *dst, int dst_wrap, 
                            uint8_t *src, int src_wrap,
                            int width, int height);

        /* compute chroma size of the smallest dimensions */
        w = dst_width;
        h = dst_height;
        if (dst_pix->x_chroma_shift >= src_pix->x_chroma_shift)
            w >>= dst_pix->x_chroma_shift;
        else
            w >>= src_pix->x_chroma_shift;
        if (dst_pix->y_chroma_shift >= src_pix->y_chroma_shift)
            h >>= dst_pix->y_chroma_shift;
        else
            h >>= src_pix->y_chroma_shift;

        x_shift = (dst_pix->x_chroma_shift - src_pix->x_chroma_shift);
        y_shift = (dst_pix->y_chroma_shift - src_pix->y_chroma_shift);

        if (x_shift == 0 && y_shift == 0) {
            resize_func = img_copy;
        } else if (x_shift == 0 && y_shift == 1) {
            resize_func = shrink2;
        } else if (x_shift == 1 && y_shift == 1) {
            resize_func = shrink22;
        } else if (x_shift == -1 && y_shift == -1) {
            resize_func = grow22;
        } else if (x_shift == -1 && y_shift == 1) {
            resize_func = conv411;
        } else {
            /* currently not handled */
            return -1;
        }

        img_copy(dst->data[0], dst->linesize[0],
                 src->data[0], src->linesize[0],
                 dst_width, dst_height);

        for(i = 1;i <= 2; i++)
            resize_func(dst->data[i], dst->linesize[i],
                        src->data[i], src->linesize[i],
                        dst_width>>dst_pix->x_chroma_shift, dst_height>>dst_pix->y_chroma_shift);
        /* if yuv color space conversion is needed, we do it here on
           the destination image */
        if (dst_pix->color_type != src_pix->color_type) {
            const uint8_t *y_table, *c_table;
            if (dst_pix->color_type == FF_COLOR_YUV) {
                y_table = y_jpeg_to_ccir;
                c_table = c_jpeg_to_ccir;
            } else {
                y_table = y_ccir_to_jpeg;
                c_table = c_ccir_to_jpeg;
            }
            img_apply_table(dst->data[0], dst->linesize[0],
                            dst->data[0], dst->linesize[0],
                            dst_width, dst_height,
                            y_table);

            for(i = 1;i <= 2; i++)
                img_apply_table(dst->data[i], dst->linesize[i],
                                dst->data[i], dst->linesize[i],
                                dst_width>>dst_pix->x_chroma_shift, 
                                dst_height>>dst_pix->y_chroma_shift,
                                c_table);
        }
        return 0;
    }

    /* try to use an intermediate format */
    if (src_pix_fmt == PIX_FMT_YUV422 ||
        dst_pix_fmt == PIX_FMT_YUV422) {
        /* specific case: convert to YUV422P first */
        int_pix_fmt = PIX_FMT_YUV422P;
    } else if ((src_pix->color_type == FF_COLOR_GRAY &&
                src_pix_fmt != PIX_FMT_GRAY8) || 
               (dst_pix->color_type == FF_COLOR_GRAY &&
                dst_pix_fmt != PIX_FMT_GRAY8)) {
        /* gray8 is the normalized format */
        int_pix_fmt = PIX_FMT_GRAY8;
    } else if ((is_yuv_planar(src_pix) && 
                src_pix_fmt != PIX_FMT_YUV444P &&
                src_pix_fmt != PIX_FMT_YUVJ444P)) {
        /* yuv444 is the normalized format */
        if (src_pix->color_type == FF_COLOR_YUV_JPEG)
            int_pix_fmt = PIX_FMT_YUVJ444P;
        else
            int_pix_fmt = PIX_FMT_YUV444P;
    } else if ((is_yuv_planar(dst_pix) && 
                dst_pix_fmt != PIX_FMT_YUV444P &&
                dst_pix_fmt != PIX_FMT_YUVJ444P)) {
        /* yuv444 is the normalized format */
        if (dst_pix->color_type == FF_COLOR_YUV_JPEG)
            int_pix_fmt = PIX_FMT_YUVJ444P;
        else
            int_pix_fmt = PIX_FMT_YUV444P;
    } else {
        /* the two formats are rgb or gray8 or yuv[j]444p */
        if (src_pix->is_alpha && dst_pix->is_alpha)
            int_pix_fmt = PIX_FMT_RGBA32;
        else
            int_pix_fmt = PIX_FMT_RGB24;
    }
    if (avpicture_alloc(tmp, int_pix_fmt, dst_width, dst_height) < 0)
        return -1;
    ret = -1;
    if (img_convert(tmp, int_pix_fmt,
                    src, src_pix_fmt, src_width, src_height) < 0)
        goto fail1;
    if (img_convert(dst, dst_pix_fmt,
                    tmp, int_pix_fmt, dst_width, dst_height) < 0)
        goto fail1;
    ret = 0;
 fail1:
    avpicture_free(tmp);
    return ret;
}


#ifdef HAVE_MMX
#define DEINT_INPLACE_LINE_LUM \
                    movd_m2r(lum_m4[0],mm0);\
                    movd_m2r(lum_m3[0],mm1);\
                    movd_m2r(lum_m2[0],mm2);\
                    movd_m2r(lum_m1[0],mm3);\
                    movd_m2r(lum[0],mm4);\
                    punpcklbw_r2r(mm7,mm0);\
                    movd_r2m(mm2,lum_m4[0]);\
                    punpcklbw_r2r(mm7,mm1);\
                    punpcklbw_r2r(mm7,mm2);\
                    punpcklbw_r2r(mm7,mm3);\
                    punpcklbw_r2r(mm7,mm4);\
                    paddw_r2r(mm3,mm1);\
                    psllw_i2r(1,mm2);\
                    paddw_r2r(mm4,mm0);\
                    psllw_i2r(2,mm1);\
                    paddw_r2r(mm6,mm2);\
                    paddw_r2r(mm2,mm1);\
                    psubusw_r2r(mm0,mm1);\
                    psrlw_i2r(3,mm1);\
                    packuswb_r2r(mm7,mm1);\
                    movd_r2m(mm1,lum_m2[0]);

#define DEINT_LINE_LUM \
                    movd_m2r(lum_m4[0],mm0);\
                    movd_m2r(lum_m3[0],mm1);\
                    movd_m2r(lum_m2[0],mm2);\
                    movd_m2r(lum_m1[0],mm3);\
                    movd_m2r(lum[0],mm4);\
                    punpcklbw_r2r(mm7,mm0);\
                    punpcklbw_r2r(mm7,mm1);\
                    punpcklbw_r2r(mm7,mm2);\
                    punpcklbw_r2r(mm7,mm3);\
                    punpcklbw_r2r(mm7,mm4);\
                    paddw_r2r(mm3,mm1);\
                    psllw_i2r(1,mm2);\
                    paddw_r2r(mm4,mm0);\
                    psllw_i2r(2,mm1);\
                    paddw_r2r(mm6,mm2);\
                    paddw_r2r(mm2,mm1);\
                    psubusw_r2r(mm0,mm1);\
                    psrlw_i2r(3,mm1);\
                    packuswb_r2r(mm7,mm1);\
                    movd_r2m(mm1,dst[0]);
#endif

/* filter parameters: [-1 4 2 4 -1] // 8 */
static void deinterlace_line(uint8_t *dst, uint8_t *lum_m4, uint8_t *lum_m3, uint8_t *lum_m2, uint8_t *lum_m1, uint8_t *lum,
                                int size)
{
#ifndef HAVE_MMX
    uint8_t *cm = 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++;
    }
#else

    {
        mmx_t rounder;
        rounder.uw[0]=4;
        rounder.uw[1]=4;
        rounder.uw[2]=4;
        rounder.uw[3]=4;
        pxor_r2r(mm7,mm7);
        movq_m2r(rounder,mm6);
    }
    for (;size > 3; size-=4) {
        DEINT_LINE_LUM
        lum_m4+=4;
        lum_m3+=4;
        lum_m2+=4;
        lum_m1+=4;
        lum+=4;
        dst+=4;
    }
#endif
}
static void deinterlace_line_inplace(uint8_t *lum_m4, uint8_t *lum_m3, uint8_t *lum_m2, uint8_t *lum_m1, uint8_t *lum,
                             int size)
{
#ifndef HAVE_MMX
    uint8_t *cm = 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++;
    }
#else

    {
        mmx_t rounder;
        rounder.uw[0]=4;
        rounder.uw[1]=4;
        rounder.uw[2]=4;
        rounder.uw[3]=4;
        pxor_r2r(mm7,mm7);
        movq_m2r(rounder,mm6);
    }
    for (;size > 3; size-=4) {
        DEINT_INPLACE_LINE_LUM
        lum_m4+=4;
        lum_m3+=4;
        lum_m2+=4;
        lum_m1+=4;
        lum+=4;
    }
#endif
}

/* 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,
                                    uint8_t *src1, int src_wrap,
                                    int width, int height)
{
    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 = (uint8_t*)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);
}


/* deinterlace - if not supported return -1 */
int avpicture_deinterlace(AVPicture *dst, AVPicture *src,
                          int pix_fmt, int width, int height)
{
    int i;

    if (pix_fmt != PIX_FMT_YUV420P &&
        pix_fmt != PIX_FMT_YUV422P &&
        pix_fmt != PIX_FMT_YUV444P)
        return -1;
    if ((width & 3) != 0 || (height & 3) != 0)
        return -1;

    for(i=0;i<3;i++) {
        if (i == 1) {
            switch(pix_fmt) {
            case PIX_FMT_YUV420P:
                width >>= 1;
                height >>= 1;
                break;
            case PIX_FMT_YUV422P:
                width >>= 1;
                break;
            default:
                break;
            }
        }
        if (src == dst) {
            deinterlace_bottom_field_inplace(src->data[i], src->linesize[i],
                                 width, height);
        } else {
            deinterlace_bottom_field(dst->data[i],dst->linesize[i],
                                        src->data[i], src->linesize[i],
                                        width, height);
        }
    }
#ifdef HAVE_MMX
    emms();
#endif
    return 0;
}

#undef FIX