jbrjake's loose pixel ratio patch.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@960 b64f7644-9d1e-0410-96f1-a4d463321fa5

3 files changed, 138 insertions, 53 deletions

diff --git a/libhb/hb.c b/libhb/hb.c
index a53bd1f4a..b2d672872 100644
--- a/libhb/hb.c
+++ b/libhb/hb.c
@@ -431,75 +431,90 @@ void hb_get_preview( hb_handle_t * h, hb_title_t * title, int picture,
  * @param job Handle to hb_job_t.
  * @param aspect Desired aspect ratio. Value of -1 uses title aspect.
  * @param pixels Maximum desired pixel count.
+ * @param par If true, skip the cropping and keep-aspect-ratio stuff.
  */
-void hb_set_size( hb_job_t * job, int aspect, int pixels )
+void hb_set_size( hb_job_t * job, int aspect, int pixels, int par )
 {
     hb_title_t * title = job->title;
 
     int croppedWidth  = title->width - title->crop[2] - title->crop[3];
     int croppedHeight = title->height - title->crop[0] - title->crop[1];
-    int croppedAspect = title->aspect * title->height * croppedWidth /
-                            croppedHeight / title->width;
-    int addCrop;
-    int i, w, h;
-
-    if( aspect <= 0 )
+   
+    int croppedAspect;
+    if (par)
     {
-        /* Keep the best possible aspect ratio */
+        /* That means we're setting size for video with non-square pixels */
+        croppedAspect = croppedWidth * HB_ASPECT_BASE / croppedHeight;
         aspect = croppedAspect;
     }
-
-    /* Crop if necessary to obtain the desired ratio */
-    memcpy( job->crop, title->crop, 4 * sizeof( int ) );
-    if( aspect < croppedAspect )
-    {
-        /* Need to crop on the left and right */
-        addCrop = croppedWidth - aspect * croppedHeight * title->width /
-                    title->aspect / title->height;
-        if( addCrop & 3 )
-        {
-            addCrop = ( addCrop + 1 ) / 2;
-            job->crop[2] += addCrop;
-            job->crop[3] += addCrop;
-        }
-        else if( addCrop & 2 )
-        {
-            addCrop /= 2;
-            job->crop[2] += addCrop - 1;
-            job->crop[3] += addCrop + 1;
-        }
-        else
-        {
-            addCrop /= 2;
-            job->crop[2] += addCrop;
-            job->crop[3] += addCrop;
-        }
-    }
-    else if( aspect > croppedAspect )
+    else
     {
-        /* Need to crop on the top and bottom */
-        addCrop = croppedHeight - croppedWidth * title->aspect *
-            title->height / aspect / title->width;
-        if( addCrop & 3 )
+        /* We're free to change cropping and maintain display aspect ratio */
+        croppedAspect = title->aspect * title->height * croppedWidth /
+            croppedHeight / title->width;
+           
+        int addCrop;
+
+        if( aspect <= 0 )
         {
-            addCrop = ( addCrop + 1 ) / 2;
-            job->crop[0] += addCrop;
-            job->crop[1] += addCrop;
+            /* Keep the best possible aspect ratio */
+            aspect = croppedAspect;
         }
-        else if( addCrop & 2 )
+
+        /* Crop if necessary to obtain the desired ratio */
+        memcpy( job->crop, title->crop, 4 * sizeof( int ) );
+        if( aspect < croppedAspect )
         {
-            addCrop /= 2;
-            job->crop[0] += addCrop - 1;
-            job->crop[1] += addCrop + 1;
+            /* Need to crop on the left and right */
+            addCrop = croppedWidth - aspect * croppedHeight * title->width /
+                        title->aspect / title->height;
+            if( addCrop & 3 )
+            {
+                addCrop = ( addCrop + 1 ) / 2;
+                job->crop[2] += addCrop;
+                job->crop[3] += addCrop;
+            }
+            else if( addCrop & 2 )
+            {
+                addCrop /= 2;
+                job->crop[2] += addCrop - 1;
+                job->crop[3] += addCrop + 1;
+            }
+            else
+            {
+                addCrop /= 2;
+                job->crop[2] += addCrop;
+                job->crop[3] += addCrop;
+            }
         }
-        else
+        else if( aspect > croppedAspect )
         {
-            addCrop /= 2;
-            job->crop[0] += addCrop;
-            job->crop[1] += addCrop;
+            /* Need to crop on the top and bottom */
+            addCrop = croppedHeight - croppedWidth * title->aspect *
+                title->height / aspect / title->width;
+            if( addCrop & 3 )
+            {
+                addCrop = ( addCrop + 1 ) / 2;
+                job->crop[0] += addCrop;
+                job->crop[1] += addCrop;
+            }
+            else if( addCrop & 2 )
+            {
+                addCrop /= 2;
+                job->crop[0] += addCrop - 1;
+                job->crop[1] += addCrop + 1;
+            }
+            else
+            {
+                addCrop /= 2;
+                job->crop[0] += addCrop;
+                job->crop[1] += addCrop;
+            }
         }
-    }
 
+    }
+   
+    int i, w, h;
     /* Compute a resolution from the number of pixels and aspect */
     for( i = 0;; i++ )
     {
diff --git a/libhb/hb.h b/libhb/hb.h
index 6f8af2aee..c33f70f62 100644
--- a/libhb/hb.h
+++ b/libhb/hb.h
@@ -77,7 +77,7 @@ hb_list_t   * hb_get_titles( hb_handle_t * );
 
 void          hb_get_preview( hb_handle_t *, hb_title_t *, int,
                               uint8_t * );
-void          hb_set_size( hb_job_t *, int ratio, int pixels );
+void          hb_set_size( hb_job_t *, int ratio, int pixels, int par );
 
 /* Handling jobs */
 int           hb_count( hb_handle_t * );
diff --git a/libhb/work.c b/libhb/work.c
index 5b3f914c2..70ca36a1e 100644
--- a/libhb/work.c
+++ b/libhb/work.c
@@ -128,6 +128,76 @@ static void do_job( hb_job_t * job, int cpu_count )
     	job->height=title->height-job->crop[0]-job->crop[1];
     	job->width=title->width-job->crop[2]-job->crop[3];
     }
+    else if ( job->pixel_ratio == 2 )
+    {
+        /* "Loose" anamorphic.
+            - Uses mod16-compliant dimensions,
+            - Allows users to set the width
+            - Handles ITU pixel aspects
+        */
+        /* Use mod16 values for better compression */
+        job->width   = MULTIPLE_16( job->width );
+        job->height  = MULTIPLE_16( job->height );
+        job->width   = MAX( 16, job->width );
+        job->height  = MAX( 16, job->height );
+
+        /* Set up some variables to make the math easier to follow. */
+        int cropped_width = title->width - job->crop[2] - job->crop[3] ;
+        int cropped_height = title->height - job->crop[0] - job->crop[1] ;
+        int storage_aspect = cropped_width * HB_ASPECT_BASE / cropped_height;
+        int pixels = job->width * (job->width / storage_aspect * HB_ASPECT_BASE);
+
+        /* While keeping the DVD storage aspect, resize the job width and height
+            so they fit into the user's specified dimensions. */
+        hb_set_size(job, -1, pixels, 1);
+
+        if (cropped_width <= 706)
+        {
+            /* Handle ITU PARs */
+            if (title->height == 480)
+            {
+                /* It's NTSC */
+                if (title->aspect == 16)
+                {
+                    /* It's widescreen */
+                    job->pixel_aspect_width = 40;
+                    job->pixel_aspect_height = 33;
+                }
+                else
+                {
+                    /*It's 4:3 */
+                    job->pixel_aspect_width = 10;
+                    job->pixel_aspect_height = 11;
+                }
+            }
+            else if (title->height == 576)
+            {
+                /* It's PAL */
+                if(title->aspect == 16)
+                {
+                    /* It's widescreen */
+                    job->pixel_aspect_width = 16;
+                    job->pixel_aspect_height = 11;
+                }
+                else
+                {
+                    /* It's 4:3 */
+                    job->pixel_aspect_width = 12;
+                    job->pixel_aspect_height = 11;
+                }
+            }
+        }
+
+        /* Figure out what dimensions the source would display at. */
+        int source_display_width = cropped_width * ((float)job->pixel_aspect_width / (float)job->pixel_aspect_height) ;
+
+        /* The film AR is the source's display width / cropped source height.
+           The output display width is the output height * film AR.
+           The output PAR is the output display width / output storage width. */
+        job->pixel_aspect_width = job->height * source_display_width / cropped_height;
+        job->pixel_aspect_height = job->width;
+
+    }
 
 	/* Keep width and height within these boundaries */
 	if (job->maxHeight && (job->height > job->maxHeight) )