Move idct block array variable onto rtjpeg_decode_frame_yuv420 stack since

it is only used there and is only 128 byte large.
Also make it aligned to fix playback with altivec.

Originally committed as revision 6902 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/rtjpeg.c

@@ -98,6 +98,7 @@ static inline int get_block(GetBitContext *gb, DCTELEM *block, uint8_t *scan,
  */
 int rtjpeg_decode_frame_yuv420(RTJpegContext *c, AVFrame *f,
                                uint8_t *buf, int buf_size) {
+    DECLARE_ALIGNED_16(DCTELEM, block[64]);
     GetBitContext gb;
     int w = c->w / 16, h = c->h / 16;
     int x, y;
@@ -106,23 +107,23 @@ int rtjpeg_decode_frame_yuv420(RTJpegContext *c, AVFrame *f,
     init_get_bits(&gb, buf, buf_size * 8);
     for (y = 0; y < h; y++) {
         for (x = 0; x < w; x++) {
-            if (get_block(&gb, c->block, c->scan, c->lquant))
-                c->dsp->idct_put(y1, f->linesize[0], c->block);
+            if (get_block(&gb, block, c->scan, c->lquant))
+                c->dsp->idct_put(y1, f->linesize[0], block);
             y1 += 8;
-            if (get_block(&gb, c->block, c->scan, c->lquant))
-                c->dsp->idct_put(y1, f->linesize[0], c->block);
+            if (get_block(&gb, block, c->scan, c->lquant))
+                c->dsp->idct_put(y1, f->linesize[0], block);
             y1 += 8;
-            if (get_block(&gb, c->block, c->scan, c->lquant))
-                c->dsp->idct_put(y2, f->linesize[0], c->block);
+            if (get_block(&gb, block, c->scan, c->lquant))
+                c->dsp->idct_put(y2, f->linesize[0], block);
             y2 += 8;
-            if (get_block(&gb, c->block, c->scan, c->lquant))
-                c->dsp->idct_put(y2, f->linesize[0], c->block);
+            if (get_block(&gb, block, c->scan, c->lquant))
+                c->dsp->idct_put(y2, f->linesize[0], block);
             y2 += 8;
-            if (get_block(&gb, c->block, c->scan, c->cquant))
-                c->dsp->idct_put(u, f->linesize[1], c->block);
+            if (get_block(&gb, block, c->scan, c->cquant))
+                c->dsp->idct_put(u, f->linesize[1], block);
             u += 8;
-            if (get_block(&gb, c->block, c->scan, c->cquant))
-                c->dsp->idct_put(v, f->linesize[2], c->block);
+            if (get_block(&gb, block, c->scan, c->cquant))
+                c->dsp->idct_put(v, f->linesize[2], block);
             v += 8;
         }
         y1 += 2 * 8 * (f->linesize[0] - w);

libavcodec/rtjpeg.h

@@ -25,7 +25,6 @@
 typedef struct {
     int w, h;
     DSPContext *dsp;
-    DCTELEM block[64];
     uint8_t scan[64];
     uint32_t lquant[64];
     uint32_t cquant[64];