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      1 /*
      2  * Copyright (C) 2015 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_AUDIO_IO_DESCRIPTOR_H
     18 #define ANDROID_AUDIO_IO_DESCRIPTOR_H
     19 
     20 namespace android {
     21 
     22 enum audio_io_config_event {
     23     AUDIO_OUTPUT_OPENED,
     24     AUDIO_OUTPUT_CLOSED,
     25     AUDIO_OUTPUT_CONFIG_CHANGED,
     26     AUDIO_INPUT_OPENED,
     27     AUDIO_INPUT_CLOSED,
     28     AUDIO_INPUT_CONFIG_CHANGED,
     29 };
     30 
     31 // audio input/output descriptor used to cache output configurations in client process to avoid
     32 // frequent calls through IAudioFlinger
     33 class AudioIoDescriptor : public RefBase {
     34 public:
     35     AudioIoDescriptor() :
     36         mIoHandle(AUDIO_IO_HANDLE_NONE),
     37         mSamplingRate(0), mFormat(AUDIO_FORMAT_DEFAULT), mChannelMask(AUDIO_CHANNEL_NONE),
     38         mFrameCount(0), mFrameCountHAL(0), mLatency(0)
     39     {
     40         memset(&mPatch, 0, sizeof(struct audio_patch));
     41     }
     42 
     43     virtual ~AudioIoDescriptor() {}
     44 
     45     audio_port_handle_t getDeviceId() {
     46         if (mPatch.num_sources != 0 && mPatch.num_sinks != 0) {
     47             if (mPatch.sources[0].type == AUDIO_PORT_TYPE_MIX) {
     48                 // this is an output mix
     49                 // FIXME: the API only returns the first device in case of multiple device selection
     50                 return mPatch.sinks[0].id;
     51             } else {
     52                 // this is an input mix
     53                 return mPatch.sources[0].id;
     54             }
     55         }
     56         return AUDIO_PORT_HANDLE_NONE;
     57     }
     58 
     59     audio_io_handle_t       mIoHandle;
     60     struct audio_patch      mPatch;
     61     uint32_t                mSamplingRate;
     62     audio_format_t          mFormat;
     63     audio_channel_mask_t    mChannelMask;
     64     size_t                  mFrameCount;
     65     size_t                  mFrameCountHAL;
     66     uint32_t                mLatency;   // only valid for output
     67 };
     68 
     69 
     70 };  // namespace android
     71 
     72 #endif  /*ANDROID_AUDIO_IO_DESCRIPTOR_H*/
     73