4 files changed, 655 insertions, 363 deletions

diff --git a/src/player/backends/direct_show.c b/src/player/backends/direct_show.c
new file mode 100644
index 0000000..d6597c0
--- /dev/null
+++ b/src/player/backends/direct_show.c
@@ -0,0 +1,463 @@
+/*
+Copyright (c) 2015
+Michał Cichoń <thedmd@interia.pl>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+/* receive/play audio stream */
+
+/* based on DShow example player */
+
+#include "config.h"
+#include "../player2_private.h"
+#define COBJMACROS
+#define INITGUID
+#include <objbase.h>
+#include <dshow.h>
+#pragma comment(lib, "strmiids.lib")
+
+# define WM_GRAPH_EVENT		(WM_APP + 1)
+
+enum { NO_GRAPH, RUNNING, PAUSED, STOPPED };
+
+static struct _player_static_t
+{
+    bool				done;
+    bool				initialized;
+    bool				hasCOM;
+} BarPlayerGlobal = { 0 };
+
+struct _player_t
+{
+    int				state;
+    IGraphBuilder*	graph;
+    IMediaControl*	control;
+    IMediaEventEx*	event;
+    IBasicAudio*	audio;
+    IMediaSeeking*  media;
+    float			volume; // dB
+    float			gain;   // dB
+};
+
+static bool DSPlayerStaticInit();
+static void DSPlayerStaticTerm(void);
+
+static bool DSPlayerStaticInit()
+{
+    if (BarPlayerGlobal.done)
+        return BarPlayerGlobal.initialized;
+
+    BarPlayerGlobal.done = true;
+
+    atexit(DSPlayerStaticTerm);
+
+    if (FAILED(CoInitializeEx(NULL, COINIT_MULTITHREADED)))
+        return false;
+
+    BarPlayerGlobal.hasCOM = true;
+
+    BarPlayerGlobal.initialized = true;
+
+    return true;
+}
+
+static void DSPlayerStaticTerm(void)
+{
+    if (!BarPlayerGlobal.done)
+        return;
+
+    if (BarPlayerGlobal.hasCOM)
+    {
+        CoUninitialize();
+        BarPlayerGlobal.hasCOM = false;
+    }
+
+    BarPlayerGlobal.initialized = false;
+    BarPlayerGlobal.done = false;
+}
+
+static void DSPlayerApplyVolume(player2_t player)
+{
+    long v = (long)((player->volume + player->gain) * 100.0f);
+
+    if (!player->audio)
+        return;
+
+    if (v < -10000)
+        v = -10000;
+    if (v > 0)
+        v = 0;
+
+    IBasicAudio_put_Volume(player->audio, v);
+}
+
+static void DSPlayerTearDown(player2_t player)
+{
+    /* TODO: send final event */
+
+    if (player->graph)
+    {
+        IGraphBuilder_Release(player->graph);
+        player->graph = NULL;
+    }
+
+    if (player->control)
+    {
+        IMediaControl_Release(player->control);
+        player->control = NULL;
+    }
+
+    if (player->event)
+    {
+        IMediaEventEx_Release(player->event);
+        player->event = NULL;
+    }
+
+    if (player->audio)
+    {
+        IBasicAudio_Release(player->audio);
+        player->audio = NULL;
+    }
+
+    if (player->media)
+    {
+        IMediaSeeking_Release(player->media);
+        player->media = NULL;
+    }
+
+    player->state = NO_GRAPH;
+}
+
+static HRESULT DSPlayerBuild(player2_t player)
+{
+    HRESULT hr;
+
+    DSPlayerTearDown(player);
+
+    hr = CoCreateInstance(&CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, &IID_IGraphBuilder, &player->graph);
+    if (FAILED(hr))
+        return hr;
+
+    hr = IGraphBuilder_QueryInterface(player->graph, &IID_IMediaControl, &player->control);
+    if (FAILED(hr))
+        return hr;
+
+    hr = IGraphBuilder_QueryInterface(player->graph, &IID_IMediaEventEx, &player->event);
+    if (FAILED(hr))
+        return hr;
+
+    hr = IGraphBuilder_QueryInterface(player->graph, &IID_IBasicAudio, &player->audio);
+    if (FAILED(hr))
+        return hr;
+
+    hr = IGraphBuilder_QueryInterface(player->graph, &IID_IMediaSeeking, &player->media);
+    if (FAILED(hr))
+        return hr;
+
+    hr = IMediaEventEx_SetNotifyWindow(player->event, (OAHWND)NULL, WM_GRAPH_EVENT, (LONG_PTR)player);
+    if (FAILED(hr))
+        return hr;
+
+    player->state = STOPPED;
+
+    return S_OK;
+}
+
+static HRESULT DSPlayerAddFilterByCLSID(IGraphBuilder *pGraph, REFGUID clsid, IBaseFilter **ppF, LPCWSTR wszName)
+{
+    IBaseFilter *pFilter = NULL;
+    HRESULT hr;
+    *ppF = 0;
+
+    hr = CoCreateInstance(clsid, NULL, CLSCTX_INPROC_SERVER, &IID_IBaseFilter, &pFilter);
+    if (FAILED(hr))
+        goto done;
+
+    hr = IGraphBuilder_AddFilter(pGraph, pFilter, wszName);
+    if (FAILED(hr))
+        goto done;
+
+    *ppF = pFilter;
+
+    IBaseFilter_AddRef(*ppF);
+
+done:
+    if (pFilter)
+        IBaseFilter_Release(pFilter);
+
+    return hr;
+}
+
+static HRESULT DSPlayerRender(player2_t player, IBaseFilter* source)
+{
+    BOOL bRenderedAnyPin = FALSE;
+
+    IPin* pin = NULL;
+    IEnumPins *enumPins = NULL;
+    IBaseFilter *audioRenderer = NULL;
+    IFilterGraph2* filter = NULL;
+
+    HRESULT hr;
+
+    hr = IGraphBuilder_QueryInterface(player->graph, &IID_IFilterGraph2, &filter);
+    if (FAILED(hr))
+        return hr;
+
+    hr = DSPlayerAddFilterByCLSID(player->graph, &CLSID_DSoundRender, &audioRenderer, L"Audio Renderer");
+    if (FAILED(hr))
+        goto done;
+
+    hr = IBaseFilter_EnumPins(source, &enumPins);
+    if (FAILED(hr))
+        goto done;
+
+    while (S_OK == IEnumPins_Next(enumPins, 1, &pin, NULL))
+    {
+        HRESULT hr2 = IFilterGraph2_RenderEx(filter, pin, AM_RENDEREX_RENDERTOEXISTINGRENDERERS, NULL);
+
+        IPin_Release(pin);
+        if (SUCCEEDED(hr2))
+            bRenderedAnyPin = TRUE;
+    }
+
+done:
+    if (enumPins)
+        IEnumPins_Release(enumPins);
+    if (enumPins)
+        IBaseFilter_Release(audioRenderer);
+    if (enumPins)
+        IFilterGraph2_Release(filter);
+
+    if (SUCCEEDED(hr) && !bRenderedAnyPin)
+        hr = VFW_E_CANNOT_RENDER;
+
+    return hr;
+}
+
+static player2_t DSPlayerCreate()
+{
+    player2_t out = NULL;
+
+    if (!DSPlayerStaticInit())
+        return NULL;
+
+    out = malloc(sizeof(struct _player_t));
+    if (!out)
+        return NULL;
+
+    memset(out, 0, sizeof(struct _player_t));
+
+    return out;
+}
+
+static void DSPlayerDestroy(player2_t player)
+{
+    DSPlayerTearDown(player);
+    free(player);
+}
+
+static void DSPlayerSetVolume(player2_t player, float volume)
+{
+    player->volume = volume;
+    DSPlayerApplyVolume(player);
+}
+
+static float DSPlayerGetVolume(player2_t player)
+{
+    return player->volume;
+}
+
+static void DSPlayerSetGain(player2_t player, float gain)
+{
+    player->gain = gain;
+    DSPlayerApplyVolume(player);
+}
+
+static float DSPlayerGetGain(player2_t player)
+{
+    return player->gain;
+}
+
+static double DSPlayerGetDuration(player2_t player)
+{
+    LONGLONG time;
+    if (SUCCEEDED(IMediaSeeking_GetDuration(player->media, &time)))
+        return time / 10000000.0;
+    else
+        return 0;
+}
+
+static double DSPlayerGetTime(player2_t player)
+{
+    LONGLONG time;
+    if (SUCCEEDED(IMediaSeeking_GetCurrentPosition(player->media, &time)))
+        return time / 10000000.0;
+    else
+        return 0;
+}
+
+static bool DSPlayerOpen(player2_t player, const char* url)
+{
+    IBaseFilter* source = NULL;
+    HRESULT hr;
+    wchar_t* wideUrl = NULL;
+    size_t urlSize;
+    int result;
+
+    hr = DSPlayerBuild(player);
+    if (FAILED(hr))
+        goto done;
+
+    urlSize = strlen(url);
+    result = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, url, urlSize, NULL, 0);
+    wideUrl = malloc((result + 1) * sizeof(wchar_t));
+    if (!wideUrl)
+    {
+        hr = E_OUTOFMEMORY;
+        goto done;
+    }
+    memset(wideUrl, 0, (result + 1) * sizeof(wchar_t));
+
+    MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, url, urlSize, wideUrl, result);
+
+    hr = IGraphBuilder_AddSourceFilter(player->graph, wideUrl, NULL, &source);
+    if (FAILED(hr))
+        goto done;
+
+    hr = DSPlayerRender(player, source);
+
+    DSPlayerApplyVolume(player);
+
+done:
+    if (wideUrl)
+        free(wideUrl);
+    if (FAILED(hr))
+        DSPlayerTearDown(player);
+    if (source)
+        IBaseFilter_Release(source);
+
+    return SUCCEEDED(hr);
+}
+
+static bool DSPlayerPlay(player2_t player)
+{
+    HRESULT hr;
+
+    if (player->state != PAUSED && player->state != STOPPED)
+        return false; /* wrong state */
+
+    hr = IMediaControl_Run(player->control);
+    if (SUCCEEDED(hr))
+        player->state = RUNNING;
+
+    return SUCCEEDED(hr);
+}
+
+static bool DSPlayerPause(player2_t player)
+{
+    HRESULT hr;
+
+    if (player->state != RUNNING)
+        return false; /* wrong state */
+
+    hr = IMediaControl_Pause(player->control);
+    if (SUCCEEDED(hr))
+        player->state = PAUSED;
+
+    return SUCCEEDED(hr);
+}
+
+static bool DSPlayerStop(player2_t player)
+{
+    HRESULT hr;
+
+    if (player->state != RUNNING && player->state != PAUSED)
+        return false; /* wrong state */
+
+    hr = IMediaControl_Stop(player->control);
+    if (SUCCEEDED(hr))
+        player->state = STOPPED;
+
+    return SUCCEEDED(hr);
+}
+
+static bool DSPlayerFinish(player2_t player)
+{
+    if (!player->control)
+        return false;
+
+    DSPlayerTearDown(player);
+    return true;
+}
+
+static bool DSPlayerIsPlaying(player2_t player)
+{
+    return player->state == RUNNING;
+}
+
+static bool DSPlayerIsPaused(player2_t player)
+{
+    return player->state == PAUSED;
+}
+
+static bool DSPlayerIsStopped(player2_t player)
+{
+    return player->state == STOPPED;
+}
+
+static bool DSPlayerIsFinished(player2_t player)
+{
+    LONGLONG time;
+    LONGLONG duration;
+
+    if (!player->media || player->state == NO_GRAPH)
+        return true;
+
+    if (player->state != RUNNING && player->state != STOPPED)
+        return false;
+
+    if (FAILED(IMediaSeeking_GetDuration(player->media, &duration)) ||
+        FAILED(IMediaSeeking_GetCurrentPosition(player->media, &time)))
+        return true;
+
+    return time >= duration;
+}
+
+player2_iface player2_direct_show =
+{
+    .Name           = "Direct Show",
+    .Create         = DSPlayerCreate,
+    .Destroy        = DSPlayerDestroy,
+    .SetVolume      = DSPlayerSetVolume,
+    .GetVolume      = DSPlayerGetVolume,
+    .SetGain        = DSPlayerSetGain,
+    .GetGain        = DSPlayerGetGain,
+    .GetDuration    = DSPlayerGetDuration,
+    .GetTime        = DSPlayerGetTime,
+    .Open           = DSPlayerOpen,
+    .Play           = DSPlayerPlay,
+    .Pause          = DSPlayerPause,
+    .Stop           = DSPlayerStop,
+    .Finish         = DSPlayerFinish,
+    .IsPlaying      = DSPlayerIsPlaying,
+    .IsPaused       = DSPlayerIsPaused,
+    .IsStopped      = DSPlayerIsStopped,
+    .IsFinished     = DSPlayerIsFinished
+};
diff --git a/src/player/player2.c b/src/player/player2.c
index 01fe33c..ed082d3 100644
--- a/src/player/player2.c
+++ b/src/player/player2.c
@@ -1,6 +1,6 @@
 /*
 Copyright (c) 2015
-	Michał Cichoń <thedmd@interia.pl>
+    Michał Cichoń <thedmd@interia.pl>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -26,384 +26,178 @@ THE SOFTWARE.
 /* based on DShow example player */
 
 #include "config.h"
-#include "player2.h"
-#define COBJMACROS
-#define INITGUID
-#include <objbase.h>
-#include <dshow.h>
-#pragma comment(lib, "strmiids.lib")
-
-# define WM_GRAPH_EVENT		(WM_APP + 1)
-
-enum { NO_GRAPH, RUNNING, PAUSED, STOPPED };
-
-static struct _player_static_t {
-	bool				done;
-	bool				initialized;
-	bool				hasCOM;
-} BarPlayerGlobal = { 0 };
-
-struct _player_t {
-	int				state;
-	IGraphBuilder*	graph;
-	IMediaControl*	control;
-	IMediaEventEx*	event;
-	IBasicAudio*	audio;
-	IMediaSeeking*  media;
-	float			volume; // dB
-	float			gain;   // dB
-};
-
-static bool BarPlayer2StaticInit();
-static void BarPlayer2StaticTerm(void);
-
-static bool BarPlayer2StaticInit () {
-	if (BarPlayerGlobal.done)
-		return BarPlayerGlobal.initialized;
-
-	BarPlayerGlobal.done = true;
-
-	atexit(BarPlayer2StaticTerm);
-
-	if (FAILED(CoInitializeEx(NULL, COINIT_MULTITHREADED)))
-		return false;
-
-	BarPlayerGlobal.hasCOM = true;
-
-	BarPlayerGlobal.initialized = true;
-
-	return true;
-}
-
-static void BarPlayer2StaticTerm(void) {
-	if (!BarPlayerGlobal.done)
-		return;
-
-	if (BarPlayerGlobal.hasCOM) {
-		CoUninitialize();
-		BarPlayerGlobal.hasCOM = false;
-	}
-
-	BarPlayerGlobal.initialized = false;
-	BarPlayerGlobal.done = false;
-}
-
-static void BarPlayer2ApplyVolume(player2_t player) {
-	long v = (long)((player->volume + player->gain) * 100.0f);
-
-	if (!player->audio)
-		return;
-
-	if (v < -10000)
-		v = -10000;
-	if (v > 0)
-		v = 0;
-
-	IBasicAudio_put_Volume(player->audio, v);
-}
-
-static void BarPlayer2TearDown(player2_t player) {
-	/* TODO: send final event */
-
-	if (player->graph) {
-		IGraphBuilder_Release(player->graph);
-		player->graph = NULL;
-	}
-
-	if (player->control) {
-		IMediaControl_Release(player->control);
-		player->control = NULL;
-	}
-
-	if (player->event) {
-		IMediaEventEx_Release(player->event);
-		player->event = NULL;
-	}
-
-	if (player->audio) {
-		IBasicAudio_Release(player->audio);
-		player->audio = NULL;
-	}
-
-	if (player->media) {
-		IMediaSeeking_Release(player->media);
-		player->media = NULL;
-	}
-
-	player->state = NO_GRAPH;
-}
-
-static HRESULT BarPlayer2Build(player2_t player) {
-	HRESULT hr;
-
-	BarPlayer2TearDown(player);
-
-	hr = CoCreateInstance(&CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, &IID_IGraphBuilder, &player->graph);
-	if (FAILED(hr))
-		return hr;
-
-	hr = IGraphBuilder_QueryInterface(player->graph, &IID_IMediaControl, &player->control);
-	if (FAILED(hr))
-		return hr;
+#include "player2_private.h"
+#include <stdlib.h>
+#include <memory.h>
 
-	hr = IGraphBuilder_QueryInterface(player->graph, &IID_IMediaEventEx, &player->event);
-	if (FAILED(hr))
-		return hr;
+# define length_of(x)   (sizeof(x)/sizeof(*(x)))
 
-	hr = IGraphBuilder_QueryInterface(player->graph, &IID_IBasicAudio, &player->audio);
-	if (FAILED(hr))
-		return hr;
-
-	hr = IGraphBuilder_QueryInterface(player->graph, &IID_IMediaSeeking, &player->media);
-	if (FAILED(hr))
-		return hr;
+static player2_iface* player2_backends[] =
+{
+    &player2_direct_show
+};
 
-	hr = IMediaEventEx_SetNotifyWindow(player->event, (OAHWND)NULL, WM_GRAPH_EVENT, (LONG_PTR)player);
-	if (FAILED(hr))
-		return hr;
+struct _player_t
+{
+    player2_iface*  backend;
+    player2_t       player;
+};
 
-	player->state = STOPPED;
+bool BarPlayer2Init(player2_t* outPlayer)
+{
+    player2_t player;
+    struct _player_t result;
+    int i;
 
-	return S_OK;
-}
+    memset(&result, 0, sizeof(struct _player_t));
 
-static HRESULT BarPlayer2AddFilterByCLSID(IGraphBuilder *pGraph, REFGUID clsid, IBaseFilter **ppF, LPCWSTR wszName) {
-	IBaseFilter *pFilter = NULL;
-	HRESULT hr;
-	*ppF = 0;
+    for (i = 0; i < length_of(player2_backends); ++i)
+    {
+        player2_iface* backend = player2_backends[i];
 
-	hr = CoCreateInstance(clsid, NULL, CLSCTX_INPROC_SERVER, &IID_IBaseFilter, &pFilter);
-	if (FAILED(hr))
-		goto done;
+        result.player = backend->Create();
+        if (result.player)
+        {
+            result.backend = backend;
+            break;
+        }
+    }
 
-	hr = IGraphBuilder_AddFilter(pGraph, pFilter, wszName);
-	if (FAILED(hr))
-		goto done;
+    if (!result.backend)
+        return false;
 
-	*ppF = pFilter;
+    player = malloc(sizeof(struct _player_t));
+    if (!player)
+        return false;
 
-	IBaseFilter_AddRef(*ppF);
+    *player = result;
 
-done:
-	if (pFilter)
-		IBaseFilter_Release(pFilter);
+    *outPlayer = player;
 
-	return hr;
+    return true;
 }
 
-static HRESULT BarPlayer2Render(player2_t player, IBaseFilter* source) {
-	BOOL bRenderedAnyPin = FALSE;
-
-	IPin* pin = NULL;
-	IEnumPins *enumPins = NULL;
-	IBaseFilter *audioRenderer = NULL;
-	IFilterGraph2* filter = NULL;
-
-	HRESULT hr;
-
-	hr = IGraphBuilder_QueryInterface(player->graph, &IID_IFilterGraph2, &filter);
-	if (FAILED(hr))
-		return hr;
-
-	hr = BarPlayer2AddFilterByCLSID(player->graph, &CLSID_DSoundRender, &audioRenderer, L"Audio Renderer");
-	if (FAILED(hr))
-		goto done;
-
-	hr = IBaseFilter_EnumPins(source, &enumPins);
-	if (FAILED(hr))
-		goto done;
-
-	while (S_OK == IEnumPins_Next(enumPins, 1, &pin, NULL))
-	{
-		HRESULT hr2 = IFilterGraph2_RenderEx(filter, pin, AM_RENDEREX_RENDERTOEXISTINGRENDERERS, NULL);
-
-		IPin_Release(pin);
-		if (SUCCEEDED(hr2))
-			bRenderedAnyPin = TRUE;
-	}
-
-done:
-	if (enumPins)
-		IEnumPins_Release(enumPins);
-	if (enumPins)
-		IBaseFilter_Release(audioRenderer);
-	if (enumPins)
-		IFilterGraph2_Release(filter);
-
-	if (SUCCEEDED(hr) && !bRenderedAnyPin)
-		hr = VFW_E_CANNOT_RENDER;
-	
-	return hr;
+void BarPlayer2Destroy(player2_t player)
+{
+    if (player->player)
+    {
+        player->backend->Destroy(player->player);
+        player->player = NULL;
+    }
 }
 
-bool BarPlayer2Init(player2_t* player) {
-
-	if (!BarPlayer2StaticInit ())
-		return false;
-
-	player2_t out = malloc(sizeof(struct _player_t));
-	if (!out)
-		return false;
-
-	memset(out, 0, sizeof(struct _player_t));
-
-	*player = out;
-
-	return true;
+void BarPlayer2SetVolume(player2_t player, float volume)
+{
+    if (player->player)
+        player->backend->SetVolume(player->player, volume);
 }
 
-void BarPlayer2Destroy(player2_t player) {
-	BarPlayer2TearDown(player);
-	free(player);
+float BarPlayer2GetVolume(player2_t player)
+{
+    if (player->player)
+        return player->backend->GetVolume(player->player);
+    else
+        return 0.0f;
 }
 
-void BarPlayer2SetVolume(player2_t player, float volume) {
-	player->volume = volume;
-	BarPlayer2ApplyVolume(player);
+void BarPlayer2SetGain(player2_t player, float gainDb)
+{
+    if (player->player)
+        player->backend->SetGain(player->player, gainDb);
 }
 
-float BarPlayer2GetVolume(player2_t player) {
-	return player->volume;
+float BarPlayer2GetGain(player2_t player)
+{
+    if (player->player)
+        return player->backend->GetGain(player->player);
+    else
+        return 0.0f;
 }
 
-void BarPlayer2SetGain(player2_t player, float gain) {
-	player->gain = gain;
-	BarPlayer2ApplyVolume(player);
+double BarPlayer2GetDuration(player2_t player)
+{
+    if (player->player)
+        return player->backend->GetDuration(player->player);
+    else
+        return 0.0f;
 }
 
-float BarPlayer2GetGain(player2_t player) {
-	return player->gain;
+double BarPlayer2GetTime(player2_t player)
+{
+    if (player->player)
+        return player->backend->GetTime(player->player);
+    else
+        return 0.0f;
 }
 
-double BarPlayer2GetDuration(player2_t player) {
-	LONGLONG time;
-	if (SUCCEEDED(IMediaSeeking_GetDuration(player->media, &time)))
-		return time / 10000000.0;
-	else
-		return 0;
+bool BarPlayer2Open(player2_t player, const char* url)
+{
+    if (player->player)
+        return player->backend->Open(player->player, url);
+    else
+        return false;
 }
 
-double BarPlayer2GetTime(player2_t player) {
-	LONGLONG time;
-	if (SUCCEEDED(IMediaSeeking_GetCurrentPosition(player->media, &time)))
-		return time / 10000000.0;
-	else
-		return 0;
+bool BarPlayer2Play(player2_t player)
+{
+    if (player->player)
+        return player->backend->Play(player->player);
+    else
+        return false;
 }
 
-bool BarPlayer2Open(player2_t player, const char* url) {
-	IBaseFilter* source = NULL;
-	HRESULT hr;
-	wchar_t* wideUrl = NULL;
-	size_t urlSize;
-	int result;
-
-	hr = BarPlayer2Build(player);
-	if (FAILED(hr))
-		goto done;
-
-	urlSize = strlen(url);
-	result = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, url, urlSize, NULL, 0);
-	wideUrl = malloc((result + 1) * sizeof(wchar_t));
-	if (!wideUrl) {
-		hr = E_OUTOFMEMORY;
-		goto done;
-	}
-	memset(wideUrl, 0, (result + 1) * sizeof(wchar_t));
-
-	MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, url, urlSize, wideUrl, result);
-
-	hr = IGraphBuilder_AddSourceFilter(player->graph, wideUrl, NULL, &source);
-	if (FAILED(hr))
-		goto done;
-
-	hr = BarPlayer2Render(player, source);
-
-	BarPlayer2ApplyVolume(player);
-
-done:
-	if (wideUrl)
-		free(wideUrl);
-	if (FAILED(hr))
-		BarPlayer2TearDown(player);
-	if (source)
-		IBaseFilter_Release(source);
-
-	return SUCCEEDED(hr);
+bool BarPlayer2Pause(player2_t player)
+{
+    if (player->player)
+        return player->backend->Pause(player->player);
+    else
+        return false;
 }
 
-bool BarPlayer2Play(player2_t player) {
-	HRESULT hr;
-
-	if (player->state != PAUSED && player->state != STOPPED)
-		return false; /* wrong state */
-
-	hr = IMediaControl_Run(player->control);
-	if (SUCCEEDED(hr))
-		player->state = RUNNING;
-
-	return SUCCEEDED(hr);
+bool BarPlayer2Stop(player2_t player)
+{
+    if (player->player)
+        return player->backend->Stop(player->player);
+    else
+        return false;
 }
 
-bool BarPlayer2Pause(player2_t player) {
-	HRESULT hr;
-
-	if (player->state != RUNNING)
-		return false; /* wrong state */
-
-	hr = IMediaControl_Pause(player->control);
-	if (SUCCEEDED(hr))
-		player->state = PAUSED;
-
-	return SUCCEEDED(hr);
+bool BarPlayer2Finish(player2_t player)
+{
+    if (player->player)
+        return player->backend->Finish(player->player);
+    else
+        return false;
 }
 
-bool BarPlayer2Stop(player2_t player) {
-	HRESULT hr;
-
-	if (player->state != RUNNING && player->state != PAUSED)
-		return false; /* wrong state */
-
-	hr = IMediaControl_Stop(player->control);
-	if (SUCCEEDED(hr))
-		player->state = STOPPED;
-
-	return SUCCEEDED(hr);
-}
-
-bool BarPlayer2Finish(player2_t player) {
-	if (!player->control)
-		return false;
-
-	BarPlayer2TearDown(player);
-	return true;
-}
-
-bool BarPlayer2IsPlaying(player2_t player) {
-	return player->state == RUNNING;
+bool BarPlayer2IsPlaying(player2_t player)
+{
+    if (player->player)
+        return player->backend->IsPlaying(player->player);
+    else
+        return false;
 }
-
-bool BarPlayer2IsPaused(player2_t player) {
-	return player->state == PAUSED;
+
+bool BarPlayer2IsPaused(player2_t player)
+{
+    if (player->player)
+        return player->backend->IsPaused(player->player);
+    else
+        return false;
 }
 
-bool BarPlayer2IsStopped(player2_t player) {
-	return player->state == STOPPED;
-}
-
-bool BarPlayer2IsFinished(player2_t player) {
-	LONGLONG time;
-	LONGLONG duration;
-
-	if (!player->media || player->state == NO_GRAPH)
-		return true;
-
-	if (player->state != RUNNING && player->state != STOPPED)
-		return false;
-
-	if (FAILED(IMediaSeeking_GetDuration(player->media, &duration)) ||
-		FAILED(IMediaSeeking_GetCurrentPosition(player->media, &time)))
-		return true;
-
-	return time >= duration;
-}
+bool BarPlayer2IsStopped(player2_t player)
+{
+    if (player->player)
+        return player->backend->IsStopped(player->player);
+    else
+        return false;
+}
+
+bool BarPlayer2IsFinished(player2_t player)
+{
+    if (player->player)
+        return player->backend->IsFinished(player->player);
+    else
+        return true;
+}
\ No newline at end of file
diff --git a/src/player/player2.h b/src/player/player2.h
index b426ee2..d50d76f 100644
--- a/src/player/player2.h
+++ b/src/player/player2.h
@@ -1,6 +1,6 @@
 /*
 Copyright (c) 2015
-	Michał Cichoń <thedmd@interia.pl>
+    Michał Cichoń <thedmd@interia.pl>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -21,8 +21,9 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */
 
-#ifndef SRC_PLAYER2_H_CN979RE9
-#define SRC_PLAYER2_H_CN979RE9
+#ifndef __PIANOBAR_PLAYER2_H__
+#define __PIANOBAR_PLAYER2_H__
+#pragma once
 
 #include "config.h"
 
@@ -30,23 +31,23 @@ THE SOFTWARE.
 
 typedef struct _player_t *player2_t;
 
-bool BarPlayer2Init (player2_t*);
-void BarPlayer2Destroy (player2_t);
-void BarPlayer2SetVolume (player2_t,float);
-float BarPlayer2GetVolume (player2_t);
-void BarPlayer2SetGain (player2_t, float);
-float BarPlayer2GetGain (player2_t);
-double BarPlayer2GetDuration (player2_t);
-double BarPlayer2GetTime (player2_t);
-bool BarPlayer2Open (player2_t, const char*);
-bool BarPlayer2Play (player2_t);
-bool BarPlayer2Pause (player2_t);
-bool BarPlayer2Stop (player2_t);
-bool BarPlayer2Finish (player2_t);
-bool BarPlayer2IsPlaying (player2_t);
-bool BarPlayer2IsPaused (player2_t);
-bool BarPlayer2IsStopped (player2_t);
-bool BarPlayer2IsFinished (player2_t);
-
-#endif /* SRC_PLAYER2_H_CN979RE9 */
+bool BarPlayer2Init(player2_t* outPlayer);
+void BarPlayer2Destroy(player2_t player);
+void BarPlayer2SetVolume(player2_t player, float volume);
+float BarPlayer2GetVolume(player2_t player);
+void BarPlayer2SetGain(player2_t player, float gainDb);
+float BarPlayer2GetGain(player2_t player);
+double BarPlayer2GetDuration(player2_t player);
+double BarPlayer2GetTime(player2_t player);
+bool BarPlayer2Open(player2_t player, const char* url);
+bool BarPlayer2Play(player2_t player);
+bool BarPlayer2Pause(player2_t player);
+bool BarPlayer2Stop(player2_t player);
+bool BarPlayer2Finish(player2_t player);
+bool BarPlayer2IsPlaying(player2_t player);
+bool BarPlayer2IsPaused(player2_t player);
+bool BarPlayer2IsStopped(player2_t player);
+bool BarPlayer2IsFinished(player2_t player);
+
+#endif /* __PIANOBAR_PLAYER2_H__ */
 
diff --git a/src/player/player2_private.h b/src/player/player2_private.h
new file mode 100644
index 0000000..054b81f
--- /dev/null
+++ b/src/player/player2_private.h
@@ -0,0 +1,34 @@
+#ifndef __PIANOBAR_PLAYER2_PRIVATE_H__
+#define __PIANOBAR_PLAYER2_PRIVATE_H__
+#pragma once
+
+#include "config.h"
+#include <stdbool.h>
+#include "player2.h"
+
+typedef struct _player2_iface
+{
+    const char*     Name;
+    player2_t     (*Create)        ();
+    void          (*Destroy)       (player2_t player);
+    void          (*SetVolume)     (player2_t player, float volume);
+    float         (*GetVolume)     (player2_t player);
+    void          (*SetGain)       (player2_t player, float gainDb);
+    float         (*GetGain)       (player2_t player);
+    double        (*GetDuration)   (player2_t player);
+    double        (*GetTime)       (player2_t player);
+    bool          (*Open)          (player2_t player, const char* url);
+    bool          (*Play)          (player2_t player);
+    bool          (*Pause)         (player2_t player);
+    bool          (*Stop)          (player2_t player);
+    bool          (*Finish)        (player2_t player);
+    bool          (*IsPlaying)     (player2_t player);
+    bool          (*IsPaused)      (player2_t player);
+    bool          (*IsStopped)     (player2_t player);
+    bool          (*IsFinished)    (player2_t player);
+} player2_iface;
+
+extern player2_iface player2_direct_show;
+extern player2_iface player2_windows_media_foundation;
+
+#endif /* __PIANOBAR_PLAYER2_PRIVATE_H__ */