h264dec: fix Lossless Decoding (Profile 244) for 8x8 Intra Prediction

CC: libav-stable@libav.org
Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/h264_mb.c

@@ -636,7 +636,12 @@ static av_always_inline void hl_decode_mb_predict_luma(const H264Context *h,
                 uint8_t *const ptr = dest_y + block_offset[i];
                 const int dir      = sl->intra4x4_pred_mode_cache[scan8[i]];
                 if (transform_bypass && h->ps.sps->profile_idc == 244 && dir <= 1) {
-                    h->hpc.pred8x8l_add[dir](ptr, sl->mb + (i * 16 + p * 256 << pixel_shift), linesize);
+                    if (h->x264_build < 151U) {
+                        h->hpc.pred8x8l_add[dir](ptr, sl->mb + (i * 16 + p * 256 << pixel_shift), linesize);
+                    } else
+                        h->hpc.pred8x8l_filter_add[dir](ptr, sl->mb + (i * 16 + p * 256 << pixel_shift),
+                                                        (sl-> topleft_samples_available << i) & 0x8000,
+                                                        (sl->topright_samples_available << i) & 0x4000, linesize);
                 } else {
                     const int nnz = sl->non_zero_count_cache[scan8[i + p * 16]];
                     h->hpc.pred8x8l[dir](ptr, (sl->topleft_samples_available << i) & 0x8000,

libavcodec/h264pred.c

@@ -552,6 +552,8 @@ av_cold void ff_h264_pred_init(H264PredContext *h, int codec_id,
     h->pred4x4_add  [ HOR_PRED   ]= FUNCC(pred4x4_horizontal_add          , depth);\
     h->pred8x8l_add [VERT_PRED   ]= FUNCC(pred8x8l_vertical_add           , depth);\
     h->pred8x8l_add [ HOR_PRED   ]= FUNCC(pred8x8l_horizontal_add         , depth);\
+    h->pred8x8l_filter_add [VERT_PRED   ]= FUNCC(pred8x8l_vertical_filter_add           , depth);\
+    h->pred8x8l_filter_add [ HOR_PRED   ]= FUNCC(pred8x8l_horizontal_filter_add         , depth);\
     if (chroma_format_idc <= 1) {\
     h->pred8x8_add  [VERT_PRED8x8]= FUNCC(pred8x8_vertical_add            , depth);\
     h->pred8x8_add  [ HOR_PRED8x8]= FUNCC(pred8x8_horizontal_add          , depth);\

libavcodec/h264pred.h

@@ -101,6 +101,9 @@ typedef struct H264PredContext {
                           int16_t *block /*align 16*/, ptrdiff_t stride);
     void(*pred8x8l_add[2])(uint8_t *pix /*align  8*/,
                            int16_t *block /*align 16*/, ptrdiff_t stride);
+    void(*pred8x8l_filter_add[2])(uint8_t *pix /*align  8*/,
+                                  int16_t *block /*align 16*/,
+                                  int topleft, int topright, ptrdiff_t stride);
     void(*pred8x8_add[3])(uint8_t *pix /*align  8*/,
                           const int *block_offset,
                           int16_t *block /*align 16*/, ptrdiff_t stride);

libavcodec/h264pred_template.c

@@ -1123,6 +1123,79 @@ static void FUNCC(pred8x8l_horizontal_up)(uint8_t *_src, int has_topleft,
     SRC(5,6)=SRC(5,7)=SRC(6,4)=SRC(6,5)=SRC(6,6)=
     SRC(6,7)=SRC(7,4)=SRC(7,5)=SRC(7,6)=SRC(7,7)= l7;
 }
+
+static void FUNCC(pred8x8l_vertical_filter_add)(uint8_t *_src, int16_t *_block, int has_topleft,
+                                                int has_topright, ptrdiff_t _stride)
+{
+    int i;
+    pixel *src = (pixel*)_src;
+    const dctcoef *block = (const dctcoef*)_block;
+    pixel pix[8];
+    int stride = _stride/sizeof(pixel);
+    PREDICT_8x8_LOAD_TOP;
+
+    pix[0] = t0;
+    pix[1] = t1;
+    pix[2] = t2;
+    pix[3] = t3;
+    pix[4] = t4;
+    pix[5] = t5;
+    pix[6] = t6;
+    pix[7] = t7;
+
+    for (i = 0; i < 8; i++) {
+        pixel v = pix[i];
+        src[0 * stride] = v += block[0];
+        src[1 * stride] = v += block[8];
+        src[2 * stride] = v += block[16];
+        src[3 * stride] = v += block[24];
+        src[4 * stride] = v += block[32];
+        src[5 * stride] = v += block[40];
+        src[6 * stride] = v += block[48];
+        src[7 * stride] = v +  block[56];
+        src++;
+        block++;
+    }
+
+    memset(_block, 0, sizeof(dctcoef) * 64);
+}
+
+static void FUNCC(pred8x8l_horizontal_filter_add)(uint8_t *_src, int16_t *_block, int has_topleft,
+                                                  int has_topright, ptrdiff_t _stride)
+{
+    int i;
+    pixel *src = (pixel*)_src;
+    const dctcoef *block = (const dctcoef*)_block;
+    pixel pix[8];
+    int stride = _stride/sizeof(pixel);
+    PREDICT_8x8_LOAD_LEFT;
+
+    pix[0] = l0;
+    pix[1] = l1;
+    pix[2] = l2;
+    pix[3] = l3;
+    pix[4] = l4;
+    pix[5] = l5;
+    pix[6] = l6;
+    pix[7] = l7;
+
+    for (i = 0; i < 8; i++) {
+        pixel v = pix[i];
+        src[0] = v += block[0];
+        src[1] = v += block[1];
+        src[2] = v += block[2];
+        src[3] = v += block[3];
+        src[4] = v += block[4];
+        src[5] = v += block[5];
+        src[6] = v += block[6];
+        src[7] = v +  block[7];
+        src   += stride;
+        block += 8;
+    }
+
+    memset(_block, 0, sizeof(dctcoef) * 64);
+}
+
 #undef PREDICT_8x8_LOAD_LEFT
 #undef PREDICT_8x8_LOAD_TOP
 #undef PREDICT_8x8_LOAD_TOPLEFT