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/ExtendedAudioBufferProvider.h> 23 #include <media/nbaio/NBAIO.h> 24 #include <media/nbaio/NBLog.h> 25 #include "FastThreadState.h" 26 27 namespace android { 28 29 struct FastMixerDumpState; 30 31 class VolumeProvider { 32 public: 33 // The provider implementation is responsible for validating that the return value is in range. 34 virtual gain_minifloat_packed_t getVolumeLR() = 0; 35 protected: VolumeProvider()36 VolumeProvider() { } ~VolumeProvider()37 virtual ~VolumeProvider() { } 38 }; 39 40 // Represents the state of a fast track 41 struct FastTrack { 42 FastTrack(); 43 /*virtual*/ ~FastTrack(); 44 45 ExtendedAudioBufferProvider* mBufferProvider; // must be NULL if inactive, or non-NULL if active 46 VolumeProvider* mVolumeProvider; // optional; if NULL then full-scale 47 audio_channel_mask_t mChannelMask; // AUDIO_CHANNEL_OUT_MONO or AUDIO_CHANNEL_OUT_STEREO 48 audio_format_t mFormat; // track format 49 int mGeneration; // increment when any field is assigned 50 }; 51 52 // Represents a single state of the fast mixer 53 struct FastMixerState : FastThreadState { 54 FastMixerState(); 55 /*virtual*/ ~FastMixerState(); 56 57 // These are the minimum, maximum, and default values for maximum number of fast tracks 58 static const unsigned kMinFastTracks = 2; 59 static const unsigned kMaxFastTracks = 32; 60 static const unsigned kDefaultFastTracks = 8; 61 62 static unsigned sMaxFastTracks; // Configured maximum number of fast tracks 63 static pthread_once_t sMaxFastTracksOnce; // Protects initializer for sMaxFastTracks 64 65 // all pointer fields use raw pointers; objects are owned and ref-counted by the normal mixer 66 FastTrack mFastTracks[kMaxFastTracks]; 67 int mFastTracksGen; // increment when any mFastTracks[i].mGeneration is incremented 68 unsigned mTrackMask; // bit i is set if and only if mFastTracks[i] is active 69 NBAIO_Sink* mOutputSink; // HAL output device, must already be negotiated 70 int mOutputSinkGen; // increment when mOutputSink is assigned 71 size_t mFrameCount; // number of frames per fast mix buffer 72 73 // Extends FastThreadState::Command 74 static const Command 75 // The following commands also process configuration changes, and can be "or"ed: 76 MIX = 0x8, // mix tracks 77 WRITE = 0x10, // write to output sink 78 MIX_WRITE = 0x18; // mix tracks and write to output sink 79 80 // This might be a one-time configuration rather than per-state 81 NBAIO_Sink* mTeeSink; // if non-NULL, then duplicate write()s to this non-blocking sink 82 83 // never returns NULL; asserts if command is invalid 84 static const char *commandToString(Command command); 85 86 // initialize sMaxFastTracks 87 static void sMaxFastTracksInit(); 88 89 }; // struct FastMixerState 90 91 } // namespace android 92 93 #endif // ANDROID_AUDIO_FAST_MIXER_STATE_H 94