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#include "directshowioreader.h"
#include "directshoweventloop.h"
#include "directshowglobal.h"
#include "directshowiosource.h"
#include <QtCore/qcoreapplication.h>
#include <QtCore/qcoreevent.h>
#include <QtCore/qiodevice.h>
#include <QtCore/qthread.h>
class DirectShowSampleRequest
{
public:
DirectShowSampleRequest(
IMediaSample *sample, DWORD_PTR userData, LONGLONG position, LONG length, BYTE *buffer)
: next(0)
, sample(sample)
, userData(userData)
, position(position)
, length(length)
, buffer(buffer)
, result(S_FALSE)
{
}
DirectShowSampleRequest *remove() { DirectShowSampleRequest *n = next; delete this; return n; }
DirectShowSampleRequest *next;
IMediaSample *sample;
DWORD_PTR userData;
LONGLONG position;
LONG length;
BYTE *buffer;
HRESULT result;
};
DirectShowIOReader::DirectShowIOReader(
QIODevice *device, DirectShowIOSource *source, DirectShowEventLoop *loop)
: m_source(source)
, m_device(device)
, m_loop(loop)
, m_pendingHead(0)
, m_pendingTail(0)
, m_readyHead(0)
, m_readyTail(0)
, m_synchronousPosition(0)
, m_synchronousLength(0)
, m_synchronousBytesRead(0)
, m_synchronousBuffer(0)
, m_synchronousResult(S_OK)
, m_totalLength(0)
, m_availableLength(0)
, m_flushing(false)
{
moveToThread(device->thread());
connect(device, SIGNAL(readyRead()), this, SLOT(readyRead()));
}
DirectShowIOReader::~DirectShowIOReader()
{
flushRequests();
}
HRESULT DirectShowIOReader::QueryInterface(REFIID riid, void **ppvObject)
{
return m_source->QueryInterface(riid, ppvObject);
}
ULONG DirectShowIOReader::AddRef()
{
return m_source->AddRef();
}
ULONG DirectShowIOReader::Release()
{
return m_source->Release();
}
// IAsyncReader
HRESULT DirectShowIOReader::RequestAllocator(
IMemAllocator *pPreferred, ALLOCATOR_PROPERTIES *pProps, IMemAllocator **ppActual)
{
if (!ppActual || !pProps) {
return E_POINTER;
} else {
ALLOCATOR_PROPERTIES actualProperties;
if (pProps->cbAlign == 0)
pProps->cbAlign = 1;
if (pPreferred && pPreferred->SetProperties(pProps, &actualProperties) == S_OK) {
pPreferred->AddRef();
*ppActual = pPreferred;
m_source->setAllocator(*ppActual);
return S_OK;
} else {
*ppActual = com_new<IMemAllocator>(CLSID_MemoryAllocator, IID_IMemAllocator);
if (*ppActual) {
if ((*ppActual)->SetProperties(pProps, &actualProperties) != S_OK) {
(*ppActual)->Release();
} else {
m_source->setAllocator(*ppActual);
return S_OK;
}
}
}
ppActual = 0;
return E_FAIL;
}
}
HRESULT DirectShowIOReader::Request(IMediaSample *pSample, DWORD_PTR dwUser)
{
QMutexLocker locker(&m_mutex);
if (!pSample) {
return E_POINTER;
} else if (m_flushing) {
return VFW_E_WRONG_STATE;
} else {
REFERENCE_TIME startTime = 0;
REFERENCE_TIME endTime = 0;
BYTE *buffer;
if (pSample->GetTime(&startTime, &endTime) != S_OK
|| pSample->GetPointer(&buffer) != S_OK) {
return VFW_E_SAMPLE_TIME_NOT_SET;
} else {
LONGLONG position = startTime / 10000000;
LONG length = (endTime - startTime) / 10000000;
DirectShowSampleRequest *request = new DirectShowSampleRequest(
pSample, dwUser, position, length, buffer);
if (m_pendingTail) {
m_pendingTail->next = request;
} else {
m_pendingHead = request;
m_loop->postEvent(this, new QEvent(QEvent::User));
}
m_pendingTail = request;
return S_OK;
}
}
}
HRESULT DirectShowIOReader::WaitForNext(
DWORD dwTimeout, IMediaSample **ppSample, DWORD_PTR *pdwUser)
{
if (!ppSample || !pdwUser)
return E_POINTER;
QMutexLocker locker(&m_mutex);
do {
if (m_readyHead) {
DirectShowSampleRequest *request = m_readyHead;
*ppSample = request->sample;
*pdwUser = request->userData;
HRESULT hr = request->result;
m_readyHead = request->next;
if (!m_readyHead)
m_readyTail = 0;
delete request;
return hr;
} else if (m_flushing) {
*ppSample = 0;
*pdwUser = 0;
return VFW_E_WRONG_STATE;
}
} while (m_wait.wait(&m_mutex, dwTimeout));
*ppSample = 0;
*pdwUser = 0;
return VFW_E_TIMEOUT;
}
HRESULT DirectShowIOReader::SyncReadAligned(IMediaSample *pSample)
{
if (!pSample) {
return E_POINTER;
} else {
REFERENCE_TIME startTime = 0;
REFERENCE_TIME endTime = 0;
BYTE *buffer;
if (pSample->GetTime(&startTime, &endTime) != S_OK
|| pSample->GetPointer(&buffer) != S_OK) {
return VFW_E_SAMPLE_TIME_NOT_SET;
} else {
LONGLONG position = startTime / 10000000;
LONG length = (endTime - startTime) / 10000000;
QMutexLocker locker(&m_mutex);
if (thread() == QThread::currentThread()) {
qint64 bytesRead = 0;
HRESULT hr = blockingRead(position, length, buffer, &bytesRead);
if (SUCCEEDED(hr))
pSample->SetActualDataLength(bytesRead);
return hr;
} else {
m_synchronousPosition = position;
m_synchronousLength = length;
m_synchronousBuffer = buffer;
m_loop->postEvent(this, new QEvent(QEvent::User));
m_wait.wait(&m_mutex);
m_synchronousBuffer = 0;
if (SUCCEEDED(m_synchronousResult))
pSample->SetActualDataLength(m_synchronousBytesRead);
return m_synchronousResult;
}
}
}
}
HRESULT DirectShowIOReader::SyncRead(LONGLONG llPosition, LONG lLength, BYTE *pBuffer)
{
if (!pBuffer) {
return E_POINTER;
} else {
if (thread() == QThread::currentThread()) {
qint64 bytesRead;
return blockingRead(llPosition, lLength, pBuffer, &bytesRead);
} else {
QMutexLocker locker(&m_mutex);
m_synchronousPosition = llPosition;
m_synchronousLength = lLength;
m_synchronousBuffer = pBuffer;
m_loop->postEvent(this, new QEvent(QEvent::User));
m_wait.wait(&m_mutex);
m_synchronousBuffer = 0;
return m_synchronousResult;
}
}
}
HRESULT DirectShowIOReader::Length(LONGLONG *pTotal, LONGLONG *pAvailable)
{
if (!pTotal || !pAvailable) {
return E_POINTER;
} else {
QMutexLocker locker(&m_mutex);
*pTotal = m_totalLength;
*pAvailable = m_availableLength;
return S_OK;
}
}
HRESULT DirectShowIOReader::BeginFlush()
{
QMutexLocker locker(&m_mutex);
if (m_flushing)
return S_FALSE;
m_flushing = true;
flushRequests();
m_wait.wakeAll();
return S_OK;
}
HRESULT DirectShowIOReader::EndFlush()
{
QMutexLocker locker(&m_mutex);
if (!m_flushing)
return S_FALSE;
m_flushing = false;
return S_OK;
}
void DirectShowIOReader::customEvent(QEvent *event)
{
if (event->type() == QEvent::User) {
readyRead();
} else {
QObject::customEvent(event);
}
}
void DirectShowIOReader::readyRead()
{
QMutexLocker locker(&m_mutex);
m_availableLength = m_device->bytesAvailable() + m_device->pos();
m_totalLength = m_device->size();
if (m_synchronousBuffer) {
if (nonBlockingRead(
m_synchronousPosition,
m_synchronousLength,
m_synchronousBuffer,
&m_synchronousBytesRead,
&m_synchronousResult)) {
m_wait.wakeAll();
}
} else {
qint64 bytesRead = 0;
while (m_pendingHead && nonBlockingRead(
m_pendingHead->position,
m_pendingHead->length,
m_pendingHead->buffer,
&bytesRead,
&m_pendingHead->result)) {
m_pendingHead->sample->SetActualDataLength(bytesRead);
if (m_readyTail)
m_readyTail->next = m_pendingHead;
m_readyTail = m_pendingHead;
m_pendingHead = m_pendingHead->next;
m_readyTail->next = 0;
if (!m_pendingHead)
m_pendingTail = 0;
if (!m_readyHead)
m_readyHead = m_readyTail;
m_wait.wakeAll();
}
}
}
HRESULT DirectShowIOReader::blockingRead(
LONGLONG position, LONG length, BYTE *buffer, qint64 *bytesRead)
{
*bytesRead = 0;
if (qint64(position) > m_device->size())
return S_FALSE;
const qint64 maxSize = qMin<qint64>(m_device->size(), position + length);
while (m_device->bytesAvailable() + m_device->pos() < maxSize) {
if (!m_device->waitForReadyRead(-1))
return S_FALSE;
}
if (m_device->pos() != position && !m_device->seek(position))
return S_FALSE;
const qint64 maxBytes = qMin<qint64>(length, m_device->bytesAvailable());
*bytesRead = m_device->read(reinterpret_cast<char *>(buffer), maxBytes);
if (*bytesRead != length) {
qMemSet(buffer + *bytesRead, 0, length - *bytesRead);
return S_FALSE;
} else {
return S_OK;
}
}
bool DirectShowIOReader::nonBlockingRead(
LONGLONG position, LONG length, BYTE *buffer, qint64 *bytesRead, HRESULT *result)
{
const qint64 maxSize = qMin<qint64>(m_device->size(), position + length);
if (position > m_device->size()) {
*bytesRead = 0;
*result = S_FALSE;
return true;
} else if (m_device->bytesAvailable() + m_device->pos() >= maxSize) {
if (m_device->pos() != position && !m_device->seek(position)) {
*bytesRead = 0;
*result = S_FALSE;
return true;
} else {
const qint64 maxBytes = qMin<qint64>(length, m_device->bytesAvailable());
*bytesRead = m_device->read(reinterpret_cast<char *>(buffer), maxBytes);
if (*bytesRead != length) {
qMemSet(buffer + *bytesRead, 0, length - *bytesRead);
*result = S_FALSE;
} else {
*result = S_OK;
}
return true;
}
} else {
return false;
}
}
void DirectShowIOReader::flushRequests()
{
while (m_pendingHead) {
m_pendingHead->result = VFW_E_WRONG_STATE;
if (m_readyTail)
m_readyTail->next = m_pendingHead;
m_readyTail = m_pendingHead;
m_pendingHead = m_pendingHead->next;
m_readyTail->next = 0;
if (!m_pendingHead)
m_pendingTail = 0;
if (!m_readyHead)
m_readyHead = m_readyTail;
}
}