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transform.c：源码内容
							/*****************************************************************************
 * transform.c : transform image module for vlc
 *****************************************************************************
 * Copyright (C) 2000-2004 VideoLAN
 * $Id: transform.c 8551 2004-08-28 17:36:02Z gbazin $
 *
 * Authors: Samuel Hocevar <sam@zoy.org>
 *
 * 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.
 *****************************************************************************/
/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>                                      /* malloc(), free() */
#include <string.h>
#include <vlc/vlc.h>
#include <vlc/vout.h>
#include "filter_common.h"
#define TRANSFORM_MODE_HFLIP   1
#define TRANSFORM_MODE_VFLIP   2
#define TRANSFORM_MODE_90      3
#define TRANSFORM_MODE_180     4
#define TRANSFORM_MODE_270     5
/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int  Create    ( vlc_object_t * );
static void Destroy   ( vlc_object_t * );
static int  Init      ( vout_thread_t * );
static void End       ( vout_thread_t * );
static void Render    ( vout_thread_t *, picture_t * );
static int  SendEvents( vlc_object_t *, char const *,
                        vlc_value_t, vlc_value_t, void * );
/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
#define TYPE_TEXT N_("Transform type")
#define TYPE_LONGTEXT N_("One of '90', '180', '270', 'hflip' and 'vflip'")
static char *type_list[] = { "90", "180", "270", "hflip", "vflip" };
static char *type_list_text[] = { N_("Rotate by 90 degrees"),
  N_("Rotate by 180 degrees"), N_("Rotate by 270 degrees"),
  N_("Flip horizontally"), N_("Flip vertically") };
vlc_module_begin();
    set_description( _("Video transformation filter") );
    set_capability( "video filter", 0 );
    add_string( "transform-type", "90", NULL,
                          TYPE_TEXT, TYPE_LONGTEXT, VLC_FALSE);
        change_string_list( type_list, type_list_text, 0);
    add_shortcut( "transform" );
    set_callbacks( Create, Destroy );
vlc_module_end();
/*****************************************************************************
 * vout_sys_t: Transform video output method descriptor
 *****************************************************************************
 * This structure is part of the video output thread descriptor.
 * It describes the Transform specific properties of an output thread.
 *****************************************************************************/
struct vout_sys_t
{
    int i_mode;
    vlc_bool_t b_rotation;
    vout_thread_t *p_vout;
};
/*****************************************************************************
 * Control: control facility for the vout (forwards to child vout)
 *****************************************************************************/
static int Control( vout_thread_t *p_vout, int i_query, va_list args )
{
    return vout_vaControl( p_vout->p_sys->p_vout, i_query, args );
}
/*****************************************************************************
 * Create: allocates Transform video thread output method
 *****************************************************************************
 * This function allocates and initializes a Transform vout method.
 *****************************************************************************/
static int Create( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;
    char *psz_method;
    /* Allocate structure */
    p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
    if( p_vout->p_sys == NULL )
    {
        msg_Err( p_vout, "out of memory" );
        return VLC_ENOMEM;
    }
    p_vout->pf_init = Init;
    p_vout->pf_end = End;
    p_vout->pf_manage = NULL;
    p_vout->pf_render = Render;
    p_vout->pf_display = NULL;
    p_vout->pf_control = Control;
    /* Look what method was requested */
    psz_method = config_GetPsz( p_vout, "transform-type" );
    if( psz_method == NULL )
    {
        msg_Err( p_vout, "configuration variable %s empty", "transform-type" );
        msg_Err( p_vout, "no valid transform mode provided, using '90'" );
        p_vout->p_sys->i_mode = TRANSFORM_MODE_90;
        p_vout->p_sys->b_rotation = 1;
    }
    else
    {
        if( !strcmp( psz_method, "hflip" ) )
        {
            p_vout->p_sys->i_mode = TRANSFORM_MODE_HFLIP;
            p_vout->p_sys->b_rotation = 0;
        }
        else if( !strcmp( psz_method, "vflip" ) )
        {
            p_vout->p_sys->i_mode = TRANSFORM_MODE_VFLIP;
            p_vout->p_sys->b_rotation = 0;
        }
        else if( !strcmp( psz_method, "90" ) )
        {
            p_vout->p_sys->i_mode = TRANSFORM_MODE_90;
            p_vout->p_sys->b_rotation = 1;
        }
        else if( !strcmp( psz_method, "180" ) )
        {
            p_vout->p_sys->i_mode = TRANSFORM_MODE_180;
            p_vout->p_sys->b_rotation = 0;
        }
        else if( !strcmp( psz_method, "270" ) )
        {
            p_vout->p_sys->i_mode = TRANSFORM_MODE_270;
            p_vout->p_sys->b_rotation = 1;
        }
        else
        {
            msg_Err( p_vout, "no valid transform mode provided, using '90'" );
            p_vout->p_sys->i_mode = TRANSFORM_MODE_90;
            p_vout->p_sys->b_rotation = 1;
        }
        free( psz_method );
    }
    return VLC_SUCCESS;
}
/*****************************************************************************
 * Init: initialize Transform video thread output method
 *****************************************************************************/
static int Init( vout_thread_t *p_vout )
{
    int i_index;
    picture_t *p_pic;
    I_OUTPUTPICTURES = 0;
    /* Initialize the output structure */
    p_vout->output.i_chroma = p_vout->render.i_chroma;
    p_vout->output.i_width  = p_vout->render.i_width;
    p_vout->output.i_height = p_vout->render.i_height;
    p_vout->output.i_aspect = p_vout->render.i_aspect;
    /* Try to open the real video output */
    msg_Dbg( p_vout, "spawning the real video output" );
    if( p_vout->p_sys->b_rotation )
    {
        p_vout->p_sys->p_vout = vout_Create( p_vout,
                           p_vout->render.i_height, p_vout->render.i_width,
                           p_vout->render.i_chroma,
                           (uint64_t)VOUT_ASPECT_FACTOR
                            * (uint64_t)VOUT_ASPECT_FACTOR
                            / (uint64_t)p_vout->render.i_aspect );
    }
    else
    {
        p_vout->p_sys->p_vout = vout_Create( p_vout,
                           p_vout->render.i_width, p_vout->render.i_height,
                           p_vout->render.i_chroma, p_vout->render.i_aspect );
    }
    /* Everything failed */
    if( p_vout->p_sys->p_vout == NULL )
    {
        msg_Err( p_vout, "cannot open vout, aborting" );
        return VLC_EGENERIC;
    }
    ALLOCATE_DIRECTBUFFERS( VOUT_MAX_PICTURES );
    ADD_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );
    ADD_PARENT_CALLBACKS( SendEventsToChild );
    return VLC_SUCCESS;
}
/*****************************************************************************
 * End: terminate Transform video thread output method
 *****************************************************************************/
static void End( vout_thread_t *p_vout )
{
    int i_index;
    /* Free the fake output buffers we allocated */
    for( i_index = I_OUTPUTPICTURES ; i_index ; )
    {
        i_index--;
        free( PP_OUTPUTPICTURE[ i_index ]->p_data_orig );
    }
}
/*****************************************************************************
 * Destroy: destroy Transform video thread output method
 *****************************************************************************
 * Terminate an output method created by TransformCreateOutputMethod
 *****************************************************************************/
static void Destroy( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;
    if( p_vout->p_sys->p_vout )
    {
        DEL_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );
        vlc_object_detach( p_vout->p_sys->p_vout );
        vout_Destroy( p_vout->p_sys->p_vout );
    }
    DEL_PARENT_CALLBACKS( SendEventsToChild );
    free( p_vout->p_sys );
}
/*****************************************************************************
 * Render: displays previously rendered output
 *****************************************************************************
 * This function send the currently rendered image to Transform 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 )
{
    picture_t *p_outpic;
    int i_index;
    /* 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 );
    switch( p_vout->p_sys->i_mode )
    {
        case TRANSFORM_MODE_90:
            for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
            {
                int i_pitch = p_pic->p[i_index].i_pitch;
                uint8_t *p_in = p_pic->p[i_index].p_pixels;
                uint8_t *p_out = p_outpic->p[i_index].p_pixels;
                uint8_t *p_out_end = p_out +
                    p_outpic->p[i_index].i_visible_lines *
                    p_outpic->p[i_index].i_pitch;
                for( ; p_out < p_out_end ; )
                {
                    uint8_t *p_line_end;
                    p_out_end -= p_outpic->p[i_index].i_pitch
                                  - p_outpic->p[i_index].i_visible_pitch;
                    p_line_end = p_in + p_pic->p[i_index].i_visible_lines *
                        i_pitch;
                    for( ; p_in < p_line_end ; )
                    {
                        p_line_end -= i_pitch;
                        *(--p_out_end) = *p_line_end;
                    }
                    p_in++;
                }
            }
            break;
        case TRANSFORM_MODE_180:
            for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
            {
                uint8_t *p_in = p_pic->p[i_index].p_pixels;
                uint8_t *p_in_end = p_in + p_pic->p[i_index].i_visible_lines
                                            * p_pic->p[i_index].i_pitch;
                uint8_t *p_out = p_outpic->p[i_index].p_pixels;
                for( ; p_in < p_in_end ; )
                {
                    uint8_t *p_line_start = p_in_end
                                             - p_pic->p[i_index].i_pitch;
                    p_in_end -= p_pic->p[i_index].i_pitch
                                 - p_pic->p[i_index].i_visible_pitch;
                    for( ; p_line_start < p_in_end ; )
                    {
                        *p_out++ = *(--p_in_end);
                    }
                    p_out += p_outpic->p[i_index].i_pitch
                              - p_outpic->p[i_index].i_visible_pitch;
                }
            }
            break;
        case TRANSFORM_MODE_270:
            for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
            {
                int i_pitch = p_pic->p[i_index].i_pitch;
                uint8_t *p_in = p_pic->p[i_index].p_pixels;
                uint8_t *p_out = p_outpic->p[i_index].p_pixels;
                uint8_t *p_out_end = p_out +
                    p_outpic->p[i_index].i_visible_lines *
                    p_outpic->p[i_index].i_pitch;
                for( ; p_out < p_out_end ; )
                {
                    uint8_t *p_in_end;
                    p_in_end = p_in + p_pic->p[i_index].i_visible_lines *
                        i_pitch;
                    for( ; p_in < p_in_end ; )
                    {
                        p_in_end -= i_pitch;
                        *p_out++ = *p_in_end;
                    }
                    p_out += p_outpic->p[i_index].i_pitch
                              - p_outpic->p[i_index].i_visible_pitch;
                    p_in++;
                }
            }
            break;
        case TRANSFORM_MODE_HFLIP:
            for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
            {
                uint8_t *p_in = p_pic->p[i_index].p_pixels;
                uint8_t *p_in_end = p_in + p_pic->p[i_index].i_visible_lines
                                            * p_pic->p[i_index].i_pitch;
                uint8_t *p_out = p_outpic->p[i_index].p_pixels;
                for( ; p_in < p_in_end ; )
                {
                    p_in_end -= p_pic->p[i_index].i_pitch;
                    p_vout->p_vlc->pf_memcpy( p_out, p_in_end,
                                           p_pic->p[i_index].i_visible_pitch );
                    p_out += p_pic->p[i_index].i_pitch;
                }
            }
            break;
        case TRANSFORM_MODE_VFLIP:
            for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
            {
                uint8_t *p_in = p_pic->p[i_index].p_pixels;
                uint8_t *p_in_end = p_in + p_pic->p[i_index].i_visible_lines
                                            * p_pic->p[i_index].i_pitch;
                uint8_t *p_out = p_outpic->p[i_index].p_pixels;
                for( ; p_in < p_in_end ; )
                {
                    uint8_t *p_line_end = p_in
                                           + p_pic->p[i_index].i_visible_pitch;
                    for( ; p_in < p_line_end ; )
                    {
                        *p_out++ = *(--p_line_end);
                    }
                    p_in += p_pic->p[i_index].i_pitch;
                }
            }
            break;
        default:
            break;
    }
    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_vout )
{
    vout_thread_t *p_vout = (vout_thread_t *)_p_vout;
    vlc_value_t sentval = newval;
    /* Translate the mouse coordinates */
    if( !strcmp( psz_var, "mouse-x" ) )
    {
        switch( p_vout->p_sys->i_mode )
        {
        case TRANSFORM_MODE_270:
            sentval.i_int = p_vout->p_sys->p_vout->output.i_width
                             - sentval.i_int;
        case TRANSFORM_MODE_90:
            var_Set( p_vout, "mouse-y", sentval );
            return VLC_SUCCESS;
        case TRANSFORM_MODE_180:
        case TRANSFORM_MODE_HFLIP:
            sentval.i_int = p_vout->p_sys->p_vout->output.i_width
                             - sentval.i_int;
            break;
        case TRANSFORM_MODE_VFLIP:
        default:
            break;
        }
    }
    else if( !strcmp( psz_var, "mouse-y" ) )
    {
        switch( p_vout->p_sys->i_mode )
        {
        case TRANSFORM_MODE_90:
            sentval.i_int = p_vout->p_sys->p_vout->output.i_height
                             - sentval.i_int;
        case TRANSFORM_MODE_270:
            var_Set( p_vout, "mouse-x", sentval );
            return VLC_SUCCESS;
        case TRANSFORM_MODE_180:
        case TRANSFORM_MODE_VFLIP:
            sentval.i_int = p_vout->p_sys->p_vout->output.i_height
                             - sentval.i_int;
            break;
        case TRANSFORM_MODE_HFLIP:
        default:
            break;
        }
    }
    var_Set( p_vout, psz_var, sentval );
    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;
}

						