[Chromecast] Implement new volume control API

chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.h

Index: chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.h
diff --git a/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.h b/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.h
index 2ff54a859e117e942261b598c6f75c491587ece7..73186b03df2f7024c06264f4926998fefe192d59 100644
--- a/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.h
+++ b/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.h
@@ -18,6 +18,7 @@
 #include "chromecast/media/cma/backend/alsa/slew_volume.h"
 #include "chromecast/media/cma/backend/alsa/stream_mixer_alsa.h"
 #include "chromecast/media/cma/backend/alsa/stream_mixer_alsa_input.h"
+#include "chromecast/public/volume_control.h"
 
 namespace base {
 class SingleThreadTaskRunner;
@@ -94,6 +95,7 @@ class StreamMixerAlsaInputImpl : public StreamMixerAlsa::InputQueue {
                            int input_samples_per_second,
                            bool primary,
                            const std::string& device_id,
+                           AudioContentType content_type,
                            StreamMixerAlsa* mixer);
 
   ~StreamMixerAlsaInputImpl() override;
@@ -120,6 +122,7 @@ class StreamMixerAlsaInputImpl : public StreamMixerAlsa::InputQueue {
   int input_samples_per_second() const override;
   bool primary() const override;
   std::string device_id() const override;
+  AudioContentType content_type() const override;
   bool IsDeleting() const override;
   void Initialize(const MediaPipelineBackendAlsa::RenderingDelay&
                       mixer_rendering_delay) override;
@@ -136,6 +139,8 @@ class StreamMixerAlsaInputImpl : public StreamMixerAlsa::InputQueue {
                             mixer_rendering_delay) override;
   void SignalError(StreamMixerAlsaInput::MixerError error) override;
   void PrepareToDelete(const OnReadyToDeleteCb& delete_cb) override;
+  void SetContentTypeVolume(float volume) override;
+  void SetMuted(bool muted) override;
 
   // Tells the mixer to delete |this|. Makes sure not to call |delete_cb_| more
   // than once for |this|.
@@ -154,7 +159,8 @@ class StreamMixerAlsaInputImpl : public StreamMixerAlsa::InputQueue {
   StreamMixerAlsaInput::Delegate* const delegate_;
   const int input_samples_per_second_;
   const bool primary_;
-  std::string device_id_;
+  const std::string device_id_;
+  const AudioContentType content_type_;
   StreamMixerAlsa* const mixer_;
   FilterGroup* filter_group_;
   const scoped_refptr<base::SingleThreadTaskRunner> mixer_task_runner_;
@@ -163,6 +169,10 @@ class StreamMixerAlsaInputImpl : public StreamMixerAlsa::InputQueue {
   double resample_ratio_;
 
   State state_;
+
+  float stream_volume_multiplier_;
+  float type_volume_multiplier_;
+  float mute_volume_multiplier_;
   SlewVolume slew_volume_;
 
   base::Lock queue_lock_;  // Lock for the following queue-related members.