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 27 namespace 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 36 class AudioMixer 37 { 38 public: 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_COUNT = 0x4000, 65 FORMAT = 0x4001, 66 MAIN_BUFFER = 0x4002, 67 AUX_BUFFER = 0x4003, 68 // for TARGET RESAMPLE 69 SAMPLE_RATE = 0x4100, 70 // for TARGET 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 status_t enable(int name); 81 status_t disable(int name); 82 83 status_t setActiveTrack(int track); 84 status_t setParameter(int target, int name, void *value); 85 86 status_t 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 93 private: 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; 152 153 AudioBufferProvider* bufferProvider; 154 mutable AudioBufferProvider::Buffer buffer; 155 156 hook_t hook; 157 void const* in; // current location in buffer 158 159 AudioResampler* resampler; 160 uint32_t sampleRate; 161 int32_t* mainBuffer; 162 int32_t* auxBuffer; 163 164 bool setResampler(uint32_t sampleRate, uint32_t devSampleRate); 165 bool doesResample() const; 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[32]; __attribute__((aligned(32))); 179 }; 180 181 int mActiveTrack; 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
