AudioMixer.h revision 7ab41c9f773ba599646f1b0d00955c1be80f92fd
1/* //device/include/server/AudioFlinger/AudioMixer.h 2** 3** Copyright 2007, The Android Open Source Project 4** 5** Licensed under the Apache License, Version 2.0 (the "License"); 6** you may not use this file except in compliance with the License. 7** You may obtain a copy of the License at 8** 9** http://www.apache.org/licenses/LICENSE-2.0 10** 11** Unless required by applicable law or agreed to in writing, software 12** distributed under the License is distributed on an "AS IS" BASIS, 13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14** See the License for the specific language governing permissions and 15** limitations under the License. 16*/ 17 18#ifndef ANDROID_AUDIO_MIXER_H 19#define ANDROID_AUDIO_MIXER_H 20 21#include <stdint.h> 22#include <sys/types.h> 23 24#include "AudioBufferProvider.h" 25#include "AudioResampler.h" 26 27namespace android { 28 29// ---------------------------------------------------------------------------- 30 31#define LIKELY( exp ) (__builtin_expect( (exp) != 0, true )) 32#define UNLIKELY( exp ) (__builtin_expect( (exp) != 0, false )) 33 34// ---------------------------------------------------------------------------- 35 36class AudioMixer 37{ 38public: 39 AudioMixer(size_t frameCount, uint32_t sampleRate); 40 41 ~AudioMixer(); 42 43 static const uint32_t MAX_NUM_TRACKS = 32; 44 static const uint32_t MAX_NUM_CHANNELS = 2; 45 46 static const uint16_t UNITY_GAIN = 0x1000; 47 48 enum { // names 49 50 // track units (MAX_NUM_TRACKS units) 51 TRACK0 = 0x1000, 52 53 // 0x2000 is unused 54 55 // setParameter targets 56 TRACK = 0x3000, 57 RESAMPLE = 0x3001, 58 RAMP_VOLUME = 0x3002, // ramp to new volume 59 VOLUME = 0x3003, // don't ramp 60 61 // set Parameter names 62 // for target TRACK 63 CHANNEL_MASK = 0x4000, 64 FORMAT = 0x4001, 65 MAIN_BUFFER = 0x4002, 66 AUX_BUFFER = 0x4003, 67 // for target RESAMPLE 68 SAMPLE_RATE = 0x4100, 69 RESET = 0x4101, 70 // for target RAMP_VOLUME and VOLUME (8 channels max) 71 VOLUME0 = 0x4200, 72 VOLUME1 = 0x4201, 73 AUXLEVEL = 0x4210, 74 }; 75 76 77 int getTrackName(); 78 void deleteTrackName(int name); 79 80 void enable(); 81 void disable(); 82 83 void setActiveTrack(int track); 84 void setParameter(int target, int name, void *value); 85 86 void setBufferProvider(AudioBufferProvider* bufferProvider); 87 void process(); 88 89 uint32_t trackNames() const { return mTrackNames; } 90 91 size_t getUnreleasedFrames(int name); 92 93private: 94 95 enum { 96 NEEDS_CHANNEL_COUNT__MASK = 0x00000003, 97 NEEDS_FORMAT__MASK = 0x000000F0, 98 NEEDS_MUTE__MASK = 0x00000100, 99 NEEDS_RESAMPLE__MASK = 0x00001000, 100 NEEDS_AUX__MASK = 0x00010000, 101 }; 102 103 enum { 104 NEEDS_CHANNEL_1 = 0x00000000, 105 NEEDS_CHANNEL_2 = 0x00000001, 106 107 NEEDS_FORMAT_16 = 0x00000010, 108 109 NEEDS_MUTE_DISABLED = 0x00000000, 110 NEEDS_MUTE_ENABLED = 0x00000100, 111 112 NEEDS_RESAMPLE_DISABLED = 0x00000000, 113 NEEDS_RESAMPLE_ENABLED = 0x00001000, 114 115 NEEDS_AUX_DISABLED = 0x00000000, 116 NEEDS_AUX_ENABLED = 0x00010000, 117 }; 118 119 struct state_t; 120 struct track_t; 121 122 typedef void (*mix_t)(state_t* state); 123 typedef void (*hook_t)(track_t* t, int32_t* output, size_t numOutFrames, int32_t* temp, int32_t* aux); 124 static const int BLOCKSIZE = 16; // 4 cache lines 125 126 struct track_t { 127 uint32_t needs; 128 129 union { 130 int16_t volume[MAX_NUM_CHANNELS]; // [0]3.12 fixed point 131 int32_t volumeRL; 132 }; 133 134 int32_t prevVolume[MAX_NUM_CHANNELS]; 135 136 int32_t volumeInc[MAX_NUM_CHANNELS]; 137 int32_t auxLevel; 138 int32_t auxInc; 139 int32_t prevAuxLevel; 140 141 uint16_t frameCount; 142 143 uint8_t channelCount : 4; 144 uint8_t enabled : 1; 145 uint8_t reserved0 : 3; 146 uint8_t format; 147 uint32_t channelMask; 148 149 AudioBufferProvider* bufferProvider; 150 mutable AudioBufferProvider::Buffer buffer; 151 152 hook_t hook; 153 void const* in; // current location in buffer 154 155 AudioResampler* resampler; 156 uint32_t sampleRate; 157 int32_t* mainBuffer; 158 int32_t* auxBuffer; 159 160 bool setResampler(uint32_t sampleRate, uint32_t devSampleRate); 161 bool doesResample() const; 162 void resetResampler(); 163 void adjustVolumeRamp(bool aux); 164 size_t getUnreleasedFrames(); 165 }; 166 167 // pad to 32-bytes to fill cache line 168 struct state_t { 169 uint32_t enabledTracks; 170 uint32_t needsChanged; 171 size_t frameCount; 172 mix_t hook; 173 int32_t *outputTemp; 174 int32_t *resampleTemp; 175 int32_t reserved[2]; 176 track_t tracks[MAX_NUM_TRACKS]; __attribute__((aligned(32))); 177 }; 178 179 int mActiveTrack; 180 uint32_t mTrackNames; 181 const uint32_t mSampleRate; 182 183 state_t mState __attribute__((aligned(32))); 184 185 void invalidateState(uint32_t mask); 186 187 static void track__genericResample(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 188 static void track__nop(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 189 static void track__16BitsStereo(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 190 static void track__16BitsMono(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 191 static void volumeRampStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, int32_t* aux); 192 static void volumeStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, int32_t* aux); 193 194 static void process__validate(state_t* state); 195 static void process__nop(state_t* state); 196 static void process__genericNoResampling(state_t* state); 197 static void process__genericResampling(state_t* state); 198 static void process__OneTrack16BitsStereoNoResampling(state_t* state); 199#if 0 200 static void process__TwoTracks16BitsStereoNoResampling(state_t* state); 201#endif 202}; 203 204// ---------------------------------------------------------------------------- 205}; // namespace android 206 207#endif // ANDROID_AUDIO_MIXER_H 208