video_yuvmmx.c 16.2 KB
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/*****************************************************************************
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 * video_yuvmmx.c: MMX YUV transformation functions
 * Provides functions to perform the YUV conversion.
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 *****************************************************************************
 * Copyright (C) 1999, 2000 VideoLAN
 *
 * Authors:
 *
 * 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 02111-1307, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include "defs.h"

#include <math.h>                                            /* exp(), pow() */
#include <errno.h>                                                 /* ENOMEM */
#include <stdlib.h>                                                /* free() */
#include <string.h>                                            /* strerror() */

#include "config.h"
#include "common.h"
#include "threads.h"
#include "mtime.h"
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#include "tests.h"

#include "modules.h"

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#include "video.h"
#include "video_output.h"
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#include "video_common.h"
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#include "intf_msg.h"

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static int     yuv_Probe      ( probedata_t *p_data );
static int     yuv_Init       ( vout_thread_t *p_vout );
static int     yuv_Reset      ( vout_thread_t *p_vout );
static void    yuv_End        ( vout_thread_t *p_vout );

static void    SetYUV         ( vout_thread_t *p_vout );

/*****************************************************************************
 * Functions exported as capabilities. They are declared as static so that
 * we don't pollute the namespace too much.
 *****************************************************************************/
void yuv_getfunctions( function_list_t * p_function_list )
{
    p_function_list->pf_probe = yuv_Probe;
    p_function_list->functions.yuv.pf_init = yuv_Init;
    p_function_list->functions.yuv.pf_reset = yuv_Reset;
    p_function_list->functions.yuv.pf_end = yuv_End;
}

/*****************************************************************************
 * yuv_Probe: tests probe the audio device and return a score
 *****************************************************************************
 * This function tries to open the DSP and returns a score to the plugin
 * manager so that it can choose the most appropriate one.
 *****************************************************************************/
static int yuv_Probe( probedata_t *p_data )
{
    /* Test for MMX support in the CPU */
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    if( TestCPU( CPU_CAPABILITY_MMX ) )
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    {
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        if( TestMethod( YUV_METHOD_VAR, "yuvmmx" ) )
        {
            return( 999 );
        }
        else
        {
            return( 100 );
        }
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    }
    else
    {
        return( 0 );
    }
}

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/*****************************************************************************
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 * yuv_Init: allocate and initialize translations tables
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 *****************************************************************************
 * This function will allocate memory to store translation tables, depending
 * of the screen depth.
 *****************************************************************************/
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static int yuv_Init( vout_thread_t *p_vout )
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{
    size_t      tables_size;                        /* tables size, in bytes */

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    /* Computes tables size for 8bbp only */
    if( p_vout->i_bytes_per_pixel == 1 )
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    {
        tables_size = sizeof( u8 )
                * (p_vout->b_grayscale ? GRAY_TABLE_SIZE : PALETTE_TABLE_SIZE);

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        /* Allocate memory */
        p_vout->yuv.p_base = malloc( tables_size );
        if( p_vout->yuv.p_base == NULL )
        {
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            intf_ErrMsg("error: %s", strerror(ENOMEM));
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            return( 1 );
        }
    }
    else
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    {
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        p_vout->yuv.p_base = NULL;
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    }

    /* Allocate memory for conversion buffer and offset array */
    p_vout->yuv.p_buffer = malloc( VOUT_MAX_WIDTH * p_vout->i_bytes_per_pixel );
    if( p_vout->yuv.p_buffer == NULL )
    {
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        intf_ErrMsg("error: %s", strerror(ENOMEM));
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        free( p_vout->yuv.p_base );
        return( 1 );
    }
    p_vout->yuv.p_offset = malloc( p_vout->i_width * sizeof( int ) );
    if( p_vout->yuv.p_offset == NULL )
    {
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        intf_ErrMsg("error: %s", strerror(ENOMEM));
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        free( p_vout->yuv.p_base );
        free( p_vout->yuv.p_buffer );
        return( 1 );
    }

    /* Initialize tables */
    SetYUV( p_vout );
    return( 0 );
}

/*****************************************************************************
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 * yuv_End: destroy translations tables
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 *****************************************************************************
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 * Free memory allocated by yuv_CCreate.
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 *****************************************************************************/
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static void yuv_End( vout_thread_t *p_vout )
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{
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    free( p_vout->yuv.p_base );
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    free( p_vout->yuv.p_buffer );
    free( p_vout->yuv.p_offset );
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}

/*****************************************************************************
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 * yuv_Reset: re-initialize translations tables
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 *****************************************************************************
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 * This function will initialize the tables allocated by vout_CreateTables and
 * set functions pointers.
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 *****************************************************************************/
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static int yuv_Reset( vout_thread_t *p_vout )
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{
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    yuv_End( p_vout );
    return( yuv_Init( p_vout ) );
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}

/*****************************************************************************
 * SetYUV: compute tables and set function pointers
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 *****************************************************************************/
static void SetYUV( vout_thread_t *p_vout )
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{
    int         i_index;                                  /* index in tables */

    /*
     * Set pointers and build YUV tables
     */
    if( p_vout->b_grayscale )
    {
        /* Grayscale: build gray table */
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        if( p_vout->i_bytes_per_pixel == 1 )
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        {
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            u16 bright[256], transp[256];
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            for( i_index = 0; i_index < 256; i_index++)
            {
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                bright[ i_index ] = i_index << 8;
                transp[ i_index ] = 0;
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            }
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            /* the colors have been allocated, we can set the palette */
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            p_vout->pf_setpalette( p_vout, bright, bright, bright, transp );
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            p_vout->i_white_pixel = 0xff;
            p_vout->i_black_pixel = 0x00;
            p_vout->i_gray_pixel = 0x44;
            p_vout->i_blue_pixel = 0x3b;
        }
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    }
    else
    {
        /* Color: build red, green and blue tables */
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        if( p_vout->i_bytes_per_pixel == 1 )
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        {
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            #define RGB_MIN 0
            #define RGB_MAX 255
            #define CLIP( x ) ( ((x < 0) ? 0 : (x > 255) ? 255 : x) << 8 )
            #define SHIFT 20
            #define U_GREEN_COEF    ((int)(-0.391 * (1<<SHIFT) / 1.164))
            #define U_BLUE_COEF     ((int)(2.018 * (1<<SHIFT) / 1.164))
            #define V_RED_COEF      ((int)(1.596 * (1<<SHIFT) / 1.164))
            #define V_GREEN_COEF    ((int)(-0.813 * (1<<SHIFT) / 1.164))

            int y,u,v;
            int r,g,b;
            int uvr, uvg, uvb;
            int i = 0, j = 0;
            u16 red[256], green[256], blue[256], transp[256];
            unsigned char lookup[PALETTE_TABLE_SIZE];

            p_vout->yuv.yuv.p_rgb8 = (u8 *)p_vout->yuv.p_base;

            /* this loop calculates the intersection of an YUV box
             * and the RGB cube. */
            for ( y = 0; y <= 256; y += 16 )
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            {
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                for ( u = 0; u <= 256; u += 32 )
                for ( v = 0; v <= 256; v += 32 )
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                {
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                    uvr = (V_RED_COEF*(v-128)) >> SHIFT;
                    uvg = (U_GREEN_COEF*(u-128) + V_GREEN_COEF*(v-128)) >> SHIFT;
                    uvb = (U_BLUE_COEF*(u-128)) >> SHIFT;
                    r = y + uvr;
                    g = y + uvg;
                    b = y + uvb;

                    if( r >= RGB_MIN && g >= RGB_MIN && b >= RGB_MIN
                            && r <= RGB_MAX && g <= RGB_MAX && b <= RGB_MAX )
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                    {
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                        /* this one should never happen unless someone fscked up my code */
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                        if(j == 256) { intf_ErrMsg( "vout error: no colors left to build palette" ); break; }
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                        /* clip the colors */
                        red[j] = CLIP( r );
                        green[j] = CLIP( g );
                        blue[j] = CLIP( b );
                        transp[j] = 0;

                        /* allocate color */
                        lookup[i] = 1;
                        p_vout->yuv.yuv.p_rgb8[i++] = j;
                        j++;
                    }
                    else
                    {
                        lookup[i] = 0;
                        p_vout->yuv.yuv.p_rgb8[i++] = 0;
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                    }
                }
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                i += 128-81;
            }
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            /* the colors have been allocated, we can set the palette */
            /* there will eventually be a way to know which colors
             * couldn't be allocated and try to find a replacement */
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            p_vout->pf_setpalette( p_vout, red, green, blue, transp );
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            p_vout->i_white_pixel = 0xff;
            p_vout->i_black_pixel = 0x00;
            p_vout->i_gray_pixel = 0x44;
            p_vout->i_blue_pixel = 0x3b;
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            i = 0;
            /* this loop allocates colors that got outside
             * the RGB cube */
            for ( y = 0; y <= 256; y += 16 )
            {
                for ( u = 0; u <= 256; u += 32 )
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                {
                    for ( v = 0; v <= 256; v += 32 )
                    {
                        int u2, v2;
                        int dist, mindist = 100000000;

                        if( lookup[i] || y==0)
                        {
                            i++;
                            continue;
                        }

                        /* heavy. yeah. */
                        for( u2 = 0; u2 <= 256; u2 += 32 )
                        for( v2 = 0; v2 <= 256; v2 += 32 )
                        {
                            j = ((y>>4)<<7) + (u2>>5)*9 + (v2>>5);
                            dist = (u-u2)*(u-u2) + (v-v2)*(v-v2);
                            if( lookup[j] )
                            /* find the nearest color */
                            if( dist < mindist )
                            {
                                p_vout->yuv.yuv.p_rgb8[i] = p_vout->yuv.yuv.p_rgb8[j];
                                mindist = dist;
                            }
                            j -= 128;
                            if( lookup[j] )
                            /* find the nearest color */
                            if( dist + 128 < mindist )
                            {
                                p_vout->yuv.yuv.p_rgb8[i] = p_vout->yuv.yuv.p_rgb8[j];
                                mindist = dist + 128;
                            }
                        }
                        i++;
                    }
                }
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                i += 128-81;
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            }
        }
    }

    /*
     * Set functions pointers
     */
    if( p_vout->b_grayscale )
    {
        /* Grayscale */
        switch( p_vout->i_bytes_per_pixel )
        {
        case 1:
            p_vout->yuv.p_Convert420 = (vout_yuv_convert_t *) ConvertY4Gray8;
            p_vout->yuv.p_Convert422 = (vout_yuv_convert_t *) ConvertY4Gray8;
            p_vout->yuv.p_Convert444 = (vout_yuv_convert_t *) ConvertY4Gray8;
            break;
        case 2:
            p_vout->yuv.p_Convert420 = (vout_yuv_convert_t *) ConvertY4Gray16;
            p_vout->yuv.p_Convert422 = (vout_yuv_convert_t *) ConvertY4Gray16;
            p_vout->yuv.p_Convert444 = (vout_yuv_convert_t *) ConvertY4Gray16;
            break;
        case 3:
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            p_vout->yuv.p_Convert420 = (vout_yuv_convert_t *) ConvertYUV420RGB24;
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            p_vout->yuv.p_Convert422 = (vout_yuv_convert_t *) ConvertY4Gray24;
            p_vout->yuv.p_Convert444 = (vout_yuv_convert_t *) ConvertY4Gray24;
            break;
        case 4:
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            p_vout->yuv.p_Convert420 = (vout_yuv_convert_t *) ConvertYUV420RGB32;
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            p_vout->yuv.p_Convert422 = (vout_yuv_convert_t *) ConvertY4Gray32;
            p_vout->yuv.p_Convert444 = (vout_yuv_convert_t *) ConvertY4Gray32;
            break;
        }
    }
    else
    {
        /* Color */
        switch( p_vout->i_bytes_per_pixel )
        {
        case 1:
            p_vout->yuv.p_Convert420 = (vout_yuv_convert_t *) ConvertYUV420RGB8;
            p_vout->yuv.p_Convert422 = (vout_yuv_convert_t *) ConvertYUV422RGB8;
            p_vout->yuv.p_Convert444 = (vout_yuv_convert_t *) ConvertYUV444RGB8;
            break;
        case 2:
            p_vout->yuv.p_Convert420 =   (vout_yuv_convert_t *) ConvertYUV420RGB16;
            p_vout->yuv.p_Convert422 =   (vout_yuv_convert_t *) ConvertYUV422RGB16;
            p_vout->yuv.p_Convert444 =   (vout_yuv_convert_t *) ConvertYUV444RGB16;
            break;
        case 3:
            p_vout->yuv.p_Convert420 =   (vout_yuv_convert_t *) ConvertYUV420RGB24;
            p_vout->yuv.p_Convert422 =   (vout_yuv_convert_t *) ConvertYUV422RGB24;
            p_vout->yuv.p_Convert444 =   (vout_yuv_convert_t *) ConvertYUV444RGB24;
            break;
        case 4:
            p_vout->yuv.p_Convert420 =   (vout_yuv_convert_t *) ConvertYUV420RGB32;
            p_vout->yuv.p_Convert422 =   (vout_yuv_convert_t *) ConvertYUV422RGB32;
            p_vout->yuv.p_Convert444 =   (vout_yuv_convert_t *) ConvertYUV444RGB32;
            break;
        }
    }
}

/*****************************************************************************
 * SetOffset: build offset array for conversion functions
 *****************************************************************************
 * This function will build an offset array used in later conversion functions.
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 * It will also set horizontal and vertical scaling indicators. If b_double
 * is set, the p_offset structure has interleaved Y and U/V offsets.
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 *****************************************************************************/
void SetOffset( int i_width, int i_height, int i_pic_width, int i_pic_height,
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                boolean_t *pb_h_scaling, int *pi_v_scaling,
                int *p_offset, boolean_t b_double )
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{
    int i_x;                                    /* x position in destination */
    int i_scale_count;                                     /* modulo counter */

    /*
     * Prepare horizontal offset array
     */
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    if( i_pic_width - i_width == 0 )
    {
        /* No horizontal scaling: YUV conversion is done directly to picture */
        *pb_h_scaling = 0;
    }
    else if( i_pic_width - i_width > 0 )
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    {
        /* Prepare scaling array for horizontal extension */
        *pb_h_scaling =  1;
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        i_scale_count =  i_pic_width;
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        for( i_x = i_width; i_x--; )
        {
            while( (i_scale_count -= i_width) > 0 )
            {
                *p_offset++ = 0;
            }
            *p_offset++ = 1;
            i_scale_count += i_pic_width;
        }
    }
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    else /* if( i_pic_width - i_width < 0 ) */
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    {
        /* Prepare scaling array for horizontal reduction */
        *pb_h_scaling =  1;
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        i_scale_count =  i_width;
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        for( i_x = i_pic_width; i_x--; )
        {
            *p_offset = 1;
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            while( (i_scale_count -= i_pic_width) > 0 )
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            {
                *p_offset += 1;
            }
            p_offset++;
            i_scale_count += i_width;
        }
    }

    /*
     * Set vertical scaling indicator
     */
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    if( i_pic_height - i_height == 0 )
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    {
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        *pi_v_scaling = 0;
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    }
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    else if( i_pic_height - i_height > 0 )
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    {
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        *pi_v_scaling = 1;
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    }
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    else /* if( i_pic_height - i_height < 0 ) */
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    {
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        *pi_v_scaling = -1;
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    }
}