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 <audio_utils/minifloat.h> 21 #include <system/audio.h> 22 #include <media/AudioMixer.h> 23 #include <media/ExtendedAudioBufferProvider.h> 24 #include <media/nbaio/NBAIO.h> 25 #include <media/nblog/NBLog.h> 26 #include "FastThreadState.h" 27 28 namespace android { 29 30 struct FastMixerDumpState; 31 32 class VolumeProvider { 33 public: 34 // The provider implementation is responsible for validating that the return value is in range. 35 virtual gain_minifloat_packed_t getVolumeLR() = 0; 36 protected: VolumeProvider()37 VolumeProvider() { } ~VolumeProvider()38 virtual ~VolumeProvider() { } 39 }; 40 41 // Represents the state of a fast track 42 struct FastTrack { 43 FastTrack(); 44 /*virtual*/ ~FastTrack(); 45 46 ExtendedAudioBufferProvider* mBufferProvider; // must be NULL if inactive, or non-NULL if active 47 VolumeProvider* mVolumeProvider; // optional; if NULL then full-scale 48 audio_channel_mask_t mChannelMask; // AUDIO_CHANNEL_OUT_MONO or AUDIO_CHANNEL_OUT_STEREO 49 audio_format_t mFormat; // track format 50 int mGeneration; // increment when any field is assigned 51 bool mHapticPlaybackEnabled = false; // haptic playback is enabled or not 52 AudioMixer::haptic_intensity_t mHapticIntensity = AudioMixer::HAPTIC_SCALE_MUTE; // intensity of 53 // haptic data 54 }; 55 56 // Represents a single state of the fast mixer 57 struct FastMixerState : FastThreadState { 58 FastMixerState(); 59 /*virtual*/ ~FastMixerState(); 60 61 // These are the minimum, maximum, and default values for maximum number of fast tracks 62 static const unsigned kMinFastTracks = 2; 63 static const unsigned kMaxFastTracks = 32; 64 static const unsigned kDefaultFastTracks = 8; 65 66 static unsigned sMaxFastTracks; // Configured maximum number of fast tracks 67 static pthread_once_t sMaxFastTracksOnce; // Protects initializer for sMaxFastTracks 68 69 // all pointer fields use raw pointers; objects are owned and ref-counted by the normal mixer 70 FastTrack mFastTracks[kMaxFastTracks]; 71 int mFastTracksGen; // increment when any mFastTracks[i].mGeneration is incremented 72 unsigned mTrackMask; // bit i is set if and only if mFastTracks[i] is active 73 NBAIO_Sink* mOutputSink; // HAL output device, must already be negotiated 74 int mOutputSinkGen; // increment when mOutputSink is assigned 75 size_t mFrameCount; // number of frames per fast mix buffer 76 audio_channel_mask_t mSinkChannelMask; // If not AUDIO_CHANNEL_NONE, specifies sink channel 77 // mask when it cannot be directly calculated from 78 // channel count 79 80 // Extends FastThreadState::Command 81 static const Command 82 // The following commands also process configuration changes, and can be "or"ed: 83 MIX = 0x8, // mix tracks 84 WRITE = 0x10, // write to output sink 85 MIX_WRITE = 0x18; // mix tracks and write to output sink 86 87 // never returns NULL; asserts if command is invalid 88 static const char *commandToString(Command command); 89 90 // initialize sMaxFastTracks 91 static void sMaxFastTracksInit(); 92 93 }; // struct FastMixerState 94 95 } // namespace android 96 97 #endif // ANDROID_AUDIO_FAST_MIXER_STATE_H 98