vdecopcl.c

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: vdecopcl.c,v 1.1.1.1.42.1 2004/07/09 01:56:22 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
 * 
 * The contents of this file, and the files included with this file,
 * are subject to the current version of the RealNetworks Public
 * Source License (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
 * http://www.helixcommunity.org/content/rcsl, in which case the RCSL
 * will apply. You may also obtain the license terms directly from
 * RealNetworks.  You may not use this file except in compliance with
 * the RPSL or, if you have a valid RCSL with RealNetworks applicable
 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
 * the rights, obligations and limitations governing use of the
 * contents of the file.
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
 * instead of those above. If you wish to allow use of your version of
 * this file only under the terms of the GPL, and not to allow others
 * to use your version of this file under the terms of either the RPSL
 * or RCSL, indicate your decision by deleting the provisions above
 * and replace them with the notice and other provisions required by
 * the GPL. If you do not delete the provisions above, a recipient may
 * use your version of this file under the terms of any one of the
 * RPSL, the RCSL or the GPL.
 * 
 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
 * portions it created.
 * 
 * This file, and the files included with this file, is distributed
 * and made available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY
 * KIND, EITHER EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS
 * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET
 * ENJOYMENT OR NON-INFRINGEMENT.
 * 
 * Technology Compatibility Kit Test Suite(s) Location:
 *    http://www.helixcommunity.org/content/tck
 * 
 * Contributor(s):
 * 
 * ***** END LICENSE BLOCK ***** */

/*  Header File Includes        */
//#include <stdio.h>
//#include <stddef.h>
#include "machine.h"
#ifdef FOR_MAC
#include <stdlib.h>
#else
#include <malloc.h>
#endif
#include <string.h>         // _fmemset

#include "dllindex.h"
#include "h261func.h"
#include "h261defs.h"
#include "hvscodes.h"

/*  Defines, Typedefs, & Enums  */

//#define DEBUG_VVOPCL(a)   a
#define DEBUG_VVOPCL(a)

/*  Globals                     */
#ifdef COMPILE_MMX
#include "mmxcpuid.h"
#endif

H261Decoder     *DecoderRegistry[MAX_NUM_DECODERS] = { 0, 0 };
U32             GAliasDec[MAX_NUM_DECODERS] = { 0, 0 };

/*  File-wide Statics           */
static int      DecCount = 0;       // Number of decoders open.

static short    makeDecoder( short formatCap );
static void     *vvMalloc( size_t size );
static void		vvFree(void *ptr);

/*
 * Function:    GrayFill()
 * Purpose:     Set unused image areas to constant value.
 */
static void
GrayFill( PICTURE *pic, long lumaSize, long chrSize )
{
    U8  *y = pic->y.ptr;
    U8  *cb = pic->y.ptr + lumaSize;

    _fmemset ( y, 128, lumaSize );
    _fmemset ( cb, 128, chrSize );
}

/*-----------------------------------------------------------------------------
 *  Function:   VvOpenDecoder
 *
 *  DESCRIPTION
 *      Opens a decoder instance. Returns the decoder registry number
 *      or an error code.
 *
 *  NOTES:
 *      1. Encoder tables are static storage.
 *
 *  Author:     Mary Deshon     6/28/93
 *  Inspected:  <<not inspected yet>>
 *  Revised:
 -----------------------------------------------------------------------------*/
extern U32 VvOpenDecoder( S16 formatCap )    
{
    H261Decoder   *dec; 
    short         i, index;
#ifdef COMPILE_MMX
	//for mmx support
	cpuid_init();
#endif

    // If this is the first open call, set up read-only tables
    // and initialize decoder registry 
    if (DecCount == 0 ) {
        InitFindSC();
        InitDecodeTable(); 
    
        for (i = 0; i < MAX_NUM_DECODERS; i++)
            DecoderRegistry[i] = NULL;
    }                 

    // Init Recon tables
    InitReconTables ();
    //InitYUVToRGB ();

  
    // Do not exceed maximum number of decoders allowed
    if ( DecCount == MAX_NUM_DECODERS ) return( MAX_DECODERS_OPEN );
  
    // Try to make a decoder.
    // If successful, then return_value is an DecoderRegistry entry 
    //                  which is <= MAX_NUM_DECODERS
    // otherwise, return_value is > MAX_NUM_DECODERS and indicates
    //  an error code (see dllindex.h for codes)
    
    index = makeDecoder( formatCap );
  
    dec = DecoderRegistry[index-1];   // Do this so that I can look at struct with the Wild & Wacky 
                                    // Watcom Debugger
    return ( (U32) index );
}


/*-----------------------------------------------------------------------------
 *  Function:   VvGetDecoderPtr
 *
 *  DESCRIPTION
 *      Returns a bitStream pointer.
 *
 *  NOTES:
 *      1. Encoder tables are static storage.
 *
 *  Author:     Mary Deshon     9/22/94
 *  Inspected:  <<not inspected yet>>
 *  Revised:
 -----------------------------------------------------------------------------*/
extern U32 VvGetDecoderPtr( S16 index )    
{
    if ( DecoderRegistry[index-1] ) {
        GAliasDec[index-1] =  (U32) DecoderRegistry[index-1]->bsAbs.byteptr;
        return ( (U32) GAliasDec[index-1] );
    }
    else return (U32)NULL;
}

/*-----------------------------------------------------------------------------
 *  Function:   VvCloseDecoder
 *
 *  DESCRIPTION
 *      Closes a decoder instance.
 *
 *  Author:     Mary Deshon     7/04/93
 *  Inspected:  <<not inspected yet>>
 *  Revised:
 -----------------------------------------------------------------------------*/
extern U32  VvCloseDecoder( short hDecf )    
{
  H261Decoder   *dec;
  short         hDec = hDecf - 1;

  dec  = DecoderRegistry[hDec];

  // Free memory associated with decoder
  if (DecCount > 0 ) {
//#define VVPROFILER
#ifdef VVPROFILER	
	extern  void GetLogShutDownAllAccuTimes(void);
	GetLogShutDownAllAccuTimes();
#endif
	FreeVarStructsDecoder( dec );
	vvFree ( DecoderRegistry[hDec]->bsAbs.byteptr );
	
	GAliasDec[hDec] = 0;

	vvFree ( DecoderRegistry[hDec] );
	DecoderRegistry[hDec] = NULL;
	DecCount--;
	return ( NO_ERROR );
  }  else return ( NO_DECODERS_OPEN );
}

/*-----------------------------------------------------------------------------
 *  Function:   AllocVarStructsDecoder
 *
 *  DESCRIPTION
 *      Malloc variable size structures for a decoder instance
 *      Returns zero if no errors occurred; otherwise, error code is returned
 *
 *  Author:     Staffan Ericsson    1/13/97
 *  Inspected:  <<not inspected yet>>
 *  Revised:
 -----------------------------------------------------------------------------*/

#define MBNUM_QCIF  (9*11)
#define MBNUM_CIF   (4 * MBNUM_QCIF)
#define BITS_PER_SYMBOL (3)
#define MAXSYM_QCIF (65536 / BITS_PER_SYMBOL)
#define MAXSYM_CIF  (4 * MAXSYM_QCIF)

extern int AllocVarStructsDecoder( H261Decoder *dec, short formatCap_or_numMBs )
{
  long          imgSize, lumaSize, chromaLineLength, chromaRows, maxsym, memSize;
  short         numGOBs, numMBs, retval, formatCap;
  
  // Get image parms needed for memory allocations: imgSize, lumaSize, and numMBs
  if (formatCap_or_numMBs > MBNUM_QCIF) {   // Indicates non-standard image size
    numMBs = formatCap_or_numMBs;
    lumaSize = 256 * numMBs;
    imgSize  = 384 * numMBs;
  } else {
    formatCap = formatCap_or_numMBs;
    retval = getImgParms( formatCap, &numGOBs, &numMBs, &imgSize,
                        &lumaSize, &chromaLineLength, & chromaRows, &maxsym);
    if ( retval ) return ( (int)retval );
  }
  // Determine maxsym and formatCap
  if (numMBs <= MBNUM_QCIF) {
    maxsym = MAXSYM_QCIF;
  } else {
    maxsym = MAXSYM_CIF;
  }
  if (numMBs < MBNUM_CIF) {
    dec->formatCap = QCIF;
  } else {
    dec->formatCap = CIF;
  }
    // Allocate memory for frame store
  if ( ( dec->newOut.y.ptr = vvMalloc( imgSize ) ) == NULL )
    return( FAILED_MALLOC );
  if ( ( dec->B_Out.y.ptr  = vvMalloc( imgSize ) ) == NULL )
    return( FAILED_MALLOC );
  if ( ( dec->oldOut.y.ptr = vvMalloc( imgSize ) ) == NULL )
    return( FAILED_MALLOC );
  if ( ( dec->prevOldOut.y.ptr = vvMalloc( imgSize ) ) == NULL )
    return( FAILED_MALLOC );
    
  //GrayFill ( &dec->newOut, lumaSize, imgSize-lumaSize );
  GrayFill ( &dec->oldOut, lumaSize, imgSize-lumaSize );           
    
  // Allocate work arrays
  dec->maxMbnum = numMBs;
  memSize = numMBs * sizeof(MACROBLOCK_DESCR);
  if ( ( dec->mb = vvMalloc( memSize ) ) == NULL )
    return( FAILED_MALLOC );
  //dec->maxSym = lumaSize;    // Probably bigger than necessary
  //memSize = lumaSize * sizeof(SYMBOL);
  dec->maxSym = maxsym;
  memSize = maxsym * sizeof(SYMBOL);
  if ( ( dec->sym = vvMalloc( memSize ) ) == NULL )
    return( FAILED_MALLOC );

  // NULL out the upsampling workspace array - we mightn't need it at all
  _fmemset(&dec->convertPic, 0, sizeof(PICTURE));

  dec->pendingFrame = 0; // No pending frame to be displayed
  return 0;     // Errorcode = 0
}


/*-----------------------------------------------------------------------------
 *  Function:   FreeVarStructsDecoder
 *
 *  DESCRIPTION
 *      Free variable size structures for a decoder instance.
 *
 *  Author:     Staffan Ericsson    1/13/97
 *  Inspected:  <<not inspected yet>>
 *  Revised:
 -----------------------------------------------------------------------------*/
extern void FreeVarStructsDecoder( H261Decoder *dec )
{
    vvFree ( dec->oldOut.y.ptr );
    dec->oldOut.y.ptr = NULL;
    vvFree ( dec->newOut.y.ptr );
    dec->newOut.y.ptr = NULL;
    vvFree ( dec->B_Out.y.ptr );
    dec->B_Out.y.ptr = NULL;
    vvFree ( dec->prevOldOut.y.ptr );
    dec->prevOldOut.y.ptr = NULL;
    vvFree ( dec->mb );
    dec->mb = NULL;
    dec->maxMbnum = 0;
    vvFree ( dec->sym );
    dec->sym = NULL;
    dec->maxSym = 0;

    if( dec->convertPic.y.ptr ) {
        free( dec->convertPic.y.ptr );
        dec->convertPic.y.ptr = NULL;
        dec->convertPic.cb.ptr = NULL;
        dec->convertPic.cr.ptr = NULL;
    }
}

/*-----------------------------------------------------------------------------
 *  Function:   makeDecoder
 *
 *  DESCRIPTION
 *      Make a decoder instance
 *
 *  Author:     Mary Deshon     7/01/93
 *  Inspected:  <<not inspected yet>>
 *  Revised:
 *  11/15/93    J Bruder    Commented out unnecessary stuff.
 -----------------------------------------------------------------------------*/
static short makeDecoder( short formatCap)
{
  H261Decoder   *dec;
  int           i, retval;
  
    // Find an open slot in the DecoderRegistry, we know that there 
    // is at least one available              
  for (i = 0; DecoderRegistry[i]; i++) {};

    // Allocate memory for decoder structure
  if ( ( DecoderRegistry[i] = vvMalloc( sizeof ( H261Decoder ) ) ) == NULL )
    return( FAILED_MALLOC );
 
  dec = DecoderRegistry[i];                 // For looking at with the W2D
  
    // Allocate memory for frame store and work arrays
  retval = AllocVarStructsDecoder( dec, formatCap );
  if (retval) return (short)retval;

    // Allocate memory for bitstream
  if ( ( DecoderRegistry[i]->bsAbs.byteptr = vvMalloc( MAX_BITSTR_SIZE ) ) == NULL )
    return( FAILED_MALLOC );
  DecoderRegistry[i]->bsAbs.bitptr = 0;
  
  DecCount++;
  return ( ++i );   // Decoders are numbered 1,2,...
}


/*-----------------------------------------------------------------------------
 *  Function:   VvMalloc
 *
 *  DESCRIPTION
 *      Wrapper for malloc.
 *
 *  ASSUMPTIONS
 *      1. Malloc returns quad-aligned pointers for all compilers.
 *
 *	CAUTION:
 *		There's a serious bug here! If a given implementation does not return
 *		longword-aligned data, then this function will return a long-aligned
 *		pointer but free won't free it because it won't be a recognized
 *		pointer. This will lead to a memory leak or a crash. I haven't fixed
 *		it because I'm not aware of any systems that don't return long-aligned
 *		data, so the problem won't occur. tkent, 8/20/96
 *
 *  Author:     Mary Deshon     7/01/93
 *  Inspected:  <<not inspected yet>>
 *  Revised:
 *  02/15/94    M Deshon    Force quad-alignment.
 -----------------------------------------------------------------------------*/
static void *vvMalloc( size_t size )
{
    char    *ptr;
    U32     addr;

#ifdef FOR_MAC
    ptr = NewPtrClear(size+4);
#else
    ptr = (char *)calloc( size + 4, 1 ); /* calloc should zero memory */
#endif
    addr = (U32)ptr & 0x3L;
    
//   	assert(addr == 0);	// To trap the problem described above
   	
    /* Assume returned address can have low-order bits 00, 01, 10, or 11. */
    if ( addr == 1 ) ptr += 3;
    else if (addr == 2 ) ptr += 2;
    else if ( addr == 3 ) ptr += 1;
    else {}

    return ( (void *) ptr );
//  return ( (void *)calloc( size, 1 ) );
}

void vvFree(void *ptr)
{
#ifdef FOR_MAC
	DisposePtr(ptr);
#else
	free(ptr);
#endif
}