making act segmenter

1 files changed, 170 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/mpeg4video.c b/ffmpeg/libavcodec/mpeg4video.c
new file mode 100644
index 0000000..9b86997
--- /dev/null
+++ b/ffmpeg/libavcodec/mpeg4video.c
@@ -0,0 +1,170 @@
+/*
+ * MPEG4 decoder / encoder common code.
+ * Copyright (c) 2000,2001 Fabrice Bellard
+ * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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,
+ * 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "mpegvideo.h"
+#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 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;
+    }
+}
+
+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;
+
+#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);
+#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));
+
+    /* 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;
+}
+
+#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;
+        return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1; //Note see prev line
+    }
+}