/* * Copyright (C) 2012 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef ANDROID_AUDIO_FAST_MIXER_STATE_H #define ANDROID_AUDIO_FAST_MIXER_STATE_H #include #include #include #include namespace android { struct FastMixerDumpState; class VolumeProvider { public: // Return the track volume in U4_12 format: left in lower half, right in upper half. The // provider implementation is responsible for validating that the return value is in range. virtual uint32_t getVolumeLR() = 0; protected: VolumeProvider() { } virtual ~VolumeProvider() { } }; // Represents the state of a fast track struct FastTrack { FastTrack(); /*virtual*/ ~FastTrack(); ExtendedAudioBufferProvider* mBufferProvider; // must be NULL if inactive, or non-NULL if active VolumeProvider* mVolumeProvider; // optional; if NULL then full-scale audio_channel_mask_t mChannelMask; // AUDIO_CHANNEL_OUT_MONO or AUDIO_CHANNEL_OUT_STEREO int mGeneration; // increment when any field is assigned }; // Represents a single state of the fast mixer struct FastMixerState { FastMixerState(); /*virtual*/ ~FastMixerState(); static const unsigned kMaxFastTracks = 8; // must be between 2 and 32 inclusive // all pointer fields use raw pointers; objects are owned and ref-counted by the normal mixer FastTrack mFastTracks[kMaxFastTracks]; int mFastTracksGen; // increment when any mFastTracks[i].mGeneration is incremented unsigned mTrackMask; // bit i is set if and only if mFastTracks[i] is active NBAIO_Sink* mOutputSink; // HAL output device, must already be negotiated int mOutputSinkGen; // increment when mOutputSink is assigned size_t mFrameCount; // number of frames per fast mix buffer enum Command { INITIAL = 0, // used only for the initial state HOT_IDLE = 1, // do nothing COLD_IDLE = 2, // wait for the futex IDLE = 3, // either HOT_IDLE or COLD_IDLE EXIT = 4, // exit from thread // The following commands also process configuration changes, and can be "or"ed: MIX = 0x8, // mix tracks WRITE = 0x10, // write to output sink MIX_WRITE = 0x18, // mix tracks and write to output sink } mCommand; int32_t* mColdFutexAddr; // for COLD_IDLE only, pointer to the associated futex unsigned mColdGen; // increment when COLD_IDLE is requested so it's only performed once // This might be a one-time configuration rather than per-state FastMixerDumpState* mDumpState; // if non-NULL, then update dump state periodically NBAIO_Sink* mTeeSink; // if non-NULL, then duplicate write()s to this non-blocking sink NBLog::Writer* mNBLogWriter; // non-blocking logger }; // struct FastMixerState } // namespace android #endif // ANDROID_AUDIO_FAST_MIXER_STATE_H