AudioMixer.h revision f6b1678f8f508b447155a81b44e214475ab634a8 
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
27namespace android {
28
29// ----------------------------------------------------------------------------
30
31class AudioMixer
32{
33public:
34                            AudioMixer(size_t frameCount, uint32_t sampleRate);
35
36                            ~AudioMixer();
37
38    static const uint32_t MAX_NUM_TRACKS = 32;
39    static const uint32_t MAX_NUM_CHANNELS = 2;
40
41    static const uint16_t UNITY_GAIN = 0x1000;
42
43    enum { // names
44
45        // track units (MAX_NUM_TRACKS units)
46        TRACK0          = 0x1000,
47
48        // 0x2000 is unused
49
50        // setParameter targets
51        TRACK           = 0x3000,
52        RESAMPLE        = 0x3001,
53        RAMP_VOLUME     = 0x3002, // ramp to new volume
54        VOLUME          = 0x3003, // don't ramp
55
56        // set Parameter names
57        // for target TRACK
58        CHANNEL_MASK    = 0x4000,
59        FORMAT          = 0x4001,
60        MAIN_BUFFER     = 0x4002,
61        AUX_BUFFER      = 0x4003,
62        // for target RESAMPLE
63        SAMPLE_RATE     = 0x4100,
64        RESET           = 0x4101,
65        // for target RAMP_VOLUME and VOLUME (8 channels max)
66        VOLUME0         = 0x4200,
67        VOLUME1         = 0x4201,
68        AUXLEVEL        = 0x4210,
69    };
70
71
72    int         getTrackName();
73    void        deleteTrackName(int name);
74
75    void        enable();
76    void        disable();
77
78    void        setActiveTrack(int track);
79    void        setParameter(int target, int name, void *value);
80
81    void        setBufferProvider(AudioBufferProvider* bufferProvider);
82    void        process();
83
84    uint32_t    trackNames() const { return mTrackNames; }
85
86private:
87
88    enum {
89        NEEDS_CHANNEL_COUNT__MASK   = 0x00000003,
90        NEEDS_FORMAT__MASK          = 0x000000F0,
91        NEEDS_MUTE__MASK            = 0x00000100,
92        NEEDS_RESAMPLE__MASK        = 0x00001000,
93        NEEDS_AUX__MASK             = 0x00010000,
94    };
95
96    enum {
97        NEEDS_CHANNEL_1             = 0x00000000,
98        NEEDS_CHANNEL_2             = 0x00000001,
99
100        NEEDS_FORMAT_16             = 0x00000010,
101
102        NEEDS_MUTE_DISABLED         = 0x00000000,
103        NEEDS_MUTE_ENABLED          = 0x00000100,
104
105        NEEDS_RESAMPLE_DISABLED     = 0x00000000,
106        NEEDS_RESAMPLE_ENABLED      = 0x00001000,
107
108        NEEDS_AUX_DISABLED     = 0x00000000,
109        NEEDS_AUX_ENABLED      = 0x00010000,
110    };
111
112    struct state_t;
113    struct track_t;
114
115    typedef void (*mix_t)(state_t* state);
116    typedef void (*hook_t)(track_t* t, int32_t* output, size_t numOutFrames, int32_t* temp, int32_t* aux);
117    static const int BLOCKSIZE = 16; // 4 cache lines
118
119    struct track_t {
120        uint32_t    needs;
121
122        union {
123        int16_t     volume[MAX_NUM_CHANNELS]; // [0]3.12 fixed point
124        int32_t     volumeRL;
125        };
126
127        int32_t     prevVolume[MAX_NUM_CHANNELS];
128
129        int32_t     volumeInc[MAX_NUM_CHANNELS];
130        int32_t     auxLevel;
131        int32_t     auxInc;
132        int32_t     prevAuxLevel;
133
134        uint16_t    frameCount;
135
136        uint8_t     channelCount : 4;
137        uint8_t     enabled      : 1;
138        uint8_t     reserved0    : 3;
139        uint8_t     format;
140        uint32_t    channelMask;
141
142        AudioBufferProvider*                bufferProvider;
143        mutable AudioBufferProvider::Buffer buffer;
144
145        hook_t      hook;
146        void const* in;             // current location in buffer
147
148        AudioResampler*     resampler;
149        uint32_t            sampleRate;
150        int32_t*           mainBuffer;
151        int32_t*           auxBuffer;
152
153        bool        setResampler(uint32_t sampleRate, uint32_t devSampleRate);
154        bool        doesResample() const;
155        void        resetResampler();
156        void        adjustVolumeRamp(bool aux);
157    };
158
159    // pad to 32-bytes to fill cache line
160    struct state_t {
161        uint32_t        enabledTracks;
162        uint32_t        needsChanged;
163        size_t          frameCount;
164        mix_t           hook;
165        int32_t         *outputTemp;
166        int32_t         *resampleTemp;
167        int32_t         reserved[2];
168        track_t         tracks[MAX_NUM_TRACKS]; __attribute__((aligned(32)));
169    };
170
171    int             mActiveTrack;
172    uint32_t        mTrackNames;
173    const uint32_t  mSampleRate;
174
175    state_t         mState __attribute__((aligned(32)));
176
177    void invalidateState(uint32_t mask);
178
179    static void track__genericResample(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux);
180    static void track__nop(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux);
181    static void track__16BitsStereo(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux);
182    static void track__16BitsMono(track_t* t, int32_t* out, size_t numFrames, int32_t* temp, int32_t* aux);
183    static void volumeRampStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, int32_t* aux);
184    static void volumeStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, int32_t* aux);
185
186    static void process__validate(state_t* state);
187    static void process__nop(state_t* state);
188    static void process__genericNoResampling(state_t* state);
189    static void process__genericResampling(state_t* state);
190    static void process__OneTrack16BitsStereoNoResampling(state_t* state);
191#if 0
192    static void process__TwoTracks16BitsStereoNoResampling(state_t* state);
193#endif
194};
195
196// ----------------------------------------------------------------------------
197}; // namespace android
198
199#endif // ANDROID_AUDIO_MIXER_H
200