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Don't use ff_cropTbl[] for IDCT.

Browse Source 
Results of IDCT can by far outreach the range of ff_cropTbl[], leading
to overreads and potentially crashes.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
pull/3/merge
Ronald S. Bultje 13 years ago
parent 2254b559cb
commit c23acbaed4
9 changed files with 161 additions and 201 deletions
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  1. 70
      libavcodec/dsputil.c
  2. 32
      libavcodec/h264idct_template.c
  3. 15
      libavcodec/rv34dsp.c
  4. 19
      libavcodec/simple_idct.c
  5. 34
      libavcodec/simple_idct_template.c
  6. 9
      libavcodec/svq3.c
  7. 97
      libavcodec/vc1dsp.c
  8. 68
      libavcodec/vp3dsp.c
  9. 18
      libavcodec/vp8dsp.c

70
libavcodec/dsputil.c
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@ -366,18 +366,17 @@ void ff_put_pixels_clamped_c(const DCTELEM *block, uint8_t *restrict pixels,
int line_size)
{
int i;
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
/* read the pixels */
for(i=0;i<8;i++) {
pixels[0] = cm[block[0]];
pixels[1] = cm[block[1]];
pixels[2] = cm[block[2]];
pixels[3] = cm[block[3]];
pixels[4] = cm[block[4]];
pixels[5] = cm[block[5]];
pixels[6] = cm[block[6]];
pixels[7] = cm[block[7]];
pixels[0] = av_clip_uint8(block[0]);
pixels[1] = av_clip_uint8(block[1]);
pixels[2] = av_clip_uint8(block[2]);
pixels[3] = av_clip_uint8(block[3]);
pixels[4] = av_clip_uint8(block[4]);
pixels[5] = av_clip_uint8(block[5]);
pixels[6] = av_clip_uint8(block[6]);
pixels[7] = av_clip_uint8(block[7]);
pixels += line_size;
block += 8;
@ -388,14 +387,13 @@ static void put_pixels_clamped4_c(const DCTELEM *block, uint8_t *restrict pixels
int line_size)
{
int i;
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
/* read the pixels */
for(i=0;i<4;i++) {
pixels[0] = cm[block[0]];
pixels[1] = cm[block[1]];
pixels[2] = cm[block[2]];
pixels[3] = cm[block[3]];
pixels[0] = av_clip_uint8(block[0]);
pixels[1] = av_clip_uint8(block[1]);
pixels[2] = av_clip_uint8(block[2]);
pixels[3] = av_clip_uint8(block[3]);
pixels += line_size;
block += 8;
@ -406,12 +404,11 @@ static void put_pixels_clamped2_c(const DCTELEM *block, uint8_t *restrict pixels
int line_size)
{
int i;
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
/* read the pixels */
for(i=0;i<2;i++) {
pixels[0] = cm[block[0]];
pixels[1] = cm[block[1]];
pixels[0] = av_clip_uint8(block[0]);
pixels[1] = av_clip_uint8(block[1]);
pixels += line_size;
block += 8;
@ -443,18 +440,17 @@ void ff_add_pixels_clamped_c(const DCTELEM *block, uint8_t *restrict pixels,
int line_size)
{
int i;
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
/* read the pixels */
for(i=0;i<8;i++) {
pixels[0] = cm[pixels[0] + block[0]];
pixels[1] = cm[pixels[1] + block[1]];
pixels[2] = cm[pixels[2] + block[2]];
pixels[3] = cm[pixels[3] + block[3]];
pixels[4] = cm[pixels[4] + block[4]];
pixels[5] = cm[pixels[5] + block[5]];
pixels[6] = cm[pixels[6] + block[6]];
pixels[7] = cm[pixels[7] + block[7]];
pixels[0] = av_clip_uint8(pixels[0] + block[0]);
pixels[1] = av_clip_uint8(pixels[1] + block[1]);
pixels[2] = av_clip_uint8(pixels[2] + block[2]);
pixels[3] = av_clip_uint8(pixels[3] + block[3]);
pixels[4] = av_clip_uint8(pixels[4] + block[4]);
pixels[5] = av_clip_uint8(pixels[5] + block[5]);
pixels[6] = av_clip_uint8(pixels[6] + block[6]);
pixels[7] = av_clip_uint8(pixels[7] + block[7]);
pixels += line_size;
block += 8;
}
@ -464,14 +460,13 @@ static void add_pixels_clamped4_c(const DCTELEM *block, uint8_t *restrict pixels
int line_size)
{
int i;
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
/* read the pixels */
for(i=0;i<4;i++) {
pixels[0] = cm[pixels[0] + block[0]];
pixels[1] = cm[pixels[1] + block[1]];
pixels[2] = cm[pixels[2] + block[2]];
pixels[3] = cm[pixels[3] + block[3]];
pixels[0] = av_clip_uint8(pixels[0] + block[0]);
pixels[1] = av_clip_uint8(pixels[1] + block[1]);
pixels[2] = av_clip_uint8(pixels[2] + block[2]);
pixels[3] = av_clip_uint8(pixels[3] + block[3]);
pixels += line_size;
block += 8;
}
@ -481,12 +476,11 @@ static void add_pixels_clamped2_c(const DCTELEM *block, uint8_t *restrict pixels
int line_size)
{
int i;
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
/* read the pixels */
for(i=0;i<2;i++) {
pixels[0] = cm[pixels[0] + block[0]];
pixels[1] = cm[pixels[1] + block[1]];
pixels[0] = av_clip_uint8(pixels[0] + block[0]);
pixels[1] = av_clip_uint8(pixels[1] + block[1]);
pixels += line_size;
block += 8;
}
@ -2733,15 +2727,11 @@ static void ff_jref_idct2_add(uint8_t *dest, int line_size, DCTELEM *block)
static void ff_jref_idct1_put(uint8_t *dest, int line_size, DCTELEM *block)
{
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
dest[0] = cm[(block[0] + 4)>>3];
dest[0] = av_clip_uint8((block[0] + 4)>>3);
}
static void ff_jref_idct1_add(uint8_t *dest, int line_size, DCTELEM *block)
{
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
dest[0] = cm[dest[0] + ((block[0] + 4)>>3)];
dest[0] = av_clip_uint8(dest[0] + ((block[0] + 4)>>3));
}
static void just_return(void *mem av_unused, int stride av_unused, int h av_unused) { return; }

32
libavcodec/h264idct_template.c
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@ -49,7 +49,6 @@ static const uint8_t scan8[16*3]={
void FUNCC(ff_h264_idct_add)(uint8_t *_dst, DCTELEM *_block, int stride)
{
int i;
INIT_CLIP
pixel *dst = (pixel*)_dst;
dctcoef *block = (dctcoef*)_block;
stride /= sizeof(pixel);
@ -74,16 +73,15 @@ void FUNCC(ff_h264_idct_add)(uint8_t *_dst, DCTELEM *_block, int stride)
const int z2= (block[1 + 4*i]>>1) - block[3 + 4*i];
const int z3= block[1 + 4*i] + (block[3 + 4*i]>>1);
dst[i + 0*stride]= CLIP(dst[i + 0*stride] + ((z0 + z3) >> 6));
dst[i + 1*stride]= CLIP(dst[i + 1*stride] + ((z1 + z2) >> 6));
dst[i + 2*stride]= CLIP(dst[i + 2*stride] + ((z1 - z2) >> 6));
dst[i + 3*stride]= CLIP(dst[i + 3*stride] + ((z0 - z3) >> 6));
dst[i + 0*stride]= av_clip_pixel(dst[i + 0*stride] + ((z0 + z3) >> 6));
dst[i + 1*stride]= av_clip_pixel(dst[i + 1*stride] + ((z1 + z2) >> 6));
dst[i + 2*stride]= av_clip_pixel(dst[i + 2*stride] + ((z1 - z2) >> 6));
dst[i + 3*stride]= av_clip_pixel(dst[i + 3*stride] + ((z0 - z3) >> 6));
}
}
void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, DCTELEM *_block, int stride){
int i;
INIT_CLIP
pixel *dst = (pixel*)_dst;
dctcoef *block = (dctcoef*)_block;
stride /= sizeof(pixel);
@ -143,14 +141,14 @@ void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, DCTELEM *_block, int stride){
const int b5 = (a3>>2) - a5;
const int b7 = a7 - (a1>>2);
dst[i + 0*stride] = CLIP( dst[i + 0*stride] + ((b0 + b7) >> 6) );
dst[i + 1*stride] = CLIP( dst[i + 1*stride] + ((b2 + b5) >> 6) );
dst[i + 2*stride] = CLIP( dst[i + 2*stride] + ((b4 + b3) >> 6) );
dst[i + 3*stride] = CLIP( dst[i + 3*stride] + ((b6 + b1) >> 6) );
dst[i + 4*stride] = CLIP( dst[i + 4*stride] + ((b6 - b1) >> 6) );
dst[i + 5*stride] = CLIP( dst[i + 5*stride] + ((b4 - b3) >> 6) );
dst[i + 6*stride] = CLIP( dst[i + 6*stride] + ((b2 - b5) >> 6) );
dst[i + 7*stride] = CLIP( dst[i + 7*stride] + ((b0 - b7) >> 6) );
dst[i + 0*stride] = av_clip_pixel( dst[i + 0*stride] + ((b0 + b7) >> 6) );
dst[i + 1*stride] = av_clip_pixel( dst[i + 1*stride] + ((b2 + b5) >> 6) );
dst[i + 2*stride] = av_clip_pixel( dst[i + 2*stride] + ((b4 + b3) >> 6) );
dst[i + 3*stride] = av_clip_pixel( dst[i + 3*stride] + ((b6 + b1) >> 6) );
dst[i + 4*stride] = av_clip_pixel( dst[i + 4*stride] + ((b6 - b1) >> 6) );
dst[i + 5*stride] = av_clip_pixel( dst[i + 5*stride] + ((b4 - b3) >> 6) );
dst[i + 6*stride] = av_clip_pixel( dst[i + 6*stride] + ((b2 - b5) >> 6) );
dst[i + 7*stride] = av_clip_pixel( dst[i + 7*stride] + ((b0 - b7) >> 6) );
}
}
@ -158,13 +156,12 @@ void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, DCTELEM *_block, int stride){
void FUNCC(ff_h264_idct_dc_add)(uint8_t *_dst, DCTELEM *block, int stride){
int i, j;
int dc = (((dctcoef*)block)[0] + 32) >> 6;
INIT_CLIP
pixel *dst = (pixel*)_dst;
stride /= sizeof(pixel);
for( j = 0; j < 4; j++ )
{
for( i = 0; i < 4; i++ )
dst[i] = CLIP( dst[i] + dc );
dst[i] = av_clip_pixel( dst[i] + dc );
dst += stride;
}
}
@ -172,13 +169,12 @@ void FUNCC(ff_h264_idct_dc_add)(uint8_t *_dst, DCTELEM *block, int stride){
void FUNCC(ff_h264_idct8_dc_add)(uint8_t *_dst, DCTELEM *block, int stride){
int i, j;
int dc = (((dctcoef*)block)[0] + 32) >> 6;
INIT_CLIP
pixel *dst = (pixel*)_dst;
stride /= sizeof(pixel);
for( j = 0; j < 8; j++ )
{
for( i = 0; i < 8; i++ )
dst[i] = CLIP( dst[i] + dc );
dst[i] = av_clip_pixel( dst[i] + dc );
dst += stride;
}
}

15
libavcodec/rv34dsp.c
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@ -55,7 +55,6 @@ static av_always_inline void rv34_row_transform(int temp[16], DCTELEM *block)
*/
static void rv34_idct_add_c(uint8_t *dst, ptrdiff_t stride, DCTELEM *block){
int temp[16];
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
int i;
rv34_row_transform(temp, block);
@ -67,10 +66,10 @@ static void rv34_idct_add_c(uint8_t *dst, ptrdiff_t stride, DCTELEM *block){
const int z2 = 7* temp[4*1+i] - 17*temp[4*3+i];
const int z3 = 17* temp[4*1+i] + 7*temp[4*3+i];
dst[0] = cm[ dst[0] + ( (z0 + z3) >> 10 ) ];
dst[1] = cm[ dst[1] + ( (z1 + z2) >> 10 ) ];
dst[2] = cm[ dst[2] + ( (z1 - z2) >> 10 ) ];
dst[3] = cm[ dst[3] + ( (z0 - z3) >> 10 ) ];
dst[0] = av_clip_uint8( dst[0] + ( (z0 + z3) >> 10 ) );
dst[1] = av_clip_uint8( dst[1] + ( (z1 + z2) >> 10 ) );
dst[2] = av_clip_uint8( dst[2] + ( (z1 - z2) >> 10 ) );
dst[3] = av_clip_uint8( dst[3] + ( (z0 - z3) >> 10 ) );
dst += stride;
}
@ -103,15 +102,13 @@ static void rv34_inv_transform_noround_c(DCTELEM *block){
static void rv34_idct_dc_add_c(uint8_t *dst, ptrdiff_t stride, int dc)
{
const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
int i, j;
cm += (13*13*dc + 0x200) >> 10;
dc = (13*13*dc + 0x200) >> 10;
for (i = 0; i < 4; i++)
{
for (j = 0; j < 4; j++)
dst[j] = cm[ dst[j] ];
dst[j] = av_clip_uint8( dst[j] + dc );
dst += stride;
}

19
libavcodec/simple_idct.c
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@ -53,7 +53,6 @@
static inline void idct4col_put(uint8_t *dest, int line_size, const DCTELEM *col)
{
int c0, c1, c2, c3, a0, a1, a2, a3;
const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
a0 = col[8*0];
a1 = col[8*2];
@ -63,13 +62,13 @@ static inline void idct4col_put(uint8_t *dest, int line_size, const DCTELEM *col
c2 = ((a0 - a2) << (CN_SHIFT - 1)) + (1 << (C_SHIFT - 1));
c1 = a1 * C1 + a3 * C2;
c3 = a1 * C2 - a3 * C1;
dest[0] = cm[(c0 + c1) >> C_SHIFT];
dest[0] = av_clip_uint8((c0 + c1) >> C_SHIFT);
dest += line_size;
dest[0] = cm[(c2 + c3) >> C_SHIFT];
dest[0] = av_clip_uint8((c2 + c3) >> C_SHIFT);
dest += line_size;
dest[0] = cm[(c2 - c3) >> C_SHIFT];
dest[0] = av_clip_uint8((c2 - c3) >> C_SHIFT);
dest += line_size;
dest[0] = cm[(c0 - c1) >> C_SHIFT];
dest[0] = av_clip_uint8((c0 - c1) >> C_SHIFT);
}
#define BF(k) \
@ -133,7 +132,6 @@ void ff_simple_idct248_put(uint8_t *dest, int line_size, DCTELEM *block)
static inline void idct4col_add(uint8_t *dest, int line_size, const DCTELEM *col)
{
int c0, c1, c2, c3, a0, a1, a2, a3;
const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
a0 = col[8*0];
a1 = col[8*1];
@ -143,13 +141,13 @@ static inline void idct4col_add(uint8_t *dest, int line_size, const DCTELEM *col
c2 = (a0 - a2)*C3 + (1 << (C_SHIFT - 1));
c1 = a1 * C1 + a3 * C2;
c3 = a1 * C2 - a3 * C1;
dest[0] = cm[dest[0] + ((c0 + c1) >> C_SHIFT)];
dest[0] = av_clip_uint8(dest[0] + ((c0 + c1) >> C_SHIFT));
dest += line_size;
dest[0] = cm[dest[0] + ((c2 + c3) >> C_SHIFT)];
dest[0] = av_clip_uint8(dest[0] + ((c2 + c3) >> C_SHIFT));
dest += line_size;
dest[0] = cm[dest[0] + ((c2 - c3) >> C_SHIFT)];
dest[0] = av_clip_uint8(dest[0] + ((c2 - c3) >> C_SHIFT));
dest += line_size;
dest[0] = cm[dest[0] + ((c0 - c1) >> C_SHIFT)];
dest[0] = av_clip_uint8(dest[0] + ((c0 - c1) >> C_SHIFT));
}
#define RN_SHIFT 15
@ -161,7 +159,6 @@ static inline void idct4col_add(uint8_t *dest, int line_size, const DCTELEM *col
static inline void idct4row(DCTELEM *row)
{
int c0, c1, c2, c3, a0, a1, a2, a3;
//const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
a0 = row[0];
a1 = row[1];

34
libavcodec/simple_idct_template.c
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@ -224,50 +224,48 @@ static inline void FUNC(idctSparseColPut)(pixel *dest, int line_size,
DCTELEM *col)
{
int a0, a1, a2, a3, b0, b1, b2, b3;
INIT_CLIP;
IDCT_COLS;
dest[0] = CLIP((a0 + b0) >> COL_SHIFT);
dest[0] = av_clip_pixel((a0 + b0) >> COL_SHIFT);
dest += line_size;
dest[0] = CLIP((a1 + b1) >> COL_SHIFT);
dest[0] = av_clip_pixel((a1 + b1) >> COL_SHIFT);
dest += line_size;
dest[0] = CLIP((a2 + b2) >> COL_SHIFT);
dest[0] = av_clip_pixel((a2 + b2) >> COL_SHIFT);
dest += line_size;
dest[0] = CLIP((a3 + b3) >> COL_SHIFT);
dest[0] = av_clip_pixel((a3 + b3) >> COL_SHIFT);
dest += line_size;
dest[0] = CLIP((a3 - b3) >> COL_SHIFT);
dest[0] = av_clip_pixel((a3 - b3) >> COL_SHIFT);
dest += line_size;
dest[0] = CLIP((a2 - b2) >> COL_SHIFT);
dest[0] = av_clip_pixel((a2 - b2) >> COL_SHIFT);
dest += line_size;
dest[0] = CLIP((a1 - b1) >> COL_SHIFT);
dest[0] = av_clip_pixel((a1 - b1) >> COL_SHIFT);
dest += line_size;
dest[0] = CLIP((a0 - b0) >> COL_SHIFT);
dest[0] = av_clip_pixel((a0 - b0) >> COL_SHIFT);
}
static inline void FUNC(idctSparseColAdd)(pixel *dest, int line_size,
DCTELEM *col)
{
int a0, a1, a2, a3, b0, b1, b2, b3;
INIT_CLIP;
IDCT_COLS;
dest[0] = CLIP(dest[0] + ((a0 + b0) >> COL_SHIFT));
dest[0] = av_clip_pixel(dest[0] + ((a0 + b0) >> COL_SHIFT));
dest += line_size;
dest[0] = CLIP(dest[0] + ((a1 + b1) >> COL_SHIFT));
dest[0] = av_clip_pixel(dest[0] + ((a1 + b1) >> COL_SHIFT));
dest += line_size;
dest[0] = CLIP(dest[0] + ((a2 + b2) >> COL_SHIFT));
dest[0] = av_clip_pixel(dest[0] + ((a2 + b2) >> COL_SHIFT));
dest += line_size;
dest[0] = CLIP(dest[0] + ((a3 + b3) >> COL_SHIFT));
dest[0] = av_clip_pixel(dest[0] + ((a3 + b3) >> COL_SHIFT));
dest += line_size;
dest[0] = CLIP(dest[0] + ((a3 - b3) >> COL_SHIFT));
dest[0] = av_clip_pixel(dest[0] + ((a3 - b3) >> COL_SHIFT));
dest += line_size;
dest[0] = CLIP(dest[0] + ((a2 - b2) >> COL_SHIFT));
dest[0] = av_clip_pixel(dest[0] + ((a2 - b2) >> COL_SHIFT));
dest += line_size;
dest[0] = CLIP(dest[0] + ((a1 - b1) >> COL_SHIFT));
dest[0] = av_clip_pixel(dest[0] + ((a1 - b1) >> COL_SHIFT));
dest += line_size;
dest[0] = CLIP(dest[0] + ((a0 - b0) >> COL_SHIFT));
dest[0] = av_clip_pixel(dest[0] + ((a0 - b0) >> COL_SHIFT));
}
static inline void FUNC(idctSparseCol)(DCTELEM *col)

9
libavcodec/svq3.c
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@ -173,7 +173,6 @@ void ff_svq3_add_idct_c(uint8_t *dst, DCTELEM *block, int stride, int qp,
{
const int qmul = svq3_dequant_coeff[qp];
int i;
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
if (dc) {
dc = 13*13*((dc == 1) ? 1538*block[0] : ((qmul*(block[0] >> 3)) / 2));
@ -199,10 +198,10 @@ void ff_svq3_add_idct_c(uint8_t *dst, DCTELEM *block, int stride, int qp,
const int z3 = 17* block[i + 4*1] + 7*block[i + 4*3];
const int rr = (dc + 0x80000);
dst[i + stride*0] = cm[ dst[i + stride*0] + (((z0 + z3)*qmul + rr) >> 20) ];
dst[i + stride*1] = cm[ dst[i + stride*1] + (((z1 + z2)*qmul + rr) >> 20) ];
dst[i + stride*2] = cm[ dst[i + stride*2] + (((z1 - z2)*qmul + rr) >> 20) ];
dst[i + stride*3] = cm[ dst[i + stride*3] + (((z0 - z3)*qmul + rr) >> 20) ];
dst[i + stride*0] = av_clip_uint8( dst[i + stride*0] + (((z0 + z3)*qmul + rr) >> 20) );
dst[i + stride*1] = av_clip_uint8( dst[i + stride*1] + (((z1 + z2)*qmul + rr) >> 20) );
dst[i + stride*2] = av_clip_uint8( dst[i + stride*2] + (((z1 - z2)*qmul + rr) >> 20) );
dst[i + stride*3] = av_clip_uint8( dst[i + stride*3] + (((z0 - z3)*qmul + rr) >> 20) );
}
}

97
libavcodec/vc1dsp.c
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@ -139,8 +139,6 @@ static void vc1_h_s_overlap_c(DCTELEM *left, DCTELEM *right)
* @see 8.6
*/
static av_always_inline int vc1_filter_line(uint8_t* src, int stride, int pq){
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
int a0 = (2*(src[-2*stride] - src[ 1*stride]) - 5*(src[-1*stride] - src[ 0*stride]) + 4) >> 3;
int a0_sign = a0 >> 31; /* Store sign */
a0 = (a0 ^ a0_sign) - a0_sign; /* a0 = FFABS(a0); */
@ -163,8 +161,8 @@ static av_always_inline int vc1_filter_line(uint8_t* src, int stride, int pq){
else{
d = FFMIN(d, clip);
d = (d ^ d_sign) - d_sign; /* Restore sign */
src[-1*stride] = cm[src[-1*stride] - d];
src[ 0*stride] = cm[src[ 0*stride] + d];
src[-1*stride] = av_clip_uint8(src[-1*stride] - d);
src[ 0*stride] = av_clip_uint8(src[ 0*stride] + d);
}
return 1;
}
@ -234,19 +232,17 @@ static void vc1_inv_trans_8x8_dc_c(uint8_t *dest, int linesize, DCTELEM *block)
{
int i;
int dc = block[0];
const uint8_t *cm;
dc = (3 * dc + 1) >> 1;
dc = (3 * dc + 16) >> 5;
cm = ff_cropTbl + MAX_NEG_CROP + dc;
for(i = 0; i < 8; i++){
dest[0] = cm[dest[0]];
dest[1] = cm[dest[1]];
dest[2] = cm[dest[2]];
dest[3] = cm[dest[3]];
dest[4] = cm[dest[4]];
dest[5] = cm[dest[5]];
dest[6] = cm[dest[6]];
dest[7] = cm[dest[7]];
dest[0] = av_clip_uint8(dest[0] + dc);
dest[1] = av_clip_uint8(dest[1] + dc);
dest[2] = av_clip_uint8(dest[2] + dc);
dest[3] = av_clip_uint8(dest[3] + dc);
dest[4] = av_clip_uint8(dest[4] + dc);
dest[5] = av_clip_uint8(dest[5] + dc);
dest[6] = av_clip_uint8(dest[6] + dc);
dest[7] = av_clip_uint8(dest[7] + dc);
dest += linesize;
}
}
@ -326,19 +322,17 @@ static void vc1_inv_trans_8x4_dc_c(uint8_t *dest, int linesize, DCTELEM *block)
{
int i;
int dc = block[0];
const uint8_t *cm;
dc = ( 3 * dc + 1) >> 1;
dc = (17 * dc + 64) >> 7;
cm = ff_cropTbl + MAX_NEG_CROP + dc;
for(i = 0; i < 4; i++){
dest[0] = cm[dest[0]];
dest[1] = cm[dest[1]];
dest[2] = cm[dest[2]];
dest[3] = cm[dest[3]];
dest[4] = cm[dest[4]];
dest[5] = cm[dest[5]];
dest[6] = cm[dest[6]];
dest[7] = cm[dest[7]];
dest[0] = av_clip_uint8(dest[0] + dc);
dest[1] = av_clip_uint8(dest[1] + dc);
dest[2] = av_clip_uint8(dest[2] + dc);
dest[3] = av_clip_uint8(dest[3] + dc);
dest[4] = av_clip_uint8(dest[4] + dc);
dest[5] = av_clip_uint8(dest[5] + dc);
dest[6] = av_clip_uint8(dest[6] + dc);
dest[7] = av_clip_uint8(dest[7] + dc);
dest += linesize;
}
}
@ -348,7 +342,6 @@ static void vc1_inv_trans_8x4_c(uint8_t *dest, int linesize, DCTELEM *block)
int i;
register int t1,t2,t3,t4,t5,t6,t7,t8;
DCTELEM *src, *dst;
const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
src = block;
dst = block;
@ -388,10 +381,10 @@ static void vc1_inv_trans_8x4_c(uint8_t *dest, int linesize, DCTELEM *block)
t3 = 22 * src[ 8] + 10 * src[24];
t4 = 22 * src[24] - 10 * src[ 8];
dest[0*linesize] = cm[dest[0*linesize] + ((t1 + t3) >> 7)];
dest[1*linesize] = cm[dest[1*linesize] + ((t2 - t4) >> 7)];
dest[2*linesize] = cm[dest[2*linesize] + ((t2 + t4) >> 7)];
dest[3*linesize] = cm[dest[3*linesize] + ((t1 - t3) >> 7)];
dest[0*linesize] = av_clip_uint8(dest[0*linesize] + ((t1 + t3) >> 7));
dest[1*linesize] = av_clip_uint8(dest[1*linesize] + ((t2 - t4) >> 7));
dest[2*linesize] = av_clip_uint8(dest[2*linesize] + ((t2 + t4) >> 7));
dest[3*linesize] = av_clip_uint8(dest[3*linesize] + ((t1 - t3) >> 7));
src ++;
dest++;
@ -404,15 +397,13 @@ static void vc1_inv_trans_4x8_dc_c(uint8_t *dest, int linesize, DCTELEM *block)
{
int i;
int dc = block[0];
const uint8_t *cm;
dc = (17 * dc + 4) >> 3;
dc = (12 * dc + 64) >> 7;
cm = ff_cropTbl + MAX_NEG_CROP + dc;
for(i = 0; i < 8; i++){
dest[0] = cm[dest[0]];
dest[1] = cm[dest[1]];
dest[2] = cm[dest[2]];
dest[3] = cm[dest[3]];
dest[0] = av_clip_uint8(dest[0] + dc);
dest[1] = av_clip_uint8(dest[1] + dc);
dest[2] = av_clip_uint8(dest[2] + dc);
dest[3] = av_clip_uint8(dest[3] + dc);
dest += linesize;
}
}
@ -422,7 +413,6 @@ static void vc1_inv_trans_4x8_c(uint8_t *dest, int linesize, DCTELEM *block)
int i;
register int t1,t2,t3,t4,t5,t6,t7,t8;
DCTELEM *src, *dst;
const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
src = block;
dst = block;
@ -458,14 +448,14 @@ static void vc1_inv_trans_4x8_c(uint8_t *dest, int linesize, DCTELEM *block)
t3 = 9 * src[ 8] - 16 * src[24] + 4 * src[40] + 15 * src[56];
t4 = 4 * src[ 8] - 9 * src[24] + 15 * src[40] - 16 * src[56];
dest[0*linesize] = cm[dest[0*linesize] + ((t5 + t1) >> 7)];
dest[1*linesize] = cm[dest[1*linesize] + ((t6 + t2) >> 7)];
dest[2*linesize] = cm[dest[2*linesize] + ((t7 + t3) >> 7)];
dest[3*linesize] = cm[dest[3*linesize] + ((t8 + t4) >> 7)];
dest[4*linesize] = cm[dest[4*linesize] + ((t8 - t4 + 1) >> 7)];
dest[5*linesize] = cm[dest[5*linesize] + ((t7 - t3 + 1) >> 7)];
dest[6*linesize] = cm[dest[6*linesize] + ((t6 - t2 + 1) >> 7)];
dest[7*linesize] = cm[dest[7*linesize] + ((t5 - t1 + 1) >> 7)];
dest[0*linesize] = av_clip_uint8(dest[0*linesize] + ((t5 + t1) >> 7));
dest[1*linesize] = av_clip_uint8(dest[1*linesize] + ((t6 + t2) >> 7));
dest[2*linesize] = av_clip_uint8(dest[2*linesize] + ((t7 + t3) >> 7));
dest[3*linesize] = av_clip_uint8(dest[3*linesize] + ((t8 + t4) >> 7));
dest[4*linesize] = av_clip_uint8(dest[4*linesize] + ((t8 - t4 + 1) >> 7));
dest[5*linesize] = av_clip_uint8(dest[5*linesize] + ((t7 - t3 + 1) >> 7));
dest[6*linesize] = av_clip_uint8(dest[6*linesize] + ((t6 - t2 + 1) >> 7));
dest[7*linesize] = av_clip_uint8(dest[7*linesize] + ((t5 - t1 + 1) >> 7));
src ++;
dest++;
@ -478,15 +468,13 @@ static void vc1_inv_trans_4x4_dc_c(uint8_t *dest, int linesize, DCTELEM *block)
{
int i;
int dc = block[0];
const uint8_t *cm;
dc = (17 * dc + 4) >> 3;
dc = (17 * dc + 64) >> 7;
cm = ff_cropTbl + MAX_NEG_CROP + dc;
for(i = 0; i < 4; i++){
dest[0] = cm[dest[0]];
dest[1] = cm[dest[1]];
dest[2] = cm[dest[2]];
dest[3] = cm[dest[3]];
dest[0] = av_clip_uint8(dest[0] + dc);
dest[1] = av_clip_uint8(dest[1] + dc);
dest[2] = av_clip_uint8(dest[2] + dc);
dest[3] = av_clip_uint8(dest[3] + dc);
dest += linesize;
}
}
@ -496,7 +484,6 @@ static void vc1_inv_trans_4x4_c(uint8_t *dest, int linesize, DCTELEM *block)
int i;
register int t1,t2,t3,t4;
DCTELEM *src, *dst;
const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
src = block;
dst = block;
@ -522,10 +509,10 @@ static void vc1_inv_trans_4x4_c(uint8_t *dest, int linesize, DCTELEM *block)
t3 = 22 * src[ 8] + 10 * src[24];
t4 = 22 * src[24] - 10 * src[ 8];
dest[0*linesize] = cm[dest[0*linesize] + ((t1 + t3) >> 7)];
dest[1*linesize] = cm[dest[1*linesize] + ((t2 - t4) >> 7)];
dest[2*linesize] = cm[dest[2*linesize] + ((t2 + t4) >> 7)];
dest[3*linesize] = cm[dest[3*linesize] + ((t1 - t3) >> 7)];
dest[0*linesize] = av_clip_uint8(dest[0*linesize] + ((t1 + t3) >> 7));
dest[1*linesize] = av_clip_uint8(dest[1*linesize] + ((t2 - t4) >> 7));
dest[2*linesize] = av_clip_uint8(dest[2*linesize] + ((t2 + t4) >> 7));
dest[3*linesize] = av_clip_uint8(dest[3*linesize] + ((t1 - t3) >> 7));
src ++;
dest++;

68
libavcodec/vp3dsp.c
Unescape View File

@ -41,7 +41,6 @@
static av_always_inline void idct(uint8_t *dst, int stride, int16_t *input, int type)
{
int16_t *ip = input;
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
int A, B, C, D, Ad, Bd, Cd, Dd, E, F, G, H;
int Ed, Gd, Add, Bdd, Fd, Hd;
@ -147,29 +146,29 @@ static av_always_inline void idct(uint8_t *dst, int stride, int16_t *input, int
ip[5*8] = (Fd + Bdd ) >> 4;
ip[6*8] = (Fd - Bdd ) >> 4;
}else if(type==1){
dst[0*stride] = cm[(Gd + Cd ) >> 4];
dst[7*stride] = cm[(Gd - Cd ) >> 4];
dst[0*stride] = av_clip_uint8((Gd + Cd ) >> 4);
dst[7*stride] = av_clip_uint8((Gd - Cd ) >> 4);
dst[1*stride] = cm[(Add + Hd ) >> 4];
dst[2*stride] = cm[(Add - Hd ) >> 4];
dst[1*stride] = av_clip_uint8((Add + Hd ) >> 4);
dst[2*stride] = av_clip_uint8((Add - Hd ) >> 4);
dst[3*stride] = cm[(Ed + Dd ) >> 4];
dst[4*stride] = cm[(Ed - Dd ) >> 4];
dst[3*stride] = av_clip_uint8((Ed + Dd ) >> 4);
dst[4*stride] = av_clip_uint8((Ed - Dd ) >> 4);
dst[5*stride] = cm[(Fd + Bdd ) >> 4];
dst[6*stride] = cm[(Fd - Bdd ) >> 4];
dst[5*stride] = av_clip_uint8((Fd + Bdd ) >> 4);
dst[6*stride] = av_clip_uint8((Fd - Bdd ) >> 4);
}else{
dst[0*stride] = cm[dst[0*stride] + ((Gd + Cd ) >> 4)];
dst[7*stride] = cm[dst[7*stride] + ((Gd - Cd ) >> 4)];
dst[0*stride] = av_clip_uint8(dst[0*stride] + ((Gd + Cd ) >> 4));
dst[7*stride] = av_clip_uint8(dst[7*stride] + ((Gd - Cd ) >> 4));
dst[1*stride] = cm[dst[1*stride] + ((Add + Hd ) >> 4)];
dst[2*stride] = cm[dst[2*stride] + ((Add - Hd ) >> 4)];
dst[1*stride] = av_clip_uint8(dst[1*stride] + ((Add + Hd ) >> 4));
dst[2*stride] = av_clip_uint8(dst[2*stride] + ((Add - Hd ) >> 4));
dst[3*stride] = cm[dst[3*stride] + ((Ed + Dd ) >> 4)];
dst[4*stride] = cm[dst[4*stride] + ((Ed - Dd ) >> 4)];
dst[3*stride] = av_clip_uint8(dst[3*stride] + ((Ed + Dd ) >> 4));
dst[4*stride] = av_clip_uint8(dst[4*stride] + ((Ed - Dd ) >> 4));
dst[5*stride] = cm[dst[5*stride] + ((Fd + Bdd ) >> 4)];
dst[6*stride] = cm[dst[6*stride] + ((Fd - Bdd ) >> 4)];
dst[5*stride] = av_clip_uint8(dst[5*stride] + ((Fd + Bdd ) >> 4));
dst[6*stride] = av_clip_uint8(dst[6*stride] + ((Fd - Bdd ) >> 4));
}
} else {
@ -190,18 +189,18 @@ static av_always_inline void idct(uint8_t *dst, int stride, int16_t *input, int
dst[4*stride]=
dst[5*stride]=
dst[6*stride]=
dst[7*stride]= cm[128 + ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20)];
dst[7*stride]= av_clip_uint8(128 + ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20));
}else{
if(ip[0*8]){
int v= ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20);
dst[0*stride] = cm[dst[0*stride] + v];
dst[1*stride] = cm[dst[1*stride] + v];
dst[2*stride] = cm[dst[2*stride] + v];
dst[3*stride] = cm[dst[3*stride] + v];
dst[4*stride] = cm[dst[4*stride] + v];
dst[5*stride] = cm[dst[5*stride] + v];
dst[6*stride] = cm[dst[6*stride] + v];
dst[7*stride] = cm[dst[7*stride] + v];
dst[0*stride] = av_clip_uint8(dst[0*stride] + v);
dst[1*stride] = av_clip_uint8(dst[1*stride] + v);
dst[2*stride] = av_clip_uint8(dst[2*stride] + v);
dst[3*stride] = av_clip_uint8(dst[3*stride] + v);
dst[4*stride] = av_clip_uint8(dst[4*stride] + v);
dst[5*stride] = av_clip_uint8(dst[5*stride] + v);
dst[6*stride] = av_clip_uint8(dst[6*stride] + v);
dst[7*stride] = av_clip_uint8(dst[7*stride] + v);
}
}
}
@ -225,17 +224,16 @@ void ff_vp3_idct_add_c(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*
void ff_vp3_idct_dc_add_c(uint8_t *dest/*align 8*/, int line_size, const DCTELEM *block/*align 16*/){
int i, dc = (block[0] + 15) >> 5;
const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP + dc;
for(i = 0; i < 8; i++){
dest[0] = cm[dest[0]];
dest[1] = cm[dest[1]];
dest[2] = cm[dest[2]];
dest[3] = cm[dest[3]];
dest[4] = cm[dest[4]];
dest[5] = cm[dest[5]];
dest[6] = cm[dest[6]];
dest[7] = cm[dest[7]];
dest[0] = av_clip_uint8(dest[0] + dc);
dest[1] = av_clip_uint8(dest[1] + dc);
dest[2] = av_clip_uint8(dest[2] + dc);
dest[3] = av_clip_uint8(dest[3] + dc);
dest[4] = av_clip_uint8(dest[4] + dc);
dest[5] = av_clip_uint8(dest[5] + dc);
dest[6] = av_clip_uint8(dest[6] + dc);
dest[7] = av_clip_uint8(dest[7] + dc);
dest += line_size;
}
}

18
libavcodec/vp8dsp.c
Unescape View File

@ -80,7 +80,6 @@ static void vp8_luma_dc_wht_dc_c(DCTELEM block[4][4][16], DCTELEM dc[16])
static void vp8_idct_add_c(uint8_t *dst, DCTELEM block[16], ptrdiff_t stride)
{
int i, t0, t1, t2, t3;
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
DCTELEM tmp[16];
for (i = 0; i < 4; i++) {
@ -105,10 +104,10 @@ static void vp8_idct_add_c(uint8_t *dst, DCTELEM block[16], ptrdiff_t stride)
t2 = MUL_35468(tmp[1*4+i]) - MUL_20091(tmp[3*4+i]);
t3 = MUL_20091(tmp[1*4+i]) + MUL_35468(tmp[3*4+i]);
dst[0] = cm[dst[0] + ((t0 + t3 + 4) >> 3)];
dst[1] = cm[dst[1] + ((t1 + t2 + 4) >> 3)];
dst[2] = cm[dst[2] + ((t1 - t2 + 4) >> 3)];
dst[3] = cm[dst[3] + ((t0 - t3 + 4) >> 3)];
dst[0] = av_clip_uint8(dst[0] + ((t0 + t3 + 4) >> 3));
dst[1] = av_clip_uint8(dst[1] + ((t1 + t2 + 4) >> 3));
dst[2] = av_clip_uint8(dst[2] + ((t1 - t2 + 4) >> 3));
dst[3] = av_clip_uint8(dst[3] + ((t0 - t3 + 4) >> 3));
dst += stride;
}
}
@ -116,14 +115,13 @@ static void vp8_idct_add_c(uint8_t *dst, DCTELEM block[16], ptrdiff_t stride)
static void vp8_idct_dc_add_c(uint8_t *dst, DCTELEM block[16], ptrdiff_t stride)
{
int i, dc = (block[0] + 4) >> 3;
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP + dc;
block[0] = 0;
for (i = 0; i < 4; i++) {
dst[0] = cm[dst[0]];
dst[1] = cm[dst[1]];
dst[2] = cm[dst[2]];
dst[3] = cm[dst[3]];
dst[0] = av_clip_uint8(dst[0] + dc);
dst[1] = av_clip_uint8(dst[1] + dc);
dst[2] = av_clip_uint8(dst[2] + dc);
dst[3] = av_clip_uint8(dst[3] + dc);
dst += stride;
}
}

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