Split the mpeg4 encoder and decoder off h263.c

Originally committed as revision 21079 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 72 insertions, 0 deletions

diff --git a/libavcodec/mpeg4video.c b/libavcodec/mpeg4video.c
new file mode 100644
index 0000000000..9fab226ba8
--- /dev/null
+++ b/libavcodec/mpeg4video.c
@@ -0,0 +1,72 @@
+/*
+ * 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 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;
+    }
+}
+
+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;
+}