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vlc/plugins/mpeg/input_ps.c

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/*****************************************************************************
* input_ps.c: PS demux and packet management
*****************************************************************************
* Copyright (C) 1998, 1999, 2000 VideoLAN
* $Id: input_ps.c,v 1.23 2001/05/08 00:43:57 sam Exp $
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
* Cyril Deguet <asmax@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.
*****************************************************************************/
#define MODULE_NAME ps
#include "modules_inner.h"
/*****************************************************************************
* Preamble
*****************************************************************************/
#include "defs.h"
#include <stdlib.h>
#include <string.h>
#ifdef STRNCASECMP_IN_STRINGS_H
# include <strings.h>
#endif
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include "config.h"
#include "common.h"
#include "threads.h"
#include "mtime.h"
#include "tests.h"
#include "intf_msg.h"
#include "main.h"
#include "stream_control.h"
#include "input_ext-intf.h"
#include "input_ext-dec.h"
#include "input.h"
#include "input_ps.h"
#include "mpeg_system.h"
#include "debug.h"
#include "modules.h"
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int PSProbe ( probedata_t * );
static int PSRead ( struct input_thread_s *,
data_packet_t * p_packets[INPUT_READ_ONCE] );
static void PSInit ( struct input_thread_s * );
static void PSEnd ( struct input_thread_s * );
static void PSSeek ( struct input_thread_s *, off_t );
static struct pes_packet_s * NewPES ( void * );
static struct data_packet_s * NewPacket ( void *, size_t );
static void DeletePacket( void *, struct data_packet_s * );
static void DeletePES ( void *, struct pes_packet_s * );
/*****************************************************************************
* Functions exported as capabilities. They are declared as static so that
* we don't pollute the namespace too much.
*****************************************************************************/
void _M( input_getfunctions )( function_list_t * p_function_list )
{
#define input p_function_list->functions.input
p_function_list->pf_probe = PSProbe;
input.pf_init = PSInit;
input.pf_open = input_FileOpen;
input.pf_close = input_FileClose;
input.pf_end = PSEnd;
input.pf_set_area = NULL;
input.pf_read = PSRead;
input.pf_demux = input_DemuxPS;
input.pf_new_packet = NewPacket;
input.pf_new_pes = NewPES;
input.pf_delete_packet = DeletePacket;
input.pf_delete_pes = DeletePES;
input.pf_rewind = NULL;
input.pf_seek = PSSeek;
#undef input
}
/*
* Data reading functions
*/
/*****************************************************************************
* PSProbe: verifies that the stream is a PS stream
*****************************************************************************/
static int PSProbe( probedata_t *p_data )
{
input_thread_t * p_input = (input_thread_t *)p_data;
char * psz_name = p_input->p_source;
int i_handle;
int i_score = 10;
if( TestMethod( INPUT_METHOD_VAR, "ps" ) )
{
return( 999 );
}
if( ( strlen(psz_name) > 5 ) && !strncasecmp( psz_name, "file:", 5 ) )
{
/* If the user specified "file:" then it's probably a file */
i_score = 100;
psz_name += 5;
}
i_handle = open( psz_name, 0 );
if( i_handle == -1 )
{
return( 0 );
}
close( i_handle );
return( i_score );
}
/*****************************************************************************
* PSInit: initializes PS structures
*****************************************************************************/
static void PSInit( input_thread_t * p_input )
{
thread_ps_data_t * p_method;
packet_cache_t * p_packet_cache;
if( (p_method =
(thread_ps_data_t *)malloc( sizeof(thread_ps_data_t) )) == NULL )
{
intf_ErrMsg( "Out of memory" );
p_input->b_error = 1;
return;
}
p_input->p_plugin_data = (void *)p_method;
/* creates the packet cache structure */
p_packet_cache = malloc( sizeof(packet_cache_t) );
if ( p_packet_cache == NULL )
{
intf_ErrMsg( "Out of memory" );
p_input->b_error = 1;
return;
}
p_input->p_method_data = (void *)p_packet_cache;
/* Initialize packet cache mutex */
vlc_mutex_init( &p_packet_cache->lock );
/* allocates the data cache */
p_packet_cache->data.p_stack = malloc( DATA_CACHE_SIZE *
sizeof(data_packet_t*) );
if ( p_packet_cache->data.p_stack == NULL )
{
intf_ErrMsg( "Out of memory" );
p_input->b_error = 1;
return;
}
p_packet_cache->data.l_index = 0;
/* allocates the PES cache */
p_packet_cache->pes.p_stack = malloc( PES_CACHE_SIZE *
sizeof(pes_packet_t*) );
if ( p_packet_cache->pes.p_stack == NULL )
{
intf_ErrMsg( "Out of memory" );
p_input->b_error = 1;
return;
}
p_packet_cache->pes.l_index = 0;
/* allocates the small buffer cache */
p_packet_cache->small.p_stack = malloc( SMALL_CACHE_SIZE *
sizeof(packet_buffer_t) );
if ( p_packet_cache->small.p_stack == NULL )
{
intf_ErrMsg( "Out of memory" );
p_input->b_error = 1;
return;
}
p_packet_cache->small.l_index = 0;
/* allocates the large buffer cache */
p_packet_cache->large.p_stack = malloc( LARGE_CACHE_SIZE *
sizeof(packet_buffer_t) );
if ( p_packet_cache->large.p_stack == NULL )
{
intf_ErrMsg( "Out of memory" );
p_input->b_error = 1;
return;
}
p_packet_cache->large.l_index = 0;
/* Re-open the socket as a buffered FILE stream */
if( (p_method->stream = fdopen( p_input->i_handle, "r" )) == NULL )
{
intf_ErrMsg( "Cannot open file (%s)", strerror(errno) );
p_input->b_error = 1;
return;
}
rewind( p_method->stream );
/* FIXME : detect if InitStream failed */
input_InitStream( p_input, sizeof( stream_ps_data_t ) );
input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
if( p_input->stream.b_seekable )
{
stream_ps_data_t * p_demux_data =
(stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
/* Pre-parse the stream to gather stream_descriptor_t. */
p_input->stream.pp_programs[0]->b_is_ok = 0;
p_demux_data->i_PSM_version = EMPTY_PSM_VERSION;
while( !p_input->b_die && !p_input->b_error
&& !p_demux_data->b_has_PSM )
{
int i_result, i;
data_packet_t * pp_packets[INPUT_READ_ONCE];
i_result = PSRead( p_input, pp_packets );
if( i_result == 1 )
{
/* EOF */
vlc_mutex_lock( &p_input->stream.stream_lock );
p_input->stream.pp_programs[0]->b_is_ok = 1;
vlc_mutex_unlock( &p_input->stream.stream_lock );
break;
}
if( i_result == -1 )
{
p_input->b_error = 1;
break;
}
for( i = 0; i < INPUT_READ_ONCE && pp_packets[i] != NULL; i++ )
{
/* FIXME: use i_p_config_t */
input_ParsePS( p_input, pp_packets[i] );
DeletePacket( p_input->p_method_data, pp_packets[i] );
}
/* File too big. */
if( p_input->stream.p_selected_area->i_tell >
INPUT_PREPARSE_LENGTH )
{
break;
}
}
rewind( p_method->stream );
vlc_mutex_lock( &p_input->stream.stream_lock );
p_input->stream.i_method = INPUT_METHOD_FILE;
p_input->stream.p_selected_area->i_tell = 0;
if( p_demux_data->b_has_PSM )
{
/* (The PSM decoder will care about spawning the decoders) */
p_input->stream.pp_programs[0]->b_is_ok = 1;
}
#ifdef AUTO_SPAWN
else
{
/* (We have to do it ourselves) */
int i_es;
/* FIXME: we should do multiple passes in case an audio type
* is not present */
for( i_es = 0;
i_es < p_input->stream.pp_programs[0]->i_es_number;
i_es++ )
{
#define p_es p_input->stream.pp_programs[0]->pp_es[i_es]
switch( p_es->i_type )
{
case MPEG1_VIDEO_ES:
case MPEG2_VIDEO_ES:
input_SelectES( p_input, p_es );
break;
case MPEG1_AUDIO_ES:
case MPEG2_AUDIO_ES:
if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
== (p_es->i_id & 0x1F) )
switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
{
case 0:
main_PutIntVariable( INPUT_AUDIO_VAR,
REQUESTED_MPEG );
case REQUESTED_MPEG:
input_SelectES( p_input, p_es );
}
break;
case AC3_AUDIO_ES:
if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
== ((p_es->i_id & 0xF00) >> 8) )
switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
{
case 0:
main_PutIntVariable( INPUT_AUDIO_VAR,
REQUESTED_AC3 );
case REQUESTED_AC3:
input_SelectES( p_input, p_es );
}
break;
case DVD_SPU_ES:
if( main_GetIntVariable( INPUT_SUBTITLE_VAR, -1 )
== ((p_es->i_id & 0x1F00) >> 8) )
{
input_SelectES( p_input, p_es );
}
break;
case LPCM_AUDIO_ES:
/* FIXME ! */
break;
}
}
}
#endif
#ifdef STATS
input_DumpStream( p_input );
#endif
vlc_mutex_unlock( &p_input->stream.stream_lock );
}
else
{
/* The programs will be added when we read them. */
vlc_mutex_lock( &p_input->stream.stream_lock );
p_input->stream.i_method = INPUT_METHOD_FILE;
p_input->stream.pp_programs[0]->b_is_ok = 0;
vlc_mutex_unlock( &p_input->stream.stream_lock );
}
}
/*****************************************************************************
* PSEnd: frees unused data
*****************************************************************************/
static void PSEnd( input_thread_t * p_input )
{
vlc_mutex_destroy( &((packet_cache_t *)p_input->p_plugin_data)->lock );
free( p_input->p_plugin_data );
}
/*****************************************************************************
* SafeRead: reads a chunk of stream and correctly detects errors
*****************************************************************************/
static __inline__ int SafeRead( input_thread_t * p_input, byte_t * p_buffer,
size_t i_len )
{
thread_ps_data_t * p_method;
int i_error;
p_method = (thread_ps_data_t *)p_input->p_plugin_data;
while( fread( p_buffer, i_len, 1, p_method->stream ) != 1 )
{
if( feof( p_method->stream ) )
{
return( 1 );
}
if( (i_error = ferror( p_method->stream )) )
{
intf_ErrMsg( "Read failed (%s)", strerror(i_error) );
return( -1 );
}
}
vlc_mutex_lock( &p_input->stream.stream_lock );
p_input->stream.p_selected_area->i_tell += i_len;
vlc_mutex_unlock( &p_input->stream.stream_lock );
return( 0 );
}
/*****************************************************************************
* PSRead: reads data packets
*****************************************************************************
* Returns -1 in case of error, 0 if everything went well, and 1 in case of
* EOF.
*****************************************************************************/
static int PSRead( input_thread_t * p_input,
data_packet_t * pp_packets[INPUT_READ_ONCE] )
{
byte_t p_header[6];
data_packet_t * p_data;
size_t i_packet_size;
int i_packet, i_error;
thread_ps_data_t * p_method;
p_method = (thread_ps_data_t *)p_input->p_plugin_data;
memset( pp_packets, 0, INPUT_READ_ONCE * sizeof(data_packet_t *) );
for( i_packet = 0; i_packet < INPUT_READ_ONCE; i_packet++ )
{
/* Read what we believe to be a packet header. */
if( (i_error = SafeRead( p_input, p_header, 6 )) )
{
return( i_error );
}
if( (U32_AT(p_header) & 0xFFFFFF00) != 0x100L )
{
/* This is not the startcode of a packet. Read the stream
* until we find one. */
u32 i_startcode = U32_AT(p_header);
int i_dummy;
if( i_startcode )
{
/* It is common for MPEG-1 streams to pad with zeros
* (although it is forbidden by the recommendation), so
* don't bother everybody in this case. */
intf_WarnMsg( 3, "Garbage at input (%.8x)", i_startcode );
}
while( (i_startcode & 0xFFFFFF00) != 0x100L )
{
i_startcode <<= 8;
if( (i_dummy = getc( p_method->stream )) != EOF )
{
i_startcode |= i_dummy;
}
else
{
return( 1 );
}
}
/* Packet found. */
*(u32 *)p_header = U32_AT(&i_startcode);
if( (i_error = SafeRead( p_input, p_header + 4, 2 )) )
{
return( i_error );
}
}
if( U32_AT(p_header) != 0x1BA )
{
/* That's the case for all packets, except pack header. */
i_packet_size = U16_AT(&p_header[4]);
}
else
{
/* Pack header. */
if( (p_header[4] & 0xC0) == 0x40 )
{
/* MPEG-2 */
i_packet_size = 8;
}
else if( (p_header[4] & 0xF0) == 0x20 )
{
/* MPEG-1 */
i_packet_size = 6;
}
else
{
intf_ErrMsg( "Unable to determine stream type" );
return( -1 );
}
}
/* Fetch a packet of the appropriate size. */
if( (p_data = NewPacket( p_input->p_method_data, i_packet_size + 6 ))
== NULL )
{
intf_ErrMsg( "Out of memory" );
return( -1 );
}
/* Copy the header we already read. */
memcpy( p_data->p_buffer, p_header, 6 );
/* Read the remaining of the packet. */
if( i_packet_size && (i_error =
SafeRead( p_input, p_data->p_buffer + 6, i_packet_size )) )
{
return( i_error );
}
/* In MPEG-2 pack headers we still have to read stuffing bytes. */
if( U32_AT(p_header) == 0x1BA )
{
if( i_packet_size == 8 && (p_data->p_buffer[13] & 0x7) != 0 )
{
/* MPEG-2 stuffing bytes */
byte_t p_garbage[8];
if( (i_error = SafeRead( p_input, p_garbage,
p_data->p_buffer[13] & 0x7)) )
{
return( i_error );
}
}
}
/* Give the packet to the other input stages. */
pp_packets[i_packet] = p_data;
}
return( 0 );
}
/*****************************************************************************
* PSSeek: changes the stream position indicator
*****************************************************************************/
static void PSSeek( input_thread_t * p_input, off_t i_position )
{
thread_ps_data_t * p_method;
p_method = (thread_ps_data_t *)p_input->p_plugin_data;
/* A little bourrin but should work for a while --Meuuh */
#ifndef WIN32
fseeko( p_method->stream, i_position, SEEK_SET );
#else
fseek( p_method->stream, (long)i_position, SEEK_SET );
#endif
p_input->stream.p_selected_area->i_tell = i_position;
}
/*
* Packet management utilities
*/
/*****************************************************************************
* NewPacket: allocates a data packet
*****************************************************************************/
static struct data_packet_s * NewPacket( void * p_packet_cache,
size_t l_size )
{
packet_cache_t * p_cache;
data_packet_t * p_data;
long l_index;
p_cache = (packet_cache_t *)p_packet_cache;
#ifdef DEBUG
if ( p_cache == NULL )
{
intf_ErrMsg( "PPacket cache not initialized" );
return NULL;
}
#endif
/* Safety check */
if( l_size > INPUT_MAX_PACKET_SIZE )
{
intf_ErrMsg( "Packet too big (%d)", l_size );
return NULL;
}
vlc_mutex_lock( &p_cache->lock );
/* Checks whether the data cache is empty */
if( p_cache->data.l_index == 0 )
{
/* Allocates a new packet */
if ( (p_data = malloc( sizeof(data_packet_t) )) == NULL )
{
intf_ErrMsg( "Out of memory" );
vlc_mutex_unlock( &p_cache->lock );
return NULL;
}
#ifdef TRACE_INPUT
intf_DbgMsg( "PS input: data packet allocated" );
#endif
}
else
{
/* Takes the packet out from the cache */
if( (p_data = p_cache->data.p_stack[ -- p_cache->data.l_index ])
== NULL )
{
intf_ErrMsg( "NULL packet in the data cache" );
vlc_mutex_unlock( &p_cache->lock );
return NULL;
}
}
if( l_size < MAX_SMALL_SIZE )
{
/* Small buffer */
/* Checks whether the buffer cache is empty */
if( p_cache->small.l_index == 0 )
{
/* Allocates a new packet */
if ( (p_data->p_buffer = malloc( l_size )) == NULL )
{
intf_DbgMsg( "Out of memory" );
free( p_data );
vlc_mutex_unlock( &p_cache->lock );
return NULL;
}
#ifdef TRACE_INPUT
intf_DbgMsg( "PS input: small buffer allocated" );
#endif
p_data->l_size = l_size;
}
else
{
/* Takes the packet out from the cache */
l_index = -- p_cache->small.l_index;
if( (p_data->p_buffer = p_cache->small.p_stack[l_index].p_data)
== NULL )
{
intf_ErrMsg( "NULL packet in the small buffer cache" );
free( p_data );
vlc_mutex_unlock( &p_cache->lock );
return NULL;
}
/* Reallocates the packet if it is too small or too large */
if( p_cache->small.p_stack[l_index].l_size < l_size ||
p_cache->small.p_stack[l_index].l_size > 2*l_size )
{
p_data->p_buffer = realloc( p_data->p_buffer, l_size );
p_data->l_size = l_size;
}
else
{
p_data->l_size = p_cache->small.p_stack[l_index].l_size;
}
}
}
else
{
/* Large buffer */
/* Checks whether the buffer cache is empty */
if( p_cache->large.l_index == 0 )
{
/* Allocates a new packet */
if ( (p_data->p_buffer = malloc( l_size )) == NULL )
{
intf_ErrMsg( "Out of memory" );
free( p_data );
vlc_mutex_unlock( &p_cache->lock );
return NULL;
}
#ifdef TRACE_INPUT
intf_DbgMsg( "PS input: large buffer allocated" );
#endif
p_data->l_size = l_size;
}
else
{
/* Takes the packet out from the cache */
l_index = -- p_cache->large.l_index;
if( (p_data->p_buffer = p_cache->large.p_stack[l_index].p_data)
== NULL )
{
intf_ErrMsg( "NULL packet in the small buffer cache" );
free( p_data );
vlc_mutex_unlock( &p_cache->lock );
return NULL;
}
/* Reallocates the packet if it is too small or too large */
if( p_cache->large.p_stack[l_index].l_size < l_size ||
p_cache->large.p_stack[l_index].l_size > 2*l_size )
{
p_data->p_buffer = realloc( p_data->p_buffer, l_size );
p_data->l_size = l_size;
}
else
{
p_data->l_size = p_cache->large.p_stack[l_index].l_size;
}
}
}
vlc_mutex_unlock( &p_cache->lock );
/* Initialize data */
p_data->p_next = NULL;
p_data->b_discard_payload = 0;
p_data->p_payload_start = p_data->p_buffer;
p_data->p_payload_end = p_data->p_buffer + l_size;
return( p_data );
}
/*****************************************************************************
* NewPES: allocates a pes packet
*****************************************************************************/
static pes_packet_t * NewPES( void * p_packet_cache )
{
packet_cache_t * p_cache;
pes_packet_t * p_pes;
p_cache = (packet_cache_t *)p_packet_cache;
#ifdef DEBUG
if ( p_cache == NULL )
{
intf_ErrMsg( "Packet cache not initialized" );
return NULL;
}
#endif
vlc_mutex_lock( &p_cache->lock );
/* Checks whether the PES cache is empty */
if( p_cache->pes.l_index == 0 )
{
/* Allocates a new packet */
if ( (p_pes = malloc( sizeof(pes_packet_t) )) == NULL )
{
intf_DbgMsg( "Out of memory" );
vlc_mutex_unlock( &p_cache->lock );
return NULL;
}
#ifdef TRACE_INPUT
intf_DbgMsg( "PS input: PES packet allocated" );
#endif
}
else
{
/* Takes the packet out from the cache */
if( (p_pes = p_cache->pes.p_stack[ -- p_cache->pes.l_index ])
== NULL )
{
intf_ErrMsg( "NULL packet in the data cache" );
vlc_mutex_unlock( &p_cache->lock );
return NULL;
}
}
vlc_mutex_unlock( &p_cache->lock );
p_pes->b_data_alignment = p_pes->b_discontinuity =
p_pes->i_pts = p_pes->i_dts = 0;
p_pes->i_pes_size = 0;
p_pes->p_first = NULL;
return( p_pes );
}
/*****************************************************************************
* DeletePacket: deletes a data packet
*****************************************************************************/
static void DeletePacket( void * p_packet_cache,
data_packet_t * p_data )
{
packet_cache_t * p_cache;
p_cache = (packet_cache_t *)p_packet_cache;
#ifdef DEBUG
if ( p_cache == NULL )
{
intf_ErrMsg( "Packet cache not initialized" );
return;
}
#endif
ASSERT( p_data );
vlc_mutex_lock( &p_cache->lock );
/* Checks whether the data cache is full */
if ( p_cache->data.l_index < DATA_CACHE_SIZE )
{
/* Cache not full: store the packet in it */
p_cache->data.p_stack[ p_cache->data.l_index ++ ] = p_data;
/* Small buffer or large buffer? */
if ( p_data->l_size < MAX_SMALL_SIZE )
{
/* Checks whether the small buffer cache is full */
if ( p_cache->small.l_index < SMALL_CACHE_SIZE )
{
p_cache->small.p_stack[ p_cache->small.l_index ].l_size =
p_data->l_size;
p_cache->small.p_stack[ p_cache->small.l_index ++ ].p_data =
p_data->p_buffer;
}
else
{
ASSERT( p_data->p_buffer );
free( p_data->p_buffer );
#ifdef TRACE_INPUT
intf_DbgMsg( "PS input: small buffer freed" );
#endif
}
}
else
{
/* Checks whether the large buffer cache is full */
if ( p_cache->large.l_index < LARGE_CACHE_SIZE )
{
p_cache->large.p_stack[ p_cache->large.l_index ].l_size =
p_data->l_size;
p_cache->large.p_stack[ p_cache->large.l_index ++ ].p_data =
p_data->p_buffer;
}
else
{
ASSERT( p_data->p_buffer );
free( p_data->p_buffer );
#ifdef TRACE_INPUT
intf_DbgMsg( "PS input: large buffer freed" );
#endif
}
}
}
else
{
/* Cache full: the packet must be freed */
free( p_data->p_buffer );
free( p_data );
#ifdef TRACE_INPUT
intf_DbgMsg( "PS input: data packet freed" );
#endif
}
vlc_mutex_unlock( &p_cache->lock );
}
/*****************************************************************************
* DeletePES: deletes a PES packet and associated data packets
*****************************************************************************/
static void DeletePES( void * p_packet_cache, pes_packet_t * p_pes )
{
packet_cache_t * p_cache;
data_packet_t * p_data;
data_packet_t * p_next;
p_cache = (packet_cache_t *)p_packet_cache;
#ifdef DEBUG
if ( p_cache == NULL )
{
intf_ErrMsg( "Packet cache not initialized" );
return;
}
#endif
ASSERT( p_pes);
p_data = p_pes->p_first;
while( p_data != NULL )
{
p_next = p_data->p_next;
DeletePacket( p_cache, p_data );
p_data = p_next;
}
vlc_mutex_lock( &p_cache->lock );
/* Checks whether the PES cache is full */
if ( p_cache->pes.l_index < PES_CACHE_SIZE )
{
/* Cache not full: store the packet in it */
p_cache->pes.p_stack[ p_cache->pes.l_index ++ ] = p_pes;
}
else
{
/* Cache full: the packet must be freed */
free( p_pes );
#ifdef TRACE_INPUT
intf_DbgMsg( "PS input: PES packet freed" );
#endif
}
vlc_mutex_unlock( &p_cache->lock );
}