1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_AUDIO_FAST_MIXER_STATE_H 18 #define ANDROID_AUDIO_FAST_MIXER_STATE_H 19 20 #include <math.h> 21 22 #include <audio_utils/minifloat.h> 23 #include <system/audio.h> 24 #include <media/AudioMixer.h> 25 #include <media/ExtendedAudioBufferProvider.h> 26 #include <media/nbaio/NBAIO.h> 27 #include <media/nblog/NBLog.h> 28 #include <vibrator/ExternalVibrationUtils.h> 29 #include "FastThreadState.h" 30 31 namespace android { 32 33 struct FastMixerDumpState; 34 35 class VolumeProvider { 36 public: 37 // The provider implementation is responsible for validating that the return value is in range. 38 virtual gain_minifloat_packed_t getVolumeLR() = 0; 39 protected: VolumeProvider()40 VolumeProvider() { } ~VolumeProvider()41 virtual ~VolumeProvider() { } 42 }; 43 44 // Represents the state of a fast track 45 struct FastTrack { 46 FastTrack(); 47 /*virtual*/ ~FastTrack(); 48 49 ExtendedAudioBufferProvider* mBufferProvider; // must be NULL if inactive, or non-NULL if active 50 VolumeProvider* mVolumeProvider; // optional; if NULL then full-scale 51 audio_channel_mask_t mChannelMask; // AUDIO_CHANNEL_OUT_MONO or AUDIO_CHANNEL_OUT_STEREO 52 audio_format_t mFormat; // track format 53 int mGeneration; // increment when any field is assigned 54 bool mHapticPlaybackEnabled = false; // haptic playback is enabled or not 55 os::HapticScale mHapticIntensity = os::HapticScale::MUTE; // intensity of haptic data 56 float mHapticMaxAmplitude = NAN; // max amplitude allowed for haptic data 57 }; 58 59 // Represents a single state of the fast mixer 60 struct FastMixerState : FastThreadState { 61 FastMixerState(); 62 /*virtual*/ ~FastMixerState(); 63 64 // These are the minimum, maximum, and default values for maximum number of fast tracks 65 static const unsigned kMinFastTracks = 2; 66 static const unsigned kMaxFastTracks = 32; 67 static const unsigned kDefaultFastTracks = 8; 68 69 static unsigned sMaxFastTracks; // Configured maximum number of fast tracks 70 static pthread_once_t sMaxFastTracksOnce; // Protects initializer for sMaxFastTracks 71 72 // all pointer fields use raw pointers; objects are owned and ref-counted by the normal mixer 73 FastTrack mFastTracks[kMaxFastTracks]; 74 int mFastTracksGen; // increment when any mFastTracks[i].mGeneration is incremented 75 unsigned mTrackMask; // bit i is set if and only if mFastTracks[i] is active 76 NBAIO_Sink* mOutputSink; // HAL output device, must already be negotiated 77 int mOutputSinkGen; // increment when mOutputSink is assigned 78 size_t mFrameCount; // number of frames per fast mix buffer 79 audio_channel_mask_t mSinkChannelMask; // If not AUDIO_CHANNEL_NONE, specifies sink channel 80 // mask when it cannot be directly calculated from 81 // channel count 82 83 // Extends FastThreadState::Command 84 static const Command 85 // The following commands also process configuration changes, and can be "or"ed: 86 MIX = 0x8, // mix tracks 87 WRITE = 0x10, // write to output sink 88 MIX_WRITE = 0x18; // mix tracks and write to output sink 89 90 // never returns NULL; asserts if command is invalid 91 static const char *commandToString(Command command); 92 93 // initialize sMaxFastTracks 94 static void sMaxFastTracksInit(); 95 96 }; // struct FastMixerState 97 98 } // namespace android 99 100 #endif // ANDROID_AUDIO_FAST_MIXER_STATE_H 101