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Unified Diff: media/capture/service/stream_impl.h

Issue 1699553002: Mojo Video Capture service in media/capture (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: perkj@s and magjed@s comments Created 4 years, 10 months ago
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Index: media/capture/service/stream_impl.h
diff --git a/media/capture/service/stream_impl.h b/media/capture/service/stream_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..332d37d4f8edf71dbe82c54acc940387164c26fa
--- /dev/null
+++ b/media/capture/service/stream_impl.h
@@ -0,0 +1,97 @@
+// Copyright 2016 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_CAPTURE_SERVICE_STREAM_IMPL_H_
+#define MEDIA_CAPTURE_SERVICE_STREAM_IMPL_H_
+
+#include <map>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "media/capture/interfaces/video_capture.mojom.h"
+#include "media/capture/service/video_capture_device_client_impl.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "mojo/public/cpp/system/buffer.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+class TimeTicks;
+}
+
+namespace media {
+class VideoFrame;
+}
+
+namespace media {
+
+class MojoVideoFrame;
+
+// This class bridges a VideoCaptureDeviceClientImpl with the mojo pipe where we
+// push captured VideoFrames.
+class StreamImpl : public mojom::VideoCaptureStream,
+ public VideoCaptureDeviceClientImpl::Delegate {
+ public:
+ // |start_callback| is called when this object is started by its client.
+ // |close_callback| is called when this object is stopped by its client.
+ // |error_callback| is called upon internal error or NotifyError().
+ StreamImpl(mojo::InterfaceRequest<mojom::VideoCaptureStream> request,
+ const base::Closure& start_callback,
+ const base::Closure& close_callback,
+ const base::Closure& error_callback);
+
+ ~StreamImpl() override;
+
+ // mojom::VideoCaptureStream
+ void Start(mojom::VideoCaptureStreamClientPtr client) override;
+ void Stop() override;
+
+ // VideoCaptureDeviceClientImpl::Delegate
+ void OnFrame(const scoped_refptr<MojoVideoFrame>& frame,
+ const base::TimeTicks& timestamp) override;
+ void OnError(const std::string& reason) override;
+
+ private:
+ friend class StreamImplTest;
+
+ // The following Notify* methods mimic those in StreamClient and act as a
+ // bridge to Mojo. They all must not be called until the stream has been
+ // Start()ed.
+
+ // Pushes a |frame| to the client.
+ void NotifyOnFrameAvailable(const scoped_refptr<MojoVideoFrame>& frame,
+ const base::TimeTicks& timestamp);
+ void NotifyError(const mojo::String& error);
+
+ // Bound to the client's OnFrameAvailable message to let it notify us that
+ // it's
+ // finished with the VideoFrame identified by |buffer_id|.
+ void OnFrameConsumed(int32_t buffer_id);
+
+ mojo::Binding<mojom::VideoCaptureStream> binding_;
+ const base::Closure start_callback_;
+ const base::Closure close_callback_;
+ const base::Closure error_callback_;
+
+ mojom::VideoCaptureStreamClientPtr client_;
+
+ // Map of VideoFrames in use by a client. Each VF gets an id assigned by which
+ // the client knows it. The buffer ID is just a simple running counter.
+ int running_buffer_id_ = 0;
+ std::map<int32_t, scoped_refptr<MojoVideoFrame>> in_use_video_frames_;
+
+ // The TaskRunner where this class lives, needed for OnFrame() and OnError()
+ // to PostTask() to.
+ const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+
+ base::WeakPtrFactory<StreamImpl> weak_factory_;
+
+ DISALLOW_COPY_AND_ASSIGN(StreamImpl);
+};
+
+} // namespace media
+
+#endif // MEDIA_CAPTURE_SERVICE_STREAM_IMPL_H_

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