changes_rm52i.txt

avs-s最新代码,包括编码器和解码器源码

一. VEC问题： based on AVS-M1956 by Grandview Semi.
Encoder:
1. picture_header() in image.c
   * row 159, 183
      write the VEC_EXT byte to bitstream
   * row 170, 194
      force to write the value 3 to bitstream 
      because of the first I picture

2. PartitionMotionSearch()     in mv-search.c
   PartitionMotionSearch_bid() in mv-search.c
   * row 1982, 2087
      force the cost to maximum when forward precition

3. encode_one_macroblock() in rdopt.c
   * row 1903
      skip the Direct_B8x8  prediction
   * row 2403
      skip the Direct_16x16 prediction
   * row 2406~2409, 2461~2462
      skip the situation wehn vec_ext = 3

4. image.c
   misc modification only for displaying more information
   about VEC status.

Decoder:
1. Header() in image.c
   * row 720~728
      if finds the vec_flag and vec_ext is 1,
         the current B picture should be discarded,
         and find the next start code,
      otherwise,
         begin decoding for current picture.
   * row 734~740
      discard the middle slice_header start codes.

2. decode_one_frame() in image.c
   * row 235~256
   pls focus on 'vec_pr_flag'.
   misc modification only for displaying more information
   about VEC status.
   
 二. IDCT问题 浙大修改
 **Encoder:
inv_transform_B8() in block.c
Line:357~364 changed as
	 curr_blk[yy][0]=((__int16)((__int16)(b[0]+b[4])+4))>>3;
	 curr_blk[yy][1]=((__int16)((__int16)(b[1]+b[5])+4))>>3;
	 curr_blk[yy][2]=((__int16)((__int16)(b[2]+b[6])+4))>>3;
	 curr_blk[yy][3]=((__int16)((__int16)(b[3]+b[7])+4))>>3;
	 curr_blk[yy][7]=((__int16)((__int16)(b[0]-b[4])+4))>>3;
	 curr_blk[yy][6]=((__int16)((__int16)(b[1]-b[5])+4))>>3;
	 curr_blk[yy][5]=((__int16)((__int16)(b[2]-b[6])+4))>>3;
	 curr_blk[yy][4]=((__int16)((__int16)(b[3]-b[7])+4))>>3;

Line:421~428 changed as
	 curr_blk[0][xx]=((__int16)((__int16)(b[0]+b[4])+64))>>7;
	 curr_blk[1][xx]=((__int16)((__int16)(b[1]+b[5])+64))>>7;
	 curr_blk[2][xx]=((__int16)((__int16)(b[2]+b[6])+64))>>7;
	 curr_blk[3][xx]=((__int16)((__int16)(b[3]+b[7])+64))>>7;
	 curr_blk[7][xx]=((__int16)((__int16)(b[0]-b[4])+64))>>7;
	 curr_blk[6][xx]=((__int16)((__int16)(b[1]-b[5])+64))>>7;
	 curr_blk[5][xx]=((__int16)((__int16)(b[2]-b[6])+64))>>7;
	 curr_blk[4][xx]=((__int16)((__int16)(b[3]-b[7])+64))>>7;
	 
**Decoder:
inv_transform_B8() in block.c
Line:150~157 changed as
	 curr_blk[yy][0]=((__int16)((__int16)(b[0]+b[4])+4))>>3;
	 curr_blk[yy][1]=((__int16)((__int16)(b[1]+b[5])+4))>>3;
	 curr_blk[yy][2]=((__int16)((__int16)(b[2]+b[6])+4))>>3;
	 curr_blk[yy][3]=((__int16)((__int16)(b[3]+b[7])+4))>>3;
	 curr_blk[yy][7]=((__int16)((__int16)(b[0]-b[4])+4))>>3;
	 curr_blk[yy][6]=((__int16)((__int16)(b[1]-b[5])+4))>>3;
	 curr_blk[yy][5]=((__int16)((__int16)(b[2]-b[6])+4))>>3;
	 curr_blk[yy][4]=((__int16)((__int16)(b[3]-b[7])+4))>>3;

Line:224~231 changed as
	 curr_blk[0][xx]=((__int16)((__int16)(b[0]+b[4])+64))>>7;
	 curr_blk[1][xx]=((__int16)((__int16)(b[1]+b[5])+64))>>7;
	 curr_blk[2][xx]=((__int16)((__int16)(b[2]+b[6])+64))>>7;
	 curr_blk[3][xx]=((__int16)((__int16)(b[3]+b[7])+64))>>7;
	 curr_blk[7][xx]=((__int16)((__int16)(b[0]-b[4])+64))>>7;
	 curr_blk[6][xx]=((__int16)((__int16)(b[1]-b[5])+64))>>7;
	 curr_blk[5][xx]=((__int16)((__int16)(b[2]-b[6])+64))>>7;
	 curr_blk[4][xx]=((__int16)((__int16)(b[3]-b[7])+64))>>7;
	 
	 三. MAX_SYMBOLS_PER_MB 问题  清华大学修改
based on output of AVS zhuhai about the AVS-M1942

Encoder:

1. global.h
 
  * row 532
   change the difinition of MB_SyntaxElements

2. lencod.c

  * row 314
   allocate the memory for MB_SyntaxElements
   the size is (img->height*img->width/256)+1200

3. lencod.c

  *row 392
  free the memory 

四. reserved bit 问题  法国电信修改
(based on output of AVS zhuhai about the AVS-M1936 and mail from gaoyanjun
Encoder:

1. bitstream.c
  *line 706-708
   add WriteCopyrightExtension() and WriteCameraParametersExtension() to function         start_sequence()

2. bitstream.c 
   *line 504-591
   revise function WriteCameraParametersExtension() according to newest AVS1-P2            specification AVS_N1349 page 19-20

3. bitstream.c
  *line 443-491
   revise function WriteCopyrightExtension() according to newest AVS1-P2 pecification       AVS_N1349 page 19


Decoder:

1. header.c
   *line 433-481
   revise function cameraparameters_extension() according to newest AVS1-P2 pecification      AVS_N1349 page 19-20

2. header.c 
   *line 334-366
   implement picture_display_extension() according to newest AVS1-P2 specification          AVS_N1349 page 22 and page 37

2. header.c
   *line 286-287
   add picture_display_extension() to function extension_data(char *buf,int startcodepos,     int length) according to newest AVS1-P2 specification AVS_N1349 page 17-18

五.M1929修改软件部分   清华大学修改

Encoder:
1.header.c
  * line 320
  * line 319
decoder:
1.header.c
  * line 578
2.macroblock.c
  * line 520 ,521,802,817
  
六 一致性测试 ：9.5	参考代码中视频码流的第一个序列头部分掉了0x80问题  清华大学修改
Encoder:
1.bitstream.c
 * line 56 265 183

Decoder:
   image.c   
    line 116
   header.c
   line 73

七 一致性测试：9.10 参考代码中运动矢量还是会超出边界16个像素之外问题 清华大学修改
encoder:
1.fastme.c
*line 802~821
* line 1748~1765
2.mv-search.c
 * line 1422~1441
  line 1635~1656
  
八. 一致性测试：9.12	bbv_buffer_size问题 清华大学修改
encoder
1.bitstream.c
* line 250


九. 一致性测试：9.6     picture_distance问题  清华大学修改
encoder
1. int calculate_distance(int blkref, int fw_bw )  mv-serach.c  Ln93-214  见注释// Tsinghua 200701
2. image()  Ln788  见注释// Tsinghua 200701
3. main()   Ln152,154, 225

十.mb_delta_qp的问题 参考代码原来的处理为正确的(参考前面一个MB的qp值),具体位置
decoder        macroblock.c  line 1212 

十一. 20070204后解决的问题
1. deocoder  bitstream.c 删除寻找起始码的条件 line 291
//	if(img->current_mb_nr == 0) //commented by cjw AVS 20070204
//	{
//		if(StartCodePosition>6 && StartCodePosition<20)
//		   return 1;
//		else
//		{
//		   currStream->frame_bitoffset = currentbitoffset;
//		   return 0;
//		}
//	}

2. encoder bitstream.c 注释掉679行，在一幅图像结尾后不应该再次对齐
//   write_align_stuff(pORABS);       //commented by cjw AVS 20070204

3. encoder lencod.c line148 修改picture_distance的计算方法1
    if(img->number==0) //modified by cjw AVS 20070204  S1pec. 7.2.3.1
      picture_distance = 0;
    else
   {
      if(img->type==B_IMG)
          picture_distance = ((IMG_NUMBER - 1) * (input->jumpd + 1) + img->b_interval * img->b_frame_to_code)%256;	// Tsinghua 200701
      else
          picture_distance = (IMG_NUMBER * (input->jumpd + 1))%256;	// Tsinghua 200701
    }