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 // for TARGET RESAMPLE 67 SAMPLE_RATE = 0x4100, 68 // for TARGET VOLUME (8 channels max) 69 VOLUME0 = 0x4200, 70 VOLUME1 = 0x4201, 71 }; 72 73 74 int getTrackName(); 75 void deleteTrackName(int name); 76 77 status_t enable(int name); 78 status_t disable(int name); 79 80 status_t setActiveTrack(int track); 81 status_t setParameter(int target, int name, int value); 82 83 status_t setBufferProvider(AudioBufferProvider* bufferProvider); 84 void process(void* output); 85 trackNames()86 uint32_t trackNames() const { return mTrackNames; } 87 88 static void ditherAndClamp(int32_t* out, int32_t const *sums, size_t c); 89 90 private: 91 92 enum { 93 NEEDS_CHANNEL_COUNT__MASK = 0x00000003, 94 NEEDS_FORMAT__MASK = 0x000000F0, 95 NEEDS_MUTE__MASK = 0x00000100, 96 NEEDS_RESAMPLE__MASK = 0x00001000, 97 }; 98 99 enum { 100 NEEDS_CHANNEL_1 = 0x00000000, 101 NEEDS_CHANNEL_2 = 0x00000001, 102 103 NEEDS_FORMAT_16 = 0x00000010, 104 105 NEEDS_MUTE_DISABLED = 0x00000000, 106 NEEDS_MUTE_ENABLED = 0x00000100, 107 108 NEEDS_RESAMPLE_DISABLED = 0x00000000, 109 NEEDS_RESAMPLE_ENABLED = 0x00001000, 110 }; 111 applyVolume(int32_t in,int32_t v)112 static inline int32_t applyVolume(int32_t in, int32_t v) { 113 return in * v; 114 } 115 116 117 struct state_t; 118 119 typedef void (*mix_t)(state_t* state, void* output); 120 121 static const int BLOCKSIZE = 16; // 4 cache lines 122 123 struct track_t { 124 uint32_t needs; 125 126 union { 127 int16_t volume[2]; // [0]3.12 fixed point 128 int32_t volumeRL; 129 }; 130 131 int32_t prevVolume[2]; 132 133 int32_t volumeInc[2]; 134 135 uint16_t frameCount; 136 137 uint8_t channelCount : 4; 138 uint8_t enabled : 1; 139 uint8_t reserved0 : 3; 140 uint8_t format; 141 142 AudioBufferProvider* bufferProvider; 143 mutable AudioBufferProvider::Buffer buffer; 144 145 void (*hook)(track_t* t, int32_t* output, size_t numOutFrames, int32_t* temp); 146 void const* in; // current location in buffer 147 148 AudioResampler* resampler; 149 uint32_t sampleRate; 150 151 bool setResampler(uint32_t sampleRate, uint32_t devSampleRate); 152 bool doesResample() const; 153 void adjustVolumeRamp(); 154 }; 155 156 // pad to 32-bytes to fill cache line 157 struct state_t { 158 uint32_t enabledTracks; 159 uint32_t needsChanged; 160 size_t frameCount; 161 mix_t hook; 162 int32_t *outputTemp; 163 int32_t *resampleTemp; 164 int32_t reserved[2]; 165 track_t tracks[32]; __attribute__((aligned(32))); 166 }; 167 168 int mActiveTrack; 169 uint32_t mTrackNames; 170 const uint32_t mSampleRate; 171 172 state_t mState __attribute__((aligned(32))); 173 174 void invalidateState(uint32_t mask); 175 176 static void track__genericResample(track_t* t, int32_t* out, size_t numFrames, int32_t* temp); 177 static void track__nop(track_t* t, int32_t* out, size_t numFrames, int32_t* temp); 178 static void volumeRampStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp); 179 static void track__16BitsStereo(track_t* t, int32_t* out, size_t numFrames, int32_t* temp); 180 static void track__16BitsMono(track_t* t, int32_t* out, size_t numFrames, int32_t* temp); 181 182 static void process__validate(state_t* state, void* output); 183 static void process__nop(state_t* state, void* output); 184 static void process__genericNoResampling(state_t* state, void* output); 185 static void process__genericResampling(state_t* state, void* output); 186 static void process__OneTrack16BitsStereoNoResampling(state_t* state, void* output); 187 static void process__TwoTracks16BitsStereoNoResampling(state_t* state, void* output); 188 }; 189 190 // ---------------------------------------------------------------------------- 191 }; // namespace android 192 193 #endif // ANDROID_AUDIO_MIXER_H 194