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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>

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#include "common.h"
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#include "filter.h"

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/*****************************************************************************
 * Access: local prototypes
 *****************************************************************************/
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static int ReadCompressed( access_t *, byte_t *, int );
static int AccessControl ( access_t *, int, va_list );
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static int Demux       ( demux_t * );
static int DemuxControl( demux_t *, int, va_list );

static int OpenDevice( vlc_object_t *, access_sys_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( vlc_object_t *, access_sys_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 ShowPropertyPage( IUnknown * );
static void ShowDeviceProperties( vlc_object_t *, ICaptureGraphBuilder2 *, 
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                                  IBaseFilter *, vlc_bool_t );
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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  CommonOpen ( vlc_object_t *, access_sys_t *, vlc_bool_t );
static void CommonClose( vlc_object_t *, access_sys_t * );

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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( "access_demux", 0 );
    set_callbacks( DemuxOpen, DemuxClose );
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    add_submodule();
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    set_description( _("DirectShow input") );
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    add_shortcut( "dshow" );
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    set_capability( "access2", 0 );
    set_callbacks( AccessOpen, AccessClose );
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vlc_module_end();

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

    union
    {
      VIDEOINFOHEADER video;
      WAVEFORMATEX    audio;

    } header;

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    int             i_fourcc;
    es_out_id_t     *p_es;

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    vlc_bool_t      b_pts;
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} dshow_stream_t;

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/*****************************************************************************
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 * DirectShow utility functions
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 *****************************************************************************/
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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 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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/*****************************************************************************
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 * CommonOpen: open direct show device
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 *****************************************************************************/
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static int CommonOpen( vlc_object_t *p_this, access_sys_t *p_sys,
                       vlc_bool_t b_access_demux )
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{
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    vlc_value_t  val;
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    int i;
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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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    vlc_bool_t b_audio = VLC_TRUE;
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    var_Create( p_this, "dshow-config", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
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    var_Create( p_this, "dshow-vdev", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
    var_Get( p_this, "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_this, "dshow-adev", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
    var_Get( p_this, "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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    static struct {char *psz_size; int  i_width; int  i_height;} size_table[] =
    { { "subqcif", 128, 96 }, { "qsif", 160, 120 }, { "qcif", 176, 144 },
      { "sif", 320, 240 }, { "cif", 352, 288 }, { "cif", 640, 480 },
      { 0, 0, 0 },
    };

    var_Create( p_this, "dshow-size", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
    var_Get( p_this, "dshow-size", &val );
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    if( val.psz_string && *val.psz_string )
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    {
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        for( i = 0; size_table[i].psz_size; i++ )
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        {
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            if( !strcmp( val.psz_string, size_table[i].psz_size ) )
            {
                i_width = size_table[i].i_width;
                i_height = size_table[i].i_height;
                break;
            }
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        }
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        if( !size_table[i].psz_size ) /* Try to parse "WidthxHeight" */
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        {
            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_this, "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_this, "dshow-chroma", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
    var_Get( p_this, "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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    var_Create( p_this, "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->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_this, p_sys, vdevname, 0 ) != VLC_SUCCESS )
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    {
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        msg_Err( p_this, "can't open video");
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    }
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    else
    {
        /* Check if we can handle the demuxing ourselves or need to spawn
         * a demuxer module */
        dshow_stream_t *p_stream = p_sys->pp_streams[p_sys->i_streams-1];

        if( p_stream->mt.majortype == MEDIATYPE_Video )
        {
            if( /* Raw DV stream */
                p_stream->i_fourcc == VLC_FOURCC('d','v','s','l') ||
                p_stream->i_fourcc == VLC_FOURCC('d','v','s','d') ||
                p_stream->i_fourcc == VLC_FOURCC('d','v','h','d') ||
                /* Raw MPEG video stream */
                p_stream->i_fourcc == VLC_FOURCC('m','p','2','v') )
            {
                b_audio = VLC_FALSE;
            }
        }
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        if( p_stream->mt.majortype == MEDIATYPE_Stream ) b_audio = VLC_FALSE;
    }

    if( b_audio && OpenDevice( p_this, p_sys, adevname, 1 ) != VLC_SUCCESS )
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    {
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        msg_Err( p_this, "can't open audio");
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    }
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    for( i = p_sys->i_crossbar_route_depth-1; i >= 0 ; --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_this, "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_this, "Crossbar at depth %d, Routed audio "
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                            "ouput %ld to audio input %ld", i,
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                            AudioOutputIndex, AudioInputIndex );
                }
            }
        }
    }

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    /*
    ** Show properties pages from other filters in graph
    */
    var_Get( p_this, "dshow-config", &val );
    if( val.i_int )
    {
        for( i = p_sys->i_crossbar_route_depth-1; i >= 0 ; --i )
        {
            IAMCrossbar *pXbar = p_sys->crossbar_routes[i].pXbar;
            IBaseFilter *p_XF;
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            if( SUCCEEDED( pXbar->QueryInterface( IID_IBaseFilter,
                                                  (void **)&p_XF ) ) )
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            {
                ShowPropertyPage( p_XF );
                p_XF->Release();
            }
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        }
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    }

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    /* Initialize some data */
    p_sys->i_current_stream = 0;
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    vlc_mutex_init( p_this, &p_sys->lock );
    vlc_cond_init( p_this, &p_sys->wait );
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    if( !p_sys->i_streams ) return VLC_EGENERIC;
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    return VLC_SUCCESS;
}

/*****************************************************************************
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 * DemuxOpen: open direct show device as an access_demux module
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 *****************************************************************************/
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static int DemuxOpen( vlc_object_t *p_this )
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{
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    demux_t      *p_demux = (demux_t *)p_this;
    access_sys_t *p_sys;
    int i;
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    p_sys = (access_sys_t *)malloc( sizeof( access_sys_t ) );
    memset( p_sys, 0, sizeof( access_sys_t ) );
    p_demux->p_sys = (demux_sys_t *)p_sys;
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    if( CommonOpen( p_this, p_sys, VLC_TRUE ) != VLC_SUCCESS )
    {
        CommonClose( p_this, p_sys );
        return VLC_EGENERIC;
    }
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    /* Everything is ready. Let's rock baby */
    msg_Dbg( p_this, "Playing...");
    p_sys->p_control->Run();
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    p_demux->pf_demux   = Demux;
    p_demux->pf_control = DemuxControl;
    p_demux->info.i_update = 0;
    p_demux->info.i_title = 0;
    p_demux->info.i_seekpoint = 0;

    for( i = 0; i < p_sys->i_streams; i++ )
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    {
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        dshow_stream_t *p_stream = p_sys->pp_streams[i];
        es_format_t fmt;
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        if( p_stream->mt.majortype == MEDIATYPE_Video )
        {
            es_format_Init( &fmt, VIDEO_ES, p_stream->i_fourcc );
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            fmt.video.i_width  = p_stream->header.video.bmiHeader.biWidth;
            fmt.video.i_height = p_stream->header.video.bmiHeader.biHeight;
            fmt.video.i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
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            if( !p_stream->header.video.bmiHeader.biCompression )
            {
                /* RGB DIB are coded from bottom to top */
                fmt.video.i_height = (unsigned int)(-(int)fmt.video.i_height);
            }
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            /* Setup rgb mask for RGB formats */
            if( p_stream->i_fourcc == VLC_FOURCC('R','V','2','4') )
            {
                /* This is in BGR format */
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                fmt.video.i_bmask = 0x00ff0000;
                fmt.video.i_gmask = 0x0000ff00;
                fmt.video.i_rmask = 0x000000ff;
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            }
        }
        else if( p_stream->mt.majortype == MEDIATYPE_Audio )
        {
            es_format_Init( &fmt, AUDIO_ES, p_stream->i_fourcc );
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            fmt.audio.i_channels = p_stream->header.audio.nChannels;
            fmt.audio.i_rate = p_stream->header.audio.nSamplesPerSec;
            fmt.audio.i_bitspersample = p_stream->header.audio.wBitsPerSample;
            fmt.audio.i_blockalign = fmt.audio.i_channels *
                fmt.audio.i_bitspersample / 8;
            fmt.i_bitrate = fmt.audio.i_channels * fmt.audio.i_rate *
                fmt.audio.i_bitspersample;
        }

        p_stream->p_es = es_out_Add( p_demux->out, &fmt );
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    }
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    return VLC_SUCCESS;
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}

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/*****************************************************************************
 * AccessOpen: open direct show device as an access module
 *****************************************************************************/
static int AccessOpen( vlc_object_t *p_this )
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{
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    access_t     *p_access = (access_t*)p_this;
    access_sys_t *p_sys;
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    p_access->p_sys = p_sys = (access_sys_t *)malloc( sizeof( access_sys_t ) );
    memset( p_sys, 0, sizeof( access_sys_t ) );
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    if( CommonOpen( p_this, p_sys, VLC_TRUE ) != VLC_SUCCESS )
    {
        CommonClose( p_this, p_sys );
        return VLC_EGENERIC;
    }
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    dshow_stream_t *p_stream = p_sys->pp_streams[0];
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    /* Check if we need to force demuxers */
    if( !p_access->psz_demux || !*p_access->psz_demux )
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    {
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        if( p_stream->i_fourcc == VLC_FOURCC('d','v','s','l') ||
            p_stream->i_fourcc == VLC_FOURCC('d','v','s','d') ||
            p_stream->i_fourcc == VLC_FOURCC('d','v','h','d') )
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        {
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            p_access->psz_demux = strdup( "rawdv" );
        }
        else if( p_stream->i_fourcc == VLC_FOURCC('m','p','2','v') )
        {
            p_access->psz_demux = "mpgv";
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        }
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    }
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    /* Setup Access */
    p_access->pf_read = ReadCompressed;
    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;

    /* Everything is ready. Let's rock baby */
    msg_Dbg( p_this, "Playing...");
    p_sys->p_control->Run();

    return VLC_SUCCESS;
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}
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/*****************************************************************************
 * CommonClose: close device
 *****************************************************************************/
static void CommonClose( vlc_object_t *p_this, access_sys_t *p_sys )
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{
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    msg_Dbg( p_this, "Releasing DirectShow");
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    DeleteDirectShowGraph( p_sys );
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    /* Uninitialize OLE/COM */
    CoUninitialize();
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    /* Remove filters from graph */
    for( int i = 0; i < p_sys->i_streams; i++ )
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    {
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        delete p_sys->pp_streams[i];
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    }
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    free( p_sys->pp_streams );

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

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/*****************************************************************************
 * AccessClose: close device
 *****************************************************************************/
static void AccessClose( vlc_object_t *p_this )
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{
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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 */
    p_sys->p_control->Stop();
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    CommonClose( p_this, p_sys );
}
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/*****************************************************************************
 * DemuxClose: close device
 *****************************************************************************/
static void DemuxClose( vlc_object_t *p_this )
{
    demux_t      *p_demux = (demux_t *)p_this;
    access_sys_t *p_sys   = (access_sys_t *)p_demux->p_sys;
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    /* Stop capturing stuff */
    p_sys->p_control->Stop();
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    CommonClose( p_this, p_sys );
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}

/****************************************************************************
 * ConnectFilters
 ****************************************************************************/
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static bool ConnectFilters( vlc_object_t *p_this, access_sys_t *p_sys,
                            IBaseFilter *p_filter,
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                            CaptureFilter *p_capture_filter )
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{
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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->
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                RenderStream( &PIN_CATEGORY_CAPTURE, &mediaType.majortype,
                              p_filter, 0, (IBaseFilter *)p_capture_filter )) )
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        {
            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;

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            while( !Found && ( S_OK == pins->Next(1, &pP, &n) ) )
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            {
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                if( S_OK == pP->QueryPinInfo(&pinInfo) )
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                {
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                    // is this pin an ANALOGVIDEOIN input pin?
                    if( pinInfo.dir == PINDIR_INPUT &&
                        pP->QueryInterface( IID_IKsPropertySet,
                                            (void **)&pKs ) == S_OK )
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                    {
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                        if( pKs->Get( AMPROPSETID_Pin,
                                      AMPROPERTY_PIN_CATEGORY, NULL, 0,
                                      &guid, sizeof(GUID), &dw ) == S_OK )
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                        {
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                            if( guid == PIN_CATEGORY_ANALOGVIDEOIN )
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                            {
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                                // recursively search crossbar routes
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                                FindCrossbarRoutes( p_this, p_sys, pP, 0 );
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                                // found it
                                Found = TRUE;
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                            }
                        }
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                        pKs->Release();
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                    }
                    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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/*
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 * get fourcc priority from arbritary preference, the higher the better
 */
static int GetFourCCPriority( int i_fourcc )
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{
    switch( i_fourcc )
    {
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    case VLC_FOURCC('I','4','2','0'):
    case VLC_FOURCC('f','l','3','2'):
        return 9;
    case VLC_FOURCC('Y','V','1','2'):
    case VLC_FOURCC('a','r','a','w'):
        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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    }
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    return 0;
}

#define MAX_MEDIA_TYPES 32

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static int OpenDevice( vlc_object_t *p_this, access_sys_t *p_sys,
                       string devicename, vlc_bool_t b_audio )
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{
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    /* See if device is already opened */
    for( int i = 0; i < p_sys->i_streams; i++ )
    {
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        if( devicename.size() &&
            p_sys->pp_streams[i]->devicename == devicename )
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        {
            /* 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( p_this, 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_this, "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( p_this, &devicename, 0, b_audio );
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    if( p_device_filter )
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        msg_Dbg( p_this, "using device: %s", devicename.c_str() );
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    else
    {
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        msg_Err( p_this, "can't use device: %s, unsupported device type",
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                 devicename.c_str() );
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        return VLC_EGENERIC;
    }
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    size_t mt_count = 0;
    AM_MEDIA_TYPE *mt = NULL;
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    if( !b_audio )
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    {
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        // Insert prefered video media type
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        AM_MEDIA_TYPE mtr;
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        VIDEOINFOHEADER vh;

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

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        vh.bmiHeader.biSize   = sizeof(vh.bmiHeader);
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        vh.bmiHeader.biWidth  = p_sys->i_width > 0 ? p_sys->i_width : 320;
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        vh.bmiHeader.biHeight = p_sys->i_height > 0 ? p_sys->i_height : 240;
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        vh.bmiHeader.biPlanes      = 3;
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        vh.bmiHeader.biBitCount    = 12;
        vh.bmiHeader.biCompression = VLC_FOURCC('I','4','2','0');
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        vh.bmiHeader.biSizeImage   = vh.bmiHeader.biWidth * 12 *
            vh.bmiHeader.biHeight / 8;
        mtr.lSampleSize            = vh.bmiHeader.biSizeImage;
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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
    {
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        // Insert prefered audio media type
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        AM_MEDIA_TYPE mtr;
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        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;
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        memset(&wf, 0, sizeof(wf));

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        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;
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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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    // Retreive acceptable media types supported by device
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    AM_MEDIA_TYPE media_types[MAX_MEDIA_TYPES];
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    size_t media_count =
        EnumDeviceCaps( p_this, 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( media_count > 0 )
    {
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        mt = (AM_MEDIA_TYPE *)realloc( mt, sizeof(AM_MEDIA_TYPE) *
                                       (mt_count + media_count) );
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        // Order and copy returned media types according to arbitrary
        // fourcc priority
        for( size_t c = 0; c < media_count; c++ )
        {
            int slot_priority =
                GetFourCCPriority(GetFourCCFromMediaType(media_types[c]));
            size_t slot_copy = c;
            for( size_t d = c+1; d < media_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+mt_count] = media_types[slot_copy];
                media_types[slot_copy] = media_types[c];
            }
            else
            {
                mt[c+mt_count] = media_types[c];
            }
        }
        mt_count += media_count;
    }

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    /* Create and add our capture filter */
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    CaptureFilter *p_capture_filter =
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        new CaptureFilter( p_this, p_sys, 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_this, "connecting filters" );
    if( ConnectFilters( p_this, p_sys, p_device_filter, p_capture_filter ) )
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    {
        /* Success */
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        msg_Dbg( p_this, "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.p_es = 0;
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        dshow_stream.mt =
            p_capture_filter->CustomGetPin()->CustomGetMediaType();

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        /* Show Device properties. Done here so the VLC stream is setup with
         * the proper parameters. */
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        vlc_value_t val;
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        var_Get( p_this, "dshow-config", &val );
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        if( val.i_int )
        {
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            ShowDeviceProperties( p_this, p_sys->p_capture_graph_builder2,
                                  p_device_filter, b_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 );
        if( dshow_stream.i_fourcc )
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        {
            if( dshow_stream.mt.majortype == MEDIATYPE_Video )
            {
                dshow_stream.header.video =
                    *(VIDEOINFOHEADER *)dshow_stream.mt.pbFormat;
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                msg_Dbg( p_this, "MEDIATYPE_Video" );
                msg_Dbg( p_this, "selected video pin accepts format: %4.4s",
                         (char *)&dshow_stream.i_fourcc);
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            }
            else if( dshow_stream.mt.majortype == MEDIATYPE_Audio )
            {
                dshow_stream.header.audio =
                    *(WAVEFORMATEX *)dshow_stream.mt.pbFormat;
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                msg_Dbg( p_this, "MEDIATYPE_Audio" );
                msg_Dbg( p_this, "selected audio pin accepts format: %4.4s",
                         (char *)&dshow_stream.i_fourcc);
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            }
            else if( dshow_stream.mt.majortype == MEDIATYPE_Stream )
            {
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                msg_Dbg( p_this, "MEDIATYPE_Stream" );
                msg_Dbg( p_this, "selected stream pin accepts format: %4.4s",
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                         (char *)&dshow_stream.i_fourcc);
            }
            else
            {
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                msg_Dbg( p_this, "unknown stream majortype" );
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                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;
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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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    return VLC_EGENERIC;
}

static IBaseFilter *
FindCaptureDevice( vlc_object_t *p_this, string *p_devicename,
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                   list<string> *p_listdevices, vlc_bool_t b_audio )
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{
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    IBaseFilter *p_base_filter = NULL;
    IMoniker *p_moniker = NULL;
    ULONG i_fetched;
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    HRESULT hr;

    /* Create the system device enumerator */
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    ICreateDevEnum *p_dev_enum = NULL;