Add a bridge implementation of get_master_volume.

Add an implementation of the new get_master_volume method to bridge from the new
C only audio HAL to the old C++ legacy audio HAL.

Change-Id: I5c29814623b5141b0c69927ea60be9873c8a5dab

2 files changed, 9 insertions, 0 deletions

diff --git a/include/hardware_legacy/AudioHardwareBase.h b/include/hardware_legacy/AudioHardwareBase.h
index 3dec357..eac40dc 100644
--- a/include/hardware_legacy/AudioHardwareBase.h
+++ b/include/hardware_legacy/AudioHardwareBase.h
@@ -46,6 +46,7 @@ public:
     virtual String8     getParameters(const String8& keys);
 
     virtual  size_t     getInputBufferSize(uint32_t sampleRate, int format, int channelCount);
+    virtual status_t    getMasterVolume(float *volume);
 
     /**This method dumps the state of the audio hardware */
     virtual status_t dumpState(int fd, const Vector<String16>& args);
diff --git a/include/hardware_legacy/AudioHardwareInterface.h b/include/hardware_legacy/AudioHardwareInterface.h
index 847fe6b..425b0a5 100644
--- a/include/hardware_legacy/AudioHardwareInterface.h
+++ b/include/hardware_legacy/AudioHardwareInterface.h
@@ -210,6 +210,14 @@ public:
     virtual status_t    setMasterVolume(float volume) = 0;
 
     /**
+     * Get the current master volume value for the HAL, if the HAL supports
+     * master volume control.  AudioFlinger will query this value from the
+     * primary audio HAL when the service starts and use the value for setting
+     * the initial master volume across all HALs.
+     */
+    virtual status_t    getMasterVolume(float *volume) = 0;
+
+    /**
      * setMode is called when the audio mode changes. NORMAL mode is for
      * standard audio playback, RINGTONE when a ringtone is playing, and IN_CALL
      * when a call is in progress.