+++ /dev/null
-/*****************************************************************************
- * vpar_motion.c : motion vectors parsing
- * (c)1999 VideoLAN
- *****************************************************************************/
-
-/*****************************************************************************
- * Preamble
- *****************************************************************************/
-
-
-#include <errno.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <string.h>
-#include <sys/uio.h>
-
-#include "config.h"
-#include "common.h"
-#include "mtime.h"
-#include "vlc_thread.h"
-
-#include "intf_msg.h"
-#include "debug.h" /* ?? temporaire, requis par netlist.h */
-
-#include "input.h"
-#include "input_netlist.h"
-#include "decoder_fifo.h"
-#include "video.h"
-#include "video_output.h"
-
-#include "vdec_idct.h"
-#include "video_decoder.h"
-#include "vdec_motion.h"
-
-#include "vpar_blocks.h"
-#include "vpar_headers.h"
-#include "vpar_synchro.h"
-#include "video_parser.h"
-#include "vpar_motion.h"
-#include "video_fifo.h"
-
-
-/*
- * Local prototypes
- */
-
-/****************************************************************************
- * vpar_MotionCode : Parse the next motion code
- ****************************************************************************/
-static __inline__ int vpar_MotionCode( vpar_thread_t * p_vpar )
-{
- int i_code;
- static lookup_t pl_mv_tab0[8] =
- { {-1,0}, {3,3}, {2,2}, {2,2}, {1,1}, {1,1}, {1,1}, {1,1} };
- /* Table B-10, motion_code, codes 0000011 ... 000011x */
- static lookup_t pl_mv_tab1[8] =
- { {-1,0}, {-1,0}, {-1,0}, {7,6}, {6,6}, {5,6}, {4,5}, {4,5} };
- /* Table B-10, motion_code, codes 0000001100 ... 000001011x */
- static lookup_t pl_mv_tab2[12] = {
- {16,9}, {15,9}, {14,9}, {13,9},
- {12,9}, {11,9}, {10,8}, {10,8},
- {9,8}, {9,8}, {8,8}, {8,8} };
-
- if( GetBits(&p_vpar->bit_stream, 1) )
- {
- return 0;
- }
- if( (i_code = ShowBits(&p_vpar->bit_stream, 9)) >= 64 )
- {
- i_code >>= 6;
- RemoveBits( &p_vpar->bit_stream, pl_mv_tab0[i_code].i_length );
- return( GetBits(&p_vpar->bit_stream, 1) ? -pl_mv_tab0[i_code].i_value : pl_mv_tab0[i_code].i_value );
- }
-
- if( i_code >= 24 )
- {
- i_code >>= 3;
- RemoveBits( &p_vpar->bit_stream, pl_mv_tab1[i_code].i_length );
- return( GetBits(&p_vpar->bit_stream, 1) ? -pl_mv_tab1[i_code].i_value : pl_mv_tab1[i_code].i_value );
- }
-
- if( (i_code -= 12) < 0 )
- {
- p_vpar->picture.b_error = 1;
- intf_DbgMsg( "vpar debug: Invalid motion_vector code\n" );
- return 0;
- }
-
- RemoveBits( &p_vpar->bit_stream, pl_mv_tab2[i_code].i_length );
- return( GetBits(&p_vpar->bit_stream, 1) ? -pl_mv_tab2[i_code].i_value : pl_mv_tab2[i_code].i_value );
-}
-
-/****************************************************************************
- * vpar_DecodeMotionVector : decode a motion_vector
- ****************************************************************************/
-static __inline__ void vpar_DecodeMotionVector( int * pi_prediction, int i_r_size,
- int i_motion_code, int i_motion_residual, int i_full_pel )
-{
- int i_limit, i_vector;
-
- /* ISO/IEC 13818-1 section 7.6.3.1 */
- i_limit = 16 << i_r_size;
- i_vector = *pi_prediction >> i_full_pel;
-
- if( i_motion_code > 0 )
- {
- i_vector += ((i_motion_code-1) << i_r_size) + i_motion_residual + 1;
- if( i_vector >= i_limit )
- i_vector -= i_limit + i_limit;
- }
- else if( i_motion_code < 0 )
- {
- i_vector -= ((-i_motion_code-1) << i_r_size) + i_motion_residual + 1;
- if( i_vector < -i_limit )
- i_vector += i_limit + i_limit;
- }
- *pi_prediction = i_vector << i_full_pel;
-}
-
-/****************************************************************************
- * vpar_MotionVector : Parse the next motion_vector field
- ****************************************************************************/
-void vpar_MotionVector( vpar_thread_t * p_vpar, macroblock_t * p_mb, int i_r,
- int i_s, int i_full_pel )
-{
- int i_motion_code, i_motion_residual;
- int i_r_size;
- int pi_dm_vector[2];
-
- i_r_size = p_vpar->picture.ppi_f_code[i_s][0]-1;
- i_motion_code = vpar_MotionCode( p_vpar );
- i_motion_residual = (i_r_size != 0 && i_motion_code != 0) ?
- GetBits( &p_vpar->bit_stream, i_r_size) : 0;
- vpar_DecodeMotionVector( &p_vpar->slice.pppi_pmv[i_r][i_s][0], i_r_size,
- i_motion_code, i_motion_residual, i_full_pel );
- p_mb->pppi_motion_vectors[i_r][i_s][0] = p_vpar->slice.pppi_pmv[i_r][i_s][0];
-
-
- if( p_vpar->mb.b_dmv )
- {
- if( GetBits(&p_vpar->bit_stream, 1) )
- {
- pi_dm_vector[0] = GetBits( &p_vpar->bit_stream, 1 ) ? -1 : 1;
- }
- else
- {
- pi_dm_vector[0] = 0;
- }
- }
-
- i_r_size = p_vpar->picture.ppi_f_code[i_s][1]-1;
- i_motion_code = vpar_MotionCode( p_vpar );
- i_motion_residual = (i_r_size != 0 && i_motion_code != 0) ?
- GetBits( &p_vpar->bit_stream, i_r_size) : 0;
-
-
- if( (p_vpar->mb.i_mv_format == MOTION_FIELD) && (p_vpar->picture.i_structure == FRAME_STRUCTURE) )
- {
- p_vpar->slice.pppi_pmv[i_r][i_s][1] >>= 1;
- }
-
- vpar_DecodeMotionVector( &p_vpar->slice.pppi_pmv[i_r][i_s][1], i_r_size,
- i_motion_code, i_motion_residual, i_full_pel );
-
- if( (p_vpar->mb.i_mv_format == MOTION_FIELD) && (p_vpar->picture.i_structure == FRAME_STRUCTURE) )
- p_vpar->slice.pppi_pmv[i_r][i_s][1] <<= 1;
-
- p_mb->pppi_motion_vectors[i_r][i_s][1] = p_vpar->slice.pppi_pmv[i_r][i_s][1];
-
-
- if( p_vpar->mb.b_dmv )
- {
- if( GetBits(&p_vpar->bit_stream, 1) )
- {
- pi_dm_vector[1] = GetBits( &p_vpar->bit_stream, 1 ) ? -1 : 1;
- }
- else
- {
- pi_dm_vector[1] = 0;
- }
-
- /* Dual Prime Arithmetic (ISO/IEC 13818-2 section 7.6.3.6) */
-#define i_mv_x p_mb->pppi_motion_vectors[0][0][0]
- if( p_vpar->picture.i_structure == FRAME_STRUCTURE )
- {
-#define i_mv_y (p_mb->pppi_motion_vectors[0][0][1] << 1)
- if( p_vpar->picture.b_top_field_first )
- {
- /* vector for prediction of top field from bottom field */
- p_mb->ppi_dmv[0][0] = ((i_mv_x + (i_mv_x > 0)) >> 1) + pi_dm_vector[0];
- p_mb->ppi_dmv[0][1] = ((i_mv_y + (i_mv_y > 0)) >> 1) + pi_dm_vector[1] - 1;
-
- /* vector for prediction of bottom field from top field */
- p_mb->ppi_dmv[1][0] = ((3*i_mv_x + (i_mv_x > 0)) >> 1) + pi_dm_vector[0];
- p_mb->ppi_dmv[1][1] = ((3*i_mv_y + (i_mv_y > 0)) >> 1) + pi_dm_vector[1] + 1;
- }
- else
- {
- /* vector for prediction of top field from bottom field */
- p_mb->ppi_dmv[0][0] = ((3*i_mv_x + (i_mv_x > 0)) >> 1) + pi_dm_vector[0];
- p_mb->ppi_dmv[0][1] = ((3*i_mv_y + (i_mv_y > 0)) >> 1) + pi_dm_vector[1] - 1;
-
- /* vector for prediction of bottom field from top field */
- p_mb->ppi_dmv[1][0] = ((i_mv_x + (i_mv_x > 0)) >> 1) + pi_dm_vector[0];
- p_mb->ppi_dmv[1][1] = ((i_mv_y + (i_mv_y > 0)) >> 1) + pi_dm_vector[1] + 1;
- }
-#undef i_mv_y
- }
- else
- {
-#define i_mv_y p_mb->pppi_motion_vectors[0][0][1]
- /* vector for prediction from field of opposite 'parity' */
- p_mb->ppi_dmv[0][0] = ((i_mv_x + (i_mv_x > 0)) >> 1) + pi_dm_vector[0];
- p_mb->ppi_dmv[0][1] = ((i_mv_y + (i_mv_y > 0)) >> 1) + pi_dm_vector[1];
-
- /* correct for vertical field shift */
- if( p_vpar->picture.i_structure == TOP_FIELD )
- p_mb->ppi_dmv[0][1]--;
- else
- p_mb->ppi_dmv[0][1]++;
-#undef i_mv_y
- }
-#undef i_mv_x
- }
-}
-
-/*****************************************************************************
- * vpar_MPEG1MotionVector : Parse the next MPEG-1 motion vectors
- *****************************************************************************/
-void vpar_MPEG1MotionVector( vpar_thread_t * p_vpar, macroblock_t * p_mb, int i_s )
-{
- vpar_MotionVector( p_vpar, p_mb, 0, i_s, p_vpar->picture.pb_full_pel_vector[i_s] );
-}
-
-/*****************************************************************************
- * vpar_MPEG2MotionVector : Parse the next MPEG-2 motion_vectors field
- *****************************************************************************/
-void vpar_MPEG2MotionVector( vpar_thread_t * p_vpar, macroblock_t * p_mb, int i_s )
-{
- if( p_vpar->mb.i_mv_count == 1 )
- {
- if( p_vpar->mb.i_mv_format == MOTION_FIELD && !p_vpar->mb.b_dmv )
- {
- p_mb->ppi_field_select[0][i_s] = p_mb->ppi_field_select[1][i_s]
- = GetBits( &p_vpar->bit_stream, 1 );
- }
- vpar_MotionVector( p_vpar, p_mb, 0, i_s, 0 );
- p_vpar->slice.pppi_pmv[1][i_s][0] = p_vpar->slice.pppi_pmv[0][i_s][0];
- p_vpar->slice.pppi_pmv[1][i_s][1] = p_vpar->slice.pppi_pmv[0][i_s][1];
- p_mb->pppi_motion_vectors[1][i_s][0] = p_vpar->slice.pppi_pmv[0][i_s][0];
- p_mb->pppi_motion_vectors[1][i_s][1] = p_vpar->slice.pppi_pmv[0][i_s][1];
- }
- else
- {
- p_mb->ppi_field_select[0][i_s] = GetBits( &p_vpar->bit_stream, 1 );
- vpar_MotionVector( p_vpar, p_mb, 0, i_s, 0 );
- p_mb->ppi_field_select[1][i_s] = GetBits( &p_vpar->bit_stream, 1 );
- vpar_MotionVector( p_vpar, p_mb, 1, i_s, 0 );
- }
-}
-
-
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