adjust.c

uclinux 下的vlc播放器源代码

/*****************************************************************************
 * Render: displays previously rendered output
 *****************************************************************************
 * This function send the currently rendered image to adjust modified image,
 * waits until it is displayed and switch the two rendering buffers, preparing
 * next frame.
 *****************************************************************************/
static void Render( vout_thread_t *p_vout, picture_t *p_pic )
{
    int pi_luma[256];
    int pi_gamma[256];

    picture_t *p_outpic;
    uint8_t *p_in, *p_in_v, *p_in_end, *p_line_end;
    uint8_t *p_out, *p_out_v;

    vlc_bool_t b_thres;
    double  f_hue;
    double  f_gamma;
    int32_t i_cont, i_lum;
    int i_sat, i_sin, i_cos, i_x, i_y;
    int i;
    vlc_value_t val;

    /* This is a new frame. Get a structure from the video_output. */
    while( ( p_outpic = vout_CreatePicture( p_vout->p_sys->p_vout, 0, 0, 0 ) )
              == NULL )
    {
        if( p_vout->b_die || p_vout->b_error )
        {
            return;
        }
        msleep( VOUT_OUTMEM_SLEEP );
    }

    vout_DatePicture( p_vout->p_sys->p_vout, p_outpic, p_pic->date );
    vout_LinkPicture( p_vout->p_sys->p_vout, p_outpic );

    /* Getvariables */
    var_Get( p_vout, "contrast", &val );
    i_cont = (int) ( val.f_float * 255 );
    var_Get( p_vout, "brightness", &val );
    i_lum = (int) (( val.f_float - 1.0 ) * 255 );
    var_Get( p_vout, "hue", &val );
    f_hue = (float) ( val.i_int * M_PI / 180 );
    var_Get( p_vout, "saturation", &val );
    i_sat = (int) (val.f_float * 256 );
    var_Get( p_vout, "gamma", &val );
    f_gamma = 1.0 / val.f_float;
    var_Get( p_vout, "brightness-threshold", &val );
    b_thres = (vlc_bool_t) ( val.b_bool );

    /*
     * Threshold mode drops out everything about luma, contrast and gamma.
     */
    if( b_thres != VLC_TRUE )
    {

        /* Contrast is a fast but kludged function, so I put this gap to be
         * cleaner :) */
        i_lum += 128 - i_cont / 2;

        /* Fill the gamma lookup table */
        for( i = 0 ; i < 256 ; i++ )
        {
          pi_gamma[ i ] = clip( pow(i / 255.0, f_gamma) * 255.0);
        }

        /* Fill the luma lookup table */
        for( i = 0 ; i < 256 ; i++ )
        {
            pi_luma[ i ] = pi_gamma[clip( i_lum + i_cont * i / 256)];
        }
    }
    else
    {
        /*
         * We get luma as threshold value: the higher it is, the darker is
         * the image. Should I reverse this?
         */
        for( i = 0 ; i < 256 ; i++ )
        {
            pi_luma[ i ] = (i < i_lum) ? 0 : 255;
        }

        /*
         * Desaturates image to avoid that strange yellow halo...
         */
        i_sat = 0;
    }

    /*
     * Do the Y plane
     */

    p_in = p_pic->p[0].p_pixels;
    p_in_end = p_in + p_pic->p[0].i_visible_lines * p_pic->p[0].i_pitch - 8;

    p_out = p_outpic->p[0].p_pixels;

    for( ; p_in < p_in_end ; )
    {
        p_line_end = p_in + p_pic->p[0].i_visible_pitch - 8;

        for( ; p_in < p_line_end ; )
        {
            /* Do 8 pixels at a time */
            *p_out++ = pi_luma[ *p_in++ ]; *p_out++ = pi_luma[ *p_in++ ];
            *p_out++ = pi_luma[ *p_in++ ]; *p_out++ = pi_luma[ *p_in++ ];
            *p_out++ = pi_luma[ *p_in++ ]; *p_out++ = pi_luma[ *p_in++ ];
            *p_out++ = pi_luma[ *p_in++ ]; *p_out++ = pi_luma[ *p_in++ ];
        }

        p_line_end += 8;

        for( ; p_in < p_line_end ; )
        {
            *p_out++ = pi_luma[ *p_in++ ];
        }

        p_in += p_pic->p[0].i_pitch - p_pic->p[0].i_visible_pitch;
        p_out += p_outpic->p[0].i_pitch - p_outpic->p[0].i_visible_pitch;
    }

    /*
     * Do the U and V planes
     */

    p_in = p_pic->p[1].p_pixels;
    p_in_v = p_pic->p[2].p_pixels;
    p_in_end = p_in + p_pic->p[1].i_visible_lines * p_pic->p[1].i_pitch - 8;

    p_out = p_outpic->p[1].p_pixels;
    p_out_v = p_outpic->p[2].p_pixels;

    i_sin = sin(f_hue) * 256;
    i_cos = cos(f_hue) * 256;

    i_x = ( cos(f_hue) + sin(f_hue) ) * 32768;
    i_y = ( cos(f_hue) - sin(f_hue) ) * 32768;

    if ( i_sat > 256 )
    {
#define WRITE_UV_CLIP() \
    i_u = *p_in++ ; i_v = *p_in_v++ ; \
    *p_out++ = clip( (( ((i_u * i_cos + i_v * i_sin - i_x) >> 8) \
                           * i_sat) >> 8) + 128); \
    *p_out_v++ = clip( (( ((i_v * i_cos - i_u * i_sin - i_y) >> 8) \
                           * i_sat) >> 8) + 128)

        uint8_t i_u, i_v;

        for( ; p_in < p_in_end ; )
        {
            p_line_end = p_in + p_pic->p[1].i_visible_pitch - 8;

            for( ; p_in < p_line_end ; )
            {
                /* Do 8 pixels at a time */
                WRITE_UV_CLIP(); WRITE_UV_CLIP();
                WRITE_UV_CLIP(); WRITE_UV_CLIP();
                WRITE_UV_CLIP(); WRITE_UV_CLIP();
                WRITE_UV_CLIP(); WRITE_UV_CLIP();
            }

            p_line_end += 8;

            for( ; p_in < p_line_end ; )
            {
                WRITE_UV_CLIP();
            }

            p_in += p_pic->p[1].i_pitch - p_pic->p[1].i_visible_pitch;
            p_in_v += p_pic->p[2].i_pitch - p_pic->p[2].i_visible_pitch;
            p_out += p_outpic->p[1].i_pitch - p_outpic->p[1].i_visible_pitch;
            p_out_v += p_outpic->p[2].i_pitch - p_outpic->p[2].i_visible_pitch;
        }
    }
    else
    {
#define WRITE_UV() \
    i_u = *p_in++ ; i_v = *p_in_v++ ; \
    *p_out++ = (( ((i_u * i_cos + i_v * i_sin - i_x) >> 8) \
                       * i_sat) >> 8) + 128; \
    *p_out_v++ = (( ((i_v * i_cos - i_u * i_sin - i_y) >> 8) \
                       * i_sat) >> 8) + 128

        uint8_t i_u, i_v;

        for( ; p_in < p_in_end ; )
        {
            p_line_end = p_in + p_pic->p[1].i_visible_pitch - 8;

            for( ; p_in < p_line_end ; )
            {
                /* Do 8 pixels at a time */
                WRITE_UV(); WRITE_UV(); WRITE_UV(); WRITE_UV();
                WRITE_UV(); WRITE_UV(); WRITE_UV(); WRITE_UV();
            }

            p_line_end += 8;

            for( ; p_in < p_line_end ; )
            {
                WRITE_UV();
            }

            p_in += p_pic->p[1].i_pitch - p_pic->p[1].i_visible_pitch;
            p_in_v += p_pic->p[2].i_pitch - p_pic->p[2].i_visible_pitch;
            p_out += p_outpic->p[1].i_pitch - p_outpic->p[1].i_visible_pitch;
            p_out_v += p_outpic->p[2].i_pitch - p_outpic->p[2].i_visible_pitch;
        }
    }

    vout_UnlinkPicture( p_vout->p_sys->p_vout, p_outpic );

    vout_DisplayPicture( p_vout->p_sys->p_vout, p_outpic );
}

/*****************************************************************************
 * SendEvents: forward mouse and keyboard events to the parent p_vout
 *****************************************************************************/
static int SendEvents( vlc_object_t *p_this, char const *psz_var,
                       vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
    var_Set( (vlc_object_t *)p_data, psz_var, newval );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * SendEventsToChild: forward events to the child/children vout
 *****************************************************************************/
static int SendEventsToChild( vlc_object_t *p_this, char const *psz_var,
                       vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;
    var_Set( p_vout->p_sys->p_vout, psz_var, newval );
    return VLC_SUCCESS;
}