Aegisub/OverLua/avisynth.cpp

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/*
* Avisynth interface for OverLua
*
Copyright 2007 Niels Martin Hansen
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Contact:
E-mail: <jiifurusu@gmail.com>
IRC: jfs in #aegisub on irc.rizon.net
*/
// Must be included before <windows.h>, otherwise some macros from <windows.h> get in the way
#include "image.h"
#include <windows.h>
#include <string.h>
#include <memory.h>
#include "avisynth.h"
#include "overlua.h"
#include "vfr.h"
// Lots of code lifted from the CSRI avisynth.cpp
class OverLuaAvisynth : public GenericVideoFilter {
private:
OverLuaScript *script;
double spf; // seconds per frame - for frame/timestamp conversion
VFRTranslator *vfr;
public:
OverLuaAvisynth(PClip _child, IScriptEnvironment *env, const char *file, const char *datastring, const char *vfrfile)
: GenericVideoFilter(_child)
{
switch (vi.pixel_type) {
case VideoInfo::CS_BGR24:
case VideoInfo::CS_BGR32:
// safe
break;
default:
env->ThrowError("OverLua: Unsupported pixel format, only RGB formats supported");
}
try {
script = new OverLuaScript(file, datastring);
spf = (double)vi.fps_denominator / (double)vi.fps_numerator;
if (vfrfile)
vfr = GetVFRTranslator(vfrfile);
else
vfr = 0;
}
catch (const char *e) {
env->ThrowError(e);
}
catch (...) {
env->ThrowError("Unknown exception in OverLua");
}
}
~OverLuaAvisynth()
{
if (vfr)
delete vfr;
delete script;
}
PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment *env)
{
OutputDebugStringW(L"Entering OverLua GetFrame\n");
PVideoFrame avsframe = child->GetFrame(n, env);
env->MakeWritable(&avsframe);
double frametime = n * spf;
if (vfr)
frametime = vfr->TimeStampFromFrameNumber(n);
ptrdiff_t stride = avsframe->GetPitch();
unsigned char *plane = avsframe->GetWritePtr();
plane += (vi.height - 1) * stride;
stride = -stride;
try {
switch (vi.pixel_type) {
case VideoInfo::CS_BGR24: {
ImageBGR *frame = new ImageBGR(vi.width, vi.height, stride, plane);
script->RenderFrameRGB(*frame, frametime);
} break;
case VideoInfo::CS_BGR32: {
ImageBGRX *frame = new ImageBGRX(vi.width, vi.height, stride, plane);
script->RenderFrameRGB(*frame, frametime);
} break;
}
}
catch (const char *e) {
wchar_t *ew = new wchar_t[2048];
MultiByteToWideChar(CP_UTF8, 0, e, -1, ew, 2048);
MessageBoxW(0, ew, L"OverLua execution error", MB_ICONERROR);
delete[] ew;
env->ThrowError(e);
}
catch (...) {
MessageBoxW(0, L"Unknown error", L"OverLua execution error", MB_ICONERROR);
env->ThrowError("OverLua: unknown execution error");
}
OutputDebugStringW(L"Leaving OverLua GetFrame\n");
return avsframe;
}
static AVSValue __cdecl Create(AVSValue args, void* user_data, IScriptEnvironment* env)
{
return new OverLuaAvisynth(args[0].AsClip(), env, args[1].AsString(), args[2].AsString(0), args[3].AsString(0));
}
};
extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit2(IScriptEnvironment* env)
{
env->AddFunction("OverLua", "cs[data]s[vfr]s", OverLuaAvisynth::Create, 0);
return "OverLua";
}