access.c

VLC媒体播放程序

                if( *psz_next )
                {
                    psz_parser = psz_next + 1;
                    u_srate = (unsigned int)strtol( psz_parser, &psz_next, 10 );
                }
            }
        }
    }
   
    /* Validating input values */
    if ( ((u_freq) > frontend_info.frequency_max) ||
         ((u_freq) < frontend_info.frequency_min) )
    {
        msg_Warn( p_input, "invalid frequency %d (KHz), using default one", u_freq );
        u_freq = config_GetInt( p_input, "frequency" );
        if ( ((u_freq) > frontend_info.frequency_max) ||
             ((u_freq) < frontend_info.frequency_min) )
        {
            msg_Err( p_input, "invalid default frequency" );
            return -1;
        }
    }

    /* Workaround for backwards compatibility */
    if (strncmp( p_input->psz_access, "satellite", 9 ) ==0)
    {
        msg_Warn( p_input, "invalid symbol rate %d possibly specified in MHz, trying value *1000 KHz", u_freq );
        u_srate *= 1000;
    }
    
    if ( ((u_srate) > frontend_info.symbol_rate_max) ||
         ((u_srate) < frontend_info.symbol_rate_min) )
    {
        msg_Warn( p_input, "invalid symbol rate, using default one" );
        u_srate = config_GetInt( p_input, "symbol-rate" );
        if ( ((u_srate) > frontend_info.symbol_rate_max) ||
             ((u_srate) < frontend_info.symbol_rate_min) )
        {
            msg_Err( p_input, "invalid default symbol rate" );
            return -1;
        }
    }

    if( (i_fec > 9) || (i_fec < 1) )
    {
        msg_Warn( p_input, "invalid FEC, using default one" );
        i_fec = config_GetInt( p_input, "fec" );
        if( (i_fec > 9) || (i_fec < 1) )
        {
            msg_Err( p_input, "invalid default FEC" );
            return -1;
        }
    }

    /* Setting frontend parameters for tuning the hardware */      
    msg_Dbg( p_input, "Trying to tune to channel ...");
    switch( frontend_info.type )
    {
        /* DVB-S: satellite and budget cards (nova) */
        case FE_QPSK:
            fep.frequency = u_freq; /* KHz */
            fep.inversion = dvb_DecodeInversion(p_input, i_polarisation);
            fep.u.qpsk.symbol_rate = u_srate;
            fep.u.qpsk.fec_inner = dvb_DecodeFEC(p_input, i_fec); 
            msg_Dbg( p_input, "DVB-S: satellite (QPSK) frontend %s found", frontend_info.name );

            if (ioctl_SetQPSKFrontend (p_input, fep, i_polarisation,
                               u_lnb_lof1, u_lnb_lof2, u_lnb_slof,
                               u_adapter, u_device )<0)
            {
                msg_Err( p_input, "DVB-S: tuning failed" );
                return -1;
            }
            break;
            
        /* DVB-C */
        case FE_QAM:
            fep.frequency = u_freq; /* KHz */
            fep.inversion = dvb_DecodeInversion(p_input, i_polarisation);
            fep.u.qam.symbol_rate = u_srate;
            fep.u.qam.fec_inner = dvb_DecodeFEC(p_input, i_fec); 
            fep.u.qam.modulation = dvb_DecodeModulation(p_input, i_modulation); 
            msg_Dbg( p_input, "DVB-C: cable (QAM) frontend %s found", frontend_info.name );
            if (ioctl_SetQAMFrontend (p_input, fep, u_adapter, u_device )<0)
            {
                msg_Err( p_input, "DVB-C: tuning failed" );
                return -1;
            }
            break;

        /* DVB-T */
        case FE_OFDM:
            fep.frequency = u_freq; /* KHz */
            fep.inversion = dvb_DecodeInversion(p_input, i_polarisation);
            fep.u.ofdm.bandwidth = dvb_DecodeBandwidth(p_input, i_bandwidth);
            fep.u.ofdm.code_rate_HP = dvb_DecodeFEC(p_input, i_code_rate_HP); 
            fep.u.ofdm.code_rate_LP = dvb_DecodeFEC(p_input, i_code_rate_LP);
            fep.u.ofdm.constellation = dvb_DecodeModulation(p_input, i_modulation); 
            fep.u.ofdm.transmission_mode = dvb_DecodeTransmission(p_input, i_transmission);
            fep.u.ofdm.guard_interval = dvb_DecodeGuardInterval(p_input, i_guard);
            fep.u.ofdm.hierarchy_information = dvb_DecodeHierarchy(p_input, i_hierarchy);
            msg_Dbg( p_input, "DVB-T: terrestrial (OFDM) frontend %s found", frontend_info.name );
            if (ioctl_SetOFDMFrontend (p_input, fep,u_adapter, u_device )<0)
            {
                msg_Err( p_input, "DVB-T: tuning failed" );
                return -1;
            }
            break;
        default:
            msg_Err( p_input, "Could not determine frontend type on %s", frontend_info.name );
            return -1;
    }
    msg_Dbg( p_input, "Tuning done.");

    /* Initialise structure */
    p_satellite = malloc( sizeof( input_socket_t ) );

    if( p_satellite == NULL )
    {
        msg_Err( p_input, "out of memory" );
        return -1;
    }

    p_input->p_access_data = (void *)p_satellite;

    /* Open the DVR device */
    i_len = sizeof(DVR);
    if (snprintf(dvr, sizeof(DVR), DVR, u_adapter, u_device) >= i_len)
    {
        msg_Err( p_input, "snprintf() truncated string for DVR" );
        dvr[sizeof(DVR)] = '\0';
    }
    msg_Dbg( p_input, "opening DVR device '%s'", dvr );

    if( (p_satellite->i_handle = open( dvr,
                                   /*O_NONBLOCK | O_LARGEFILE*/0 )) == (-1) )
    {
#   ifdef HAVE_ERRNO_H
        msg_Warn( p_input, "cannot open `%s' (%s)", dvr, strerror(errno) );
#   else
        msg_Warn( p_input, "cannot open `%s'", dvr );
#   endif
        free( p_satellite );
        return -1;
    }

    msg_Dbg( p_input, "setting filter on PAT" );

    /* Set Filter on PAT packet */
    if ( ioctl_SetDMXFilter(p_input, 0, &i_fd, 21, u_adapter, u_device ) < 0 )
    {
#   ifdef HAVE_ERRNO_H
        msg_Err( p_input, "an error occured when setting filter on PAT (%s)", strerror(errno) );
#   else
        msg_Err( p_input, "an error occured when setting filter on PAT" );
#   endif        
        close( p_satellite->i_handle );
        free( p_satellite );
        return -1;
    }

    if( input_InitStream( p_input, sizeof( stream_ts_data_t ) ) == -1 )
    {
        msg_Err( p_input, "could not initialize stream structure" );
        close( p_satellite->i_handle );
        free( p_satellite );
        return( -1 );
    }

    vlc_mutex_lock( &p_input->stream.stream_lock );

    p_input->stream.b_pace_control = 1;
    p_input->stream.b_seekable = 0;
    p_input->stream.p_selected_area->i_tell = 0;

    vlc_mutex_unlock( &p_input->stream.stream_lock );

    p_input->i_mtu = SATELLITE_READ_ONCE * TS_PACKET_SIZE;
    p_input->stream.i_method = INPUT_METHOD_SATELLITE;

    return 0;
}

/*****************************************************************************
 * Close : Close the device
 *****************************************************************************/
void E_(Close) ( vlc_object_t *p_this )
{
    input_thread_t *    p_input = (input_thread_t *)p_this;
    input_socket_t *    p_satellite;
    unsigned int        i_es_index;

    if ( p_input->stream.p_selected_program )
    {
        for ( i_es_index = 1 ;
                i_es_index < p_input->stream.p_selected_program->i_es_number;
                i_es_index ++ )
        {
#define p_es p_input->stream.p_selected_program->pp_es[i_es_index]
            if ( p_es->p_dec )
            {
                ioctl_UnsetDMXFilter(p_input, p_es->i_demux_fd );
            }
#undef p_es
        }
    }

    p_satellite = (input_socket_t *)p_input;
    close( p_satellite->i_handle );
}

/*****************************************************************************
 * SatelliteRead: reads data from the satellite card
 *****************************************************************************/
static ssize_t SatelliteRead( input_thread_t * p_input, byte_t * p_buffer,
                              size_t i_len )
{
    input_socket_t * p_access_data = (input_socket_t *)p_input->p_access_data;
    ssize_t i_ret;
    unsigned int u_adapter = 1;
    unsigned int u_device = 0;
    unsigned int i;

    // Get adapter and device number to use for this dvb card
    u_adapter = config_GetInt( p_input, "adapter" );
    u_device  = config_GetInt( p_input, "device" );

    /* if not set, set filters to the PMTs */
    for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
    {
        if ( p_input->stream.pp_programs[i]->pp_es[0]->i_demux_fd == 0 )
        {
            ioctl_SetDMXFilter(p_input, p_input->stream.pp_programs[i]->pp_es[0]->i_id,
                       &p_input->stream.pp_programs[i]->pp_es[0]->i_demux_fd,
                       21, u_adapter, u_device );
        }
    }

    i_ret = read( p_access_data->i_handle, p_buffer, i_len );
 
    if( i_ret < 0 )
    {
#   ifdef HAVE_ERRNO_H
        msg_Err( p_input, "read failed (%s)", strerror(errno) );
#   else
        msg_Err( p_input, "read failed" );
#   endif
    }

    return i_ret;
}

/*****************************************************************************
 * SatelliteSetArea : Does nothing
 *****************************************************************************/
static int SatelliteSetArea( input_thread_t * p_input, input_area_t * p_area )
{
    return -1;
}

/*****************************************************************************
 * SatelliteSetProgram : Sets the card filters according to the
 *                 selected program,
 *                 and makes the appropriate changes to stream structure.
 *****************************************************************************/
int SatelliteSetProgram( input_thread_t    * p_input,
                         pgrm_descriptor_t * p_new_prg )
{
    unsigned int i_es_index;
    vlc_value_t val;
    unsigned int u_adapter = 1;
    unsigned int u_device = 0;
    unsigned int u_video_type = 1; /* default video type */
    unsigned int u_audio_type = 2; /* default audio type */

    /* Get adapter and device number to use for this dvb card */
    u_adapter = config_GetInt( p_input, "adapter" );
    u_device  = config_GetInt( p_input, "device" );

    if ( p_input->stream.p_selected_program )
    {
        for ( i_es_index = 1 ; /* 0 should be the PMT */
                i_es_index < p_input->stream.p_selected_program->i_es_number ;
                i_es_index ++ )
        {
#define p_es p_input->stream.p_selected_program->pp_es[i_es_index]
            if ( p_es->p_dec )
            {
                input_UnselectES( p_input , p_es );
            }
            if ( p_es->i_demux_fd > 0)
            {
                ioctl_UnsetDMXFilter(p_input, p_es->i_demux_fd );
                p_es->i_demux_fd = 0;
            }
#undef p_es
        }
    }

    for (i_es_index = 1 ; i_es_index < p_new_prg->i_es_number ; i_es_index ++ )
    {
#define p_es p_new_prg->pp_es[i_es_index]
        switch( p_es->i_cat )
        {
            case MPEG1_VIDEO_ES:
            case MPEG2_VIDEO_ES:
            case MPEG2_MOTO_VIDEO_ES:
                if ( input_SelectES( p_input , p_es ) == 0 )
                {
                    ioctl_SetDMXFilter(p_input, p_es->i_id, &p_es->i_demux_fd, u_video_type,
                                       u_adapter, u_device);
                    u_video_type += 5;
                }
                break;
            case MPEG1_AUDIO_ES:
            case MPEG2_AUDIO_ES:
                if ( input_SelectES( p_input , p_es ) == 0 )
                {
                    ioctl_SetDMXFilter(p_input, p_es->i_id, &p_es->i_demux_fd, u_audio_type,
                                       u_adapter, u_device);
                    input_SelectES( p_input , p_es );
                    u_audio_type += 5;
                }
                break;
            default:
                ioctl_SetDMXFilter(p_input, p_es->i_id, &p_es->i_demux_fd, 21, u_adapter, u_device);
                input_SelectES( p_input , p_es );
                msg_Warn(p_input, "ES streamtype 0x%d found used as DMX_PES_OTHER !!",(int) p_es->i_cat);
                break;
#undef p_es
        }
    }

    p_input->stream.p_selected_program = p_new_prg;

    /* Update the navigation variables without triggering a callback */
    val.i_int = p_new_prg->i_number;
    var_Change( p_input, "program", VLC_VAR_SETVALUE, &val, NULL );

    return 0;
}

/*****************************************************************************
 * SatelliteSeek: does nothing (not a seekable stream
 *****************************************************************************/
static void SatelliteSeek( input_thread_t * p_input, off_t i_off )
{
    ;
}