Reland Use CopyOnWriteBuffer instead of Buffer to avoid unnecessary copies.

webrtc/media/base/fakemediaengine.h

 /*
  *  Copyright (c) 2004 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_MEDIA_BASE_FAKEMEDIAENGINE_H_
 #define WEBRTC_MEDIA_BASE_FAKEMEDIAENGINE_H_
 
 #include <list>
 #include <map>
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "webrtc/audio_sink.h"
-#include "webrtc/base/buffer.h"
+#include "webrtc/base/copyonwritebuffer.h"
 #include "webrtc/base/stringutils.h"
 #include "webrtc/media/base/audiosource.h"
 #include "webrtc/media/base/mediaengine.h"
 #include "webrtc/media/base/rtputils.h"
 #include "webrtc/media/base/streamparams.h"
 #include "webrtc/p2p/base/sessiondescription.h"
 
 namespace cricket {
 
 class FakeMediaEngine;
@@ skipping 18 matching lines @@
   }
   bool sending() const { return sending_; }
   bool playout() const { return playout_; }
   const std::list<std::string>& rtp_packets() const { return rtp_packets_; }
   const std::list<std::string>& rtcp_packets() const { return rtcp_packets_; }
 
   bool SendRtp(const void* data, int len, const rtc::PacketOptions& options) {
     if (!sending_) {
       return false;
     }
-    rtc::Buffer packet(reinterpret_cast<const uint8_t*>(data), len,
-                       kMaxRtpPacketLen);
+    rtc::CopyOnWriteBuffer packet(reinterpret_cast<const uint8_t*>(data), len,
+                                  kMaxRtpPacketLen);
     return Base::SendPacket(&packet, options);
   }
   bool SendRtcp(const void* data, int len) {
-    rtc::Buffer packet(reinterpret_cast<const uint8_t*>(data), len,
-                       kMaxRtpPacketLen);
+    rtc::CopyOnWriteBuffer packet(reinterpret_cast<const uint8_t*>(data), len,
+                                  kMaxRtpPacketLen);
     return Base::SendRtcp(&packet, rtc::PacketOptions());
   }
 
   bool CheckRtp(const void* data, int len) {
     bool success = !rtp_packets_.empty();
     if (success) {
       std::string packet = rtp_packets_.front();
       rtp_packets_.pop_front();
       success = (packet == std::string(static_cast<const char*>(data), len));
     }
@@ skipping 120 matching lines @@
   bool SetRecvRtpHeaderExtensions(
       const std::vector<RtpHeaderExtension>& extensions) {
     recv_extensions_ = extensions;
     return true;
   }
   bool SetSendRtpHeaderExtensions(
       const std::vector<RtpHeaderExtension>& extensions) {
     send_extensions_ = extensions;
     return true;
   }
-  virtual void OnPacketReceived(rtc::Buffer* packet,
+  virtual void OnPacketReceived(rtc::CopyOnWriteBuffer* packet,
                                 const rtc::PacketTime& packet_time) {
     rtp_packets_.push_back(std::string(packet->data<char>(), packet->size()));
   }
-  virtual void OnRtcpReceived(rtc::Buffer* packet,
+  virtual void OnRtcpReceived(rtc::CopyOnWriteBuffer* packet,
                               const rtc::PacketTime& packet_time) {
     rtcp_packets_.push_back(std::string(packet->data<char>(), packet->size()));
   }
   virtual void OnReadyToSend(bool ready) {
     ready_to_send_ = ready;
   }
   bool fail_set_send_codecs() const { return fail_set_send_codecs_; }
   bool fail_set_recv_codecs() const { return fail_set_recv_codecs_; }
 
  private:
@@ skipping 379 matching lines @@
       return false;
     return true;
   }
   virtual bool RemoveRecvStream(uint32_t ssrc) {
     if (!RtpHelper<DataMediaChannel>::RemoveRecvStream(ssrc))
       return false;
     return true;
   }
 
   virtual bool SendData(const SendDataParams& params,
-                        const rtc::Buffer& payload,
+                        const rtc::CopyOnWriteBuffer& payload,
                         SendDataResult* result) {
     if (send_blocked_) {
       *result = SDR_BLOCK;
       return false;
     } else {
       last_sent_data_params_ = params;
       last_sent_data_ = std::string(payload.data<char>(), payload.size());
       return true;
     }
   }
@@ skipping 269 matching lines @@
 
  private:
   std::vector<FakeDataMediaChannel*> channels_;
   std::vector<DataCodec> data_codecs_;
   DataChannelType last_channel_type_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_BASE_FAKEMEDIAENGINE_H_