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Diffstat (limited to 'ffmpeg/libavcodec/mpeg4video.c')
-rw-r--r--ffmpeg/libavcodec/mpeg4video.c170
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
+ }
+}
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