多媒体编程

开发平台：
Visual C++

SubtitlesMicroDVD.cpp：源码内容
							/**************************************************************************************
 *                                                                                    *
 *                                                                                    *
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#include "SubtitlesMicroDVD.h"
MediaSubtitlerMicroDVD::MediaSubtitlerMicroDVD()
{
	this->inputFile   = new MediaInput();
	this->inputBuffer = new MediaBuffer();
}
MediaSubtitlerMicroDVD::~MediaSubtitlerMicroDVD()
{
	delete this->inputFile;
	delete this->inputBuffer;
}
media_type_t  MediaSubtitlerMicroDVD::GetType()
{
	return MEDIA_TYPE_SUBTITLER;
}
char         *MediaSubtitlerMicroDVD::GetName()
{
	return "MicroDVD Subtitle Reader";
}
MP_RESULT     MediaSubtitlerMicroDVD::Connect(MediaItem *item)
{
	return MP_RESULT_OK;
}
MP_RESULT     MediaSubtitlerMicroDVD::ReleaseConnections()
{
	return MP_RESULT_OK;
}
DWORD         MediaSubtitlerMicroDVD::GetCaps()
{
	return 0;
}
MP_RESULT     MediaSubtitlerMicroDVD::Configure(HINSTANCE hInstance, HWND hwnd)
{
	return MP_RESULT_ERROR;
}
MP_RESULT MediaSubtitlerMicroDVD::ParseSubtitle()
{
	char text[512];
	DWORD i, j, count;
	if( sscanf((char *) this->inputBuffer->GetData(), "{%d}{%d}", &this->firstFrame, &this->lastFrame) != 2)
		return MP_RESULT_ERROR;
	strcpy(text, strrchr((char *) this->inputBuffer->GetData(), '}') + 1);
	
	i     = 0;
	count = 0;
	for(j=0; j < strlen(text); j++) {
		if(text[j] == '|') {
			this->subtitles.subtitlesText[i][count] = '';
			i++;
			count = 0;
		}
		else {
			if(text[j] == 'n') {
				this->subtitles.subtitlesText[i][count] = '';
				break;
			}
			else {
				this->subtitles.subtitlesText[i][count] = text[j];
				count++;
			}
		}
	}
	this->subtitles.nbSubtitles = i + 1;
	return MP_RESULT_OK;
}
MP_RESULT MediaSubtitlerMicroDVD::SeekToFrame(DWORD frameNumber)
{
	if(frameNumber > this->lastFrame) {
		do {
			this->inputFile->GetLine(this->inputBuffer);
			this->previousLastFrame = this->lastFrame;
			if(sscanf((char *) this->inputBuffer->GetData(), "{%d}{%d}", &this->firstFrame, &this->lastFrame) != 2) {
				return MP_RESULT_ERROR;
			}
		
		}
		while(this->firstFrame < frameNumber);
		this->ParseSubtitle();
	}
	else {
		this->inputFile->Seek(0, INPUT_SEEK_SET);
		this->firstFrame = 0;
		this->lastFrame  = 0;
		this->previousLastFrame = 0;
		SeekToFrame(frameNumber);
	}
	return MP_RESULT_OK;
}
MP_RESULT    MediaSubtitlerMicroDVD::Open(char *lpFilename)
{
	if(lpFilename) {
		this->firstFrame         = 0;
		this->lastFrame          = 0;
		this->firstSubtitleFrame = 0;
		this->previousLastFrame  = 0;
		if(this->inputFile->Open(lpFilename, INPUT_OPEN_ASCII) == MP_RESULT_OK) {
			
			this->inputBuffer->Alloc(SUB_INPUT_BUFFER_SIZE);
			this->subtitles.subtitlesText[0] = (char *) new char[256];
			this->subtitles.subtitlesText[1] = (char *) new char[256];
			this->subtitles.subtitlesText[2] = (char *) new char[256];
			this->subtitles.subtitlesText[3] = (char *) new char[256];
			this->subtitles.nbSubtitles = 0;
			this->inputFile->GetLine(this->inputBuffer);
			if(this->ParseSubtitle() == MP_RESULT_OK) {
				this->firstSubtitleFrame = this->firstFrame;
				this->previousLastFrame  = 0;
				return MP_RESULT_OK;
			}
		}
	}
	return MP_RESULT_ERROR;
}
subtitles_t *MediaSubtitlerMicroDVD::GetSubtitles(DWORD frameNumber)
{
	if(frameNumber < this->firstSubtitleFrame) {
	
		return NULL;
	}
	if(frameNumber < this->firstFrame && frameNumber > this->previousLastFrame) {
		return NULL;
	}
	if(frameNumber >= this->firstFrame && frameNumber < this->lastFrame) {
		return &this->subtitles;
	}
	else {
	
		this->SeekToFrame(frameNumber);
		
		return NULL;
	}
	return NULL;
}
MP_RESULT    MediaSubtitlerMicroDVD::Close()
{
	if(this->inputFile) {
	
		this->inputFile->Close();
	}
	return MP_RESULT_ERROR;
}

						