From bd165c0254b9095bb9e5ea54def56b6404033ebe Mon Sep 17 00:00:00 2001
From: Chris Xiong <chirs241097@gmail.com>
Date: Thu, 30 Apr 2020 01:12:38 +0800
Subject: Add visualization renderer.

Add API for getting raw pitch bend values.
Fix non-compliant RPN handling.

The visualization renderer is still at the "proof-of-concept" stage.
It's not very usable (yet).
---
 visualization/renderer/qmpvisrendercore.cpp | 88 +++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 visualization/renderer/qmpvisrendercore.cpp

(limited to 'visualization/renderer/qmpvisrendercore.cpp')

diff --git a/visualization/renderer/qmpvisrendercore.cpp b/visualization/renderer/qmpvisrendercore.cpp
new file mode 100644
index 0000000..fb1a7ef
--- /dev/null
+++ b/visualization/renderer/qmpvisrendercore.cpp
@@ -0,0 +1,88 @@
+#include "qmpvisrendercore.hpp"
+#include "qmppluginapistub.hpp"
+#include "qmpsettingsro.hpp"
+#include "qmpmidiplay.hpp"
+#include "qmpcorepublic.hpp"
+
+#include <cassert>
+#include <dlfcn.h>
+
+#include <QProcess>
+#include <QDebug>
+#include <QThread>
+qmpVisRenderCore *qmpVisRenderCore::inst=nullptr;
+
+qmpVisRenderCore::qmpVisRenderCore():QObject(nullptr)
+{
+	inst=this;
+	player=new CMidiPlayer();
+	api=new qmpPluginAPIStub(this);
+	msettings=new qmpSettingsRO();
+	msettings->registerOptionEnumInt("MIDI","Text encoding","Midi/TextEncoding",{"Unicode","Big5","Big5-HKSCS","CP949","EUC-JP","EUC-KR","GB18030","KOI8-R","KOI8-U","Macintosh","Shift-JIS"},0);
+}
+
+void qmpVisRenderCore::loadVisualizationLibrary()
+{
+	mp=dlopen("libvisualization.so",RTLD_LAZY);
+	if(!mp)fprintf(stderr,"failed to load visualization module!\n");
+	GetInterface_func getintf=reinterpret_cast<GetInterface_func>(dlsym(mp,"qmpPluginGetInterface"));
+	SwitchMode_func switchmode=reinterpret_cast<SwitchMode_func>(dlsym(mp,"switchToRenderMode"));
+	vf=nullptr;
+	vp=getintf(api);
+	switchmode(&qmpVisRenderCore::framefunc,false);
+	vp->init();
+	msettings->load("/home/chrisoft/.config/qmprc");
+}
+
+void qmpVisRenderCore::unloadVisualizationLibrary()
+{
+	vp->deinit();
+	dlclose(mp);
+}
+
+void qmpVisRenderCore::setMIDIFile(const char *url)
+{
+	player->playerLoadFile(url);
+}
+
+void qmpVisRenderCore::startRender()
+{
+	assert(vf);
+	ffmpegproc=new QProcess();
+	ffmpegproc->setProgram("ffmpeg");
+	QStringList arguments;
+	arguments
+		<<"-f"<<"rawvideo"
+		<<"-pixel_format"<<"rgba"
+		<<"-video_size"<<"1600x900"
+		<<"-framerate"<<"60"
+		<<"-i"<<"pipe:";
+	arguments
+		<<"-vf"<<"vflip"
+		<<"-pix_fmt"<<"yuv420p"
+		<<"-c:v"<<"libx264"
+		<<"-preset"<<"fast"
+		<<"-crf"<<"22";
+	arguments<<"output.mp4";
+	ffmpegproc->setArguments(arguments);
+	ffmpegproc->start();
+	connect(ffmpegproc,QOverload<int,QProcess::ExitStatus>::of(&QProcess::finished),
+			[this](int x,QProcess::ExitStatus){qDebug("%d",x);qDebug()<<this->ffmpegproc->readAllStandardError();});
+	vf->show();
+	startcb(nullptr,nullptr);
+}
+
+void qmpVisRenderCore::framefunc(void *px, size_t sz)
+{
+	if(sz)
+	{
+		inst->ffmpegproc->write((const char*)px,sz);
+		while(inst->ffmpegproc->bytesToWrite()>1<<26)
+		{
+			inst->ffmpegproc->waitForBytesWritten();
+			QThread::yieldCurrentThread();
+		}
+	}
+	else
+		inst->ffmpegproc->closeWriteChannel();
+}
-- 
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