mpeg4video: K&R formatting cosmetics
[ffmpeg.git] / libavcodec / mpeg4video.c
index 9fab226..979904f 100644 (file)
@@ -3,20 +3,20 @@
  * Copyright (c) 2000,2001 Fabrice Bellard
  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "mpeg4video.h"
 #include "mpeg4data.h"
 
-uint8_t ff_mpeg4_static_rl_table_store[3][2][2*MAX_RUN + MAX_LEVEL + 3];
-
-int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s){
-    switch(s->pict_type){
-        case FF_I_TYPE:
-            return 16;
-        case FF_P_TYPE:
-        case FF_S_TYPE:
-            return s->f_code+15;
-        case FF_B_TYPE:
-            return FFMAX3(s->f_code, s->b_code, 2) + 15;
-        default:
-            return -1;
+uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];
+
+int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
+{
+    switch (s->pict_type) {
+    case AV_PICTURE_TYPE_I:
+        return 16;
+    case AV_PICTURE_TYPE_P:
+    case AV_PICTURE_TYPE_S:
+        return s->f_code + 15;
+    case AV_PICTURE_TYPE_B:
+        return FFMAX3(s->f_code, s->b_code, 2) + 15;
+    default:
+        return -1;
     }
 }
 
@@ -44,29 +45,148 @@ void ff_mpeg4_clean_buffers(MpegEncContext *s)
 {
     int c_wrap, c_xy, l_wrap, l_xy;
 
-    l_wrap= s->b8_stride;
-    l_xy= (2*s->mb_y-1)*l_wrap + s->mb_x*2 - 1;
-    c_wrap= s->mb_stride;
-    c_xy= (s->mb_y-1)*c_wrap + s->mb_x - 1;
+    l_wrap = s->b8_stride;
+    l_xy   = (2 * s->mb_y - 1) * l_wrap + s->mb_x * 2 - 1;
+    c_wrap = s->mb_stride;
+    c_xy   = (s->mb_y - 1) * c_wrap + s->mb_x - 1;
 
 #if 0
     /* clean DC */
-    memsetw(s->dc_val[0] + l_xy, 1024, l_wrap*2+1);
-    memsetw(s->dc_val[1] + c_xy, 1024, c_wrap+1);
-    memsetw(s->dc_val[2] + c_xy, 1024, c_wrap+1);
+    memsetw(s->dc_val[0] + l_xy, 1024, l_wrap * 2 + 1);
+    memsetw(s->dc_val[1] + c_xy, 1024, c_wrap + 1);
+    memsetw(s->dc_val[2] + c_xy, 1024, c_wrap + 1);
 #endif
 
     /* clean AC */
-    memset(s->ac_val[0] + l_xy, 0, (l_wrap*2+1)*16*sizeof(int16_t));
-    memset(s->ac_val[1] + c_xy, 0, (c_wrap  +1)*16*sizeof(int16_t));
-    memset(s->ac_val[2] + c_xy, 0, (c_wrap  +1)*16*sizeof(int16_t));
+    memset(s->ac_val[0] + l_xy, 0, (l_wrap * 2 + 1) * 16 * sizeof(int16_t));
+    memset(s->ac_val[1] + c_xy, 0, (c_wrap     + 1) * 16 * sizeof(int16_t));
+    memset(s->ac_val[2] + c_xy, 0, (c_wrap     + 1) * 16 * sizeof(int16_t));
 
     /* clean MV */
     // we can't clear the MVs as they might be needed by a b frame
-//    memset(s->motion_val + l_xy, 0, (l_wrap*2+1)*2*sizeof(int16_t));
-//    memset(s->motion_val, 0, 2*sizeof(int16_t)*(2 + s->mb_width*2)*(2 + s->mb_height*2));
-    s->last_mv[0][0][0]=
-    s->last_mv[0][0][1]=
-    s->last_mv[1][0][0]=
-    s->last_mv[1][0][1]= 0;
+//    memset(s->motion_val + l_xy, 0, (l_wrap * 2 + 1) * 2 * sizeof(int16_t));
+//    memset(s->motion_val, 0, 2 * sizeof(int16_t) * (2 + s->mb_width * 2) *
+//           (2 + s->mb_height * 2));
+    s->last_mv[0][0][0] =
+    s->last_mv[0][0][1] =
+    s->last_mv[1][0][0] =
+    s->last_mv[1][0][1] = 0;
+}
+
+#define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
+#define tab_bias (tab_size / 2)
+
+// used by mpeg4 and rv10 decoder
+void ff_mpeg4_init_direct_mv(MpegEncContext *s)
+{
+    int i;
+    for (i = 0; i < tab_size; i++) {
+        s->direct_scale_mv[0][i] = (i - tab_bias) * s->pb_time / s->pp_time;
+        s->direct_scale_mv[1][i] = (i - tab_bias) * (s->pb_time - s->pp_time) /
+                                   s->pp_time;
+    }
+}
+
+static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx,
+                                              int my, int i)
+{
+    int xy           = s->block_index[i];
+    uint16_t time_pp = s->pp_time;
+    uint16_t time_pb = s->pb_time;
+    int p_mx, p_my;
+
+    p_mx = s->next_picture.motion_val[0][xy][0];
+    if ((unsigned)(p_mx + tab_bias) < tab_size) {
+        s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias] + mx;
+        s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
+                            : s->direct_scale_mv[1][p_mx + tab_bias];
+    } else {
+        s->mv[0][i][0] = p_mx * time_pb / time_pp + mx;
+        s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
+                            : p_mx * (time_pb - time_pp) / time_pp;
+    }
+    p_my = s->next_picture.motion_val[0][xy][1];
+    if ((unsigned)(p_my + tab_bias) < tab_size) {
+        s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias] + my;
+        s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
+                            : s->direct_scale_mv[1][p_my + tab_bias];
+    } else {
+        s->mv[0][i][1] = p_my * time_pb / time_pp + my;
+        s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
+                            : p_my * (time_pb - time_pp) / time_pp;
+    }
+}
+
+#undef tab_size
+#undef tab_bias
+
+/**
+ * @return the mb_type
+ */
+int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
+{
+    const int mb_index          = s->mb_x + s->mb_y * s->mb_stride;
+    const int colocated_mb_type = s->next_picture.mb_type[mb_index];
+    uint16_t time_pp;
+    uint16_t time_pb;
+    int i;
+
+    // FIXME avoid divides
+    // try special case with shifts for 1 and 3 B-frames?
+
+    if (IS_8X8(colocated_mb_type)) {
+        s->mv_type = MV_TYPE_8X8;
+        for (i = 0; i < 4; i++)
+            ff_mpeg4_set_one_direct_mv(s, mx, my, i);
+        return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
+    } else if (IS_INTERLACED(colocated_mb_type)) {
+        s->mv_type = MV_TYPE_FIELD;
+        for (i = 0; i < 2; i++) {
+            int field_select = s->next_picture.ref_index[0][4 * mb_index + 2 * i];
+            s->field_select[0][i] = field_select;
+            s->field_select[1][i] = i;
+            if (s->top_field_first) {
+                time_pp = s->pp_field_time - field_select + i;
+                time_pb = s->pb_field_time - field_select + i;
+            } else {
+                time_pp = s->pp_field_time + field_select - i;
+                time_pb = s->pb_field_time + field_select - i;
+            }
+            s->mv[0][i][0] = s->p_field_mv_table[i][0][mb_index][0] *
+                             time_pb / time_pp + mx;
+            s->mv[0][i][1] = s->p_field_mv_table[i][0][mb_index][1] *
+                             time_pb / time_pp + my;
+            s->mv[1][i][0] = mx ? s->mv[0][i][0] -
+                                  s->p_field_mv_table[i][0][mb_index][0]
+                                : s->p_field_mv_table[i][0][mb_index][0] *
+                                  (time_pb - time_pp) / time_pp;
+            s->mv[1][i][1] = my ? s->mv[0][i][1] -
+                                  s->p_field_mv_table[i][0][mb_index][1]
+                                : s->p_field_mv_table[i][0][mb_index][1] *
+                                  (time_pb - time_pp) / time_pp;
+        }
+        return MB_TYPE_DIRECT2 | MB_TYPE_16x8 |
+               MB_TYPE_L0L1    | MB_TYPE_INTERLACED;
+    } else {
+        ff_mpeg4_set_one_direct_mv(s, mx, my, 0);
+        s->mv[0][1][0] =
+        s->mv[0][2][0] =
+        s->mv[0][3][0] = s->mv[0][0][0];
+        s->mv[0][1][1] =
+        s->mv[0][2][1] =
+        s->mv[0][3][1] = s->mv[0][0][1];
+        s->mv[1][1][0] =
+        s->mv[1][2][0] =
+        s->mv[1][3][0] = s->mv[1][0][0];
+        s->mv[1][1][1] =
+        s->mv[1][2][1] =
+        s->mv[1][3][1] = s->mv[1][0][1];
+        if ((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) ||
+            !s->quarter_sample)
+            s->mv_type = MV_TYPE_16X16;
+        else
+            s->mv_type = MV_TYPE_8X8;
+        // Note see prev line
+        return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1;
+    }
 }