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+/*
+ * libjingle
+ * Copyright 2004 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TALK_MEDIA_BASE_MEDIAENGINE_H_
+#define TALK_MEDIA_BASE_MEDIAENGINE_H_
+
+#ifdef OSX
+#include <CoreAudio/CoreAudio.h>
+#endif
+
+#include <string>
+#include <vector>
+
+#include "talk/media/base/codec.h"
+#include "talk/media/base/mediachannel.h"
+#include "talk/media/base/mediacommon.h"
+#include "talk/media/base/videocapturer.h"
+#include "talk/media/base/videocommon.h"
+#include "talk/media/base/voiceprocessor.h"
+#include "talk/media/devices/devicemanager.h"
+#include "webrtc/base/fileutils.h"
+#include "webrtc/base/sigslotrepeater.h"
+
+#if defined(GOOGLE_CHROME_BUILD) || defined(CHROMIUM_BUILD)
+#define DISABLE_MEDIA_ENGINE_FACTORY
+#endif
+
+namespace webrtc {
+class Call;
+class VoiceEngine;
+}
+
+namespace cricket {
+
+class VideoCapturer;
+
+// MediaEngineInterface is an abstraction of a media engine which can be
+// subclassed to support different media componentry backends.
+// It supports voice and video operations in the same class to facilitate
+// proper synchronization between both media types.
+class MediaEngineInterface {
+ public:
+  virtual ~MediaEngineInterface() {}
+
+  // Initialization
+  // Starts the engine.
+  virtual bool Init(rtc::Thread* worker_thread) = 0;
+  // Shuts down the engine.
+  virtual void Terminate() = 0;
+  // TODO(solenberg): Remove once VoE API refactoring is done.
+  virtual webrtc::VoiceEngine* GetVoE() = 0;
+
+  // MediaChannel creation
+  // Creates a voice media channel. Returns NULL on failure.
+  virtual VoiceMediaChannel* CreateChannel(
+      webrtc::Call* call,
+      const AudioOptions& options) = 0;
+  // Creates a video media channel, paired with the specified voice channel.
+  // Returns NULL on failure.
+  virtual VideoMediaChannel* CreateVideoChannel(
+      webrtc::Call* call,
+      const VideoOptions& options) = 0;
+
+  // Configuration
+  // Gets global audio options.
+  virtual AudioOptions GetAudioOptions() const = 0;
+  // Sets global audio options. "options" are from AudioOptions, above.
+  virtual bool SetAudioOptions(const AudioOptions& options) = 0;
+  // Sets the default (maximum) codec/resolution and encoder option to capture
+  // and encode video.
+  virtual bool SetDefaultVideoEncoderConfig(const VideoEncoderConfig& config)
+      = 0;
+
+  // Device selection
+  virtual bool SetSoundDevices(const Device* in_device,
+                               const Device* out_device) = 0;
+
+  // Device configuration
+  // Gets the current speaker volume, as a value between 0 and 255.
+  virtual bool GetOutputVolume(int* level) = 0;
+  // Sets the current speaker volume, as a value between 0 and 255.
+  virtual bool SetOutputVolume(int level) = 0;
+
+  // Gets the current microphone level, as a value between 0 and 10.
+  virtual int GetInputLevel() = 0;
+
+  virtual const std::vector<AudioCodec>& audio_codecs() = 0;
+  virtual const std::vector<RtpHeaderExtension>&
+      audio_rtp_header_extensions() = 0;
+  virtual const std::vector<VideoCodec>& video_codecs() = 0;
+  virtual const std::vector<RtpHeaderExtension>&
+      video_rtp_header_extensions() = 0;
+
+  // Logging control
+  virtual void SetVoiceLogging(int min_sev, const char* filter) = 0;
+  virtual void SetVideoLogging(int min_sev, const char* filter) = 0;
+
+  // Starts AEC dump using existing file.
+  virtual bool StartAecDump(rtc::PlatformFile file) = 0;
+
+  // Stops recording AEC dump.
+  virtual void StopAecDump() = 0;
+
+  // Starts RtcEventLog using existing file.
+  virtual bool StartRtcEventLog(rtc::PlatformFile file) = 0;
+
+  // Stops recording an RtcEventLog.
+  virtual void StopRtcEventLog() = 0;
+};
+
+
+#if !defined(DISABLE_MEDIA_ENGINE_FACTORY)
+class MediaEngineFactory {
+ public:
+  typedef cricket::MediaEngineInterface* (*MediaEngineCreateFunction)();
+  // Creates a media engine, using either the compiled system default or the
+  // creation function specified in SetCreateFunction, if specified.
+  static MediaEngineInterface* Create();
+  // Sets the function used when calling Create. If unset, the compiled system
+  // default will be used. Returns the old create function, or NULL if one
+  // wasn't set. Likewise, NULL can be used as the |function| parameter to
+  // reset to the default behavior.
+  static MediaEngineCreateFunction SetCreateFunction(
+      MediaEngineCreateFunction function);
+ private:
+  static MediaEngineCreateFunction create_function_;
+};
+#endif
+
+// CompositeMediaEngine constructs a MediaEngine from separate
+// voice and video engine classes.
+template<class VOICE, class VIDEO>
+class CompositeMediaEngine : public MediaEngineInterface {
+ public:
+  virtual ~CompositeMediaEngine() {}
+  virtual bool Init(rtc::Thread* worker_thread) {
+    if (!voice_.Init(worker_thread))
+      return false;
+    video_.Init();
+    return true;
+  }
+  virtual void Terminate() {
+    voice_.Terminate();
+  }
+
+  virtual webrtc::VoiceEngine* GetVoE() {
+    return voice_.GetVoE();
+  }
+  virtual VoiceMediaChannel* CreateChannel(webrtc::Call* call,
+                                           const AudioOptions& options) {
+    return voice_.CreateChannel(call, options);
+  }
+  virtual VideoMediaChannel* CreateVideoChannel(webrtc::Call* call,
+                                                const VideoOptions& options) {
+    return video_.CreateChannel(call, options);
+  }
+
+  virtual AudioOptions GetAudioOptions() const {
+    return voice_.GetOptions();
+  }
+  virtual bool SetAudioOptions(const AudioOptions& options) {
+    return voice_.SetOptions(options);
+  }
+  virtual bool SetDefaultVideoEncoderConfig(const VideoEncoderConfig& config) {
+    return video_.SetDefaultEncoderConfig(config);
+  }
+
+  virtual bool SetSoundDevices(const Device* in_device,
+                               const Device* out_device) {
+    return voice_.SetDevices(in_device, out_device);
+  }
+
+  virtual bool GetOutputVolume(int* level) {
+    return voice_.GetOutputVolume(level);
+  }
+  virtual bool SetOutputVolume(int level) {
+    return voice_.SetOutputVolume(level);
+  }
+
+  virtual int GetInputLevel() {
+    return voice_.GetInputLevel();
+  }
+  virtual const std::vector<AudioCodec>& audio_codecs() {
+    return voice_.codecs();
+  }
+  virtual const std::vector<RtpHeaderExtension>& audio_rtp_header_extensions() {
+    return voice_.rtp_header_extensions();
+  }
+  virtual const std::vector<VideoCodec>& video_codecs() {
+    return video_.codecs();
+  }
+  virtual const std::vector<RtpHeaderExtension>& video_rtp_header_extensions() {
+    return video_.rtp_header_extensions();
+  }
+
+  virtual void SetVoiceLogging(int min_sev, const char* filter) {
+    voice_.SetLogging(min_sev, filter);
+  }
+  virtual void SetVideoLogging(int min_sev, const char* filter) {
+    video_.SetLogging(min_sev, filter);
+  }
+
+  virtual bool StartAecDump(rtc::PlatformFile file) {
+    return voice_.StartAecDump(file);
+  }
+
+  virtual void StopAecDump() {
+    voice_.StopAecDump();
+  }
+
+  virtual bool StartRtcEventLog(rtc::PlatformFile file) {
+    return voice_.StartRtcEventLog(file);
+  }
+
+  virtual void StopRtcEventLog() { voice_.StopRtcEventLog(); }
+
+ protected:
+  VOICE voice_;
+  VIDEO video_;
+};
+
+// NullVoiceEngine can be used with CompositeMediaEngine in the case where only
+// a video engine is desired.
+class NullVoiceEngine {
+ public:
+  bool Init(rtc::Thread* worker_thread) { return true; }
+  void Terminate() {}
+  // If you need this to return an actual channel, use FakeMediaEngine instead.
+  VoiceMediaChannel* CreateChannel(const AudioOptions& options) {
+    return nullptr;
+  }
+  AudioOptions GetOptions() const { return AudioOptions(); }
+  bool SetOptions(const AudioOptions& options) { return true; }
+  bool SetDevices(const Device* in_device, const Device* out_device) {
+    return true;
+  }
+  bool GetOutputVolume(int* level) {
+    *level = 0;
+    return true;
+  }
+  bool SetOutputVolume(int level) { return true; }
+  int GetInputLevel() { return 0; }
+  const std::vector<AudioCodec>& codecs() { return codecs_; }
+  const std::vector<RtpHeaderExtension>& rtp_header_extensions() {
+    return rtp_header_extensions_;
+  }
+  void SetLogging(int min_sev, const char* filter) {}
+  bool StartAecDump(rtc::PlatformFile file) { return false; }
+  bool StartRtcEventLog(rtc::PlatformFile file) { return false; }
+  void StopRtcEventLog() {}
+
+ private:
+  std::vector<AudioCodec> codecs_;
+  std::vector<RtpHeaderExtension> rtp_header_extensions_;
+};
+
+// NullVideoEngine can be used with CompositeMediaEngine in the case where only
+// a voice engine is desired.
+class NullVideoEngine {
+ public:
+  bool Init(rtc::Thread* worker_thread) { return true; }
+  void Terminate() {}
+  // If you need this to return an actual channel, use FakeMediaEngine instead.
+  VideoMediaChannel* CreateChannel(
+      const VideoOptions& options,
+      VoiceMediaChannel* voice_media_channel) {
+    return NULL;
+  }
+  bool SetOptions(const VideoOptions& options) { return true; }
+  bool SetDefaultEncoderConfig(const VideoEncoderConfig& config) {
+    return true;
+  }
+  const std::vector<VideoCodec>& codecs() { return codecs_; }
+  const std::vector<RtpHeaderExtension>& rtp_header_extensions() {
+    return rtp_header_extensions_;
+  }
+  void SetLogging(int min_sev, const char* filter) {}
+
+ private:
+  std::vector<VideoCodec> codecs_;
+  std::vector<RtpHeaderExtension> rtp_header_extensions_;
+};
+
+typedef CompositeMediaEngine<NullVoiceEngine, NullVideoEngine> NullMediaEngine;
+
+enum DataChannelType {
+  DCT_NONE = 0,
+  DCT_RTP = 1,
+  DCT_SCTP = 2
+};
+
+class DataEngineInterface {
+ public:
+  virtual ~DataEngineInterface() {}
+  virtual DataMediaChannel* CreateChannel(DataChannelType type) = 0;
+  virtual const std::vector<DataCodec>& data_codecs() = 0;
+};
+
+}  // namespace cricket
+
+#endif  // TALK_MEDIA_BASE_MEDIAENGINE_H_