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vlc/plugins/vcd/input_vcd.c

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/****************************************************************************
* input_vcd.c: VideoCD raw reading plugin.
*****************************************************************************
* Copyright (C) 1998-2001 VideoLAN
*
* Author: Johan Bilien <jobi@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 <stdio.h>
#include <stdlib.h>
#include <videolan/vlc.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <fcntl.h>
#include <sys/types.h>
#include <string.h>
#include <errno.h>
#ifdef STRNCASECMP_IN_STRINGS_H
# include <strings.h>
#endif
#if defined( WIN32 )
# include <io.h> /* read() */
#else
# include <sys/uio.h> /* struct iovec */
#endif
#if defined( WIN32 )
# include "input_iovec.h"
#endif
#include "stream_control.h"
#include "input_ext-intf.h"
#include "input_ext-dec.h"
#include "input_ext-plugins.h"
#include "debug.h"
#include "input_vcd.h"
#include "linux_cdrom_tools.h"
/* how many blocks VCDRead will read in each loop */
#define VCD_BLOCKS_ONCE 4
#define VCD_DATA_ONCE (2 * VCD_BLOCKS_ONCE)
#define BUFFER_SIZE VCD_DATA_SIZE
/*****************************************************************************
* Local prototypes
*****************************************************************************/
/* called from outside */
static int VCDProbe ( struct input_thread_s * );
static void VCDInit ( struct input_thread_s * );
static int VCDRead ( struct input_thread_s *, data_packet_t ** );
static int VCDSetArea ( struct input_thread_s *, struct input_area_s * );
static int VCDSetProgram ( struct input_thread_s *, pgrm_descriptor_t * );
static void VCDOpen ( struct input_thread_s *);
static void VCDClose ( struct input_thread_s *);
static void VCDEnd ( struct input_thread_s *);
static void VCDSeek ( struct input_thread_s *, off_t );
static int VCDRewind ( struct input_thread_s * );
/*****************************************************************************
* Declare a buffer manager
*****************************************************************************/
#define FLAGS BUFFERS_NOFLAGS
#define NB_LIFO 2
DECLARE_BUFFERS_EMBEDDED( FLAGS, NB_LIFO );
DECLARE_BUFFERS_INIT( FLAGS, NB_LIFO );
DECLARE_BUFFERS_END( FLAGS, NB_LIFO );
DECLARE_BUFFERS_NEWPACKET( FLAGS, NB_LIFO );
DECLARE_BUFFERS_DELETEPACKET( FLAGS, NB_LIFO, 1000 );
DECLARE_BUFFERS_NEWPES( FLAGS, NB_LIFO );
DECLARE_BUFFERS_DELETEPES( FLAGS, NB_LIFO, 1000 );
/*****************************************************************************
* 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
input.pf_probe = VCDProbe;
input.pf_init = VCDInit;
input.pf_open = VCDOpen;
input.pf_close = VCDClose;
input.pf_end = VCDEnd;
input.pf_init_bit_stream = InitBitstream;
input.pf_read = VCDRead;
input.pf_set_area = VCDSetArea;
input.pf_set_program = VCDSetProgram;
input.pf_demux = input_DemuxPS;
input.pf_new_packet = input_NewPacket;
input.pf_new_pes = input_NewPES;
input.pf_delete_packet = input_DeletePacket;
input.pf_delete_pes = input_DeletePES;
input.pf_rewind = VCDRewind;
input.pf_seek = VCDSeek;
#undef input
}
/*
* Data reading functions
*/
/*****************************************************************************
* VCDProbe: verifies that the stream is a PS stream
*****************************************************************************/
static int VCDProbe( input_thread_t * p_input )
{
char * psz_name = p_input->p_source;
if( ( strlen(psz_name) > 4 ) && !strncasecmp( psz_name, "vcd:", 4 ) )
{
/* If the user specified "vcd:" then it's probably a VCD */
return 0;
}
return -1;
}
/*****************************************************************************
* VCDOpen: open vcd
*****************************************************************************/
static void VCDOpen( struct input_thread_s *p_input )
{
vlc_mutex_lock( &p_input->stream.stream_lock );
/* If we are here we can control the pace... */
p_input->stream.b_pace_control = 1;
p_input->stream.b_seekable = 1;
p_input->stream.p_selected_area->i_size = 0;
p_input->stream.p_selected_area->i_tell = 0;
vlc_mutex_unlock( &p_input->stream.stream_lock );
/* XXX: put this shit in an access plugin */
if( strlen( p_input->p_source ) > 4
&& !strncasecmp( p_input->p_source, "vcd:", 4 ) )
{
p_input->i_handle
= open( p_input->p_source + 4, O_RDONLY | O_NONBLOCK );
}
else
{
p_input->i_handle
= open( p_input->p_source, O_RDONLY | O_NONBLOCK );
}
if( p_input->i_handle == -1 )
{
p_input->b_error = 1;
}
}
/*****************************************************************************
* VCDClose: close vcd
*****************************************************************************/
static void VCDClose( struct input_thread_s *p_input )
{
close( p_input->i_handle );
}
/*****************************************************************************
* VCDInit: initializes VCD structures
*****************************************************************************/
static void VCDInit( input_thread_t * p_input )
{
thread_vcd_data_t * p_vcd;
int i_title;
int i_chapter;
int i;
input_area_t * p_area;
es_descriptor_t * p_es;
p_vcd = malloc( sizeof(thread_vcd_data_t) );
if( p_vcd == NULL )
{
intf_ErrMsg( "vcd error: out of memory" );
p_input->b_error = 1;
return;
}
p_input->p_plugin_data = (void *)p_vcd;
if( (p_input->p_method_data = input_BuffersInit()) == NULL )
{
free( p_vcd );
p_input->b_error = 1;
return;
}
p_vcd->i_handle = p_input->i_handle;
/* We read the Table Of Content information */
p_vcd->nb_tracks = ioctl_GetTrackCount( p_input->i_handle );
if( p_vcd->nb_tracks < 0 )
{
input_BuffersEnd( p_input->p_method_data );
free( p_vcd );
p_input->b_error = 1;
return;
}
else if( p_vcd->nb_tracks <= 1 )
{
intf_ErrMsg( "input error: no movie tracks found" );
input_BuffersEnd( p_input->p_method_data );
free( p_vcd );
p_input->b_error = 1;
return;
}
p_vcd->p_sectors = ioctl_GetSectors( p_input->i_handle );
if ( p_vcd->p_sectors == NULL )
{
input_BuffersEnd( p_input->p_method_data );
free( p_vcd );
p_input->b_error = 1;
return;
}
/* Set stream and area data */
vlc_mutex_lock( &p_input->stream.stream_lock );
/* Initialize ES structures */
input_InitStream( p_input, sizeof( stream_ps_data_t ) );
/* disc input method */
p_input->stream.i_method = INPUT_METHOD_VCD;
#define area p_input->stream.pp_areas
for( i = 1 ; i <= p_vcd->nb_tracks - 1 ; i++ )
{
input_AddArea( p_input );
/* Titles are Program Chains */
area[i]->i_id = i;
/* Absolute start offset and size */
area[i]->i_start = (off_t)p_vcd->p_sectors[i] * (off_t)VCD_DATA_SIZE;
area[i]->i_size = (off_t)(p_vcd->p_sectors[i+1] - p_vcd->p_sectors[i])
* (off_t)VCD_DATA_SIZE;
/* Number of chapters */
area[i]->i_part_nb = 0; // will be the entry points
area[i]->i_part = 1;
/* Number of angles */
area[i]->i_angle_nb = 1; // no angle support in VCDs
area[i]->i_angle = 1;
area[i]->i_plugin_data = p_vcd->p_sectors[i];
}
#undef area
/* Get requested title - if none try the first title */
i_title = main_GetIntVariable( INPUT_TITLE_VAR, 1 );
if( i_title <= 0 )
{
i_title = 1;
}
// p_vcd->i_track = i_title-1;
/* Get requested chapter - if none defaults to first one */
i_chapter = main_GetIntVariable( INPUT_CHAPTER_VAR, 1 );
if( i_chapter <= 0 )
{
i_chapter = 1;
}
p_input->stream.pp_areas[i_title]->i_part = i_chapter;
p_area = p_input->stream.pp_areas[i_title];
VCDSetArea( p_input, p_area );
/* Set program information. */
input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
/* No PSM to read in disc mode, we already have all the information */
p_input->stream.p_selected_program->b_is_ok = 1;
p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xe0, 0 );
p_es->i_stream_id = 0xe0;
p_es->i_type = MPEG1_VIDEO_ES;
p_es->i_cat = VIDEO_ES;
if( p_main->b_video )
{
input_SelectES( p_input, p_es );
}
p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xc0, 0 );
p_es->i_stream_id = 0xc0;
p_es->i_type = MPEG1_AUDIO_ES;
p_es->b_audio = 1;
p_es->i_cat = AUDIO_ES;
if( p_main->b_audio )
{
input_SelectES( p_input, p_es );
}
vlc_mutex_unlock( &p_input->stream.stream_lock );
}
/*****************************************************************************
* VCDEnd: frees unused data
*****************************************************************************/
static void VCDEnd( input_thread_t * p_input )
{
thread_vcd_data_t * p_vcd;
input_BuffersEnd( p_input->p_method_data );
p_vcd = (thread_vcd_data_t*)p_input->p_plugin_data;
free( p_vcd );
}
/*****************************************************************************
* VCDSetProgram: Does nothing since a VCD is mono_program
*****************************************************************************/
static int VCDSetProgram( input_thread_t * p_input,
pgrm_descriptor_t * p_program)
{
return 0;
}
/*****************************************************************************
* VCDSetArea: initialize input data for title x, chapter y.
* It should be called for each user navigation request.
****************************************************************************/
static int VCDSetArea( input_thread_t * p_input, input_area_t * p_area )
{
thread_vcd_data_t * p_vcd;
p_vcd = (thread_vcd_data_t*)p_input->p_plugin_data;
/* we can't use the interface slider until initilization is complete */
p_input->stream.b_seekable = 0;
if( p_area != p_input->stream.p_selected_area )
{
/* Reset the Chapter position of the current title */
p_input->stream.p_selected_area->i_part = 1;
p_input->stream.p_selected_area->i_tell = 0;
/* Change the default area */
p_input->stream.p_selected_area = p_area;
/* Change the current track */
/* The first track is not a valid one */
p_vcd->i_track = p_area->i_id;
p_vcd->i_sector = p_vcd->p_sectors[p_vcd->i_track];
}
/* warn interface that something has changed */
p_input->stream.b_seekable = 1;
p_input->stream.b_changed = 1;
return 0;
}
/*****************************************************************************
* VCDRead: reads from the VCD into PES packets.
*****************************************************************************
* Returns -1 in case of error, 0 in case of EOF, otherwise the number of
* packets.
*****************************************************************************/
static int VCDRead( input_thread_t * p_input, data_packet_t ** pp_data )
{
thread_vcd_data_t * p_vcd;
data_packet_t * p_data;
int i_packet_size;
int i_index;
int i_packet;
u32 i_header;
byte_t p_buffer[ VCD_DATA_SIZE ];
boolean_t b_eot = 0; /* end of track */
/* boolean_t b_eoc; No chapters yet */
p_vcd = (thread_vcd_data_t *)p_input->p_plugin_data;
i_packet = 0;
*pp_data = NULL;
while( i_packet < VCD_DATA_ONCE )
{
if( ioctl_ReadSector( p_vcd->i_handle, p_vcd->i_sector, p_buffer ) )
{
/* Read error, but assume we reached the end of the track */
b_eot = 1;
break;
}
p_vcd->i_sector++;
if( p_vcd->i_sector >= p_vcd->p_sectors[p_vcd->i_track + 1] )
{
b_eot = 1;
break;
}
i_index = 0;
while( i_index < BUFFER_SIZE-6 && i_packet < VCD_DATA_ONCE )
{
i_header = U32_AT(p_buffer + i_index);
/* 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. */
while( !i_header && (++i_index < BUFFER_SIZE - 4) )
{
i_header = U32_AT(p_buffer + i_index);
}
if( !i_header )
{
intf_WarnMsg( 12, "vcd warning: zero-padded packet" );
break;
}
/* Read the stream until we find a startcode. */
while( (i_header & 0xFFFFFF00) != 0x100L
&& (++i_index < BUFFER_SIZE - 4) )
{
i_header = U32_AT(p_buffer + i_index);
}
if( (i_header & 0xFFFFFF00) != 0x100L )
{
intf_WarnMsg( 3, "vcd warning: no packet at sector %d",
p_vcd->i_sector - 1 );
break; /* go to the next sector */
}
switch( i_header )
{
/* 0x1b9 == SYSTEM_END_CODE, it is only 4 bytes long. */
case 0x1b9:
i_packet_size = -2;
break;
/* Pack header */
case 0x1ba:
if( ( *( p_buffer + ( i_index + 4 ) ) & 0xC0) == 0x40 )
{
/* MPEG-2 */
i_packet_size = 8;
}
else if( (*(p_buffer + ( i_index + 4 ) ) & 0xF0) == 0x20 )
{
/* MPEG-1 */
i_packet_size = 6;
}
else
{
intf_ErrMsg( "vcd error: unable to determine "
"stream type" );
return( -1 );
}
break;
/* The packet is at least 6 bytes long. */
default:
/* That's the case for all packets, except pack header. */
i_packet_size = U16_AT((p_buffer + ( i_index + 4 )));
break;
}
if ( i_index + i_packet_size > BUFFER_SIZE )
{
intf_ErrMsg( "vcd error: packet too long (%i)",
i_index + i_packet_size );
continue;
}
/* Fetch a packet of the appropriate size. */
p_data = p_input->pf_new_packet( p_input->p_method_data,
i_packet_size + 6 );
if( p_data == NULL )
{
intf_ErrMsg( "vcd error: out of memory" );
return( -1 );
}
if( U32_AT(p_buffer) != 0x1B9 )
{
FAST_MEMCPY( p_data->p_demux_start, p_buffer + i_index,
6 + i_packet_size );
i_index += ( 6 + i_packet_size );
}
else
{
/* Copy the small header. */
memcpy( p_data->p_demux_start, p_buffer + i_index, 4 );
i_index += 4;
}
/* Give the packet to the other input stages. */
*pp_data = p_data;
pp_data = &p_data->p_next;
i_packet++;
}
}
vlc_mutex_lock( &p_input->stream.stream_lock );
p_input->stream.p_selected_area->i_tell =
(off_t)p_vcd->i_sector * (off_t)VCD_DATA_SIZE
- p_input->stream.p_selected_area->i_start;
/* no chapter for the moment*/
#if 0
if( b_eoc )
{
/* We modify i_part only at end of chapter not to erase
* some modification from the interface */
p_input->stream.p_selected_area->i_part = p_vcd->i_chapter;
}
#endif
if( b_eot )
{
input_area_t *p_area;
/* EOF ? */
if( p_vcd->i_track >= p_vcd->nb_tracks - 1 )
{
vlc_mutex_unlock( &p_input->stream.stream_lock );
return 0;
}
intf_WarnMsg( 4, "vcd info: new title" );
p_area = p_input->stream.pp_areas[
p_input->stream.p_selected_area->i_id + 1 ];
p_area->i_part = 1;
VCDSetArea( p_input, p_area );
}
vlc_mutex_unlock( &p_input->stream.stream_lock );
return( i_packet + 1 );
}
/*****************************************************************************
* VCDRewind : reads a stream backward
*****************************************************************************/
static int VCDRewind( input_thread_t * p_input )
{
return( -1 );
}
/****************************************************************************
* VCDSeek
****************************************************************************/
static void VCDSeek( input_thread_t * p_input, off_t i_off )
{
thread_vcd_data_t * p_vcd;
p_vcd = (thread_vcd_data_t *) p_input->p_plugin_data;
p_vcd->i_sector = p_vcd->p_sectors[p_vcd->i_track]
+ i_off / (off_t)VCD_DATA_SIZE;
p_input->stream.p_selected_area->i_tell =
(off_t)p_vcd->i_sector * (off_t)VCD_DATA_SIZE
- p_input->stream.p_selected_area->i_start;
}