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206 lines
6.8 KiB
206 lines
6.8 KiB
/*****************************************************************************
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* vpar_motion.c : motion vectors parsing
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* (c)1999 VideoLAN
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/uio.h>
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#include <X11/Xlib.h>
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#include <X11/extensions/XShm.h>
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#include "config.h"
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#include "common.h"
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#include "mtime.h"
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#include "vlc_thread.h"
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#include "intf_msg.h"
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#include "debug.h" /* ?? temporaire, requis par netlist.h */
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#include "input.h"
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#include "input_netlist.h"
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#include "decoder_fifo.h"
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#include "video.h"
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#include "video_output.h"
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#include "vdec_idct.h"
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#include "video_decoder.h"
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#include "vdec_motion.h"
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#include "vpar_blocks.h"
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#include "vpar_headers.h"
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#include "video_fifo.h"
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#include "vpar_synchro.h"
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#include "video_parser.h"
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#include "vpar_motion.h"
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/* mv_format */
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#define MV_FIELD 0
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#define MV_FRAME 1
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/*
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* Local prototypes
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*/
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/****************************************************************************
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* vpar_MotionCode : Parse the next motion code
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****************************************************************************/
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static __inline__ int vpar_MotionCode( vpar_thread_t * p_vpar )
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{
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int i_code;
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static mv_tab_t p_mv_tab0[8] =
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{ {-1,0}, {3,3}, {2,2}, {2,2}, {1,1}, {1,1}, {1,1}, {1,1} };
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/* Table B-10, motion_code, codes 0000011 ... 000011x */
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static mv_tab_t p_mv_tab1[8] =
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{ {-1,0}, {-1,0}, {-1,0}, {7,6}, {6,6}, {5,6}, {4,5}, {4,5} };
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/* Table B-10, motion_code, codes 0000001100 ... 000001011x */
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static mv_tab_t p_mv_tab2[12] = {
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{16,9}, {15,9}, {14,9}, {13,9},
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{12,9}, {11,9}, {10,8}, {10,8},
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{9,8}, {9,8}, {8,8}, {8,8} };
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if( GetBits(&p_vpar->bit_stream, 1) )
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{
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return 0;
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}
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if( (i_code = ShowBits(&p_vpar->bit_stream, 9)) >= 64 )
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{
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i_code >>= 6;
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RemoveBits( &p_vpar->bit_stream, p_mv_tab0[0].i_len );
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return( GetBits(&p_vpar->bit_stream, 1) ? -p_mv_tab0[i_code].i_val : p_mv_tab0[i_code].i_val );
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}
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if( i_code >= 24 )
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{
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i_code >>= 3;
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RemoveBits( &p_vpar->bit_stream, p_mv_tab1[0].i_len );
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return( GetBits(&p_vpar->bit_stream, 1) ? -p_mv_tab1[i_code].i_val : p_mv_tab1[i_code].i_val );
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}
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if( (i_code -= 12) < 0 )
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{
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p_vpar->picture.b_error = 1;
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intf_DbgMsg( "vpar debug: Invalid motion_vector code\n" );
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return 0;
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}
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RemoveBits( &p_vpar->bit_stream, p_mv_tab2[0].i_len );
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return( GetBits(&p_vpar->bit_stream, 1) ? -p_mv_tab2[i_code].i_val : p_mv_tab2[i_code].i_val );
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}
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/****************************************************************************
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* vpar_DecodeMotionVector : decode a motion_vector
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****************************************************************************/
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static __inline__ void vpar_DecodeMotionVector( int * pi_prediction, int i_r_size,
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int i_motion_code, int i_motion_residual, int i_full_pel )
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{
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int i_limit, i_vector;
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/* ISO/IEC 13818-1 section 7.6.3.1 */
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i_limit = 16 << i_r_size;
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i_vector = *pi_prediction >> i_full_pel;
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if( i_motion_code < 0 )
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{
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i_vector += ((i_motion_code-1) << i_r_size) + i_motion_residual + 1;
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if( i_vector >= i_limit )
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i_vector -= i_limit << 1;
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}
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else if( i_motion_code > 0 )
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{
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i_vector -= ((-i_motion_code-1) << i_r_size) + i_motion_residual + 1;
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if( i_vector < i_limit )
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i_vector += i_limit << 1;
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}
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*pi_prediction = i_vector << i_full_pel;
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}
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/****************************************************************************
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* vpar_MotionVector : Parse the next motion_vector field
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****************************************************************************/
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void vpar_MotionVector( vpar_thread_t * p_vpar, macroblock_t * p_mb, int i_r,
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int i_s, int i_full_pel )
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{
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int i_motion_code, i_motion_residual;
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int i_r_size;
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i_r_size = p_vpar->picture.ppi_f_code[i_s][0]-1;
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i_motion_code = vpar_MotionCode( p_vpar );
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i_motion_residual = (i_r_size != 0 && i_motion_code != 0) ?
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GetBits( &p_vpar->bit_stream, i_r_size) : 0;
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vpar_DecodeMotionVector( &p_vpar->slice.pppi_pmv[i_r][i_s][0], i_r_size,
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i_motion_code, i_motion_residual, i_full_pel );
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p_mb->pppi_motion_vectors[i_r][i_s][0] = p_vpar->slice.pppi_pmv[i_r][i_s][0];
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if( p_vpar->mb.b_dmv )
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{
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if( GetBits(&p_vpar->bit_stream, 1) )
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{
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p_mb->pi_dm_vector[0] = GetBits( &p_vpar->bit_stream, 1 ) ? -1 : 1;
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}
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else
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{
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p_mb->pi_dm_vector[0] = 0;
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}
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}
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i_r_size = p_vpar->picture.ppi_f_code[i_s][1]-1;
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i_motion_code = vpar_MotionCode( p_vpar );
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i_motion_residual = (i_r_size != 0 && i_motion_code != 0) ?
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GetBits( &p_vpar->bit_stream, i_r_size) : 0;
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vpar_DecodeMotionVector( &p_vpar->slice.pppi_pmv[i_r][i_s][1], i_r_size,
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i_motion_code, i_motion_residual, i_full_pel );
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p_mb->pppi_motion_vectors[i_r][i_s][1] = p_vpar->slice.pppi_pmv[i_r][i_s][1];
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if( p_vpar->mb.b_dmv )
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{
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if( GetBits(&p_vpar->bit_stream, 1) )
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{
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p_mb->pi_dm_vector[1] = GetBits( &p_vpar->bit_stream, 1 ) ? -1 : 1;
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}
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else
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{
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p_mb->pi_dm_vector[1] = 0;
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}
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}
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}
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/*****************************************************************************
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* vpar_MPEG1MotionVector : Parse the next MPEG-1 motion vectors
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*****************************************************************************/
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void vpar_MPEG1MotionVector( vpar_thread_t * p_vpar, macroblock_t * p_mb, int i_s )
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{
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vpar_MotionVector( p_vpar, p_mb, 0, i_s, p_vpar->picture.pb_full_pel_vector[i_s] );
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}
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/*****************************************************************************
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* vpar_MPEG2MotionVector : Parse the next MPEG-2 motion_vectors field
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*****************************************************************************/
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void vpar_MPEG2MotionVector( vpar_thread_t * p_vpar, macroblock_t * p_mb, int i_s )
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{
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if( p_vpar->mb.i_mv_count == 1 )
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{
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if( p_vpar->mb.i_mv_format == MV_FIELD && !p_vpar->mb.b_dmv )
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{
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p_mb->ppi_field_select[0][i_s] = p_mb->ppi_field_select[1][i_s]
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= GetBits( &p_vpar->bit_stream, 1 );
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}
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vpar_MotionVector( p_vpar, p_mb, 0, i_s, 0 );
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}
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else
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{
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p_mb->ppi_field_select[0][i_s] = GetBits( &p_vpar->bit_stream, 1 );
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vpar_MotionVector( p_vpar, p_mb, 0, i_s, 0 );
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p_mb->ppi_field_select[1][i_s] = GetBits( &p_vpar->bit_stream, 1 );
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vpar_MotionVector( p_vpar, p_mb, 1, i_s, 0 );
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}
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}
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