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SoapySDR support: input: start/stop handling
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f4exb
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@ -269,8 +269,8 @@ bool BladeRF2Input::start()
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// channel range allocated in the thread or past it. To perform the transition it stops the thread, deletes it and creates a new one.
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// channel range allocated in the thread or past it. To perform the transition it stops the thread, deletes it and creates a new one.
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// It marks the thread as needing start.
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// It marks the thread as needing start.
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//
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//
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// If the requested channel is within the thread channel range (this thread being already allocated) it simply removes its FIFO reference
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// If the requested channel is within the thread channel range (this thread being already allocated) it simply adds its FIFO reference
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// so that the samples are not fed to the FIFO anymore and leaves the thread unchanged (no stop, no delete/new)
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// so that the samples are fed to the FIFO and leaves the thread unchanged (no stop, no delete/new)
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//
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//
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// If there is no thread allocated it creates a new one with a number of channels that fits the requested channel. That is
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// If there is no thread allocated it creates a new one with a number of channels that fits the requested channel. That is
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// 1 if channel 0 is requested (SI mode) and 2 if channel 1 is requested (MI mode). It marks the thread as needing start.
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// 1 if channel 0 is requested (SI mode) and 2 if channel 1 is requested (MI mode). It marks the thread as needing start.
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@ -321,7 +321,7 @@ bool BladeRF2Input::start()
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bladerf2InputThread->setFcPos(i, fcPoss[i]);
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bladerf2InputThread->setFcPos(i, fcPoss[i]);
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}
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}
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// remove old thread address from buddies (reset in all buddies)
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// remove old thread address from buddies (reset in all buddies). The address being held only in the owning source.
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const std::vector<DeviceSourceAPI*>& sourceBuddies = m_deviceAPI->getSourceBuddies();
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const std::vector<DeviceSourceAPI*>& sourceBuddies = m_deviceAPI->getSourceBuddies();
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std::vector<DeviceSourceAPI*>::const_iterator it = sourceBuddies.begin();
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std::vector<DeviceSourceAPI*>::const_iterator it = sourceBuddies.begin();
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@ -457,7 +457,7 @@ void BladeRF2Input::stop()
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qDebug("BladeRF2Input::stop: do not re-create thread as there are no more FIFOs active");
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qDebug("BladeRF2Input::stop: do not re-create thread as there are no more FIFOs active");
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}
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}
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// remove old thread address from buddies (reset in all buddies)
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// remove old thread address from buddies (reset in all buddies). The address being held only in the owning source.
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const std::vector<DeviceSourceAPI*>& sourceBuddies = m_deviceAPI->getSourceBuddies();
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const std::vector<DeviceSourceAPI*>& sourceBuddies = m_deviceAPI->getSourceBuddies();
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std::vector<DeviceSourceAPI*>::const_iterator it = sourceBuddies.begin();
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std::vector<DeviceSourceAPI*>::const_iterator it = sourceBuddies.begin();
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@ -258,11 +258,233 @@ void SoapySDRInput::moveThreadToBuddy()
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bool SoapySDRInput::start()
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bool SoapySDRInput::start()
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{
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{
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// There is a single thread per physical device (Rx side). This thread is unique and referenced by a unique
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// buddy in the group of source buddies associated with this physical device.
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//
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// This start method is responsible for managing the thread and number of channels when the streaming of a Rx channel is started
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//
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// It checks the following conditions
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// - the thread is allocated or not (by itself or one of its buddies). If it is it grabs the thread pointer.
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// - the requested channel is the first (0) or the following
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//
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// There are two possible working modes:
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// - Single Input (SI) with only one channel streaming. This HAS to be channel 0.
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// - Multiple Input (MI) with two or more channels. It MUST be in this configuration if any channel other than 0
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// is used irrespective of what you actually do with samples coming from ignored channels.
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// For example When we will run with only channel 2 streaming from the client perspective the channels 0 amnd 1 will actually
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// be enabled and streaming but its samples will just be disregarded.
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// This means that all channels up to the highest in index being used are activated.
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//
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// It manages the transition form SI where only one channel (the first or channel 0) should be running to the
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// Multiple Input (MI) if the requested channel is 1 or more. More generally it checks if the requested channel is within the current
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// channel range allocated in the thread or past it. To perform the transition it stops the thread, deletes it and creates a new one.
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// It marks the thread as needing start.
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//
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// If the requested channel is within the thread channel range (this thread being already allocated) it simply adds its FIFO reference
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// so that the samples are fed to the FIFO and leaves the thread unchanged (no stop, no delete/new)
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//
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// If there is no thread allocated it creates a new one with a number of channels that fits the requested channel. That is
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// 1 if channel 0 is requested (SI mode) and 3 if channel 2 is requested (MI mode). It marks the thread as needing start.
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//
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// Eventually it registers the FIFO in the thread. If the thread has to be started it enables the channels up to the number of channels
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// allocated in the thread and starts the thread.
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//
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// Note: this is quite similar to the BladeRF2 start handling. The main difference is that the channel allocation (enabling) process is
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// done in the thread object.
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if (!m_deviceShared.m_device)
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{
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qDebug("SoapySDRInput::start: no device object");
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return false;
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return false;
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}
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int requestedChannel = m_deviceAPI->getItemIndex();
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SoapySDRInputThread *soapySDRInputThread = findThread();
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bool needsStart = false;
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if (soapySDRInputThread) // if thread is already allocated
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{
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qDebug("SoapySDRInput::start: thread is already allocated");
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int nbOriginalChannels = soapySDRInputThread->getNbChannels();
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if (requestedChannel+1 > nbOriginalChannels) // expansion by deleting and re-creating the thread
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{
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qDebug("SoapySDRInput::start: expand channels. Re-allocate thread and take ownership");
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SampleSinkFifo **fifos = new SampleSinkFifo*[nbOriginalChannels];
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unsigned int *log2Decims = new unsigned int[nbOriginalChannels];
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int *fcPoss = new int[nbOriginalChannels];
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for (int i = 0; i < nbOriginalChannels; i++) // save original FIFO references and data
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{
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fifos[i] = soapySDRInputThread->getFifo(i);
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log2Decims[i] = soapySDRInputThread->getLog2Decimation(i);
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fcPoss[i] = soapySDRInputThread->getFcPos(i);
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}
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soapySDRInputThread->stopWork();
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delete soapySDRInputThread;
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soapySDRInputThread = new SoapySDRInputThread(m_deviceShared.m_device, requestedChannel+1);
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m_thread = soapySDRInputThread; // take ownership
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for (int i = 0; i < nbOriginalChannels; i++) // restore original FIFO references
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{
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soapySDRInputThread->setFifo(i, fifos[i]);
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soapySDRInputThread->setLog2Decimation(i, log2Decims[i]);
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soapySDRInputThread->setFcPos(i, fcPoss[i]);
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}
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// remove old thread address from buddies (reset in all buddies). The address being held only in the owning source.
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const std::vector<DeviceSourceAPI*>& sourceBuddies = m_deviceAPI->getSourceBuddies();
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std::vector<DeviceSourceAPI*>::const_iterator it = sourceBuddies.begin();
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for (; it != sourceBuddies.end(); ++it) {
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((DeviceSoapySDRShared*) (*it)->getBuddySharedPtr())->m_source->setThread(0);
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}
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needsStart = true;
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}
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else
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{
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qDebug("SoapySDRInput::start: keep buddy thread");
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}
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}
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else // first allocation
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{
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qDebug("SoapySDRInput::start: allocate thread and take ownership");
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soapySDRInputThread = new SoapySDRInputThread(m_deviceShared.m_device, requestedChannel+1);
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m_thread = soapySDRInputThread; // take ownership
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needsStart = true;
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}
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soapySDRInputThread->setFifo(requestedChannel, &m_sampleFifo);
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soapySDRInputThread->setLog2Decimation(requestedChannel, m_settings.m_log2Decim);
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soapySDRInputThread->setFcPos(requestedChannel, (int) m_settings.m_fcPos);
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if (needsStart)
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{
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qDebug("SoapySDRInput::start: (re)sart buddy thread");
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soapySDRInputThread->startWork();
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}
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applySettings(m_settings, true);
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qDebug("SoapySDRInput::start: started");
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m_running = true;
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return true;
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}
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}
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void SoapySDRInput::stop()
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void SoapySDRInput::stop()
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{
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{
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// This stop method is responsible for managing the thread and channel disabling when the streaming of
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// a Rx channel is stopped
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//
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// If the thread is currently managing only one channel (SI mode). The thread can be just stopped and deleted.
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// Then the channel is closed (disabled).
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//
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// If the thread is currently managing many channels (MI mode) and we are removing the last channel. The transition
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// or reduction of MI size is handled by stopping the thread, deleting it and creating a new one
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// with one channel less if (and only if) there is still a channel active.
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//
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// If the thread is currently managing many channels (MI mode) but the channel being stopped is not the last
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// channel then the FIFO reference is simply removed from the thread so that it will not stream into this FIFO
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// anymore. In this case the channel is not closed (this is managed in the thread object) so that other channels
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// can continue with the same configuration. The device continues streaming on this channel but the samples are simply
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// dropped (by removing FIFO reference).
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//
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// Note: this is quite similar to the BladeRF2 stop handling. The main difference is that the channel allocation (enabling) process is
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// done in the thread object.
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if (!m_running) {
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return;
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}
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int requestedChannel = m_deviceAPI->getItemIndex();
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SoapySDRInputThread *soapySDRInputThread = findThread();
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if (soapySDRInputThread == 0) { // no thread allocated
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return;
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}
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int nbOriginalChannels = soapySDRInputThread->getNbChannels();
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if (nbOriginalChannels == 1) // SI mode => just stop and delete the thread
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{
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qDebug("SoapySDRInput::stop: SI mode. Just stop and delete the thread");
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soapySDRInputThread->stopWork();
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delete soapySDRInputThread;
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m_thread = 0;
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// remove old thread address from buddies (reset in all buddies)
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const std::vector<DeviceSourceAPI*>& sourceBuddies = m_deviceAPI->getSourceBuddies();
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std::vector<DeviceSourceAPI*>::const_iterator it = sourceBuddies.begin();
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for (; it != sourceBuddies.end(); ++it) {
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((DeviceSoapySDRShared*) (*it)->getBuddySharedPtr())->m_source->setThread(0);
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}
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}
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else if (requestedChannel == nbOriginalChannels - 1) // remove last MI channel => reduce by deleting and re-creating the thread
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{
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qDebug("SoapySDRInput::stop: MI mode. Reduce by deleting and re-creating the thread");
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soapySDRInputThread->stopWork();
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SampleSinkFifo **fifos = new SampleSinkFifo*[nbOriginalChannels-1];
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unsigned int *log2Decims = new unsigned int[nbOriginalChannels-1];
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int *fcPoss = new int[nbOriginalChannels-1];
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int highestActiveChannelIndex = -1;
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for (int i = 0; i < nbOriginalChannels-1; i++) // save original FIFO references and get the channel with highest index
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{
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fifos[i] = soapySDRInputThread->getFifo(i);
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if ((soapySDRInputThread->getFifo(i) != 0) && (i > highestActiveChannelIndex)) {
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highestActiveChannelIndex = i;
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}
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log2Decims[i] = soapySDRInputThread->getLog2Decimation(i);
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fcPoss[i] = soapySDRInputThread->getFcPos(i);
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}
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delete soapySDRInputThread;
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m_thread = 0;
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if (highestActiveChannelIndex >= 0) // there is at least one channel still active
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{
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soapySDRInputThread = new SoapySDRInputThread(m_deviceShared.m_device, highestActiveChannelIndex+1);
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m_thread = soapySDRInputThread; // take ownership
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for (int i = 0; i < highestActiveChannelIndex; i++) // restore original FIFO references
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{
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soapySDRInputThread->setFifo(i, fifos[i]);
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soapySDRInputThread->setLog2Decimation(i, log2Decims[i]);
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soapySDRInputThread->setFcPos(i, fcPoss[i]);
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}
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}
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else
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{
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qDebug("SoapySDRInput::stop: do not re-create thread as there are no more FIFOs active");
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}
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// remove old thread address from buddies (reset in all buddies). The address being held only in the owning source.
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const std::vector<DeviceSourceAPI*>& sourceBuddies = m_deviceAPI->getSourceBuddies();
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std::vector<DeviceSourceAPI*>::const_iterator it = sourceBuddies.begin();
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for (; it != sourceBuddies.end(); ++it) {
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((DeviceSoapySDRShared*) (*it)->getBuddySharedPtr())->m_source->setThread(0);
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}
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if (highestActiveChannelIndex >= 0) {
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soapySDRInputThread->startWork();
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}
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}
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else // remove channel from existing thread
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{
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qDebug("SoapySDRInput::stop: MI mode. Not changing MI configuration. Just remove FIFO reference");
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soapySDRInputThread->setFifo(requestedChannel, 0); // remove FIFO
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}
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m_running = false;
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}
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}
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QByteArray SoapySDRInput::serialize() const
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QByteArray SoapySDRInput::serialize() const
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