don't allocate lowres planes if they won't be used (i.e. in the 2nd pass).

git-svn-id: svn://svn.videolan.org/x264/trunk@320 df754926-b1dd-0310-bc7b-ec298dee348c

common/common.h

@@ -279,6 +279,7 @@ struct x264_t
         int i_max_ref0;
         int i_max_ref1;
         int i_delay;    /* Number of frames buffered for B reordering */
+        int b_have_lowres;  /* Whether 1/2 resolution luma planes are being used */
     } frames;
 
     /* current frame being encoded */

common/frame.c

@@ -37,6 +37,8 @@ x264_frame_t *x264_frame_new( x264_t *h )
     int i_stride;
     int i_lines;
 
+    memset( frame, 0, sizeof(x264_frame_t) );
+
     /* allocate frame data (+64 for extra data for me) */
     i_stride = ( ( h->param.i_width  + 15 )&0xfffff0 )+ 64;
     i_lines  = ( ( h->param.i_height + 15 )&0xfffff0 );
@@ -76,14 +78,17 @@ x264_frame_t *x264_frame_new( x264_t *h )
                                 frame->i_stride[0] * 32 + 32;
     }
 
-    frame->i_stride_lowres = frame->i_stride[0]/2 + 32;
-    frame->i_lines_lowres = frame->i_lines[0]/2;
-    for( i = 0; i < 4; i++ )
+    if( h->frames.b_have_lowres )
     {
-        frame->buffer[7+i] = x264_malloc( frame->i_stride_lowres *
-                                        ( frame->i_lines[0]/2 + 64 ) );
-        frame->lowres[i] = ((uint8_t*)frame->buffer[7+i]) +
-                            frame->i_stride_lowres * 32 + 32;
+        frame->i_stride_lowres = frame->i_stride[0]/2 + 32;
+        frame->i_lines_lowres = frame->i_lines[0]/2;
+        for( i = 0; i < 4; i++ )
+        {
+            frame->buffer[7+i] = x264_malloc( frame->i_stride_lowres *
+                                            ( frame->i_lines[0]/2 + 64 ) );
+            frame->lowres[i] = ((uint8_t*)frame->buffer[7+i]) +
+                                frame->i_stride_lowres * 32 + 32;
+        }
     }
 
     frame->i_poc = -1;

encoder/encoder.c

@@ -544,6 +544,8 @@ x264_t *x264_encoder_open   ( x264_param_t *param )
     h->frames.i_max_ref0 = h->param.i_frame_reference;
     h->frames.i_max_ref1 = h->sps->vui.i_num_reorder_frames;
     h->frames.i_max_dpb  = h->sps->vui.i_max_dec_frame_buffering + 1;
+    h->frames.b_have_lowres = !h->param.rc.b_stat_read
+                            && ( h->param.rc.b_cbr || h->param.b_bframe_adaptive );
 
     for( i = 0; i < X264_BFRAME_MAX + 3; i++ )
     {
@@ -1201,7 +1203,8 @@ int     x264_encoder_encode( x264_t *h,
 
         x264_frame_put( h->frames.next, fenc );
 
-        x264_frame_init_lowres( h->param.cpu, fenc );
+        if( h->frames.b_have_lowres )
+            x264_frame_init_lowres( h->param.cpu, fenc );
 
         if( h->frames.i_input <= h->frames.i_delay )
         {