libopenh264enc: Return a more sensible error code in some init failure paths
[ffmpeg.git] / libavcodec / h264_mvpred.h
index a7545f0..83b1ea6 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * H.26L/H.264/AVC/JVT/14496-10/... motion vector predicion
+ * H.26L/H.264/AVC/JVT/14496-10/... motion vector prediction
  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
  *
  * This file is part of Libav.
@@ -21,7 +21,7 @@
 
 /**
  * @file
- * H.264 / AVC / MPEG4 part10 motion vector predicion.
+ * H.264 / AVC / MPEG-4 part10 motion vector prediction.
  * @author Michael Niedermayer <michaelni@gmx.at>
  */
 
 
 #include "internal.h"
 #include "avcodec.h"
-#include "h264.h"
+#include "h264dec.h"
+#include "mpegutils.h"
 
 #include <assert.h>
 
-static av_always_inline int fetch_diagonal_mv(H264Context *h, const int16_t **C,
+static av_always_inline int fetch_diagonal_mv(const H264Context *h, H264SliceContext *sl,
+                                              const int16_t **C,
                                               int i, int list, int part_width)
 {
-    const int topright_ref = h->ref_cache[list][i - 8 + part_width];
+    const int topright_ref = sl->ref_cache[list][i - 8 + part_width];
 
     /* there is no consistent mapping of mvs to neighboring locations that will
      * make mbaff happy, so we can't move all this logic to fill_caches */
@@ -48,38 +50,38 @@ static av_always_inline int fetch_diagonal_mv(H264Context *h, const int16_t **C,
         if (!USES_LIST(mb_type, list))                                  \
             return LIST_NOT_USED;                                       \
         mv = h->cur_pic_ptr->motion_val[list][h->mb2b_xy[xy] + 3 + y4 * h->b_stride]; \
-        h->mv_cache[list][scan8[0] - 2][0] = mv[0];                     \
-        h->mv_cache[list][scan8[0] - 2][1] = mv[1] MV_OP;               \
+        sl->mv_cache[list][scan8[0] - 2][0] = mv[0];                     \
+        sl->mv_cache[list][scan8[0] - 2][1] = mv[1] MV_OP;               \
         return h->cur_pic_ptr->ref_index[list][4 * xy + 1 + (y4 & ~1)] REF_OP;
 
         if (topright_ref == PART_NOT_AVAILABLE
             && i >= scan8[0] + 8 && (i & 7) == 4
-            && h->ref_cache[list][scan8[0] - 1] != PART_NOT_AVAILABLE) {
+            && sl->ref_cache[list][scan8[0] - 1] != PART_NOT_AVAILABLE) {
             const uint32_t *mb_types = h->cur_pic_ptr->mb_type;
             const int16_t *mv;
-            AV_ZERO32(h->mv_cache[list][scan8[0] - 2]);
-            *C = h->mv_cache[list][scan8[0] - 2];
+            AV_ZERO32(sl->mv_cache[list][scan8[0] - 2]);
+            *C = sl->mv_cache[list][scan8[0] - 2];
 
-            if (!MB_FIELD(h) && IS_INTERLACED(h->left_type[0])) {
-                SET_DIAG_MV(* 2, >> 1, h->left_mb_xy[0] + h->mb_stride,
-                            (h->mb_y & 1) * 2 + (i >> 5));
+            if (!MB_FIELD(sl) && IS_INTERLACED(sl->left_type[0])) {
+                SET_DIAG_MV(* 2, >> 1, sl->left_mb_xy[0] + h->mb_stride,
+                            (sl->mb_y & 1) * 2 + (i >> 5));
             }
-            if (MB_FIELD(h) && !IS_INTERLACED(h->left_type[0])) {
+            if (MB_FIELD(sl) && !IS_INTERLACED(sl->left_type[0])) {
                 // left shift will turn LIST_NOT_USED into PART_NOT_AVAILABLE, but that's OK.
-                SET_DIAG_MV(/ 2, << 1, h->left_mb_xy[i >= 36], ((i >> 2)) & 3);
+                SET_DIAG_MV(/ 2, << 1, sl->left_mb_xy[i >= 36], ((i >> 2)) & 3);
             }
         }
 #undef SET_DIAG_MV
     }
 
     if (topright_ref != PART_NOT_AVAILABLE) {
-        *C = h->mv_cache[list][i - 8 + part_width];
+        *C = sl->mv_cache[list][i - 8 + part_width];
         return topright_ref;
     } else {
-        tprintf(h->avctx, "topright MV not available\n");
+        ff_tlog(h->avctx, "topright MV not available\n");
 
-        *C = h->mv_cache[list][i - 8 - 1];
-        return h->ref_cache[list][i - 8 - 1];
+        *C = sl->mv_cache[list][i - 8 - 1];
+        return sl->ref_cache[list][i - 8 - 1];
     }
 }
 
@@ -90,15 +92,17 @@ static av_always_inline int fetch_diagonal_mv(H264Context *h, const int16_t **C,
  * @param mx the x component of the predicted motion vector
  * @param my the y component of the predicted motion vector
  */
-static av_always_inline void pred_motion(H264Context *const h, int n,
+static av_always_inline void pred_motion(const H264Context *const h,
+                                         H264SliceContext *sl,
+                                         int n,
                                          int part_width, int list, int ref,
                                          int *const mx, int *const my)
 {
     const int index8       = scan8[n];
-    const int top_ref      = h->ref_cache[list][index8 - 8];
-    const int left_ref     = h->ref_cache[list][index8 - 1];
-    const int16_t *const A = h->mv_cache[list][index8 - 1];
-    const int16_t *const B = h->mv_cache[list][index8 - 8];
+    const int top_ref      = sl->ref_cache[list][index8 - 8];
+    const int left_ref     = sl->ref_cache[list][index8 - 1];
+    const int16_t *const A = sl->mv_cache[list][index8 - 1];
+    const int16_t *const B = sl->mv_cache[list][index8 - 8];
     const int16_t *C;
     int diagonal_ref, match_count;
 
@@ -112,9 +116,9 @@ static av_always_inline void pred_motion(H264Context *const h, int n,
  * . . . L . . . .
  */
 
-    diagonal_ref = fetch_diagonal_mv(h, &C, index8, list, part_width);
+    diagonal_ref = fetch_diagonal_mv(h, sl, &C, index8, list, part_width);
     match_count  = (diagonal_ref == ref) + (top_ref == ref) + (left_ref == ref);
-    tprintf(h->avctx, "pred_motion match_count=%d\n", match_count);
+    ff_tlog(h->avctx, "pred_motion match_count=%d\n", match_count);
     if (match_count > 1) { //most common
         *mx = mid_pred(A[0], B[0], C[0]);
         *my = mid_pred(A[1], B[1], C[1]);
@@ -141,10 +145,10 @@ static av_always_inline void pred_motion(H264Context *const h, int n,
         }
     }
 
-    tprintf(h->avctx,
+    ff_tlog(h->avctx,
             "pred_motion (%2d %2d %2d) (%2d %2d %2d) (%2d %2d %2d) -> (%2d %2d %2d) at %2d %2d %d list %d\n",
             top_ref, B[0], B[1], diagonal_ref, C[0], C[1], left_ref,
-            A[0], A[1], ref, *mx, *my, h->mb_x, h->mb_y, n, list);
+            A[0], A[1], ref, *mx, *my, sl->mb_x, sl->mb_y, n, list);
 }
 
 /**
@@ -153,16 +157,17 @@ static av_always_inline void pred_motion(H264Context *const h, int n,
  * @param mx the x component of the predicted motion vector
  * @param my the y component of the predicted motion vector
  */
-static av_always_inline void pred_16x8_motion(H264Context *const h,
+static av_always_inline void pred_16x8_motion(const H264Context *const h,
+                                              H264SliceContext *sl,
                                               int n, int list, int ref,
                                               int *const mx, int *const my)
 {
     if (n == 0) {
-        const int top_ref      = h->ref_cache[list][scan8[0] - 8];
-        const int16_t *const B = h->mv_cache[list][scan8[0] - 8];
+        const int top_ref      = sl->ref_cache[list][scan8[0] - 8];
+        const int16_t *const B = sl->mv_cache[list][scan8[0] - 8];
 
-        tprintf(h->avctx, "pred_16x8: (%2d %2d %2d) at %2d %2d %d list %d\n",
-                top_ref, B[0], B[1], h->mb_x, h->mb_y, n, list);
+        ff_tlog(h->avctx, "pred_16x8: (%2d %2d %2d) at %2d %2d %d list %d\n",
+                top_ref, B[0], B[1], sl->mb_x, sl->mb_y, n, list);
 
         if (top_ref == ref) {
             *mx = B[0];
@@ -170,11 +175,11 @@ static av_always_inline void pred_16x8_motion(H264Context *const h,
             return;
         }
     } else {
-        const int left_ref     = h->ref_cache[list][scan8[8] - 1];
-        const int16_t *const A = h->mv_cache[list][scan8[8] - 1];
+        const int left_ref     = sl->ref_cache[list][scan8[8] - 1];
+        const int16_t *const A = sl->mv_cache[list][scan8[8] - 1];
 
-        tprintf(h->avctx, "pred_16x8: (%2d %2d %2d) at %2d %2d %d list %d\n",
-                left_ref, A[0], A[1], h->mb_x, h->mb_y, n, list);
+        ff_tlog(h->avctx, "pred_16x8: (%2d %2d %2d) at %2d %2d %d list %d\n",
+                left_ref, A[0], A[1], sl->mb_x, sl->mb_y, n, list);
 
         if (left_ref == ref) {
             *mx = A[0];
@@ -184,7 +189,7 @@ static av_always_inline void pred_16x8_motion(H264Context *const h,
     }
 
     //RARE
-    pred_motion(h, n, 4, list, ref, mx, my);
+    pred_motion(h, sl, n, 4, list, ref, mx, my);
 }
 
 /**
@@ -193,16 +198,17 @@ static av_always_inline void pred_16x8_motion(H264Context *const h,
  * @param mx the x component of the predicted motion vector
  * @param my the y component of the predicted motion vector
  */
-static av_always_inline void pred_8x16_motion(H264Context *const h,
+static av_always_inline void pred_8x16_motion(const H264Context *const h,
+                                              H264SliceContext *sl,
                                               int n, int list, int ref,
                                               int *const mx, int *const my)
 {
     if (n == 0) {
-        const int left_ref     = h->ref_cache[list][scan8[0] - 1];
-        const int16_t *const A = h->mv_cache[list][scan8[0] - 1];
+        const int left_ref     = sl->ref_cache[list][scan8[0] - 1];
+        const int16_t *const A = sl->mv_cache[list][scan8[0] - 1];
 
-        tprintf(h->avctx, "pred_8x16: (%2d %2d %2d) at %2d %2d %d list %d\n",
-                left_ref, A[0], A[1], h->mb_x, h->mb_y, n, list);
+        ff_tlog(h->avctx, "pred_8x16: (%2d %2d %2d) at %2d %2d %d list %d\n",
+                left_ref, A[0], A[1], sl->mb_x, sl->mb_y, n, list);
 
         if (left_ref == ref) {
             *mx = A[0];
@@ -213,10 +219,10 @@ static av_always_inline void pred_8x16_motion(H264Context *const h,
         const int16_t *C;
         int diagonal_ref;
 
-        diagonal_ref = fetch_diagonal_mv(h, &C, scan8[4], list, 2);
+        diagonal_ref = fetch_diagonal_mv(h, sl, &C, scan8[4], list, 2);
 
-        tprintf(h->avctx, "pred_8x16: (%2d %2d %2d) at %2d %2d %d list %d\n",
-                diagonal_ref, C[0], C[1], h->mb_x, h->mb_y, n, list);
+        ff_tlog(h->avctx, "pred_8x16: (%2d %2d %2d) at %2d %2d %d list %d\n",
+                diagonal_ref, C[0], C[1], sl->mb_x, sl->mb_y, n, list);
 
         if (diagonal_ref == ref) {
             *mx = C[0];
@@ -226,12 +232,12 @@ static av_always_inline void pred_8x16_motion(H264Context *const h,
     }
 
     //RARE
-    pred_motion(h, n, 2, list, ref, mx, my);
+    pred_motion(h, sl, n, 2, list, ref, mx, my);
 }
 
 #define FIX_MV_MBAFF(type, refn, mvn, idx)      \
     if (FRAME_MBAFF(h)) {                       \
-        if (MB_FIELD(h)) {                      \
+        if (MB_FIELD(sl)) {                     \
             if (!IS_INTERLACED(type)) {         \
                 refn <<= 1;                     \
                 AV_COPY32(mvbuf[idx], mvn);     \
@@ -248,7 +254,8 @@ static av_always_inline void pred_8x16_motion(H264Context *const h,
         }                                       \
     }
 
-static av_always_inline void pred_pskip_motion(H264Context *const h)
+static av_always_inline void pred_pskip_motion(const H264Context *const h,
+                                               H264SliceContext *sl)
 {
     DECLARE_ALIGNED(4, static const int16_t, zeromv)[2] = { 0 };
     DECLARE_ALIGNED(4, int16_t, mvbuf)[3][2];
@@ -258,57 +265,57 @@ static av_always_inline void pred_pskip_motion(H264Context *const h)
     const int16_t *A, *B, *C;
     int b_stride = h->b_stride;
 
-    fill_rectangle(&h->ref_cache[0][scan8[0]], 4, 4, 8, 0, 1);
+    fill_rectangle(&sl->ref_cache[0][scan8[0]], 4, 4, 8, 0, 1);
 
     /* To avoid doing an entire fill_decode_caches, we inline the relevant
      * parts here.
      * FIXME: this is a partial duplicate of the logic in fill_decode_caches,
      * but it's faster this way.  Is there a way to avoid this duplication?
      */
-    if (USES_LIST(h->left_type[LTOP], 0)) {
-        left_ref = ref[4 * h->left_mb_xy[LTOP] + 1 + (h->left_block[0] & ~1)];
-        A = mv[h->mb2b_xy[h->left_mb_xy[LTOP]] + 3 + b_stride * h->left_block[0]];
-        FIX_MV_MBAFF(h->left_type[LTOP], left_ref, A, 0);
+    if (USES_LIST(sl->left_type[LTOP], 0)) {
+        left_ref = ref[4 * sl->left_mb_xy[LTOP] + 1 + (sl->left_block[0] & ~1)];
+        A = mv[h->mb2b_xy[sl->left_mb_xy[LTOP]] + 3 + b_stride * sl->left_block[0]];
+        FIX_MV_MBAFF(sl->left_type[LTOP], left_ref, A, 0);
         if (!(left_ref | AV_RN32A(A)))
             goto zeromv;
-    } else if (h->left_type[LTOP]) {
+    } else if (sl->left_type[LTOP]) {
         left_ref = LIST_NOT_USED;
         A        = zeromv;
     } else {
         goto zeromv;
     }
 
-    if (USES_LIST(h->top_type, 0)) {
-        top_ref = ref[4 * h->top_mb_xy + 2];
-        B       = mv[h->mb2b_xy[h->top_mb_xy] + 3 * b_stride];
-        FIX_MV_MBAFF(h->top_type, top_ref, B, 1);
+    if (USES_LIST(sl->top_type, 0)) {
+        top_ref = ref[4 * sl->top_mb_xy + 2];
+        B       = mv[h->mb2b_xy[sl->top_mb_xy] + 3 * b_stride];
+        FIX_MV_MBAFF(sl->top_type, top_ref, B, 1);
         if (!(top_ref | AV_RN32A(B)))
             goto zeromv;
-    } else if (h->top_type) {
+    } else if (sl->top_type) {
         top_ref = LIST_NOT_USED;
         B       = zeromv;
     } else {
         goto zeromv;
     }
 
-    tprintf(h->avctx, "pred_pskip: (%d) (%d) at %2d %2d\n",
-            top_ref, left_ref, h->mb_x, h->mb_y);
+    ff_tlog(h->avctx, "pred_pskip: (%d) (%d) at %2d %2d\n",
+            top_ref, left_ref, sl->mb_x, sl->mb_y);
 
-    if (USES_LIST(h->topright_type, 0)) {
-        diagonal_ref = ref[4 * h->topright_mb_xy + 2];
-        C = mv[h->mb2b_xy[h->topright_mb_xy] + 3 * b_stride];
-        FIX_MV_MBAFF(h->topright_type, diagonal_ref, C, 2);
-    } else if (h->topright_type) {
+    if (USES_LIST(sl->topright_type, 0)) {
+        diagonal_ref = ref[4 * sl->topright_mb_xy + 2];
+        C = mv[h->mb2b_xy[sl->topright_mb_xy] + 3 * b_stride];
+        FIX_MV_MBAFF(sl->topright_type, diagonal_ref, C, 2);
+    } else if (sl->topright_type) {
         diagonal_ref = LIST_NOT_USED;
         C = zeromv;
     } else {
-        if (USES_LIST(h->topleft_type, 0)) {
-            diagonal_ref = ref[4 * h->topleft_mb_xy + 1 +
-                               (h->topleft_partition & 2)];
-            C = mv[h->mb2b_xy[h->topleft_mb_xy] + 3 + b_stride +
-                   (h->topleft_partition & 2 * b_stride)];
-            FIX_MV_MBAFF(h->topleft_type, diagonal_ref, C, 2);
-        } else if (h->topleft_type) {
+        if (USES_LIST(sl->topleft_type, 0)) {
+            diagonal_ref = ref[4 * sl->topleft_mb_xy + 1 +
+                               (sl->topleft_partition & 2)];
+            C = mv[h->mb2b_xy[sl->topleft_mb_xy] + 3 + b_stride +
+                   (sl->topleft_partition & 2 * b_stride)];
+            FIX_MV_MBAFF(sl->topleft_type, diagonal_ref, C, 2);
+        } else if (sl->topleft_type) {
             diagonal_ref = LIST_NOT_USED;
             C            = zeromv;
         } else {
@@ -318,7 +325,7 @@ static av_always_inline void pred_pskip_motion(H264Context *const h)
     }
 
     match_count = !diagonal_ref + !top_ref + !left_ref;
-    tprintf(h->avctx, "pred_pskip_motion match_count=%d\n", match_count);
+    ff_tlog(h->avctx, "pred_pskip_motion match_count=%d\n", match_count);
     if (match_count > 1) {
         mx = mid_pred(A[0], B[0], C[0]);
         my = mid_pred(A[1], B[1], C[1]);
@@ -338,17 +345,17 @@ static av_always_inline void pred_pskip_motion(H264Context *const h)
         my = mid_pred(A[1], B[1], C[1]);
     }
 
-    fill_rectangle(h->mv_cache[0][scan8[0]], 4, 4, 8, pack16to32(mx, my), 4);
+    fill_rectangle(sl->mv_cache[0][scan8[0]], 4, 4, 8, pack16to32(mx, my), 4);
     return;
 
 zeromv:
-    fill_rectangle(h->mv_cache[0][scan8[0]], 4, 4, 8, 0, 4);
+    fill_rectangle(sl->mv_cache[0][scan8[0]], 4, 4, 8, 0, 4);
     return;
 }
 
-static void fill_decode_neighbors(H264Context *h, int mb_type)
+static void fill_decode_neighbors(const H264Context *h, H264SliceContext *sl, int mb_type)
 {
-    const int mb_xy = h->mb_xy;
+    const int mb_xy = sl->mb_xy;
     int topleft_xy, top_xy, topright_xy, left_xy[LEFT_MBS];
     static const uint8_t left_block_options[4][32] = {
         { 0, 1, 2, 3, 7, 10, 8, 11, 3 + 0 * 4, 3 + 1 * 4, 3 + 2 * 4, 3 + 3 * 4, 1 + 4 * 4, 1 + 8 * 4, 1 + 5 * 4, 1 + 9 * 4 },
@@ -357,9 +364,9 @@ static void fill_decode_neighbors(H264Context *h, int mb_type)
         { 0, 2, 0, 2, 7, 10, 7, 10, 3 + 0 * 4, 3 + 2 * 4, 3 + 0 * 4, 3 + 2 * 4, 1 + 4 * 4, 1 + 8 * 4, 1 + 4 * 4, 1 + 8 * 4 }
     };
 
-    h->topleft_partition = -1;
+    sl->topleft_partition = -1;
 
-    top_xy = mb_xy - (h->mb_stride << MB_FIELD(h));
+    top_xy = mb_xy - (h->mb_stride << MB_FIELD(sl));
 
     /* Wow, what a mess, why didn't they simplify the interlacing & intra
      * stuff, I can't imagine that these complex rules are worth it. */
@@ -367,22 +374,22 @@ static void fill_decode_neighbors(H264Context *h, int mb_type)
     topleft_xy    = top_xy - 1;
     topright_xy   = top_xy + 1;
     left_xy[LBOT] = left_xy[LTOP] = mb_xy - 1;
-    h->left_block = left_block_options[0];
+    sl->left_block = left_block_options[0];
     if (FRAME_MBAFF(h)) {
         const int left_mb_field_flag = IS_INTERLACED(h->cur_pic.mb_type[mb_xy - 1]);
         const int curr_mb_field_flag = IS_INTERLACED(mb_type);
-        if (h->mb_y & 1) {
+        if (sl->mb_y & 1) {
             if (left_mb_field_flag != curr_mb_field_flag) {
                 left_xy[LBOT] = left_xy[LTOP] = mb_xy - h->mb_stride - 1;
                 if (curr_mb_field_flag) {
                     left_xy[LBOT] += h->mb_stride;
-                    h->left_block  = left_block_options[3];
+                    sl->left_block  = left_block_options[3];
                 } else {
                     topleft_xy += h->mb_stride;
                     /* take top left mv from the middle of the mb, as opposed
                      * to all other modes which use the bottom right partition */
-                    h->topleft_partition = 0;
-                    h->left_block        = left_block_options[1];
+                    sl->topleft_partition = 0;
+                    sl->left_block        = left_block_options[1];
                 }
             }
         } else {
@@ -394,129 +401,129 @@ static void fill_decode_neighbors(H264Context *h, int mb_type)
             if (left_mb_field_flag != curr_mb_field_flag) {
                 if (curr_mb_field_flag) {
                     left_xy[LBOT] += h->mb_stride;
-                    h->left_block  = left_block_options[3];
+                    sl->left_block  = left_block_options[3];
                 } else {
-                    h->left_block = left_block_options[2];
+                    sl->left_block = left_block_options[2];
                 }
             }
         }
     }
 
-    h->topleft_mb_xy    = topleft_xy;
-    h->top_mb_xy        = top_xy;
-    h->topright_mb_xy   = topright_xy;
-    h->left_mb_xy[LTOP] = left_xy[LTOP];
-    h->left_mb_xy[LBOT] = left_xy[LBOT];
+    sl->topleft_mb_xy    = topleft_xy;
+    sl->top_mb_xy        = top_xy;
+    sl->topright_mb_xy   = topright_xy;
+    sl->left_mb_xy[LTOP] = left_xy[LTOP];
+    sl->left_mb_xy[LBOT] = left_xy[LBOT];
     //FIXME do we need all in the context?
 
-    h->topleft_type    = h->cur_pic.mb_type[topleft_xy];
-    h->top_type        = h->cur_pic.mb_type[top_xy];
-    h->topright_type   = h->cur_pic.mb_type[topright_xy];
-    h->left_type[LTOP] = h->cur_pic.mb_type[left_xy[LTOP]];
-    h->left_type[LBOT] = h->cur_pic.mb_type[left_xy[LBOT]];
+    sl->topleft_type    = h->cur_pic.mb_type[topleft_xy];
+    sl->top_type        = h->cur_pic.mb_type[top_xy];
+    sl->topright_type   = h->cur_pic.mb_type[topright_xy];
+    sl->left_type[LTOP] = h->cur_pic.mb_type[left_xy[LTOP]];
+    sl->left_type[LBOT] = h->cur_pic.mb_type[left_xy[LBOT]];
 
     if (FMO) {
-        if (h->slice_table[topleft_xy] != h->slice_num)
-            h->topleft_type = 0;
-        if (h->slice_table[top_xy] != h->slice_num)
-            h->top_type = 0;
-        if (h->slice_table[left_xy[LTOP]] != h->slice_num)
-            h->left_type[LTOP] = h->left_type[LBOT] = 0;
+        if (h->slice_table[topleft_xy] != sl->slice_num)
+            sl->topleft_type = 0;
+        if (h->slice_table[top_xy] != sl->slice_num)
+            sl->top_type = 0;
+        if (h->slice_table[left_xy[LTOP]] != sl->slice_num)
+            sl->left_type[LTOP] = sl->left_type[LBOT] = 0;
     } else {
-        if (h->slice_table[topleft_xy] != h->slice_num) {
-            h->topleft_type = 0;
-            if (h->slice_table[top_xy] != h->slice_num)
-                h->top_type = 0;
-            if (h->slice_table[left_xy[LTOP]] != h->slice_num)
-                h->left_type[LTOP] = h->left_type[LBOT] = 0;
+        if (h->slice_table[topleft_xy] != sl->slice_num) {
+            sl->topleft_type = 0;
+            if (h->slice_table[top_xy] != sl->slice_num)
+                sl->top_type = 0;
+            if (h->slice_table[left_xy[LTOP]] != sl->slice_num)
+                sl->left_type[LTOP] = sl->left_type[LBOT] = 0;
         }
     }
-    if (h->slice_table[topright_xy] != h->slice_num)
-        h->topright_type = 0;
+    if (h->slice_table[topright_xy] != sl->slice_num)
+        sl->topright_type = 0;
 }
 
-static void fill_decode_caches(H264Context *h, int mb_type)
+static void fill_decode_caches(const H264Context *h, H264SliceContext *sl, int mb_type)
 {
     int topleft_xy, top_xy, topright_xy, left_xy[LEFT_MBS];
     int topleft_type, top_type, topright_type, left_type[LEFT_MBS];
-    const uint8_t *left_block = h->left_block;
+    const uint8_t *left_block = sl->left_block;
     int i;
     uint8_t *nnz;
     uint8_t *nnz_cache;
 
-    topleft_xy      = h->topleft_mb_xy;
-    top_xy          = h->top_mb_xy;
-    topright_xy     = h->topright_mb_xy;
-    left_xy[LTOP]   = h->left_mb_xy[LTOP];
-    left_xy[LBOT]   = h->left_mb_xy[LBOT];
-    topleft_type    = h->topleft_type;
-    top_type        = h->top_type;
-    topright_type   = h->topright_type;
-    left_type[LTOP] = h->left_type[LTOP];
-    left_type[LBOT] = h->left_type[LBOT];
+    topleft_xy      = sl->topleft_mb_xy;
+    top_xy          = sl->top_mb_xy;
+    topright_xy     = sl->topright_mb_xy;
+    left_xy[LTOP]   = sl->left_mb_xy[LTOP];
+    left_xy[LBOT]   = sl->left_mb_xy[LBOT];
+    topleft_type    = sl->topleft_type;
+    top_type        = sl->top_type;
+    topright_type   = sl->topright_type;
+    left_type[LTOP] = sl->left_type[LTOP];
+    left_type[LBOT] = sl->left_type[LBOT];
 
     if (!IS_SKIP(mb_type)) {
         if (IS_INTRA(mb_type)) {
-            int type_mask = h->pps.constrained_intra_pred ? IS_INTRA(-1) : -1;
-            h->topleft_samples_available      =
-                h->top_samples_available      =
-                    h->left_samples_available = 0xFFFF;
-            h->topright_samples_available     = 0xEEEA;
+            int type_mask = h->ps.pps->constrained_intra_pred ? IS_INTRA(-1) : -1;
+            sl->topleft_samples_available     =
+                sl->top_samples_available     =
+                    sl->left_samples_available = 0xFFFF;
+            sl->topright_samples_available     = 0xEEEA;
 
             if (!(top_type & type_mask)) {
-                h->topleft_samples_available  = 0xB3FF;
-                h->top_samples_available      = 0x33FF;
-                h->topright_samples_available = 0x26EA;
+                sl->topleft_samples_available  = 0xB3FF;
+                sl->top_samples_available      = 0x33FF;
+                sl->topright_samples_available = 0x26EA;
             }
             if (IS_INTERLACED(mb_type) != IS_INTERLACED(left_type[LTOP])) {
                 if (IS_INTERLACED(mb_type)) {
                     if (!(left_type[LTOP] & type_mask)) {
-                        h->topleft_samples_available &= 0xDFFF;
-                        h->left_samples_available    &= 0x5FFF;
+                        sl->topleft_samples_available &= 0xDFFF;
+                        sl->left_samples_available    &= 0x5FFF;
                     }
                     if (!(left_type[LBOT] & type_mask)) {
-                        h->topleft_samples_available &= 0xFF5F;
-                        h->left_samples_available    &= 0xFF5F;
+                        sl->topleft_samples_available &= 0xFF5F;
+                        sl->left_samples_available    &= 0xFF5F;
                     }
                 } else {
                     int left_typei = h->cur_pic.mb_type[left_xy[LTOP] + h->mb_stride];
 
                     assert(left_xy[LTOP] == left_xy[LBOT]);
                     if (!((left_typei & type_mask) && (left_type[LTOP] & type_mask))) {
-                        h->topleft_samples_available &= 0xDF5F;
-                        h->left_samples_available    &= 0x5F5F;
+                        sl->topleft_samples_available &= 0xDF5F;
+                        sl->left_samples_available    &= 0x5F5F;
                     }
                 }
             } else {
                 if (!(left_type[LTOP] & type_mask)) {
-                    h->topleft_samples_available &= 0xDF5F;
-                    h->left_samples_available    &= 0x5F5F;
+                    sl->topleft_samples_available &= 0xDF5F;
+                    sl->left_samples_available    &= 0x5F5F;
                 }
             }
 
             if (!(topleft_type & type_mask))
-                h->topleft_samples_available &= 0x7FFF;
+                sl->topleft_samples_available &= 0x7FFF;
 
             if (!(topright_type & type_mask))
-                h->topright_samples_available &= 0xFBFF;
+                sl->topright_samples_available &= 0xFBFF;
 
             if (IS_INTRA4x4(mb_type)) {
                 if (IS_INTRA4x4(top_type)) {
-                    AV_COPY32(h->intra4x4_pred_mode_cache + 4 + 8 * 0, h->intra4x4_pred_mode + h->mb2br_xy[top_xy]);
+                    AV_COPY32(sl->intra4x4_pred_mode_cache + 4 + 8 * 0, sl->intra4x4_pred_mode + h->mb2br_xy[top_xy]);
                 } else {
-                    h->intra4x4_pred_mode_cache[4 + 8 * 0] =
-                    h->intra4x4_pred_mode_cache[5 + 8 * 0] =
-                    h->intra4x4_pred_mode_cache[6 + 8 * 0] =
-                    h->intra4x4_pred_mode_cache[7 + 8 * 0] = 2 - 3 * !(top_type & type_mask);
+                    sl->intra4x4_pred_mode_cache[4 + 8 * 0] =
+                    sl->intra4x4_pred_mode_cache[5 + 8 * 0] =
+                    sl->intra4x4_pred_mode_cache[6 + 8 * 0] =
+                    sl->intra4x4_pred_mode_cache[7 + 8 * 0] = 2 - 3 * !(top_type & type_mask);
                 }
                 for (i = 0; i < 2; i++) {
                     if (IS_INTRA4x4(left_type[LEFT(i)])) {
-                        int8_t *mode = h->intra4x4_pred_mode + h->mb2br_xy[left_xy[LEFT(i)]];
-                        h->intra4x4_pred_mode_cache[3 + 8 * 1 + 2 * 8 * i] = mode[6 - left_block[0 + 2 * i]];
-                        h->intra4x4_pred_mode_cache[3 + 8 * 2 + 2 * 8 * i] = mode[6 - left_block[1 + 2 * i]];
+                        int8_t *mode = sl->intra4x4_pred_mode + h->mb2br_xy[left_xy[LEFT(i)]];
+                        sl->intra4x4_pred_mode_cache[3 + 8 * 1 + 2 * 8 * i] = mode[6 - left_block[0 + 2 * i]];
+                        sl->intra4x4_pred_mode_cache[3 + 8 * 2 + 2 * 8 * i] = mode[6 - left_block[1 + 2 * i]];
                     } else {
-                        h->intra4x4_pred_mode_cache[3 + 8 * 1 + 2 * 8 * i] =
-                        h->intra4x4_pred_mode_cache[3 + 8 * 2 + 2 * 8 * i] = 2 - 3 * !(left_type[LEFT(i)] & type_mask);
+                        sl->intra4x4_pred_mode_cache[3 + 8 * 1 + 2 * 8 * i] =
+                        sl->intra4x4_pred_mode_cache[3 + 8 * 2 + 2 * 8 * i] = 2 - 3 * !(left_type[LEFT(i)] & type_mask);
                     }
                 }
             }
@@ -532,7 +539,7 @@ static void fill_decode_caches(H264Context *h, int mb_type)
          */
         /* FIXME: constraint_intra_pred & partitioning & nnz
          * (let us hope this is just a typo in the spec) */
-        nnz_cache = h->non_zero_count_cache;
+        nnz_cache = sl->non_zero_count_cache;
         if (top_type) {
             nnz = h->non_zero_count[top_xy];
             AV_COPY32(&nnz_cache[4 + 8 * 0], &nnz[4 * 3]);
@@ -582,31 +589,31 @@ static void fill_decode_caches(H264Context *h, int mb_type)
         if (CABAC(h)) {
             // top_cbp
             if (top_type)
-                h->top_cbp = h->cbp_table[top_xy];
+                sl->top_cbp = h->cbp_table[top_xy];
             else
-                h->top_cbp = IS_INTRA(mb_type) ? 0x7CF : 0x00F;
+                sl->top_cbp = IS_INTRA(mb_type) ? 0x7CF : 0x00F;
             // left_cbp
             if (left_type[LTOP]) {
-                h->left_cbp =   (h->cbp_table[left_xy[LTOP]] & 0x7F0) |
+                sl->left_cbp =   (h->cbp_table[left_xy[LTOP]] & 0x7F0) |
                                ((h->cbp_table[left_xy[LTOP]] >> (left_block[0] & (~1))) & 2) |
                               (((h->cbp_table[left_xy[LBOT]] >> (left_block[2] & (~1))) & 2) << 2);
             } else {
-                h->left_cbp = IS_INTRA(mb_type) ? 0x7CF : 0x00F;
+                sl->left_cbp = IS_INTRA(mb_type) ? 0x7CF : 0x00F;
             }
         }
     }
 
-    if (IS_INTER(mb_type) || (IS_DIRECT(mb_type) && h->direct_spatial_mv_pred)) {
+    if (IS_INTER(mb_type) || (IS_DIRECT(mb_type) && sl->direct_spatial_mv_pred)) {
         int list;
         int b_stride = h->b_stride;
-        for (list = 0; list < h->list_count; list++) {
-            int8_t *ref_cache = &h->ref_cache[list][scan8[0]];
+        for (list = 0; list < sl->list_count; list++) {
+            int8_t *ref_cache = &sl->ref_cache[list][scan8[0]];
             int8_t *ref       = h->cur_pic.ref_index[list];
-            int16_t(*mv_cache)[2] = &h->mv_cache[list][scan8[0]];
+            int16_t(*mv_cache)[2] = &sl->mv_cache[list][scan8[0]];
             int16_t(*mv)[2]       = h->cur_pic.motion_val[list];
             if (!USES_LIST(mb_type, list))
                 continue;
-            assert(!(IS_DIRECT(mb_type) && !h->direct_spatial_mv_pred));
+            assert(!(IS_DIRECT(mb_type) && !sl->direct_spatial_mv_pred));
 
             if (USES_LIST(top_type, list)) {
                 const int b_xy = h->mb2b_xy[top_xy] + 3 * b_stride;
@@ -666,8 +673,8 @@ static void fill_decode_caches(H264Context *h, int mb_type)
             if (ref_cache[4 - 1 * 8] < 0) {
                 if (USES_LIST(topleft_type, list)) {
                     const int b_xy  = h->mb2b_xy[topleft_xy] + 3 + b_stride +
-                                      (h->topleft_partition & 2 * b_stride);
-                    const int b8_xy = 4 * topleft_xy + 1 + (h->topleft_partition & 2);
+                                      (sl->topleft_partition & 2 * b_stride);
+                    const int b8_xy = 4 * topleft_xy + 1 + (sl->topleft_partition & 2);
                     AV_COPY32(mv_cache[-1 - 1 * 8], mv[b_xy]);
                     ref_cache[-1 - 1 * 8] = ref[b8_xy];
                 } else {
@@ -681,8 +688,8 @@ static void fill_decode_caches(H264Context *h, int mb_type)
                 continue;
 
             if (!(mb_type & (MB_TYPE_SKIP | MB_TYPE_DIRECT2))) {
-                uint8_t(*mvd_cache)[2]   = &h->mvd_cache[list][scan8[0]];
-                uint8_t(*mvd)[2]         = h->mvd_table[list];
+                uint8_t(*mvd_cache)[2]   = &sl->mvd_cache[list][scan8[0]];
+                uint8_t(*mvd)[2]         = sl->mvd_table[list];
                 ref_cache[2 + 8 * 0] =
                 ref_cache[2 + 8 * 2] = PART_NOT_AVAILABLE;
                 AV_ZERO32(mv_cache[2 + 8 * 0]);
@@ -713,8 +720,8 @@ static void fill_decode_caches(H264Context *h, int mb_type)
                     }
                     AV_ZERO16(mvd_cache[2 + 8 * 0]);
                     AV_ZERO16(mvd_cache[2 + 8 * 2]);
-                    if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
-                        uint8_t *direct_cache = &h->direct_cache[scan8[0]];
+                    if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
+                        uint8_t *direct_cache = &sl->direct_cache[scan8[0]];
                         uint8_t *direct_table = h->direct_table;
                         fill_rectangle(direct_cache, 4, 4, 8, MB_TYPE_16x16 >> 1, 1);
 
@@ -760,13 +767,13 @@ static void fill_decode_caches(H264Context *h, int mb_type)
     MAP_F2F(scan8[0] - 1 + 3 * 8, left_type[LBOT])
 
             if (FRAME_MBAFF(h)) {
-                if (MB_FIELD(h)) {
+                if (MB_FIELD(sl)) {
 
 #define MAP_F2F(idx, mb_type)                                           \
-    if (!IS_INTERLACED(mb_type) && h->ref_cache[list][idx] >= 0) {      \
-        h->ref_cache[list][idx]    <<= 1;                               \
-        h->mv_cache[list][idx][1]   /= 2;                               \
-        h->mvd_cache[list][idx][1] >>= 1;                               \
+    if (!IS_INTERLACED(mb_type) && sl->ref_cache[list][idx] >= 0) {     \
+        sl->ref_cache[list][idx]    <<= 1;                              \
+        sl->mv_cache[list][idx][1]   /= 2;                              \
+        sl->mvd_cache[list][idx][1] >>= 1;                              \
     }
 
                     MAP_MVS
@@ -774,10 +781,10 @@ static void fill_decode_caches(H264Context *h, int mb_type)
 
 #undef MAP_F2F
 #define MAP_F2F(idx, mb_type)                                           \
-    if (IS_INTERLACED(mb_type) && h->ref_cache[list][idx] >= 0) {       \
-        h->ref_cache[list][idx]    >>= 1;                               \
-        h->mv_cache[list][idx][1]  <<= 1;                               \
-        h->mvd_cache[list][idx][1] <<= 1;                               \
+    if (IS_INTERLACED(mb_type) && sl->ref_cache[list][idx] >= 0) {      \
+        sl->ref_cache[list][idx]    >>= 1;                              \
+        sl->mv_cache[list][idx][1]  <<= 1;                              \
+        sl->mvd_cache[list][idx][1] <<= 1;                              \
     }
 
                     MAP_MVS
@@ -787,43 +794,43 @@ static void fill_decode_caches(H264Context *h, int mb_type)
         }
     }
 
-    h->neighbor_transform_size = !!IS_8x8DCT(top_type) + !!IS_8x8DCT(left_type[LTOP]);
+    sl->neighbor_transform_size = !!IS_8x8DCT(top_type) + !!IS_8x8DCT(left_type[LTOP]);
 }
 
 /**
  * decodes a P_SKIP or B_SKIP macroblock
  */
-static void av_unused decode_mb_skip(H264Context *h)
+static void av_unused decode_mb_skip(const H264Context *h, H264SliceContext *sl)
 {
-    const int mb_xy = h->mb_xy;
+    const int mb_xy = sl->mb_xy;
     int mb_type     = 0;
 
     memset(h->non_zero_count[mb_xy], 0, 48);
 
-    if (MB_FIELD(h))
+    if (MB_FIELD(sl))
         mb_type |= MB_TYPE_INTERLACED;
 
-    if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
+    if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
         // just for fill_caches. pred_direct_motion will set the real mb_type
         mb_type |= MB_TYPE_L0L1 | MB_TYPE_DIRECT2 | MB_TYPE_SKIP;
-        if (h->direct_spatial_mv_pred) {
-            fill_decode_neighbors(h, mb_type);
-            fill_decode_caches(h, mb_type); //FIXME check what is needed and what not ...
+        if (sl->direct_spatial_mv_pred) {
+            fill_decode_neighbors(h, sl, mb_type);
+            fill_decode_caches(h, sl, mb_type); //FIXME check what is needed and what not ...
         }
-        ff_h264_pred_direct_motion(h, &mb_type);
+        ff_h264_pred_direct_motion(h, sl, &mb_type);
         mb_type |= MB_TYPE_SKIP;
     } else {
         mb_type |= MB_TYPE_16x16 | MB_TYPE_P0L0 | MB_TYPE_P1L0 | MB_TYPE_SKIP;
 
-        fill_decode_neighbors(h, mb_type);
-        pred_pskip_motion(h);
+        fill_decode_neighbors(h, sl, mb_type);
+        pred_pskip_motion(h, sl);
     }
 
-    write_back_motion(h, mb_type);
+    write_back_motion(h, sl, mb_type);
     h->cur_pic.mb_type[mb_xy]      = mb_type;
-    h->cur_pic.qscale_table[mb_xy] = h->qscale;
-    h->slice_table[mb_xy]            = h->slice_num;
-    h->prev_mb_skipped               = 1;
+    h->cur_pic.qscale_table[mb_xy] = sl->qscale;
+    h->slice_table[mb_xy]          = sl->slice_num;
+    sl->prev_mb_skipped            = 1;
 }
 
 #endif /* AVCODEC_H264_MVPRED_H */