Better lavc/avisynth selection code (will automatically use what's available, or by option if both are)

Originally committed to SVN as r147.

core/options.cpp

@@ -153,6 +153,8 @@ void OptionsManager::LoadDefaults() {
 	SetBool(_T("Threaded Video"),false);
 	SetInt(_T("Avisynth MemoryMax"),64);
 	SetBool(_T("Allow Ancient Avisynth"),false);
+	SetBool(_T("Use ffmpeg"),false);
+
 	SetText(_T("Video resizer"),_T("BilinearResize"));
 	SetInt(_T("Video Check Script Res"), 0);
 	SetInt(_T("Video Default Zoom"), 7);

core/video_display.cpp

@@ -37,8 +37,7 @@
 ////////////
 // Includes
 #include "video_display.h"
-#include "video_provider_avs.h"
-#include "video_provider_lavc.h"
+#include "video_provider.h"
 #include "vfr.h"
 #include "ass_file.h"
 #include "ass_time.h"
@@ -140,6 +139,7 @@ void  VideoDisplay::UpdateSize() {
 ///////////////////////
 // Sets video filename
 void VideoDisplay::SetVideo(const wxString &filename) {
+	// Unload video
 	if (filename.IsEmpty()) {
 		delete provider;
 		provider = NULL;
@@ -151,20 +151,19 @@ void VideoDisplay::SetVideo(const wxString &filename) {
 		frame_n = 0;
 
 		Reset();
-	} else {
+	}
+	
+	// Load video
+	else {
 		SetVideo(_T(""));
 
 		try {
 			grid->CommitChanges(true);
 
+			// Choose a provider
 			bool usedDirectshow = false;
-
-			#ifndef USE_LAVC
-			provider = new AvisynthVideoProvider(filename,GetTempWorkFile(),zoomValue,usedDirectshow);
-			#else
-			provider = new LAVCVideoProvider(filename,GetTempWorkFile(),zoomValue);
-			#endif
-
+			provider = VideoProvider::GetProvider(filename,GetTempWorkFile());
+			
 			// Set keyframes
 			wxString ext = filename.Right(4).Lower();
 			if (ext == _T(".avi")) KeyFrames = VFWWrapper::GetKeyFrames(filename);

core/video_provider.cpp

@@ -0,0 +1,87 @@
+// Copyright (c) 2006, Rodrigo Braz Monteiro
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//   * Redistributions of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//   * Redistributions in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//   * Neither the name of the Aegisub Group nor the names of its contributors
+//     may be used to endorse or promote products derived from this software
+//     without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+// -----------------------------------------------------------------------------
+//
+// AEGISUB
+//
+// Website: http://aegisub.cellosoft.com
+// Contact: mailto:zeratul@cellosoft.com
+//
+
+
+///////////
+// Headers
+#include "video_provider_avs.h"
+#include "video_provider_lavc.h"
+#include "options.h"
+
+
+////////////////
+// Get provider
+VideoProvider *VideoProvider::GetProvider(wxString video,wxString subtitles) {
+	// Check if avisynth is available
+	bool avisynthAvailable = false;
+	#ifdef __WINDOWS__
+	try {
+		// If avisynth.dll cannot be loaded, an exception will be thrown and avisynthAvailable will never be set to true
+		AviSynthWrapper avs;
+		avisynthAvailable = true;
+	}
+	catch (...) {}
+	#endif
+
+	// Initialize to null
+	VideoProvider *provider = NULL;
+
+	// See if it's OK to use LAVC
+	#ifdef USE_LAVC
+	if (Options.AsBool(_T("Use ffmpeg"))) {
+		try {
+			provider = new LAVCVideoProvider(video,subtitles,1.0);
+		}
+		catch (...) {
+			if (avisynthAvailable) {
+				wxMessageBox(_T("Failed loading FFmpeg decoder for video, falling back to Avisynth."),_T("FFmpeg error."));
+				provider = NULL;
+			}
+
+			// Out of options, rethrow
+			else throw;
+		}
+	}
+	#endif
+
+	// Use avisynth provider
+	#ifdef __WINDOWS__
+	bool usedDirectshow = false;
+	if (!provider) provider = new AvisynthVideoProvider(video,subtitles,1.0,usedDirectshow);
+	#endif
+
+	// Return provider
+	return provider;
+}

core/video_provider.h

@@ -60,4 +60,6 @@ public:
 
 	virtual int GetSourceWidth()=0;			// Returns the original source width in pixels
 	virtual int GetSourceHeight()=0;		// Returns the original source height in pixels
+
+	static VideoProvider *GetProvider(wxString video,wxString subtitles);
 };

core/video_provider_avs.cpp

@@ -40,6 +40,9 @@
 #include "main.h"
 
 
+#ifdef __WINDOWS__
+
+
 AvisynthVideoProvider::AvisynthVideoProvider(wxString _filename, wxString _subfilename, double _zoom, bool &usedDirectshow) {
 	bool mpeg2dec3_priority = true;
 	RGB32Video = NULL;
@@ -281,3 +284,6 @@ void AvisynthVideoProvider::LoadVSFilter() {
 			throw _T("Couldn't locate VSFilter");
 	}
 }
+
+
+#endif

core/video_provider_avs.h

@@ -33,9 +33,15 @@
 // Contact: mailto:zeratul@cellosoft.com
 //
 
-#ifndef VIDEO_PROVIDER_AVS_H
-#define VIDEO_PROVIDER_AVS_H
 
+#pragma once
+
+
+///////////
+// Headers
+#include <wx/wxprec.h>
+
+#ifdef __WINDOWS__
 #include "avisynth_wrap.h"
 #include "video_provider.h"
 

core/video_provider_lavc.h

@@ -36,6 +36,15 @@
 #pragma once
 
 
+///////////////////////////////////
+// Auto-enable LAVC on non-windows
+#ifndef __WINDOWS__
+#ifndef USE_LAVC
+#define USE_LAVC
+#endif
+#endif
+
+
 ///////////
 // Headers
 #ifdef USE_LAVC