AudioPolicyEffects.h revision 223fd5c9738e9665e495904d37d4632414b68c1e 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_AUDIOPOLICYEFFECTS_H
18#define ANDROID_AUDIOPOLICYEFFECTS_H
19
20#include <stdlib.h>
21#include <stdio.h>
22#include <string.h>
23#include <cutils/misc.h>
24#include <media/AudioEffect.h>
25#include <system/audio.h>
26#include <hardware/audio_effect.h>
27#include <utils/Vector.h>
28#include <utils/SortedVector.h>
29
30namespace android {
31
32// ----------------------------------------------------------------------------
33
34// AudioPolicyEffects class
35// This class will manage all effects attached to input and output streams in
36// AudioPolicyService as configured in audio_effects.conf.
37class AudioPolicyEffects : public RefBase
38{
39
40public:
41
42    // The constructor will parse audio_effects.conf
43    // First it will look whether vendor specific file exists,
44    // otherwise it will parse the system default file.
45	         AudioPolicyEffects();
46    virtual ~AudioPolicyEffects();
47
48    // NOTE: methods on AudioPolicyEffects should never be called with the AudioPolicyService
49    // main mutex (mLock) held as they will indirectly call back into AudioPolicyService when
50    // managing audio effects.
51
52    // Return a list of effect descriptors for default input effects
53    // associated with audioSession
54    status_t queryDefaultInputEffects(int audioSession,
55                             effect_descriptor_t *descriptors,
56                             uint32_t *count);
57
58    // Add all input effects associated with this input
59    // Effects are attached depending on the audio_source_t
60    status_t addInputEffects(audio_io_handle_t input,
61                             audio_source_t inputSource,
62                             int audioSession);
63
64    // Add all input effects associated to this input
65    status_t releaseInputEffects(audio_io_handle_t input);
66
67
68    // Return a list of effect descriptors for default output effects
69    // associated with audioSession
70    status_t queryDefaultOutputSessionEffects(int audioSession,
71                             effect_descriptor_t *descriptors,
72                             uint32_t *count);
73
74    // Add all output effects associated to this output
75    // Effects are attached depending on the audio_stream_type_t
76    status_t addOutputSessionEffects(audio_io_handle_t output,
77                             audio_stream_type_t stream,
78                             int audioSession);
79
80    // release all output effects associated with this output stream and audiosession
81    status_t releaseOutputSessionEffects(audio_io_handle_t output,
82                             audio_stream_type_t stream,
83                             int audioSession);
84
85private:
86
87    // class to store the description of an effects and its parameters
88    // as defined in audio_effects.conf
89    class EffectDesc {
90    public:
91        EffectDesc(const char *name, const effect_uuid_t& uuid) :
92                        mName(strdup(name)),
93                        mUuid(uuid) { }
94        EffectDesc(const EffectDesc& orig) :
95                        mName(strdup(orig.mName)),
96                        mUuid(orig.mUuid) {
97                            // deep copy mParams
98                            for (size_t k = 0; k < orig.mParams.size(); k++) {
99                                effect_param_t *origParam = orig.mParams[k];
100                                // psize and vsize are rounded up to an int boundary for allocation
101                                size_t origSize = sizeof(effect_param_t) +
102                                                  ((origParam->psize + 3) & ~3) +
103                                                  ((origParam->vsize + 3) & ~3);
104                                effect_param_t *dupParam = (effect_param_t *) malloc(origSize);
105                                memcpy(dupParam, origParam, origSize);
106                                // This works because the param buffer allocation is also done by
107                                // multiples of 4 bytes originally. In theory we should memcpy only
108                                // the actual param size, that is without rounding vsize.
109                                mParams.add(dupParam);
110                            }
111                        }
112        /*virtual*/ ~EffectDesc() {
113            free(mName);
114            for (size_t k = 0; k < mParams.size(); k++) {
115                free(mParams[k]);
116            }
117        }
118        char *mName;
119        effect_uuid_t mUuid;
120        Vector <effect_param_t *> mParams;
121    };
122
123    // class to store voctor of EffectDesc
124    class EffectDescVector {
125    public:
126        EffectDescVector() {}
127        /*virtual*/ ~EffectDescVector() {
128            for (size_t j = 0; j < mEffects.size(); j++) {
129                delete mEffects[j];
130            }
131        }
132        Vector <EffectDesc *> mEffects;
133    };
134
135    // class to store voctor of AudioEffects
136    class EffectVector {
137    public:
138        EffectVector(int session) : mSessionId(session), mRefCount(0) {}
139        /*virtual*/ ~EffectVector() {}
140
141        // Enable or disable all effects in effect vector
142        void setProcessorEnabled(bool enabled);
143
144        const int mSessionId;
145        // AudioPolicyManager keeps mLock, no need for lock on reference count here
146        int mRefCount;
147        Vector< sp<AudioEffect> >mEffects;
148    };
149
150
151    static const char * const kInputSourceNames[AUDIO_SOURCE_CNT -1];
152    static audio_source_t inputSourceNameToEnum(const char *name);
153
154    static const char *kStreamNames[AUDIO_STREAM_PUBLIC_CNT+1]; //+1 required as streams start from -1
155    audio_stream_type_t streamNameToEnum(const char *name);
156
157    // Parse audio_effects.conf
158    status_t loadAudioEffectConfig(const char *path);
159
160    // Load all effects descriptors in configuration file
161    status_t loadEffects(cnode *root, Vector <EffectDesc *>& effects);
162    EffectDesc *loadEffect(cnode *root);
163
164    // Load all automatic effect configurations
165    status_t loadInputEffectConfigurations(cnode *root, const Vector <EffectDesc *>& effects);
166    status_t loadStreamEffectConfigurations(cnode *root, const Vector <EffectDesc *>& effects);
167    EffectDescVector *loadEffectConfig(cnode *root, const Vector <EffectDesc *>& effects);
168
169    // Load all automatic effect parameters
170    void loadEffectParameters(cnode *root, Vector <effect_param_t *>& params);
171    effect_param_t *loadEffectParameter(cnode *root);
172    size_t readParamValue(cnode *node,
173                          char *param,
174                          size_t *curSize,
175                          size_t *totSize);
176    size_t growParamSize(char *param,
177                         size_t size,
178                         size_t *curSize,
179                         size_t *totSize);
180
181    // protects access to mInputSources, mInputs, mOutputStreams, mOutputSessions
182    Mutex mLock;
183    // Automatic input effects are configured per audio_source_t
184    KeyedVector< audio_source_t, EffectDescVector* > mInputSources;
185    // Automatic input effects are unique for audio_io_handle_t
186    KeyedVector< audio_io_handle_t, EffectVector* > mInputs;
187
188    // Automatic output effects are organized per audio_stream_type_t
189    KeyedVector< audio_stream_type_t, EffectDescVector* > mOutputStreams;
190    // Automatic output effects are unique for audiosession ID
191    KeyedVector< int32_t, EffectVector* > mOutputSessions;
192};
193
194}; // namespace android
195
196#endif // ANDROID_AUDIOPOLICYEFFECTS_H
197