From 65730f227cd79d84ceed3e0e756ab40f44d7cca3 Mon Sep 17 00:00:00 2001
From: deva <deva>
Date: Tue, 4 Jul 2006 16:31:08 +0000
Subject: Worked on the snapshot YUV 4:2:2 => RGBA conversion. It looks better
 now, but there are still something wrong with the colors!

---
 client/decoder.cc    | 39 ++++++++++++++++++++++++++++++++++-----
 client/decoder.h     |  2 +-
 client/mainwindow.cc |  2 +-
 3 files changed, 36 insertions(+), 7 deletions(-)

diff --git a/client/decoder.cc b/client/decoder.cc
index ebd5087..c1f3aab 100644
--- a/client/decoder.cc
+++ b/client/decoder.cc
@@ -159,16 +159,44 @@ void Decoder::pframeRelease()
   pmutex.unlock();
 }
 
-void Decoder::snapshot(char *rgb)
+void Decoder::snapshot(unsigned char *rgb)
 {
   /*
-  LibDVWrapper dv;
-  dv.setOutputBuffer(rgb, DV::BGR0);
+    R = Y + 1.4075 * (V - 128)
+    G = Y - (0.3455 * (U - 128) - (0.7169 * (V - 128))
+    B = Y + 1.7790 * (U - 128)
+  */
 
   pmutex.lock();
-  dv.decode(pframe);
+
+  unsigned char Y0, Y1, U, V;
+
+  unsigned int byte = 0;
+  unsigned int pos = 0;
+
+  while(pos < 720*576*4) {
+    // YUV 4:2:2 packing
+    // Y0 U0 Y1 V1 Y2 U2 Y3 V3
+    // [Y0 U0 V1] [Y1 U0 V1] [Y2 U2 V3] [Y3 U2 V3]
+
+    Y0 = pframe[byte]; byte++;
+    U = pframe[byte]; byte++;
+    Y1 = pframe[byte]; byte++;
+    V = pframe[byte]; byte++;
+
+    rgb[pos+3] = 0; // Alpha
+    rgb[pos+2] = (unsigned char)(Y0 + 1.4075 * (V - 128)); // Red
+    rgb[pos+1] = (unsigned char)(Y0 - (0.3455 * (U - 128) - (0.7169 * (V - 128)))); // Green
+    rgb[pos+0] = (unsigned char)(Y0 + 1.7790 * (U - 128)); // Blue
+    pos+=4;
+
+    rgb[pos+3] = 0; // Alpha
+    rgb[pos+2] = (unsigned char)(Y1 + 1.4075 * (V - 128)); // Red
+    rgb[pos+1] = (unsigned char)(Y1 - (0.3455 * (U - 128) - (0.7169 * (V - 128)))); // Green
+    rgb[pos+0] = (unsigned char)(Y1 + 1.7790 * (U - 128)); // Blue
+    pos+=4;
+  }
   pmutex.unlock();
-  */
 }
 
 bool Decoder::eventFilter(QObject *o, QEvent *e)
@@ -214,3 +242,4 @@ Status Decoder::status()
   
   return s;
 }
+
diff --git a/client/decoder.h b/client/decoder.h
index f156884..99cdd58 100644
--- a/client/decoder.h
+++ b/client/decoder.h
@@ -49,7 +49,7 @@ public:
 
   void run();
 
-  void snapshot(char *rgb);
+  void snapshot(unsigned char *rgb);
 
   void setPFrameData(char *pframe);
   void pframeAcquire();
diff --git a/client/mainwindow.cc b/client/mainwindow.cc
index 88eae63..79d6b7e 100644
--- a/client/mainwindow.cc
+++ b/client/mainwindow.cc
@@ -192,7 +192,7 @@ void MainWindow::snapshot_clicked()
   MIaV::control.shoot();
 
   QImage screenshot(720, 576, QImage::Format_RGB32);
-  decoder->snapshot((char*)screenshot.bits());
+  decoder->snapshot(screenshot.bits());
 
   QPixmap *p = new QPixmap();
   *p = QPixmap::fromImage(screenshot);
-- 
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