video_parser.c

vlc stand 0.1.99 ist sehr einfach

    /* Spawn video_decoder threads */
    /* FIXME: modify the number of vdecs at runtime ?? */
    for( i_dummy = 0; i_dummy < NB_VDEC; i_dummy++ )
    {
        if( (p_vpar->pp_vdec[i_dummy] = vdec_CreateThread( p_vpar )) == NULL )
        {
            return( 1 );
        }
    }
#else
    /* Fake a video_decoder thread */
    if( (p_vpar->pp_vdec[0] = (vdec_thread_t *)malloc(sizeof( vdec_thread_t ))) == NULL
        || vdec_InitThread( p_vpar->pp_vdec[0] ) )
    {
        return( 1 );
    }
    p_vpar->pp_vdec[0]->b_die = 0;
    p_vpar->pp_vdec[0]->b_error = 0;
    p_vpar->pp_vdec[0]->p_vpar = p_vpar;
#endif

    /* Initialize lookup tables */
#if defined(MPEG2_COMPLIANT) && !defined(VDEC_DFT)
    vpar_InitCrop( p_vpar );
#endif
    vpar_InitMbAddrInc( p_vpar );
    vpar_InitDCTTables( p_vpar );
    vpar_InitPMBType( p_vpar );
    vpar_InitBMBType( p_vpar );
    vpar_InitDCTTables( p_vpar );


    /*
     * Initialize the synchro properties
     */
#ifdef SAM_SYNCHRO
    p_vpar->synchro.i_last_decode_pts = 0;
    p_vpar->synchro.i_last_display_pts = 0;
    p_vpar->synchro.i_images_since_pts = 0;
    /* for i frames */
    p_vpar->synchro.i_last_i_pts = 0;
    p_vpar->synchro.theorical_fps = 25;
    p_vpar->synchro.i_last_nondropped_i_pts = 0;
    p_vpar->synchro.actual_fps = 20;
    /* the fifo */
    p_vpar->synchro.i_fifo_start = 0;
    p_vpar->synchro.i_fifo_stop = 0;
    /* the counter */
    p_vpar->synchro.modulo = 0;
    /* mean decoding time - at least 200 ms for a slow machine */
    p_vpar->synchro.i_mean_decode_time = 200000;
    /* assume we can display all Is and 2 Ps */
    p_vpar->synchro.can_display_i = 1;
    p_vpar->synchro.can_display_p = 0;
    p_vpar->synchro.displayable_p = 2;
    p_vpar->synchro.can_display_b = 0;
    p_vpar->synchro.displayable_b = 0;
    /* assume there were about 3 P and 6 B images between I's */
    p_vpar->synchro.current_p_count = 1;
    p_vpar->synchro.nondropped_p_count = 1;
    p_vpar->synchro.p_count_predict = 3;
    p_vpar->synchro.current_b_count = 1;
    p_vpar->synchro.nondropped_b_count = 1;
    p_vpar->synchro.b_count_predict = 6;
    for( i_dummy = 0; i_dummy < 6; i_dummy++)
    {
        p_vpar->synchro.tab_p[i_dummy].mean = 3;
        p_vpar->synchro.tab_p[i_dummy].deviation = .5;
        p_vpar->synchro.tab_b[i_dummy].mean = 6;
        p_vpar->synchro.tab_b[i_dummy].deviation = .5;
    }
#endif

#ifdef MEUUH_SYNCHRO
    p_vpar->synchro.kludge_level = 5;
    p_vpar->synchro.kludge_nbp = p_vpar->synchro.kludge_p = 5;
    p_vpar->synchro.kludge_nbb = p_vpar->synchro.kludge_b = 6;
    p_vpar->synchro.kludge_b = 0;
    p_vpar->synchro.kludge_prevdate = 0;
#endif

#ifdef POLUX_SYNCHRO
    p_vpar->synchro.i_current_frame_date = 0;
    p_vpar->synchro.i_backward_frame_date = 0;

    p_vpar->synchro.r_p_average = p_vpar->synchro.i_p_nb = 6;
    p_vpar->synchro.r_b_average = p_vpar->synchro.i_b_nb = 6;
    p_vpar->synchro.i_p_count = 0;
    p_vpar->synchro.i_b_count = 0;
    p_vpar->synchro.i_i_count = 0;
#endif

    /* Mark thread as running and return */
    intf_DbgMsg("vpar debug: InitThread(%p) succeeded\n", p_vpar);
    return( 0 );
}

/*****************************************************************************
 * RunThread: generic parser thread
 *****************************************************************************
 * Video parser thread. This function only returns when the thread is
 * terminated.
 *****************************************************************************/
static void RunThread( vpar_thread_t *p_vpar )
{
    intf_DbgMsg("vpar debug: running video parser thread (%p) (pid == %i)\n", p_vpar, getpid());

    /*
     * Initialize thread
     */
    p_vpar->b_error = InitThread( p_vpar );

    p_vpar->b_run = 1;

    /*
     * Main loop - it is not executed if an error occured during
     * initialization
     */
    while( (!p_vpar->b_die) && (!p_vpar->b_error) )
    {
        /* Find the next sequence header in the stream */
        p_vpar->b_error = vpar_NextSequenceHeader( p_vpar );

#ifdef STATS
        p_vpar->c_sequences++;
#endif

        while( (!p_vpar->b_die) && (!p_vpar->b_error) )
        {
            /* Parse the next sequence, group or picture header */
            if( vpar_ParseHeader( p_vpar ) )
            {
                /* End of sequence */
                break;
            };
        }
    }

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

    p_vpar->b_run = 0;

    /* End of thread */
    EndThread( p_vpar );
}

/*****************************************************************************
 * 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( vpar_thread_t *p_vpar )
{
    /* We take the lock, because we are going to read/write the start/end
     * indexes of the decoder fifo */
    vlc_mutex_lock( &p_vpar->fifo.data_lock );

    /* Wait until a `die' order is sent */
    while( !p_vpar->b_die )
    {
        /* Trash all received PES packets */
        while( !DECODER_FIFO_ISEMPTY(p_vpar->fifo) )
        {
            input_NetlistFreePES( p_vpar->bit_stream.p_input, DECODER_FIFO_START(p_vpar->fifo) );
            DECODER_FIFO_INCSTART( p_vpar->fifo );
        }

        /* Waiting for the input thread to put new PES packets in the fifo */
        vlc_cond_wait( &p_vpar->fifo.data_wait, &p_vpar->fifo.data_lock );
    }

    /* We can release the lock before leaving */
    vlc_mutex_unlock( &p_vpar->fifo.data_lock );
}

/*****************************************************************************
 * EndThread: thread destruction
 *****************************************************************************
 * This function is called when the thread ends after a sucessful
 * initialization.
 *****************************************************************************/
static void EndThread( vpar_thread_t *p_vpar )
{
#ifdef VDEC_SMP
    int i_dummy;
#endif

    intf_DbgMsg("vpar debug: destroying video parser thread %p\n", p_vpar);

#ifdef DEBUG
    /* Check for remaining PES packets */
    /* XXX?? */
#endif

    /* Destroy thread structures allocated by InitThread */
//    vout_DestroyStream( p_vpar->p_vout, p_vpar->i_stream );
    /* XXX?? */

    /* Dispose of matrices if they have been allocated. */
    if( p_vpar->sequence.intra_quant.b_allocated )
    {
        free( p_vpar->sequence.intra_quant.pi_matrix );
    }
    if( p_vpar->sequence.nonintra_quant.b_allocated )
    {
        free( p_vpar->sequence.nonintra_quant.pi_matrix) ;
    }
    if( p_vpar->sequence.chroma_intra_quant.b_allocated )
    {
        free( p_vpar->sequence.chroma_intra_quant.pi_matrix );
    }
    if( p_vpar->sequence.chroma_nonintra_quant.b_allocated )
    {
        free( p_vpar->sequence.chroma_nonintra_quant.pi_matrix );
    }

#ifdef VDEC_SMP
    /* Destroy vdec threads */
    for( i_dummy = 0; i_dummy < NB_VDEC; i_dummy++ )
    {
        if( p_vpar->pp_vdec[i_dummy] != NULL )
            vdec_DestroyThread( p_vpar->pp_vdec[i_dummy] );
        else
            break;
    }
#else
    free( p_vpar->pp_vdec[0] );
#endif

    free( p_vpar );

    intf_DbgMsg("vpar debug: EndThread(%p)\n", p_vpar);
}