avcodec/aic: fix quantization table permutation

Fixes Ticket3700

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 7 insertions, 4 deletions

diff --git a/libavcodec/aic.c b/libavcodec/aic.c
index 373cf99..23bfa0b 100644
--- a/libavcodec/aic.c
+++ b/libavcodec/aic.c
@@ -152,6 +152,7 @@ typedef struct AICContext {
     int16_t        *data_ptr[NUM_BANDS];
 
     DECLARE_ALIGNED(16, int16_t, block)[64];
+    DECLARE_ALIGNED(16, uint8_t, quant_matrix)[64];
 } AICContext;
 
 static int aic_decode_header(AICContext *ctx, const uint8_t *src, int size)
@@ -287,7 +288,7 @@ static void recombine_block_il(int16_t *dst, const uint8_t *scan,
     }
 }
 
-static void unquant_block(int16_t *block, int q)
+static void unquant_block(int16_t *block, int q, uint8_t *quant_matrix)
 {
     int i;
 
@@ -295,7 +296,7 @@ static void unquant_block(int16_t *block, int q)
         int val  = (uint16_t)block[i];
         int sign = val & 1;
 
-        block[i] = (((val >> 1) ^ -sign) * q * aic_quant_matrix[i] >> 4)
+        block[i] = (((val >> 1) ^ -sign) * q * quant_matrix[i] >> 4)
                    + sign;
     }
 }
@@ -336,7 +337,7 @@ static int aic_decode_slice(AICContext *ctx, int mb_x, int mb_y,
             else
                 recombine_block_il(ctx->block, ctx->scantable.permutated,
                                    &base_y, &ext_y, blk);
-            unquant_block(ctx->block, ctx->quant);
+            unquant_block(ctx->block, ctx->quant, ctx->quant_matrix);
             ctx->dsp.idct(ctx->block);
 
             if (!ctx->interlaced) {
@@ -354,7 +355,7 @@ static int aic_decode_slice(AICContext *ctx, int mb_x, int mb_y,
         for (blk = 0; blk < 2; blk++) {
             recombine_block(ctx->block, ctx->scantable.permutated,
                             &base_c, &ext_c);
-            unquant_block(ctx->block, ctx->quant);
+            unquant_block(ctx->block, ctx->quant, ctx->quant_matrix);
             ctx->dsp.idct(ctx->block);
             ctx->dsp.put_signed_pixels_clamped(ctx->block, C[blk],
                                                ctx->frame->linesize[blk + 1]);
@@ -432,6 +433,8 @@ static av_cold int aic_decode_init(AVCodecContext *avctx)
     for (i = 0; i < 64; i++)
         scan[i] = i;
     ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, scan);
+    for (i = 0; i < 64; i++)
+        ctx->quant_matrix[ctx->dsp.idct_permutation[i]] = aic_quant_matrix[i];
 
     ctx->mb_width  = FFALIGN(avctx->width,  16) >> 4;
     ctx->mb_height = FFALIGN(avctx->height, 16) >> 4;