AudioMixer.h revision 6d4bf6eda04888144ec59cba4816a2cbb79b9e5c
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 (32 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 status_t 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 static void ditherAndClamp(int32_t* out, int32_t const *sums, size_t c); 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 static inline int32_t applyVolume(int32_t in, int32_t v) { 120 return in * v; 121 } 122 123 124 struct state_t; 125 struct track_t; 126 127 typedef void (*mix_t)(state_t* state); 128 typedef void (*hook_t)(track_t* t, int32_t* output, size_t numOutFrames, int32_t* temp, int32_t* aux); 129 static const int BLOCKSIZE = 16; // 4 cache lines 130 131 struct track_t { 132 uint32_t needs; 133 134 union { 135 int16_t volume[2]; // [0]3.12 fixed point 136 int32_t volumeRL; 137 }; 138 139 int32_t prevVolume[2]; 140 141 int32_t volumeInc[2]; 142 int32_t auxLevel; 143 int32_t auxInc; 144 int32_t prevAuxLevel; 145 146 uint16_t frameCount; 147 148 uint8_t channelCount : 4; 149 uint8_t enabled : 1; 150 uint8_t reserved0 : 3; 151 uint8_t format; 152 uint32_t channelMask; 153 154 AudioBufferProvider* bufferProvider; 155 mutable AudioBufferProvider::Buffer buffer; 156 157 hook_t hook; 158 void const* in; // current location in buffer 159 160 AudioResampler* resampler; 161 uint32_t sampleRate; 162 int32_t* mainBuffer; 163 int32_t* auxBuffer; 164 165 bool setResampler(uint32_t sampleRate, uint32_t devSampleRate); 166 bool doesResample() const; 167 void resetResampler(); 168 void adjustVolumeRamp(bool aux); 169 }; 170 171 // pad to 32-bytes to fill cache line 172 struct state_t { 173 uint32_t enabledTracks; 174 uint32_t needsChanged; 175 size_t frameCount; 176 mix_t hook; 177 int32_t *outputTemp; 178 int32_t *resampleTemp; 179 int32_t reserved[2]; 180 track_t tracks[32]; __attribute__((aligned(32))); 181 }; 182 183 int mActiveTrack; 184 uint32_t mTrackNames; 185 const uint32_t mSampleRate; 186 187 state_t mState __attribute__((aligned(32))); 188 189 void invalidateState(uint32_t mask); 190 191 static void track__genericResample(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 192 static void track__nop(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 193 static void track__16BitsStereo(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 194 static void track__16BitsMono(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 195 static void volumeRampStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, int32_t* aux); 196 static void volumeStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, int32_t* aux); 197 198 static void process__validate(state_t* state); 199 static void process__nop(state_t* state); 200 static void process__genericNoResampling(state_t* state); 201 static void process__genericResampling(state_t* state); 202 static void process__OneTrack16BitsStereoNoResampling(state_t* state); 203 static void process__TwoTracks16BitsStereoNoResampling(state_t* state); 204}; 205 206// ---------------------------------------------------------------------------- 207}; // namespace android 208 209#endif // ANDROID_AUDIO_MIXER_H 210