/*****************************************************************************
 * video_parser.c : video parser thread
 *****************************************************************************
 * Copyright (C) 1999, 2000 VideoLAN
 *
 * Authors: Christophe Massiot <massiot@via.ecp.fr>
 *          Samuel Hocevar <sam@via.ecp.fr>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/* FIXME: passer en terminate/destroy avec les signaux supplémentaires ?? */

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include "defs.h"

#include <stdlib.h>                                      /* malloc(), free() */
#include <unistd.h>                                              /* getpid() */
#include <sys/types.h>                        /* on BSD, uio.h needs types.h */
#include <sys/uio.h>                                            /* "input.h" */
#include <errno.h>
#include <string.h>

#include "config.h"
#include "common.h"
#include "threads.h"
#include "mtime.h"
#include "plugins.h"

#include "intf_msg.h"
#include "debug.h"                 /* XXX?? temporaire, requis par netlist.h */

#include "input.h"
#include "input_netlist.h"
#include "decoder_fifo.h"
#include "video.h"
#include "video_output.h"

#include "vdec_idct.h"
#include "video_decoder.h"
#include "vdec_motion.h"

#include "vpar_blocks.h"
#include "vpar_headers.h"
#include "vpar_synchro.h"
#include "video_parser.h"
#include "video_fifo.h"

/*
 * Local prototypes
 */
//static int      CheckConfiguration  ( video_cfg_t *p_cfg );
static int      InitThread          ( vpar_thread_t *p_vpar );
static void     RunThread           ( vpar_thread_t *p_vpar );
static void     ErrorThread         ( vpar_thread_t *p_vpar );
static void     EndThread           ( vpar_thread_t *p_vpar );

/*****************************************************************************
 * vpar_CreateThread: create a generic parser thread
 *****************************************************************************
 * This function creates a new video parser thread, and returns a pointer
 * to its description. On error, it returns NULL.
 * Following configuration properties are used:
 * XXX??
 *****************************************************************************/
#include "main.h"
#include "interface.h"
extern main_t *     p_main;

vpar_thread_t * vpar_CreateThread( /* video_cfg_t *p_cfg, */ input_thread_t *p_input /*,
                                   vout_thread_t *p_vout, int *pi_status */ )
{
    vpar_thread_t *     p_vpar;

    intf_DbgMsg( "vpar debug: creating video parser thread\n" );

    /* Allocate the memory needed to store the thread's structure */
    if ( (p_vpar = (vpar_thread_t *)malloc( sizeof(vpar_thread_t) )) == NULL )
    {
        intf_ErrMsg( "vpar error: not enough memory "
                     "for vpar_CreateThread() to create the new thread\n");
        return( NULL );
    }

    /*
     * Initialize the thread properties
     */
    p_vpar->b_die = 0;
    p_vpar->b_error = 0;

    /*
     * Initialize the input properties
     */
    /* Initialize the decoder fifo's data lock and conditional variable
     * and set its buffer as empty */
    vlc_mutex_init( &p_vpar->fifo.data_lock );
    vlc_cond_init( &p_vpar->fifo.data_wait );
    p_vpar->fifo.i_start = 0;
    p_vpar->fifo.i_end = 0;
    /* Initialize the bit stream structure */
    p_vpar->bit_stream.p_input = p_input;
    p_vpar->bit_stream.p_decoder_fifo = &p_vpar->fifo;
    p_vpar->bit_stream.fifo.buffer = 0;
    p_vpar->bit_stream.fifo.i_available = 0;

    /* FIXME !!!!?? */
    p_vpar->p_vout = p_main->p_intf->p_vout;

    /* Spawn the video parser thread */
    if ( vlc_thread_create( &p_vpar->thread_id, "video parser",
                            (vlc_thread_func_t)RunThread, (void *)p_vpar ) )
    {
        intf_ErrMsg("vpar error: can't spawn video parser thread\n");
        free( p_vpar );
        return( NULL );
    }

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

/*****************************************************************************
 * vpar_DestroyThread: destroy a generic parser thread
 *****************************************************************************
 * Destroy a terminated thread. This function will return 0 if the thread could
 * be destroyed, and non 0 else. The last case probably means that the thread
 * was still active, and another try may succeed.
 *****************************************************************************/
void vpar_DestroyThread( vpar_thread_t *p_vpar /*, int *pi_status */ )
{
    intf_DbgMsg( "vpar debug: requesting termination of "
                 "video parser thread %p\n", p_vpar);

    /* Ask thread to kill itself */
    p_vpar->b_die = 1;
    /* Make sure the parser thread leaves the GetByte() function */
    vlc_mutex_lock( &(p_vpar->fifo.data_lock) );
    vlc_cond_signal( &(p_vpar->fifo.data_wait) );
    vlc_mutex_unlock( &(p_vpar->fifo.data_lock) );

    /* Waiting for the parser thread to exit */
    /* Remove this as soon as the "status" flag is implemented */
    vlc_thread_join( p_vpar->thread_id );
}

/* following functions are local */

/*****************************************************************************
 * CheckConfiguration: check vpar_CreateThread() configuration
 *****************************************************************************
 * Set default parameters where required. In DEBUG mode, check if configuration
 * is valid.
 *****************************************************************************/
#if 0
static int CheckConfiguration( video_cfg_t *p_cfg )
{
    /* XXX?? */

    return( 0 );
}
#endif

/*****************************************************************************
 * InitThread: initialize vpar 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( vpar_thread_t *p_vpar )
{
#ifdef VDEC_SMP
    int i_dummy;
#endif

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

    /* Our first job is to initialize the bit stream structure with the
     * beginning of the input stream */
    vlc_mutex_lock( &p_vpar->fifo.data_lock );
    while ( DECODER_FIFO_ISEMPTY(p_vpar->fifo) )
    {
        if ( p_vpar->b_die )
        {
            vlc_mutex_unlock( &p_vpar->fifo.data_lock );
            return( 1 );
        }
        vlc_cond_wait( &p_vpar->fifo.data_wait, &p_vpar->fifo.data_lock );
    }
    p_vpar->bit_stream.p_ts = DECODER_FIFO_START( p_vpar->fifo )->p_first_ts;
    p_vpar->bit_stream.p_byte = p_vpar->bit_stream.p_ts->buffer
                                + p_vpar->bit_stream.p_ts->i_payload_start;
    p_vpar->bit_stream.p_end = p_vpar->bit_stream.p_ts->buffer
                               + p_vpar->bit_stream.p_ts->i_payload_end;
    vlc_mutex_unlock( &p_vpar->fifo.data_lock );

    /* Initialize parsing data */
    p_vpar->sequence.p_forward = NULL;
    p_vpar->sequence.p_backward = NULL;
    p_vpar->sequence.intra_quant.b_allocated = 0;
    p_vpar->sequence.nonintra_quant.b_allocated = 0;
    p_vpar->sequence.chroma_intra_quant.b_allocated = 0;
    p_vpar->sequence.chroma_nonintra_quant.b_allocated = 0;

    /* Initialize copyright information */
    p_vpar->sequence.b_copyright_flag = 0;
    p_vpar->sequence.b_original = 0;
    p_vpar->sequence.i_copyright_id = 0;
    p_vpar->sequence.i_copyright_nb = 0;

    p_vpar->picture.p_picture = NULL;
    p_vpar->picture.i_current_structure = 0;

    /* Initialize other properties */
#ifdef STATS
    p_vpar->c_loops = 0;
    p_vpar->c_idle_loops = 0;
    p_vpar->c_pictures = 0;
    p_vpar->c_i_pictures = 0;
    p_vpar->c_p_pictures = 0;
    p_vpar->c_b_pictures = 0;
    p_vpar->c_decoded_pictures = 0;
    p_vpar->c_decoded_i_pictures = 0;
    p_vpar->c_decoded_p_pictures = 0;
    p_vpar->c_decoded_b_pictures = 0;
#endif

    /* Initialize video FIFO */
    vpar_InitFIFO( p_vpar );

    memset( p_vpar->pp_vdec, 0, NB_VDEC*sizeof(vdec_thread_t *) );

#ifdef VDEC_SMP
    /* 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;

    /* Re-nice ourself */
    if( nice(VDEC_NICE) == -1 )
    {
        intf_WarnMsg( 2, "vpar warning : couldn't nice() (%s)\n",
                      strerror(errno) );
    }
#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
     */
    vpar_SynchroInit( p_vpar );

    /* 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);
}