Define EncodedVideoSource and RtcCapturedEncodingVideoCapturer.

media/video/encoded_video_source.h

+// Copyright (c) 2013 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_ENCODED_VIDEO_SOURCE_H_
+#define MEDIA_VIDEO_ENCODED_VIDEO_SOURCE_H_
+
+#include "base/memory/ref_counted.h"
+#include "media/base/encoded_bitstream_buffer.h"
+#include "media/video/video_encode_types.h"
+
+namespace media {
+
+// Class to represent any encoded video source. Anything that provides encoded
+// video can be an EncodedVideoSource. Notable examples of this can be video
+// encoder and webcam that has encoding capabilities.
+class MEDIA_EXPORT EncodedVideoSource {
+ public:
+  class MEDIA_EXPORT Client {
+   public:
+    // After OnStreaming callback stream shall be considered to be streaming.
+    virtual void OnStreaming(const VideoEncodingParameters& params) = 0;
+
+    // After OnClosed client has to stop using the bitstream object and
+    // expecting bitstream buffers for that stream. OnClosed will be called
+    // also in case of any unrecoverable failure in the capturer. After
+    // OnClosed is called from a stream it is guaranteed that that there will
+    // be no longer pending calls coming in.
+    virtual void OnClosed() = 0;
+
+    // OnBufferReady delivers the captured bitstream buffer by buffer to the
+    // client.
+    virtual void OnBufferReady(
+        scoped_refptr<const EncodedBitstreamBuffer> buffer) = 0;
+
+    // OnConfigChanged informs about change in bitstream parameters.
+    virtual void OnConfigChanged(
+        const RuntimeVideoEncodingParameters& params) = 0;
+  };
+
+  // Callback is invoked once RequestCapabilities() is complete.
+  typedef base::Callback<void(const VideoEncodingCapabilities& capabilities)>
+      RequestCapabilitiesCallback;
+
+  // RequestCapabilities initiates an asynchronous query for the types of
+  // encoded bitstream supported by the encoder. This call should invoked only
+  // once. EncodedVideoSource will invoke |callback| when capabilities become
+  // available.
+  virtual void RequestCapabilities(
+      const RequestCapabilitiesCallback& callback) = 0;
+
+  // OpenBitstream opens the bitstream on the encoded video source. Only one
+  // bitstream can be opened for an encoded video source.
+  virtual void OpenBitstream(Client* client,
+                             const VideoEncodingParameters& params) = 0;
+
+  // CloseBitstream closes the bitstream.
+  virtual void CloseBitstream() = 0;
+
+  // ReturnBitstreamBuffer notifies that the data within the buffer has been
+  // processed and it can be reused to encode upcoming bitstream.
+  virtual void ReturnBitstreamBuffer(
+      scoped_refptr<const media::EncodedBitstreamBuffer> buffer) = 0;
+
+  // TrySetBitstreamConfig requests to change encoding parameters. Old config
+  // must be considered valid until OnConfigChanged is invoked on the client
+  // signalling successful change.
+  virtual void TrySetBitstreamConfig(
+      const RuntimeVideoEncodingParameters& params) = 0;
+};
+
+}  // namespace media
+
+#endif  // MEDIA_VIDEO_ENCODED_VIDEO_SOURCE_H_
+