[Performous-commit] Tapio Vierros : Experimental webcam video recording to file.

[Lasse Kärkkäi. <tr...@us...>]

Module: performous
Branch: portaudio
Commit: 25a9da624497f21e57032f086275670647e208d1

Author: Tapio Vierros <tap...@gm...>
Date:   Sun Jun 20 18:38:23 2010 +0300

Experimental webcam video recording to file.

* No audio.
* Assumes camera captures 30 FPS (so video has most likely wrong "speed").
* Enabled/disabled via defining SAVE_WEBCAM_VIDEO macro.
* Initially enabled (in webcam.cc) only for testing purposes.
* Output to home directory, new recording overwrites previous.

---

 game/webcam.cc |   18 +++++++++++++++++-
 game/webcam.hh |    2 ++
 2 files changed, 19 insertions(+), 1 deletions(-)

diff --git a/game/webcam.cc b/game/webcam.cc
index 0dd11e1..e29ca66 100644
--- a/game/webcam.cc
+++ b/game/webcam.cc
@@ -2,14 +2,17 @@
 
 #include "webcam.hh"
 #include "xtime.hh"
+#include "fs.hh"
 
 #ifdef USE_OPENCV
 #include <cv.h>
 #include <highgui.h>
+
+#define SAVE_WEBCAM_VIDEO
 #endif
 
 Webcam::Webcam(int cam_id):
-  m_thread(), m_capture(NULL), m_frameAvailable(false), m_running(false), m_quit(false)
+  m_thread(), m_capture(NULL), m_writer(NULL), m_frameAvailable(false), m_running(false), m_quit(false)
   {
 	#ifdef USE_OPENCV
 	// Initialize the capture device
@@ -18,6 +21,17 @@ Webcam::Webcam(int cam_id):
 		std::cout << "Could not initialize webcam capturing!" << std::endl;
 		return;
 	}
+	// Initialize the video writer
+	#ifdef SAVE_WEBCAM_VIDEO
+	float fps = cvGetCaptureProperty(m_capture, CV_CAP_PROP_FPS);
+	int framew = cvGetCaptureProperty(m_capture, CV_CAP_PROP_FRAME_WIDTH);
+	int frameh = cvGetCaptureProperty(m_capture, CV_CAP_PROP_FRAME_HEIGHT);
+	int codec = CV_FOURCC('P','I','M','1'); // MPEG-1
+	std::string out_file((getHomeDir() / std::string("/performous-webcam_out.mpg")).string());
+	m_writer = cvCreateVideoWriter(out_file.c_str(), codec, fps > 0 ? fps : 30.0f, cvSize(framew,frameh));
+	if (!m_writer) std::cout << "Could not initialize webcam video saving!" << std::endl;
+	#endif
+	// Start thread
 	m_thread.reset(new boost::thread(boost::ref(*this)));
 	#else
 	++cam_id; // dummy
@@ -29,6 +43,7 @@ Webcam::~Webcam() {
 	#ifdef USE_OPENCV
 	if (m_thread) m_thread->join();
 	cvReleaseCapture(&m_capture);
+	cvReleaseVideoWriter(&m_writer);
 	#endif
 }
 
@@ -40,6 +55,7 @@ void Webcam::operator()() {
 		// Try to get a new frame
 		if (m_running) frame = cvQueryFrame(m_capture);
 		if (frame) {
+			if (m_writer) cvWriteFrame(m_writer, frame);
 			boost::mutex::scoped_lock l(m_mutex);
 			// Copy the frame to storage
 			m_frame.width = frame->width;
diff --git a/game/webcam.hh b/game/webcam.hh
index 1091c91..f63087d 100644
--- a/game/webcam.hh
+++ b/game/webcam.hh
@@ -8,6 +8,7 @@
 #include "surface.hh"
 
 struct CvCapture;
+struct CvVideoWriter;
 
 struct CamFrame {
 	int width;
@@ -39,6 +40,7 @@ class Webcam {
 	boost::scoped_ptr<boost::thread> m_thread;
 	mutable boost::mutex m_mutex;
 	CvCapture* m_capture;
+	CvVideoWriter* m_writer;
 	CamFrame m_frame;
 	Surface m_surface;
 	bool m_frameAvailable;