/* ** ** Copyright 2007, The Android Open Source Project ** ** Licensed under the Apache License, Version 2.0 (the "License"); ** you may not use this file except in compliance with the License. ** You may obtain a copy of the License at ** ** http://www.apache.org/licenses/LICENSE-2.0 ** ** Unless required by applicable law or agreed to in writing, software ** distributed under the License is distributed on an "AS IS" BASIS, ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. ** See the License for the specific language governing permissions and ** limitations under the License. */ #ifndef ANDROID_AUDIO_MIXER_H #define ANDROID_AUDIO_MIXER_H #include #include #include #include #include "AudioResampler.h" #include #include #include namespace android { // ---------------------------------------------------------------------------- class AudioMixer { public: AudioMixer(size_t frameCount, uint32_t sampleRate, uint32_t maxNumTracks = MAX_NUM_TRACKS); /*virtual*/ ~AudioMixer(); // non-virtual saves a v-table, restore if sub-classed // This mixer has a hard-coded upper limit of 32 active track inputs. // Adding support for > 32 tracks would require more than simply changing this value. static const uint32_t MAX_NUM_TRACKS = 32; // maximum number of channels supported by the mixer // This mixer has a hard-coded upper limit of 2 channels for output. // There is support for > 2 channel tracks down-mixed to 2 channel output via a down-mix effect. // Adding support for > 2 channel output would require more than simply changing this value. static const uint32_t MAX_NUM_CHANNELS = 2; // maximum number of channels supported for the content static const uint32_t MAX_NUM_CHANNELS_TO_DOWNMIX = 8; static const uint16_t UNITY_GAIN = 0x1000; enum { // names // track names (MAX_NUM_TRACKS units) TRACK0 = 0x1000, // 0x2000 is unused // setParameter targets TRACK = 0x3000, RESAMPLE = 0x3001, RAMP_VOLUME = 0x3002, // ramp to new volume VOLUME = 0x3003, // don't ramp // set Parameter names // for target TRACK CHANNEL_MASK = 0x4000, FORMAT = 0x4001, MAIN_BUFFER = 0x4002, AUX_BUFFER = 0x4003, DOWNMIX_TYPE = 0X4004, MIXER_FORMAT = 0x4005, // AUDIO_FORMAT_PCM_(FLOAT|16_BIT) // for target RESAMPLE SAMPLE_RATE = 0x4100, // Configure sample rate conversion on this track name; // parameter 'value' is the new sample rate in Hz. // Only creates a sample rate converter the first time that // the track sample rate is different from the mix sample rate. // If the new sample rate is the same as the mix sample rate, // and a sample rate converter already exists, // then the sample rate converter remains present but is a no-op. RESET = 0x4101, // Reset sample rate converter without changing sample rate. // This clears out the resampler's input buffer. REMOVE = 0x4102, // Remove the sample rate converter on this track name; // the track is restored to the mix sample rate. // for target RAMP_VOLUME and VOLUME (8 channels max) VOLUME0 = 0x4200, VOLUME1 = 0x4201, AUXLEVEL = 0x4210, }; // For all APIs with "name": TRACK0 <= name < TRACK0 + MAX_NUM_TRACKS // Allocate a track name. Returns new track name if successful, -1 on failure. int getTrackName(audio_channel_mask_t channelMask, int sessionId); // Free an allocated track by name void deleteTrackName(int name); // Enable or disable an allocated track by name void enable(int name); void disable(int name); void setParameter(int name, int target, int param, void *value); void setBufferProvider(int name, AudioBufferProvider* bufferProvider); void process(int64_t pts); uint32_t trackNames() const { return mTrackNames; } size_t getUnreleasedFrames(int name) const; private: enum { // FIXME this representation permits up to 8 channels NEEDS_CHANNEL_COUNT__MASK = 0x00000007, }; enum { NEEDS_CHANNEL_1 = 0x00000000, // mono NEEDS_CHANNEL_2 = 0x00000001, // stereo // sample format is not explicitly specified, and is assumed to be AUDIO_FORMAT_PCM_16_BIT NEEDS_MUTE = 0x00000100, NEEDS_RESAMPLE = 0x00001000, NEEDS_AUX = 0x00010000, }; struct state_t; struct track_t; class DownmixerBufferProvider; typedef void (*hook_t)(track_t* t, int32_t* output, size_t numOutFrames, int32_t* temp, int32_t* aux); static const int BLOCKSIZE = 16; // 4 cache lines struct track_t { uint32_t needs; union { int16_t volume[MAX_NUM_CHANNELS]; // [0]3.12 fixed point int32_t volumeRL; }; int32_t prevVolume[MAX_NUM_CHANNELS]; // 16-byte boundary int32_t volumeInc[MAX_NUM_CHANNELS]; int32_t auxInc; int32_t prevAuxLevel; // 16-byte boundary int16_t auxLevel; // 0 <= auxLevel <= MAX_GAIN_INT, but signed for mul performance uint16_t frameCount; uint8_t channelCount; // 1 or 2, redundant with (needs & NEEDS_CHANNEL_COUNT__MASK) uint8_t format; // always 16 uint16_t enabled; // actually bool audio_channel_mask_t channelMask; // actual buffer provider used by the track hooks, see DownmixerBufferProvider below // for how the Track buffer provider is wrapped by another one when dowmixing is required AudioBufferProvider* bufferProvider; // 16-byte boundary mutable AudioBufferProvider::Buffer buffer; // 8 bytes hook_t hook; const void* in; // current location in buffer // 16-byte boundary AudioResampler* resampler; uint32_t sampleRate; int32_t* mainBuffer; int32_t* auxBuffer; // 16-byte boundary DownmixerBufferProvider* downmixerBufferProvider; // 4 bytes int32_t sessionId; audio_format_t mMixerFormat; // at this time: AUDIO_FORMAT_PCM_(FLOAT|16_BIT) int32_t padding[1]; // 16-byte boundary bool setResampler(uint32_t sampleRate, uint32_t devSampleRate); bool doesResample() const { return resampler != NULL; } void resetResampler() { if (resampler != NULL) resampler->reset(); } void adjustVolumeRamp(bool aux); size_t getUnreleasedFrames() const { return resampler != NULL ? resampler->getUnreleasedFrames() : 0; }; }; // pad to 32-bytes to fill cache line struct state_t { uint32_t enabledTracks; uint32_t needsChanged; size_t frameCount; void (*hook)(state_t* state, int64_t pts); // one of process__*, never NULL int32_t *outputTemp; int32_t *resampleTemp; NBLog::Writer* mLog; int32_t reserved[1]; // FIXME allocate dynamically to save some memory when maxNumTracks < MAX_NUM_TRACKS track_t tracks[MAX_NUM_TRACKS] __attribute__((aligned(32))); }; // AudioBufferProvider that wraps a track AudioBufferProvider by a call to a downmix effect class DownmixerBufferProvider : public AudioBufferProvider { public: virtual status_t getNextBuffer(Buffer* buffer, int64_t pts); virtual void releaseBuffer(Buffer* buffer); DownmixerBufferProvider(); virtual ~DownmixerBufferProvider(); AudioBufferProvider* mTrackBufferProvider; effect_handle_t mDownmixHandle; effect_config_t mDownmixConfig; }; // bitmask of allocated track names, where bit 0 corresponds to TRACK0 etc. uint32_t mTrackNames; // bitmask of configured track names; ~0 if maxNumTracks == MAX_NUM_TRACKS, // but will have fewer bits set if maxNumTracks < MAX_NUM_TRACKS const uint32_t mConfiguredNames; const uint32_t mSampleRate; NBLog::Writer mDummyLog; public: void setLog(NBLog::Writer* log); private: state_t mState __attribute__((aligned(32))); // effect descriptor for the downmixer used by the mixer static effect_descriptor_t sDwnmFxDesc; // indicates whether a downmix effect has been found and is usable by this mixer static bool sIsMultichannelCapable; // Call after changing either the enabled status of a track, or parameters of an enabled track. // OK to call more often than that, but unnecessary. void invalidateState(uint32_t mask); static status_t initTrackDownmix(track_t* pTrack, int trackNum, audio_channel_mask_t mask); static status_t prepareTrackForDownmix(track_t* pTrack, int trackNum); static void unprepareTrackForDownmix(track_t* pTrack, int trackName); static void track__genericResample(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); static void track__nop(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); static void track__16BitsStereo(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); static void track__16BitsMono(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux); static void volumeRampStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, int32_t* aux); static void volumeStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, int32_t* aux); static void process__validate(state_t* state, int64_t pts); static void process__nop(state_t* state, int64_t pts); static void process__genericNoResampling(state_t* state, int64_t pts); static void process__genericResampling(state_t* state, int64_t pts); static void process__OneTrack16BitsStereoNoResampling(state_t* state, int64_t pts); #if 0 static void process__TwoTracks16BitsStereoNoResampling(state_t* state, int64_t pts); #endif static int64_t calculateOutputPTS(const track_t& t, int64_t basePTS, int outputFrameIndex); static uint64_t sLocalTimeFreq; static pthread_once_t sOnceControl; static void sInitRoutine(); }; // ---------------------------------------------------------------------------- }; // namespace android #endif // ANDROID_AUDIO_MIXER_H