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_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 94 size_t getUnreleasedFrames(int name); 95 96 private: 97 98 enum { 99 NEEDS_CHANNEL_COUNT__MASK = 0x00000003, 100 NEEDS_FORMAT__MASK = 0x000000F0, 101 NEEDS_MUTE__MASK = 0x00000100, 102 NEEDS_RESAMPLE__MASK = 0x00001000, 103 NEEDS_AUX__MASK = 0x00010000, 104 }; 105 106 enum { 107 NEEDS_CHANNEL_1 = 0x00000000, 108 NEEDS_CHANNEL_2 = 0x00000001, 109 110 NEEDS_FORMAT_16 = 0x00000010, 111 112 NEEDS_MUTE_DISABLED = 0x00000000, 113 NEEDS_MUTE_ENABLED = 0x00000100, 114 115 NEEDS_RESAMPLE_DISABLED = 0x00000000, 116 NEEDS_RESAMPLE_ENABLED = 0x00001000, 117 118 NEEDS_AUX_DISABLED = 0x00000000, 119 NEEDS_AUX_ENABLED = 0x00010000, 120 }; 121 122 static inline int32_t applyVolume(int32_t in, int32_t v) { 123 return in * v; 124 } 125 126 127 struct state_t; 128 struct track_t; 129 130 typedef void (*mix_t)(state_t* state); 131 typedef void (*hook_t)(track_t* t, int32_t* output, size_t numOutFrames, int32_t* temp, int32_t* aux); 132 static const int BLOCKSIZE = 16; // 4 cache lines 133 134 struct track_t { 135 uint32_t needs; 136 137 union { 138 int16_t volume[2]; // [0]3.12 fixed point 139 int32_t volumeRL; 140 }; 141 142 int32_t prevVolume[2]; 143 144 int32_t volumeInc[2]; 145 int32_t auxLevel; 146 int32_t auxInc; 147 int32_t prevAuxLevel; 148 149 uint16_t frameCount; 150 151 uint8_t channelCount : 4; 152 uint8_t enabled : 1; 153 uint8_t reserved0 : 3; 154 uint8_t format; 155 uint32_t channelMask; 156 157 AudioBufferProvider* bufferProvider; 158 mutable AudioBufferProvider::Buffer buffer; 159 160 hook_t hook; 161 void const* in; // current location in buffer 162 163 AudioResampler* resampler; 164 uint32_t sampleRate; 165 int32_t* mainBuffer; 166 int32_t* auxBuffer; 167 168 bool setResampler(uint32_t sampleRate, uint32_t devSampleRate); 169 bool doesResample() const; 170 void resetResampler(); 171 void adjustVolumeRamp(bool aux); 172 size_t getUnreleasedFrames(); 173 }; 174 175 // pad to 32-bytes to fill cache line 176 struct state_t { 177 uint32_t enabledTracks; 178 uint32_t needsChanged; 179 size_t frameCount; 180 mix_t hook; 181 int32_t *outputTemp; 182 int32_t *resampleTemp; 183 int32_t reserved[2]; 184 track_t tracks[32]; __attribute__((aligned(32))); 185 }; 186 187 int mActiveTrack; 188 uint32_t mTrackNames; 189 const uint32_t mSampleRate; 190 191 state_t mState __attribute__((aligned(32))); 192 193 void invalidateState(uint32_t mask); 194 195 static void track__genericResample(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 196 static void track__nop(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 197 static void track__16BitsStereo(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 198 static void track__16BitsMono(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 199 static void volumeRampStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, int32_t* aux); 200 static void volumeStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, int32_t* aux); 201 202 static void process__validate(state_t* state); 203 static void process__nop(state_t* state); 204 static void process__genericNoResampling(state_t* state); 205 static void process__genericResampling(state_t* state); 206 static void process__OneTrack16BitsStereoNoResampling(state_t* state); 207 static void process__TwoTracks16BitsStereoNoResampling(state_t* state); 208 }; 209 210 // ---------------------------------------------------------------------------- 211 }; // namespace android 212 213 #endif // ANDROID_AUDIO_MIXER_H 214
