file.c

uclinux 下的vlc播放器源代码

            psz_name = psz_parser;
            if( psz_name ) psz_name++;
        }
    }
    free( psz );

    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;
    int i;

    close( p_sys->fd );

    for( i = 0; i < p_sys->i_file; i++ )
    {
        free( p_sys->file[i]->psz_name );
        free( p_sys->file[i] );
    }
    free( p_sys->file );

    free( p_sys );
}

/*****************************************************************************
 * Read: standard read on a file descriptor.
 *****************************************************************************/
static int Read( access_t *p_access, uint8_t *p_buffer, int i_len )
{
    access_sys_t *p_sys = p_access->p_sys;
    int i_ret;

#if !defined(WIN32) && !defined(UNDER_CE)
    if( !p_sys->b_pace_control )
    {
        if( !p_sys->b_kfir )
        {
            /* Find if some data is available. This won't work under Windows. */
            do
            {
                struct pollfd ufd;

                if( p_access->b_die )
                    return 0;

                memset (&ufd, 0, sizeof (ufd));
                ufd.fd = p_sys->fd;
                ufd.events = POLLIN;

                i_ret = poll( &ufd, 1, 500 );
                if( i_ret == -1 )
                {
                    if( errno != EINTR )
                    {
                        msg_Err( p_access, "poll error: %s",
                                 strerror( errno ) );
                        return -1;
                    }
                    i_ret = 0;
                }
            }
            while( i_ret == 0 );

            i_ret = read( p_sys->fd, p_buffer, i_len );
        }
        else
        {
            /* b_kfir ; work around a buggy poll() driver implementation */
            while ( (i_ret = read( p_sys->fd, p_buffer, i_len )) == 0 &&
                    !p_access->b_die )
            {
                msleep( INPUT_ERROR_SLEEP );
            }
        }
    }
    else
#endif /* WIN32 || UNDER_CE */
    {
        /* b_pace_control || WIN32 */
        i_ret = read( p_sys->fd, p_buffer, i_len );
    }

    if( i_ret < 0 )
    {
        if( errno != EINTR && errno != EAGAIN )
            msg_Err( p_access, "read failed (%s)", strerror(errno) );

        /* Delay a bit to avoid consuming all the CPU. This is particularly
         * useful when reading from an unconnected FIFO. */
        msleep( INPUT_ERROR_SLEEP );
    }

    p_sys->i_nb_reads++;
#ifdef HAVE_SYS_STAT_H
    if( p_access->info.i_size != 0 &&
        (p_sys->i_nb_reads % INPUT_FSTAT_NB_READS) == 0 )
    {
        struct stat stat_info;
        int i_file = p_sys->i_index;

        if ( fstat( p_sys->fd, &stat_info ) == -1 )
        {
            msg_Warn( p_access, "couldn't stat again the file (%s)", strerror(errno) );
        }
        else if ( p_sys->file[i_file]->i_size != stat_info.st_size )
        {
            p_access->info.i_size += (stat_info.st_size - p_sys->file[i_file]->i_size );
            p_sys->file[i_file]->i_size = stat_info.st_size;
            p_access->info.i_update |= INPUT_UPDATE_SIZE;
        }
    }
#endif

    /* If we reached an EOF then switch to the next file in the list */
    if ( i_ret == 0 && p_sys->i_index + 1 < p_sys->i_file )
    {
        char *psz_name = p_sys->file[++p_sys->i_index]->psz_name;
        p_sys->fd_backup = p_sys->fd;

        msg_Dbg( p_access, "opening file `%s'", psz_name );

        if ( _OpenFile( p_access, psz_name ) )
        {
            p_sys->fd = p_sys->fd_backup;
            return 0;
        }

        close( p_sys->fd_backup );

        /* We have to read some data */
        return Read( p_access, p_buffer, i_len );
    }

    if( i_ret > 0 )
        p_access->info.i_pos += i_ret;
    else if( i_ret == 0 )
        p_access->info.b_eof = VLC_TRUE;

    return i_ret;
}

/*****************************************************************************
 * Seek: seek to a specific location in a file
 *****************************************************************************/
static int Seek( access_t *p_access, int64_t i_pos )
{
    access_sys_t *p_sys = p_access->p_sys;
    int64_t i_size = 0;

    /* Check which file we need to access */
    if( p_sys->i_file > 1 )
    {
        int i;
        char *psz_name;
        p_sys->fd_backup = p_sys->fd;

        for( i = 0; i < p_sys->i_file - 1; i++ )
        {
            if( i_pos < p_sys->file[i]->i_size + i_size )
                break;
            i_size += p_sys->file[i]->i_size;
        }
        psz_name = p_sys->file[i]->psz_name;

        msg_Dbg( p_access, "opening file `%s'", psz_name );

        if ( i != p_sys->i_index && !_OpenFile( p_access, psz_name ) )
        {
            /* Close old file */
            close( p_sys->fd_backup );
            p_sys->i_index = i;
        }
        else
        {
            p_sys->fd = p_sys->fd_backup;
        }
    }

    lseek( p_sys->fd, i_pos - i_size, SEEK_SET );

    p_access->info.i_pos = i_pos;
    if( p_access->info.i_size < p_access->info.i_pos )
    {
        msg_Err( p_access, "seeking too far" );
        p_access->info.i_pos = p_access->info.i_size;
    }
    else if( p_access->info.i_pos < 0 )
    {
        msg_Err( p_access, "seeking too early" );
        p_access->info.i_pos = 0;
    }
    /* Reset eof */
    p_access->info.b_eof = VLC_FALSE;

    /* FIXME */
    return VLC_SUCCESS;
}

/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( access_t *p_access, int i_query, va_list args )
{
    access_sys_t *p_sys = p_access->p_sys;
    vlc_bool_t   *pb_bool;
    int          *pi_int;
    int64_t      *pi_64;

    switch( i_query )
    {
        /* */
        case ACCESS_CAN_SEEK:
        case ACCESS_CAN_FASTSEEK:
            pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
            *pb_bool = p_sys->b_seekable;
            break;

        case ACCESS_CAN_PAUSE:
        case ACCESS_CAN_CONTROL_PACE:
            pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
            *pb_bool = p_sys->b_pace_control;
            break;

        /* */
        case ACCESS_GET_MTU:
            pi_int = (int*)va_arg( args, int * );
            *pi_int = 0;
            break;

        case ACCESS_GET_PTS_DELAY:
            pi_64 = (int64_t*)va_arg( args, int64_t * );
            *pi_64 = var_GetInteger( p_access, "file-caching" ) * I64C(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:
            return VLC_EGENERIC;

        default:
            msg_Warn( p_access, "unimplemented query in control" );
            return VLC_EGENERIC;

    }
    return VLC_SUCCESS;
}


/*****************************************************************************
 * OpenFile: Opens a specific file
 *****************************************************************************/
static int _OpenFile( access_t * p_access, const char * psz_name )
{
    access_sys_t *p_sys = p_access->p_sys;

#ifdef UNDER_CE
    p_sys->fd = utf8_fopen( psz_name, "rb" );
    if ( !p_sys->fd )
    {
        msg_Err( p_access, "cannot open file %s", psz_name );
        return VLC_EGENERIC;
    }

    fseek( p_sys->fd, 0, SEEK_END );
    p_access->info.i_size = ftell( p_sys->fd );
    p_access->info.i_update |= INPUT_UPDATE_SIZE;
    fseek( p_sys->fd, 0, SEEK_SET );
#else
#if defined (WIN32)

    if( GetVersion() < 0x80000000 )
    {
        /* for Windows NT and above */
        wchar_t wpath[MAX_PATH + 1];

        if( !MultiByteToWideChar( CP_UTF8, 0, psz_name, -1, wpath, MAX_PATH ) )
        {
            msg_Err( p_access, "incorrect file name %s", psz_name );
            return VLC_EGENERIC;
        }
        wpath[MAX_PATH] = L'\0';

        p_sys->fd = _wopen( wpath, O_NONBLOCK );
        goto opencont;
    }

#endif
    const char *psz_localname = ToLocale( psz_name );
    if( psz_localname == NULL )
    {
        msg_Err( p_access, "incorrect file name %s", psz_name );
        return VLC_EGENERIC;
    }

    p_sys->fd = open( psz_localname, O_NONBLOCK /*| O_LARGEFILE*/ );
    LocaleFree( psz_localname );

opencont:
    if ( p_sys->fd == -1 )
    {
        msg_Err( p_access, "cannot open file %s (%s)", psz_name,
                 strerror(errno) );
        return VLC_EGENERIC;
    }

#if defined(HAVE_FCNTL_H) && defined(F_FDAHEAD) && defined(F_NOCACHE)
    /* We'd rather use any available memory for reading ahead
     * than for caching what we've already seen/heard */
    fcntl(p_sys->fd, F_RDAHEAD, 1);
    fcntl(p_sys->fd, F_NOCACHE, 1);
#endif

#endif

    return VLC_SUCCESS;
}