[SCM] libav/experimental: stride align cleanup

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit 3237f7318344f55a9397eeaa1e4536319c7a9987
Author: Michael Niedermayer <michaelni at gmx.at>
Date:   Tue Oct 26 12:47:56 2004 +0000

    stride align cleanup
    
    Originally committed as revision 3640 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/dsputil.h b/libavcodec/dsputil.h
index 43f113e..10c0360 100644
--- a/libavcodec/dsputil.h
+++ b/libavcodec/dsputil.h
@@ -426,6 +426,7 @@ static inline void emms(void)
 }
 
 #define __align8 __attribute__ ((aligned (8)))
+#define STRIDE_ALIGN 8
 
 void dsputil_init_mmx(DSPContext* c, AVCodecContext *avctx);
 void dsputil_init_pix_mmx(DSPContext* c, AVCodecContext *avctx);
@@ -435,6 +436,7 @@ void dsputil_init_pix_mmx(DSPContext* c, AVCodecContext *avctx);
 /* This is to use 4 bytes read to the IDCT pointers for some 'zero'
    line optimizations */
 #define __align8 __attribute__ ((aligned (4)))
+#define STRIDE_ALIGN 4
 
 void dsputil_init_armv4l(DSPContext* c, AVCodecContext *avctx);
 
@@ -442,6 +444,7 @@ void dsputil_init_armv4l(DSPContext* c, AVCodecContext *avctx);
 
 /* SPARC/VIS IDCT needs 8-byte aligned DCT blocks */
 #define __align8 __attribute__ ((aligned (8)))
+#define STRIDE_ALIGN 8
 
 void dsputil_init_mlib(DSPContext* c, AVCodecContext *avctx);
 
@@ -449,11 +452,13 @@ void dsputil_init_mlib(DSPContext* c, AVCodecContext *avctx);
 
 /* SPARC/VIS IDCT needs 8-byte aligned DCT blocks */
 #define __align8 __attribute__ ((aligned (8)))
+#define STRIDE_ALIGN 8
 void dsputil_init_vis(DSPContext* c, AVCodecContext *avctx);
 
 #elif defined(ARCH_ALPHA)
 
 #define __align8 __attribute__ ((aligned (8)))
+#define STRIDE_ALIGN 8
 
 void dsputil_init_alpha(DSPContext* c, AVCodecContext *avctx);
 
@@ -470,24 +475,28 @@ extern int mm_flags;
 #endif
 
 #define __align8 __attribute__ ((aligned (16)))
+#define STRIDE_ALIGN 16
 
 void dsputil_init_ppc(DSPContext* c, AVCodecContext *avctx);
 
 #elif defined(HAVE_MMI)
 
 #define __align8 __attribute__ ((aligned (16)))
+#define STRIDE_ALIGN 16
 
 void dsputil_init_mmi(DSPContext* c, AVCodecContext *avctx);
 
 #elif defined(ARCH_SH4)
 
 #define __align8 __attribute__ ((aligned (8)))
+#define STRIDE_ALIGN 8
 
 void dsputil_init_sh4(DSPContext* c, AVCodecContext *avctx);
 
 #else
 
-#define __align8
+#define __align8 __attribute__ ((aligned (8)))
+#define STRIDE_ALIGN 8
 
 #endif
 
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 05e63ae..6702cd1 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -219,7 +219,7 @@ int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
         buf->last_pic_num= *picture_number;
     }else{
         int h_chroma_shift, v_chroma_shift;
-        int s_align, pixel_size;
+        int pixel_size;
         
         avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
         
@@ -242,11 +242,6 @@ int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
         }
 
         avcodec_align_dimensions(s, &w, &h);
-#if defined(ARCH_POWERPC) || defined(HAVE_MMI) //FIXME some cleaner check
-        s_align= 16;
-#else
-        s_align= 8;
-#endif
             
         if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
             w+= EDGE_WIDTH*2;
@@ -260,7 +255,7 @@ int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
             const int v_shift= i==0 ? 0 : v_chroma_shift;
 
             //FIXME next ensures that linesize= 2^x uvlinesize, thats needed because some MC code assumes it
-            buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, s_align<<(h_chroma_shift-h_shift)); 
+            buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, STRIDE_ALIGN<<(h_chroma_shift-h_shift)); 
 
             buf->base[i]= av_mallocz((buf->linesize[i]*h>>v_shift)+16); //FIXME 16
             if(buf->base[i]==NULL) return -1;
@@ -269,7 +264,7 @@ int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
             if(s->flags&CODEC_FLAG_EMU_EDGE)
                 buf->data[i] = buf->base[i];
             else
-                buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), s_align);
+                buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), STRIDE_ALIGN);
         }
         pic->age= 256*256*256*64;
     }

-- 
Libav/FFmpeg packaging