video_output.c 51.7 KB
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/*******************************************************************************
 * video_output.c : video output thread
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 * (c)2000 VideoLAN
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 *******************************************************************************
 * This module describes the programming interface for video output threads.
 * It includes functions allowing to open a new thread, send pictures to a
 * thread, and destroy a previously oppenned video output thread.
 *******************************************************************************/

/*******************************************************************************
 * Preamble
 *******************************************************************************/
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#include <errno.h>
#include <math.h> 
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
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#ifdef VIDEO_X11
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#include <X11/Xlib.h>                           /* for video_sys.h in X11 mode */
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#endif
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#include "common.h"
#include "config.h"
#include "mtime.h"
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#include "vlc_thread.h"
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#include "video.h"
#include "video_output.h"
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#include "video_sys.h"
#include "intf_msg.h"
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#include "main.h"
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/*******************************************************************************
 * Macros
 *******************************************************************************/
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/* CLIP_BYTE: return value if between 0 and 255, else return nearest boundary 
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 * (0 or 255), used to build translations tables */
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#define CLIP_BYTE( i_val ) ( (i_val < 0) ? 0 : ((i_val > 255) ? 255 : i_val) )

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/* YUV_GRAYSCALE: parametric macro for YUV grayscale transformation.
 * Due to the high performance need of this loop, all possible conditions 
 * evaluations are made outside the transformation loop. However, the code does 
 * not change much for two different loops. This macro allows to change slightly
 * the content of the loop without having to copy and paste code. It is used in 
 * RenderYUVPicture function. */
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#define YUV_GRAYSCALE( TRANS_GRAY, P_PIC )                              \
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/* Main loop */                                                         \
for (i_pic_y=0; i_pic_y < p_pic->i_height ; i_pic_y++)                  \
{                                                                       \
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    for (i_pic_x=0; i_pic_x< p_pic->i_width; i_pic_x+=16)               \
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    {                                                                   \
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        /* Convert 16 pixels (width is always multiple of 16 */         \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
        *P_PIC++ = TRANS_GRAY[ *p_y++ ];                                \
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    }                                                                   \
    /* Skip until beginning of next line */                             \
    P_PIC += i_eol_offset;                                              \
}                                                                       

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/* YUV_TRANSFORM: parametric macro for YUV transformation.
 * Due to the high performance need of this loop, all possible conditions 
 * evaluations are made outside the transformation loop. However, the code does 
 * not change much for two different loops. This macro allows to change slightly
 * the content of the loop without having to copy and paste code. It is used in 
 * RenderYUVPicture function. */
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#define YUV_TRANSFORM( CHROMA, TRANS_RED, TRANS_GREEN, TRANS_BLUE, P_PIC ) \
/* Main loop */                                                         \
for (i_pic_y=0; i_pic_y < p_pic->i_height ; i_pic_y++)                  \
{                                                                       \
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    for (i_pic_x=0; i_pic_x< p_pic->i_width; i_pic_x+=2 )               \
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    {                                                                   \
        /* First sample (complete) */                                   \
        i_y = 76309 * *p_y++ - 1188177;                                 \
        i_u = *p_u++ - 128;                                             \
        i_v = *p_v++ - 128;                                             \
        *P_PIC++ =                                                      \
            TRANS_RED   [(i_y+i_crv*i_v)                >>16] |         \
            TRANS_GREEN [(i_y-i_cgu*i_u-i_cgv*i_v)      >>16] |         \
            TRANS_BLUE  [(i_y+i_cbu*i_u)                >>16];          \
        i_y = 76309 * *p_y++ - 1188177;                                 \
        /* Second sample (partial) */                                   \
        if( CHROMA == 444 )                                             \
        {                                                               \
            i_u = *p_u++ - 128;                                         \
            i_v = *p_v++ - 128;                                         \
        }                                                               \
        *P_PIC++ =                                                      \
            TRANS_RED   [(i_y+i_crv*i_v)                >>16] |         \
            TRANS_GREEN [(i_y-i_cgu*i_u-i_cgv*i_v)      >>16] |         \
            TRANS_BLUE  [(i_y+i_cbu*i_u)                >>16];          \
    }                                                                   \
    if( (CHROMA == 420) && !(i_pic_y & 0x1) )                           \
    {                                                                   \
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        p_u -= i_chroma_width;                                          \
        p_v -= i_chroma_width;                                          \
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    }                                                                   \
    /* Skip until beginning of next line */                             \
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    P_PIC += i_eol_offset;                                              \
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}

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/*******************************************************************************
 * Constants
 *******************************************************************************/
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/* RGB/YUV inversion matrix (ISO/IEC 13818-2 section 6.3.6, table 6.9) */
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const int MATRIX_COEFFICIENTS_TABLE[8][4] =
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{
  {117504, 138453, 13954, 34903},       /* no sequence_display_extension */
  {117504, 138453, 13954, 34903},       /* ITU-R Rec. 709 (1990) */
  {104597, 132201, 25675, 53279},       /* unspecified */
  {104597, 132201, 25675, 53279},       /* reserved */
  {104448, 132798, 24759, 53109},       /* FCC */
  {104597, 132201, 25675, 53279},       /* ITU-R Rec. 624-4 System B, G */
  {104597, 132201, 25675, 53279},       /* SMPTE 170M */
  {117579, 136230, 16907, 35559}        /* SMPTE 240M (1987) */
};

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/*******************************************************************************
 * External prototypes
 *******************************************************************************/
#ifdef HAVE_MMX
/* YUV transformations for MMX - in yuv-mmx.S 
 *      p_y, p_u, p_v:          Y U and V planes
 *      i_width, i_height:      frames dimensions (pixels)
 *      i_ypitch, i_vpitch:     Y and V lines sizes (bytes)
 *      i_aspect:               vertical aspect factor
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 *      p_pic:                  RGB frame
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 *      i_dci_offset:           ?? x offset for left image border
 *      i_offset_to_line_0:     ?? x offset for left image border
 *      i_pitch:                RGB line size (bytes)
 *      i_colortype:            0 for 565, 1 for 555 */
void vout_YUV420_16_MMX( u8* p_y, u8* p_u, u8 *p_v, 
                         unsigned int i_width, unsigned int i_height,
                         unsigned int i_ypitch, unsigned int i_vpitch,
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                         unsigned int i_aspect, u8 *p_pic, 
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                         u32 i_dci_offset, u32 i_offset_to_line_0,
                         int CCOPitch, int i_colortype );
#endif

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/*******************************************************************************
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 * Local prototypes
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 *******************************************************************************/
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static int      InitThread              ( vout_thread_t *p_vout );
static void     RunThread               ( vout_thread_t *p_vout );
static void     ErrorThread             ( vout_thread_t *p_vout );
static void     EndThread               ( vout_thread_t *p_vout );
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static void     BuildTables             ( vout_thread_t *p_vout );
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static void     RenderPicture           ( vout_thread_t *p_vout, picture_t *p_pic );
static void     RenderYUVGrayPicture    ( vout_thread_t *p_vout, picture_t *p_pic );
static void     RenderYUV16Picture      ( vout_thread_t *p_vout, picture_t *p_pic );
static void     RenderYUV32Picture      ( vout_thread_t *p_vout, picture_t *p_pic );
static void     RenderInfo              ( vout_thread_t *p_vout );
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static int      RenderIdle              ( vout_thread_t *p_vout, int i_level );
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/*******************************************************************************
 * vout_CreateThread: creates a new video output thread
 *******************************************************************************
 * This function creates a new video output thread, and returns a pointer
 * to its description. On error, it returns NULL.
 * If pi_status is NULL, then the function will block until the thread is ready.
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 * If not, it will be updated using one of the THREAD_* constants.
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 *******************************************************************************/
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vout_thread_t * vout_CreateThread               ( 
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#ifdef VIDEO_X11
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                                                  char *psz_display, Window root_window, 
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#endif
                                                  int i_width, int i_height, int *pi_status 
                                                )
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{
    vout_thread_t * p_vout;                               /* thread descriptor */
    int             i_status;                                 /* thread status */

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    /* Allocate descriptor */
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    p_vout = (vout_thread_t *) malloc( sizeof(vout_thread_t) );
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    if( p_vout == NULL )
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    {
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        intf_ErrMsg("error: %s\n", strerror(ENOMEM));        
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        return( NULL );
    }
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    /* Initialize some fields used by the system-dependant method - these fields will
     * probably be modified by the method */
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#ifdef DEBUG
    p_vout->b_info              = 1;    
#else
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    p_vout->b_info              = 0;    
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#endif
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    p_vout->b_grayscale         = main_GetIntVariable( VOUT_GRAYSCALE_VAR, 
                                                       VOUT_GRAYSCALE_DEFAULT );
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    p_vout->i_width             = i_width;
    p_vout->i_height            = i_height;
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    p_vout->i_bytes_per_line    = i_width * 2;    
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    p_vout->i_screen_depth      = 15;
    p_vout->i_bytes_per_pixel   = 2;
    p_vout->f_x_ratio           = 1;
    p_vout->f_y_ratio           = 1;
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    p_vout->f_gamma             = VOUT_GAMMA;    
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    intf_DbgMsg("wished configuration: %dx%d,%d (%d bytes/pixel, %d bytes/line), ratio %.2f:%.2f, gray=%d\n",
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                p_vout->i_width, p_vout->i_height, p_vout->i_screen_depth,
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                p_vout->i_bytes_per_pixel, p_vout->i_bytes_per_line,
                p_vout->f_x_ratio, p_vout->f_y_ratio, p_vout->b_grayscale );
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    /* Create and initialize system-dependant method - this function issues its
     * own error messages */
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    if( vout_SysCreate( p_vout
#if defined(VIDEO_X11)
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                        , psz_display, root_window 
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#endif
        ) )
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    {
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      free( p_vout );
      return( NULL );
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    }
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    intf_DbgMsg("actual configuration: %dx%d,%d (%d bytes/pixel, %d bytes/line), ratio %.2f:%.2f, gray=%d\n",
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                p_vout->i_width, p_vout->i_height, p_vout->i_screen_depth,
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                p_vout->i_bytes_per_pixel, p_vout->i_bytes_per_line,
                p_vout->f_x_ratio, p_vout->f_y_ratio, p_vout->b_grayscale );
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    /* Terminate the initialization */
    p_vout->b_die               = 0;
    p_vout->b_error             = 0;    
    p_vout->b_active            = 0;
    p_vout->pi_status           = (pi_status != NULL) ? pi_status : &i_status;
    *p_vout->pi_status          = THREAD_CREATE;    
#ifdef STATS
    p_vout->c_loops             = 0;
    p_vout->c_idle_loops        = 0;
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    p_vout->c_fps_samples       = 0;
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#endif      
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    p_vout->b_gamma_change      = 0;
    p_vout->i_new_width         = p_vout->i_width;
    p_vout->i_new_height        = p_vout->i_height;    
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    /* Create thread and set locks */
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    vlc_mutex_init( &p_vout->lock );
    if( vlc_thread_create( &p_vout->thread_id, "video output", 
			   (void *) RunThread, (void *) p_vout) )
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    {
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        intf_ErrMsg("error: %s\n", strerror(ENOMEM));
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	vout_SysDestroy( p_vout );
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        free( p_vout );
        return( NULL );
    }   

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    intf_Msg("Video: display initialized (%dx%d, %d bpp)\n", 
             p_vout->i_width, p_vout->i_height, p_vout->i_screen_depth );    

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    /* If status is NULL, wait until the thread is created */
    if( pi_status == NULL )
    {
        do
        {            
            msleep( THREAD_SLEEP );
        }while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR) 
                && (i_status != THREAD_FATAL) );
        if( i_status != THREAD_READY )
        {
            return( NULL );            
        }        
    }
    return( p_vout );
}

/*******************************************************************************
 * vout_DestroyThread: destroys a previously created thread
 *******************************************************************************
 * Destroy a terminated thread. 
 * The function will request a destruction of the specified thread. If pi_error
 * is NULL, it will return once the thread is destroyed. Else, it will be 
 * update using one of the THREAD_* constants.
 *******************************************************************************/
void vout_DestroyThread( vout_thread_t *p_vout, int *pi_status )
{  
    int     i_status;                                         /* thread status */

    /* Set status */
    p_vout->pi_status = (pi_status != NULL) ? pi_status : &i_status;
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    *p_vout->pi_status = THREAD_DESTROY;    
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    /* Request thread destruction */
    p_vout->b_die = 1;

    /* If status is NULL, wait until thread has been destroyed */
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    if( pi_status == NULL )
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    {
        do
        {
            msleep( THREAD_SLEEP );
        }while( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR) 
                && (i_status != THREAD_FATAL) );   
    }
}

/*******************************************************************************
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 * vout_DisplayPicture: display a picture
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 *******************************************************************************
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 * Remove the reservation flag of a picture, which will cause it to be ready for
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 * display. The picture does not need to be locked, since it is ignored by
 * the output thread if is reserved.
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 *******************************************************************************/
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void  vout_DisplayPicture( vout_thread_t *p_vout, picture_t *p_pic )
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{
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#ifdef DEBUG_VIDEO
    char        psz_date[MSTRTIME_MAX_SIZE];         /* buffer for date string */
#endif

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#ifdef DEBUG
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    /* Check if picture status is valid */
    if( p_pic->i_status != RESERVED_PICTURE )
    {
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        intf_DbgMsg("error: picture %d has invalid status %d\n", p_pic, p_pic->i_status );       
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    }   
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#endif
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    /* Remove reservation flag */
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    p_pic->i_status = READY_PICTURE;
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#ifdef DEBUG_VIDEO
    /* Send picture informations */
    intf_DbgMsg("picture %p: type=%d, %dx%d, date=%s\n", p_pic, p_pic->i_type, 
                p_pic->i_width,p_pic->i_height, mstrtime( psz_date, p_pic->date ) );    
#endif
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}

/*******************************************************************************
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 * vout_CreatePicture: allocate a picture in the video output heap.
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 *******************************************************************************
 * This function create a reserved image in the video output heap. 
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 * A null pointer is returned if the function fails. This method provides an
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 * already allocated zone of memory in the picture data fields. It needs locking
 * since several pictures can be created by several producers threads.
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 *******************************************************************************/
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picture_t *vout_CreatePicture( vout_thread_t *p_vout, int i_type, 
			       int i_width, int i_height, int i_bytes_per_line )
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{
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    int         i_picture;                                    /* picture index */
    picture_t * p_free_picture = NULL;                   /* first free picture */    
    picture_t * p_destroyed_picture = NULL;         /* first destroyed picture */    
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    /* Get lock */
    vlc_mutex_lock( &p_vout->lock );
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    /* 
     * Look for an empty place 
     */
    for( i_picture = 0; 
         i_picture < VOUT_MAX_PICTURES; 
         i_picture++ )
    {
	if( p_vout->p_picture[i_picture].i_status == DESTROYED_PICTURE )
	{
	    /* Picture is marked for destruction, but is still allocated */
	    if( (p_vout->p_picture[i_picture].i_type           == i_type)   &&
		(p_vout->p_picture[i_picture].i_height         == i_height) &&
		(p_vout->p_picture[i_picture].i_bytes_per_line == i_bytes_per_line) )
	    {
		/* Memory size do match : memory will not be reallocated, and function
                 * can end immediately - this is the best possible case, since no
                 * memory allocation needs to be done */
		p_vout->p_picture[i_picture].i_width  = i_width;
		p_vout->p_picture[i_picture].i_status = RESERVED_PICTURE;
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#ifdef DEBUG_VIDEO
                intf_DbgMsg("picture %p (in destroyed picture slot)\n", 
                            &p_vout->p_picture[i_picture] );                
#endif
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		vlc_mutex_unlock( &p_vout->lock );
		return( &p_vout->p_picture[i_picture] );
	    }
	    else if( p_destroyed_picture == NULL )
	    {
		/* Memory size do not match, but picture index will be kept in
		 * case no other place are left */
		p_destroyed_picture = &p_vout->p_picture[i_picture];                
	    }	    
	}
        else if( (p_free_picture == NULL) && 
                 (p_vout->p_picture[i_picture].i_status == FREE_PICTURE ))
        {
	    /* Picture is empty and ready for allocation */
            p_free_picture = &p_vout->p_picture[i_picture];            
        }
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    }

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    /* If no free picture is available, use a destroyed picture */
    if( (p_free_picture == NULL) && (p_destroyed_picture != NULL ) )
    { 
	/* No free picture or matching destroyed picture has been found, but
	 * a destroyed picture is still avalaible */
        free( p_destroyed_picture->p_data );        
        p_free_picture = p_destroyed_picture;        
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    }

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    /*
     * Prepare picture
     */
    if( p_free_picture != NULL )
    {
        /* Allocate memory */
        switch( i_type )
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        {
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        case YUV_420_PICTURE:                   /* YUV picture: bits per pixel */
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        case YUV_422_PICTURE:
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        case YUV_444_PICTURE:
            p_free_picture->p_data = malloc( 3 * i_height * i_bytes_per_line );                
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            p_free_picture->p_y = (yuv_data_t *) p_free_picture->p_data;
            p_free_picture->p_u = (yuv_data_t *)(p_free_picture->p_data + i_height * i_bytes_per_line);
            p_free_picture->p_v = (yuv_data_t *)(p_free_picture->p_data + i_height * i_bytes_per_line * 2);
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            break;                
#ifdef DEBUG
        default:
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            intf_DbgMsg("error: unknown picture type %d\n", i_type );
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            p_free_picture->p_data   =  NULL;            
            break;            
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#endif    
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        }

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        if( p_free_picture->p_data != NULL )
        {        
            /* Copy picture informations */
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            p_free_picture->i_type                      = i_type;
            p_free_picture->i_status                    = RESERVED_PICTURE;
            p_free_picture->i_width                     = i_width;
            p_free_picture->i_height                    = i_height;
            p_free_picture->i_bytes_per_line            = i_bytes_per_line;
            p_free_picture->i_refcount                  = 0;            
            p_free_picture->i_matrix_coefficients       = 1; 
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        }
        else
        {
            /* Memory allocation failed : set picture as empty */
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            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 ) );            
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        }
        
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#ifdef DEBUG_VIDEO
        intf_DbgMsg("picture %p (in free picture slot)\n", p_free_picture );        
#endif
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        vlc_mutex_unlock( &p_vout->lock );
        return( p_free_picture );
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    }
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    // No free or destroyed picture could be found
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    intf_DbgMsg( "warning: heap is full\n" );
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    vlc_mutex_unlock( &p_vout->lock );
    return( NULL );
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}

/*******************************************************************************
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 * vout_DestroyPicture: remove a permanent or reserved picture from the heap
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 *******************************************************************************
 * This function frees a previously reserved picture or a permanent
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 * 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 !
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 * This function does not need locking since reserved pictures are ignored by
 * the output thread.
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 *******************************************************************************/
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void vout_DestroyPicture( vout_thread_t *p_vout, picture_t *p_pic )
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{
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#ifdef DEBUG
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   /* Check if picture status is valid */
   if( p_pic->i_status != RESERVED_PICTURE )
   {
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       intf_DbgMsg("error: picture %d has invalid status %d\n", p_pic, p_pic->i_status );       
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   }   
#endif

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    p_pic->i_status = DESTROYED_PICTURE;
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#ifdef DEBUG_VIDEO
    intf_DbgMsg("picture %p\n", p_pic);    
#endif
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}

/*******************************************************************************
 * vout_LinkPicture: increment reference counter of a picture
 *******************************************************************************
 * This function increment the reference counter of a picture in the video
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 * heap. It needs a lock since several producer threads can access the picture.
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 *******************************************************************************/
void vout_LinkPicture( vout_thread_t *p_vout, picture_t *p_pic )
{
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    vlc_mutex_lock( &p_vout->lock );
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    p_pic->i_refcount++;
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    vlc_mutex_unlock( &p_vout->lock );
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#ifdef DEBUG_VIDEO
    intf_DbgMsg("picture %p\n", p_pic);    
#endif
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}

/*******************************************************************************
 * 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 )
{
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    vlc_mutex_lock( &p_vout->lock );
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    p_pic->i_refcount--;
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    if( (p_pic->i_refcount == 0) && (p_pic->i_status == DISPLAYED_PICTURE) )
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    {
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	p_pic->i_status = DESTROYED_PICTURE;
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    }
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    vlc_mutex_unlock( &p_vout->lock );
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#ifdef DEBUG_VIDEO
    intf_DbgMsg("picture %p\n", p_pic);    
#endif
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}

/* following functions are local */

/*******************************************************************************
 * 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 )
{
    int     i_index;                                          /* generic index */    

    /* Update status */
    *p_vout->pi_status = THREAD_START;    
    
    /* Initialize pictures */    
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    for( i_index = 0; i_index < VOUT_MAX_PICTURES; i_index++)
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    {
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        p_vout->p_picture[i_index].i_type  = EMPTY_PICTURE;
        p_vout->p_picture[i_index].i_status= FREE_PICTURE;
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    }

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

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    /* Allocate translation tables */
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    p_vout->p_trans_base = malloc( 4 * 1024 * p_vout->i_bytes_per_pixel );
    if( p_vout->p_trans_base == NULL )
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    {
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        intf_ErrMsg("error: %s\n", strerror(ENOMEM));
        return( 1 );                
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    }
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    p_vout->p_trans_red =   p_vout->p_trans_base +           384 *p_vout->i_bytes_per_pixel;
    p_vout->p_trans_green = p_vout->p_trans_base + (  1024 + 384)*p_vout->i_bytes_per_pixel;
    p_vout->p_trans_blue =  p_vout->p_trans_base + (2*1024 + 384)*p_vout->i_bytes_per_pixel;
    p_vout->p_trans_gray =  p_vout->p_trans_base + (3*1024 + 384)*p_vout->i_bytes_per_pixel;
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    /* Build translation tables */
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    BuildTables( p_vout );
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    /* Mark thread as running and return */
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    p_vout->b_active =          1;    
    *p_vout->pi_status =        THREAD_READY;    
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    intf_DbgMsg("thread ready\n");    
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    return( 0 );    
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}

/*******************************************************************************
 * 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)
{
    int             i_picture;                                /* picture index */
    int             i_err;                                       /* error code */
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    int             i_idle_level = 0;                            /* idle level */
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    mtime_t         current_date;                              /* current date */
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    mtime_t         pic_date = 0;                              /* picture date */    
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    mtime_t         last_date = 0;                        /* last picture date */    
    boolean_t       b_display;                                 /* display flag */    
    picture_t *     p_pic;                                  /* picture pointer */
     
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    /* 
     * Initialize thread and free configuration 
     */
    p_vout->b_error = InitThread( p_vout );
    if( p_vout->b_error )
    {
        free( p_vout );                                  /* destroy descriptor */
        return;        
    }    

    /*
     * Main loop - it is not executed if an error occured during
     * initialization
     */
    while( (!p_vout->b_die) && (!p_vout->b_error) )
    {
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        /* 
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	 * Find the picture to display - this operation does not need lock,
         * since only READY_PICTURES are handled 
         */
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        p_pic = NULL;         
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	for( i_picture = 0; i_picture < VOUT_MAX_PICTURES; i_picture++ )
	{
	    if( (p_vout->p_picture[i_picture].i_status == READY_PICTURE) &&
		( (p_pic == NULL) || 
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		  (p_vout->p_picture[i_picture].date < pic_date) ) )
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	    {
		p_pic = &p_vout->p_picture[i_picture];
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                pic_date = p_pic->date;                
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	    }
	}
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        current_date = mdate();
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        /* 
	 * Render picture if any
	 */
        if( p_pic )
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        {
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#ifdef STATS
            /* Computes FPS rate */
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            p_vout->fps_sample[ p_vout->c_fps_samples++ % VOUT_FPS_SAMPLES ] = pic_date;
#endif	    
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	    if( pic_date < current_date )
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	    {
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		/* Picture is late: it will be destroyed and the thread will sleep and
                 * go to next picture */
                vlc_mutex_lock( &p_vout->lock );
                p_pic->i_status = p_pic->i_refcount ? DISPLAYED_PICTURE : DESTROYED_PICTURE;
                vlc_mutex_unlock( &p_vout->lock );
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#ifdef DEBUG_VIDEO
		intf_DbgMsg( "warning: late picture %p skipped\n", p_pic );
#endif
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                p_pic =         NULL;                
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	    }
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	    else if( pic_date > current_date + VOUT_DISPLAY_DELAY )
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	    {
		/* A picture is ready to be rendered, but its rendering date is
		 * far from the current one so the thread will perform an empty loop
		 * as if no picture were found. The picture state is unchanged */
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                p_pic =         NULL;                
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	    }
	    else
	    {
		/* Picture has not yet been displayed, and has a valid display
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		 * date : render it, then mark it as displayed */
                if( p_vout->b_active )
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                {                    
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                    RenderPicture( p_vout, p_pic );
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                }                
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                vlc_mutex_lock( &p_vout->lock );
                p_pic->i_status = p_pic->i_refcount ? DISPLAYED_PICTURE : DESTROYED_PICTURE;
                vlc_mutex_unlock( &p_vout->lock );
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	    }
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        }
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        /* 
         * Rebuild tables if gamma has changed
         */
        if( p_vout->b_gamma_change )
        {
            p_vout->b_gamma_change = 0;            
            BuildTables( p_vout );            
        }        

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        /*
         * Check events, sleep and display picture
	 */
        i_err = vout_SysManage( p_vout );
	if( i_err < 0 )
	{
	    /* A fatal error occured, and the thread must terminate immediately,
	     * without displaying anything - setting b_error to 1 cause the
	     * immediate end of the main while() loop. */
	    p_vout->b_error = 1;
	}
	else 
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	{            
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	    if( p_pic )
	    {
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		/* A picture is ready to be displayed : remove blank screen flag */
                last_date =     pic_date;
                i_idle_level =  0;
                b_display =     1;                
                
                /* Render additionnal informations */
                if( p_vout->b_active && p_vout->b_info )
                {
                    RenderInfo( p_vout );    
                }                
                
                /* Sleep until its display date */
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		mwait( pic_date );
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	    }
	    else
	    {
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                /* If last picture was a long time ago, increase idle level, reset
                 * date and render idle screen */
                if( !i_err && (current_date - last_date > VOUT_IDLE_DELAY) )
                {       
                    last_date = current_date;                    
                    b_display = p_vout->b_active && RenderIdle( p_vout, i_idle_level++ );
                }
                else
                {
                    b_display = 0;                    
                }
                
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#ifdef STATS
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		/* Update counters */
		p_vout->c_idle_loops++;
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#endif
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		/* Sleep to wait for new pictures */
		msleep( VOUT_IDLE_SLEEP );
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	    }
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            /* On awakening, send immediately picture to display */
            if( b_display && p_vout->b_active )
            {
                vout_SysDisplay( p_vout );
            }
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	}
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#ifdef STATS
        /* Update counters */
        p_vout->c_loops++;
#endif
    } 

    /*
     * Error loop
     */
    if( p_vout->b_error )
    {
        ErrorThread( p_vout );        
    }

    /* End of thread */
    EndThread( p_vout );
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    intf_DbgMsg( "thread end\n" );
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}

/*******************************************************************************
 * ErrorThread: RunThread() error loop
 *******************************************************************************
 * This function is called when an error occured during thread main's loop. The
 * thread can still receive feed, but must be ready to terminate as soon as
 * possible.
 *******************************************************************************/
static void ErrorThread( vout_thread_t *p_vout )
{
    /* Wait until a `die' order */
    while( !p_vout->b_die )
    {
        /* Sleep a while */
        msleep( VOUT_IDLE_SLEEP );                
    }
}

/*******************************************************************************
 * EndThread: thread destruction
 *******************************************************************************
 * This function is called when the thread ends after a sucessfull 
 * initialization.
 *******************************************************************************/
static void EndThread( vout_thread_t *p_vout )
{
    int *   pi_status;                                        /* thread status */
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    int     i_picture;
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    /* Store status */
    pi_status = p_vout->pi_status;    
    *pi_status = THREAD_END;    

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    /* Destroy all remaining pictures */
    for( i_picture = 0; i_picture < VOUT_MAX_PICTURES; i_picture++ )
    {
	if( p_vout->p_picture[i_picture].i_status != FREE_PICTURE )
	{
            free( p_vout->p_picture[i_picture].p_data );
        }
    }
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    /* Destroy translation tables */
    free( p_vout->p_trans_base );
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    /* Destroy thread structures allocated by InitThread */
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    vout_SysEnd( p_vout );
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    vout_SysDestroy( p_vout );
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    free( p_vout );

    /* Update status */
    *pi_status = THREAD_OVER;    
}

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/*******************************************************************************
 * BuildTables: build YUV translation tables
 *******************************************************************************
 * This function will build translations tables according to pixel width and
 * gamma.
 *******************************************************************************/  
static void BuildTables( vout_thread_t *p_vout )
{
    u16 *       p_trans16_red =         (u16 *) p_vout->p_trans_red;
    u16 *       p_trans16_green =       (u16 *) p_vout->p_trans_green;
    u16 *       p_trans16_blue =        (u16 *) p_vout->p_trans_blue;
    u16 *       p_trans16_gray =        (u16 *) p_vout->p_trans_gray;
    u32 *       p_trans32_red =         (u32 *) p_vout->p_trans_red;
    u32 *       p_trans32_green =       (u32 *) p_vout->p_trans_green;
    u32 *       p_trans32_blue =        (u32 *) p_vout->p_trans_blue;
    u32 *       p_trans32_gray =        (u32 *) p_vout->p_trans_gray;          
    u8          i_gamma[256];                                   /* gamma table */    
    int         i_index;                                    /* index in tables */
    
    /* Build gamma table */     
    for( i_index = 0; i_index < 256; i_index++ )
    {
        i_gamma[i_index] = 255. * pow( (double)i_index / 255., p_vout->f_gamma );        
    }
        
    /* Build red, green, blue and gray tables */
    switch( p_vout->i_screen_depth )
    {
    case 15:
        for( i_index = -384; i_index < 640; i_index++) 
        {
            p_trans16_red[i_index]     = (i_gamma[CLIP_BYTE( i_index )] & 0xf8)<<7;
            p_trans16_green[i_index]   = (i_gamma[CLIP_BYTE( i_index )] & 0xf8)<<2;
            p_trans16_blue[i_index]    =  i_gamma[CLIP_BYTE( i_index )] >> 3;
            p_trans16_gray[i_index]    = p_trans16_red[i_index] | 
                p_trans16_green[i_index] | p_trans16_blue[i_index];            
        }
        break;        
    case 16:
        for( i_index = -384; i_index < 640; i_index++) 
        {
            p_trans16_red[i_index]     = (i_gamma[CLIP_BYTE( i_index )] & 0xf8)<<8;
            p_trans16_green[i_index]   = (i_gamma[CLIP_BYTE( i_index )] & 0xfc)<<3;
            p_trans16_blue[i_index]    =  i_gamma[CLIP_BYTE( i_index )] >> 3;
            p_trans16_gray[i_index]    = p_trans16_red[i_index] |
                p_trans16_green[i_index] | p_trans16_blue[i_index];
        }        
        break;        
    case 32:        
        for( i_index = -384; i_index < 640; i_index++) 
        {
            p_trans32_red[i_index]     = i_gamma[CLIP_BYTE( i_index )] <<16;
            p_trans32_green[i_index]   = i_gamma[CLIP_BYTE( i_index )] <<8;
            p_trans32_blue[i_index]    = i_gamma[CLIP_BYTE( i_index )] ;
            p_trans32_gray[i_index]    = p_trans32_red[i_index] |
                p_trans32_green[i_index] | p_trans32_blue[i_index];
        }
        break;        
#ifdef DEBUG
    default:
        intf_DbgMsg("error: invalid screen depth %d\n", p_vout->i_screen_depth );
        break;      
#endif
    } 
}

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/*******************************************************************************
 * RenderPicture: render a picture
 *******************************************************************************
 * This function convert a picture from a video heap to a pixel-encoded image
 * and copy it to the current rendering buffer. No lock is required, since the
 * rendered picture has been determined as existant, and will only be destroyed
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 * by the vout thread later.
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 * ???? 24 and 32 bpp should probably be separated
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 *******************************************************************************/
static void RenderPicture( vout_thread_t *p_vout, picture_t *p_pic )
{
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#ifdef DEBUG_VIDEO
    /* Send picture informations */
    intf_DbgMsg("picture %p\n", p_pic );

    /* Store rendering start date */
    p_vout->picture_render_time = mdate();    
#endif

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    switch( p_pic->i_type )
    {
    case YUV_420_PICTURE:                   /* YUV picture: YUV transformation */        
    case YUV_422_PICTURE:
    case YUV_444_PICTURE:
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        if( p_vout->b_grayscale )                                 /* grayscale */
        {
            RenderYUVGrayPicture( p_vout, p_pic );            
        }
        else if( p_vout->i_bytes_per_pixel == 2 )        /* color 15 or 16 bpp */
        {
            RenderYUV16Picture( p_vout, p_pic );        
        }
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        else if( p_vout->i_bytes_per_pixel == 4 )              /* color 32 bpp */
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        {
            RenderYUV32Picture( p_vout, p_pic );            
        }
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        break;        
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#ifdef DEBUG
    default:        
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        intf_DbgMsg("error: unknown picture type %d\n", p_pic->i_type );
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        break;        
#endif
    }
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#ifdef DEBUG_VIDEO
    /* Computes rendering time */
    p_vout->picture_render_time = mdate() - p_vout->picture_render_time;    
#endif
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}

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/*******************************************************************************
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 * RenderYUVGrayPicture: render YUV picture in grayscale
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 *******************************************************************************
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 * Performs the YUV convertion. The picture sent to this function should only
 * have YUV_420, YUV_422 or YUV_444 types.
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 *******************************************************************************/
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static void RenderYUVGrayPicture( vout_thread_t *p_vout, picture_t *p_pic )
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{
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    int         i_pic_x, i_pic_y;                /* x,y coordinates in picture */
    int         i_width, i_height;                             /* picture size */
    int         i_eol_offset;          /* pixels from end of line to next line */   
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    yuv_data_t *p_y;                                     /* Y data base adress */
941 942 943 944
    u16 *       p_pic16;                  /* destination picture, 15 or 16 bpp */
    u32 *       p_pic32;                        /* destination picture, 32 bpp */
    u16 *       p_trans16_gray;          /* transformation table, 15 or 16 bpp */
    u32 *       p_trans32_gray;                /* transformation table, 32 bpp */
945 946 947 948 949 950
 
    /* Set the base pointers and transformation parameters */
    p_y =               p_pic->p_y;
    i_width =           p_pic->i_width;
    i_height =          p_pic->i_height;
    i_eol_offset =      p_vout->i_bytes_per_line / p_vout->i_bytes_per_pixel - i_width;
951

952 953
    /* Get base adress for destination image and translation tables, then
     * transform image */
954 955 956 957
    switch( p_vout->i_screen_depth )
    {
    case 15:
    case 16:
958 959 960
        p_trans16_gray =       (u16 *) p_vout->p_trans_gray;
        p_pic16 =              (u16 *) vout_SysGetPicture( p_vout );
        YUV_GRAYSCALE( p_trans16_gray, p_pic16 );
961 962
        break;        
    case 32:
963 964 965
        p_trans32_gray =       (u32 *) p_vout->p_trans_gray;
        p_pic32 =              (u32 *) vout_SysGetPicture( p_vout );
        YUV_GRAYSCALE( p_trans32_gray, p_pic32 );
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        break;        
#ifdef DEBUG
    default:
        intf_DbgMsg("error: invalid screen depth %d\n", p_vout->i_screen_depth );
        break;    
#endif      
    }
}


/*******************************************************************************
 * RenderYUV16Picture: render a 15 or 16 bpp YUV picture
 *******************************************************************************
 * Performs the YUV convertion. The picture sent to this function should only
 * have YUV_420, YUV_422 or YUV_444 types.
 *******************************************************************************/
static void RenderYUV16Picture( vout_thread_t *p_vout, picture_t *p_pic )
{
    int         i_crv, i_cbu, i_cgu, i_cgv;     /* transformation coefficients */
    int         i_pic_x, i_pic_y;                /* x,y coordinates in picture */
    int         i_y, i_u, i_v;                           /* Y, U and V samples */
    int         i_width, i_height;                             /* picture size */
    int         i_chroma_width;                                /* chroma width */    
    int         i_eol_offset;          /* pixels from end of line to next line */
    yuv_data_t *p_y;                                     /* Y data base adress */
    yuv_data_t *p_u;                                     /* U data base adress */
    yuv_data_t *p_v;                                     /* V data base adress */
993 994 995 996
    u16 *       p_data;                 /* base adress for destination picture */
    u16 *       p_trans_red;                       /* red transformation table */
    u16 *       p_trans_green;                   /* green transformation table */
    u16 *       p_trans_blue;                     /* blue transformation table */
997 998 999 1000 1001 1002 1003
 
    /* Choose transformation matrix coefficients */
    i_crv = MATRIX_COEFFICIENTS_TABLE[p_pic->i_matrix_coefficients][0];
    i_cbu = MATRIX_COEFFICIENTS_TABLE[p_pic->i_matrix_coefficients][1];
    i_cgu = MATRIX_COEFFICIENTS_TABLE[p_pic->i_matrix_coefficients][2];
    i_cgv = MATRIX_COEFFICIENTS_TABLE[p_pic->i_matrix_coefficients][3];

1004 1005 1006 1007 1008
    /* Choose the conversions tables and picture address */
    p_trans_red =       (u16 *) p_vout->p_trans_red;
    p_trans_green =     (u16 *) p_vout->p_trans_green;
    p_trans_blue =      (u16 *) p_vout->p_trans_blue;    
    p_data =            (u16 *) vout_SysGetPicture( p_vout );
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026

    /* Set the base pointers and transformation parameters */
    p_y =               p_pic->p_y;
    p_u =               p_pic->p_u;
    p_v =               p_pic->p_v;
    i_width =           p_pic->i_width;
    i_height =          p_pic->i_height;
    i_chroma_width =    i_width / 2;
    i_eol_offset =      p_vout->i_bytes_per_line / 2 - i_width;    
        
    /* Do YUV transformation - the loops are repeated for optimization */
    switch( p_pic->i_type )
    {
    case YUV_420_PICTURE:                   /* 15 or 16 bpp 420 transformation */
#ifdef HAVE_MMX
        vout_YUV420_16_MMX( p_y, p_u, p_v, 
                            i_width, i_height, 
                            i_width, i_chroma_width,
1027
                            0, p_data, 
1028 1029 1030 1031
                            0, 0, p_vout->i_bytes_per_line, 
                            p_vout->i_screen_depth == 15 );
#else
        YUV_TRANSFORM( 420,
1032 1033 1034 1035
                       p_trans_red, 
                       p_trans_green, 
                       p_trans_blue,
                       p_data );            
1036 1037 1038 1039
#endif
        break;
    case YUV_422_PICTURE:                   /* 15 or 16 bpp 422 transformation */
        YUV_TRANSFORM( 422,
1040 1041 1042 1043
                       p_trans_red, 
                       p_trans_green, 
                       p_trans_blue,
                       p_data );            
1044
        break;
1045 1046
    case YUV_444_PICTURE:                   /* 15 or 16 bpp 444 transformation */
        YUV_TRANSFORM( 444,
1047 1048 1049 1050
                       p_trans_red, 
                       p_trans_green, 
                       p_trans_blue,
                       p_data );            
1051 1052 1053 1054 1055
        break;                 
    }
}

/*******************************************************************************
1056
 * RenderYUV32Picture: render a 32 bpp YUV picture
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071
 *******************************************************************************
 * Performs the YUV convertion. The picture sent to this function should only
 * have YUV_420, YUV_422 or YUV_444 types.
 *******************************************************************************/
static void RenderYUV32Picture( vout_thread_t *p_vout, picture_t *p_pic )
{
    int         i_crv, i_cbu, i_cgu, i_cgv;     /* transformation coefficients */
    int         i_pic_x, i_pic_y;                /* x,y coordinates in picture */
    int         i_y, i_u, i_v;                           /* Y, U and V samples */
    int         i_width, i_height;                             /* picture size */
    int         i_chroma_width;                                /* chroma width */    
    int         i_eol_offset;          /* pixels from end of line to next line */
    yuv_data_t *p_y;                                     /* Y data base adress */
    yuv_data_t *p_u;                                     /* U data base adress */
    yuv_data_t *p_v;                                     /* V data base adress */
1072 1073 1074 1075
    u32 *       p_data;                 /* base adress for destination picture */
    u32 *       p_trans_red;                       /* red transformation table */
    u32 *       p_trans_green;                   /* green transformation table */
    u32 *       p_trans_blue;                     /* blue transformation table */
1076 1077 1078 1079 1080 1081 1082
 
    /* Choose transformation matrix coefficients */
    i_crv = MATRIX_COEFFICIENTS_TABLE[p_pic->i_matrix_coefficients][0];
    i_cbu = MATRIX_COEFFICIENTS_TABLE[p_pic->i_matrix_coefficients][1];
    i_cgu = MATRIX_COEFFICIENTS_TABLE[p_pic->i_matrix_coefficients][2];
    i_cgv = MATRIX_COEFFICIENTS_TABLE[p_pic->i_matrix_coefficients][3];

1083 1084 1085 1086 1087
    /* Choose the conversions tables and picture address */
    p_trans_red =       (u32 *) p_vout->p_trans_red;
    p_trans_green =     (u32 *) p_vout->p_trans_green;
    p_trans_blue =      (u32 *) p_vout->p_trans_blue;    
    p_data =            (u32 *) vout_SysGetPicture( p_vout );
1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100

    /* Set the base pointers and transformation parameters */
    p_y =               p_pic->p_y;
    p_u =               p_pic->p_u;
    p_v =               p_pic->p_v;
    i_width =           p_pic->i_width;
    i_height =          p_pic->i_height;
    i_chroma_width =    i_width / 2;
    i_eol_offset =      p_vout->i_bytes_per_line / p_vout->i_bytes_per_pixel - i_width;
        
    /* Do YUV transformation - the loops are repeated for optimization */
    switch( p_pic->i_type )
    {
1101
    case YUV_420_PICTURE:                         /* 32 bpp 420 transformation */
1102
        YUV_TRANSFORM( 420,
1103 1104 1105 1106
                       p_trans_red, 
                       p_trans_green, 
                       p_trans_blue,
                       p_data );            
1107
        break;
1108
    case YUV_422_PICTURE:                         /* 32 bpp 422 transformation */
1109
        YUV_TRANSFORM( 422,
1110 1111 1112 1113
                       p_trans_red, 
                       p_trans_green, 
                       p_trans_blue,
                       p_data );            
1114
        break;
1115
    case YUV_444_PICTURE:                         /* 32 bpp 444 transformation */
1116
        YUV_TRANSFORM( 444,
1117 1118 1119 1120
                       p_trans_red, 
                       p_trans_green, 
                       p_trans_blue,
                       p_data );            
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
        break;                 
    }
}

/*******************************************************************************
 * RenderInfo: print additionnal informations on a picture
 *******************************************************************************
 * This function will add informations such as fps and buffer size on a picture
 *******************************************************************************/
static void RenderInfo( vout_thread_t *p_vout )
{
    char        psz_buffer[256];                              /* string buffer */
1133 1134 1135 1136 1137
#ifdef DEBUG
    int         i_ready_pic = 0;                             /* ready pictures */
    int         i_reserved_pic = 0;                       /* reserved pictures */
    int         i_picture;                                    /* picture index */
#endif
1138 1139

#ifdef STATS
1140 1141
    /* Print FPS rate in upper right corner */
    if( p_vout->c_fps_samples > VOUT_FPS_SAMPLES )
1142 1143
    {        
        sprintf( psz_buffer, "%.2f fps", (double) VOUT_FPS_SAMPLES * 1000000 /
1144 1145
                 ( p_vout->fps_sample[ (p_vout->c_fps_samples - 1) % VOUT_FPS_SAMPLES ] -
                   p_vout->fps_sample[ p_vout->c_fps_samples % VOUT_FPS_SAMPLES ] ) );        
1146 1147 1148
        vout_SysPrint( p_vout, p_vout->i_width, 0, 1, -1, psz_buffer );
    }

1149
    /* Print statistics in upper left corner */
1150 1151
    sprintf( psz_buffer, "gamma=%.2f   %ld frames (%.1f %% idle)", 
             p_vout->f_gamma, p_vout->c_fps_samples, p_vout->c_loops ? 
1152
             (double ) p_vout->c_idle_loops * 100 / p_vout->c_loops : 100. );    
1153 1154 1155
    vout_SysPrint( p_vout, 0, 0, -1, -1, psz_buffer );    
#endif
    
1156
#ifdef DEBUG
1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171
    /* Print heap state in lower left corner  */
    for( i_picture = 0; i_picture < VOUT_MAX_PICTURES; i_picture++ )
    {
        switch( p_vout->p_picture[i_picture].i_status )
        {
        case RESERVED_PICTURE:
            i_reserved_pic++;            
            break;            
        case READY_PICTURE:
            i_ready_pic++;            
            break;            
        }        
    }
    sprintf( psz_buffer, "video heap: %d/%d/%d", i_reserved_pic, i_ready_pic, 
             VOUT_MAX_PICTURES );
1172 1173 1174 1175
    vout_SysPrint( p_vout, 0, p_vout->i_height, -1, 1, psz_buffer );    
#endif

#ifdef DEBUG_VIDEO
1176
    /* Print rendering statistics in lower right corner */
1177 1178 1179
    sprintf( psz_buffer, "picture rendering time: %lu us", 
             (unsigned long) p_vout->picture_render_time );    
    vout_SysPrint( p_vout, p_vout->i_width, p_vout->i_height, 1, 1, psz_buffer );    
1180
#endif
1181 1182
}

1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219
/*******************************************************************************
 * RenderIdle: render idle picture
 *******************************************************************************
 * This function will clear the display or print a logo. Level will vary from 0
 * to a very high value that noone should never reach. It returns non 0 if 
 * something needs to be displayed and 0 if the previous picture can be kept.
 *******************************************************************************/
static int RenderIdle( vout_thread_t *p_vout, int i_level )
{
    byte_t      *pi_pic;                            /* pointer to picture data */
    
    /* Get frame pointer and clear display */
    pi_pic = vout_SysGetPicture( p_vout );    
     
    
    switch( i_level )
    {
    case 0:                                           /* level 0: clear screen */
        memset( pi_pic, 0, p_vout->i_bytes_per_line * p_vout->i_height );
        break;                
    case 1:                                            /* level 1: "no stream" */        
        memset( pi_pic, 0, p_vout->i_bytes_per_line * p_vout->i_height );
        vout_SysPrint( p_vout, p_vout->i_width / 2, p_vout->i_height / 2,
                       0, 0, "no stream" );     
        break;
    case 50:                                    /* level 50: copyright message */
        memset( pi_pic, 0, p_vout->i_bytes_per_line * p_vout->i_height );
        vout_SysPrint( p_vout, p_vout->i_width / 2, p_vout->i_height / 2,
                       0, 0, COPYRIGHT_MESSAGE );        
        break; 
    default:                            /* other levels: keep previous picture */
        return( 0 );
        break;        
    }

    return( 1 );    
}
1220