diff options
Diffstat (limited to 'include/hardware_legacy/AudioPolicyManagerBase.h')
| -rw-r--r-- | include/hardware_legacy/AudioPolicyManagerBase.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/hardware_legacy/AudioPolicyManagerBase.h b/include/hardware_legacy/AudioPolicyManagerBase.h index 815ab2e..7eb1c25 100644 --- a/include/hardware_legacy/AudioPolicyManagerBase.h +++ b/include/hardware_legacy/AudioPolicyManagerBase.h @@ -41,6 +41,8 @@ namespace android { #define NUM_TEST_OUTPUTS 5 +#define NUM_VOL_CURVE_KNEES 2 + // ---------------------------------------------------------------------------- // AudioPolicyManagerBase implements audio policy manager behavior common to all platforms. // Each platform must implement an AudioPolicyManager class derived from AudioPolicyManagerBase @@ -188,6 +190,15 @@ protected: int mIndexMax; // max volume index int mIndexCur; // current volume index bool mCanBeMuted; // true is the stream can be muted + + // 4 points to define the volume attenuation curve, each characterized by the volume + // index (from 0 to 100) at which they apply, and the attenuation in dB at that index. + int mVolIndex[NUM_VOL_CURVE_KNEES+2]; // minimum index, index at knees, and max index + float mVolDbAtt[NUM_VOL_CURVE_KNEES+2]; // largest attenuation, attenuation at knees, + // and attenuation at max vol (usually 0dB) + // indices in mVolIndex and mVolDbAtt respectively for points at lowest volume, knee 1, + // knee 2 and highest volume. + enum { VOLMIN = 0, VOLKNEE1 = 1, VOLKNEE2 = 2, VOLMAX = 3 }; }; // stream descriptor used for volume control @@ -224,6 +235,7 @@ protected: virtual uint32_t getDeviceForInputSource(int inputSource); // return io handle of active input or 0 if no input is active audio_io_handle_t getActiveInput(); + virtual void initializeVolumeCurves(); // compute the actual volume for a given stream according to the requested index and a particular // device virtual float computeVolume(int stream, int index, audio_io_handle_t output, uint32_t device); @@ -334,6 +346,10 @@ protected: uint32_t mTestChannels; uint32_t mTestLatencyMs; #endif //AUDIO_POLICY_TEST + +private: + static float volIndexToAmpl(uint32_t device, const StreamDescriptor& streamDesc, + int indexInUi); }; }; |