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|
/*
+--------------------------------------------------------------------------+
| CHStone : a suite of benchmark programs for C-based High-Level Synthesis |
| ======================================================================== |
| |
| * Collected and Modified : Y. Hara, H. Tomiyama, S. Honda, |
| H. Takada and K. Ishii |
| Nagoya University, Japan |
| |
| * Remark : |
| 1. This source code is modified to unify the formats of the benchmark |
| programs in CHStone. |
| 2. Test vectors are added for CHStone. |
| 3. If "main_result" is 0 at the end of the program, the program is |
| correctly executed. |
| 4. Please follow the copyright of each benchmark program. |
+--------------------------------------------------------------------------+
*/
/* motion.c, motion vector decoding */
/* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */
/*
* Disclaimer of Warranty
*
* These software programs are available to the user without any license fee or
* royalty on an "as is" basis. The MPEG Software Simulation Group disclaims
* any and all warranties, whether express, implied, or statuary, including any
* implied warranties or merchantability or of fitness for a particular
* purpose. In no event shall the copyright-holder be liable for any
* incidental, punitive, or consequential damages of any kind whatsoever
* arising from the use of these programs.
*
* This disclaimer of warranty extends to the user of these programs and user's
* customers, employees, agents, transferees, successors, and assigns.
*
* The MPEG Software Simulation Group does not represent or warrant that the
* programs furnished hereunder are free of infringement of any third-party
* patents.
*
* Commercial implementations of MPEG-1 and MPEG-2 video, including shareware,
* are subject to royalty fees to patent holders. Many of these patents are
* general enough such that they are unavoidable regardless of implementation
* design.
*
*/
/* private prototypes */
static void decode_motion_vector
_ANSI_ARGS_ ((int *pred, int r_size, int motion_code,
int motion_residualesidual, int full_pel_vector));
/* ISO/IEC 13818-2 sections 6.2.5.2, 6.3.17.2, and 7.6.3: Motion vectors */
void
motion_vectors (PMV, dmvector, motion_vertical_field_select, s,
motion_vector_count, mv_format, h_r_size, v_r_size, dmv,
mvscale)
int PMV[2][2][2];
int dmvector[2];
int motion_vertical_field_select[2][2];
int s, motion_vector_count, mv_format, h_r_size, v_r_size, dmv, mvscale;
{
if (motion_vector_count == 1)
{
if (mv_format == MV_FIELD && !dmv)
{
motion_vertical_field_select[1][s] =
motion_vertical_field_select[0][s] = Get_Bits (1);
}
motion_vector (PMV[0][s], dmvector, h_r_size, v_r_size, dmv, mvscale,
0);
/* update other motion vector predictors */
PMV[1][s][0] = PMV[0][s][0];
PMV[1][s][1] = PMV[0][s][1];
}
else
{
motion_vertical_field_select[0][s] = Get_Bits (1);
motion_vector (PMV[0][s], dmvector, h_r_size, v_r_size, dmv, mvscale,
0);
motion_vertical_field_select[1][s] = Get_Bits (1);
motion_vector (PMV[1][s], dmvector, h_r_size, v_r_size, dmv, mvscale,
0);
}
}
/* get and decode motion vector and differential motion vector
for one prediction */
void
motion_vector (PMV, dmvector, h_r_size, v_r_size, dmv, mvscale,
full_pel_vector)
int *PMV;
int *dmvector;
int h_r_size;
int v_r_size;
int dmv; /* MPEG-2 only: get differential motion vectors */
int mvscale; /* MPEG-2 only: field vector in frame pic */
int full_pel_vector; /* MPEG-1 only */
{
int motion_code;
int motion_residual;
/* horizontal component */
/* ISO/IEC 13818-2 Table B-10 */
motion_code = Get_motion_code ();
motion_residual = (h_r_size != 0
&& motion_code != 0) ? Get_Bits (h_r_size) : 0;
decode_motion_vector (&PMV[0], h_r_size, motion_code, motion_residual,
full_pel_vector);
if (dmv)
dmvector[0] = Get_dmvector ();
/* vertical component */
motion_code = Get_motion_code ();
motion_residual = (v_r_size != 0
&& motion_code != 0) ? Get_Bits (v_r_size) : 0;
if (mvscale)
PMV[1] >>= 1; /* DIV 2 */
decode_motion_vector (&PMV[1], v_r_size, motion_code, motion_residual,
full_pel_vector);
if (mvscale)
PMV[1] <<= 1;
if (dmv)
dmvector[1] = Get_dmvector ();
}
/* calculate motion vector component */
/* ISO/IEC 13818-2 section 7.6.3.1: Decoding the motion vectors */
/* Note: the arithmetic here is more elegant than that which is shown
in 7.6.3.1. The end results (PMV[][][]) should, however, be the same. */
static void
decode_motion_vector (pred, r_size, motion_code, motion_residual,
full_pel_vector)
int *pred;
int r_size, motion_code, motion_residual;
int full_pel_vector; /* MPEG-1 (ISO/IEC 11172-1) support */
{
int lim, vec;
r_size = r_size % 32;
lim = 16 << r_size;
vec = full_pel_vector ? (*pred >> 1) : (*pred);
if (motion_code > 0)
{
vec += ((motion_code - 1) << r_size) + motion_residual + 1;
if (vec >= lim)
vec -= lim + lim;
}
else if (motion_code < 0)
{
vec -= ((-motion_code - 1) << r_size) + motion_residual + 1;
if (vec < -lim)
vec += lim + lim;
}
*pred = full_pel_vector ? (vec << 1) : vec;
}
|
