mtp.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:10k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * mtp.c: mtp input (mtp: access plug-in)
- *****************************************************************************
- * Copyright (C) 2001-2006 the VideoLAN team
- * Copyright © 2006-2008 Rémi Denis-Courmont
- *
- * Authors: Fabio Ritrovato <exsephiroth87@gmail.com>
- * Original file.c: Christophe Massiot <massiot@via.ecp.fr>
- * Rémi Denis-Courmont <rem # videolan # org>
- *
- * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_plugin.h>
- #include <vlc_input.h>
- #include <vlc_access.h>
- #include <vlc_dialog.h>
- #include <assert.h>
- #include <errno.h>
- #ifdef HAVE_SYS_TYPES_H
- # include <sys/types.h>
- #endif
- #ifdef HAVE_SYS_STAT_H
- # include <sys/stat.h>
- #endif
- #ifdef HAVE_FCNTL_H
- # include <fcntl.h>
- #endif
- #include <unistd.h>
- #include <poll.h>
- #include <vlc_charset.h>
- #include "libmtp.h"
- /*****************************************************************************
- * Module descriptor
- *****************************************************************************/
- static int Open ( vlc_object_t * );
- static void Close( vlc_object_t * );
- #define CACHING_TEXT N_("Caching value in ms")
- #define CACHING_LONGTEXT N_(
- "Caching value for files. This "
- "value should be set in milliseconds." )
- vlc_module_begin()
- set_description( N_("MTP input") )
- set_shortname( N_("MTP") )
- set_category( CAT_INPUT )
- set_subcategory( SUBCAT_INPUT_ACCESS )
- set_capability( "access", 0 )
- add_shortcut( "mtp" )
- set_callbacks( Open, Close )
- vlc_module_end()
- /*****************************************************************************
- * Exported prototypes
- *****************************************************************************/
- static int Seek( access_t *, int64_t );
- static ssize_t Read( access_t *, uint8_t *, size_t );
- static int Control( access_t *, int, va_list );
- static int open_file( access_t *, const char * );
- struct access_sys_t
- {
- unsigned int i_nb_reads;
- int fd;
- };
- /*****************************************************************************
- * Open: open the file
- *****************************************************************************/
- static int Open( vlc_object_t *p_this )
- {
- access_t *p_access = ( access_t* )p_this;
- access_sys_t *p_sys;
- uint32_t i_bus;
- uint8_t i_dev;
- uint16_t i_product_id;
- int i_track_id;
- LIBMTP_raw_device_t *p_rawdevices;
- LIBMTP_mtpdevice_t *p_device;
- int i_numrawdevices;
- int i_ret;
- /* Update default_pts to a suitable value for file access */
- var_Create( p_access, "file-caching", VLC_VAR_INTEGER|VLC_VAR_DOINHERIT );
- if( sscanf( p_access->psz_path, "%"SCNu32":%"SCNu8":%"SCNu16":%d", &i_bus,
- &i_dev, &i_product_id, &i_track_id ) != 4 )
- return VLC_EGENERIC;
- i_ret = LIBMTP_Detect_Raw_Devices( &p_rawdevices, &i_numrawdevices );
- if( i_ret != 0 || i_numrawdevices <= 0 || !p_rawdevices )
- return VLC_EGENERIC;
- for( int i = 0; i < i_numrawdevices; i++ )
- {
- if( i_bus == p_rawdevices[i].bus_location &&
- i_dev == p_rawdevices[i].devnum &&
- i_product_id == p_rawdevices[i].device_entry.product_id )
- {
- if( ( p_device = LIBMTP_Open_Raw_Device( &p_rawdevices[i] )
- ) != NULL )
- {
- free( p_access->psz_path );
- if( ( p_access->psz_path = tempnam( NULL, "vlc" ) ) == NULL )
- {
- LIBMTP_Release_Device( p_device );
- free( p_rawdevices );
- return VLC_ENOMEM;
- }
- else
- {
- msg_Dbg( p_access, "About to write %s", p_access->psz_path );
- LIBMTP_Get_File_To_File( p_device, i_track_id,
- p_access->psz_path, NULL, NULL );
- LIBMTP_Release_Device( p_device );
- i = i_numrawdevices;
- }
- }
- else
- {
- free( p_rawdevices );
- return VLC_EGENERIC;
- }
- }
- }
- free( p_rawdevices );
- STANDARD_READ_ACCESS_INIT;
- p_sys->i_nb_reads = 0;
- int fd = p_sys->fd = -1;
- /* Open file */
- msg_Dbg( p_access, "opening file `%s'", p_access->psz_path );
- fd = open_file( p_access, p_access->psz_path );
- if( fd == -1 )
- {
- free( p_sys );
- return VLC_EGENERIC;
- }
- p_sys->fd = fd;
- #ifdef HAVE_SYS_STAT_H
- struct stat st;
- if( fstat( fd, &st ) )
- msg_Err( p_access, "fstat(%d): %m", fd );
- p_access->info.i_size = st.st_size;
- #else
- # warning File size not known!
- #endif
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * Close: close the target
- *****************************************************************************/
- static void Close( vlc_object_t * p_this )
- {
- access_t *p_access = ( access_t* )p_this;
- access_sys_t *p_sys = p_access->p_sys;
- close ( p_sys->fd );
- if( utf8_unlink( p_access->psz_path ) != 0 )
- msg_Err( p_access, "Error deleting file %s, %m", p_access->psz_path );
- free( p_sys );
- }
- /*****************************************************************************
- * Read: standard read on a file descriptor.
- *****************************************************************************/
- static ssize_t Read( access_t *p_access, uint8_t *p_buffer, size_t i_len )
- {
- access_sys_t *p_sys = p_access->p_sys;
- ssize_t i_ret;
- int fd = p_sys->fd;
- i_ret = read( fd, p_buffer, i_len );
- if( i_ret < 0 )
- {
- switch( errno )
- {
- case EINTR:
- case EAGAIN:
- break;
- default:
- msg_Err( p_access, "read failed (%m)" );
- dialog_Fatal( p_access, _( "File reading failed" ), "%s",
- _( "VLC could not read the file." ) );
- p_access->info.b_eof = true;
- return 0;
- }
- }
- else if( i_ret > 0 )
- p_access->info.i_pos += i_ret;
- else
- p_access->info.b_eof = true;
- p_sys->i_nb_reads++;
- return i_ret;
- }
- /*****************************************************************************
- * Seek: seek to a specific location in a file
- *****************************************************************************/
- static int Seek( access_t *p_access, int64_t i_pos )
- {
- p_access->info.i_pos = i_pos;
- p_access->info.b_eof = false;
- lseek( p_access->p_sys->fd, i_pos, SEEK_SET );
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * Control:
- *****************************************************************************/
- static int Control( access_t *p_access, int i_query, va_list args )
- {
- bool *pb_bool;
- int64_t *pi_64;
- switch( i_query )
- {
- /* */
- case ACCESS_CAN_SEEK:
- case ACCESS_CAN_FASTSEEK:
- pb_bool = ( bool* )va_arg( args, bool* );
- *pb_bool = true;
- break;
- case ACCESS_CAN_PAUSE:
- case ACCESS_CAN_CONTROL_PACE:
- pb_bool = ( bool* )va_arg( args, bool* );
- *pb_bool = true;
- break;
- case ACCESS_GET_PTS_DELAY:
- pi_64 = ( int64_t* )va_arg( args, int64_t * );
- *pi_64 = var_GetInteger( p_access, "file-caching" ) * INT64_C( 1000 );
- break;
- /* */
- case ACCESS_SET_PAUSE_STATE:
- /* Nothing to do */
- break;
- case ACCESS_GET_TITLE_INFO:
- case ACCESS_SET_TITLE:
- case ACCESS_SET_SEEKPOINT:
- case ACCESS_SET_PRIVATE_ID_STATE:
- case ACCESS_GET_META:
- case ACCESS_GET_PRIVATE_ID_STATE:
- case ACCESS_GET_CONTENT_TYPE:
- return VLC_EGENERIC;
- default:
- msg_Warn( p_access, "unimplemented query %d in control", i_query );
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * open_file: Opens a specific file
- *****************************************************************************/
- static int open_file( access_t *p_access, const char *path )
- {
- int fd = utf8_open( path, O_RDONLY | O_NONBLOCK /* O_LARGEFILE*/, 0666 );
- if( fd == -1 )
- {
- msg_Err( p_access, "cannot open file %s (%m)", path );
- dialog_Fatal( p_access, _( "File reading failed" ),
- _( "VLC could not open the file "%s"." ), path );
- return -1;
- }
- #if defined( HAVE_FCNTL )
- fcntl( fd, F_SETFD, fcntl( fd, F_GETFD ) | FD_CLOEXEC );
- /* We'd rather use any available memory for reading ahead
- * than for caching what we've already seen/heard */
- # if defined( F_RDAHEAD )
- fcntl( fd, F_RDAHEAD, 1 );
- # endif
- # if defined( F_NOCACHE )
- fcntl( fd, F_NOCACHE, 1 );
- # endif
- #endif
- return fd;
- }