Home | History | Annotate | Download | only in legacy 
      1 /*
      2  * Copyright 2016 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 LEGACY_AUDIO_STREAM_LEGACY_H
     18 #define LEGACY_AUDIO_STREAM_LEGACY_H
     19 
     20 #include <media/AudioTimestamp.h>
     21 #include <media/AudioSystem.h>
     22 
     23 #include <aaudio/AAudio.h>
     24 
     25 #include "AudioStream.h"
     26 #include "AAudioLegacy.h"
     27 #include "utility/AAudioUtilities.h"
     28 #include "utility/FixedBlockAdapter.h"
     29 
     30 namespace aaudio {
     31 
     32 
     33 typedef void (*aaudio_legacy_callback_t)(int event, void* user, void *info);
     34 
     35 enum {
     36     /**
     37      * Request that the callback function should fill the data buffer of an output stream,
     38      * or process the data of an input stream.
     39      * The address parameter passed to the callback function will point to a data buffer.
     40      * For an input stream, the data is read-only.
     41      * The value1 parameter will be the number of frames.
     42      * The value2 parameter is reserved and will be set to zero.
     43      * The callback should return AAUDIO_CALLBACK_RESULT_CONTINUE or AAUDIO_CALLBACK_RESULT_STOP.
     44      */
     45             AAUDIO_CALLBACK_OPERATION_PROCESS_DATA,
     46 
     47     /**
     48      * Inform the callback function that the stream was disconnected.
     49      * The address parameter passed to the callback function will be NULL.
     50      * The value1 will be an error code or AAUDIO_OK.
     51      * The value2 parameter is reserved and will be set to zero.
     52      * The callback return value will be ignored.
     53      */
     54             AAUDIO_CALLBACK_OPERATION_DISCONNECTED,
     55 };
     56 typedef int32_t aaudio_callback_operation_t;
     57 
     58 
     59 class AudioStreamLegacy : public AudioStream, public FixedBlockProcessor {
     60 public:
     61     AudioStreamLegacy();
     62 
     63     virtual ~AudioStreamLegacy();
     64 
     65     aaudio_legacy_callback_t getLegacyCallback();
     66 
     67     int32_t callDataCallbackFrames(uint8_t *buffer, int32_t numFrames);
     68 
     69     // This is public so it can be called from the C callback function.
     70     // This is called from the AudioTrack/AudioRecord client.
     71     virtual void processCallback(int event, void *info) = 0;
     72 
     73     void processCallbackCommon(aaudio_callback_operation_t opcode, void *info);
     74 
     75     // Implement FixedBlockProcessor
     76     int32_t onProcessFixedBlock(uint8_t *buffer, int32_t numBytes) override;
     77 
     78     virtual int64_t incrementClientFrameCounter(int32_t frames)  = 0;
     79 
     80 
     81     virtual int64_t getFramesWritten() override {
     82         return mFramesWritten.get();
     83     }
     84 
     85     virtual int64_t getFramesRead() override {
     86         return mFramesRead.get();
     87     }
     88 
     89 protected:
     90 
     91     class StreamDeviceCallback : public android::AudioSystem::AudioDeviceCallback
     92     {
     93     public:
     94 
     95         StreamDeviceCallback(AudioStreamLegacy *parent) : mParent(parent) {}
     96         virtual ~StreamDeviceCallback() {}
     97 
     98         virtual void onAudioDeviceUpdate(audio_io_handle_t audioIo __unused,
     99                                          audio_port_handle_t deviceId) {
    100             if (mParent != nullptr) {
    101                 mParent->onAudioDeviceUpdate(deviceId);
    102             }
    103         }
    104 
    105         AudioStreamLegacy *mParent;
    106     };
    107 
    108     aaudio_result_t getBestTimestamp(clockid_t clockId,
    109                                      int64_t *framePosition,
    110                                      int64_t *timeNanoseconds,
    111                                      android::ExtendedTimestamp *extendedTimestamp);
    112 
    113     void onAudioDeviceUpdate(audio_port_handle_t deviceId);
    114 
    115     /*
    116      * Check to see whether a callback thread has requested a disconnected.
    117      * @param errorCallbackEnabled set true to call errorCallback on disconnect
    118      * @return AAUDIO_OK or AAUDIO_ERROR_DISCONNECTED
    119      */
    120     aaudio_result_t checkForDisconnectRequest(bool errorCallbackEnabled);
    121 
    122     void forceDisconnect(bool errorCallbackEnabled = true);
    123 
    124     int64_t incrementFramesWritten(int32_t frames) {
    125         return mFramesWritten.increment(frames);
    126     }
    127 
    128     int64_t incrementFramesRead(int32_t frames) {
    129         return mFramesRead.increment(frames);
    130     }
    131 
    132     MonotonicCounter           mFramesWritten;
    133     MonotonicCounter           mFramesRead;
    134     MonotonicCounter           mTimestampPosition;
    135 
    136     FixedBlockAdapter         *mBlockAdapter = nullptr;
    137     aaudio_wrapping_frames_t   mPositionWhenStarting = 0;
    138     int32_t                    mCallbackBufferSize = 0;
    139     const android::sp<StreamDeviceCallback>   mDeviceCallback;
    140 
    141     AtomicRequestor            mRequestDisconnect;
    142 };
    143 
    144 } /* namespace aaudio */
    145 
    146 #endif //LEGACY_AUDIO_STREAM_LEGACY_H
    147