bda.c

vlc源码

    const char* psz_module  = "dvb";
    const int   i_param_count = 19;
    const char* psz_param[] = { "frequency", "bandwidth",
        "srate", "azimuth", "elevation", "longitude", "polarisation",
        "modulation", "caching", "lnb-lof1", "lnb-lof2", "lnb-slof",
        "inversion", "network-id", "code-rate-hp", "code-rate-lp",
        "guard", "transmission", "hierarchy" };

    const int   i_type[] = { VLC_VAR_INTEGER, VLC_VAR_INTEGER,
        VLC_VAR_INTEGER, VLC_VAR_INTEGER, VLC_VAR_INTEGER, VLC_VAR_INTEGER,
        VLC_VAR_STRING, VLC_VAR_INTEGER, VLC_VAR_INTEGER, VLC_VAR_INTEGER,
        VLC_VAR_INTEGER, VLC_VAR_INTEGER, VLC_VAR_INTEGER, VLC_VAR_INTEGER,
        VLC_VAR_INTEGER, VLC_VAR_INTEGER, VLC_VAR_INTEGER, VLC_VAR_INTEGER,
        VLC_VAR_INTEGER };

    char  psz_full_name[128];
    int i_ret;

   /* Only if selected */
    if( *p_access->psz_access == '\0' )
        return VLC_EGENERIC;

    /* Setup Access */
    p_access->pf_read = NULL;
    p_access->pf_block = Block;     /* Function to read compressed data */
    p_access->pf_control = Control; /* Function to control the module */
    p_access->pf_seek = NULL;
    p_access->info.i_update = 0;
    p_access->info.i_size = 0;
    p_access->info.i_pos = 0;
    p_access->info.b_eof = false;
    p_access->info.i_title = 0;
    p_access->info.i_seekpoint = 0;
    p_access->p_sys = p_sys = (access_sys_t *)malloc( sizeof( access_sys_t ) );
    if( !p_sys )
        return VLC_ENOMEM;

    memset( p_sys, 0, sizeof( access_sys_t ) );

    for( int i = 0; i < i_param_count; i++ )
    {
        snprintf( psz_full_name, 128, "%s-%s\0", psz_module,
                  psz_param[i] );
        var_Create( p_access, psz_full_name, i_type[i] | VLC_VAR_DOINHERIT );
    }

    /* Parse the command line */
    if( ParsePath( p_access, psz_module, i_param_count, psz_param, i_type ) )
    {
        free( p_sys );
        return VLC_EGENERIC;
    }

    /* Build directshow graph */
    dvb_newBDAGraph( p_access );

    i_ret = VLC_EGENERIC;

    if( strncmp( p_access->psz_access, "qpsk", 4 ) == 0 ||
        strncmp( p_access->psz_access, "dvb-s", 5 ) == 0 ||
        strncmp( p_access->psz_access, "dvbs", 4 ) == 0 ||
        strncmp( p_access->psz_access, "satellite", 9 ) == 0 )
    {
        i_ret = dvb_SubmitDVBSTuneRequest( p_access );
    }
    if( strncmp( p_access->psz_access, "cable", 5 ) == 0 ||
        strncmp( p_access->psz_access, "dvb-c", 5 ) == 0  ||
        strncmp( p_access->psz_access, "dvbc", 4 ) == 0  ||
        strncmp( p_access->psz_access, "qam", 3 ) == 0 )
    {
        i_ret = dvb_SubmitDVBCTuneRequest( p_access );
    }
    if( strncmp( p_access->psz_access, "terrestrial", 11 ) == 0 ||
        strncmp( p_access->psz_access, "dvb-t", 5 ) == 0 ||
        strncmp( p_access->psz_access, "ofdm", 4 ) == 0 ||
        strncmp( p_access->psz_access, "dvbt", 4 ) == 0 )
    {
        i_ret = dvb_SubmitDVBTTuneRequest( p_access );
    }
    if( strncmp( p_access->psz_access, "usdigital", 9 ) == 0 ||
        strncmp( p_access->psz_access, "atsc", 4 ) == 0 )
    {
        i_ret = dvb_SubmitATSCTuneRequest( p_access );
    }

    if( i_ret != VLC_SUCCESS )
        msg_Warn( p_access, "DVB_Open: Unsupported Network %s",
            p_access->psz_access);
    return i_ret;
}

/*****************************************************************************
 * ParsePath:
 * Parses the path passed to VLC treating it as a MRL which
 * is organized as a sequence of <key>=<value> pairs separated by a colon
 * e.g. :key1=value1:key2=value2:key3=value3.
 * Each <key> is matched to one of the parameters passed in psz_param using
 * whatever characters are provided. e.g. fr = fre = frequency
 *****************************************************************************/
static int ParsePath( access_t *p_access, const char* psz_module,
    const int i_param_count, const char** psz_param, const int* i_type )
{
    const int   MAXPARAM = 20;
    BOOL        b_used[MAXPARAM];
    char*       psz_parser;
    char*       psz_token;
    char*       psz_value;
    vlc_value_t v_value;
    size_t      i_token_len, i_param_len;
    int         i_this_param;
    char        psz_full_name[128];

    if( i_param_count > MAXPARAM )
    {
        msg_Warn( p_access, "ParsePath: Too many parameters: %d > %d",
            i_param_count, MAXPARAM );
            return VLC_EGENERIC;
    }
    for( int i = 0; i < i_param_count; i++ )
        b_used[i] = FALSE;
    psz_parser = p_access->psz_path;
    if( strlen( psz_parser ) <= 0 )
        return VLC_SUCCESS;

    i_token_len = strcspn( psz_parser, ":" );
    if( i_token_len <= 0 )
        i_token_len  = strcspn( ++psz_parser, ":" );
 
    do
    {
        psz_token = strndup( psz_parser, i_token_len );
        i_param_len  = strcspn( psz_token, "=" );
        if( i_param_len <= 0 )
        {
            msg_Warn( p_access, "ParsePath: Unspecified parameter %s",
                psz_token );
            if( psz_token )
                free( psz_token );
            return VLC_EGENERIC;
        }
        i_this_param = -1;
        for( int i = 0; i < i_param_count; i++ )
        {
            if( strncmp( psz_token, psz_param[i], i_param_len ) == 0 )
            {
                i_this_param = i;
                break;
            }
        }
        if( i_this_param < 0 )
        {
            msg_Warn( p_access, "ParsePath: Unknown parameter %s", psz_token );
            if( psz_token )
                free( psz_token );
            return VLC_EGENERIC;
        }
        if( b_used[i_this_param] )
        {
            msg_Warn( p_access, "ParsePath: Duplicate parameter %s",
                psz_token );
            if( psz_token )
                free( psz_token );
            return VLC_EGENERIC;
        }
        b_used[i_this_param] = TRUE;

        /* if "=" was found in token then value starts at
         * psz_token + i_paramlen + 1
         * else there is no value specified so we use an empty string */
        psz_value = psz_token + i_param_len + 1;
        if( i_param_len >= i_token_len )
            psz_value--;
        if( i_type[i_this_param] == VLC_VAR_STRING )
             v_value.psz_string = strdup( psz_value );
        if( i_type[i_this_param] == VLC_VAR_INTEGER )
             v_value.i_int = atol( psz_value );
        snprintf( psz_full_name, 128, "%s-%s\0", psz_module,
            psz_param[i_this_param] );
        var_Set( p_access, psz_full_name, v_value );

        if( psz_token )
            free( psz_token );
        if( i_token_len >= strlen( psz_parser ) )
            break;
        psz_parser += i_token_len + 1;
        i_token_len = strcspn( psz_parser, ":" );
    }
    while( TRUE );
    return VLC_SUCCESS;
}

/*****************************************************************************
 * AccessClose: close device
 *****************************************************************************/
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;

    dvb_deleteBDAGraph( p_access );

    vlc_mutex_destroy( &p_sys->lock );
    vlc_cond_destroy( &p_sys->wait );

    free( p_sys );
}

/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( access_t *p_access, int i_query, va_list args )
{
    bool   *pb_bool, b_bool;
    int          *pi_int, i_int;
    int64_t      *pi_64;

    switch( i_query )
    {
    case ACCESS_CAN_SEEK:           /* 0 */
    case ACCESS_CAN_FASTSEEK:       /* 1 */
    case ACCESS_CAN_PAUSE:          /* 2 */
    case ACCESS_CAN_CONTROL_PACE:   /* 3 */
        pb_bool = (bool*)va_arg( args, bool* );
        *pb_bool = false;
        break;
    case ACCESS_GET_MTU:            /* 4 */
        pi_int = (int*)va_arg( args, int * );
        *pi_int = 0;
        break;
    case ACCESS_GET_PTS_DELAY:      /* 5 */
        pi_64 = (int64_t*)va_arg( args, int64_t * );
        *pi_64 = var_GetInteger( p_access, "dvb-caching" ) * 1000;
        break;
        /* */
    case ACCESS_GET_TITLE_INFO:     /* 6 */
    case ACCESS_GET_META:           /* 7 */
    case ACCESS_SET_PAUSE_STATE:    /* 8 */
    case ACCESS_SET_TITLE:          /* 9 */
    case ACCESS_SET_SEEKPOINT:      /* 10 */
    case ACCESS_GET_CONTENT_TYPE:
        return VLC_EGENERIC;

    case ACCESS_SET_PRIVATE_ID_STATE: /* 11 */
        i_int  = (int)va_arg( args, int );
        b_bool = (bool)va_arg( args, int );
        break;
    case ACCESS_SET_PRIVATE_ID_CA:  /* 12 -From Demux */
        break;
    default:
        msg_Warn( p_access,
                  "DVB_Control: Unimplemented query in control %d", i_query );
        return VLC_EGENERIC;
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Block:
 *****************************************************************************/
static block_t *Block( access_t *p_access )
{
    block_t *p_block;
    long l_buffer_len;

    if( !vlc_object_alive (p_access) )
        return NULL;

    l_buffer_len = dvb_GetBufferSize( p_access );
    if( l_buffer_len < 0 )
    {
        p_access->info.b_eof = true;
        return NULL;
    }

    p_block = block_New( p_access, l_buffer_len );
    if( dvb_ReadBuffer( p_access, &l_buffer_len, p_block->p_buffer ) < 0 )
    {
        p_access->info.b_eof = true;
        return NULL;
    }

    return p_block;
}