transform.c

uclinux 下的vlc播放器源代码

/*****************************************************************************
 * transform.c : transform image module for vlc
 *****************************************************************************
 * Copyright (C) 2000-2004 the VideoLAN team
 * $Id: transform.c 17012 2006-10-09 22:11:32Z xtophe $
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, 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_shortname( _("Transformation"));
    set_capability( "video filter", 0 );
    set_category( CAT_VIDEO );
    set_subcategory( SUBCAT_VIDEO_VFILTER );

    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;
    video_format_t fmt = {0};

    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;
    p_vout->fmt_out = p_vout->fmt_in;
    fmt = p_vout->fmt_out;

    /* Try to open the real video output */
    msg_Dbg( p_vout, "spawning the real video output" );

    if( p_vout->p_sys->b_rotation )
    {
        fmt.i_width = p_vout->fmt_out.i_height;
        fmt.i_visible_width = p_vout->fmt_out.i_visible_height;
        fmt.i_x_offset = p_vout->fmt_out.i_y_offset;

        fmt.i_height = p_vout->fmt_out.i_width;
        fmt.i_visible_height = p_vout->fmt_out.i_visible_width;
        fmt.i_y_offset = p_vout->fmt_out.i_x_offset;

        fmt.i_aspect = VOUT_ASPECT_FACTOR *
            (uint64_t)VOUT_ASPECT_FACTOR / fmt.i_aspect;

        fmt.i_sar_num = p_vout->fmt_out.i_sar_den;
        fmt.i_sar_den = p_vout->fmt_out.i_sar_num;
    }

    p_vout->p_sys->p_vout = vout_Create( p_vout, &fmt );

    /* 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;