Move +52 from the loop filter to the alpha/beta offsets in the context.

This should fix a segfault, also it might be faster on systems where the
+52 wasnt free.

Originally committed as revision 21406 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/dxva2_h264.c

@@ -225,8 +225,8 @@ static void fill_slice_long(AVCodecContext *avctx, DXVA_Slice_H264_Long *slice,
         slice->num_ref_idx_l0_active_minus1 = h->ref_count[0] - 1;
     if (h->list_count > 1)
         slice->num_ref_idx_l1_active_minus1 = h->ref_count[1] - 1;
-    slice->slice_alpha_c0_offset_div2   = h->slice_alpha_c0_offset / 2;
-    slice->slice_beta_offset_div2       = h->slice_beta_offset / 2;
+    slice->slice_alpha_c0_offset_div2   = h->slice_alpha_c0_offset / 2 - 26;
+    slice->slice_beta_offset_div2       = h->slice_beta_offset     / 2 - 26;
     slice->Reserved8Bits                = 0;
 
     for (list = 0; list < 2; list++) {

libavcodec/h264.c

@@ -2032,8 +2032,8 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
     }
 
     h->deblocking_filter = 1;
-    h->slice_alpha_c0_offset = 0;
-    h->slice_beta_offset = 0;
+    h->slice_alpha_c0_offset = 52;
+    h->slice_beta_offset = 52;
     if( h->pps.deblocking_filter_parameters_present ) {
         tmp= get_ue_golomb_31(&s->gb);
         if(tmp > 2){
@@ -2045,8 +2045,13 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
             h->deblocking_filter^= 1; // 1<->0
 
         if( h->deblocking_filter ) {
-            h->slice_alpha_c0_offset = get_se_golomb(&s->gb) << 1;
-            h->slice_beta_offset = get_se_golomb(&s->gb) << 1;
+            h->slice_alpha_c0_offset += get_se_golomb(&s->gb) << 1;
+            h->slice_beta_offset     += get_se_golomb(&s->gb) << 1;
+            if(   h->slice_alpha_c0_offset > 104U
+               || h->slice_beta_offset     > 104U){
+                av_log(s->avctx, AV_LOG_ERROR, "deblocking filter parameters %d %d out of range\n", h->slice_alpha_c0_offset, h->slice_beta_offset);
+                return -1;
+            }
         }
     }
 
@@ -2071,7 +2076,7 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
                 return 1; // deblocking switched inside frame
         }
     }
-    h->qp_thresh= 15 - FFMIN(h->slice_alpha_c0_offset, h->slice_beta_offset) - FFMAX3(0, h->pps.chroma_qp_index_offset[0], h->pps.chroma_qp_index_offset[1]);
+    h->qp_thresh= 15 + 52 - FFMIN(h->slice_alpha_c0_offset, h->slice_beta_offset) - FFMAX3(0, h->pps.chroma_qp_index_offset[0], h->pps.chroma_qp_index_offset[1]);
 
 #if 0 //FMO
     if( h->pps.num_slice_groups > 1  && h->pps.mb_slice_group_map_type >= 3 && h->pps.mb_slice_group_map_type <= 5)
@@ -2132,7 +2137,7 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
                s->current_picture_ptr->field_poc[0], s->current_picture_ptr->field_poc[1],
                h->ref_count[0], h->ref_count[1],
                s->qscale,
-               h->deblocking_filter, h->slice_alpha_c0_offset/2, h->slice_beta_offset/2,
+               h->deblocking_filter, h->slice_alpha_c0_offset/2-26, h->slice_beta_offset/2-26,
                h->use_weight,
                h->use_weight==1 && h->use_weight_chroma ? "c" : "",
                h->slice_type == FF_B_TYPE ? (h->direct_spatial_mv_pred ? "SPAT" : "TEMP") : ""

libavcodec/h264_loopfilter.c

@@ -100,9 +100,9 @@ static const uint8_t tc0_table[52*3][4] = {
 };
 
 static void av_noinline filter_mb_edgev( uint8_t *pix, int stride, int16_t bS[4], unsigned int qp, H264Context *h) {
-    const unsigned int index_a = 52 + qp + h->slice_alpha_c0_offset;
+    const unsigned int index_a = qp + h->slice_alpha_c0_offset;
     const int alpha = alpha_table[index_a];
-    const int beta  = (beta_table+52)[qp + h->slice_beta_offset];
+    const int beta  = beta_table[qp + h->slice_beta_offset];
     if (alpha ==0 || beta == 0) return;
 
     if( bS[0] < 4 ) {
@@ -117,9 +117,9 @@ static void av_noinline filter_mb_edgev( uint8_t *pix, int stride, int16_t bS[4]
     }
 }
 static void av_noinline filter_mb_edgecv( uint8_t *pix, int stride, int16_t bS[4], unsigned int qp, H264Context *h ) {
-    const unsigned int index_a = 52 + qp + h->slice_alpha_c0_offset;
+    const unsigned int index_a = qp + h->slice_alpha_c0_offset;
     const int alpha = alpha_table[index_a];
-    const int beta  = (beta_table+52)[qp + h->slice_beta_offset];
+    const int beta  = beta_table[qp + h->slice_beta_offset];
     if (alpha ==0 || beta == 0) return;
 
     if( bS[0] < 4 ) {
@@ -137,8 +137,8 @@ static void av_noinline filter_mb_edgecv( uint8_t *pix, int stride, int16_t bS[4
 static void filter_mb_mbaff_edgev( H264Context *h, uint8_t *pix, int stride, int16_t bS[4], int bsi, int qp ) {
     int i;
     int index_a = qp + h->slice_alpha_c0_offset;
-    int alpha = (alpha_table+52)[index_a];
-    int beta  = (beta_table+52)[qp + h->slice_beta_offset];
+    int alpha = alpha_table[index_a];
+    int beta  = beta_table[qp + h->slice_beta_offset];
     for( i = 0; i < 8; i++, pix += stride) {
         const int bS_index = (i >> 1) * bsi;
 
@@ -147,7 +147,7 @@ static void filter_mb_mbaff_edgev( H264Context *h, uint8_t *pix, int stride, int
         }
 
         if( bS[bS_index] < 4 ) {
-            const int tc0 = (tc0_table+52)[index_a][bS[bS_index]];
+            const int tc0 = tc0_table[index_a][bS[bS_index]];
             const int p0 = pix[-1];
             const int p1 = pix[-2];
             const int p2 = pix[-3];
@@ -226,8 +226,8 @@ static void filter_mb_mbaff_edgev( H264Context *h, uint8_t *pix, int stride, int
 static void filter_mb_mbaff_edgecv( H264Context *h, uint8_t *pix, int stride, int16_t bS[4], int bsi, int qp ) {
     int i;
     int index_a = qp + h->slice_alpha_c0_offset;
-    int alpha = (alpha_table+52)[index_a];
-    int beta  = (beta_table+52)[qp + h->slice_beta_offset];
+    int alpha = alpha_table[index_a];
+    int beta  = beta_table[qp + h->slice_beta_offset];
     for( i = 0; i < 4; i++, pix += stride) {
         const int bS_index = i*bsi;
 
@@ -236,7 +236,7 @@ static void filter_mb_mbaff_edgecv( H264Context *h, uint8_t *pix, int stride, in
         }
 
         if( bS[bS_index] < 4 ) {
-            const int tc = (tc0_table+52)[index_a][bS[bS_index]] + 1;
+            const int tc = tc0_table[index_a][bS[bS_index]] + 1;
             const int p0 = pix[-1];
             const int p1 = pix[-2];
             const int q0 = pix[0];
@@ -270,9 +270,9 @@ static void filter_mb_mbaff_edgecv( H264Context *h, uint8_t *pix, int stride, in
 }
 
 static void av_noinline filter_mb_edgeh( uint8_t *pix, int stride, int16_t bS[4], unsigned int qp, H264Context *h ) {
-    const unsigned int index_a = 52 + qp + h->slice_alpha_c0_offset;
+    const unsigned int index_a = qp + h->slice_alpha_c0_offset;
     const int alpha = alpha_table[index_a];
-    const int beta  = (beta_table+52)[qp + h->slice_beta_offset];
+    const int beta  = beta_table[qp + h->slice_beta_offset];
     if (alpha ==0 || beta == 0) return;
 
     if( bS[0] < 4 ) {
@@ -288,9 +288,9 @@ static void av_noinline filter_mb_edgeh( uint8_t *pix, int stride, int16_t bS[4]
 }
 
 static void av_noinline filter_mb_edgech( uint8_t *pix, int stride, int16_t bS[4], unsigned int qp, H264Context *h ) {
-    const unsigned int index_a = 52 + qp + h->slice_alpha_c0_offset;
+    const unsigned int index_a = qp + h->slice_alpha_c0_offset;
     const int alpha = alpha_table[index_a];
-    const int beta  = (beta_table+52)[qp + h->slice_beta_offset];
+    const int beta  = beta_table[qp + h->slice_beta_offset];
     if (alpha ==0 || beta == 0) return;
 
     if( bS[0] < 4 ) {
@@ -332,7 +332,7 @@ void ff_h264_filter_mb_fast( H264Context *h, int mb_x, int mb_y, uint8_t *img_y,
     qp1 = (qp + qp1 + 1) >> 1;
     qpc0 = (qpc + qpc0 + 1) >> 1;
     qpc1 = (qpc + qpc1 + 1) >> 1;
-    qp_thresh = 15 - h->slice_alpha_c0_offset;
+    qp_thresh = 15+52 - h->slice_alpha_c0_offset;
     if(qp <= qp_thresh && qp0 <= qp_thresh && qp1 <= qp_thresh &&
        qpc <= qp_thresh && qpc0 <= qp_thresh && qpc1 <= qp_thresh)
         return;

libavcodec/vaapi_h264.c

@@ -317,8 +317,8 @@ static int decode_slice(AVCodecContext *avctx,
     slice_param->cabac_init_idc                 = h->cabac_init_idc;
     slice_param->slice_qp_delta                 = s->qscale - h->pps.init_qp;
     slice_param->disable_deblocking_filter_idc  = h->deblocking_filter < 2 ? !h->deblocking_filter : h->deblocking_filter;
-    slice_param->slice_alpha_c0_offset_div2     = h->slice_alpha_c0_offset / 2;
-    slice_param->slice_beta_offset_div2         = h->slice_beta_offset / 2;
+    slice_param->slice_alpha_c0_offset_div2     = h->slice_alpha_c0_offset / 2 - 26;
+    slice_param->slice_beta_offset_div2         = h->slice_beta_offset     / 2 - 26;
     slice_param->luma_log2_weight_denom         = h->luma_log2_weight_denom;
     slice_param->chroma_log2_weight_denom       = h->chroma_log2_weight_denom;