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403 lines
20 KiB
403 lines
20 KiB
/*****************************************************************************
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* video_decoder.c : video decoder thread
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*****************************************************************************
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* Copyright (C) 1999-2001 VideoLAN
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* $Id: video_decoder.c,v 1.6 2002/02/19 00:50:19 sam Exp $
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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* Michel Lespinasse <walken@zoy.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <stdlib.h> /* free() */
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#include <string.h> /* memcpy(), memset() */
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#include <errno.h> /* errno */
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#include <videolan/vlc.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h> /* getpid() */
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#endif
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#include "video.h"
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#include "video_output.h"
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#include "stream_control.h"
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#include "input_ext-dec.h"
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#include "vdec_ext-plugins.h"
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#include "video_decoder.h"
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#include "vpar_pool.h"
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#include "video_parser.h"
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/*
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* Local prototypes
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*/
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static void RunThread ( vdec_thread_t *p_vdec );
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/*****************************************************************************
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* vdec_CreateThread: create a video decoder thread
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*****************************************************************************
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* This function creates a new video decoder thread, and returns a pointer
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* to its description. On error, it returns NULL.
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*****************************************************************************/
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vdec_thread_t * vdec_CreateThread( vdec_pool_t * p_pool )
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{
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vdec_thread_t * p_vdec;
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/* Allocate the memory needed to store the thread's structure */
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if ( (p_vdec = (vdec_thread_t *)malloc( sizeof(vdec_thread_t) )) == NULL )
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{
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intf_ErrMsg("vdec error: not enough memory for vdec_CreateThread() to create the new thread");
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return( NULL );
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}
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/*
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* Initialize the thread properties
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*/
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p_vdec->b_die = 0;
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/*
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* Initialize the parser properties
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*/
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p_vdec->p_pool = p_pool;
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/* Spawn the video decoder thread */
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if ( vlc_thread_create(&p_vdec->thread_id, "video decoder",
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(vlc_thread_func_t)RunThread, (void *)p_vdec) )
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{
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intf_ErrMsg("vdec error: can't spawn video decoder thread");
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free( p_vdec );
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return( NULL );
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}
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return( p_vdec );
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}
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/*****************************************************************************
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* vdec_DestroyThread: destroy a video decoder thread
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*****************************************************************************/
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void vdec_DestroyThread( vdec_thread_t *p_vdec )
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{
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/* Ask thread to kill itself */
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p_vdec->b_die = 1;
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/* Make sure the decoder thread leaves the vpar_GetMacroblock() function */
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vlc_mutex_lock( &p_vdec->p_pool->lock );
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vlc_cond_broadcast( &p_vdec->p_pool->wait_undecoded );
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vlc_mutex_unlock( &p_vdec->p_pool->lock );
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/* Waiting for the decoder thread to exit */
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vlc_thread_join( p_vdec->thread_id );
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}
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/* following functions are local */
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/*****************************************************************************
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* vdec_InitThread: initialize video decoder thread
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*****************************************************************************
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* This function is called from RunThread and performs the second step of the
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* initialization.
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*****************************************************************************/
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void vdec_InitThread( vdec_thread_t * p_vdec )
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{
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#if !defined(SYS_BEOS)
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# if VDEC_NICE
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/* Re-nice ourself - otherwise we would steal CPU time from the video
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* output, which would make a poor display. */
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# if !defined(WIN32)
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if( nice(VDEC_NICE) == -1 )
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# else
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if( !SetThreadPriority( GetCurrentThread(),
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THREAD_PRIORITY_BELOW_NORMAL ) )
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# endif
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{
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intf_WarnMsg( 2, "vpar warning : couldn't nice() (%s)",
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strerror(errno) );
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}
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# endif
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#endif
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p_vdec->p_idct_data = NULL;
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p_vdec->p_pool->pf_idct_init( &p_vdec->p_idct_data );
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/* Mark thread as running and return */
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}
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/*****************************************************************************
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* vdec_EndThread: thread destruction
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*****************************************************************************
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* This function is called when the thread ends after a sucessful
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* initialization.
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*****************************************************************************/
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void vdec_EndThread( vdec_thread_t * p_vdec )
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{
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if( p_vdec->p_idct_data != NULL )
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{
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free( p_vdec->p_idct_data );
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}
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free( p_vdec );
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}
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/*****************************************************************************
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* MotionBlock: does one component of the motion compensation
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*****************************************************************************/
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static __inline__ void MotionBlock( vdec_pool_t * p_pool,
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boolean_t b_average,
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int i_x_pred, int i_y_pred,
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yuv_data_t * pp_dest[3], int i_dest_offset,
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yuv_data_t * pp_src[3], int i_src_offset,
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int i_stride, int i_height,
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boolean_t b_second_half,
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int i_chroma_format )
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{
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int i_xy_half;
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yuv_data_t * p_src1;
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yuv_data_t * p_src2;
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i_xy_half = ((i_y_pred & 1) << 1) | (i_x_pred & 1);
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p_src1 = pp_src[0] + i_src_offset
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+ (i_x_pred >> 1) + (i_y_pred >> 1) * i_stride
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+ b_second_half * (i_stride << 3);
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p_pool->ppppf_motion[b_average][0][i_xy_half]
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( pp_dest[0] + i_dest_offset + b_second_half * (i_stride << 3),
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p_src1, i_stride, i_height );
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if( i_chroma_format != CHROMA_NONE )
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{
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/* Expanded at compile-time. */
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if( i_chroma_format != CHROMA_444 )
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{
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i_x_pred /= 2;
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i_stride >>= 1;
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i_src_offset >>= 1;
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i_dest_offset >>= 1;
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}
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if( i_chroma_format == CHROMA_420 )
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{
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i_y_pred /= 2;
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i_height >>= 1;
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}
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i_xy_half = ((i_y_pred & 1) << 1) | (i_x_pred & 1);
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i_src_offset += b_second_half * (i_stride << 3);
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i_dest_offset += b_second_half * (i_stride << 3);
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p_src1 = pp_src[1] + i_src_offset
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+ (i_x_pred >> 1) + (i_y_pred >> 1) * i_stride;
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p_src2 = pp_src[2] + i_src_offset
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+ (i_x_pred >> 1) + (i_y_pred >> 1) * i_stride;
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p_pool->ppppf_motion[b_average][(i_chroma_format != CHROMA_444)]
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[i_xy_half]
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( pp_dest[1] + i_dest_offset, p_src1, i_stride, i_height );
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p_pool->ppppf_motion[b_average][(i_chroma_format != CHROMA_444)]
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[i_xy_half]
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( pp_dest[2] + i_dest_offset, p_src2, i_stride, i_height );
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}
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}
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/*****************************************************************************
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* DecodeMacroblock: decode a macroblock
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*****************************************************************************/
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#define DECODE_INTRA_BLOCK( i_b, p_dest, I_CHROMA ) \
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p_idct = &p_mb->p_idcts[i_b]; \
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p_idct->pf_idct( p_idct->pi_block, p_dest, \
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i_b < 4 ? i_lum_dct_stride : \
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I_CHROMA == CHROMA_420 ? \
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p_vpar->picture.i_field_width >> 1 : \
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i_chrom_dct_stride, \
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p_vdec->p_idct_data, p_idct->i_sparse_pos );
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#define DECODE_NONINTRA_BLOCK( i_b, p_dest, I_CHROMA ) \
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if( p_mb->i_coded_block_pattern & (1 << (11 - (i_b))) ) \
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{ \
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DECODE_INTRA_BLOCK( i_b, p_dest, I_CHROMA ); \
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}
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#define DECLARE_DECODEMB( PSZ_NAME, I_CHROMA ) \
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void PSZ_NAME ( vdec_thread_t *p_vdec, macroblock_t * p_mb ) \
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{ \
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int i, i_lum_dct_offset, i_lum_dct_stride; \
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/* This is to keep the compiler happy with CHROMA_420 and CHROMA_NONE */\
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int i_chrom_dct_offset __attribute__((unused)); \
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int i_chrom_dct_stride __attribute__((unused)); \
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idct_inner_t * p_idct; \
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vdec_pool_t * p_pool = p_vdec->p_pool; \
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vpar_thread_t * p_vpar = p_pool->p_vpar; \
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\
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if( p_mb->i_mb_modes & DCT_TYPE_INTERLACED ) \
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{ \
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i_lum_dct_offset = p_vpar->picture.i_field_width; \
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i_lum_dct_stride = p_vpar->picture.i_field_width * 2; \
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if( I_CHROMA == CHROMA_422 ) \
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{ \
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i_chrom_dct_offset = p_vpar->picture.i_field_width >> 1; \
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i_chrom_dct_stride = p_vpar->picture.i_field_width; \
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} \
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else if( I_CHROMA == CHROMA_444 ) \
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{ \
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i_chrom_dct_offset = p_vpar->picture.i_field_width; \
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i_chrom_dct_stride = p_vpar->picture.i_field_width * 2; \
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} \
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} \
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else \
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{ \
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i_lum_dct_offset = p_vpar->picture.i_field_width * 8; \
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i_lum_dct_stride = p_vpar->picture.i_field_width; \
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if( I_CHROMA == CHROMA_422 ) \
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{ \
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i_chrom_dct_offset = p_vpar->picture.i_field_width * 4; \
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i_chrom_dct_stride = p_vpar->picture.i_field_width >> 1; \
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} \
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else if( I_CHROMA == CHROMA_444 ) \
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{ \
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i_chrom_dct_offset = p_vpar->picture.i_field_width * 8; \
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i_chrom_dct_stride = p_vpar->picture.i_field_width; \
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} \
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} \
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\
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if( !(p_mb->i_mb_modes & MB_INTRA) ) \
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{ \
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/* \
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* Motion Compensation (ISO/IEC 13818-2 section 7.6) \
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*/ \
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for( i = 0; i < p_mb->i_nb_motions; i++ ) \
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{ \
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motion_inner_t * p_motion = &p_mb->p_motions[i]; \
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MotionBlock( p_pool, p_motion->b_average, \
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p_motion->i_x_pred, p_motion->i_y_pred, \
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p_mb->pp_dest, p_motion->i_dest_offset, \
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p_motion->pp_source, p_motion->i_src_offset, \
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p_motion->i_stride, p_motion->i_height, \
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p_motion->b_second_half, I_CHROMA ); \
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} \
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\
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/* \
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* Inverse DCT (ISO/IEC 13818-2 section Annex A) and \
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* adding prediction and coefficient data (ISO/IEC \
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* 13818-2 section 7.6.8) \
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*/ \
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DECODE_NONINTRA_BLOCK( 0, p_mb->p_y_data, I_CHROMA ); \
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DECODE_NONINTRA_BLOCK( 1, p_mb->p_y_data + 8, I_CHROMA ); \
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DECODE_NONINTRA_BLOCK( 2, p_mb->p_y_data + i_lum_dct_offset, \
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I_CHROMA ); \
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DECODE_NONINTRA_BLOCK( 3, p_mb->p_y_data + i_lum_dct_offset + 8, \
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I_CHROMA ); \
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if( I_CHROMA != CHROMA_NONE ) \
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{ \
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DECODE_NONINTRA_BLOCK( 4, p_mb->p_u_data, I_CHROMA ); \
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DECODE_NONINTRA_BLOCK( 5, p_mb->p_v_data, I_CHROMA ); \
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if( I_CHROMA != CHROMA_420 ) \
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{ \
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DECODE_NONINTRA_BLOCK( 6, p_mb->p_u_data \
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+ i_chrom_dct_offset, I_CHROMA );\
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DECODE_NONINTRA_BLOCK( 7, p_mb->p_v_data \
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+ i_chrom_dct_offset, I_CHROMA );\
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if( I_CHROMA == CHROMA_444 ) \
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{ \
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DECODE_NONINTRA_BLOCK( 8, p_mb->p_u_data + 8, \
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I_CHROMA ); \
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DECODE_NONINTRA_BLOCK( 9, p_mb->p_v_data + 8, \
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I_CHROMA ); \
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DECODE_NONINTRA_BLOCK( 10, p_mb->p_u_data + 8 \
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+ i_chrom_dct_offset, I_CHROMA );\
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DECODE_NONINTRA_BLOCK( 11, p_mb->p_v_data + 8 \
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+ i_chrom_dct_offset, I_CHROMA );\
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} \
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} \
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} \
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} \
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else \
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{ \
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/* Intra macroblock */ \
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DECODE_INTRA_BLOCK( 0, p_mb->p_y_data, I_CHROMA ); \
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DECODE_INTRA_BLOCK( 1, p_mb->p_y_data + 8, I_CHROMA ); \
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DECODE_INTRA_BLOCK( 2, p_mb->p_y_data + i_lum_dct_offset, \
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I_CHROMA ); \
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DECODE_INTRA_BLOCK( 3, p_mb->p_y_data + i_lum_dct_offset + 8, \
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I_CHROMA ); \
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if( I_CHROMA != CHROMA_NONE ) \
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{ \
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DECODE_INTRA_BLOCK( 4, p_mb->p_u_data, I_CHROMA ); \
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DECODE_INTRA_BLOCK( 5, p_mb->p_v_data, I_CHROMA ); \
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if( I_CHROMA != CHROMA_420 ) \
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{ \
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DECODE_INTRA_BLOCK( 6, p_mb->p_u_data \
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+ i_chrom_dct_offset, I_CHROMA ); \
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DECODE_INTRA_BLOCK( 7, p_mb->p_v_data \
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+ i_chrom_dct_offset, I_CHROMA ); \
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if( I_CHROMA == CHROMA_444 ) \
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{ \
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DECODE_INTRA_BLOCK( 8, p_mb->p_u_data + 8, I_CHROMA ); \
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DECODE_INTRA_BLOCK( 9, p_mb->p_v_data + 8, I_CHROMA ); \
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DECODE_INTRA_BLOCK( 10, p_mb->p_u_data + 8 \
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+ i_chrom_dct_offset, I_CHROMA );\
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DECODE_INTRA_BLOCK( 11, p_mb->p_v_data + 8 \
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+ i_chrom_dct_offset, I_CHROMA );\
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} \
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} \
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} \
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} \
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}
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DECLARE_DECODEMB( vdec_DecodeMacroblockBW, CHROMA_NONE );
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DECLARE_DECODEMB( vdec_DecodeMacroblock420, CHROMA_420 );
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DECLARE_DECODEMB( vdec_DecodeMacroblock422, CHROMA_422 );
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DECLARE_DECODEMB( vdec_DecodeMacroblock444, CHROMA_444 );
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#undef DECLARE_DECODEMB
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/*****************************************************************************
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* RunThread: video decoder thread
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*****************************************************************************
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* Video decoder thread. This function does only return when the thread is
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* terminated.
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*****************************************************************************/
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static void RunThread( vdec_thread_t *p_vdec )
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{
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vdec_InitThread( p_vdec );
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/*
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* Main loop
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*/
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while( !p_vdec->b_die )
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{
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macroblock_t * p_mb;
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if( (p_mb = vpar_GetMacroblock( p_vdec->p_pool, &p_vdec->b_die )) != NULL )
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{
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p_vdec->p_pool->pf_vdec_decode( p_vdec, p_mb );
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/* Decoding is finished, release the macroblock and free
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* unneeded memory. */
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p_vdec->p_pool->pf_free_mb( p_vdec->p_pool, p_mb );
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}
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}
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/* End of thread */
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vdec_EndThread( p_vdec );
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}
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