audio: add settings to disable echo cancelling

In the audio settings, useEchoCanceller can be set to avoid
to use the integrated auto canceller

Change-Id: Iac4de7db1ee85fea001fb4aa3caf97caa9bc87df

src/media/audio/pulseaudio/pulselayer.cpp

@@ -336,7 +336,8 @@ void PulseLayer::createStreams(pa_context* c)
 
     // Create playback stream
     if (auto dev_infos = getDeviceInfos(sinkList_, getPreferredPlaybackDevice())) {
-        playback_.reset(new AudioStream(c, mainloop_.get(), "Playback", StreamType::Playback, audioFormat_.sample_rate, dev_infos, true, onReady));
+        bool ec = preference_.getEchoCanceller() == "system";
+        playback_.reset(new AudioStream(c, mainloop_.get(), "Playback", StreamType::Playback, audioFormat_.sample_rate, dev_infos, ec, onReady));
         pa_stream_set_write_callback(playback_->stream(), [](pa_stream * /*s*/, size_t /*bytes*/, void* userdata) {
             static_cast<PulseLayer*>(userdata)->writeToSpeaker();
         }, this);

src/preferences.cpp

@@ -123,6 +123,7 @@ static constexpr const char* RECORDPATH_KEY {"recordPath"};
 static constexpr const char* ALWAYS_RECORDING_KEY {"alwaysRecording"};
 static constexpr const char* VOLUMEMIC_KEY {"volumeMic"};
 static constexpr const char* VOLUMESPKR_KEY {"volumeSpkr"};
+static constexpr const char* ECHO_CANCELLER {"echoCanceller"};
 static constexpr const char* NOISE_REDUCE_KEY {"noiseReduce"};
 static constexpr const char* AGC_KEY {"automaticGainControl"};
 static constexpr const char* CAPTURE_MUTED_KEY {"captureMuted"};
@@ -341,6 +342,7 @@ AudioPreference::AudioPreference() :
     , alwaysRecording_(false)
     , volumemic_(1.0)
     , volumespkr_(1.0)
+    , echoCanceller_("system")
     , denoise_(false)
     , agcEnabled_(false)
     , captureMuted_(false)
@@ -494,7 +496,7 @@ void AudioPreference::serialize(YAML::Emitter &out) const
     out << YAML::Key << RECORDPATH_KEY << YAML::Value << recordpath_;
     out << YAML::Key << VOLUMEMIC_KEY << YAML::Value << volumemic_;
     out << YAML::Key << VOLUMESPKR_KEY << YAML::Value << volumespkr_;
-
+    out << YAML::Key << ECHO_CANCELLER << YAML::Value << echoCanceller_;
     out << YAML::EndMap;
 }
 
@@ -542,6 +544,7 @@ void AudioPreference::unserialize(const YAML::Node &in)
     parseValue(node, RECORDPATH_KEY, recordpath_);
     parseValue(node, VOLUMEMIC_KEY, volumemic_);
     parseValue(node, VOLUMESPKR_KEY, volumespkr_);
+    parseValue(node, ECHO_CANCELLER, echoCanceller_);
 }
 
 ShortcutPreferences::ShortcutPreferences() : hangup_(), pickup_(), popup_(),

src/preferences.h

@@ -9,7 +9,7 @@
  *  the Free Software Foundation; either version 3 of the License, or
  *  (at your option) any later version.
  *
- *  This program is distributed in the hope that it will be useful,
+ *  This program is distributed in the hope that it will be ful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
@@ -376,6 +376,14 @@ class AudioPreference : public Serializable {
             playbackMuted_= muted;
         }
 
+        std::string getEchoCanceller() const {
+            return echoCanceller_;
+        }
+
+        void setEchoCanceller(const std::string& ec) {
+            echoCanceller_ = ec;
+        }
+
     private:
         std::string audioApi_;
 
@@ -396,6 +404,7 @@ class AudioPreference : public Serializable {
         bool alwaysRecording_;
         double volumemic_;
         double volumespkr_;
+        std::string echoCanceller_;
 
         bool denoise_;
         bool agcEnabled_;