Method Read

LuaSTGPlus/ResourceMgr.cpp:339–391

/////////////////////////////////////////////////////////////////////////// ResMusic ///////////////////////////////////////////////////////////////////////////

/// ResMusic
////////////////////////////////////////////////////////////////////////////////
fResult ResMusic::BGMWrapper::Read(fData pBuffer, fuInt SizeToRead, fuInt* pSizeRead)
{
	fResult tFR;

	// ��õ���������С
	fuInt tBlockAlign = GetBlockAlign();

	// ������Ҫ��ȡ�IJ�������
	fuInt tSampleToRead = SizeToRead / tBlockAlign;

	// �����Ƶ����
	while (tSampleToRead)
	{
		// ��õ�ǰ������λ��(����)
		fuInt tCurSample = (fuInt)GetPosition() / tBlockAlign;

		// ����ȡλ���Ƿ񳬳�ѭ����
		if (tCurSample + tSampleToRead > m_pLoopEndSample)
		{
			// �����������
			if (tCurSample < m_pLoopEndSample)
			{
				fuInt tVaildSample = m_pLoopEndSample - tCurSample;
				fuInt tVaildSize = tVaildSample * tBlockAlign;

				if (FAILED(tFR = m_pDecoder->Read(pBuffer, tVaildSize, pSizeRead)))
					return tFR;

				// ָ�����
				pBuffer += tVaildSize;

				// ���ٲ���
				tSampleToRead -= tVaildSample;
			}

			// ����ѭ��ͷ
			SetPosition(FCYSEEKORIGIN_BEG, m_pLoopStartSample * tBlockAlign);
		}
		else
		{
			// ֱ���������
			if (FAILED(tFR = m_pDecoder->Read(pBuffer, tSampleToRead * tBlockAlign, pSizeRead)))
				return tFR;

			break;
		}
	}

	if (pSizeRead)
		*pSizeRead = SizeToRead;

	return FCYERR_OK;
}

ResMusic::BGMWrapper::BGMWrapper(fcyRefPointer<f2dSoundDecoder> pOrg, fDouble LoopStart, fDouble LoopEnd)
	: m_pDecoder(pOrg)