AudioMixer.h revision 9c56d4ae6212c21ce5fd71ed534eb195983a07c1
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 names (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 // For all APIs with "name": TRACK0 <= name < TRACK0 + MAX_NUM_TRACKS 78 int getTrackName(); 79 void deleteTrackName(int name); 80 81 void enable(int name); 82 void disable(int name); 83 84 void setParameter(int name, int target, int param, void *value); 85 86 void setBufferProvider(int name, AudioBufferProvider* bufferProvider); 87 void process(); 88 89 uint32_t trackNames() const { return mTrackNames; } 90 91private: 92 93 enum { 94 NEEDS_CHANNEL_COUNT__MASK = 0x00000003, 95 NEEDS_FORMAT__MASK = 0x000000F0, 96 NEEDS_MUTE__MASK = 0x00000100, 97 NEEDS_RESAMPLE__MASK = 0x00001000, 98 NEEDS_AUX__MASK = 0x00010000, 99 }; 100 101 enum { 102 NEEDS_CHANNEL_1 = 0x00000000, 103 NEEDS_CHANNEL_2 = 0x00000001, 104 105 NEEDS_FORMAT_16 = 0x00000010, 106 107 NEEDS_MUTE_DISABLED = 0x00000000, 108 NEEDS_MUTE_ENABLED = 0x00000100, 109 110 NEEDS_RESAMPLE_DISABLED = 0x00000000, 111 NEEDS_RESAMPLE_ENABLED = 0x00001000, 112 113 NEEDS_AUX_DISABLED = 0x00000000, 114 NEEDS_AUX_ENABLED = 0x00010000, 115 }; 116 117 static inline int32_t applyVolume(int32_t in, int32_t v) { 118 return in * v; 119 } 120 121 122 struct state_t; 123 struct track_t; 124 125 typedef void (*mix_t)(state_t* state); 126 typedef void (*hook_t)(track_t* t, int32_t* output, size_t numOutFrames, int32_t* temp, int32_t* aux); 127 static const int BLOCKSIZE = 16; // 4 cache lines 128 129 struct track_t { 130 uint32_t needs; 131 132 union { 133 int16_t volume[MAX_NUM_CHANNELS]; // [0]3.12 fixed point 134 int32_t volumeRL; 135 }; 136 137 int32_t prevVolume[MAX_NUM_CHANNELS]; 138 139 int32_t volumeInc[MAX_NUM_CHANNELS]; 140 int32_t auxLevel; 141 int32_t auxInc; 142 int32_t prevAuxLevel; 143 144 uint16_t frameCount; 145 146 uint8_t channelCount : 4; 147 uint8_t enabled : 1; 148 uint8_t reserved0 : 3; 149 uint8_t format; 150 uint32_t channelMask; 151 152 AudioBufferProvider* bufferProvider; 153 mutable AudioBufferProvider::Buffer buffer; 154 155 hook_t hook; 156 void const* in; // current location in buffer 157 158 AudioResampler* resampler; 159 uint32_t sampleRate; 160 int32_t* mainBuffer; 161 int32_t* auxBuffer; 162 163 bool setResampler(uint32_t sampleRate, uint32_t devSampleRate); 164 bool doesResample() const; 165 void resetResampler(); 166 void adjustVolumeRamp(bool aux); 167 }; 168 169 // pad to 32-bytes to fill cache line 170 struct state_t { 171 uint32_t enabledTracks; 172 uint32_t needsChanged; 173 size_t frameCount; 174 mix_t hook; 175 int32_t *outputTemp; 176 int32_t *resampleTemp; 177 int32_t reserved[2]; 178 track_t tracks[MAX_NUM_TRACKS]; __attribute__((aligned(32))); 179 }; 180 181 // bitmask of allocated track names, where bit 0 corresponds to TRACK0 etc. 182 uint32_t mTrackNames; 183 const uint32_t mSampleRate; 184 185 state_t mState __attribute__((aligned(32))); 186 187 void invalidateState(uint32_t mask); 188 189 static void track__genericResample(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 190 static void track__nop(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 191 static void track__16BitsStereo(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 192 static void track__16BitsMono(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 193 static void volumeRampStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, int32_t* aux); 194 static void volumeStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, int32_t* aux); 195 196 static void process__validate(state_t* state); 197 static void process__nop(state_t* state); 198 static void process__genericNoResampling(state_t* state); 199 static void process__genericResampling(state_t* state); 200 static void process__OneTrack16BitsStereoNoResampling(state_t* state); 201 static void process__TwoTracks16BitsStereoNoResampling(state_t* state); 202}; 203 204// ---------------------------------------------------------------------------- 205}; // namespace android 206 207#endif // ANDROID_AUDIO_MIXER_H 208