libswscale/rgb2rgb_template.c

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/*
 * software RGB to RGB converter
 * pluralize by software PAL8 to RGB converter
 *              software YUV to YUV converter
 *              software YUV to RGB converter
 * Written by Nick Kurshev.
 * palette & YUV & runtime CPU stuff by Michael (michaelni@gmx.at)
 * lot of big-endian byte order fixes by Alex Beregszaszi
 *
 * 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
 */

#include <stddef.h>

static inline void rgb24tobgr32_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    uint8_t *dest = dst;
    const uint8_t *s = src;
    const uint8_t *end;
    end = s + src_size;

    while (s < end) {
#if HAVE_BIGENDIAN
        /* RGB24 (= R,G,B) -> RGB32 (= A,B,G,R) */
        *dest++ = 255;
        *dest++ = s[2];
        *dest++ = s[1];
        *dest++ = s[0];
        s+=3;
#else
        *dest++ = *s++;
        *dest++ = *s++;
        *dest++ = *s++;
        *dest++ = 255;
#endif
    }
}

static inline void rgb32tobgr24_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    uint8_t *dest = dst;
    const uint8_t *s = src;
    const uint8_t *end;

    end = s + src_size;

    while (s < end) {
#if HAVE_BIGENDIAN
        /* RGB32 (= A,B,G,R) -> RGB24 (= R,G,B) */
        s++;
        dest[2] = *s++;
        dest[1] = *s++;
        dest[0] = *s++;
        dest += 3;
#else
        *dest++ = *s++;
        *dest++ = *s++;
        *dest++ = *s++;
        s++;
#endif
    }
}

/*
 original by Strepto/Astral
 ported to gcc & bugfixed: A'rpi
 MMX2, 3DNOW optimization by Nick Kurshev
 32-bit C version, and and&add trick by Michael Niedermayer
*/
static inline void rgb15to16_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    register const uint8_t* s=src;
    register uint8_t* d=dst;
    register const uint8_t *end;
    const uint8_t *mm_end;
    end = s + src_size;
    mm_end = end - 3;
    while (s < mm_end) {
        register unsigned x= *((const uint32_t *)s);
        *((uint32_t *)d) = (x&0x7FFF7FFF) + (x&0x7FE07FE0);
        d+=4;
        s+=4;
    }
    if (s < end) {
        register unsigned short x= *((const uint16_t *)s);
        *((uint16_t *)d) = (x&0x7FFF) + (x&0x7FE0);
    }
}

static inline void rgb16to15_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    register const uint8_t* s=src;
    register uint8_t* d=dst;
    register const uint8_t *end;
    const uint8_t *mm_end;
    end = s + src_size;

    mm_end = end - 3;
    while (s < mm_end) {
        register uint32_t x= *((const uint32_t*)s);
        *((uint32_t *)d) = ((x>>1)&0x7FE07FE0) | (x&0x001F001F);
        s+=4;
        d+=4;
    }
    if (s < end) {
        register uint16_t x= *((const uint16_t*)s);
        *((uint16_t *)d) = ((x>>1)&0x7FE0) | (x&0x001F);
    }
}

static inline void rgb32to16_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    const uint8_t *s = src;
    const uint8_t *end;
    uint16_t *d = (uint16_t *)dst;
    end = s + src_size;

    while (s < end) {
        register int rgb = *(const uint32_t*)s; s += 4;
        *d++ = ((rgb&0xFF)>>3) + ((rgb&0xFC00)>>5) + ((rgb&0xF80000)>>8);
    }
}

static inline void rgb32tobgr16_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    const uint8_t *s = src;
    const uint8_t *end;
    uint16_t *d = (uint16_t *)dst;
    end = s + src_size;
    while (s < end) {
        register int rgb = *(const uint32_t*)s; s += 4;
        *d++ = ((rgb&0xF8)<<8) + ((rgb&0xFC00)>>5) + ((rgb&0xF80000)>>19);
    }
}

static inline void rgb32to15_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    const uint8_t *s = src;
    const uint8_t *end;
    uint16_t *d = (uint16_t *)dst;
    end = s + src_size;
    while (s < end) {
        register int rgb = *(const uint32_t*)s; s += 4;
        *d++ = ((rgb&0xFF)>>3) + ((rgb&0xF800)>>6) + ((rgb&0xF80000)>>9);
    }
}

static inline void rgb32tobgr15_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    const uint8_t *s = src;
    const uint8_t *end;
    uint16_t *d = (uint16_t *)dst;
    end = s + src_size;
    while (s < end) {
        register int rgb = *(const uint32_t*)s; s += 4;
        *d++ = ((rgb&0xF8)<<7) + ((rgb&0xF800)>>6) + ((rgb&0xF80000)>>19);
    }
}

static inline void rgb24tobgr16_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    const uint8_t *s = src;
    const uint8_t *end;
    uint16_t *d = (uint16_t *)dst;
    end = s + src_size;
    while (s < end) {
        const int b = *s++;
        const int g = *s++;
        const int r = *s++;
        *d++ = (b>>3) | ((g&0xFC)<<3) | ((r&0xF8)<<8);
    }
}

static inline void rgb24to16_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    const uint8_t *s = src;
    const uint8_t *end;
    uint16_t *d = (uint16_t *)dst;
    end = s + src_size;
    while (s < end) {
        const int r = *s++;
        const int g = *s++;
        const int b = *s++;
        *d++ = (b>>3) | ((g&0xFC)<<3) | ((r&0xF8)<<8);
    }
}

static inline void rgb24tobgr15_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    const uint8_t *s = src;
    const uint8_t *end;
    uint16_t *d = (uint16_t *)dst;
    end = s + src_size;
    while (s < end) {
        const int b = *s++;
        const int g = *s++;
        const int r = *s++;
        *d++ = (b>>3) | ((g&0xF8)<<2) | ((r&0xF8)<<7);
    }
}

static inline void rgb24to15_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    const uint8_t *s = src;
    const uint8_t *end;
    uint16_t *d = (uint16_t *)dst;
    end = s + src_size;
    while (s < end) {
        const int r = *s++;
        const int g = *s++;
        const int b = *s++;
        *d++ = (b>>3) | ((g&0xF8)<<2) | ((r&0xF8)<<7);
    }
}

static inline void rgb15tobgr24_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    const uint16_t *end;
    uint8_t *d = dst;
    const uint16_t *s = (const uint16_t*)src;
    end = s + src_size/2;
    while (s < end) {
        register uint16_t bgr;
        bgr = *s++;
        *d++ = ((bgr&0x1F)<<3) | ((bgr&0x1F)>>2);
        *d++ = ((bgr&0x3E0)>>2) | ((bgr&0x3E0)>>7);
        *d++ = ((bgr&0x7C00)>>7) | ((bgr&0x7C00)>>12);
    }
}

static inline void rgb16tobgr24_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    const uint16_t *end;
    uint8_t *d = (uint8_t *)dst;
    const uint16_t *s = (const uint16_t *)src;
    end = s + src_size/2;
    while (s < end) {
        register uint16_t bgr;
        bgr = *s++;
        *d++ = ((bgr&0x1F)<<3) | ((bgr&0x1F)>>2);
        *d++ = ((bgr&0x7E0)>>3) | ((bgr&0x7E0)>>9);
        *d++ = ((bgr&0xF800)>>8) | ((bgr&0xF800)>>13);
    }
}

static inline void rgb15to32_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    const uint16_t *end;
    uint8_t *d = dst;
    const uint16_t *s = (const uint16_t *)src;
    end = s + src_size/2;
    while (s < end) {
        register uint16_t bgr;
        bgr = *s++;
#if HAVE_BIGENDIAN
        *d++ = 255;
        *d++ = ((bgr&0x7C00)>>7) | ((bgr&0x7C00)>>12);
        *d++ = ((bgr&0x3E0)>>2) | ((bgr&0x3E0)>>7);
        *d++ = ((bgr&0x1F)<<3) | ((bgr&0x1F)>>2);
#else
        *d++ = ((bgr&0x1F)<<3) | ((bgr&0x1F)>>2);
        *d++ = ((bgr&0x3E0)>>2) | ((bgr&0x3E0)>>7);
        *d++ = ((bgr&0x7C00)>>7) | ((bgr&0x7C00)>>12);
        *d++ = 255;
#endif
    }
}

static inline void rgb16to32_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    const uint16_t *end;
    uint8_t *d = dst;
    const uint16_t *s = (const uint16_t*)src;
    end = s + src_size/2;
    while (s < end) {
        register uint16_t bgr;
        bgr = *s++;
#if HAVE_BIGENDIAN
        *d++ = 255;
        *d++ = ((bgr&0xF800)>>8) | ((bgr&0xF800)>>13);
        *d++ = ((bgr&0x7E0)>>3) | ((bgr&0x7E0)>>9);
        *d++ = ((bgr&0x1F)<<3) | ((bgr&0x1F)>>2);
#else
        *d++ = ((bgr&0x1F)<<3) | ((bgr&0x1F)>>2);
        *d++ = ((bgr&0x7E0)>>3) | ((bgr&0x7E0)>>9);
        *d++ = ((bgr&0xF800)>>8) | ((bgr&0xF800)>>13);
        *d++ = 255;
#endif
    }
}

static inline void shuffle_bytes_2103_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    int idx = 15 - src_size;
    const uint8_t *s = src-idx;
    uint8_t *d = dst-idx;
    for (; idx<15; idx+=4) {
        register int v = *(const uint32_t *)&s[idx], g = v & 0xff00ff00;
        v &= 0xff00ff;
        *(uint32_t *)&d[idx] = (v>>16) + g + (v<<16);
    }
}

static inline void rgb24tobgr24_c(const uint8_t *src, uint8_t *dst, int src_size)
{
    unsigned i;
    for (i=0; i<src_size; i+=3) {
        register uint8_t x;
        x          = src[i + 2];
        dst[i + 1] = src[i + 1];
        dst[i + 2] = src[i + 0];
        dst[i + 0] = x;
    }
}

static inline void yuvPlanartoyuy2_c(const uint8_t *ysrc, const uint8_t *usrc,
                                     const uint8_t *vsrc, uint8_t *dst,
                                     int width, int height,
                                     int lumStride, int chromStride,
                                     int dstStride, int vertLumPerChroma)
{
    int y;
    const int chromWidth = width >> 1;
    for (y=0; y<height; y++) {
#if HAVE_FAST_64BIT
        int i;
        uint64_t *ldst = (uint64_t *) dst;
        const uint8_t *yc = ysrc, *uc = usrc, *vc = vsrc;
        for (i = 0; i < chromWidth; i += 2) {
            uint64_t k, l;
            k = yc[0] + (uc[0] << 8) +
                (yc[1] << 16) + (vc[0] << 24);
            l = yc[2] + (uc[1] << 8) +
                (yc[3] << 16) + (vc[1] << 24);
            *ldst++ = k + (l << 32);
            yc += 4;
            uc += 2;
            vc += 2;
        }

#else
        int i, *idst = (int32_t *) dst;
        const uint8_t *yc = ysrc, *uc = usrc, *vc = vsrc;
        for (i = 0; i < chromWidth; i++) {
#if HAVE_BIGENDIAN
            *idst++ = (yc[0] << 24)+ (uc[0] << 16) +
                (yc[1] << 8) + (vc[0] << 0);
#else
            *idst++ = yc[0] + (uc[0] << 8) +
                (yc[1] << 16) + (vc[0] << 24);
#endif
            yc += 2;
            uc++;
            vc++;
        }
#endif
        if ((y&(vertLumPerChroma-1)) == vertLumPerChroma-1) {
            usrc += chromStride;
            vsrc += chromStride;
        }
        ysrc += lumStride;
        dst  += dstStride;
    }
}

static inline void yv12toyuy2_c(const uint8_t *ysrc, const uint8_t *usrc,
                                const uint8_t *vsrc, uint8_t *dst,
                                int width, int height,
                                int lumStride, int chromStride,
                                int dstStride)
{
    //FIXME interpolate chroma
    yuvPlanartoyuy2_c(ysrc, usrc, vsrc, dst, width, height, lumStride,
                      chromStride, dstStride, 2);
}

static inline void yuvPlanartouyvy_c(const uint8_t *ysrc, const uint8_t *usrc,
                                     const uint8_t *vsrc, uint8_t *dst,
                                     int width, int height,
                                     int lumStride, int chromStride,
                                     int dstStride, int vertLumPerChroma)
{
    int y;
    const int chromWidth = width >> 1;
    for (y=0; y<height; y++) {
#if HAVE_FAST_64BIT
        int i;
        uint64_t *ldst = (uint64_t *) dst;
        const uint8_t *yc = ysrc, *uc = usrc, *vc = vsrc;
        for (i = 0; i < chromWidth; i += 2) {
            uint64_t k, l;
            k = uc[0] + (yc[0] << 8) +
                (vc[0] << 16) + (yc[1] << 24);
            l = uc[1] + (yc[2] << 8) +
                (vc[1] << 16) + (yc[3] << 24);
            *ldst++ = k + (l << 32);
            yc += 4;
            uc += 2;
            vc += 2;
        }

#else
        int i, *idst = (int32_t *) dst;
        const uint8_t *yc = ysrc, *uc = usrc, *vc = vsrc;
        for (i = 0; i < chromWidth; i++) {
#if HAVE_BIGENDIAN
            *idst++ = (uc[0] << 24)+ (yc[0] << 16) +
                (vc[0] << 8) + (yc[1] << 0);
#else
            *idst++ = uc[0] + (yc[0] << 8) +
               (vc[0] << 16) + (yc[1] << 24);
#endif
            yc += 2;
            uc++;
            vc++;
        }
#endif
        if ((y&(vertLumPerChroma-1)) == vertLumPerChroma-1) {
            usrc += chromStride;
            vsrc += chromStride;
        }
        ysrc += lumStride;
        dst += dstStride;
    }
}

static inline void yv12touyvy_c(const uint8_t *ysrc, const uint8_t *usrc,
                                const uint8_t *vsrc, uint8_t *dst,
                                int width, int height,
                                int lumStride, int chromStride,
                                int dstStride)
{
    //FIXME interpolate chroma
    yuvPlanartouyvy_c(ysrc, usrc, vsrc, dst, width, height, lumStride,
                      chromStride, dstStride, 2);
}

static inline void yuv422ptouyvy_c(const uint8_t *ysrc, const uint8_t *usrc,
                                   const uint8_t *vsrc, uint8_t *dst,
                                   int width, int height,
                                   int lumStride, int chromStride,
                                   int dstStride)
{
    yuvPlanartouyvy_c(ysrc, usrc, vsrc, dst, width, height, lumStride,
                      chromStride, dstStride, 1);
}

static inline void yuv422ptoyuy2_c(const uint8_t *ysrc, const uint8_t *usrc,
                                   const uint8_t *vsrc, uint8_t *dst,
                                   int width, int height,
                                   int lumStride, int chromStride,
                                   int dstStride)
{
    yuvPlanartoyuy2_c(ysrc, usrc, vsrc, dst, width, height, lumStride,
                      chromStride, dstStride, 1);
}

static inline void yuy2toyv12_c(const uint8_t *src, uint8_t *ydst,
                                uint8_t *udst, uint8_t *vdst,
                                int width, int height,
                                int lumStride, int chromStride,
                                int srcStride)
{
    int y;
    const int chromWidth = width >> 1;
    for (y=0; y<height; y+=2) {
        int i;
        for (i=0; i<chromWidth; i++) {
            ydst[2*i+0]     = src[4*i+0];
            udst[i]     = src[4*i+1];
            ydst[2*i+1]     = src[4*i+2];
            vdst[i]     = src[4*i+3];
        }
        ydst += lumStride;
        src  += srcStride;

        for (i=0; i<chromWidth; i++) {
            ydst[2*i+0]     = src[4*i+0];
            ydst[2*i+1]     = src[4*i+2];
        }
        udst += chromStride;
        vdst += chromStride;
        ydst += lumStride;
        src  += srcStride;
    }
}

static inline void planar2x_c(const uint8_t *src, uint8_t *dst, int srcWidth,
                              int srcHeight, int srcStride, int dstStride)
{
    int x,y;

    dst[0]= src[0];

    // first line
    for (x=0; x<srcWidth-1; x++) {
        dst[2*x+1]= (3*src[x] +   src[x+1])>>2;
        dst[2*x+2]= (  src[x] + 3*src[x+1])>>2;
    }
    dst[2*srcWidth-1]= src[srcWidth-1];

    dst+= dstStride;

    for (y=1; y<srcHeight; y++) {
        const int mmxSize = 1;

        dst[0        ]= (3*src[0] +   src[srcStride])>>2;
        dst[dstStride]= (  src[0] + 3*src[srcStride])>>2;

        for (x=mmxSize-1; x<srcWidth-1; x++) {
            dst[2*x          +1]= (3*src[x+0] +   src[x+srcStride+1])>>2;
            dst[2*x+dstStride+2]= (  src[x+0] + 3*src[x+srcStride+1])>>2;
            dst[2*x+dstStride+1]= (  src[x+1] + 3*src[x+srcStride  ])>>2;
            dst[2*x          +2]= (3*src[x+1] +   src[x+srcStride  ])>>2;
        }
        dst[srcWidth*2 -1            ]= (3*src[srcWidth-1] +   src[srcWidth-1 + srcStride])>>2;
        dst[srcWidth*2 -1 + dstStride]= (  src[srcWidth-1] + 3*src[srcWidth-1 + srcStride])>>2;

        dst+=dstStride*2;
        src+=srcStride;
    }

    // last line
    dst[0]= src[0];

    for (x=0; x<srcWidth-1; x++) {
        dst[2*x+1]= (3*src[x] +   src[x+1])>>2;
        dst[2*x+2]= (  src[x] + 3*src[x+1])>>2;
    }
    dst[2*srcWidth-1]= src[srcWidth-1];
}

static inline void uyvytoyv12_c(const uint8_t *src, uint8_t *ydst,
                                uint8_t *udst, uint8_t *vdst,
                                int width, int height,
                                int lumStride, int chromStride,
                                int srcStride)
{
    int y;
    const int chromWidth = width >> 1;
    for (y=0; y<height; y+=2) {
        int i;
        for (i=0; i<chromWidth; i++) {
            udst[i]     = src[4*i+0];
            ydst[2*i+0] = src[4*i+1];
            vdst[i]     = src[4*i+2];
            ydst[2*i+1] = src[4*i+3];
        }
        ydst += lumStride;
        src  += srcStride;

        for (i=0; i<chromWidth; i++) {
            ydst[2*i+0] = src[4*i+1];
            ydst[2*i+1] = src[4*i+3];
        }
        udst += chromStride;
        vdst += chromStride;
        ydst += lumStride;
        src  += srcStride;
    }
}

void rgb24toyv12_c(const uint8_t *src, uint8_t *ydst, uint8_t *udst,
                   uint8_t *vdst, int width, int height, int lumStride,
                   int chromStride, int srcStride)
{
    int y;
    const int chromWidth = width >> 1;
    y=0;
    for (; y<height; y+=2) {
        int i;
        for (i=0; i<chromWidth; i++) {
            unsigned int b = src[6*i+0];
            unsigned int g = src[6*i+1];
            unsigned int r = src[6*i+2];

            unsigned int Y  =  ((RY*r + GY*g + BY*b)>>RGB2YUV_SHIFT) + 16;
            unsigned int V  =  ((RV*r + GV*g + BV*b)>>RGB2YUV_SHIFT) + 128;
            unsigned int U  =  ((RU*r + GU*g + BU*b)>>RGB2YUV_SHIFT) + 128;

            udst[i]     = U;
            vdst[i]     = V;
            ydst[2*i]   = Y;

            b = src[6*i+3];
            g = src[6*i+4];
            r = src[6*i+5];

            Y  =  ((RY*r + GY*g + BY*b)>>RGB2YUV_SHIFT) + 16;
            ydst[2*i+1]     = Y;
        }
        ydst += lumStride;
        src  += srcStride;

        if(y+1 == height)
            break;

        for (i=0; i<chromWidth; i++) {
            unsigned int b = src[6*i+0];
            unsigned int g = src[6*i+1];
            unsigned int r = src[6*i+2];

            unsigned int Y  =  ((RY*r + GY*g + BY*b)>>RGB2YUV_SHIFT) + 16;

            ydst[2*i]     = Y;

            b = src[6*i+3];
            g = src[6*i+4];
            r = src[6*i+5];

            Y  =  ((RY*r + GY*g + BY*b)>>RGB2YUV_SHIFT) + 16;
            ydst[2*i+1]     = Y;
        }
        udst += chromStride;
        vdst += chromStride;
        ydst += lumStride;
        src  += srcStride;
    }
}

static void interleaveBytes_c(const uint8_t *src1, const uint8_t *src2,
                              uint8_t *dest, int width,
                              int height, int src1Stride,
                              int src2Stride, int dstStride)
{
    int h;

    for (h=0; h < height; h++) {
        int w;
        for (w=0; w < width; w++) {
            dest[2*w+0] = src1[w];
            dest[2*w+1] = src2[w];
        }
        dest += dstStride;
        src1 += src1Stride;
        src2 += src2Stride;
    }
}

static inline void vu9_to_vu12_c(const uint8_t *src1, const uint8_t *src2,
                                 uint8_t *dst1, uint8_t *dst2,
                                 int width, int height,
                                 int srcStride1, int srcStride2,
                                 int dstStride1, int dstStride2)
{
    int y;
    int x,w,h;
    w=width/2; h=height/2;
    for (y=0;y<h;y++) {
        const uint8_t* s1=src1+srcStride1*(y>>1);
        uint8_t* d=dst1+dstStride1*y;
        x=0;
        for (;x<w;x++) d[2*x]=d[2*x+1]=s1[x];
    }
    for (y=0;y<h;y++) {
        const uint8_t* s2=src2+srcStride2*(y>>1);
        uint8_t* d=dst2+dstStride2*y;
        x=0;
        for (;x<w;x++) d[2*x]=d[2*x+1]=s2[x];
    }
}

static inline void yvu9_to_yuy2_c(const uint8_t *src1, const uint8_t *src2,
                                  const uint8_t *src3, uint8_t *dst,
                                  int width, int height,
                                  int srcStride1, int srcStride2,
                                  int srcStride3, int dstStride)
{
    int x;
    int y,w,h;
    w=width/2; h=height;
    for (y=0;y<h;y++) {
        const uint8_t* yp=src1+srcStride1*y;
        const uint8_t* up=src2+srcStride2*(y>>2);
        const uint8_t* vp=src3+srcStride3*(y>>2);
        uint8_t* d=dst+dstStride*y;
        x=0;
        for (; x<w; x++) {
            const int x2 = x<<2;
            d[8*x+0] = yp[x2];
            d[8*x+1] = up[x];
            d[8*x+2] = yp[x2+1];
            d[8*x+3] = vp[x];
            d[8*x+4] = yp[x2+2];
            d[8*x+5] = up[x];
            d[8*x+6] = yp[x2+3];
            d[8*x+7] = vp[x];
        }
    }
}

static void extract_even_c(const uint8_t *src, uint8_t *dst, int count)
{
    dst +=   count;
    src += 2*count;
    count= - count;

    while(count<0) {
        dst[count]= src[2*count];
        count++;
    }
}

static void extract_even2_c(const uint8_t *src, uint8_t *dst0, uint8_t *dst1,
                            int count)
{
    dst0+=   count;
    dst1+=   count;
    src += 4*count;
    count= - count;
    while(count<0) {
        dst0[count]= src[4*count+0];
        dst1[count]= src[4*count+2];
        count++;
    }
}

static void extract_even2avg_c(const uint8_t *src0, const uint8_t *src1,
                               uint8_t *dst0, uint8_t *dst1, int count)
{
    dst0 +=   count;
    dst1 +=   count;
    src0 += 4*count;
    src1 += 4*count;
    count= - count;
    while(count<0) {
        dst0[count]= (src0[4*count+0]+src1[4*count+0])>>1;
        dst1[count]= (src0[4*count+2]+src1[4*count+2])>>1;
        count++;
    }
}

static void extract_odd2_c(const uint8_t *src, uint8_t *dst0, uint8_t *dst1,
                           int count)
{
    dst0+=   count;
    dst1+=   count;
    src += 4*count;
    count= - count;
    src++;
    while(count<0) {
        dst0[count]= src[4*count+0];
        dst1[count]= src[4*count+2];
        count++;
    }
}

static void extract_odd2avg_c(const uint8_t *src0, const uint8_t *src1,
                              uint8_t *dst0, uint8_t *dst1, int count)
{
    dst0 +=   count;
    dst1 +=   count;
    src0 += 4*count;
    src1 += 4*count;
    count= - count;
    src0++;
    src1++;
    while(count<0) {
        dst0[count]= (src0[4*count+0]+src1[4*count+0])>>1;
        dst1[count]= (src0[4*count+2]+src1[4*count+2])>>1;
        count++;
    }
}

static void yuyvtoyuv420_c(uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
                           const uint8_t *src, int width, int height,
                           int lumStride, int chromStride, int srcStride)
{
    int y;
    const int chromWidth= -((-width)>>1);

    for (y=0; y<height; y++) {
        extract_even_c(src, ydst, width);
        if(y&1) {
            extract_odd2avg_c(src - srcStride, src, udst, vdst, chromWidth);
            udst+= chromStride;
            vdst+= chromStride;
        }

        src += srcStride;
        ydst+= lumStride;
    }
}

static void yuyvtoyuv422_c(uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
                           const uint8_t *src, int width, int height,
                           int lumStride, int chromStride, int srcStride)
{
    int y;
    const int chromWidth= -((-width)>>1);

    for (y=0; y<height; y++) {
        extract_even_c(src, ydst, width);
        extract_odd2_c(src, udst, vdst, chromWidth);

        src += srcStride;
        ydst+= lumStride;
        udst+= chromStride;
        vdst+= chromStride;
    }
}

static void uyvytoyuv420_c(uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
                           const uint8_t *src, int width, int height,
                           int lumStride, int chromStride, int srcStride)
{
    int y;
    const int chromWidth= -((-width)>>1);

    for (y=0; y<height; y++) {
        extract_even_c(src + 1, ydst, width);
        if(y&1) {
            extract_even2avg_c(src - srcStride, src, udst, vdst, chromWidth);
            udst+= chromStride;
            vdst+= chromStride;
        }

        src += srcStride;
        ydst+= lumStride;
    }
}

static void uyvytoyuv422_c(uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
                           const uint8_t *src, int width, int height,
                           int lumStride, int chromStride, int srcStride)
{
    int y;
    const int chromWidth= -((-width)>>1);

    for (y=0; y<height; y++) {
        extract_even_c(src + 1, ydst, width);
        extract_even2_c(src, udst, vdst, chromWidth);

        src += srcStride;
        ydst+= lumStride;
        udst+= chromStride;
        vdst+= chromStride;
    }
}

static inline void rgb2rgb_init_c(void)
{
    rgb15to16          = rgb15to16_c;
    rgb15tobgr24       = rgb15tobgr24_c;
    rgb15to32          = rgb15to32_c;
    rgb16tobgr24       = rgb16tobgr24_c;
    rgb16to32          = rgb16to32_c;
    rgb16to15          = rgb16to15_c;
    rgb24tobgr16       = rgb24tobgr16_c;
    rgb24tobgr15       = rgb24tobgr15_c;
    rgb24tobgr32       = rgb24tobgr32_c;
    rgb32to16          = rgb32to16_c;
    rgb32to15          = rgb32to15_c;
    rgb32tobgr24       = rgb32tobgr24_c;
    rgb24to15          = rgb24to15_c;
    rgb24to16          = rgb24to16_c;
    rgb24tobgr24       = rgb24tobgr24_c;
    shuffle_bytes_2103 = shuffle_bytes_2103_c;
    rgb32tobgr16       = rgb32tobgr16_c;
    rgb32tobgr15       = rgb32tobgr15_c;
    yv12toyuy2         = yv12toyuy2_c;
    yv12touyvy         = yv12touyvy_c;
    yuv422ptoyuy2      = yuv422ptoyuy2_c;
    yuv422ptouyvy      = yuv422ptouyvy_c;
    yuy2toyv12         = yuy2toyv12_c;
    planar2x           = planar2x_c;
    rgb24toyv12        = rgb24toyv12_c;
    interleaveBytes    = interleaveBytes_c;
    vu9_to_vu12        = vu9_to_vu12_c;
    yvu9_to_yuy2       = yvu9_to_yuy2_c;

    uyvytoyuv420       = uyvytoyuv420_c;
    uyvytoyuv422       = uyvytoyuv422_c;
    yuyvtoyuv420       = yuyvtoyuv420_c;
    yuyvtoyuv422       = yuyvtoyuv422_c;
}

---