git.sesse.net Git - vlc/blob - src/video_parser/video_fifo.c

   1 /*******************************************************************************
   2  * video_fifo.c : video FIFO management
   3  * (c)1999 VideoLAN
   4  *******************************************************************************/
   5
   6 /*******************************************************************************
   7  * Preamble
   8  *******************************************************************************/
   9 #include <errno.h>
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <unistd.h>
  13 #include <string.h>
  14 #include <sys/uio.h>
  15 #include <X11/Xlib.h>
  16 #include <X11/extensions/XShm.h>
  17
  18 #include "config.h"
  19 #include "common.h"
  20 #include "mtime.h"
  21 #include "vlc_thread.h"
  22
  23 #include "intf_msg.h"
  24 #include "debug.h"                      /* ?? temporaire, requis par netlist.h */
  25
  26 #include "input.h"
  27 #include "input_netlist.h"
  28 #include "decoder_fifo.h"
  29 #include "video.h"
  30 #include "video_output.h"
  31
  32 #include "vdec_idct.h"
  33 #include "video_decoder.h"
  34 #include "vdec_motion.h"
  35
  36 #include "vpar_blocks.h"
  37 #include "vpar_headers.h"
  38 #include "video_fifo.h"
  39 #include "vpar_synchro.h"
  40 #include "video_parser.h"
  41
  42 /*****************************************************************************
  43  * vpar_InitFIFO : initialize the video FIFO
  44  *****************************************************************************/
  45 void vpar_InitFIFO( vpar_thread_t * p_vpar )
  46 {
  47     int                 i_dummy;
  48
  49     /* Initialize mutex and cond */
  50     vlc_mutex_init( &p_vpar->vfifo.lock );
  51     vlc_cond_init( &p_vpar->vfifo.wait );
  52     vlc_mutex_init( &p_vpar->vbuffer.lock );
  53
  54     /* Initialize FIFO properties */
  55     p_vpar->vfifo.i_start = p_vpar->vfifo.i_end = 0;
  56     p_vpar->vfifo.p_vpar = p_vpar;
  57
  58     /* Initialize buffer properties */
  59     p_vpar->vbuffer.i_index = VFIFO_SIZE; /* all structures are available */
  60     for( i_dummy = 0; i_dummy < VFIFO_SIZE + 1; i_dummy++ )
  61     {
  62         p_vpar->vbuffer.pp_mb_free[i_dummy] = p_vpar->vbuffer.p_macroblocks
  63                                                + i_dummy;
  64     }
  65 }
  66
  67 /*****************************************************************************
  68  * vpar_GetMacroblock : return a macroblock to be decoded
  69  *****************************************************************************/
  70 macroblock_t * vpar_GetMacroblock( video_fifo_t * p_fifo )
  71 {
  72     macroblock_t *      p_mb;
  73
  74     vlc_mutex_lock( &p_fifo->lock );
  75     while( VIDEO_FIFO_ISEMPTY( *p_fifo ) )
  76     {
  77         vlc_cond_wait( &p_fifo->wait, &p_fifo->lock );
  78         if( p_fifo->p_vpar->b_die )
  79         {
  80             vlc_mutex_unlock( &p_fifo->lock );
  81             return( NULL );
  82         }
  83     }
  84
  85     p_mb = VIDEO_FIFO_START( *p_fifo );
  86     VIDEO_FIFO_INCSTART( *p_fifo );
  87
  88     vlc_mutex_unlock( &p_fifo->lock );
  89
  90     return( p_mb );
  91 }
  92
  93 /*****************************************************************************
  94  * vpar_NewMacroblock : return a buffer for the parser
  95  *****************************************************************************/
  96 macroblock_t * vpar_NewMacroblock( video_fifo_t * p_fifo )
  97 {
  98     macroblock_t *      p_mb;
  99
 100 #define P_buffer p_fifo->p_vpar->vbuffer
 101     vlc_mutex_lock( &P_buffer.lock );
 102     if( P_buffer.i_index == -1 )
 103     {
 104         /* No more structures available. This should not happen ! */
 105         return NULL;
 106     }
 107
 108     p_mb = P_buffer.pp_mb_free[ P_buffer.i_index-- ];
 109
 110     vlc_mutex_unlock( &P_buffer.lock );
 111 #undef P_buffer
 112     return( p_mb );
 113 }
 114
 115 /*****************************************************************************
 116  * vpar_DecodeMacroblock : put a macroblock in the video fifo
 117  *****************************************************************************/
 118 void vpar_DecodeMacroblock( video_fifo_t * p_fifo, macroblock_t * p_mb )
 119 {
 120     /* Place picture in the video FIFO */
 121     vlc_mutex_lock( &p_fifo->lock );
 122
 123     /* By construction, the video FIFO cannot be full */
 124     VIDEO_FIFO_END( *p_fifo ) = p_mb;
 125     VIDEO_FIFO_INCEND( *p_fifo );
 126
 127     vlc_mutex_unlock( &p_fifo->lock );
 128 }
 129
 130 /*****************************************************************************
 131  * vpar_ReleaseMacroblock : release a macroblock and put the picture in the
 132  *                          video output heap, if it is finished
 133  *****************************************************************************/
 134 void vpar_ReleaseMacroblock( video_fifo_t * p_fifo, macroblock_t * p_mb )
 135 {
 136     /* Unlink picture buffer */
 137     vlc_mutex_lock( &p_mb->p_picture->lock_deccount );
 138     p_mb->p_picture->i_deccount--;
 139
 140     /* Test if it was the last block of the picture */
 141     if( p_mb->p_picture->i_deccount == 0 )
 142     {
 143         /* Mark the picture to be displayed */
 144         vout_DisplayPicture( p_fifo->p_vpar->p_vout, p_mb->p_picture );
 145
 146         /* Warn Synchro for its records. */
 147         vpar_SynchroEnd( p_fifo->p_vpar );
 148
 149         /* Unlink referenced pictures */
 150         if( p_mb->p_forward != NULL )
 151         {
 152                 vout_UnlinkPicture( p_fifo->p_vpar->p_vout, p_mb->p_forward );
 153         }
 154         if( p_mb->p_backward != NULL )
 155         {
 156             vout_UnlinkPicture( p_fifo->p_vpar->p_vout, p_mb->p_backward );
 157         }
 158    }
 159     vlc_mutex_unlock( & p_mb->p_picture->lock_deccount );
 160
 161     /* Release the macroblock_t structure */
 162 #define P_buffer p_fifo->p_vpar->vbuffer
 163     vlc_mutex_lock( &P_buffer.lock );
 164     P_buffer.pp_mb_free[ ++P_buffer.i_index ] = p_mb;
 165     vlc_mutex_unlock( &P_buffer.lock );
 166 #undef P_buffer
 167 }
 168
 169 /*****************************************************************************
 170  * vpar_DestroyMacroblock : destroy a macroblock in case of error
 171  *****************************************************************************/
 172 void vpar_DestroyMacroblock( video_fifo_t * p_fifo, macroblock_t * p_mb )
 173 {
 174     /* Release the macroblock_t structure */
 175 #define P_buffer p_fifo->p_vpar->vbuffer
 176     vlc_mutex_lock( &P_buffer.lock );
 177     P_buffer.pp_mb_free[ ++P_buffer.i_index ] = p_mb;
 178     vlc_mutex_unlock( &P_buffer.lock );
 179 #undef P_buffer
 180 }