svq1enc: reduce stack usage of recursively-called function.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

libavcodec/svq1enc.c

@@ -96,7 +96,7 @@ static int encode_block(SVQ1EncContext *s, uint8_t *src, uint8_t *ref,
     int w            = 2 << (level + 2 >> 1);
     int h            = 2 << (level + 1 >> 1);
     int size         = w * h;
-    DECLARE_ALIGNED(16, int16_t, block)[7][256];
+    int16_t (*block)[256] = s->encoded_block_levels[level];
     const int8_t *codebook_sum, *codebook;
     const uint16_t(*mean_vlc)[2];
     const uint8_t(*multistage_vlc)[2];

libavcodec/svq1enc.h

@@ -59,6 +59,8 @@ typedef struct SVQ1EncContext {
     int c_block_width;
     int c_block_height;
 
+    DECLARE_ALIGNED(16, int16_t, encoded_block_levels)[6][7][256];
+
     uint16_t *mb_type;
     uint32_t *dummy;
     int16_t (*motion_val8[3])[2];