Chromium Code Reviews

Unified Diff: media/video/capture/linux/v4l2_capture_delegate.h

Issue 1031583002: Revert of Linux Video Capture: Add V4L2VideoCaptureDelegate{Single,Multi}Plane. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 5 years, 9 months ago
Use n/p to move between diff chunks; N/P to move between comments.
Jump to:
View side-by-side diff with in-line comments
Index: media/video/capture/linux/v4l2_capture_delegate.h
diff --git a/media/video/capture/linux/v4l2_capture_delegate.h b/media/video/capture/linux/v4l2_capture_delegate.h
deleted file mode 100644
index bd0ccad6cf73c30263474a6ca616784c3ca1e33d..0000000000000000000000000000000000000000
--- a/media/video/capture/linux/v4l2_capture_delegate.h
+++ /dev/null
@@ -1,150 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef MEDIA_VIDEO_CAPTURE_LINUX_V4L2_VIDEO_CAPTURE_DELEGATE_H_
-#define MEDIA_VIDEO_CAPTURE_LINUX_V4L2_VIDEO_CAPTURE_DELEGATE_H_
-
-#if defined(OS_OPENBSD)
-#include <sys/videoio.h>
-#else
-#include <linux/videodev2.h>
-#endif
-
-#include "base/files/scoped_file.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_vector.h"
-#include "media/video/capture/video_capture_device.h"
-
-namespace media {
-
-// Class doing the actual Linux capture using V4L2 API. V4L2 SPLANE/MPLANE
-// capture specifics are implemented in derived classes. Created and destroyed
-// on the owner's thread, otherwise living and operating on |v4l2_task_runner_|.
-class V4L2CaptureDelegate
- : public base::RefCountedThreadSafe<V4L2CaptureDelegate> {
- public:
- // Creates the appropiate VideoCaptureDelegate according to parameters.
- static scoped_refptr<V4L2CaptureDelegate> CreateV4L2CaptureDelegate(
- const VideoCaptureDevice::Name& device_name,
- const scoped_refptr<base::SingleThreadTaskRunner>& v4l2_task_runner,
- int power_line_frequency);
-
- // Retrieves the #planes for a given |fourcc|, or 0 if unknown.
- static size_t GetNumPlanesForFourCc(uint32_t fourcc);
- // Returns the Chrome pixel format for |v4l2_fourcc| or PIXEL_FORMAT_UNKNOWN.
- static VideoPixelFormat V4l2FourCcToChromiumPixelFormat(uint32_t v4l2_fourcc);
-
- // Composes a list of usable and supported pixel formats, in order of
- // preference, with MJPEG prioritised depending on |prefer_mjpeg|.
- static std::list<uint32_t> GetListOfUsableFourCcs(bool prefer_mjpeg);
-
- // Forward-to versions of VideoCaptureDevice virtual methods.
- void AllocateAndStart(int width,
- int height,
- float frame_rate,
- scoped_ptr<VideoCaptureDevice::Client> client);
- void StopAndDeAllocate();
-
- void SetRotation(int rotation);
-
- protected:
- // Class keeping track of SPLANE/MPLANE V4L2 buffers, mmap()ed on construction
- // and munmap()ed on destruction. Destruction is syntactically equal for
- // S/MPLANE but not construction, so this is implemented in derived classes.
- // Internally it has a vector of planes, which for SPLANE will contain only
- // one element.
- class BufferTracker : public base::RefCounted<BufferTracker> {
- public:
- BufferTracker();
- // Abstract method to mmap() given |fd| according to |buffer|, planarity
- // specific.
- virtual bool Init(int fd, const v4l2_buffer& buffer) = 0;
-
- uint8_t* const GetPlaneStart(size_t plane) const {
- DCHECK_LT(plane, planes_.size());
- return planes_[plane].start;
- }
-
- protected:
- friend class base::RefCounted<BufferTracker>;
- virtual ~BufferTracker();
- // Adds a given mmap()ed plane to |planes_|.
- void AddMmapedPlane(uint8_t* const start, size_t length);
-
- private:
- struct Plane {
- uint8_t* start;
- size_t length;
- };
- std::vector<Plane> planes_;
- };
-
- V4L2CaptureDelegate(
- const VideoCaptureDevice::Name& device_name,
- const scoped_refptr<base::SingleThreadTaskRunner>& v4l2_task_runner,
- int power_line_frequency);
- virtual ~V4L2CaptureDelegate();
-
- // Creates the necessary, planarity-specific, internal tracking schemes,
- virtual scoped_refptr<BufferTracker> CreateBufferTracker() const = 0;
-
- // Fill in |format| with the given parameters, in a planarity dependent way.
- virtual bool FillV4L2Format(v4l2_format* format,
- uint32_t width,
- uint32_t height,
- uint32_t pixelformat_fourcc) const = 0;
-
- // Finish filling |buffer| struct with planarity-dependent data.
- virtual void FinishFillingV4L2Buffer(v4l2_buffer* buffer) const = 0;
-
- // Sends the captured |buffer| to the |client_|, synchronously.
- virtual void SendBuffer(
- const scoped_refptr<BufferTracker>& buffer_tracker,
- const v4l2_format& format) const = 0;
-
- // A few accessors for SendBuffer()'s to access private member variables.
- VideoCaptureFormat capture_format() const { return capture_format_; }
- VideoCaptureDevice::Client* client() const { return client_.get(); }
- int rotation() const { return rotation_; }
-
- private:
- friend class base::RefCountedThreadSafe<V4L2CaptureDelegate>;
-
- // Returns the input |fourcc| as a std::string four char representation.
- static std::string FourccToString(uint32_t fourcc);
- // VIDIOC_QUERYBUFs a buffer from V4L2, creates a BufferTracker for it and
- // enqueues it (VIDIOC_QBUF) back into V4L2.
- bool MapAndQueueBuffer(int index);
- // Fills all common parts of |buffer|. Delegates to FinishFillingV4L2Buffer()
- // for filling in the planar-dependent parts.
- void FillV4L2Buffer(v4l2_buffer* buffer, int i) const;
- void DoCapture();
- void SetErrorState(const std::string& reason);
-
- const v4l2_buf_type capture_type_;
- const scoped_refptr<base::SingleThreadTaskRunner> v4l2_task_runner_;
- const VideoCaptureDevice::Name device_name_;
- const int power_line_frequency_;
-
- // The following members are only known on AllocateAndStart().
- VideoCaptureFormat capture_format_;
- v4l2_format video_fmt_;
- scoped_ptr<VideoCaptureDevice::Client> client_;
- base::ScopedFD device_fd_;
-
- // Vector of BufferTracker to keep track of mmap()ed pointers and their use.
- std::vector<scoped_refptr<BufferTracker>> buffer_tracker_pool_;
-
- bool is_capturing_;
- int timeout_count_;
-
- // Clockwise rotation in degrees. This value should be 0, 90, 180, or 270.
- int rotation_;
-
- DISALLOW_COPY_AND_ASSIGN(V4L2CaptureDelegate);
-};
-
-} // namespace media
-
-#endif // MEDIA_VIDEO_CAPTURE_LINUX_V4L2_VIDEO_CAPTURE_DELEGATE_H_
« no previous file with comments | « media/video/capture/fake_video_capture_device_unittest.cc ('k') | media/video/capture/linux/v4l2_capture_delegate.cc » ('j') | no next file with comments »

Powered by Google App Engine