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/* Copyright (C) 2013 Mamadou DIOP
* Copyright (C) 2013 Doubango Telecom <http://www.doubango.org>
*
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* DOUBANGO is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with DOUBANGO.
*/
#include "plugin_audio_dsp_mediabuffer.h"
AudioDSPMediaBuffer::AudioDSPMediaBuffer(DWORD cbMaxLength, HRESULT& hr) :
m_nRefCount(1),
m_cbMaxLength(cbMaxLength),
m_cbLength(0),
m_pbData(NULL)
{
m_pbData = new BYTE[cbMaxLength];
if (!m_pbData) {
hr = E_OUTOFMEMORY;
}
}
AudioDSPMediaBuffer::~AudioDSPMediaBuffer()
{
if (m_pbData) {
delete [] m_pbData;
}
}
// Function to create a new IMediaBuffer object and return
// an AddRef'd interface pointer.
HRESULT AudioDSPMediaBuffer::Create(long cbMaxLen, IMediaBuffer **ppBuffer)
{
HRESULT hr = S_OK;
AudioDSPMediaBuffer *pBuffer = NULL;
if (ppBuffer == NULL) {
return E_POINTER;
}
pBuffer = new AudioDSPMediaBuffer(cbMaxLen, hr);
if (pBuffer == NULL) {
hr = E_OUTOFMEMORY;
}
if (SUCCEEDED(hr)) {
*ppBuffer = pBuffer;
(*ppBuffer)->AddRef();
}
if (pBuffer) {
pBuffer->Release();
}
return hr;
}
// IUnknown methods.
STDMETHODIMP AudioDSPMediaBuffer::QueryInterface(REFIID riid, void **ppv)
{
if (ppv == NULL) {
return E_POINTER;
}
else if (riid == IID_IMediaBuffer || riid == IID_IUnknown) {
*ppv = static_cast<IMediaBuffer *>(this);
AddRef();
return S_OK;
}
else {
*ppv = NULL;
return E_NOINTERFACE;
}
}
STDMETHODIMP_(ULONG) AudioDSPMediaBuffer::AddRef()
{
return InterlockedIncrement(&m_nRefCount);
}
STDMETHODIMP_(ULONG) AudioDSPMediaBuffer::Release()
{
LONG lRef = InterlockedDecrement(&m_nRefCount);
if (lRef == 0) {
delete this;
// m_cRef is no longer valid! Return lRef.
}
return lRef;
}
// IMediaBuffer methods.
STDMETHODIMP AudioDSPMediaBuffer::SetLength(DWORD cbLength)
{
if (cbLength > m_cbMaxLength) {
return E_INVALIDARG;
}
m_cbLength = cbLength;
return S_OK;
}
STDMETHODIMP AudioDSPMediaBuffer::GetMaxLength(DWORD *pcbMaxLength)
{
if (pcbMaxLength == NULL) {
return E_POINTER;
}
*pcbMaxLength = m_cbMaxLength;
return S_OK;
}
STDMETHODIMP AudioDSPMediaBuffer::GetBufferAndLength(BYTE **ppbBuffer, DWORD *pcbLength)
{
// Either parameter can be NULL, but not both.
if (ppbBuffer == NULL && pcbLength == NULL) {
return E_POINTER;
}
if (ppbBuffer) {
*ppbBuffer = m_pbData;
}
if (pcbLength) {
*pcbLength = m_cbLength;
}
return S_OK;
}
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