i420_rgb.h

video linux conference

/*****************************************************************************
 * i420_rgb.h : YUV to bitmap RGB conversion module for vlc
 *****************************************************************************
 * Copyright (C) 2000, 2004 VideoLAN
 * $Id: i420_rgb.h 10101 2005-03-02 16:47:31Z robux4 $
 *
 * Authors: Samuel Hocevar <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/** Number of entries in RGB palette/colormap */
#define CMAP_RGB2_SIZE 256

/**
 * chroma_sys_t: chroma method descriptor

 * This structure is part of the chroma transformation descriptor, it
 * describes the yuv2rgb specific properties.
 */
struct chroma_sys_t
{
    uint8_t  *p_buffer;
    int *p_offset;

#ifdef MODULE_NAME_IS_i420_rgb
    /**< Pre-calculated conversion tables */
    void *p_base;                      /**< base for all conversion tables */
    uint8_t   *p_rgb8;                 /**< RGB 8 bits table */
    uint16_t  *p_rgb16;                /**< RGB 16 bits table */
    uint32_t  *p_rgb32;                /**< RGB 32 bits table */

    /**< To get RGB value for palette entry i, use (p_rgb_r[i], p_rgb_g[i],
       p_rgb_b[i]). Note these are 16 bits per pixel. For 8bpp entries,
       shift right 8 bits.
    */
    uint16_t  p_rgb_r[CMAP_RGB2_SIZE];  /**< Red values of palette */
    uint16_t  p_rgb_g[CMAP_RGB2_SIZE];  /**< Green values of palette */
    uint16_t  p_rgb_b[CMAP_RGB2_SIZE];  /**< Blue values of palette */
#endif
};

/*****************************************************************************
 * Prototypes
 *****************************************************************************/
#ifdef MODULE_NAME_IS_i420_rgb
void E_(I420_RGB8)         ( vout_thread_t *, picture_t *, picture_t * );
void E_(I420_RGB16_dither) ( vout_thread_t *, picture_t *, picture_t * );
#endif
void E_(I420_RGB16)        ( vout_thread_t *, picture_t *, picture_t * );
void E_(I420_RGB32)        ( vout_thread_t *, picture_t *, picture_t * );

/*****************************************************************************
 * CONVERT_*_PIXEL: pixel conversion macros
 *****************************************************************************
 * These conversion routines are used by YUV conversion functions.
 * conversion are made from p_y, p_u, p_v, which are modified, to p_buffer,
 * which is also modified. CONVERT_4YUV_PIXEL is used for 8bpp dithering,
 * CONVERT_4YUV_PIXEL_SCALE does the same but also scales the output.
 *****************************************************************************/
#define CONVERT_Y_PIXEL( BPP )                                                \
    /* Only Y sample is present */                                            \
    p_ybase = p_yuv + *p_y++;                                                 \
    *p_buffer++ = p_ybase[RED_OFFSET-((V_RED_COEF*128)>>SHIFT) + i_red] |     \
        p_ybase[GREEN_OFFSET-(((U_GREEN_COEF+V_GREEN_COEF)*128)>>SHIFT)       \
        + i_green ] | p_ybase[BLUE_OFFSET-((U_BLUE_COEF*128)>>SHIFT) + i_blue];

#define CONVERT_YUV_PIXEL( BPP )                                              \
    /* Y, U and V samples are present */                                      \
    i_uval =    *p_u++;                                                       \
    i_vval =    *p_v++;                                                       \
    i_red =     (V_RED_COEF * i_vval) >> SHIFT;                               \
    i_green =   (U_GREEN_COEF * i_uval + V_GREEN_COEF * i_vval) >> SHIFT;     \
    i_blue =    (U_BLUE_COEF * i_uval) >> SHIFT;                              \
    CONVERT_Y_PIXEL( BPP )                                                    \

#define CONVERT_Y_PIXEL_DITHER( BPP )                                         \
    /* Only Y sample is present */                                            \
    p_ybase = p_yuv + *p_y++;                                                 \
    *p_buffer++ = p_ybase[RED_OFFSET-((V_RED_COEF*128+p_dither[i_real_y])>>SHIFT) + i_red] |     \
        p_ybase[GREEN_OFFSET-(((U_GREEN_COEF+V_GREEN_COEF)*128+p_dither[i_real_y])>>SHIFT)       \
        + i_green ] | p_ybase[BLUE_OFFSET-((U_BLUE_COEF*128+p_dither[i_real_y])>>SHIFT) + i_blue];

#define CONVERT_YUV_PIXEL_DITHER( BPP )                                       \
    /* Y, U and V samples are present */                                      \
    i_uval =    *p_u++;                                                       \
    i_vval =    *p_v++;                                                       \
    i_red =     (V_RED_COEF * i_vval) >> SHIFT;                               \
    i_green =   (U_GREEN_COEF * i_uval + V_GREEN_COEF * i_vval) >> SHIFT;     \
    i_blue =    (U_BLUE_COEF * i_uval) >> SHIFT;                              \
    CONVERT_Y_PIXEL_DITHER( BPP )                                             \

#define CONVERT_4YUV_PIXEL( CHROMA )                                          \
    *p_pic++ = p_lookup[                                                      \
        (((*p_y++ + dither10[i_real_y]) >> 4) << 7)                           \
      + ((*p_u + dither20[i_real_y]) >> 5) * 9                                \
      + ((*p_v + dither20[i_real_y]) >> 5) ];                                 \
    *p_pic++ = p_lookup[                                                      \
        (((*p_y++ + dither11[i_real_y]) >> 4) << 7)                           \
      + ((*p_u++ + dither21[i_real_y]) >> 5) * 9                              \
      + ((*p_v++ + dither21[i_real_y]) >> 5) ];                               \
    *p_pic++ = p_lookup[                                                      \
        (((*p_y++ + dither12[i_real_y]) >> 4) << 7)                           \
      + ((*p_u + dither22[i_real_y]) >> 5) * 9                                \
      + ((*p_v + dither22[i_real_y]) >> 5) ];                                 \
    *p_pic++ = p_lookup[                                                      \
        (((*p_y++ + dither13[i_real_y]) >> 4) << 7)                           \
      + ((*p_u++ + dither23[i_real_y]) >> 5) * 9                              \
      + ((*p_v++ + dither23[i_real_y]) >> 5) ];                               \

#define CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                    \
    *p_pic++ = p_lookup[                                                      \
        ( ((*p_y + dither10[i_real_y]) >> 4) << 7)                            \
        + ((*p_u + dither20[i_real_y]) >> 5) * 9                              \
        + ((*p_v + dither20[i_real_y]) >> 5) ];                               \
    p_y += *p_offset++;                                                       \
    p_u += *p_offset;                                                         \
    p_v += *p_offset++;                                                       \
    *p_pic++ = p_lookup[                                                      \
        ( ((*p_y + dither11[i_real_y]) >> 4) << 7)                            \
        + ((*p_u + dither21[i_real_y]) >> 5) * 9                              \
        + ((*p_v + dither21[i_real_y]) >> 5) ];                               \
    p_y += *p_offset++;                                                       \
    p_u += *p_offset;                                                         \
    p_v += *p_offset++;                                                       \
    *p_pic++ = p_lookup[                                                      \
        ( ((*p_y + dither12[i_real_y]) >> 4) << 7)                            \
        + ((*p_u + dither22[i_real_y]) >> 5) * 9                              \
        + ((*p_v + dither22[i_real_y]) >> 5) ];                               \
    p_y += *p_offset++;                                                       \
    p_u += *p_offset;                                                         \
    p_v += *p_offset++;                                                       \
    *p_pic++ = p_lookup[                                                      \
        ( ((*p_y + dither13[i_real_y]) >> 4) << 7)                            \
        + ((*p_u + dither23[i_real_y]) >> 5) * 9                              \
        + ((*p_v + dither23[i_real_y]) >> 5) ];                               \
    p_y += *p_offset++;                                                       \
    p_u += *p_offset;                                                         \
    p_v += *p_offset++;                                                       \

/*****************************************************************************
 * SCALE_WIDTH: scale a line horizontally
 *****************************************************************************
 * This macro scales a line using rendering buffer and offset array. It works
 * for 1, 2 and 4 Bpp.
 *****************************************************************************/
#define SCALE_WIDTH                                                           \
    if( b_hscale )                                                            \
    {                                                                         \
        /* Horizontal scaling, conversion has been done to buffer.            \
         * Rewind buffer and offset, then copy and scale line */              \
        p_buffer = p_buffer_start;                                            \
        p_offset = p_offset_start;                                            \
        for( i_x = p_vout->output.i_width / 16; i_x--; )                      \
        {                                                                     \
            *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
            *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
            *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
            *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
            *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \