From c61253adbd5bed1d7393a3153f9c865517280431 Mon Sep 17 00:00:00 2001
From: Robin Haberkorn <robin.haberkorn@googlemail.com>
Date: Wed, 3 Oct 2012 15:37:20 +0200
Subject: added video recorder based on SDL_ffmpeg

---
 src/Makefile.am  |   1 +
 src/main.cpp     |  10 ++++-
 src/recorder.cpp | 125 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/recorder.h   |  38 +++++++++++++++++
 4 files changed, 172 insertions(+), 2 deletions(-)
 create mode 100644 src/recorder.cpp
 create mode 100644 src/recorder.h

(limited to 'src')

diff --git a/src/Makefile.am b/src/Makefile.am
index 5c1a23c..3b1ba79 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -11,6 +11,7 @@ LDADD = -lsupc++
 bin_PROGRAMS = osc-graphics
 osc_graphics_SOURCES = main.cpp osc_graphics.h \
 		       osc_server.cpp osc_server.h \
+		       recorder.cpp recorder.h \
 		       layer.cpp layer.h \
 		       layer_box.cpp layer_box.h \
 		       layer_text.cpp layer_text.h \
diff --git a/src/main.cpp b/src/main.cpp
index f9c3eb8..8fd714f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -17,6 +17,7 @@
 
 #include "osc_graphics.h"
 #include "osc_server.h"
+#include "recorder.h"
 
 #include "layer.h"
 #include "layer_box.h"
@@ -50,8 +51,9 @@ static void cleanup(void);
 
 SDL_Surface *screen;
 
-OSCServer osc_server;
-LayerList layers;
+OSCServer	osc_server;
+static Recorder	recorder;
+LayerList	layers;
 
 int config_dump_osc = 0;
 
@@ -267,6 +269,8 @@ main(int argc, char **argv)
 
 	osc_server.open(port);
 
+	recorder.register_methods();
+
 	REGISTER_LAYER(LayerImage);
 	REGISTER_LAYER(LayerVideo);
 	REGISTER_LAYER(LayerBox);
@@ -282,6 +286,8 @@ main(int argc, char **argv)
 
 		layers.render(screen);
 
+		recorder.record(screen);
+
 		SDL_Flip(screen);
 		SDL_framerateDelay(&fpsm);
 	}
diff --git a/src/recorder.cpp b/src/recorder.cpp
new file mode 100644
index 0000000..13e2b13
--- /dev/null
+++ b/src/recorder.cpp
@@ -0,0 +1,125 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <SDL.h>
+#include <SDL/SDL_ffmpeg.h>
+
+#include "osc_graphics.h"
+#include "osc_server.h"
+
+#include "recorder.h"
+
+/*
+ * Macros
+ */
+#define SDL_FFMPEGFREE_SAFE(FILE) do {			\
+	if (FILE) {					\
+		SDL_ffmpegFree(FILE);			\
+		FILE = NULL;				\
+	}						\
+} while (0)
+
+#define SDL_FFMPEG_ERROR(FMT, ...) do {			\
+	fprintf(stderr, "%s(%d): " FMT ": %s\n",	\
+		__FILE__, __LINE__, ##__VA_ARGS__,	\
+		SDL_ffmpegGetError());			\
+} while (0)
+
+extern "C" {
+
+static int start_handler(const char *path, const char *types,
+		       	 lo_arg **argv, int argc,
+		       	 void *data, void *user_data);
+static int stop_handler(const char *path, const char *types,
+			lo_arg **argv, int argc,
+		       	void *data, void *user_data);
+
+}
+
+void
+Recorder::register_methods()
+{
+	osc_server.add_method("s", start_handler, this, "/recorder/start");
+	osc_server.add_method("", stop_handler, this, "/recorder/stop");
+}
+
+static int
+start_handler(const char *path, const char *types,
+	      lo_arg **argv, int argc, void *data, void *user_data)
+{
+	Recorder *obj = (Recorder *)user_data;
+
+	obj->start(&argv[0]->s);
+
+	return 0;
+}
+
+void
+Recorder::start(const char *filename)
+{
+	SDL_ffmpegCodec codec = {
+		-1,			/* video codec based on file name */
+		screen->w, screen->h,
+		1, 20 /* FIXME */,	/* framerate */
+		6000000, -1, -1,
+		-1, 0, -1, -1, -1, -1	/* no audio */
+	};
+
+	lock();
+
+	SDL_FFMPEGFREE_SAFE(file);
+
+	file = SDL_ffmpegCreate(filename);
+	if (!file) {
+		SDL_FFMPEG_ERROR("SDL_ffmpegCreate");
+		exit(EXIT_FAILURE);
+	}
+
+	SDL_ffmpegAddVideoStream(file, codec);
+	SDL_ffmpegSelectVideoStream(file, 0);
+
+	unlock();
+}
+
+static int
+stop_handler(const char *path, const char *types,
+	     lo_arg **argv, int argc, void *data, void *user_data)
+{
+	Recorder *obj = (Recorder *)user_data;
+
+	obj->stop();
+
+	return 0;
+}
+
+void
+Recorder::stop()
+{
+	lock();
+	SDL_FFMPEGFREE_SAFE(file);
+	unlock();
+}
+
+void
+Recorder::record(SDL_Surface *surf)
+{
+	lock();
+
+	if (file)
+		SDL_ffmpegAddVideoFrame(file, surf);
+
+	unlock();
+}
+
+Recorder::~Recorder()
+{
+	osc_server.del_method("s", "/recorder/start");
+	osc_server.del_method("",  "/recorder/stop");
+
+	SDL_FFMPEGFREE_SAFE(file);
+	SDL_DestroyMutex(mutex);
+}
diff --git a/src/recorder.h b/src/recorder.h
new file mode 100644
index 0000000..b2ee5e6
--- /dev/null
+++ b/src/recorder.h
@@ -0,0 +1,38 @@
+#ifndef __RECORDER_H
+#define __RECORDER_H
+
+#include <SDL.h>
+#include <SDL_thread.h>
+#include <SDL/SDL_ffmpeg.h>
+
+#include "osc_graphics.h"
+
+class Recorder {
+	SDL_ffmpegFile *file;
+
+	SDL_mutex *mutex;
+
+	inline void
+	lock()
+	{
+		SDL_LockMutex(mutex);
+	}
+	inline void
+	unlock()
+	{
+		SDL_UnlockMutex(mutex);
+	}
+
+public:
+	Recorder() : file(NULL), mutex(SDL_CreateMutex()) {}
+	~Recorder();
+
+	void register_methods();
+
+	void start(const char *filename);
+	void stop();
+
+	void record(SDL_Surface *surf);
+};
+
+#endif
-- 
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