video_output.c

vlc stand 0.1.99 ist sehr einfach

            break;
#endif
        }

        if( p_free_picture->p_data != NULL )
        {
            /* Copy picture informations, set some default values */
            p_free_picture->i_type                      = i_type;
            p_free_picture->i_status                    = RESERVED_PICTURE;
            p_free_picture->i_matrix_coefficients       = 1;
            p_free_picture->i_width                     = i_width;
            p_free_picture->i_height                    = i_height;
            p_free_picture->i_chroma_width              = i_chroma_width;
            p_free_picture->i_display_horizontal_offset = 0;
            p_free_picture->i_display_vertical_offset   = 0;
            p_free_picture->i_display_width             = i_width;
            p_free_picture->i_display_height            = i_height;
            p_free_picture->i_aspect_ratio              = AR_SQUARE_PICTURE;
            p_free_picture->i_refcount                  = 0;
            p_vout->i_pictures++;
        }
        else
        {
            /* Memory allocation failed : set picture as empty */
            p_free_picture->i_type   =  EMPTY_PICTURE;
            p_free_picture->i_status =  FREE_PICTURE;
            p_free_picture =            NULL;
            intf_ErrMsg("warning: %s\n", strerror( ENOMEM ) );
        }

#ifdef DEBUG_VIDEO
        intf_DbgMsg("picture %p (in free picture slot)\n", p_free_picture );
#endif
        vlc_mutex_unlock( &p_vout->picture_lock );
        return( p_free_picture );
    }

    /* No free or destroyed picture could be found */
    intf_DbgMsg( "warning: heap is full\n" );
    vlc_mutex_unlock( &p_vout->picture_lock );
    return( NULL );
}

/*****************************************************************************
 * vout_DestroyPicture: remove a permanent or reserved picture from the heap
 *****************************************************************************
 * This function frees a previously reserved picture or a permanent
 * picture. It is meant to be used when the construction of a picture aborted.
 * Note that the picture will be destroyed even if it is linked !
 *****************************************************************************/
void vout_DestroyPicture( vout_thread_t *p_vout, picture_t *p_pic )
{
   vlc_mutex_lock( &p_vout->picture_lock );

#ifdef DEBUG
   /* Check if picture status is valid */
   if( (p_pic->i_status != RESERVED_PICTURE) &&
       (p_pic->i_status != RESERVED_DATED_PICTURE) &&
       (p_pic->i_status != RESERVED_DISP_PICTURE) )
   {
       intf_DbgMsg("error: picture %p has invalid status %d\n", p_pic, p_pic->i_status );
   }
#endif

   p_pic->i_status = DESTROYED_PICTURE;
   p_vout->i_pictures--;

#ifdef DEBUG_VIDEO
   intf_DbgMsg("picture %p\n", p_pic);
#endif
   vlc_mutex_unlock( &p_vout->picture_lock );
}

/*****************************************************************************
 * vout_LinkPicture: increment reference counter of a picture
 *****************************************************************************
 * This function increment the reference counter of a picture in the video
 * heap. It needs a lock since several producer threads can access the picture.
 *****************************************************************************/
void vout_LinkPicture( vout_thread_t *p_vout, picture_t *p_pic )
{
    vlc_mutex_lock( &p_vout->picture_lock );
    p_pic->i_refcount++;

#ifdef DEBUG_VIDEO
    intf_DbgMsg("picture %p refcount=%d\n", p_pic, p_pic->i_refcount );
#endif

    vlc_mutex_unlock( &p_vout->picture_lock );
}

/*****************************************************************************
 * vout_UnlinkPicture: decrement reference counter of a picture
 *****************************************************************************
 * This function decrement the reference counter of a picture in the video heap.
 *****************************************************************************/
void vout_UnlinkPicture( vout_thread_t *p_vout, picture_t *p_pic )
{
    vlc_mutex_lock( &p_vout->picture_lock );
    p_pic->i_refcount--;

#ifdef DEBUG_VIDEO
    if( p_pic->i_refcount < 0 )
    {
        intf_DbgMsg("error: refcount < 0\n");
        p_pic->i_refcount = 0;
    }
#endif

    if( (p_pic->i_refcount == 0) && (p_pic->i_status == DISPLAYED_PICTURE) )
    {
        p_pic->i_status = DESTROYED_PICTURE;
        p_vout->i_pictures--;
    }

#ifdef DEBUG_VIDEO
    intf_DbgMsg("picture %p refcount=%d\n", p_pic, p_pic->i_refcount );
#endif

    vlc_mutex_unlock( &p_vout->picture_lock );
}

/*****************************************************************************
 * vout_SetBuffers: set buffers adresses
 *****************************************************************************
 * This function is called by system drivers to set buffers video memory
 * adresses.
 *****************************************************************************/
void vout_SetBuffers( vout_thread_t *p_vout, void *p_buf1, void *p_buf2 )
{
    /* No picture previously */
    p_vout->p_buffer[0].i_pic_x =         0;
    p_vout->p_buffer[0].i_pic_y =         0;
    p_vout->p_buffer[0].i_pic_width =     0;
    p_vout->p_buffer[0].i_pic_height =    0;
    p_vout->p_buffer[1].i_pic_x =         0;
    p_vout->p_buffer[1].i_pic_y =         0;
    p_vout->p_buffer[1].i_pic_width =     0;
    p_vout->p_buffer[1].i_pic_height =    0;

    /* The first area covers all the screen */
    p_vout->p_buffer[0].i_areas =                 1;
    p_vout->p_buffer[0].pi_area_begin[0] =        0;
    p_vout->p_buffer[0].pi_area_end[0] =          p_vout->i_height - 1;
    p_vout->p_buffer[1].i_areas =                 1;
    p_vout->p_buffer[1].pi_area_begin[0] =        0;
    p_vout->p_buffer[1].pi_area_end[0] =          p_vout->i_height - 1;

    /* Set adresses */
    p_vout->p_buffer[0].p_data = p_buf1;
    p_vout->p_buffer[1].p_data = p_buf2;
}

/*****************************************************************************
 * vout_Pixel2RGB: return red, green and blue from pixel value
 *****************************************************************************
 * Return color values, in 0-255 range, of the decomposition of a pixel. This
 * is a slow routine and should only be used for initialization phase.
 *****************************************************************************/
void vout_Pixel2RGB( vout_thread_t *p_vout, u32 i_pixel, int *pi_red, int *pi_green, int *pi_blue )
{
    *pi_red =   i_pixel & p_vout->i_red_mask;
    *pi_green = i_pixel & p_vout->i_green_mask;
    *pi_blue =  i_pixel & p_vout->i_blue_mask;
}

/* following functions are local */

/*****************************************************************************
 * BinaryLog: computes the base 2 log of a binary value
 *****************************************************************************
 * This functions is used by MaskToShift, to get a bit index from a binary
 * value.
 *****************************************************************************/
static int BinaryLog(u32 i)
{
    int i_log;

    i_log = 0;
    if (i & 0xffff0000)
    {
        i_log = 16;
    }
    if (i & 0xff00ff00)
    {
        i_log += 8;
    }
    if (i & 0xf0f0f0f0)
    {
        i_log += 4;
    }
    if (i & 0xcccccccc)
    {
        i_log += 2;
    }
    if (i & 0xaaaaaaaa)
    {
        i_log++;
    }
    if (i != ((u32)1 << i_log))
    {
        intf_ErrMsg("internal error: binary log overflow\n");
    }

    return( i_log );
}

/*****************************************************************************
 * MaskToShift: transform a color mask into right and left shifts
 *****************************************************************************
 * This function is used for obtaining color shifts from masks.
 *****************************************************************************/
static void MaskToShift( int *pi_left, int *pi_right, u32 i_mask )
{
    u32 i_low, i_high;                 /* lower hand higher bits of the mask */

    /* Get bits */
    i_low =  i_mask & (- i_mask);                   /* lower bit of the mask */
    i_high = i_mask + i_low;                       /* higher bit of the mask */

    /* Transform bits into an index */
    i_low =  BinaryLog (i_low);
    i_high = BinaryLog (i_high);

    /* Update pointers and return */
    *pi_left =   i_low;
    *pi_right = (8 - i_high + i_low);
}

/*****************************************************************************
 * InitThread: initialize video output thread
 *****************************************************************************
 * This function is called from RunThread and performs the second step of the
 * initialization. It returns 0 on success. Note that the thread's flag are not
 * modified inside this function.
 *****************************************************************************/
static int InitThread( vout_thread_t *p_vout )
{
    /* Update status */
    intf_DbgMsg("\n");
    *p_vout->pi_status = THREAD_START;

   /* Initialize output method - this function issues its own error messages */
    if( p_vout->p_sys_init( p_vout ) )
    {
        return( 1 );
    }

    /* Initialize convertion tables and functions */
    if( vout_InitYUV( p_vout ) )
    {
        intf_ErrMsg("error: can't allocate YUV translation tables\n");
        return( 1 );
    }

    /* Mark thread as running and return */
    p_vout->b_active =          1;
    *p_vout->pi_status =        THREAD_READY;
    intf_DbgMsg("thread ready\n");
    return( 0 );
}

/*****************************************************************************
 * RunThread: video output thread
 *****************************************************************************
 * Video output thread. This function does only returns when the thread is
 * terminated. It handles the pictures arriving in the video heap and the
 * display device events.
 *****************************************************************************/
static void RunThread( vout_thread_t *p_vout)
{
    /* XXX?? welcome to gore land */
    static int i_trash_count = 0;
    static mtime_t last_display_date = 0;

    int             i_index;                                /* index in heap */
    mtime_t         current_date;                            /* current date */
    mtime_t         display_date;                            /* display date */
    boolean_t       b_display;                               /* display flag */
    picture_t *     p_pic;                                /* picture pointer */
    subpicture_t *  p_subpic;                          /* subpicture pointer */

    /*
     * Initialize thread
     */
    p_vout->b_error = InitThread( p_vout );
    if( p_vout->b_error )
    {
        DestroyThread( p_vout, THREAD_ERROR );
        return;
    }
    intf_DbgMsg("\n");

    /*
     * Main loop - it is not executed if an error occured during
     * initialization
     */
    while( (!p_vout->b_die) && (!p_vout->b_error) )
    {
        /* Initialize loop variables */
        p_pic =         NULL;
        p_subpic =      NULL;
        display_date =  0;
        current_date =  mdate();

        /*
         * Find the picture to display - this operation does not need lock,
         * since only READY_PICTUREs are handled
         */
        for( i_index = 0; i_index < VOUT_MAX_PICTURES; i_index++ )
        {
            if( (p_vout->p_picture[i_index].i_status == READY_PICTURE) &&
            ( (p_pic == NULL) ||
              (p_vout->p_picture[i_index].date < display_date) ) )
            {
                p_pic = &p_vout->p_picture[i_index];
                display_date = p_pic->date;
            }
        }

        if( p_pic )
        {
#ifdef STATS
            /* Computes FPS rate */
            p_vout->p_fps_sample[ p_vout->c_fps_samples++ % VOUT_FPS_SAMPLES ] = display_date;
#endif
/* XXX?? */
i_trash_count++;
//fprintf( stderr, "gap : %Ld\n", display_date-last_display_date );
last_display_date = display_date;