wvtdecode.cpp

WinCE下的MP4解码源程序.WinCE5.0开发环境下编译通过.

/*************************************************************************

This software module was originally developed by 

	Ming-Chieh Lee ([e-mail]), Microsoft Corporation
	Wei-ge Chen ([e-mail]), Microsoft Corporation
	Bruce Lin ([e-mail]), Microsoft Corporation
	Chuang Gu ([e-mail]), Microsoft Corporation
	Simon Winder ([e-mail]), Microsoft Corporation

in the course of development of the MPEG-4 Video (ISO/IEC 14496-2). 
This software module is an implementation of a part of one or more MPEG-4 Video tools 
as specified by the MPEG-4 Video. 
ISO/IEC gives users of the MPEG-4 Video free license to this software module or modifications 
thereof for use in hardware or software products claiming conformance to the MPEG-4 Video. 
Those intending to use this software module in hardware or software products are advised that its use may infringe existing patents. 
The original developer of this software module and his/her company, 
the subsequent editors and their companies, 
and ISO/IEC have no liability for use of this software module or modifications thereof in an implementation. 
Copyright is not released for non MPEG-4 Video conforming products. 
Microsoft retains full right to use the code for his/her own purpose, 
assign or donate the code to a third party and to inhibit third parties from using the code for non <MPEG standard> conforming products. 
This copyright notice must be included in all copies or derivative works. 

Copyright (c) 1996, 1997.


Module Name:
	
	wvtdecode.cpp

Abstract:

	stand-alone wavelet decoder

Revision History:

*************************************************************************/


#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <fstream.h>
#include "typeapi.h"
#include "wavelet.h"


#ifdef __MFC_
#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

#define new DEBUG_NEW				   
#endif // __MFC_

void error(char *pchMessage)
{
	fprintf(stderr,"Error: %s\n",pchMessage);
	exit(1);
}

Bool get_start_code(CInBitStream &bs)
{
	Int i=0;
	
	// byte align
	bs.flush();

	while(bs.peekBits(NUMBITS_TOL_START_CODE)!=TOL_START_CODE)
	{
		/*if((i%100)==0)
			printf("%d");
		i++;*/

		bs.getBits(8);
		if(bs.eof())
			return FALSE;
	}
	bs.getBits(NUMBITS_TOL_START_CODE);
	return TRUE;
}

// arguments  bitfile outfile spatial_layer snr_layer
int main(int argc,char **argv)
{
	Int iSpatialLayer = 0;
	Int iSNRLayer = 0;
	FILE *pfsOut;

	if(argc<3 || argc>5)
	{
		fprintf(stderr,"Bad parameters\n");
		fprintf(stderr,"%s bitfile outfile spatial_layer_select snr_layer_select\n",
			argv[0]);
		exit(1);
	}
	if(argc>=4)
		iSpatialLayer = atoi(argv[3]);
	if(argc==5)
		iSNRLayer = atoi(argv[4]);

	// create input bitstream
	ifstream bitfile(argv[1],ios::in|ios::nocreate|ios::binary);
	if(bitfile.is_open()==0)
		error("Can't open bitstream file for input");

	CInBitStream bs(bitfile);

	if((pfsOut = fopen(argv[2],"wb"))==NULL)
		error("Can't open yuv file for output");

	Int iPrevWidth = 0,iPrevHeight = 0,iPrevDecompLevels = 0;
	CWvtTextureCoder *pWvtTextureCoder = NULL;
	Int iFrame = 0;

	do {
		// find start code
		if(get_start_code(bs)==FALSE)
			break;

		// read size and decomp levels
		Int iObjectID = bs.getBits(NUMBITS_TOL_ID);
		Int iShape = bs.getBits(NUMBITS_TOL_SHAPE);
		if(iShape!=0)
			error("Unknown shape mode in stream");
		Int iWidth = bs.getBits(NUMBITS_TOL_SIZE);
		Int iHeight = bs.getBits(NUMBITS_TOL_SIZE);
		Int iDecompLevels = bs.getBits(NUMBITS_TOL_DECOMP);
		if(iSpatialLayer>=iDecompLevels)
			iSpatialLayer=iDecompLevels-1;

		// create decoder object anew if needed
		if(pWvtTextureCoder==NULL || iWidth!=iPrevWidth ||
			iHeight!=iPrevHeight || iDecompLevels!=iPrevDecompLevels)
		{
			if(pWvtTextureCoder!=NULL)
				delete pWvtTextureCoder;
			CRct rct(0,0,iWidth,iHeight);
			pWvtTextureCoder = new CWvtTextureCoder(rct,iDecompLevels,
				DAUBE_9_3);
			iPrevDecompLevels = iDecompLevels;
			iPrevWidth = iWidth;
			iPrevHeight = iHeight;
		}
#if(DEBUG_DECODE)	
		printf("\nFrame number = %d\n",iFrame);
#endif

#if(DEBUG_BITS)
		printf("\nObject ID\t\t= %d\n",iObjectID);
		printf("Shape mode\t\t= %d\n",iShape);
		printf("Width x Height\t\t= (%d x %d)\n",iWidth,iHeight);
		printf("Decomp levels\t\t= %d\n",iDecompLevels);
#endif
		// decode stream
		CVideoObjectPlane *pvop =
			pWvtTextureCoder->decode(bs,iSpatialLayer,iSNRLayer);
		
		if(pvop!=NULL)
		{
			// save vop
			pvop->dump(pfsOut,FOUR_TWO_ZERO);
			delete pvop;
		}

		iFrame++;
	} while(!bs.eof());


	if(pWvtTextureCoder!=NULL)
		delete pWvtTextureCoder;
	fclose(pfsOut);
	bitfile.close();

	return 0;
}