diff options
Diffstat (limited to 'src/libcamera/v4l2_videodevice.cpp')
| -rw-r--r-- | src/libcamera/v4l2_videodevice.cpp | 313 |
1 files changed, 303 insertions, 10 deletions
diff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp index 84c45dbc..dd120129 100644 --- a/src/libcamera/v4l2_videodevice.cpp +++ b/src/libcamera/v4l2_videodevice.cpp @@ -410,7 +410,8 @@ const std::string V4L2DeviceFormat::toString() const * \param[in] deviceNode The file-system path to the video device node */ V4L2VideoDevice::V4L2VideoDevice(const std::string &deviceNode) - : V4L2Device(deviceNode), bufferPool_(nullptr), fdEvent_(nullptr) + : V4L2Device(deviceNode), bufferPool_(nullptr), cache_(nullptr), + fdEvent_(nullptr) { /* * We default to an MMAP based CAPTURE video device, however this will @@ -1075,6 +1076,94 @@ int V4L2VideoDevice::importBuffers(BufferPool *pool) return 0; } +/** + * \brief Allocate buffers from the video device + * \param[in] count Number of buffers to allocate + * \param[out] buffers Vector to store allocated buffers + * \return 0 on success or a negative error code otherwise + */ +int V4L2VideoDevice::exportBuffers(unsigned int count, + std::vector<std::unique_ptr<FrameBuffer>> *buffers) +{ + if (cache_) { + LOG(V4L2, Error) << "Buffers already allocated"; + return -EINVAL; + } + + memoryType_ = V4L2_MEMORY_MMAP; + + int ret = requestBuffers(count); + if (ret < 0) + return ret; + + for (unsigned i = 0; i < count; ++i) { + struct v4l2_buffer buf = {}; + struct v4l2_plane planes[VIDEO_MAX_PLANES] = {}; + + buf.index = i; + buf.type = bufferType_; + buf.memory = memoryType_; + buf.length = ARRAY_SIZE(planes); + buf.m.planes = planes; + + ret = ioctl(VIDIOC_QUERYBUF, &buf); + if (ret < 0) { + LOG(V4L2, Error) + << "Unable to query buffer " << i << ": " + << strerror(-ret); + goto err_buf; + } + + std::unique_ptr<FrameBuffer> buffer = createFrameBuffer(buf); + if (!buffer) { + LOG(V4L2, Error) << "Unable to create buffer"; + ret = -EINVAL; + goto err_buf; + } + + buffers->push_back(std::move(buffer)); + } + + cache_ = new V4L2BufferCache(*buffers); + + return count; + +err_buf: + requestBuffers(0); + + buffers->clear(); + + return ret; +} + +std::unique_ptr<FrameBuffer> +V4L2VideoDevice::createFrameBuffer(const struct v4l2_buffer &buf) +{ + const bool multiPlanar = V4L2_TYPE_IS_MULTIPLANAR(buf.type); + const unsigned int numPlanes = multiPlanar ? buf.length : 1; + + if (numPlanes == 0 || numPlanes > VIDEO_MAX_PLANES) { + LOG(V4L2, Error) << "Invalid number of planes"; + return nullptr; + } + + std::vector<FrameBuffer::Plane> planes; + for (unsigned int nplane = 0; nplane < numPlanes; nplane++) { + FileDescriptor fd = exportDmabufFd(buf.index, nplane); + if (!fd.isValid()) + return nullptr; + + FrameBuffer::Plane plane; + plane.fd = std::move(fd); + plane.length = multiPlanar ? + buf.m.planes[nplane].length : buf.length; + + planes.push_back(std::move(plane)); + } + + return utils::make_unique<FrameBuffer>(std::move(planes)); +} + FileDescriptor V4L2VideoDevice::exportDmabufFd(unsigned int index, unsigned int plane) { @@ -1097,13 +1186,40 @@ FileDescriptor V4L2VideoDevice::exportDmabufFd(unsigned int index, } /** + * \brief Prepare the device to import \a count buffers + * \param[in] count Number of buffers to prepare to import + * \return 0 on success or a negative error code otherwise + */ +int V4L2VideoDevice::importBuffers(unsigned int count) +{ + if (cache_) { + LOG(V4L2, Error) << "Buffers already allocated"; + return -EINVAL; + } + + memoryType_ = V4L2_MEMORY_DMABUF; + + int ret = requestBuffers(count); + if (ret) + return ret; + + cache_ = new V4L2BufferCache(count); + + LOG(V4L2, Debug) << "Prepared to import " << count << " buffers"; + + return 0; +} + +/** * \brief Release all internally allocated buffers */ int V4L2VideoDevice::releaseBuffers() { - LOG(V4L2, Debug) << "Releasing bufferPool"; + LOG(V4L2, Debug) << "Releasing buffers"; bufferPool_ = nullptr; + delete cache_; + cache_ = nullptr; return requestBuffers(0); } @@ -1223,6 +1339,90 @@ std::vector<std::unique_ptr<Buffer>> V4L2VideoDevice::queueAllBuffers() } /** + * \brief Queue a buffer to the video device + * \param[in] buffer The buffer to be queued + * + * For capture video devices the \a buffer will be filled with data by the + * device. For output video devices the \a buffer shall contain valid data and + * will be processed by the device. Once the device has finished processing the + * buffer, it will be available for dequeue. + * + * The best available V4L2 buffer is picked for \a buffer using the V4L2 buffer + * cache. + * + * \return 0 on success or a negative error code otherwise + */ +int V4L2VideoDevice::queueBuffer(FrameBuffer *buffer) +{ + struct v4l2_plane v4l2Planes[VIDEO_MAX_PLANES] = {}; + struct v4l2_buffer buf = {}; + int ret; + + ret = cache_->get(*buffer); + if (ret < 0) + return ret; + + buf.index = ret; + buf.type = bufferType_; + buf.memory = memoryType_; + buf.field = V4L2_FIELD_NONE; + + bool multiPlanar = V4L2_TYPE_IS_MULTIPLANAR(buf.type); + const std::vector<FrameBuffer::Plane> &planes = buffer->planes(); + + if (buf.memory == V4L2_MEMORY_DMABUF) { + if (multiPlanar) { + for (unsigned int p = 0; p < planes.size(); ++p) + v4l2Planes[p].m.fd = planes[p].fd.fd(); + } else { + buf.m.fd = planes[0].fd.fd(); + } + } + + if (multiPlanar) { + buf.length = planes.size(); + buf.m.planes = v4l2Planes; + } + + if (V4L2_TYPE_IS_OUTPUT(buf.type)) { + const FrameMetadata &metadata = buffer->metadata(); + + if (multiPlanar) { + unsigned int nplane = 0; + for (const FrameMetadata::Plane &plane : metadata.planes) { + v4l2Planes[nplane].bytesused = plane.bytesused; + v4l2Planes[nplane].length = buffer->planes()[nplane].length; + nplane++; + } + } else { + if (metadata.planes.size()) + buf.bytesused = metadata.planes[0].bytesused; + } + + buf.sequence = metadata.sequence; + buf.timestamp.tv_sec = metadata.timestamp / 1000000000; + buf.timestamp.tv_usec = (metadata.timestamp / 1000) % 1000000; + } + + LOG(V4L2, Debug) << "Queueing buffer " << buf.index; + + ret = ioctl(VIDIOC_QBUF, &buf); + if (ret < 0) { + LOG(V4L2, Error) + << "Failed to queue buffer " << buf.index << ": " + << strerror(-ret); + return ret; + } + + if (queuedFrameBuffers_.empty()) + fdEvent_->setEnabled(true); + + queuedFrameBuffers_[buf.index] = buffer; + + return 0; +} + +/** * \brief Dequeue the next available buffer from the video device * * This method dequeues the next available buffer from the device. If no buffer @@ -1281,17 +1481,97 @@ Buffer *V4L2VideoDevice::dequeueBuffer() * When this slot is called, a Buffer has become available from the device, and * will be emitted through the bufferReady Signal. * - * For Capture video devices the Buffer will contain valid data. - * For Output video devices the Buffer can be considered empty. + * For Capture video devices the FrameBuffer will contain valid data. + * For Output video devices the FrameBuffer can be considered empty. */ void V4L2VideoDevice::bufferAvailable(EventNotifier *notifier) { - Buffer *buffer = dequeueBuffer(); - if (!buffer) - return; + /* + * This is a hack which allows both Buffer and FrameBuffer interfaces + * to work with the same code base. This allows different parts of + * libcamera to migrate to FrameBuffer in different patches. + * + * If we have a cache_ we know FrameBuffer is in use. + * + * \todo Remove this hack when the Buffer interface is removed. + */ + if (cache_) { + FrameBuffer *buffer = dequeueFrameBuffer(); + if (!buffer) + return; - /* Notify anyone listening to the device. */ - bufferReady.emit(buffer); + /* Notify anyone listening to the device. */ + frameBufferReady.emit(buffer); + } else { + Buffer *buffer = dequeueBuffer(); + if (!buffer) + return; + + /* Notify anyone listening to the device. */ + bufferReady.emit(buffer); + } +} + +/** + * \brief Dequeue the next available buffer from the video device + * + * This method dequeues the next available buffer from the device. If no buffer + * is available to be dequeued it will return nullptr immediately. + * + * \todo Rename to dequeueBuffer() once the FrameBuffer transition is complete + * + * \return A pointer to the dequeued buffer on success, or nullptr otherwise + */ +FrameBuffer *V4L2VideoDevice::dequeueFrameBuffer() +{ + struct v4l2_buffer buf = {}; + struct v4l2_plane planes[VIDEO_MAX_PLANES] = {}; + int ret; + + buf.type = bufferType_; + buf.memory = memoryType_; + + bool multiPlanar = V4L2_TYPE_IS_MULTIPLANAR(buf.type); + + if (multiPlanar) { + buf.length = VIDEO_MAX_PLANES; + buf.m.planes = planes; + } + + ret = ioctl(VIDIOC_DQBUF, &buf); + if (ret < 0) { + LOG(V4L2, Error) + << "Failed to dequeue buffer: " << strerror(-ret); + return nullptr; + } + + LOG(V4L2, Debug) << "Dequeuing buffer " << buf.index; + + cache_->put(buf.index); + + auto it = queuedFrameBuffers_.find(buf.index); + FrameBuffer *buffer = it->second; + queuedFrameBuffers_.erase(it); + + if (queuedFrameBuffers_.empty()) + fdEvent_->setEnabled(false); + + buffer->metadata_.status = buf.flags & V4L2_BUF_FLAG_ERROR + ? FrameMetadata::FrameError + : FrameMetadata::FrameSuccess; + buffer->metadata_.sequence = buf.sequence; + buffer->metadata_.timestamp = buf.timestamp.tv_sec * 1000000000ULL + + buf.timestamp.tv_usec * 1000ULL; + + buffer->metadata_.planes.clear(); + if (multiPlanar) { + for (unsigned int nplane = 0; nplane < buf.length; nplane++) + buffer->metadata_.planes.push_back({ planes[nplane].bytesused }); + } else { + buffer->metadata_.planes.push_back({ buf.bytesused }); + } + + return buffer; } /** @@ -1300,6 +1580,11 @@ void V4L2VideoDevice::bufferAvailable(EventNotifier *notifier) */ /** + * \var V4L2VideoDevice::frameBufferReady + * \brief A Signal emitted when a framebuffer completes + */ + +/** * \brief Start the video stream * \return 0 on success or a negative error code otherwise */ @@ -1321,7 +1606,7 @@ int V4L2VideoDevice::streamOn() * \brief Stop the video stream * * Buffers that are still queued when the video stream is stopped are - * immediately dequeued with their status set to Buffer::BufferError, + * immediately dequeued with their status set to FrameMetadata::FrameCancelled, * and the bufferReady signal is emitted for them. The order in which those * buffers are dequeued is not specified. * @@ -1348,7 +1633,15 @@ int V4L2VideoDevice::streamOff() bufferReady.emit(buffer); } + for (auto it : queuedFrameBuffers_) { + FrameBuffer *buffer = it.second; + + buffer->metadata_.status = FrameMetadata::FrameCancelled; + frameBufferReady.emit(buffer); + } + queuedBuffers_.clear(); + queuedFrameBuffers_.clear(); fdEvent_->setEnabled(false); return 0; |