input.c 16.1 KB
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/*****************************************************************************
 * input.c: input thread
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 * Read an MPEG2 stream, demultiplex and parse it before sending it to
 * decoders.
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 *****************************************************************************
 * Copyright (C) 1998, 1999, 2000 VideoLAN
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 * $Id: input.c,v 1.88 2001/03/02 03:32:46 stef Exp $
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 *
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 * Authors: Christophe Massiot <massiot@via.ecp.fr>
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 *
 * 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.
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 * 
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 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
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 *
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 * 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.
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 *****************************************************************************/
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/*****************************************************************************
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 * Preamble
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 *****************************************************************************/
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#include "defs.h"

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#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
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#ifdef STATS
#   include <sys/times.h>
#endif

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#include "config.h"
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#include "common.h"
#include "threads.h"
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#include "mtime.h"
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#include "modules.h"
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#include "intf_msg.h"
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#include "intf_plst.h"
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#include "stream_control.h"
#include "input_ext-intf.h"
#include "input_ext-dec.h"
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#include "input.h"
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#include "interface.h"

#include "main.h"
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/*****************************************************************************
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 * Local prototypes
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 *****************************************************************************/
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static void RunThread       ( input_thread_t *p_input );
static  int InitThread      ( input_thread_t *p_input );
static void ErrorThread     ( input_thread_t *p_input );
static void DestroyThread   ( input_thread_t *p_input );
static void EndThread       ( input_thread_t *p_input );
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/*****************************************************************************
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 * input_CreateThread: creates a new input thread
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 *****************************************************************************
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 * This function creates a new input, 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.
 * If not, it will be updated using one of the THREAD_* constants.
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 *****************************************************************************/
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input_thread_t *input_CreateThread ( playlist_item_t *p_item, int *pi_status )
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{
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    input_thread_t *    p_input;                        /* thread descriptor */
    int                 i_status;                           /* thread status */

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    /* Allocate descriptor */
    p_input = (input_thread_t *)malloc( sizeof(input_thread_t) );
    if( p_input == NULL )
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    {
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        intf_ErrMsg( "input error: can't allocate input thread (%s)",
                     strerror(errno) );
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        return( NULL );
    }
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    /* Packets read once */
    p_input->i_read_once = INPUT_READ_ONCE;

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    /* Initialize thread properties */
    p_input->b_die              = 0;
    p_input->b_error            = 0;
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    p_input->b_eof              = 0;

    /* Set target */
    p_input->p_source           = p_item->psz_name;

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    /* I have never understood that stuff --Meuuh */
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    p_input->pi_status          = (pi_status != NULL) ? pi_status : &i_status;
    *p_input->pi_status         = THREAD_CREATE;
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    /* Initialize stream description */
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    p_input->stream.i_es_number = 0;
    p_input->stream.i_selected_es_number = 0;
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    p_input->stream.i_pgrm_number = 0;
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    p_input->stream.i_new_status = p_input->stream.i_new_rate = 0;
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    p_input->stream.i_mux_rate = 0;
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    p_input->stream.i_area_nb = 0;
    p_input->stream.pp_areas = NULL;
    /* By default there is one areas in a stream */
    input_AddArea( p_input );
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    p_input->stream.p_selected_area = p_input->stream.pp_areas[0];
    p_input->stream.p_selected_area->i_seek = NO_SEEK;
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    /* Initialize stream control properties. */
    p_input->stream.control.i_status = PLAYING_S;
    p_input->stream.control.i_rate = DEFAULT_RATE;
    p_input->stream.control.b_mute = 0;
    p_input->stream.control.b_bw = 0;
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    /* Initialize default settings for spawned decoders */
    p_input->p_default_aout = p_main->p_aout;
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    p_input->p_default_vout = p_main->p_vout;
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    /* Create thread and set locks. */
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    vlc_mutex_init( &p_input->stream.stream_lock );
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    vlc_cond_init( &p_input->stream.stream_wait );
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    vlc_mutex_init( &p_input->stream.control.control_lock );
    if( vlc_thread_create( &p_input->thread_id, "input", (void *) RunThread,
                           (void *) p_input ) )
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    {
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        intf_ErrMsg( "input error: can't create input thread (%s)",
                     strerror(errno) );
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        free( p_input );
        return( NULL );
    }
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    /* If status is NULL, wait until the thread is created */
    if( pi_status == NULL )
    {
        do
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        {
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            msleep( THREAD_SLEEP );
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        } while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
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                && (i_status != THREAD_FATAL) );
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        if( i_status != THREAD_READY )
        {
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            return( NULL );
        }
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    }
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    return( p_input );
}

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/*****************************************************************************
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 * input_DestroyThread: mark an input thread as zombie
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 *****************************************************************************
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 * This function should not return until the thread is effectively cancelled.
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 *****************************************************************************/
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void input_DestroyThread( input_thread_t *p_input, int *pi_status )
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{
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    int         i_status;                                   /* thread status */
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    /* Set status */
    p_input->pi_status = (pi_status != NULL) ? pi_status : &i_status;
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    *p_input->pi_status = THREAD_DESTROY;

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    /* Request thread destruction */
    p_input->b_die = 1;
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    /* Make the thread exit of an eventual vlc_cond_wait() */
    vlc_mutex_lock( &p_input->stream.stream_lock );
    vlc_cond_signal( &p_input->stream.stream_wait );
    vlc_mutex_unlock( &p_input->stream.stream_lock );

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

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/*****************************************************************************
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 * RunThread: main thread loop
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 *****************************************************************************
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 * Thread in charge of processing the network packets and demultiplexing.
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 *****************************************************************************/
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static void RunThread( input_thread_t *p_input )
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{
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    int                     i_error, i;
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    if( InitThread( p_input ) )
    {

        /* If we failed, wait before we are killed, and exit */
        *p_input->pi_status = THREAD_ERROR;
        p_input->b_error = 1;
        ErrorThread( p_input );
        DestroyThread( p_input );
        return;
    }
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    while( !p_input->b_die && !p_input->b_error && !p_input->b_eof )
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    {
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        data_packet_t *         pp_packets[p_input->i_read_once];
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#ifdef STATS
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        p_input->c_loops++;
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#endif

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        vlc_mutex_lock( &p_input->stream.stream_lock );
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        if( p_input->stream.p_selected_area->i_seek != NO_SEEK )
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        {
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            if( p_input->stream.b_seekable && p_input->pf_seek != NULL )
            {
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                p_input->pf_seek( p_input,
                                  p_input->stream.p_selected_area->i_seek );
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                for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
                {
                    pgrm_descriptor_t * p_pgrm
                                            = p_input->stream.pp_programs[i];
                    /* Escape all decoders for the stream discontinuity they
                     * will encounter. */
                    input_EscapeDiscontinuity( p_input, p_pgrm );

                    /* Reinitialize synchro. */
                    p_pgrm->i_synchro_state = SYNCHRO_REINIT;
                }
            }
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            p_input->stream.p_selected_area->i_seek = NO_SEEK;
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        }
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        vlc_mutex_unlock( &p_input->stream.stream_lock );
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        i_error = p_input->pf_read( p_input, pp_packets );
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        /* Demultiplex read packets. */
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        for( i = 0; i < p_input->i_read_once && pp_packets[i] != NULL; i++ )
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        {
            p_input->pf_demux( p_input, pp_packets[i] );
        }
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        if( i_error )
        {
            if( i_error == 1 )
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            {
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                /* End of file - we do not set b_die because only the
                 * interface is allowed to do so. */
                intf_WarnMsg( 1, "End of file reached" );
                p_input->b_eof = 1;
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            }
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            else
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            {
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                p_input->b_error = 1;
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            }
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        }
    }

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    if( p_input->b_error || p_input->b_eof )
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    {
        ErrorThread( p_input );
    }
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    EndThread( p_input );
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    DestroyThread( p_input );

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    intf_DbgMsg("Thread end");
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}

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/*****************************************************************************
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 * InitThread: init the input Thread
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 *****************************************************************************/
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static int InitThread( input_thread_t * p_input )
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{

#ifdef STATS
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    /* Initialize statistics */
    p_input->c_loops                    = 0;
    p_input->c_bytes                    = 0;
    p_input->c_payload_bytes            = 0;
    p_input->c_packets_read             = 0;
    p_input->c_packets_trashed          = 0;
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#endif
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    p_input->p_input_module = module_Need( p_main->p_bank,
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                                           MODULE_CAPABILITY_INPUT,
                                           (probedata_t *)p_input );
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    if( p_input->p_input_module == NULL )
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    {
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        intf_ErrMsg( "input error: no suitable input module" );
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        return( -1 );
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    }
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#define f p_input->p_input_module->p_functions->input.functions.input
    p_input->pf_init          = f.pf_init;
    p_input->pf_open          = f.pf_open;
    p_input->pf_close         = f.pf_close;
    p_input->pf_end           = f.pf_end;
    p_input->pf_read          = f.pf_read;
    p_input->pf_demux         = f.pf_demux;
    p_input->pf_new_packet    = f.pf_new_packet;
    p_input->pf_new_pes       = f.pf_new_pes;
    p_input->pf_delete_packet = f.pf_delete_packet;
    p_input->pf_delete_pes    = f.pf_delete_pes;
    p_input->pf_rewind        = f.pf_rewind;
    p_input->pf_seek          = f.pf_seek;
#undef f

    p_input->pf_open( p_input );
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    if( p_input->b_error )
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    {
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        /* We barfed -- exit nicely */
        p_input->pf_close( p_input );
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        module_Unneed( p_main->p_bank, p_input->p_input_module );
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        return( -1 );
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    }
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    p_input->pf_init( p_input );
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    *p_input->pi_status = THREAD_READY;
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    return( 0 );
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}

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/*****************************************************************************
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 * ErrorThread: RunThread() error loop
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 *****************************************************************************
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 * This function is called when an error occured during thread main's loop.
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 *****************************************************************************/
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static void ErrorThread( input_thread_t *p_input )
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{
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    while( !p_input->b_die )
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    {
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        /* Sleep a while */
        msleep( INPUT_IDLE_SLEEP );
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    }
}

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/*****************************************************************************
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 * EndThread: end the input thread
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 *****************************************************************************/
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static void EndThread( input_thread_t * p_input )
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{
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    int *       pi_status;                                  /* thread status */
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    /* Store status */
    pi_status = p_input->pi_status;
    *pi_status = THREAD_END;
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#ifdef STATS
    {
        struct tms cpu_usage;
        times( &cpu_usage );

        intf_Msg("input stats: cpu usage (user: %d, system: %d)",
                 cpu_usage.tms_utime, cpu_usage.tms_stime);
    }
#endif

    /* Free all ES and destroy all decoder threads */
    input_EndStream( p_input );

    /* Free demultiplexer's data */
    p_input->pf_end( p_input );

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    /* Close stream */
    p_input->pf_close( p_input );

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    /* Release modules */
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    module_Unneed( p_main->p_bank, p_input->p_input_module );
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}

/*****************************************************************************
 * DestroyThread: destroy the input thread
 *****************************************************************************/
static void DestroyThread( input_thread_t * p_input )
{
    int *       pi_status;                                  /* thread status */

    /* Store status */
    pi_status = p_input->pi_status;
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    /* Destroy Mutex locks */
    vlc_mutex_destroy( &p_input->stream.control.control_lock );
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    vlc_mutex_destroy( &p_input->stream.stream_lock );
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    /* Free input structure */
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    free( p_input );
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    /* Update status */
    *pi_status = THREAD_OVER;
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}
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/*****************************************************************************
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 * input_FileOpen : open a file descriptor
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 *****************************************************************************/
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void input_FileOpen( input_thread_t * p_input )
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{
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    struct stat         stat_info;
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    int                 i_stat;

    char *psz_name = p_input->p_source;
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    /* FIXME: this code ought to be in the plugin so that code can
     * be shared with the *_Probe function */
    if( ( i_stat = stat( psz_name, &stat_info ) ) == (-1) )
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    {
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        int i_size = strlen( psz_name );

        if( ( i_size > 4 )
            && !strncasecmp( psz_name, "dvd:", 4 ) )
        {
            /* get rid of the 'dvd:' stuff and try again */
            psz_name += 4;
            i_stat = stat( psz_name, &stat_info );
	}
	else if( ( i_size > 5 )
                 && !strncasecmp( psz_name, "file:", 5 ) )
        {
            /* get rid of the 'file:' stuff and try again */
            psz_name += 5;
            i_stat = stat( psz_name, &stat_info );
	}

	if( i_stat == (-1) )
        {
            intf_ErrMsg( "input error: cannot stat() file `%s' (%s)",
                         psz_name, strerror(errno));
            p_input->b_error = 1;
            return;
        }
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    }

    vlc_mutex_lock( &p_input->stream.stream_lock );

    /* If we are here we can control the pace... */
    p_input->stream.b_pace_control = 1;

    if( S_ISREG(stat_info.st_mode) || S_ISCHR(stat_info.st_mode)
         || S_ISBLK(stat_info.st_mode) )
    {
        p_input->stream.b_seekable = 1;
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        p_input->stream.p_selected_area->i_size = stat_info.st_size;
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    }
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    else if( S_ISFIFO(stat_info.st_mode)
#ifndef SYS_BEOS
             || S_ISSOCK(stat_info.st_mode)
#endif
             )
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    {
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        p_input->stream.b_seekable = 0;
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        p_input->stream.p_selected_area->i_size = 0;
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    }
    else
    {
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        vlc_mutex_unlock( &p_input->stream.stream_lock );
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        intf_ErrMsg( "input error: unknown file type for `%s'",
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                     psz_name );
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        p_input->b_error = 1;
        return;
    }
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    p_input->stream.p_selected_area->i_tell = 0;
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    vlc_mutex_unlock( &p_input->stream.stream_lock );

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    intf_Msg( "input: opening %s", p_input->p_source );
    if( (p_input->i_handle = open( psz_name,
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                                   /*O_NONBLOCK | O_LARGEFILE*/0 )) == (-1) )
    {
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        intf_ErrMsg( "input error: cannot open file (%s)", strerror(errno) );
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        p_input->b_error = 1;
        return;
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    }

}
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/*****************************************************************************
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 * input_FileClose : close a file descriptor
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 *****************************************************************************/
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void input_FileClose( input_thread_t * p_input )
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{
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    close( p_input->i_handle );
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    return;
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}
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