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 27namespace android { 28 29struct FastMixerDumpState; 30 31class VolumeProvider { 32public: 33 // The provider implementation is responsible for validating that the return value is in range. 34 virtual gain_minifloat_packed_t getVolumeLR() = 0; 35protected: 36 VolumeProvider() { } 37 virtual ~VolumeProvider() { } 38}; 39 40// Represents the state of a fast track 41struct 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 53struct FastMixerState : FastThreadState { 54 FastMixerState(); 55 /*virtual*/ ~FastMixerState(); 56 57 static const unsigned kMaxFastTracks = 8; // must be between 2 and 32 inclusive 58 59 // all pointer fields use raw pointers; objects are owned and ref-counted by the normal mixer 60 FastTrack mFastTracks[kMaxFastTracks]; 61 int mFastTracksGen; // increment when any mFastTracks[i].mGeneration is incremented 62 unsigned mTrackMask; // bit i is set if and only if mFastTracks[i] is active 63 NBAIO_Sink* mOutputSink; // HAL output device, must already be negotiated 64 int mOutputSinkGen; // increment when mOutputSink is assigned 65 size_t mFrameCount; // number of frames per fast mix buffer 66 67 // Extends FastThreadState::Command 68 static const Command 69 // The following commands also process configuration changes, and can be "or"ed: 70 MIX = 0x8, // mix tracks 71 WRITE = 0x10, // write to output sink 72 MIX_WRITE = 0x18; // mix tracks and write to output sink 73 74 // This might be a one-time configuration rather than per-state 75 NBAIO_Sink* mTeeSink; // if non-NULL, then duplicate write()s to this non-blocking sink 76}; // struct FastMixerState 77 78} // namespace android 79 80#endif // ANDROID_AUDIO_FAST_MIXER_STATE_H 81