adjust.c

VLC Player Source Code

        uint8_t i_u, i_v;

        for( ; p_in < p_in_end ; )
        {
            p_line_end = p_in + p_pic->p[U_PLANE].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[U_PLANE].i_pitch
                  - p_pic->p[U_PLANE].i_visible_pitch;
            p_in_v += p_pic->p[V_PLANE].i_pitch
                    - p_pic->p[V_PLANE].i_visible_pitch;
            p_out += p_outpic->p[U_PLANE].i_pitch
                   - p_outpic->p[U_PLANE].i_visible_pitch;
            p_out_v += p_outpic->p[V_PLANE].i_pitch
                     - p_outpic->p[V_PLANE].i_visible_pitch;
        }
#undef WRITE_UV_CLIP
    }
    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[U_PLANE].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[U_PLANE].i_pitch
                  - p_pic->p[U_PLANE].i_visible_pitch;
            p_in_v += p_pic->p[V_PLANE].i_pitch
                    - p_pic->p[V_PLANE].i_visible_pitch;
            p_out += p_outpic->p[U_PLANE].i_pitch
                   - p_outpic->p[U_PLANE].i_visible_pitch;
            p_out_v += p_outpic->p[V_PLANE].i_pitch
                     - p_outpic->p[V_PLANE].i_visible_pitch;
        }
#undef WRITE_UV
    }

    return CopyInfoAndRelease( p_outpic, p_pic );
}

/*****************************************************************************
 * Run the filter on a Packed YUV picture
 *****************************************************************************/
static picture_t *FilterPacked( filter_t *p_filter, 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;
    int i_y_offset, i_u_offset, i_v_offset;

    int i_lines, i_visible_lines, i_pitch, i_visible_pitch;

    bool 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;

    filter_sys_t *p_sys = p_filter->p_sys;

    if( !p_pic ) return NULL;

    i_lines = p_pic->p->i_lines;
    i_visible_lines = p_pic->p->i_visible_lines;
    i_pitch = p_pic->p->i_pitch;
    i_visible_pitch = p_pic->p->i_visible_pitch;

    if( GetPackedYuvOffsets( p_pic->format.i_chroma, &i_y_offset,
                             &i_u_offset, &i_v_offset ) != VLC_SUCCESS )
    {
        msg_Warn( p_filter, "Unsupported input chroma (%4s)",
                  (char*)&(p_pic->format.i_chroma) );

        picture_Release( p_pic );
        return NULL;
    }

    p_outpic = p_filter->pf_vout_buffer_new( p_filter );
    if( !p_outpic )
    {
        msg_Warn( p_filter, "can't get output picture" );

        picture_Release( p_pic );
        return NULL;
    }

    /* Getvariables */
    i_cont = (int)( p_sys->f_contrast * 255 );
    i_lum = (int)( (p_sys->f_brightness - 1.0)*255 );
    f_hue = (float)( p_sys->i_hue * M_PI / 180 );
    i_sat = (int)( p_sys->f_saturation * 256 );
    f_gamma = 1.0 / p_sys->f_gamma;
    b_thres = p_sys->b_brightness_threshold;

    /*
     * Threshold mode drops out everything about luma, contrast and gamma.
     */
    if( b_thres != 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_uint8_vlc( 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_uint8_vlc( 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->p_pixels + i_y_offset;
    p_in_end = p_in + p_pic->p->i_visible_lines * p_pic->p->i_pitch - 8 * 4;

    p_out = p_outpic->p->p_pixels + i_y_offset;

    for( ; p_in < p_in_end ; )
    {
        p_line_end = p_in + i_visible_pitch - 8 * 4;

        for( ; p_in < p_line_end ; )
        {
            /* Do 8 pixels at a time */
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
        }

        p_line_end += 8 * 4;

        for( ; p_in < p_line_end ; )
        {
            *p_out = pi_luma[ *p_in ]; p_in += 2; p_out += 2;
        }

        p_in += i_pitch - p_pic->p->i_visible_pitch;
        p_out += i_pitch - p_outpic->p->i_visible_pitch;
    }

    /*
     * Do the U and V planes
     */

    p_in = p_pic->p->p_pixels + i_u_offset;
    p_in_v = p_pic->p->p_pixels + i_v_offset;
    p_in_end = p_in + i_visible_lines * i_pitch - 8 * 4;

    p_out = p_outpic->p->p_pixels + i_u_offset;
    p_out_v = p_outpic->p->p_pixels + i_v_offset;

    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; p_in += 4; i_v = *p_in_v; p_in_v += 4; \
    *p_out = clip_uint8_vlc( (( ((i_u * i_cos + i_v * i_sin - i_x) >> 8) \
                           * i_sat) >> 8) + 128); \
    p_out += 4; \
    *p_out_v = clip_uint8_vlc( (( ((i_v * i_cos - i_u * i_sin - i_y) >> 8) \
                           * i_sat) >> 8) + 128); \
    p_out_v += 4

        uint8_t i_u, i_v;

        for( ; p_in < p_in_end ; )
        {
            p_line_end = p_in + i_visible_pitch - 8 * 4;

            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 * 4;

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

            p_in += i_pitch - i_visible_pitch;
            p_in_v += i_pitch - i_visible_pitch;
            p_out += i_pitch - i_visible_pitch;
            p_out_v += i_pitch - i_visible_pitch;
        }
#undef WRITE_UV_CLIP
    }
    else
    {
#define WRITE_UV() \
    i_u = *p_in; p_in += 4; i_v = *p_in_v; p_in_v += 4; \
    *p_out = (( ((i_u * i_cos + i_v * i_sin - i_x) >> 8) \
                       * i_sat) >> 8) + 128; \
    p_out += 4; \
    *p_out_v = (( ((i_v * i_cos - i_u * i_sin - i_y) >> 8) \
                       * i_sat) >> 8) + 128; \
    p_out_v += 4

        uint8_t i_u, i_v;

        for( ; p_in < p_in_end ; )
        {
            p_line_end = p_in + i_visible_pitch - 8 * 4;

            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 * 4;

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

            p_in += i_pitch - i_visible_pitch;
            p_in_v += i_pitch - i_visible_pitch;
            p_out += i_pitch - i_visible_pitch;
            p_out_v += i_pitch - i_visible_pitch;
        }
#undef WRITE_UV
    }

    return CopyInfoAndRelease( p_outpic, p_pic );
}

static int AdjustCallback( vlc_object_t *p_this, char const *psz_var,
                           vlc_value_t oldval, vlc_value_t newval,
                           void *p_data )
{
    VLC_UNUSED(p_this); VLC_UNUSED(oldval);
    filter_sys_t *p_sys = (filter_sys_t *)p_data;

    if( !strcmp( psz_var, "contrast" ) )
        p_sys->f_contrast = newval.f_float;
    else if( !strcmp( psz_var, "brightness" ) )
        p_sys->f_brightness = newval.f_float;
    else if( !strcmp( psz_var, "hue" ) )
        p_sys->i_hue = newval.i_int;
    else if( !strcmp( psz_var, "saturation" ) )
        p_sys->f_saturation = newval.f_float;
    else if( !strcmp( psz_var, "gamma" ) )
        p_sys->f_gamma = newval.f_float;
    else if( !strcmp( psz_var, "brightness-threshold" ) )
        p_sys->b_brightness_threshold = newval.b_bool;
    else
        return VLC_EGENERIC;
    return VLC_SUCCESS;
}