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VLC Source 0.5.3.dmg
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input
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input.c
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2003-04-07
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/*****************************************************************************
* input.c: input thread
* Read an MPEG2 stream, demultiplex and parse it before sending it to
* decoders.
*****************************************************************************
* Copyright (C) 1998-2002 VideoLAN
* $Id: input.c,v 1.228 2003/03/30 01:13:37 massiot Exp $
*
* Authors: Christophe Massiot <massiot@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.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <stdlib.h>
#include <vlc/vlc.h>
#include <string.h>
#ifdef HAVE_SYS_TIMES_H
# include <sys/times.h>
#endif
#include "netutils.h"
#include "vlc_playlist.h"
#include "stream_control.h"
#include "input_ext-intf.h"
#include "input_ext-dec.h"
#include "input_ext-plugins.h"
#include "stream_output.h"
#include <vlc/vout.h>
#include "interface.h"
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int RunThread ( input_thread_t *p_input );
static int InitThread ( input_thread_t *p_input );
static void ErrorThread ( input_thread_t *p_input );
static void EndThread ( input_thread_t *p_input );
/*****************************************************************************
* input_CreateThread: creates a new input thread
*****************************************************************************
* This function creates a new input, and returns a pointer
* to its description. On error, it returns NULL.
*****************************************************************************/
input_thread_t *__input_CreateThread( vlc_object_t *p_parent,
playlist_item_t *p_item )
{
input_thread_t * p_input; /* thread descriptor */
input_info_category_t * p_info;
/* Allocate descriptor */
p_input = vlc_object_create( p_parent, VLC_OBJECT_INPUT );
if( p_input == NULL )
{
msg_Err( p_parent, "out of memory" );
return NULL;
}
/* Initialize thread properties */
p_input->b_eof = 0;
/* Set target */
p_input->psz_source = strdup( p_item->psz_uri );
/* Demux */
p_input->p_demux = NULL;
/* Access */
p_input->p_access = NULL;
p_input->i_bufsize = 0;
p_input->i_mtu = 0;
p_input->i_pts_delay = DEFAULT_PTS_DELAY;
/* Initialize statistics */
p_input->c_loops = 0;
p_input->stream.c_packets_read = 0;
p_input->stream.c_packets_trashed = 0;
/* Set locks. */
vlc_mutex_init( p_input, &p_input->stream.stream_lock );
vlc_cond_init( p_input, &p_input->stream.stream_wait );
vlc_mutex_init( p_input, &p_input->stream.control.control_lock );
/* Initialize stream description */
p_input->stream.b_changed = 0;
p_input->stream.i_es_number = 0;
p_input->stream.i_selected_es_number = 0;
p_input->stream.i_pgrm_number = 0;
p_input->stream.i_new_status = p_input->stream.i_new_rate = 0;
p_input->stream.b_new_mute = MUTE_NO_CHANGE;
p_input->stream.i_mux_rate = 0;
p_input->stream.b_seekable = 0;
p_input->stream.p_sout = NULL;
/* no stream, no program, no area, no es */
p_input->stream.p_new_program = NULL;
p_input->stream.i_area_nb = 0;
p_input->stream.pp_areas = NULL;
p_input->stream.p_selected_area = NULL;
p_input->stream.p_new_area = NULL;
p_input->stream.pp_selected_es = NULL;
p_input->stream.p_removed_es = NULL;
p_input->stream.p_newly_selected_es = NULL;
/* By default there is one area in a stream */
input_AddArea( p_input, 0, 1 );
p_input->stream.p_selected_area = p_input->stream.pp_areas[0];
/* 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_grayscale = config_GetInt( p_input, "grayscale" );
/* Initialize input info */
p_input->stream.p_info = malloc( sizeof( input_info_category_t ) );
if( !p_input->stream.p_info )
{
msg_Err( p_input, "No memory!" );
return NULL;
}
p_input->stream.p_info->psz_name = strdup("General") ;
p_input->stream.p_info->p_info = NULL;
p_input->stream.p_info->p_next = NULL;
msg_Info( p_input, "playlist item `%s'", p_input->psz_source );
p_info = input_InfoCategory( p_input, _("General") );
input_AddInfo( p_info, _("Playlist Item"), p_input->psz_source );
vlc_object_attach( p_input, p_parent );
/* Create thread and wait for its readiness. */
if( vlc_thread_create( p_input, "input", RunThread,
VLC_THREAD_PRIORITY_INPUT, VLC_TRUE ) )
{
msg_Err( p_input, "cannot create input thread" );
free( p_input );
return NULL;
}
return p_input;
}
/*****************************************************************************
* input_StopThread: mark an input thread as zombie
*****************************************************************************
* This function should not return until the thread is effectively cancelled.
*****************************************************************************/
void input_StopThread( input_thread_t *p_input )
{
/* Make the thread exit from a possible vlc_cond_wait() */
vlc_mutex_lock( &p_input->stream.stream_lock );
/* Request thread destruction */
p_input->b_die = 1;
vlc_cond_signal( &p_input->stream.stream_wait );
vlc_mutex_unlock( &p_input->stream.stream_lock );
}
/*****************************************************************************
* input_DestroyThread: mark an input thread as zombie
*****************************************************************************
* This function should not return until the thread is effectively cancelled.
*****************************************************************************/
void input_DestroyThread( input_thread_t *p_input )
{
/* Join the thread */
vlc_thread_join( p_input );
/* Destroy Mutex locks */
vlc_mutex_destroy( &p_input->stream.control.control_lock );
vlc_cond_destroy( &p_input->stream.stream_wait );
vlc_mutex_destroy( &p_input->stream.stream_lock );
}
/*****************************************************************************
* RunThread: main thread loop
*****************************************************************************
* Thread in charge of processing the network packets and demultiplexing.
*****************************************************************************/
static int RunThread( input_thread_t *p_input )
{
/* Signal right now, otherwise we'll get stuck in a peek */
vlc_thread_ready( p_input );
if( InitThread( p_input ) )
{
/* If we failed, wait before we are killed, and exit */
p_input->b_error = 1;
ErrorThread( p_input );
p_input->b_dead = 1;
return 0;
}
/* initialization is complete */
vlc_mutex_lock( &p_input->stream.stream_lock );
p_input->stream.b_changed = 1;
vlc_mutex_unlock( &p_input->stream.stream_lock );
while( !p_input->b_die && !p_input->b_error && !p_input->b_eof )
{
unsigned int i, i_count;
p_input->c_loops++;
vlc_mutex_lock( &p_input->stream.stream_lock );
if( p_input->stream.p_new_program )
{
if( p_input->pf_set_program != NULL )
{
/* Reinitialize buffer manager. */
input_AccessReinit( p_input );
p_input->pf_set_program( p_input,
p_input->stream.p_new_program );
/* Escape all decoders for the stream discontinuity they
* will encounter. */
input_EscapeDiscontinuity( p_input );
for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
{
pgrm_descriptor_t * p_pgrm
= p_input->stream.pp_programs[i];
/* Reinitialize synchro. */
p_pgrm->i_synchro_state = SYNCHRO_REINIT;
}
}
p_input->stream.p_new_program = NULL;
}
if( p_input->stream.p_new_area )
{
if( p_input->stream.b_seekable && p_input->pf_set_area != NULL )
{
input_AccessReinit( p_input );
p_input->pf_set_area( p_input, p_input->stream.p_new_area );
/* Escape all decoders for the stream discontinuity they
* will encounter. */
input_EscapeDiscontinuity( p_input );
for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
{
pgrm_descriptor_t * p_pgrm
= p_input->stream.pp_programs[i];
/* Reinitialize synchro. */
p_pgrm->i_synchro_state = SYNCHRO_REINIT;
}
}
p_input->stream.p_new_area = NULL;
}
if( p_input->stream.p_selected_area->i_seek != NO_SEEK )
{
if( p_input->stream.b_seekable
&& p_input->pf_seek != NULL )
{
off_t i_new_pos;
/* Reinitialize buffer manager. */
input_AccessReinit( p_input );
i_new_pos = p_input->stream.p_selected_area->i_seek;
vlc_mutex_unlock( &p_input->stream.stream_lock );
p_input->pf_seek( p_input, i_new_pos );
vlc_mutex_lock( &p_input->stream.stream_lock );
/* Escape all decoders for the stream discontinuity they
* will encounter. */
input_EscapeDiscontinuity( p_input );
for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
{
pgrm_descriptor_t * p_pgrm
= p_input->stream.pp_programs[i];
/* Reinitialize synchro. */
p_pgrm->i_synchro_state = SYNCHRO_REINIT;
}
}
p_input->stream.p_selected_area->i_seek = NO_SEEK;
}
if( p_input->stream.p_removed_es )
{
input_UnselectES( p_input, p_input->stream.p_removed_es );
p_input->stream.p_removed_es = NULL;
}
if( p_input->stream.p_newly_selected_es )
{
input_SelectES( p_input, p_input->stream.p_newly_selected_es );
p_input->stream.p_newly_selected_es = NULL;
}
if( p_input->stream.b_new_mute != MUTE_NO_CHANGE )
{
if( p_input->stream.b_new_mute )
{
input_EscapeAudioDiscontinuity( p_input );
}
vlc_mutex_lock( &p_input->stream.control.control_lock );
p_input->stream.control.b_mute = p_input->stream.b_new_mute;
vlc_mutex_unlock( &p_input->stream.control.control_lock );
p_input->stream.b_new_mute = MUTE_NO_CHANGE;
}
vlc_mutex_unlock( &p_input->stream.stream_lock );
/* Read and demultiplex some data. */
i_count = p_input->pf_demux( p_input );
if( i_count == 0 )
{
/* End of file - we do not set b_die because only the
* playlist is allowed to do so. */
msg_Info( p_input, "EOF reached" );
p_input->b_eof = 1;
}
else if( i_count < 0 )
{
p_input->b_error = 1;
}
}
if( p_input->b_error || p_input->b_eof )
{
ErrorThread( p_input );
}
EndThread( p_input );
return 0;
}
/*****************************************************************************
* InitThread: init the input Thread
*****************************************************************************/
static int InitThread( input_thread_t * p_input )
{
/* Parse source string. Syntax : [[<access>][/<demux>]:][<source>] */
char * psz_parser = p_input->psz_dupsource = strdup(p_input->psz_source);
/* Skip the plug-in names */
while( *psz_parser && *psz_parser != ':' )
{
psz_parser++;
}
#if defined( WIN32 ) || defined( UNDER_CE )
if( psz_parser - p_input->psz_dupsource == 1 )
{
msg_Warn( p_input, "drive letter %c: found in source string",
p_input->psz_dupsource[0] ) ;
psz_parser = "";
}
#endif
if( !*psz_parser )
{
p_input->psz_access = p_input->psz_demux = "";
p_input->psz_name = p_input->psz_source;
free( p_input->psz_dupsource );
p_input->psz_dupsource = NULL;
}
else
{
*psz_parser++ = '\0';
/* let's skip '//' */
if( psz_parser[0] == '/' && psz_parser[1] == '/' )
{
psz_parser += 2 ;
}
p_input->psz_name = psz_parser ;
/* Come back to parse the access and demux plug-ins */
psz_parser = p_input->psz_dupsource;
if( !*psz_parser )
{
/* No access */
p_input->psz_access = "";
}
else if( *psz_parser == '/' )
{
/* No access */
p_input->psz_access = "";
psz_parser++;
}
else
{
p_input->psz_access = psz_parser;
while( *psz_parser && *psz_parser != '/' )
{
psz_parser++;
}
if( *psz_parser == '/' )
{
*psz_parser++ = '\0';
}
}
if( !*psz_parser )
{
/* No demux */
p_input->psz_demux = "";
}
else
{
p_input->psz_demux = psz_parser;
}
}
msg_Dbg( p_input, "access `%s', demux `%s', name `%s'",
p_input->psz_access, p_input->psz_demux, p_input->psz_name );
if( input_AccessInit( p_input ) == -1 )
{
return -1;
}
/* Find and open appropriate access module */
p_input->p_access = module_Need( p_input, "access",
p_input->psz_access );
if ( p_input->p_access == NULL
&& (*p_input->psz_demux || *p_input->psz_access) )
{
/* Maybe we got something like :
* /Volumes/toto:titi/gabu.mpg */
p_input->psz_access = p_input->psz_demux = "";
p_input->psz_name = p_input->psz_source;
free( p_input->psz_dupsource);
p_input->psz_dupsource = NULL;
p_input->p_access = module_Need( p_input, "access",
p_input->psz_access );
}
if( p_input->p_access == NULL )
{
msg_Err( p_input, "no suitable access module for `%s/%s://%s'",
p_input->psz_access, p_input->psz_demux, p_input->psz_name );
return -1;
}
/* Waiting for stream. */
if( p_input->i_mtu )
{
p_input->i_bufsize = p_input->i_mtu;
}
else
{
p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
}
if( p_input->p_current_data == NULL && p_input->pf_read != NULL )
{
while( !input_FillBuffer( p_input ) )
{
if( p_input->b_die || p_input->b_error || p_input->b_eof )
{
module_Unneed( p_input, p_input->p_access );
return -1;
}
}
}
/* Find and open appropriate demux module */
p_input->p_demux = module_Need( p_input, "demux",
p_input->psz_demux );
if( p_input->p_demux == NULL )
{
msg_Err( p_input, "no suitable demux module for `%s/%s://%s'",
p_input->psz_access, p_input->psz_demux, p_input->psz_name );
module_Unneed( p_input, p_input->p_access );
return -1;
}
/* Initialize optional stream output. */
psz_parser = config_GetPsz( p_input, "sout" );
if ( psz_parser != NULL )
{
if ( *psz_parser &&
(p_input->stream.p_sout = sout_NewInstance( p_input, psz_parser ))
== NULL )
{
msg_Err( p_input, "cannot start stream output instance, aborting" );
free( psz_parser );
module_Unneed( p_input, p_input->p_access );
module_Unneed( p_input, p_input->p_demux );
return -1;
}
free( psz_parser );
}
return 0;
}
/*****************************************************************************
* ErrorThread: RunThread() error loop
*****************************************************************************
* This function is called when an error occured during thread main's loop.
*****************************************************************************/
static void ErrorThread( input_thread_t *p_input )
{
while( !p_input->b_die )
{
/* Sleep a while */
msleep( INPUT_IDLE_SLEEP );
}
}
/*****************************************************************************
* EndThread: end the input thread
*****************************************************************************/
static void EndThread( input_thread_t * p_input )
{
vlc_object_t *p_object;
#ifdef HAVE_SYS_TIMES_H
/* Display statistics */
struct tms cpu_usage;
times( &cpu_usage );
msg_Dbg( p_input, "%ld loops consuming user: %ld, system: %ld",
p_input->c_loops, cpu_usage.tms_utime, cpu_usage.tms_stime );
#else
msg_Dbg( p_input, "%ld loops", p_input->c_loops );
#endif
/* Free info structures */
msg_Dbg( p_input, "freeing info structures...");
input_DelInfo( p_input );
input_DumpStream( p_input );
/* Free all ES and destroy all decoder threads */
input_EndStream( p_input );
/* Close optional stream output instance */
if ( p_input->stream.p_sout != NULL )
{
sout_DeleteInstance( p_input->stream.p_sout );
}
/* Free demultiplexer's data */
module_Unneed( p_input, p_input->p_demux );
/* Close the access plug-in */
module_Unneed( p_input, p_input->p_access );
input_AccessEnd( p_input );
/* Close the video output that should have been re-attached
* to our object */
p_object = vlc_object_find( p_input, VLC_OBJECT_VOUT, FIND_CHILD );
if( p_object )
{
vlc_object_detach( p_object );
vlc_object_release( p_object );
vout_Destroy( (vout_thread_t *)p_object );
}
free( p_input->psz_source );
if ( p_input->psz_dupsource != NULL ) free( p_input->psz_dupsource );
/* Tell we're dead */
p_input->b_dead = 1;
}