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Unified Diff: media/base/video_capturer_source.h

Issue 883293005: Cast: Basic cast_receiver API for chrome. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: removed extra BUILD.gn line Created 5 years, 10 months ago
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Index: media/base/video_capturer_source.h
diff --git a/media/base/video_capturer_source.h b/media/base/video_capturer_source.h
new file mode 100644
index 0000000000000000000000000000000000000000..56ec7296a9b9a89021e88b2d7c3ee5cf5fbd5f96
--- /dev/null
+++ b/media/base/video_capturer_source.h
@@ -0,0 +1,91 @@
+// Copyright (c) 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_VIDEO_CAPTURER_SOURCE_H_
+#define MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURER_SOURCE_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
+#include "media/base/media_export.h"
+#include "media/base/video_capture_types.h"
+#include "media/base/video_frame.h"
+
+namespace media {
+
+// VideoCapturerSource is an interface representing the source for
+// captured video. An implementation will periodically call the frame
+// callback with new video frames.
+class MEDIA_EXPORT VideoCapturerSource {
+ public:
+ virtual ~VideoCapturerSource();
+
+ // This callback is used to deliver video frames.
+ //
+ // |estimated_capture_time| - The capture time of the delivered video
+ // frame. This field represents the local time at which either: 1) the frame
+ // was generated, if it was done so locally; or 2) the targeted play-out time
+ // of the frame, if it was generated from a remote source. Either way, an
+ // implementation should not present the frame before this point-in-time. This
+ // value is NOT a high-resolution timestamp, and so it should not be used as a
+ // presentation time; but, instead, it should be used for buffering playback
+ // and for A/V synchronization purposes. NOTE: It is possible for this value
+ // to be null if the current implementation lacks this timing information.
+ //
+ // |video_frame->timestamp()| gives the presentation timestamp of the video
+ // frame relative to the first frame generated by the corresponding source.
+ // Because a source can start generating frames before a subscriber is added,
+ // the first video frame delivered may not have timestamp equal to 0.
+ typedef base::Callback<
+ void(const scoped_refptr<media::VideoFrame>& video_frame,
+ const media::VideoCaptureFormat& format,
+ const base::TimeTicks& estimated_capture_time)>
+ VideoCaptureDeliverFrameCB;
+
+ typedef base::Callback<void(const media::VideoCaptureFormats&)>
+ VideoCaptureDeviceFormatsCB;
+
+ typedef base::Callback<void(bool)> RunningCallback;
+
+ // Collects the formats that can currently be used.
+ // |max_requested_height|, |max_requested_width|, and
+ // |max_requested_frame_rate| is used by Tab and Screen capture to decide what
+ // resolution/framerate to generate. |callback| is triggered when the formats
+ // have been collected.
+ virtual void GetCurrentSupportedFormats(
+ int max_requested_width,
+ int max_requested_height,
+ double max_requested_frame_rate,
+ const VideoCaptureDeviceFormatsCB& callback) = 0;
+
+ // Starts capturing frames using the resolution in |params|.
+ // |new_frame_callback| is triggered on |frame_callback_task_runner|
+ // when a new video frame is available.
+ // If capturing is started successfully then |running_callback| will be
+ // called with a parameter of true. Note that some implementations may
+ // simply reject StartCapture (by calling running_callback with a false
+ // argument) if called with the wrong task runner.
+ // If capturing fails to start or stopped due to an external event then
+ // |running_callback| will be called with a parameter of false.
+ // |running_callback| will always be called on the same thread as the
+ // StartCapture.
+ virtual void StartCapture(
+ const media::VideoCaptureParams& params,
+ const VideoCaptureDeliverFrameCB& new_frame_callback,
+ scoped_refptr<base::SingleThreadTaskRunner> frame_callback_task_runner,
+ const RunningCallback& running_callback) = 0;
+
+ // Stops capturing frames and clears all callbacks including the
+ // SupportedFormatsCallback callback. Note that queued frame callbacks
+ // may still occur after this call, so the caller must take care to
+ // use refcounted or weak references in |new_frame_callback|.
+ virtual void StopCapture() = 0;
+};
+
+} // namespace media
+
+#endif // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURER_SOURCE_H_
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