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/*****************************************************************************
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 * dshow.cpp : DirectShow access module for vlc
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 *****************************************************************************
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 * Copyright (C) 2002, 2003 VideoLAN
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 * $Id$
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 *
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 * Author: Gildas Bazin <gbazin@videolan.org>
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 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <vlc/vlc.h>
#include <vlc/input.h>
#include <vlc/vout.h>

#include "filter.h"

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/*****************************************************************************
 * Access: local prototypes
 *****************************************************************************/
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static int AccessRead    ( access_t *, byte_t *, int );
static int ReadCompressed( access_t *, byte_t *, int );
static int AccessControl ( access_t *, int, va_list );
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static int OpenDevice( access_t *, string, vlc_bool_t );
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static IBaseFilter *FindCaptureDevice( vlc_object_t *, string *,
                                       list<string> *, vlc_bool_t );
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static size_t EnumDeviceCaps( vlc_object_t *, IBaseFilter *,
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                              int, int, int, int, int, int,
                              AM_MEDIA_TYPE *mt, size_t );
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static bool ConnectFilters( access_t *, IBaseFilter *, CaptureFilter * );
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static int FindDevicesCallback( vlc_object_t *, char const *,
                                vlc_value_t, vlc_value_t, void * );
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static int ConfigDevicesCallback( vlc_object_t *, char const *,
                                  vlc_value_t, vlc_value_t, void * );
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static void PropertiesPage( vlc_object_t *, IBaseFilter *,
                            ICaptureGraphBuilder2 *, vlc_bool_t );
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#if 0
    /* Debug only, use this to find out GUIDs */
    unsigned char p_st[];
    UuidToString( (IID *)&IID_IAMBufferNegotiation, &p_st );
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    msg_Err( p_access, "BufferNegotiation: %s" , p_st );
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#endif

/*
 * header:
 *  fcc  ".dsh"
 *  u32    stream count
 *      fcc "auds"|"vids"       0
 *      fcc codec               4
 *      if vids
 *          u32 width           8
 *          u32 height          12
 *          u32 padding         16
 *      if auds
 *          u32 channels        12
 *          u32 samplerate      8
 *          u32 samplesize      16
 *
 * data:
 *  u32     stream number
 *  u32     data size
 *  u8      data
 */

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/*****************************************************************************
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 * Module descriptor
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 *****************************************************************************/
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static char *ppsz_vdev[] = { "", "none" };
static char *ppsz_vdev_text[] = { N_("Default"), N_("None") };
static char *ppsz_adev[] = { "", "none" };
static char *ppsz_adev_text[] = { N_("Default"), N_("None") };

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#define CACHING_TEXT N_("Caching value in ms")
#define CACHING_LONGTEXT N_( \
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    "Allows you to modify the default caching value for DirectShow streams. " \
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    "This value should be set in milliseconds units." )
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#define VDEV_TEXT N_("Video device name")
#define VDEV_LONGTEXT N_( \
    "You can specify the name of the video device that will be used by the " \
    "DirectShow plugin. If you don't specify anything, the default device " \
    "will be used.")
#define ADEV_TEXT N_("Audio device name")
#define ADEV_LONGTEXT N_( \
    "You can specify the name of the audio device that will be used by the " \
    "DirectShow plugin. If you don't specify anything, the default device " \
    "will be used.")
#define SIZE_TEXT N_("Video size")
#define SIZE_LONGTEXT N_( \
    "You can specify the size of the video that will be displayed by the " \
    "DirectShow plugin. If you don't specify anything the default size for " \
    "your device will be used.")
#define CHROMA_TEXT N_("Video input chroma format")
#define CHROMA_LONGTEXT N_( \
    "Force the DirectShow video input to use a specific chroma format " \
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    "(eg. I420 (default), RV24, etc.)")
#define CONFIG_TEXT N_("Device properties")
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#define CONFIG_LONGTEXT N_( \
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    "Show the properties dialog of the selected device before starting the " \
    "stream.")
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static int  AccessOpen ( vlc_object_t * );
static void AccessClose( vlc_object_t * );

static int  DemuxOpen  ( vlc_object_t * );
static void DemuxClose ( vlc_object_t * );

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vlc_module_begin();
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    set_shortname( _("DirectShow") );
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    set_description( _("DirectShow input") );
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    add_integer( "dshow-caching", (mtime_t)(0.2*CLOCK_FREQ) / 1000, NULL,
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                 CACHING_TEXT, CACHING_LONGTEXT, VLC_TRUE );
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    add_string( "dshow-vdev", NULL, NULL, VDEV_TEXT, VDEV_LONGTEXT, VLC_FALSE);
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        change_string_list( ppsz_vdev, ppsz_vdev_text, FindDevicesCallback );
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        change_action_add( FindDevicesCallback, N_("Refresh list") );
        change_action_add( ConfigDevicesCallback, N_("Configure") );
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    add_string( "dshow-adev", NULL, NULL, ADEV_TEXT, ADEV_LONGTEXT, VLC_FALSE);
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        change_string_list( ppsz_adev, ppsz_adev_text, FindDevicesCallback );
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        change_action_add( FindDevicesCallback, N_("Refresh list") );
        change_action_add( ConfigDevicesCallback, N_("Configure") );
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    add_string( "dshow-size", NULL, NULL, SIZE_TEXT, SIZE_LONGTEXT, VLC_FALSE);
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    add_string( "dshow-chroma", NULL, NULL, CHROMA_TEXT, CHROMA_LONGTEXT,
                VLC_TRUE );
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    add_bool( "dshow-config", VLC_FALSE, NULL, CONFIG_TEXT, CONFIG_LONGTEXT,
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              VLC_FALSE );
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    add_shortcut( "dshow" );
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    set_capability( "access2", 0 );
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    set_callbacks( AccessOpen, AccessClose );

    add_submodule();
    set_description( _("DirectShow demuxer") );
    add_shortcut( "dshow" );
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    set_capability( "demux2", 200 );
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    set_callbacks( DemuxOpen, DemuxClose );

vlc_module_end();

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/****************************************************************************
 * DirectShow elementary stream descriptor
 ****************************************************************************/
typedef struct dshow_stream_t
{
    string          devicename;
    IBaseFilter     *p_device_filter;
    CaptureFilter   *p_capture_filter;
    AM_MEDIA_TYPE   mt;
    int             i_fourcc;

    union
    {
      VIDEOINFOHEADER video;
      WAVEFORMATEX    audio;

    } header;

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    vlc_bool_t      b_pts;
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} dshow_stream_t;

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/****************************************************************************
 * Access descriptor declaration
 ****************************************************************************/
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#define MAX_CROSSBAR_DEPTH 10

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typedef struct CrossbarRouteRec
{
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    IAMCrossbar *pXbar;
    LONG        VideoInputIndex;
    LONG        VideoOutputIndex;
    LONG        AudioInputIndex;
    LONG        AudioOutputIndex;
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} CrossbarRoute;

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struct access_sys_t
{
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    /* These 2 must be left at the beginning */
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    vlc_mutex_t lock;
    vlc_cond_t  wait;

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    IFilterGraph           *p_graph;
    ICaptureGraphBuilder2  *p_capture_graph_builder2;
    IMediaControl          *p_control;

    int                     i_crossbar_route_depth;
    CrossbarRoute           crossbar_routes[MAX_CROSSBAR_DEPTH];
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    /* header */
    int     i_header_size;
    int     i_header_pos;
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    uint8_t *p_header;
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    /* list of elementary streams */
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    dshow_stream_t **pp_streams;
    int            i_streams;
    int            i_current_stream;
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    /* misc properties */
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    int            i_mtu;
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    int            i_width;
    int            i_height;
    int            i_chroma;
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    int            b_audio;
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};

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/****************************************************************************
 * DirectShow utility functions
 ****************************************************************************/
static void CreateDirectShowGraph( access_sys_t *p_sys )
{
    p_sys->i_crossbar_route_depth = 0;

    /* Create directshow filter graph */
    if( SUCCEEDED( CoCreateInstance( CLSID_FilterGraph, 0, CLSCTX_INPROC,
                       (REFIID)IID_IFilterGraph, (void **)&p_sys->p_graph) ) )
    {
        /* Create directshow capture graph builder if available */
        if( SUCCEEDED( CoCreateInstance( CLSID_CaptureGraphBuilder2, 0,
                         CLSCTX_INPROC, (REFIID)IID_ICaptureGraphBuilder2,
                         (void **)&p_sys->p_capture_graph_builder2 ) ) )
        {
            p_sys->p_capture_graph_builder2->
                SetFiltergraph((IGraphBuilder *)p_sys->p_graph);
        }

        p_sys->p_graph->QueryInterface( IID_IMediaControl,
                                        (void **)&p_sys->p_control );
    }
}

static void DeleteCrossbarRoutes( access_sys_t *p_sys )
{
    /* Remove crossbar filters from graph */
    for( int i = 0; i < p_sys->i_crossbar_route_depth; i++ )
    {
        p_sys->crossbar_routes[i].pXbar->Release();
    }
    p_sys->i_crossbar_route_depth = 0;
}

static void DeleteDirectShowGraph( access_sys_t *p_sys )
{
    DeleteCrossbarRoutes( p_sys );

    /* Remove filters from graph */
    for( int i = 0; i < p_sys->i_streams; i++ )
    {
        p_sys->p_graph->RemoveFilter( p_sys->pp_streams[i]->p_capture_filter );
        p_sys->p_graph->RemoveFilter( p_sys->pp_streams[i]->p_device_filter );
        p_sys->pp_streams[i]->p_capture_filter->Release();
        p_sys->pp_streams[i]->p_device_filter->Release();
    }

    /* Release directshow objects */
    if( p_sys->p_control )
    {
        p_sys->p_control->Release();
        p_sys->p_control = NULL;
    }
    if( p_sys->p_capture_graph_builder2 )
    {
        p_sys->p_capture_graph_builder2->Release();
        p_sys->p_capture_graph_builder2 = NULL;
    }

    if( p_sys->p_graph )
    {
        p_sys->p_graph->Release();
        p_sys->p_graph = NULL;
    }
}

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static void ReleaseDirectShow( access_t *p_access )
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{
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    access_sys_t *p_sys = p_access->p_sys;
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    msg_Dbg( p_access, "Releasing DirectShow");
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    DeleteDirectShowGraph( p_sys );

    /* Uninitialize OLE/COM */
    CoUninitialize();

    free( p_sys->p_header );
    /* Remove filters from graph */
    for( int i = 0; i < p_sys->i_streams; i++ )
    {
        delete p_sys->pp_streams[i];
    }
    free( p_sys->pp_streams );
    free( p_sys );
}

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/*****************************************************************************
 * Open: open direct show device
 *****************************************************************************/
static int AccessOpen( vlc_object_t *p_this )
{
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    access_t     *p_access = (access_t*)p_this;
    access_sys_t *p_sys;
    vlc_value_t  val;
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    /* Get/parse options and open device(s) */
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    string vdevname, adevname;
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    int i_width = 0, i_height = 0, i_chroma = 0;
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    var_Create( p_access, "dshow-config", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT);
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    var_Create( p_access, "dshow-vdev", VLC_VAR_STRING | VLC_VAR_DOINHERIT);
    var_Get( p_access, "dshow-vdev", &val );
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    if( val.psz_string ) vdevname = string( val.psz_string );
    if( val.psz_string ) free( val.psz_string );
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    var_Create( p_access, "dshow-adev", VLC_VAR_STRING | VLC_VAR_DOINHERIT);
    var_Get( p_access, "dshow-adev", &val );
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    if( val.psz_string ) adevname = string( val.psz_string );
    if( val.psz_string ) free( val.psz_string );

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    var_Create( p_access, "dshow-size", VLC_VAR_STRING | VLC_VAR_DOINHERIT);
    var_Get( p_access, "dshow-size", &val );
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    if( val.psz_string && *val.psz_string )
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    {
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        if( !strcmp( val.psz_string, "subqcif" ) )
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        {
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            i_width  = 128; i_height = 96;
        }
        else if( !strcmp( val.psz_string, "qsif" ) )
        {
            i_width  = 160; i_height = 120;
        }
        else if( !strcmp( val.psz_string, "qcif" ) )
        {
            i_width  = 176; i_height = 144;
        }
        else if( !strcmp( val.psz_string, "sif" ) )
        {
            i_width  = 320; i_height = 240;
        }
        else if( !strcmp( val.psz_string, "cif" ) )
        {
            i_width  = 352; i_height = 288;
        }
        else if( !strcmp( val.psz_string, "vga" ) )
        {
            i_width  = 640; i_height = 480;
        }
        else
        {
            /* Width x Height */
            char *psz_parser;
            i_width = strtol( val.psz_string, &psz_parser, 0 );
            if( *psz_parser == 'x' || *psz_parser == 'X')
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            {
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                i_height = strtol( psz_parser + 1, &psz_parser, 0 );
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            }
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            msg_Dbg( p_access, "Width x Height %dx%d", i_width, i_height );
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        }
    }
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    if( val.psz_string ) free( val.psz_string );
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    var_Create( p_access, "dshow-chroma", VLC_VAR_STRING | VLC_VAR_DOINHERIT);
    var_Get( p_access, "dshow-chroma", &val );
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    if( val.psz_string && strlen( val.psz_string ) >= 4 )
    {
        i_chroma = VLC_FOURCC( val.psz_string[0], val.psz_string[1],
                               val.psz_string[2], val.psz_string[3] );
    }
    if( val.psz_string ) free( val.psz_string );
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    /* Setup Access */
    p_access->pf_read = AccessRead;
    p_access->pf_block = NULL;
    p_access->pf_control = AccessControl;
    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 = VLC_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 ) );
    memset( p_sys, 0, sizeof( access_sys_t ) );

    var_Create( p_access, "dshow-caching",
                VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
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    /* Initialize OLE/COM */
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    CoInitialize( 0 );
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    /* Initialize some data */
    p_sys->i_streams = 0;
    p_sys->pp_streams = (dshow_stream_t **)malloc( 1 );
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    p_sys->i_width = i_width;
    p_sys->i_height = i_height;
    p_sys->i_chroma = i_chroma;
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    p_sys->b_audio = VLC_TRUE;
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    p_sys->i_mtu = 0;
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    /* Create header */
    p_sys->i_header_size = 8;
    p_sys->p_header      = (uint8_t *)malloc( p_sys->i_header_size );
    memcpy(  &p_sys->p_header[0], ".dsh", 4 );
    SetDWBE( &p_sys->p_header[4], 1 );
    p_sys->i_header_pos = p_sys->i_header_size;
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    p_sys->p_graph = NULL;
    p_sys->p_capture_graph_builder2 = NULL;
    p_sys->p_control = NULL;
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    /* Build directshow graph */
    CreateDirectShowGraph( p_sys );
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    if( OpenDevice( p_access, vdevname, 0 ) != VLC_SUCCESS )
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    {
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        msg_Err( p_access, "can't open video");
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    }

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    if( p_sys->b_audio && OpenDevice( p_access, adevname, 1 ) != VLC_SUCCESS )
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    {
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        msg_Err( p_access, "can't open audio");
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    }
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    for( int i = 0; i < p_sys->i_crossbar_route_depth; i++ )
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    {
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        IAMCrossbar *pXbar = p_sys->crossbar_routes[i].pXbar;
        LONG VideoInputIndex = p_sys->crossbar_routes[i].VideoInputIndex;
        LONG VideoOutputIndex = p_sys->crossbar_routes[i].VideoOutputIndex;
        LONG AudioInputIndex = p_sys->crossbar_routes[i].AudioInputIndex;
        LONG AudioOutputIndex = p_sys->crossbar_routes[i].AudioOutputIndex;
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        if( SUCCEEDED(pXbar->Route(VideoOutputIndex, VideoInputIndex)) )
        {
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            msg_Dbg( p_access, "Crossbar at depth %d, Routed video "
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                     "ouput %ld to video input %ld", i, VideoOutputIndex,
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                     VideoInputIndex );
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            if( AudioOutputIndex != -1 && AudioInputIndex != -1 )
            {
                if( SUCCEEDED( pXbar->Route(AudioOutputIndex,
                                            AudioInputIndex)) )
                {
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                    msg_Dbg(p_access, "Crossbar at depth %d, Routed audio "
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                            "ouput %ld to audio input %ld", i,
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                            AudioOutputIndex, AudioInputIndex );
                }
            }
        }
    }

    if( !p_sys->i_streams )
    {
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        ReleaseDirectShow( p_access );
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        return VLC_EGENERIC;
    }

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    /* Initialize some data */
    p_sys->i_current_stream = 0;
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    p_sys->i_mtu += p_sys->i_header_size + 16 /* data header size */;
    vlc_mutex_init( p_access, &p_sys->lock );
    vlc_cond_init( p_access, &p_sys->wait );
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    msg_Dbg( p_access, "Playing...");
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    /* Everything is ready. Let's rock baby */
    p_sys->p_control->Run();

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    return VLC_SUCCESS;
}

/*****************************************************************************
 * AccessClose: close device
 *****************************************************************************/
static void AccessClose( vlc_object_t *p_this )
{
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    access_t     *p_access = (access_t *)p_this;
    access_sys_t *p_sys    = p_access->p_sys;
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    /* Stop capturing stuff */
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    p_sys->p_control->Stop();
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    ReleaseDirectShow( p_access );
}

/*****************************************************************************
 * AccessControl:
 *****************************************************************************/
static int AccessControl( 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:
        case ACCESS_CAN_PAUSE:
        case ACCESS_CAN_CONTROL_PACE:
            pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
            *pb_bool = VLC_FALSE;
            break;

        /* */
        case ACCESS_GET_MTU:
            pi_int = (int*)va_arg( args, int * );
            *pi_int = p_sys->i_mtu;
            break;

        case ACCESS_GET_PTS_DELAY:
            pi_64 = (int64_t*)va_arg( args, int64_t * );
            *pi_64 = (int64_t)var_GetInteger( p_access, "dshow-caching" ) *
                                              I64C(1000);
            break;

        /* */
        case ACCESS_SET_PAUSE_STATE:
        case ACCESS_GET_TITLE_INFO:
        case ACCESS_SET_TITLE:
        case ACCESS_SET_SEEKPOINT:
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        case ACCESS_SET_PRIVATE_ID_STATE:
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            return VLC_EGENERIC;

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

    }
    return VLC_SUCCESS;
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}

/****************************************************************************
 * RouteCrossbars (Does not AddRef the returned *Pin)
 ****************************************************************************/
static HRESULT GetCrossbarIPinAtIndex( IAMCrossbar *pXbar, LONG PinIndex,
                                       BOOL IsInputPin, IPin ** ppPin )
{
    LONG         cntInPins, cntOutPins;
    IPin        *pP = 0;
    IBaseFilter *pFilter = NULL;
    IEnumPins   *pins=0;
    ULONG        n;

    if( !pXbar || !ppPin ) return E_POINTER;

    *ppPin = 0;

    if( S_OK != pXbar->get_PinCounts(&cntOutPins, &cntInPins) ) return E_FAIL;

    LONG TrueIndex = IsInputPin ? PinIndex : PinIndex + cntInPins;

    if( pXbar->QueryInterface(IID_IBaseFilter, (void **)&pFilter) == S_OK )
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    {
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        if( SUCCEEDED(pFilter->EnumPins(&pins)) ) 
        {
            LONG i = 0;
            while( pins->Next(1, &pP, &n) == S_OK ) 
            {
                pP->Release();
                if( i == TrueIndex ) 
                {
                    *ppPin = pP;
                    break;
                }
                i++;
            }
            pins->Release();
        }
        pFilter->Release();
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    }
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    return *ppPin ? S_OK : E_FAIL; 
}
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/****************************************************************************
 * GetCrossbarIndexFromIPin: Find corresponding index of an IPin on a crossbar
 ****************************************************************************/
static HRESULT GetCrossbarIndexFromIPin( IAMCrossbar * pXbar, LONG * PinIndex,
                                         BOOL IsInputPin, IPin * pPin )
{
    LONG         cntInPins, cntOutPins;
    IPin        *pP = 0;
    IBaseFilter *pFilter = NULL;
    IEnumPins   *pins = 0;
    ULONG        n;
    BOOL         fOK = FALSE;

    if(!pXbar || !PinIndex || !pPin )
        return E_POINTER;

    if( S_OK != pXbar->get_PinCounts(&cntOutPins, &cntInPins) )
        return E_FAIL;

    if( pXbar->QueryInterface(IID_IBaseFilter, (void **)&pFilter) == S_OK )
    {
        if( SUCCEEDED(pFilter->EnumPins(&pins)) )
        {
            LONG i=0;

            while( pins->Next(1, &pP, &n) == S_OK )
            {
                pP->Release();
                if( pPin == pP )
                {
                    *PinIndex = IsInputPin ? i : i - cntInPins;
                    fOK = TRUE;
                    break;
                }
                i++;
            }
            pins->Release();
        }
        pFilter->Release();
    }

    return fOK ? S_OK : E_FAIL; 
}

/****************************************************************************
 * FindCrossbarRoutes
 ****************************************************************************/
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static HRESULT FindCrossbarRoutes( access_t *p_access, IPin *p_input_pin,
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                                   LONG physicalType, int depth = 0 )
{
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    access_sys_t *p_sys = p_access->p_sys;
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    HRESULT result = S_FALSE;

    IPin *p_output_pin;
    if( FAILED(p_input_pin->ConnectedTo(&p_output_pin)) ) return S_FALSE;

    // It is connected, so now find out if the filter supports IAMCrossbar
    PIN_INFO pinInfo;
    if( FAILED(p_output_pin->QueryPinInfo(&pinInfo)) ||
        PINDIR_OUTPUT != pinInfo.dir )
    {
        p_output_pin->Release ();
        return S_FALSE;
    }

    IAMCrossbar *pXbar=0;
    if( FAILED(pinInfo.pFilter->QueryInterface(IID_IAMCrossbar,
                                               (void **)&pXbar)) )
    {
        pinInfo.pFilter->Release();
        p_output_pin->Release ();
        return S_FALSE;
    }

    LONG inputPinCount, outputPinCount;
    if( FAILED(pXbar->get_PinCounts(&outputPinCount, &inputPinCount)) )
    {
        pXbar->Release();
        pinInfo.pFilter->Release();
        p_output_pin->Release ();
        return S_FALSE;
    }

    LONG inputPinIndexRelated, outputPinIndexRelated;
    LONG inputPinPhysicalType, outputPinPhysicalType;
    LONG inputPinIndex, outputPinIndex;
    if( FAILED(GetCrossbarIndexFromIPin( pXbar, &outputPinIndex,
                                         FALSE, p_output_pin )) ||
        FAILED(pXbar->get_CrossbarPinInfo( FALSE, outputPinIndex,
                                           &outputPinIndexRelated,
                                           &outputPinPhysicalType )) )
    {
        pXbar->Release();
        pinInfo.pFilter->Release();
        p_output_pin->Release ();
        return S_FALSE;
    }

    //
    // for all input pins
    //
    for( inputPinIndex = 0; S_OK != result && inputPinIndex < inputPinCount;
         inputPinIndex++ ) 
    {
        if( FAILED(pXbar->get_CrossbarPinInfo( TRUE,  inputPinIndex,
                &inputPinIndexRelated, &inputPinPhysicalType )) ) continue;
   
        // Is the pin a video pin?
        if( inputPinPhysicalType != physicalType ) continue;

        // Can we route it?
        if( FAILED(pXbar->CanRoute(outputPinIndex, inputPinIndex)) ) continue;

        IPin *pPin;
        if( FAILED(GetCrossbarIPinAtIndex( pXbar, inputPinIndex,
                                           TRUE, &pPin)) ) continue;

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        result = FindCrossbarRoutes( p_access, pPin, physicalType, depth+1 );
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        if( S_OK == result || (S_FALSE == result &&
              physicalType == inputPinPhysicalType &&
              (p_sys->i_crossbar_route_depth = depth+1) < MAX_CROSSBAR_DEPTH) )
        {
            // hold on crossbar
            pXbar->AddRef();

            // remember crossbar route
            p_sys->crossbar_routes[depth].pXbar = pXbar;
            p_sys->crossbar_routes[depth].VideoInputIndex = inputPinIndex;
            p_sys->crossbar_routes[depth].VideoOutputIndex = outputPinIndex;
            p_sys->crossbar_routes[depth].AudioInputIndex = inputPinIndexRelated;
            p_sys->crossbar_routes[depth].AudioOutputIndex = outputPinIndexRelated;

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            msg_Dbg( p_access, "Crossbar at depth %d, Found Route For "
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                     "ouput %ld (type %ld) to input %ld (type %ld)", depth,
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                     outputPinIndex, outputPinPhysicalType, inputPinIndex,
                     inputPinPhysicalType );

            result = S_OK;
        }
    }

    pXbar->Release();
    pinInfo.pFilter->Release();
    p_output_pin->Release ();

    return result;
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}

/****************************************************************************
 * ConnectFilters
 ****************************************************************************/
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static bool ConnectFilters( access_t *p_access, IBaseFilter *p_filter,
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                            CaptureFilter *p_capture_filter )
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{
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    access_sys_t *p_sys = p_access->p_sys;
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    CapturePin *p_input_pin = p_capture_filter->CustomGetPin();
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    AM_MEDIA_TYPE mediaType = p_input_pin->CustomGetMediaType();
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    if( p_sys->p_capture_graph_builder2 )
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    {
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        if( FAILED(p_sys->p_capture_graph_builder2->
                     RenderStream( &PIN_CATEGORY_CAPTURE, &mediaType.majortype,
                                   p_filter, NULL,
                                   (IBaseFilter *)p_capture_filter )) )
        {
            return false;
        }
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        // Sort out all the possible video inputs
        // The class needs to be given the capture filters ANALOGVIDEO input pin
        IEnumPins *pins = 0;
        if( mediaType.majortype == MEDIATYPE_Video &&
            SUCCEEDED(p_filter->EnumPins(&pins)) )
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        {
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            IPin        *pP = 0;
            ULONG        n;
            PIN_INFO     pinInfo;
            BOOL         Found = FALSE;
            IKsPropertySet *pKs=0;
            GUID guid;
            DWORD dw;

            while( !Found && (S_OK == pins->Next(1, &pP, &n)) )
            {
                if(S_OK == pP->QueryPinInfo(&pinInfo))
                {
                    if(pinInfo.dir == PINDIR_INPUT)
                    {
                        // is this pin an ANALOGVIDEOIN input pin?
                        if( pP->QueryInterface(IID_IKsPropertySet,
                                               (void **)&pKs) == S_OK )
                        {
                            if( pKs->Get(AMPROPSETID_Pin,
                                         AMPROPERTY_PIN_CATEGORY, NULL, 0,
                                         &guid, sizeof(GUID), &dw) == S_OK )
                            {
                                if( guid == PIN_CATEGORY_ANALOGVIDEOIN )
                                {
                                    // recursively search crossbar routes
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                                    FindCrossbarRoutes( p_access, pP,
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                                                        PhysConn_Video_Tuner );
                                    // found it
                                    Found = TRUE;
                                }
                            }
                            pKs->Release();
                        }
                    }
                    pinInfo.pFilter->Release();
                }
                pP->Release();
            }
            pins->Release();
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        }
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        return true;
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    }
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    else
    {
        IEnumPins *p_enumpins;
        IPin *p_pin;
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        if( S_OK != p_filter->EnumPins( &p_enumpins ) ) return false;

        while( S_OK == p_enumpins->Next( 1, &p_pin, NULL ) )
        {
            PIN_DIRECTION pin_dir;
            p_pin->QueryDirection( &pin_dir );

            if( pin_dir == PINDIR_OUTPUT &&
                p_sys->p_graph->ConnectDirect( p_pin, (IPin *)p_input_pin,
                                               0 ) == S_OK )
            {
                p_pin->Release();
                p_enumpins->Release();
                return true;
            }
            p_pin->Release();
        }

        p_enumpins->Release();
        return false;
    }
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}

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/*
** get fourcc priority from arbritary preference, the higher the better
*/
static int GetFourCCPriority(int i_fourcc)
{
    switch( i_fourcc )
    {
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        case VLC_FOURCC('I','4','2','0'):
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        case VLC_FOURCC('f','l','3','2'):
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        {
            return 9;
        }

        case VLC_FOURCC('Y','V','1','2'):
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        case VLC_FOURCC('a','r','a','w'):
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        {
            return 8;
        }

        case VLC_FOURCC('R','V','2','4'):
        {
            return 7;
        }

        case VLC_FOURCC('Y','U','Y','2'):
        case VLC_FOURCC('R','V','3','2'):
        case VLC_FOURCC('R','G','B','A'):
        {
            return 6;
        }
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    }
    return 0;
}

#define MAX_MEDIA_TYPES 32

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static int OpenDevice( access_t *p_access, string devicename,
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                       vlc_bool_t b_audio )
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{
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    access_sys_t *p_sys = p_access->p_sys;
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    /* See if device is already opened */
    for( int i = 0; i < p_sys->i_streams; i++ )
    {
        if( p_sys->pp_streams[i]->devicename == devicename )
        {
            /* Already opened */
            return VLC_SUCCESS;
        }
    }

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    list<string> list_devices;

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    /* Enumerate devices and display their names */
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    FindCaptureDevice( (vlc_object_t *)p_access, NULL, &list_devices, b_audio );
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    if( !list_devices.size() )
        return VLC_EGENERIC;

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    list<string>::iterator iter;
    for( iter = list_devices.begin(); iter != list_devices.end(); iter++ )
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        msg_Dbg( p_access, "found device: %s", iter->c_str() );
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    /* If no device name was specified, pick the 1st one */
    if( devicename.size() == 0 )
    {
        devicename = *list_devices.begin();
    }

    // Use the system device enumerator and class enumerator to find
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    // a capture/preview device, such as a desktop USB video camera.
    IBaseFilter *p_device_filter =
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        FindCaptureDevice( (vlc_object_t *)p_access, &devicename,
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                           NULL, b_audio );
    if( p_device_filter )
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        msg_Dbg( p_access, "using device: %s", devicename.c_str() );
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    else
    {
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        msg_Err( p_access, "can't use device: %s, unsupported device type",
                 devicename.c_str() );
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        return VLC_EGENERIC;
    }
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    AM_MEDIA_TYPE *mt;
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    AM_MEDIA_TYPE media_types[MAX_MEDIA_TYPES];

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    size_t mt_count = EnumDeviceCaps( (vlc_object_t *)p_access,
                                      p_device_filter, p_sys->i_chroma,
                                      p_sys->i_width, p_sys->i_height,
                                      0, 0, 0, media_types, MAX_MEDIA_TYPES );
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    if( mt_count > 0 )
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    {
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	mt = (AM_MEDIA_TYPE *)malloc( sizeof(AM_MEDIA_TYPE)*mt_count );

	// Order and copy returned media types according to arbitrary
	// fourcc priority
	for( size_t c=0; c<mt_count; c++ )
	{
	    int slot_priority =
		GetFourCCPriority(GetFourCCFromMediaType(media_types[c]));
	    size_t slot_copy = c;
	    for( size_t d=c+1; d<mt_count; d++ )
	    {
		int priority =
		    GetFourCCPriority(GetFourCCFromMediaType(media_types[d]));
		if( priority > slot_priority )
		{
		    slot_priority = priority;
		    slot_copy = d;
		}
	    }
	    if( slot_copy != c )
	    {
		mt[c] = media_types[slot_copy];
		media_types[slot_copy] = media_types[c];
	    }
	    else
	    {
		mt[c] = media_types[c];
	    }
	}
    }
    else if( ! b_audio ) {
	// Use default video media type
        AM_MEDIA_TYPE mtr;
	VIDEOINFOHEADER vh;

	mtr.majortype            = MEDIATYPE_Video;
	mtr.subtype              = MEDIASUBTYPE_I420;
	mtr.bFixedSizeSamples    = TRUE;
	mtr.bTemporalCompression = FALSE;
	mtr.lSampleSize          = 0;
	mtr.pUnk                 = NULL;
	mtr.formattype           = FORMAT_VideoInfo;
	mtr.cbFormat             = sizeof(vh);
	mtr.pbFormat             = (BYTE *)&vh;

        memset(&vh, 0, sizeof(vh));

	vh.bmiHeader.biSize        = sizeof(vh.bmiHeader);
	vh.bmiHeader.biWidth       = p_sys->i_width > 0 ? p_sys->i_width: 320;
	vh.bmiHeader.biHeight      = p_sys->i_height > 0 ? p_sys->i_height : 240;
	vh.bmiHeader.biPlanes      = 1;
	vh.bmiHeader.biBitCount    = 24;
	vh.bmiHeader.biCompression = VLC_FOURCC('I','4','2','0');
	vh.bmiHeader.biSizeImage   = p_sys->i_width * 24 * p_sys->i_height / 8;

        msg_Warn( p_access, "device %s using built-in video media type",
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                 devicename.c_str() );
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	mt_count = 1;
	mt = (AM_MEDIA_TYPE *)malloc( sizeof(AM_MEDIA_TYPE)*mt_count );
	CopyMediaType(mt, &mtr);
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    }
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    else {
	// Use default audio media type
        AM_MEDIA_TYPE mtr;
	WAVEFORMATEX wf;

	mtr.majortype            = MEDIATYPE_Audio;
	mtr.subtype              = MEDIASUBTYPE_PCM;
	mtr.bFixedSizeSamples    = TRUE;
	mtr.bTemporalCompression = FALSE;
	mtr.lSampleSize          = 0;
	mtr.pUnk                 = NULL;
	mtr.formattype           = FORMAT_WaveFormatEx;
	mtr.cbFormat             = sizeof(wf);
	mtr.pbFormat             = (BYTE *)&wf;

        memset(&wf, 0, sizeof(wf));

	wf.wFormatTag = WAVE_FORMAT_PCM;
	wf.nChannels = 2;
	wf.nSamplesPerSec = 44100;
	wf.wBitsPerSample = 16;
	wf.nBlockAlign = wf.nSamplesPerSec * wf.wBitsPerSample / 8;
	wf.nAvgBytesPerSec = wf.nSamplesPerSec * wf.nBlockAlign;
	wf.cbSize = 0;

        msg_Warn( p_access, "device %s using built-in audio media type",
                 devicename.c_str() );
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	mt_count = 1;
	mt = (AM_MEDIA_TYPE *)malloc( sizeof(AM_MEDIA_TYPE)*mt_count );
	CopyMediaType(mt, &mtr);
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    }
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    /* Create and add our capture filter */
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    CaptureFilter *p_capture_filter =
        new CaptureFilter( p_access, mt, mt_count );
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    p_sys->p_graph->AddFilter( p_capture_filter, 0 );
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    /* Add the device filter to the graph (seems necessary with VfW before
     * accessing pin attributes). */
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    p_sys->p_graph->AddFilter( p_device_filter, 0 );
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    /* Attempt to connect one of this device's capture output pins */
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    msg_Dbg( p_access, "connecting filters" );
    if( ConnectFilters( p_access, p_device_filter, p_capture_filter ) )
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    {
        /* Success */
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        msg_Dbg( p_access, "filters connected successfully !" );
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        dshow_stream_t dshow_stream;
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        dshow_stream.b_pts = VLC_FALSE;
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        dshow_stream.mt =
            p_capture_filter->CustomGetPin()->CustomGetMediaType();

        /* Show properties. Done here so the VLC stream is setup with the
         * proper parameters. */
        vlc_value_t val;
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        var_Get( p_access, "dshow-config", &val );
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        if( val.i_int )
        {
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            PropertiesPage( VLC_OBJECT(p_access), p_device_filter,
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                            p_sys->p_capture_graph_builder2,
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                            dshow_stream.mt.majortype == MEDIATYPE_Audio );
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        }

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        dshow_stream.mt =
            p_capture_filter->CustomGetPin()->CustomGetMediaType();
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        dshow_stream.i_fourcc = GetFourCCFromMediaType(dshow_stream.mt);
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        if( 0 != dshow_stream.i_fourcc )
        {
            if( dshow_stream.mt.majortype == MEDIATYPE_Video )
            {
                dshow_stream.header.video =
                    *(VIDEOINFOHEADER *)dshow_stream.mt.pbFormat;

                int i_height = dshow_stream.header.video.bmiHeader.biHeight;

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                if( !dshow_stream.header.video.bmiHeader.biCompression )
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                {
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                    /* RGB DIB are coded from bottom to top */
                    i_height = - i_height;
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                }
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                /* Check if we are dealing with a DV stream */
                if( dshow_stream.i_fourcc == VLC_FOURCC('d','v','s','l') ||
                    dshow_stream.i_fourcc == VLC_FOURCC('d','v','s','d') ||
                    dshow_stream.i_fourcc == VLC_FOURCC('d','v','h','d') )
                {
                    p_access->pf_read = ReadCompressed;
                    if( !p_access->psz_demux || !*p_access->psz_demux )
                    {
                        p_access->psz_demux = strdup( "rawdv" );
                    }
                    p_sys->b_audio = VLC_FALSE;
                }
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                /* Check if we are dealing with an MPEG video stream */
                if( dshow_stream.i_fourcc == VLC_FOURCC('m','p','2','v') )
                {
                    p_access->pf_read = ReadCompressed;
                    if( !p_access->psz_demux || !*p_access->psz_demux )
                    {
                        p_access->psz_demux = "mpgv";
                    }
                    p_sys->b_audio = VLC_FALSE;
                }
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                /* Add video stream to header */
                p_sys->i_header_size += 20;
                p_sys->p_header = (uint8_t *)realloc( p_sys->p_header,
                                                      p_sys->i_header_size );
                memcpy(  &p_sys->p_header[p_sys->i_header_pos], "vids", 4 );
                memcpy(  &p_sys->p_header[p_sys->i_header_pos + 4],
                         &dshow_stream.i_fourcc, 4 );
                SetDWBE( &p_sys->p_header[p_sys->i_header_pos + 8],
                         dshow_stream.header.video.bmiHeader.biWidth );
                SetDWBE( &p_sys->p_header[p_sys->i_header_pos + 12], i_height );
                SetDWBE( &p_sys->p_header[p_sys->i_header_pos + 16], 0 );
                p_sys->i_header_pos = p_sys->i_header_size;

                /* Greatly simplifies the reading routine */
                int i_mtu = dshow_stream.header.video.bmiHeader.biWidth *
                    i_height * 4;
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                p_sys->i_mtu = __MAX( p_sys->i_mtu, i_mtu );
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            }
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            else if( dshow_stream.mt.majortype == MEDIATYPE_Audio )
            {
                dshow_stream.header.audio =
                    *(WAVEFORMATEX *)dshow_stream.mt.pbFormat;

                /* Add audio stream to header */
                p_sys->i_header_size += 20;
                p_sys->p_header = (uint8_t *)realloc( p_sys->p_header,
                                                      p_sys->i_header_size );
                memcpy(  &p_sys->p_header[p_sys->i_header_pos], "auds", 4 );
                memcpy(  &p_sys->p_header[p_sys->i_header_pos + 4],
                         &dshow_stream.i_fourcc, 4 );
                SetDWBE( &p_sys->p_header[p_sys->i_header_pos + 8],
                         dshow_stream.header.audio.nChannels );
                SetDWBE( &p_sys->p_header[p_sys->i_header_pos + 12],
                         dshow_stream.header.audio.nSamplesPerSec );
                SetDWBE( &p_sys->p_header[p_sys->i_header_pos + 16],
                         dshow_stream.header.audio.wBitsPerSample );
                p_sys->i_header_pos = p_sys->i_header_size;

                /* Greatly simplifies the reading routine */
                IAMBufferNegotiation *p_ambuf;
                IPin *p_pin;
                int i_mtu;

                p_capture_filter->CustomGetPin()->ConnectedTo( &p_pin );
                if( SUCCEEDED( p_pin->QueryInterface(
                        IID_IAMBufferNegotiation, (void **)&p_ambuf ) ) )
                {
                    ALLOCATOR_PROPERTIES AllocProp;
                    memset( &AllocProp, 0, sizeof( ALLOCATOR_PROPERTIES ) );
                    p_ambuf->GetAllocatorProperties( &AllocProp );
                    p_ambuf->Release();
                    i_mtu = AllocProp.cbBuffer;
                }
                else
                {
                    /* Worst case */
                    i_mtu = dshow_stream.header.audio.nSamplesPerSec *
                        dshow_stream.header.audio.nChannels *
                        dshow_stream.header.audio.wBitsPerSample / 8;
                }
                p_pin->Release();
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                p_sys->i_mtu = __MAX( p_sys->i_mtu, i_mtu );
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            }
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            else if( dshow_stream.mt.majortype == MEDIATYPE_Stream )
            {
                msg_Dbg( p_access, "MEDIATYPE_Stream" );
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                msg_Dbg( p_access, "selected stream pin accepts format: %4.4s",
                         (char *)&dshow_stream.i_fourcc);
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                p_sys->b_audio = VLC_FALSE;
                p_sys->i_header_size = 0;
                p_sys->i_header_pos = 0;
                p_sys->i_mtu = 0;
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                p_access->pf_read = ReadCompressed;
            }
            else
            {
                msg_Dbg( p_access, "unknown stream majortype" );
                goto fail;
            }
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            /* Add directshow elementary stream to our list */
            dshow_stream.p_device_filter = p_device_filter;
            dshow_stream.p_capture_filter = p_capture_filter;
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            p_sys->pp_streams = (dshow_stream_t **)realloc( p_sys->pp_streams,
                sizeof(dshow_stream_t *) * (p_sys->i_streams + 1) );
            p_sys->pp_streams[p_sys->i_streams] = new dshow_stream_t;
            *p_sys->pp_streams[p_sys->i_streams++] = dshow_stream;
            SetDWBE( &p_sys->p_header[4], (uint32_t)p_sys->i_streams );
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            return VLC_SUCCESS;
        }
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    }

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 fail:
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    /* Remove filters from graph */
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    p_sys->p_graph->RemoveFilter( p_device_filter );
    p_sys->p_graph->RemoveFilter( p_capture_filter );
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    /* Release objects */
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    p_device_filter->Release();
    p_capture_filter->Release();
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