qtcapture: better retrieval for picture sizes.

- Hopefully also fixes PAR and usage of older iSights (different fourcc)
- Note that the iSight reports itself as a 320x240 (NOT 640x480) device by default.
(cherry picked from commit ef585031b4c58db3cc333a96c6cbb6c07d85f8b5)

modules/access/qtcapture.m

@@ -171,6 +171,7 @@ static int qtchroma_to_fourcc( int i_qt )
     {
         /* Raw data types */
         { k422YpCbCr8CodecType,    VLC_FOURCC('U','Y','V','Y') },
+        { kComponentVideoCodecType,VLC_FOURCC('Y','U','Y','2') },
         { 0, 0 }
     };
     int i;
@@ -215,8 +216,6 @@ static int Open( vlc_object_t *p_this )
     memset( p_sys, 0, sizeof( demux_sys_t ) );
     memset( &fmt, 0, sizeof( es_format_t ) );    
     
-    msg_Dbg( p_demux, "QTCapture Probed" );
-
     QTCaptureDeviceInput * input = nil;
     NSError *o_returnedError;
 
@@ -252,10 +251,51 @@ static int Open( vlc_object_t *p_this )
 
     p_sys->output = [[VLCDecompressedVideoOutput alloc] init];
 
-    /* Hack - This will lower CPU consumption for some reason */
+    /* Get the formats */
+    NSArray *format_array = [p_sys->device formatDescriptions];
+    QTFormatDescription* camera_format = NULL;
+    for( int k=0; k < [format_array count]; k++ )
+    {
+        camera_format = [format_array objectAtIndex: k];
+
+        NSLog( [camera_format localizedFormatSummary] );
+        NSLog( [[camera_format formatDescriptionAttributes] description] );
+    }
+    if( [format_array count] )
+        camera_format = [format_array objectAtIndex: 0];
+    else goto error;
+
+    int qtchroma = [camera_format formatType];
+    int chroma = qtchroma_to_fourcc( qtchroma );
+    if( !chroma )
+    {
+        msg_Err( p_demux, "Unknown qt chroma %4.4s provided by camera", (char*)&qtchroma );
+        goto error;
+    }
+
+    /* Now we can init */
+    es_format_Init( &fmt, VIDEO_ES, chroma );
+
+    NSSize encoded_size = [[camera_format attributeForKey:QTFormatDescriptionVideoEncodedPixelsSizeAttribute] sizeValue];
+    NSSize display_size = [[camera_format attributeForKey:QTFormatDescriptionVideoCleanApertureDisplaySizeAttribute] sizeValue];
+    NSSize par_size = [[camera_format attributeForKey:QTFormatDescriptionVideoProductionApertureDisplaySizeAttribute] sizeValue];
+
+    fmt.video.i_width = p_sys->width = encoded_size.width;
+    fmt.video.i_height = p_sys->height = encoded_size.height;
+    if( par_size.width != encoded_size.width )
+    {
+        fmt.video.i_aspect = par_size.width * VOUT_ASPECT_FACTOR / encoded_size.width ;
+    }
+
+    NSLog( @"encoded_size %d %d", (int)encoded_size.width, (int)encoded_size.height );
+    NSLog( @"display_size %d %d", (int)display_size.width, (int)display_size.height );
+    NSLog( @"PAR size %d %d", (int)par_size.width, (int)par_size.height );
+    
     [p_sys->output setPixelBufferAttributes: [NSDictionary dictionaryWithObjectsAndKeys:
-        [NSNumber numberWithInt:480], kCVPixelBufferHeightKey,
-        [NSNumber numberWithInt:640], kCVPixelBufferWidthKey, nil]];
+        [NSNumber numberWithInt: p_sys->height], kCVPixelBufferHeightKey,
+        [NSNumber numberWithInt: p_sys->width], kCVPixelBufferWidthKey,
+        [NSNumber numberWithBool:YES], (id)kCVPixelBufferOpenGLCompatibilityKey,
+        nil]];
 
     p_sys->session = [[QTCaptureSession alloc] init];
 
@@ -275,23 +315,6 @@ static int Open( vlc_object_t *p_this )
 
     [p_sys->session startRunning];
 
-
-    int qtchroma = [[[p_sys->device formatDescriptions] objectAtIndex: 0] formatType]; /* FIXME */
-    int chroma = qtchroma_to_fourcc( qtchroma );
-    if( !chroma )
-    {
-        msg_Err( p_demux, "Unknown qt chroma %4.4s provided by camera", (char*)&qtchroma );
-        goto error;
-    }
-
-    /* Now we can init */
-
-    es_format_Init( &fmt, VIDEO_ES, chroma );
-
-    NSSize size = [[p_sys->device attributeForKey:QTFormatDescriptionVideoEncodedPixelsSizeAttribute] sizeValue];
-    p_sys->width = fmt.video.i_width = 640;/* size.width; FIXME */
-    p_sys->height = fmt.video.i_height = 480;/* size.height; FIXME */
-
     msg_Dbg( p_demux, "added new video es %4.4s %dx%d",
             (char*)&fmt.i_codec, fmt.video.i_width, fmt.video.i_height );