AudioMixer.h revision 81a028fef62bcadf13fc8550067a3d29c918b3ca
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 // enable/disable 54 MIXING = 0x2000, 55 56 // setParameter targets 57 TRACK = 0x3000, 58 RESAMPLE = 0x3001, 59 RAMP_VOLUME = 0x3002, // ramp to new volume 60 VOLUME = 0x3003, // don't ramp 61 62 // set Parameter names 63 // for target TRACK 64 CHANNEL_MASK = 0x4000, 65 FORMAT = 0x4001, 66 MAIN_BUFFER = 0x4002, 67 AUX_BUFFER = 0x4003, 68 // for TARGET RESAMPLE 69 SAMPLE_RATE = 0x4100, 70 RESET = 0x4101, 71 // for TARGET VOLUME (8 channels max) 72 VOLUME0 = 0x4200, 73 VOLUME1 = 0x4201, 74 AUXLEVEL = 0x4210, 75 }; 76 77 78 int getTrackName(); 79 void deleteTrackName(int name); 80 81 status_t enable(int name); 82 status_t disable(int name); 83 84 status_t setActiveTrack(int track); 85 status_t setParameter(int target, int name, void *value); 86 87 status_t setBufferProvider(AudioBufferProvider* bufferProvider); 88 void process(); 89 90 uint32_t trackNames() const { return mTrackNames; } 91 92 static void ditherAndClamp(int32_t* out, int32_t const *sums, size_t c); 93 94private: 95 96 enum { 97 NEEDS_CHANNEL_COUNT__MASK = 0x00000003, 98 NEEDS_FORMAT__MASK = 0x000000F0, 99 NEEDS_MUTE__MASK = 0x00000100, 100 NEEDS_RESAMPLE__MASK = 0x00001000, 101 NEEDS_AUX__MASK = 0x00010000, 102 }; 103 104 enum { 105 NEEDS_CHANNEL_1 = 0x00000000, 106 NEEDS_CHANNEL_2 = 0x00000001, 107 108 NEEDS_FORMAT_16 = 0x00000010, 109 110 NEEDS_MUTE_DISABLED = 0x00000000, 111 NEEDS_MUTE_ENABLED = 0x00000100, 112 113 NEEDS_RESAMPLE_DISABLED = 0x00000000, 114 NEEDS_RESAMPLE_ENABLED = 0x00001000, 115 116 NEEDS_AUX_DISABLED = 0x00000000, 117 NEEDS_AUX_ENABLED = 0x00010000, 118 }; 119 120 struct state_t; 121 struct track_t; 122 123 typedef void (*mix_t)(state_t* state); 124 typedef void (*hook_t)(track_t* t, int32_t* output, size_t numOutFrames, int32_t* temp, int32_t* aux); 125 static const int BLOCKSIZE = 16; // 4 cache lines 126 127 struct track_t { 128 uint32_t needs; 129 130 union { 131 int16_t volume[2]; // [0]3.12 fixed point 132 int32_t volumeRL; 133 }; 134 135 int32_t prevVolume[2]; 136 137 int32_t volumeInc[2]; 138 int32_t auxLevel; 139 int32_t auxInc; 140 int32_t prevAuxLevel; 141 142 uint16_t frameCount; 143 144 uint8_t channelCount : 4; 145 uint8_t enabled : 1; 146 uint8_t reserved0 : 3; 147 uint8_t format; 148 uint32_t channelMask; 149 150 AudioBufferProvider* bufferProvider; 151 mutable AudioBufferProvider::Buffer buffer; 152 153 hook_t hook; 154 void const* in; // current location in buffer 155 156 AudioResampler* resampler; 157 uint32_t sampleRate; 158 int32_t* mainBuffer; 159 int32_t* auxBuffer; 160 161 bool setResampler(uint32_t sampleRate, uint32_t devSampleRate); 162 bool doesResample() const; 163 void resetResampler(); 164 void adjustVolumeRamp(bool aux); 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[32]; __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