/*****************************************************************************
 * access.c: DVB card input v4l2 only
 *****************************************************************************
 * Copyright (C) 1998-2010 VLC authors and VideoLAN
 *
 * Authors: Johan Bilien <jobi@via.ecp.fr>
 *          Jean-Paul Saman <jpsaman _at_ videolan _dot_ org>
 *          Christophe Massiot <massiot@via.ecp.fr>
 *          Laurent Aimar <fenrir@via.ecp.fr>
 *          David Kaplan <david@2of1.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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_access.h>
#include <vlc_input.h>
#include <vlc_interrupt.h>
#include <vlc_dialog.h>

#include <sys/types.h>
#include <poll.h>

#include <errno.h>

#include "dvb.h"
#include "scan.h"

struct access_sys_t
{
    demux_handle_t p_demux_handles[MAX_DEMUX];
    dvb_sys_t dvb;

    /* Scan */
    struct scan_t *scan;
    bool done;
};

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  Open( vlc_object_t *p_this );
static void Close( vlc_object_t *p_this );

#define PROBE_TEXT N_("Probe DVB card for capabilities")
#define PROBE_LONGTEXT N_("Some DVB cards do not like to be probed for their capabilities, you can disable this feature if you experience some trouble.")

/* Satellite */
#define SATELLITE_TEXT N_("Satellite scanning config")
#define SATELLITE_LONGTEXT N_("Filename of config file in share/dvb/dvb-s.")

#define SCANLIST_TEXT N_("Scan tuning list")
#define SCANLIST_LONGTEXT N_("Filename containing initial scan tuning data.")

#define SCAN_NIT_TEXT N_("Use NIT for scanning services")

vlc_module_begin ()
    set_shortname( N_("DVB") )
    set_description( N_("DVB input with v4l2 support") )
    set_category( CAT_INPUT )
    set_subcategory( SUBCAT_INPUT_ACCESS )

    add_bool( "dvb-probe", true, PROBE_TEXT, PROBE_LONGTEXT, true )
    /* DVB-S (satellite) */
    add_string( "dvb-satellite", NULL, SATELLITE_TEXT, SATELLITE_LONGTEXT,
                true )
    add_string( "dvb-scanlist", NULL, SCANLIST_TEXT, SCANLIST_LONGTEXT,
                true )
    add_bool( "dvb-scan-nit", true, SCAN_NIT_TEXT, NULL, true )

    set_capability( "access", 0 )
    add_shortcut( "dvb",                        /* Generic name */
                  "dvb-s", "qpsk", "satellite", /* Satellite */
                  "dvb-c", "cable",             /* Cable */
                  "dvb-t", "terrestrial" )      /* Terrestrial */

    set_callbacks( Open, Close )

vlc_module_end ()


/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int Control( stream_t *, int, va_list );

static block_t *BlockScan( stream_t *, bool * );

#define DVB_SCAN_MAX_LOCK_TIME (2*CLOCK_FREQ)

static void FilterUnset( stream_t *, int i_max );
static void FilterSet( stream_t *, int i_pid, int i_type );

static void VarInit( stream_t * );
static int  ParseMRL( stream_t * );

static int ScanFrontendTuningHandler( scan_t *, void *, const scan_tuner_config_t * );
static int ScanFilterHandler( scan_t *, void *, uint16_t, bool );
static int ScanStatsCallback( scan_t *p_scan, void *p_privdata, int *pi_snr );
static int ScanReadCallback( scan_t *, void *,  unsigned, size_t, uint8_t *, size_t *);

/*****************************************************************************
 * Open: open the frontend device
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    stream_t     *p_access = (stream_t*)p_this;
    access_sys_t *p_sys;

    if( p_access->b_preparsing )
        return VLC_EGENERIC;

    p_access->p_sys = p_sys = calloc( 1, sizeof( access_sys_t ) );
    if( !p_sys )
        return VLC_ENOMEM;

    /* Create all variables */
    VarInit( p_access );

    /* Parse the command line */
    if( ParseMRL( p_access ) )
    {
        free( p_sys );
        return VLC_EGENERIC;
    }

    bool b_scan_mode = var_GetInteger( p_access, "dvb-frequency" ) == 0;
    if( b_scan_mode )
    {
        msg_Dbg( p_access, "DVB scan mode selected" );
        p_access->pf_block = BlockScan;
    }
    else
        return VLC_EGENERIC; /* let the DTV plugin do the work */

    /* Getting frontend info */
    if( FrontendOpen( p_this, &p_sys->dvb, p_access->psz_name ) )
    {
        free( p_sys );
        return VLC_EGENERIC;
    }

    /* Opening DVR device */
    if( DVROpen( p_this, &p_sys->dvb ) < 0 )
    {
        FrontendClose( p_this, &p_sys->dvb );
        free( p_sys );
        return VLC_EGENERIC;
    }

    scan_parameter_t parameter;
    scan_t *p_scan;

    scan_parameter_Init( &parameter );

    parameter.b_use_nit = var_InheritBool( p_access, "dvb-scan-nit" );

    if( FrontendFillScanParameter( p_this, &p_sys->dvb, &parameter ) ||
            (p_scan = scan_New( VLC_OBJECT(p_access), &parameter,
                                ScanFrontendTuningHandler,
                                ScanStatsCallback,
                                ScanFilterHandler,
                                ScanReadCallback,
                                p_access )) == NULL )
    {
        scan_parameter_Clean( &parameter );
        Close( VLC_OBJECT(p_access) );
        return VLC_EGENERIC;
    }

    scan_parameter_Clean( &parameter );
    p_sys->scan = p_scan;


    /* Set up access */
    p_access->pf_control = Control;

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close : Close the device
 *****************************************************************************/
static void Close( vlc_object_t *p_this )
{
    stream_t     *p_access = (stream_t*)p_this;
    access_sys_t *p_sys = p_access->p_sys;

    FilterUnset( p_access, MAX_DEMUX );

    DVRClose( p_this, &p_sys->dvb );
    FrontendClose( p_this, &p_sys->dvb );
    scan_Destroy( p_sys->scan );

    free( p_sys );
}

static int ScanFrontendTuningHandler( scan_t *p_scan, void *p_privdata,
                                      const scan_tuner_config_t *p_cfg )
{
    stream_t *p_access = (stream_t *) p_privdata;
    access_sys_t *sys = p_access->p_sys;
    VLC_UNUSED(p_scan);

    var_SetInteger( p_access, "dvb-frequency", p_cfg->i_frequency );
    var_SetInteger( p_access, "dvb-bandwidth", p_cfg->i_bandwidth );

    if ( p_cfg->polarization != SCAN_POLARIZATION_NONE )
        var_SetInteger( p_access, "dvb-voltage", p_cfg->polarization == SCAN_POLARIZATION_HORIZONTAL ? 18 : 13 );

    if ( p_cfg->i_symbolrate )
        var_SetInteger( p_access, "dvb-srate", p_cfg->i_symbolrate );

    msg_Dbg( p_access, "Scanning frequency %d", p_cfg->i_frequency );
    msg_Dbg( p_access, " bandwidth %d", p_cfg->i_bandwidth );

    /* Setting frontend parameters for tuning the hardware */
    if( FrontendSet( VLC_OBJECT(p_access), &sys->dvb ) < 0 )
    {
        msg_Err( p_access, "Failed to tune the frontend" );
        return VLC_EGENERIC;
    }

    return VLC_SUCCESS;
}

static int ScanStatsCallback( scan_t *p_scan, void *p_privdata, int *pi_snr )
{
    stream_t *p_access = (stream_t *) p_privdata;
    access_sys_t *sys = p_access->p_sys;
    VLC_UNUSED(p_scan);

    frontend_statistic_t stat;
    if( !FrontendGetStatistic( &sys->dvb, &stat ) )
    {
        *pi_snr = stat.i_snr;
        return VLC_SUCCESS;
    }

    return VLC_EGENERIC;
}

static int ScanFilterHandler( scan_t *p_scan, void *p_privdata, uint16_t i_pid, bool b_set )
{
    stream_t *p_access = (stream_t *) p_privdata;
    VLC_UNUSED(p_scan);

    if( b_set )
        FilterSet( p_access, i_pid, OTHER_TYPE );

    return VLC_SUCCESS;
}

static int ScanReadCallback( scan_t *p_scan, void *p_privdata,
                             unsigned i_probe_timeout, size_t i_packets_max,
                             uint8_t *p_packet, size_t *pi_count )
{
    stream_t *p_access = (stream_t *) p_privdata;
    access_sys_t *p_sys = p_access->p_sys;
    *pi_count = 0;

    /* Initialize file descriptor sets */
    struct pollfd ufds[2];

    ufds[0].fd = p_sys->dvb.i_handle;
    ufds[0].events = POLLIN;
    ufds[1].fd = p_sys->dvb.i_frontend_handle;
    ufds[1].events = POLLPRI;

    frontend_status_t status;
    FrontendGetStatus( &p_sys->dvb, &status );
    bool b_has_lock = status.b_has_lock;

    vlc_tick_t i_scan_start = mdate();

    for( ; *pi_count == 0; )
    {
        /* Find if some data is available */
        int i_ret;

        vlc_tick_t i_timeout = b_has_lock ? i_probe_timeout:
                                         DVB_SCAN_MAX_LOCK_TIME;

        do
        {
            vlc_tick_t i_poll_timeout = i_scan_start - mdate() + i_timeout;

            i_ret = 0;

            if( vlc_killed() || scan_IsCancelled( p_scan ) )
                break;

            if( i_poll_timeout >= 0 )
                i_ret = vlc_poll_i11e( ufds, 2, i_poll_timeout / 1000 );
        }
        while( i_ret < 0 && errno == EINTR );

        if( i_ret < 0 )
        {
            return VLC_EGENERIC;
        }
        else if( i_ret == 0 )
        {
            return VLC_ENOITEM;
        }

        if( ufds[1].revents )
        {
            FrontendPoll( VLC_OBJECT(p_access), &p_sys->dvb );

            FrontendGetStatus( &p_sys->dvb, &status );
            if( status.b_has_lock && !b_has_lock )
            {
                i_scan_start = mdate();
                b_has_lock = true;
            }
        }

        if ( ufds[0].revents )
        {
            ssize_t i_read = read( p_sys->dvb.i_handle, p_packet, TS_PACKET_SIZE * i_packets_max );
            if( i_read < 0 )
            {
                msg_Warn( p_access, "read failed: %s", vlc_strerror_c(errno) );
                break;
            }
            else
            {
                *pi_count = i_read / TS_PACKET_SIZE;
            }
        }
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * BlockScan:
 *****************************************************************************/
static block_t *BlockScan( stream_t *p_access, bool *restrict eof )
{
    access_sys_t *p_sys = p_access->p_sys;
    scan_t *p_scan = p_sys->scan;
    block_t *p_block = NULL;

    if( scan_Run( p_scan ) != VLC_SUCCESS )
    {
        if( !p_sys->done )
        {
             msg_Info( p_access, "Scanning finished" );
             p_sys->done = true;
             p_block = scan_GetM3U( p_scan );
        }
        *eof = true;
    }

    return p_block;
}

/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( stream_t *p_access, int i_query, va_list args )
{
    access_sys_t *sys = p_access->p_sys;
    bool         *pb_bool;
    int64_t      *pi_64;
    double       *pf1, *pf2;
    frontend_statistic_t stat;

    switch( i_query )
    {
        case STREAM_CAN_SEEK:
        case STREAM_CAN_FASTSEEK:
        case STREAM_CAN_PAUSE:
        case STREAM_CAN_CONTROL_PACE:
            pb_bool = va_arg( args, bool * );
            *pb_bool = false;
            break;

        case STREAM_GET_CONTENT_TYPE:
            *va_arg( args, char** ) = strdup("application/vnd.apple.mpegurl"); // m3u8
            return VLC_SUCCESS;

        case STREAM_GET_PTS_DELAY:
            pi_64 = va_arg( args, int64_t * );
            *pi_64 = DEFAULT_PTS_DELAY;
            break;

        case STREAM_GET_SIGNAL:
            pf1 = va_arg( args, double * );
            pf2 = va_arg( args, double * );

            *pf1 = *pf2 = 0;
            if( !FrontendGetStatistic( &sys->dvb, &stat ) )
            {
                *pf1 = (double)stat.i_snr / 65535.0;
                *pf2 = (double)stat.i_signal_strenth / 65535.0;
            }
            break;

        default:
            return VLC_EGENERIC;

    }
    return VLC_SUCCESS;
}

/*****************************************************************************
 * FilterSet/FilterUnset:
 *****************************************************************************/
static void FilterSet( stream_t *p_access, int i_pid, int i_type )
{
    access_sys_t *p_sys = p_access->p_sys;
    int i;

    /* Find first free slot */
    for( i = 0; i < MAX_DEMUX; i++ )
    {
        if( !p_sys->p_demux_handles[i].i_type )
            break;

        if( p_sys->p_demux_handles[i].i_pid == i_pid )
            return; /* Already set */
    }

    if( i >= MAX_DEMUX )
    {
        msg_Err( p_access, "no free p_demux_handles !" );
        return;
    }

    if( DMXSetFilter( VLC_OBJECT(p_access), i_pid,
                           &p_sys->p_demux_handles[i].i_handle, i_type ) )
    {
        msg_Err( p_access, "DMXSetFilter failed" );
        return;
    }
    p_sys->p_demux_handles[i].i_type = i_type;
    p_sys->p_demux_handles[i].i_pid = i_pid;
}

static void FilterUnset( stream_t *p_access, int i_max )
{
    access_sys_t *p_sys = p_access->p_sys;

    for( int i = 0; i < i_max; i++ )
    {
        if( p_sys->p_demux_handles[i].i_type )
        {
            DMXUnsetFilter( VLC_OBJECT(p_access), p_sys->p_demux_handles[i].i_handle );
            p_sys->p_demux_handles[i].i_type = 0;
        }
    }
}

/*****************************************************************************
 * VarInit/ParseMRL:
 *****************************************************************************/
static void VarInit( stream_t *p_access )
{
    var_Create( p_access, "dvb-adapter", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_access, "dvb-device", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_access, "dvb-frequency", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_access, "dvb-inversion", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_access, "dvb-probe", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );

    /* */
    var_Create( p_access, "dvb-satellite", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
    var_Create( p_access, "dvb-satno", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_access, "dvb-voltage", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_access, "dvb-high-voltage", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
    var_Create( p_access, "dvb-tone", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_access, "dvb-srate", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_access, "dvb-lnb-lof1", VLC_VAR_INTEGER );
    var_Create( p_access, "dvb-lnb-lof2", VLC_VAR_INTEGER );
    var_Create( p_access, "dvb-lnb-slof", VLC_VAR_INTEGER );

    /* */
    var_Create( p_access, "dvb-bandwidth", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_access, "dvb-transmission", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_access, "dvb-hierarchy", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
}

/* */
static int ParseMRL( stream_t *p_access )
{
    char *psz_dup = strdup( p_access->psz_location );
    char *psz_parser = psz_dup;
    vlc_value_t         val;

#define GET_OPTION_INT( option )                                            \
    if ( !strncmp( psz_parser, option "=", strlen(option "=") ) )           \
    {                                                                       \
        val.i_int = strtol( psz_parser + strlen(option "="), &psz_parser,   \
                            0 );                                            \
        var_Set( p_access, "dvb-" option, val );                            \
    }

#define GET_OPTION_BOOL( option )                                           \
    if ( !strncmp( psz_parser, option "=", strlen(option "=") ) )           \
    {                                                                       \
        val.b_bool = strtol( psz_parser + strlen(option "="), &psz_parser,  \
                             0 );                                           \
        var_Set( p_access, "dvb-" option, val );                            \
    }

#define GET_OPTION_STRING( option )                                         \
    if ( !strncmp( psz_parser, option "=", strlen( option "=" ) ) )         \
    {                                                                       \
        psz_parser += strlen( option "=" );                                 \
        val.psz_string = psz_parser;                                        \
        char *p_save;                                                       \
        char *tok = strtok_r(val.psz_string, ":", &p_save);                 \
        val.psz_string[tok - val.psz_string - 1] = 0;                       \
        var_Set( p_access, "dvb-" option, val );                            \
        psz_parser += strlen( val.psz_string );                             \
    }

    while( *psz_parser )
    {
        GET_OPTION_INT("adapter")
        else GET_OPTION_INT("device")
        else GET_OPTION_INT("frequency")
        else GET_OPTION_INT("inversion")
        else GET_OPTION_BOOL("probe")
        else GET_OPTION_BOOL("budget-mode")

        else GET_OPTION_STRING("satellite")
        else GET_OPTION_INT("voltage")
        else GET_OPTION_BOOL("high-voltage")
        else GET_OPTION_INT("tone")
        else GET_OPTION_INT("satno")
        else GET_OPTION_INT("srate")
        else GET_OPTION_INT("lnb-lof1")
        else GET_OPTION_INT("lnb-lof2")
        else GET_OPTION_INT("lnb-slof")

        else GET_OPTION_INT("bandwidth")
        else GET_OPTION_INT("transmission")
        else GET_OPTION_INT("hierarchy")

        /* Redundant with voltage but much easier to use */
        else if( !strncmp( psz_parser, "polarization=",
                           strlen( "polarization=" ) ) )
        {
            psz_parser += strlen( "polarization=" );
            if ( *psz_parser == 'V' || *psz_parser == 'v' )
                val.i_int = 13;
            else if ( *psz_parser == 'H' || *psz_parser == 'h' )
                val.i_int = 18;
            else
            {
                msg_Warn( p_access, "illegal polarization %c", *psz_parser );
                free( psz_dup );
                return VLC_EGENERIC;
            }
            var_Set( p_access, "dvb-voltage", val );
        }
        else
        {
            msg_Warn( p_access, "unknown option (%s)", psz_parser );
            free( psz_dup );
            return VLC_EGENERIC;
        }

        if ( *psz_parser )
            psz_parser++;
    }
#undef GET_OPTION_INT
#undef GET_OPTION_BOOL
#undef GET_OPTION_STRING

    free( psz_dup );
    return VLC_SUCCESS;
}