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.
+// TODO(hshi): merge this with VEA interface. http://crbug.com/248334.
+class EncodedVideoSource {
+ public:
+  class Client {
+   public:
+    // Notifies client that bitstream is opened successfully. The |params|
+    // contains the actual encoding parameters chosen by the browser process.
+    // It may be different from the params requested in OpenBitstream().
+    virtual void OnOpened(const VideoEncodingParameters& params) = 0;
+
+    // Notifies client that bitstream is closed. After this call it is
+    // guaranteed that client will not receive further calls.
+    virtual void OnClosed() = 0;
+
+    // Delivers an encoded bitstream buffer to the client.
+    virtual void OnBufferReady(
+        scoped_refptr<const EncodedBitstreamBuffer> buffer) = 0;
+
+    // Notifies client that encoding parameters has changed. The |params|
+    // contains the current encoding parameters chosen by the browser process.
+    // It may be different from the params requested in TrySetBitstreamConfig().
+    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 be 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
+  // signaling successful change.
+  virtual void TrySetBitstreamConfig(
+      const RuntimeVideoEncodingParameters& params) = 0;
+};
+
+}  // namespace media
+
+#endif  // MEDIA_VIDEO_ENCODED_VIDEO_SOURCE_H_
+