From 9da27d5d844fa1378a4897a637c45ade275cc7e5 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Sat, 14 Mar 2020 16:14:27 +0200 Subject: libcamera: pipeline_handler: Decouple buffer import and export MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Use the V4L2 buffer orphaning feature, exposed through V4L2VideoDevice::exportBuffers(), to decouple buffer import and export. The PipelineHandler::importFrameBuffers() function is now called for all streams regardless of whether exportFrameBuffers() has been called or not. This simplifies the Camera implementation slightly, and opens the door to additional simplifications. Signed-off-by: Laurent Pinchart Reviewed-by: Niklas Söderlund --- include/libcamera/camera.h | 1 - src/libcamera/camera.cpp | 21 +-------------------- src/libcamera/framebuffer_allocator.cpp | 9 --------- src/libcamera/pipeline/ipu3/ipu3.cpp | 2 +- src/libcamera/pipeline/rkisp1/rkisp1.cpp | 2 +- src/libcamera/pipeline/uvcvideo.cpp | 2 +- src/libcamera/pipeline/vimc.cpp | 2 +- src/libcamera/pipeline_handler.cpp | 25 +++++-------------------- 8 files changed, 10 insertions(+), 54 deletions(-) diff --git a/include/libcamera/camera.h b/include/libcamera/camera.h index c453b952..a5e2b49f 100644 --- a/include/libcamera/camera.h +++ b/include/libcamera/camera.h @@ -113,7 +113,6 @@ private: friend class FrameBufferAllocator; int exportFrameBuffers(Stream *stream, std::vector> *buffers); - int freeFrameBuffers(Stream *stream); /* \todo Remove allocator_ from the exposed API */ FrameBufferAllocator *allocator_; }; diff --git a/src/libcamera/camera.cpp b/src/libcamera/camera.cpp index 9c432adb..3192dfb4 100644 --- a/src/libcamera/camera.cpp +++ b/src/libcamera/camera.cpp @@ -554,18 +554,6 @@ int Camera::exportFrameBuffers(Stream *stream, buffers); } -int Camera::freeFrameBuffers(Stream *stream) -{ - int ret = p_->isAccessAllowed(Private::CameraConfigured, true); - if (ret < 0) - return ret; - - p_->pipe_->invokeMethod(&PipelineHandler::freeFrameBuffers, - ConnectionTypeBlocking, this, stream); - - return 0; -} - /** * \brief Acquire the camera device for exclusive access * @@ -928,9 +916,6 @@ int Camera::start() LOG(Camera, Debug) << "Starting capture"; for (Stream *stream : p_->activeStreams_) { - if (allocator_ && !allocator_->buffers(stream).empty()) - continue; - ret = p_->pipe_->invokeMethod(&PipelineHandler::importFrameBuffers, ConnectionTypeDirect, this, stream); if (ret < 0) @@ -974,13 +959,9 @@ int Camera::stop() p_->pipe_->invokeMethod(&PipelineHandler::stop, ConnectionTypeBlocking, this); - for (Stream *stream : p_->activeStreams_) { - if (allocator_ && !allocator_->buffers(stream).empty()) - continue; - + for (Stream *stream : p_->activeStreams_) p_->pipe_->invokeMethod(&PipelineHandler::freeFrameBuffers, ConnectionTypeBlocking, this, stream); - } return 0; } diff --git a/src/libcamera/framebuffer_allocator.cpp b/src/libcamera/framebuffer_allocator.cpp index e79f4a8f..6f7a2e90 100644 --- a/src/libcamera/framebuffer_allocator.cpp +++ b/src/libcamera/framebuffer_allocator.cpp @@ -87,11 +87,6 @@ FrameBufferAllocator::FrameBufferAllocator(std::shared_ptr camera) FrameBufferAllocator::~FrameBufferAllocator() { - for (auto &value : buffers_) { - Stream *stream = value.first; - camera_->freeFrameBuffers(stream); - } - buffers_.clear(); camera_->allocator_ = nullptr; @@ -148,10 +143,6 @@ int FrameBufferAllocator::free(Stream *stream) if (iter == buffers_.end()) return -EINVAL; - int ret = camera_->freeFrameBuffers(stream); - if (ret < 0) - return ret; - std::vector> &buffers = iter->second; buffers.clear(); buffers_.erase(iter); diff --git a/src/libcamera/pipeline/ipu3/ipu3.cpp b/src/libcamera/pipeline/ipu3/ipu3.cpp index d7eac553..2edca02e 100644 --- a/src/libcamera/pipeline/ipu3/ipu3.cpp +++ b/src/libcamera/pipeline/ipu3/ipu3.cpp @@ -621,7 +621,7 @@ int PipelineHandlerIPU3::exportFrameBuffers(Camera *camera, Stream *stream, V4L2VideoDevice *video = ipu3stream->device_->dev; unsigned int count = stream->configuration().bufferCount; - return video->allocateBuffers(count, buffers); + return video->exportBuffers(count, buffers); } int PipelineHandlerIPU3::importFrameBuffers(Camera *camera, Stream *stream) diff --git a/src/libcamera/pipeline/rkisp1/rkisp1.cpp b/src/libcamera/pipeline/rkisp1/rkisp1.cpp index 3734bb72..eafb6d91 100644 --- a/src/libcamera/pipeline/rkisp1/rkisp1.cpp +++ b/src/libcamera/pipeline/rkisp1/rkisp1.cpp @@ -664,7 +664,7 @@ int PipelineHandlerRkISP1::exportFrameBuffers(Camera *camera, Stream *stream, std::vector> *buffers) { unsigned int count = stream->configuration().bufferCount; - return video_->allocateBuffers(count, buffers); + return video_->exportBuffers(count, buffers); } int PipelineHandlerRkISP1::importFrameBuffers(Camera *camera, Stream *stream) diff --git a/src/libcamera/pipeline/uvcvideo.cpp b/src/libcamera/pipeline/uvcvideo.cpp index 10597111..9876d8c9 100644 --- a/src/libcamera/pipeline/uvcvideo.cpp +++ b/src/libcamera/pipeline/uvcvideo.cpp @@ -211,7 +211,7 @@ int PipelineHandlerUVC::exportFrameBuffers(Camera *camera, Stream *stream, UVCCameraData *data = cameraData(camera); unsigned int count = stream->configuration().bufferCount; - return data->video_->allocateBuffers(count, buffers); + return data->video_->exportBuffers(count, buffers); } int PipelineHandlerUVC::importFrameBuffers(Camera *camera, Stream *stream) diff --git a/src/libcamera/pipeline/vimc.cpp b/src/libcamera/pipeline/vimc.cpp index 85f38693..097bbd5b 100644 --- a/src/libcamera/pipeline/vimc.cpp +++ b/src/libcamera/pipeline/vimc.cpp @@ -264,7 +264,7 @@ int PipelineHandlerVimc::exportFrameBuffers(Camera *camera, Stream *stream, VimcCameraData *data = cameraData(camera); unsigned int count = stream->configuration().bufferCount; - return data->video_->allocateBuffers(count, buffers); + return data->video_->exportBuffers(count, buffers); } int PipelineHandlerVimc::importFrameBuffers(Camera *camera, Stream *stream) diff --git a/src/libcamera/pipeline_handler.cpp b/src/libcamera/pipeline_handler.cpp index 8d623f54..e5034c54 100644 --- a/src/libcamera/pipeline_handler.cpp +++ b/src/libcamera/pipeline_handler.cpp @@ -337,16 +337,7 @@ const ControlList &PipelineHandler::properties(Camera *camera) * * The method may only be called after the Camera has been configured and before * it gets started, or after it gets stopped. It shall be called only for - * streams that are part of the active camera configuration, and at most once - * per stream until buffers for the stream are freed with freeFrameBuffers(). - * - * exportFrameBuffers() shall also allocate all other resources required by - * the pipeline handler for the stream to prepare for starting the Camera. This - * responsibility is shared with importFrameBuffers(), and one and only one of - * those two methods shall be called for each stream until the buffers are - * freed. The pipeline handler shall support all combinations of - * exportFrameBuffers() and importFrameBuffers() for the streams contained in - * any camera configuration. + * streams that are part of the active camera configuration. * * The only intended caller is Camera::exportFrameBuffers(). * @@ -371,12 +362,7 @@ const ControlList &PipelineHandler::properties(Camera *camera) * per stream until buffers for the stream are freed with freeFrameBuffers(). * * importFrameBuffers() shall also allocate all other resources required by the - * pipeline handler for the stream to prepare for starting the Camera. This - * responsibility is shared with exportFrameBuffers(), and one and only one of - * those two methods shall be called for each stream until the buffers are - * freed. The pipeline handler shall support all combinations of - * exportFrameBuffers() and importFrameBuffers() for the streams contained in - * any camera configuration. + * pipeline handler for the stream to prepare for starting the Camera. * * The only intended caller is Camera::start(). * @@ -391,10 +377,9 @@ const ControlList &PipelineHandler::properties(Camera *camera) * \param[in] camera The camera * \param[in] stream The stream to free buffers for * - * This method shall free all buffers and all other resources allocated for the - * \a stream by exportFrameBuffers() or importFrameBuffers(). It shall be - * called only after a successful call to either of these two methods, and only - * once per stream. + * This method shall release all resources allocated for the \a stream by + * importFrameBuffers(). It shall be called only after a successful call that + * method, and only once per stream. * * The only intended callers are Camera::stop() and Camera::freeFrameBuffers(). * -- cgit v1.2.1