Home | History | Annotate | Download | only in media 
      1 /*
      2  * Copyright (C) 2007 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_IAUDIOTRACK_H
     18 #define ANDROID_IAUDIOTRACK_H
     19 
     20 #include <stdint.h>
     21 #include <sys/types.h>
     22 
     23 #include <utils/RefBase.h>
     24 #include <utils/Errors.h>
     25 #include <binder/IInterface.h>
     26 #include <binder/IMemory.h>
     27 
     28 
     29 namespace android {
     30 
     31 // ----------------------------------------------------------------------------
     32 
     33 class IAudioTrack : public IInterface
     34 {
     35 public:
     36     DECLARE_META_INTERFACE(AudioTrack);
     37 
     38     /* After it's created the track is not active. Call start() to
     39      * make it active. If set, the callback will start being called.
     40      */
     41     virtual status_t    start() = 0;
     42 
     43     /* Stop a track. If set, the callback will cease being called and
     44      * obtainBuffer will return an error. Buffers that are already released
     45      * will be processed, unless flush() is called.
     46      */
     47     virtual void        stop() = 0;
     48 
     49     /* flush a stopped track. All pending buffers are discarded.
     50      * This function has no effect if the track is not stoped.
     51      */
     52     virtual void        flush() = 0;
     53 
     54     /* mute or unmutes this track.
     55      * While mutted, the callback, if set, is still called.
     56      */
     57     virtual void        mute(bool) = 0;
     58 
     59     /* Pause a track. If set, the callback will cease being called and
     60      * obtainBuffer will return an error. Buffers that are already released
     61      * will be processed, unless flush() is called.
     62      */
     63     virtual void        pause() = 0;
     64 
     65     /* Attach track auxiliary output to specified effect. Use effectId = 0
     66      * to detach track from effect.
     67      */
     68     virtual status_t    attachAuxEffect(int effectId) = 0;
     69 
     70     /* get this tracks control block */
     71     virtual sp<IMemory> getCblk() const = 0;
     72 };
     73 
     74 // ----------------------------------------------------------------------------
     75 
     76 class BnAudioTrack : public BnInterface<IAudioTrack>
     77 {
     78 public:
     79     virtual status_t    onTransact( uint32_t code,
     80                                     const Parcel& data,
     81                                     Parcel* reply,
     82                                     uint32_t flags = 0);
     83 };
     84 
     85 // ----------------------------------------------------------------------------
     86 
     87 }; // namespace android
     88 
     89 #endif // ANDROID_IAUDIOTRACK_H
     90