1 /* 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 <utils/threads.h> 25 26 #include <media/AudioBufferProvider.h> 27 #include "AudioResampler.h" 28 29 #include <audio_effects/effect_downmix.h> 30 #include <system/audio.h> 31 #include <media/nbaio/NBLog.h> 32 33 namespace android { 34 35 // ---------------------------------------------------------------------------- 36 37 class AudioMixer 38 { 39 public: 40 AudioMixer(size_t frameCount, uint32_t sampleRate, 41 uint32_t maxNumTracks = MAX_NUM_TRACKS); 42 43 /*virtual*/ ~AudioMixer(); // non-virtual saves a v-table, restore if sub-classed 44 45 46 // This mixer has a hard-coded upper limit of 32 active track inputs. 47 // Adding support for > 32 tracks would require more than simply changing this value. 48 static const uint32_t MAX_NUM_TRACKS = 32; 49 // maximum number of channels supported by the mixer 50 51 // This mixer has a hard-coded upper limit of 2 channels for output. 52 // There is support for > 2 channel tracks down-mixed to 2 channel output via a down-mix effect. 53 // Adding support for > 2 channel output would require more than simply changing this value. 54 static const uint32_t MAX_NUM_CHANNELS = 2; 55 // maximum number of channels supported for the content 56 static const uint32_t MAX_NUM_CHANNELS_TO_DOWNMIX = 8; 57 58 static const uint16_t UNITY_GAIN = 0x1000; 59 60 enum { // names 61 62 // track names (MAX_NUM_TRACKS units) 63 TRACK0 = 0x1000, 64 65 // 0x2000 is unused 66 67 // setParameter targets 68 TRACK = 0x3000, 69 RESAMPLE = 0x3001, 70 RAMP_VOLUME = 0x3002, // ramp to new volume 71 VOLUME = 0x3003, // don't ramp 72 73 // set Parameter names 74 // for target TRACK 75 CHANNEL_MASK = 0x4000, 76 FORMAT = 0x4001, 77 MAIN_BUFFER = 0x4002, 78 AUX_BUFFER = 0x4003, 79 DOWNMIX_TYPE = 0X4004, 80 // for target RESAMPLE 81 SAMPLE_RATE = 0x4100, // Configure sample rate conversion on this track name; 82 // parameter 'value' is the new sample rate in Hz. 83 // Only creates a sample rate converter the first time that 84 // the track sample rate is different from the mix sample rate. 85 // If the new sample rate is the same as the mix sample rate, 86 // and a sample rate converter already exists, 87 // then the sample rate converter remains present but is a no-op. 88 RESET = 0x4101, // Reset sample rate converter without changing sample rate. 89 // This clears out the resampler's input buffer. 90 REMOVE = 0x4102, // Remove the sample rate converter on this track name; 91 // the track is restored to the mix sample rate. 92 // for target RAMP_VOLUME and VOLUME (8 channels max) 93 VOLUME0 = 0x4200, 94 VOLUME1 = 0x4201, 95 AUXLEVEL = 0x4210, 96 }; 97 98 99 // For all APIs with "name": TRACK0 <= name < TRACK0 + MAX_NUM_TRACKS 100 101 // Allocate a track name. Returns new track name if successful, -1 on failure. 102 int getTrackName(audio_channel_mask_t channelMask, int sessionId); 103 104 // Free an allocated track by name 105 void deleteTrackName(int name); 106 107 // Enable or disable an allocated track by name 108 void enable(int name); 109 void disable(int name); 110 111 void setParameter(int name, int target, int param, void *value); 112 113 void setBufferProvider(int name, AudioBufferProvider* bufferProvider); 114 void process(int64_t pts); 115 trackNames()116 uint32_t trackNames() const { return mTrackNames; } 117 118 size_t getUnreleasedFrames(int name) const; 119 120 private: 121 122 enum { 123 NEEDS_CHANNEL_COUNT__MASK = 0x00000007, 124 NEEDS_FORMAT__MASK = 0x000000F0, 125 NEEDS_MUTE__MASK = 0x00000100, 126 NEEDS_RESAMPLE__MASK = 0x00001000, 127 NEEDS_AUX__MASK = 0x00010000, 128 }; 129 130 enum { 131 NEEDS_CHANNEL_1 = 0x00000000, 132 NEEDS_CHANNEL_2 = 0x00000001, 133 134 NEEDS_FORMAT_16 = 0x00000010, 135 136 NEEDS_MUTE_DISABLED = 0x00000000, 137 NEEDS_MUTE_ENABLED = 0x00000100, 138 139 NEEDS_RESAMPLE_DISABLED = 0x00000000, 140 NEEDS_RESAMPLE_ENABLED = 0x00001000, 141 142 NEEDS_AUX_DISABLED = 0x00000000, 143 NEEDS_AUX_ENABLED = 0x00010000, 144 }; 145 146 struct state_t; 147 struct track_t; 148 class DownmixerBufferProvider; 149 150 typedef void (*hook_t)(track_t* t, int32_t* output, size_t numOutFrames, int32_t* temp, 151 int32_t* aux); 152 static const int BLOCKSIZE = 16; // 4 cache lines 153 154 struct track_t { 155 uint32_t needs; 156 157 union { 158 int16_t volume[MAX_NUM_CHANNELS]; // [0]3.12 fixed point 159 int32_t volumeRL; 160 }; 161 162 int32_t prevVolume[MAX_NUM_CHANNELS]; 163 164 // 16-byte boundary 165 166 int32_t volumeInc[MAX_NUM_CHANNELS]; 167 int32_t auxInc; 168 int32_t prevAuxLevel; 169 170 // 16-byte boundary 171 172 int16_t auxLevel; // 0 <= auxLevel <= MAX_GAIN_INT, but signed for mul performance 173 uint16_t frameCount; 174 175 uint8_t channelCount; // 1 or 2, redundant with (needs & NEEDS_CHANNEL_COUNT__MASK) 176 uint8_t format; // always 16 177 uint16_t enabled; // actually bool 178 audio_channel_mask_t channelMask; 179 180 // actual buffer provider used by the track hooks, see DownmixerBufferProvider below 181 // for how the Track buffer provider is wrapped by another one when dowmixing is required 182 AudioBufferProvider* bufferProvider; 183 184 // 16-byte boundary 185 186 mutable AudioBufferProvider::Buffer buffer; // 8 bytes 187 188 hook_t hook; 189 const void* in; // current location in buffer 190 191 // 16-byte boundary 192 193 AudioResampler* resampler; 194 uint32_t sampleRate; 195 int32_t* mainBuffer; 196 int32_t* auxBuffer; 197 198 // 16-byte boundary 199 200 DownmixerBufferProvider* downmixerBufferProvider; // 4 bytes 201 202 int32_t sessionId; 203 204 int32_t padding[2]; 205 206 // 16-byte boundary 207 208 bool setResampler(uint32_t sampleRate, uint32_t devSampleRate); doesResampletrack_t209 bool doesResample() const { return resampler != NULL; } resetResamplertrack_t210 void resetResampler() { if (resampler != NULL) resampler->reset(); } 211 void adjustVolumeRamp(bool aux); getUnreleasedFramestrack_t212 size_t getUnreleasedFrames() const { return resampler != NULL ? 213 resampler->getUnreleasedFrames() : 0; }; 214 }; 215 216 // pad to 32-bytes to fill cache line 217 struct state_t { 218 uint32_t enabledTracks; 219 uint32_t needsChanged; 220 size_t frameCount; 221 void (*hook)(state_t* state, int64_t pts); // one of process__*, never NULL 222 int32_t *outputTemp; 223 int32_t *resampleTemp; 224 NBLog::Writer* mLog; 225 int32_t reserved[1]; 226 // FIXME allocate dynamically to save some memory when maxNumTracks < MAX_NUM_TRACKS 227 track_t tracks[MAX_NUM_TRACKS]; __attribute__((aligned(32))); 228 }; 229 230 // AudioBufferProvider that wraps a track AudioBufferProvider by a call to a downmix effect 231 class DownmixerBufferProvider : public AudioBufferProvider { 232 public: 233 virtual status_t getNextBuffer(Buffer* buffer, int64_t pts); 234 virtual void releaseBuffer(Buffer* buffer); 235 DownmixerBufferProvider(); 236 virtual ~DownmixerBufferProvider(); 237 238 AudioBufferProvider* mTrackBufferProvider; 239 effect_handle_t mDownmixHandle; 240 effect_config_t mDownmixConfig; 241 }; 242 243 // bitmask of allocated track names, where bit 0 corresponds to TRACK0 etc. 244 uint32_t mTrackNames; 245 246 // bitmask of configured track names; ~0 if maxNumTracks == MAX_NUM_TRACKS, 247 // but will have fewer bits set if maxNumTracks < MAX_NUM_TRACKS 248 const uint32_t mConfiguredNames; 249 250 const uint32_t mSampleRate; 251 252 NBLog::Writer mDummyLog; 253 public: 254 void setLog(NBLog::Writer* log); 255 private: 256 state_t mState __attribute__((aligned(32))); 257 258 // effect descriptor for the downmixer used by the mixer 259 static effect_descriptor_t dwnmFxDesc; 260 // indicates whether a downmix effect has been found and is usable by this mixer 261 static bool isMultichannelCapable; 262 263 // Call after changing either the enabled status of a track, or parameters of an enabled track. 264 // OK to call more often than that, but unnecessary. 265 void invalidateState(uint32_t mask); 266 267 static status_t initTrackDownmix(track_t* pTrack, int trackNum, audio_channel_mask_t mask); 268 static status_t prepareTrackForDownmix(track_t* pTrack, int trackNum); 269 static void unprepareTrackForDownmix(track_t* pTrack, int trackName); 270 271 static void track__genericResample(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, 272 int32_t* aux); 273 static void track__nop(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); 274 static void track__16BitsStereo(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, 275 int32_t* aux); 276 static void track__16BitsMono(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, 277 int32_t* aux); 278 static void volumeRampStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, 279 int32_t* aux); 280 static void volumeStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, 281 int32_t* aux); 282 283 static void process__validate(state_t* state, int64_t pts); 284 static void process__nop(state_t* state, int64_t pts); 285 static void process__genericNoResampling(state_t* state, int64_t pts); 286 static void process__genericResampling(state_t* state, int64_t pts); 287 static void process__OneTrack16BitsStereoNoResampling(state_t* state, 288 int64_t pts); 289 #if 0 290 static void process__TwoTracks16BitsStereoNoResampling(state_t* state, 291 int64_t pts); 292 #endif 293 294 static int64_t calculateOutputPTS(const track_t& t, int64_t basePTS, 295 int outputFrameIndex); 296 297 static uint64_t sLocalTimeFreq; 298 static pthread_once_t sOnceControl; 299 static void sInitRoutine(); 300 }; 301 302 // ---------------------------------------------------------------------------- 303 }; // namespace android 304 305 #endif // ANDROID_AUDIO_MIXER_H 306