[FFmpeg-cvslog] avcodec/aic: fix quantization table permutation
Michael Niedermayer
git at videolan.org
Mon Jun 23 17:56:00 CEST 2014
ffmpeg | branch: release/2.1 | Michael Niedermayer <michaelni at gmx.at> | Thu Jun 5 23:21:15 2014 +0200| [4d1346d46acc3ed035ba028954c4dc86cbb72a9b] | committer: Michael Niedermayer
avcodec/aic: fix quantization table permutation
Fixes Ticket3700
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 0a2004b6d11ff962361420c3150fe760cf1f7115)
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4d1346d46acc3ed035ba028954c4dc86cbb72a9b
---
libavcodec/aic.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/libavcodec/aic.c b/libavcodec/aic.c
index a7e3691..3963642 100644
--- a/libavcodec/aic.c
+++ b/libavcodec/aic.c
@@ -150,6 +150,7 @@ 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)
@@ -285,7 +286,7 @@ 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;
@@ -293,7 +294,7 @@ 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;
}
}
@@ -334,7 +335,7 @@ 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) {
@@ -352,7 +353,7 @@ 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]);
@@ -430,6 +431,8 @@ 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;
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