You can use the APIs provided by **AudioCapturer** to record raw audio files.
You can use the APIs provided by **AudioCapturer** to record raw audio files, thereby implementing audio data collection.
### State Check
**Status check**: During application development, you are advised to use **on('stateChange')** to subscribe to state changes of the **AudioCapturer** instance. This is because some operations can be performed only when the audio capturer is in a given state. If the application performs an operation when the audio capturer is not in the given state, the system may throw an exception or generate other undefined behavior.
During application development, you are advised to use **on('stateChange')** to subscribe to state changes of the **AudioCapturer** instance. This is because some operations can be performed only when the audio capturer is in a given state. If the application performs an operation when the audio capturer is not in the given state, the system may throw an exception or generate other undefined behavior.
## Working Principles
For details about the APIs, see [AudioCapturer in Audio Management](../reference/apis/js-apis-audio.md#audiocapturer8).
This following figure shows the audio capturer state transitions.
-**PREPARED**: The audio capturer enters this state by calling **create()**.
-**RUNNING**: The audio capturer enters this state by calling **start()** when it is in the **PREPARED** state or by calling **start()** when it is in the **STOPPED** state.
-**STOPPED**: The audio capturer in the **RUNNING** state can call **stop()** to stop playing audio data.
-**RELEASED**: The audio capturer in the **PREPARED** or **STOPPED** state can use **release()** to release all occupied hardware and software resources. It will not transit to any other state after it enters the **RELEASED** state.
**Figure 1** Audio capturer state
## Constraints
Before developing the audio data collection feature, configure the **ohos.permission.MICROPHONE** permission for your application. For details about permission configuration, see [Permission Application Guide](../security/accesstoken-guidelines.md).
## How to Develop
## How to Develop
For details about the APIs, see [AudioCapturer in Audio Management](../reference/apis/js-apis-audio.md#audiocapturer8).
1. Use **createAudioCapturer()** to create an **AudioCapturer** instance.
1. Use **createAudioCapturer()** to create an **AudioCapturer** instance.
Set parameters of the **AudioCapturer** instance in **audioCapturerOptions**. This instance is used to capture audio, control and obtain the recording status, and register a callback for notification.
Set parameters of the **AudioCapturer** instance in **audioCapturerOptions**. This instance is used to capture audio, control and obtain the recording state, and register a callback for notification.
2. (Optional) Use **on('stateChange')** to subscribe to audio renderer state changes.
If an application needs to perform some operations when the audio renderer state is updated, the application can subscribe to the state changes. For more events that can be subscribed to, see [Audio Management](../reference/apis/js-apis-audio.md).
```js
audioCapturer.on('stateChange',(state)=>{
console.info('AudioCapturerLog: Changed State to : '+state)
switch(state){
caseaudio.AudioState.STATE_PREPARED:
console.info('--------CHANGE IN AUDIO STATE----------PREPARED--------------');
console.info('Audio State is : Prepared');
break;
caseaudio.AudioState.STATE_RUNNING:
console.info('--------CHANGE IN AUDIO STATE----------RUNNING--------------');
console.info('Audio State is : Running');
break;
caseaudio.AudioState.STATE_STOPPED:
console.info('--------CHANGE IN AUDIO STATE----------STOPPED--------------');
console.info('Audio State is : stopped');
break;
caseaudio.AudioState.STATE_RELEASED:
console.info('--------CHANGE IN AUDIO STATE----------RELEASED--------------');
console.info('Audio State is : released');
break;
default:
console.info('--------CHANGE IN AUDIO STATE----------INVALID--------------');
console.info('Audio State is : invalid');
break;
}
});
```
```
3. Use **start()** to start audio recording.
2. Use **start()** to start audio recording.
The capturer state will be **STATE_RUNNING** once the audio capturer is started. The application can then begin reading buffers.
The capturer state will be **STATE_RUNNING** once the audio capturer is started. The application can then begin reading buffers.
```js
```js
importaudiofrom'@ohos.multimedia.audio';
asyncfunctionstartCapturer(){
letstate=audioCapturer.state;
// The audio capturer should be in the STATE_PREPARED, STATE_PAUSED, or STATE_STOPPED state after being started.
4. Use **getBufferSize()** to obtain the minimum buffer size to read.
3. Read the captured audio data and convert it to a byte stream. Call **read()** repeatedly to read the data until the application stops the recording.
5. Read the captured audio data and convert it to a byte stream. Call **read()** repeatedly to read the data until the application wants to stop the recording.
The following example shows how to write recorded data into a file.
The following example shows how to write recorded data into a file.
```js
```js
importfileiofrom'@ohos.fileio';
importfileiofrom'@ohos.fileio';
constpath='/data/data/.pulse_dir/capture_js.wav';
letstate=audioCapturer.state;
// The read operation can be performed only when the state is STATE_RUNNING.
if(state!=audio.AudioState.STATE_RUNNING){
console.info('Capturer is not in a correct state to read');
return;
}
constpath='/data/data/.pulse_dir/capture_js.wav';// Path for storing the collected audio file.
letfd=fileio.openSync(path,0o102,0o777);
letfd=fileio.openSync(path,0o102,0o777);
if(fd!==null){
if(fd!==null){
console.info('AudioRecLog: file fd created');
console.info('AudioRecLog: file fd created');
...
@@ -115,38 +110,140 @@ If an application needs to perform some operations when the audio renderer state
...
@@ -115,38 +110,140 @@ If an application needs to perform some operations when the audio renderer state
console.info('AudioRecLog: file fd opened in append mode');
console.info('AudioRecLog: file fd opened in append mode');
}
}
varnumBuffersToCapture=150;
letnumBuffersToCapture=150;// Write data for 150 times.
7. (Optional) Use **on('markReach')** to subscribe to the mark reached event, and use **off('markReach')** to unsubscribe from the event.
After the mark reached event is subscribed to, when the number of frames collected by the audio capturer reaches the specified value, a callback is triggered and the specified value is returned.
audioCapturer.off('markReach');// Unsubscribe from the mark reached event. This event will no longer be listened for.
```
8. (Optional) Use **on('periodReach')** to subscribe to the period reached event, and use **off('periodReach')** to unsubscribe from the event.
After the period reached event is subscribed to, each time the number of frames collected by the audio capturer reaches the specified value, a callback is triggered and the specified value is returned.
```js
audioCapturer.on('periodReach',(reachNumber)=>{
console.info('Period reach event Received');
console.info(`In this period, the Capturer reached frame: ${reachNumber}`);
});
audioCapturer.off('periodReach');// Unsubscribe from the period reached event. This event will no longer be listened for.
```
9. If your application needs to perform some operations when the audio capturer state is updated, it can subscribe to the state change event. When the audio capturer state is updated, the application receives a callback containing the event type.
```js
audioCapturer.on('stateChange', (state) => {
console.info(`AudioCapturerLog: Changed State to : ${state}`)
switch (state) {
case audio.AudioState.STATE_PREPARED:
console.info('--------CHANGE IN AUDIO STATE----------PREPARED--------------');
console.info('Audio State is : Prepared');
break;
case audio.AudioState.STATE_RUNNING:
console.info('--------CHANGE IN AUDIO STATE----------RUNNING--------------');
console.info('Audio State is : Running');
break;
case audio.AudioState.STATE_STOPPED:
console.info('--------CHANGE IN AUDIO STATE----------STOPPED--------------');
console.info('Audio State is : stopped');
break;
case audio.AudioState.STATE_RELEASED:
console.info('--------CHANGE IN AUDIO STATE----------RELEASED--------------');
console.info('Audio State is : released');
break;
default:
console.info('--------CHANGE IN AUDIO STATE----------INVALID--------------');
The audio interruption mode is used to control the playback of multiple audio streams.<br>
The audio interruption mode is used to control the playback of multiple audio streams.
Audio applications can set the audio interruption mode to independent or shared under **AudioRenderer**.<br>
In shared mode, multiple audio streams share one session ID. In independent mode, each audio stream has an independent session ID.
Audio applications can set the audio interruption mode to independent or shared under **AudioRenderer**.
### Asynchronous Operations
In shared mode, multiple audio streams share one session ID. In independent mode, each audio stream has an independent session ID.
To prevent the UI thread from being blocked, most **AudioRenderer** calls are asynchronous. Each API provides the callback and promise functions. The following examples use the promise functions.
**Asynchronous operation**: To prevent the UI thread from being blocked, most **AudioRenderer** calls are asynchronous. Each API provides the callback and promise functions. The following examples use the promise functions.
## How to Develop
## How to Develop
For details about the APIs, see [AudioRenderer in Audio Management](../reference/apis/js-apis-audio.md#audiorenderer8).
For details about the APIs, see [AudioRenderer in Audio Management](../reference/apis/js-apis-audio.md#audiorenderer8).
1. Use **createAudioRenderer()** to create an **AudioRenderer** instance.
1. Use **createAudioRenderer()** to create an **AudioRenderer** instance.<br>
Set parameters of the **AudioRenderer** instance in **audioRendererOptions**.
Set parameters of the **AudioRenderer** instance in **audioRendererOptions**.<br>
This instance is used to render audio, control and obtain the rendering status, and register a callback for notification.<br>
```js
This instance is used to render audio, control and obtain the rendering status, and register a callback for notification.
```js
importaudiofrom'@ohos.multimedia.audio';
importaudiofrom'@ohos.multimedia.audio';
varaudioStreamInfo={
varaudioStreamInfo={
...
@@ -39,7 +40,7 @@ For details about the APIs, see [AudioRenderer in Audio Management](../reference
...
@@ -39,7 +40,7 @@ For details about the APIs, see [AudioRenderer in Audio Management](../reference
**AudioRenderer** provides APIs for rendering audio files and controlling playback. It also supports audio interruption. You can use the APIs provided by **AudioRenderer** to play audio files in output devices and manage playback tasks.
**AudioRenderer** provides APIs for rendering audio files and controlling playback. It also supports audio interruption. You can use the APIs provided by **AudioRenderer** to play audio files in output devices and manage playback tasks.
### Audio Interruption
Before calling the APIs, be familiar with the following terms:
When an audio stream with a higher priority needs to be played, the audio renderer interrupts the stream with a lower priority. For example, if a call comes in when the user is listening to music, the music playback, which is the lower priority stream, is paused. For details, see [How to Develop](#how-to-develop).
-**Audio interruption**: When an audio stream with a higher priority needs to be played, the audio renderer interrupts the stream with a lower priority. For example, if a call comes in when the user is listening to music, the music playback, which is the lower priority stream, is paused.
-**Status check**: During application development, you are advised to use **on('stateChange')** to subscribe to state changes of the **AudioRenderer** instance. This is because some operations can be performed only when the audio renderer is in a given state. If the application performs an operation when the audio renderer is not in the given state, the system may throw an exception or generate other undefined behavior.
-**Asynchronous operation**: To prevent the UI thread from being blocked, most **AudioRenderer** calls are asynchronous. Each API provides the callback and promise functions. The following examples use the promise functions. For more information, see [AudioRenderer in Audio Management](../reference/apis/js-apis-audio.md#audiorenderer8).
-**Audio interruption mode**: OpenHarmony provides two audio interruption modes: **shared mode** and **independent mode**. In shared mode, all **AudioRenderer** instances created by the same application share one focus object, and there is no focus transfer inside the application. Therefore, no callback will be triggered. In independent mode, each **AudioRenderer** instance has an independent focus object, and focus preemption occurs. Focus preemption triggers focus transfer, and the **AudioRenderer** instance that originally has the focus receives a notification through the callback. By default, the shared mode is used. You can call **setInterruptMode()** to set the independent mode.
### State Check
## Working Principles
During application development, you are advised to use **on('stateChange')** to subscribe to state changes of the **AudioRenderer** instance. This is because some operations can be performed only when the audio renderer is in a given state. If the application performs an operation when the audio renderer is not in the given state, the system may throw an exception or generate other undefined behavior.
The following figure shows the audio renderer state transitions.
-**PREPARED**: The audio renderer enters this state by calling **create()**.
-**RUNNING**: The audio renderer enters this state by calling **start()** when it is in the **PREPARED** state or by calling **start()** when it is in the **STOPPED** state.
To ensure that the UI thread is not blocked, most **AudioRenderer** calls are asynchronous. Each API provides the callback and promise functions. The following examples use the promise functions. For more information, see [AudioRenderer in Audio Management](../reference/apis/js-apis-audio.md#audiorenderer8).
-**PAUSED**: The audio renderer in the **RUNNING** state can call **pause()** to pause the audio playback. After the audio playback is paused, it can call **start()** to resume the playback.
-**STOPPED**: The audio renderer in the **PAUSED** or **RUNNING** state can call **stop()** to stop the playback.
-**RELEASED**: The audio renderer in the **PREPARED**, **PAUSED**, or **STOPPED** state can use **release()** to release all occupied hardware and software resources. It will not transit to any other state after it enters the **RELEASED** state.
## How to Develop
## How to Develop
For details about the APIs, see [AudioRenderer in Audio Management](../reference/apis/js-apis-audio.md#audiorenderer8).
1. Use **createAudioRenderer()** to create an **AudioRenderer** instance.
1. Use **createAudioRenderer()** to create an **AudioRenderer** instance.
Set parameters of the audio renderer in **audioCapturerOptions**. This instance is used to render audio, control and obtain the rendering status, and register a callback for notification.
Set parameters of the **AudioRenderer** instance in **audioRendererOptions**. This instance is used to render audio, control and obtain the rendering status, and register a callback for notification.
2. Use **on('interrupt')** to subscribe to audio interruption events.
2. Use **start()** to start audio rendering.
Stream-A is interrupted when Stream-B with a higher or equal priority requests to become active and use the output device.
In some cases, the audio renderer performs forcible operations such as pausing and ducking, and notifies the application through **InterruptEvent**. In other cases, the application can choose to act on the **InterruptEvent** or ignore it.
In the case of audio interruption, the application may encounter write failures. To avoid such failures, interruption unaware applications can use **audioRenderer.state** to check the renderer state before writing audio data. The applications can obtain more details by subscribing to the audio interruption events. For details, see [InterruptEvent](../reference/apis/js-apis-audio.md#interruptevent9).
letdir=globalThis.fileDir;// You must use the sandbox path.
constpath=dir+'/file_example_WAV_2MG.wav';// The file to render is in the following path: /data/storage/el2/base/haps/entry/files/file_example_WAV_2MG.wav
9. (Optional) Use **on('audioInterrupt')** to subscribe to the audio interruption event, and use **off('audioInterrupt')** to unsubscribe from the event.
Audio interruption means that Stream A will be interrupted when Stream B with a higher or equal priority requests to become active and use the output device.
In some cases, the audio renderer performs forcible operations such as pausing and ducking, and notifies the application through **InterruptEvent**. In other cases, the application can choose to act on the **InterruptEvent** or ignore it.
In the case of audio interruption, the application may encounter write failures. To avoid such failures, interruption-unaware applications can use **audioRenderer.state** to check the audio renderer state before writing audio data. The applications can obtain more details by subscribing to the audio interruption events. For details, see [InterruptEvent](../reference/apis/js-apis-audio.md#interruptevent9).
It should be noted that the audio interruption event subscription of the **AudioRenderer** module is slightly different from **on('interrupt')** in [AudioManager](../reference/apis/js-apis-audio.md#audiomanager). The **on('interrupt')** and **off('interrupt')** APIs are deprecated since API version 9. In the **AudioRenderer** module, you only need to call **on('audioInterrupt')** to listen for focus change events. When the **AudioRenderer** instance created by the application performs actions such as start, stop, and pause, it requests the focus, which triggers focus transfer and in return enables the related **AudioRenderer** instance to receive a notification through the callback. For instances other than **AudioRenderer**, such as frequency modulation (FM) and voice wakeup, the application does not create an instance. In this case, the application can call **on('interrupt')** in **AudioManager** to receive a focus change notification.
// Notify the application that the rendering starts.
caseaudio.InterruptHint.INTERRUPT_HINT_RESUME:
startRenderer();
break;
// Notify the application that the audio stream is interrupted. The application determines whether to continue. (In this example, the application pauses the rendering.)
caseaudio.InterruptHint.INTERRUPT_HINT_PAUSE:
isPlay=false;
pauseRenderer();
break;
}
}
});
audioRenderer.off('audioInterrupt');// Unsubscribe from the audio interruption event. This event will no longer be received.
```
10. (Optional) Use **on('markReach')** to subscribe to the mark reached event, and use **off('markReach')** to unsubscribe from the event.
After the mark reached event is subscribed to, when the number of frames rendered by the audio renderer reaches the specified value, a callback is triggered and the specified value is returned.
audioRenderer.off('markReach');// Unsubscribe from the mark reached event. This event will no longer be listened for.
```
11. (Optional) Use **on('periodReach')** to subscribe to the period reached event, and use **off('periodReach')** to unsubscribe from the event.
After the period reached event is subscribed to, each time the number of frames rendered by the audio renderer reaches the specified value, a callback is triggered and the specified value is returned.
```js
audioRenderer.on('periodReach',(reachNumber)=>{
console.info('Period reach event Received');
console.info(`In this period, the renderer reached frame: ${reachNumber} `);
});
audioRenderer.off('periodReach');// Unsubscribe from the period reached event. This event will no longer be listened for.
```
12. (Optional) Use **on('stateChange')** to subscribe to audio renderer state changes.
After the **stateChange** event is subscribed to, when the audio renderer state changes, a callback is triggered and the audio renderer state is returned.
```js
audioRenderer.on('stateChange',(audioState)=>{
console.info('State change event Received');
console.info(`Current renderer state is: ${audioState}`);
});
```
13. (Optional) Handle exceptions of **on()**.
If the string or the parameter type passed in **on()** is incorrect , the application throws an exception. In this case, you can use **try catch** to capture the exception.
```js
try{
audioRenderer.on('invalidInput',()=>{// The string does not match.
})
}catch(err){
console.info(`Call on function error, ${err}`);// The application throws exception 401.
}
try{
audioRenderer.on(1,()=>{// The type of the input parameter is incorrect.
})
}catch(err){
console.info(`Call on function error, ${err}`);// The application throws exception 6800101.
}
```
14. (Optional) Refer to the complete example of **on('audioInterrupt')**.
Create **AudioRender1** and **AudioRender2** in an application, configure the independent interruption mode, and call **on('audioInterrupt')** to subscribe to audio interruption events. At the beginning, **AudioRender1** has the focus. When **AudioRender2** attempts to obtain the focus, **AudioRenderer1** receives a focus transfer notification and the related log information is printed. If the shared mode is used, the log information will not be printed during application running.
letdir=globalThis.fileDir;// You must use the sandbox path.
constpath1=dir+'/music001_48000_32_1.wav';// The file to render is in the following path: /data/storage/el2/base/haps/entry/files/music001_48000_32_1.wav
console.info(`audioRender1 file path: ${path1}`);
letss1=awaitfileio.createStream(path1,'r');
consttotalSize1=fileio.statSync(path1).size;// Size of the file to render.
letdir=globalThis.fileDir;// You must use the sandbox path.
constpath2=dir+'/music002_48000_32_1.wav';// The file to render is in the following path: /data/storage/el2/base/haps/entry/files/music002_48000_32_1.wav
You can use **AudioStreamManager** to manage audio streams.
You can use **AudioStreamManager** to manage audio streams.
### Development Process
## Working Principles
During application development, use **getStreamManager()** to create an **AudioStreamManager** instance. Then, you can call **on('audioRendererChange')** or **on('audioCapturerChange')** to listen for status, client, and audio attribute changes of the audio playback or recording application. To cancel the listening for these changes, call **off('audioRendererChange')** or **off('audioCapturerChange')**. You can call **getCurrentAudioRendererInfoArray()** to obtain information about the audio playback application, such as the unique audio stream ID, UID of the audio playback client, and audio status. Similarly, you can call **getCurrentAudioCapturerInfoArray()** to obtain information about the audio recording application. The figure below shows the invoking relationship.
The following figure shows the calling relationship of **AudioStreamManager** APIs.
For details about the APIs, see [AudioStreamManager](../reference/apis/js-apis-audio.md#audiostreammanager9).
**Figure 1** AudioStreamManager API calling relationship
**NOTE**: During application development, use **getStreamManager()** to create an **AudioStreamManager** instance. Then, you can call **on('audioRendererChange')** or **on('audioCapturerChange')** to listen for status, client, and audio attribute changes of the audio playback or recording application. To cancel the listening for these changes, call **off('audioRendererChange')** or **off('audioCapturerChange')**. You can call **getCurrentAudioRendererInfoArray()** to obtain information about the audio playback application, such as the unique audio stream ID, UID of the audio playback client, and audio status. Similarly, you can call **getCurrentAudioCapturerInfoArray()** to obtain information about the audio recording application.
## How to Develop
## How to Develop
For details about the APIs, see [AudioStreamManager](../reference/apis/js-apis-audio.md#audiostreammanager9).
1. Create an **AudioStreamManager** instance.
1. Create an **AudioStreamManager** instance.
Before using **AudioStreamManager** APIs, you must use **getStreamManager()** to create an **AudioStreamManager** instance.
Before using **AudioStreamManager** APIs, you must use **getStreamManager()** to create an **AudioStreamManager** instance.
2. (Optional) Call **on('audioRendererChange')** to listen for audio renderer changes.
2. (Optional) Call **on('audioRendererChange')** to listen for audio renderer changes.
If an application needs to receive notifications when the audio playback application status, audio playback client, or audio attribute changes, it can subscribe to this event. For more events that can be subscribed to, see [Audio Management](../reference/apis/js-apis-audio.md).
If an application needs to receive notifications when the audio playback application status, audio playback client, or audio attribute changes, it can subscribe to this event. For more events that can be subscribed to, see [Audio Management](../reference/apis/js-apis-audio.md).
@@ -61,7 +65,8 @@ If an application needs to receive notifications when the audio playback applica
...
@@ -61,7 +65,8 @@ If an application needs to receive notifications when the audio playback applica
```
```
4. (Optional) Call **on('audioCapturerChange')** to listen for audio capturer changes.
4. (Optional) Call **on('audioCapturerChange')** to listen for audio capturer changes.
If an application needs to receive notifications when the audio recording application status, audio recording client, or audio attribute changes, it can subscribe to this event. For more events that can be subscribed to, see [Audio Management](../reference/apis/js-apis-audio.md).
If an application needs to receive notifications when the audio recording application status, audio recording client, or audio attribute changes, it can subscribe to this event. For more events that can be subscribed to, see [Audio Management](../reference/apis/js-apis-audio.md).
@@ -94,7 +99,8 @@ If an application needs to receive notifications when the audio recording applic
...
@@ -94,7 +99,8 @@ If an application needs to receive notifications when the audio recording applic
```
```
6. (Optional) Call **getCurrentAudioRendererInfoArray()** to obtain information about the current audio renderer.
6. (Optional) Call **getCurrentAudioRendererInfoArray()** to obtain information about the current audio renderer.
This API can be used to obtain the unique ID of the audio stream, UID of the audio playback client, audio status, and other information about the audio player. Before calling this API, a third-party application must have the **ohos.permission.USE_BLUETOOTH** permission configured, for the device name and device address to be displayed correctly.
This API can be used to obtain the unique ID of the audio stream, UID of the audio playback client, audio status, and other information about the audio player. Before calling this API, a third-party application must have the **ohos.permission.USE_BLUETOOTH** permission configured, for the device name and device address to be displayed correctly.
@@ -127,7 +133,7 @@ This API can be used to obtain the unique ID of the audio stream, UID of the aud
...
@@ -127,7 +133,7 @@ This API can be used to obtain the unique ID of the audio stream, UID of the aud
```
```
7. (Optional) Call **getCurrentAudioCapturerInfoArray()** to obtain information about the current audio capturer.
7. (Optional) Call **getCurrentAudioCapturerInfoArray()** to obtain information about the current audio capturer.
This API can be used to obtain the unique ID of the audio stream, UID of the audio recording client, audio status, and other information about the audio capturer. Before calling this API, a third-party application must have the **ohos.permission.USE_BLUETOOTH** permission configured, for the device name and device address to be displayed correctly.
This API can be used to obtain the unique ID of the audio stream, UID of the audio recording client, audio status, and other information about the audio capturer. Before calling this API, a third-party application must have the **ohos.permission.USE_BLUETOOTH** permission configured, for the device name and device address to be displayed correctly.
You can use OpenSL ES to develop the audio recording function in OpenHarmony. Currently, only some [OpenSL ES APIs](https://gitee.com/openharmony/third_party_opensles/blob/master/api/1.0.1/OpenSLES.h) are implemented. If an API that has not been implemented is called, **SL_RESULT_FEATURE_UNSUPPORTED** will be returned.
You can use OpenSL ES to develop the audio recording function in OpenHarmony. Currently, only some [OpenSL ES APIs](https://gitee.com/openharmony/third_party_opensles/blob/master/api/1.0.1/OpenSLES.h) are implemented. If an API that has not been implemented is called, **SL_RESULT_FEATURE_UNSUPPORTED** will be returned.
You can use OpenSL ES to develop the audio playback function in OpenHarmony. Currently, only some [OpenSL ES APIs](https://gitee.com/openharmony/third_party_opensles/blob/master/api/1.0.1/OpenSLES.h) are implemented. If an API that has not been implemented is called, **SL_RESULT_FEATURE_UNSUPPORTED** will be returned.
You can use OpenSL ES to develop the audio playback function in OpenHarmony. Currently, only some [OpenSL ES APIs](https://gitee.com/openharmony/third_party_opensles/blob/master/api/1.0.1/OpenSLES.h) are implemented. If an API that has not been implemented is called, **SL_RESULT_FEATURE_UNSUPPORTED** will be returned.
...
@@ -58,7 +58,7 @@ To use OpenSL ES to develop the audio playback function in OpenHarmony, perform
...
@@ -58,7 +58,7 @@ To use OpenSL ES to develop the audio playback function in OpenHarmony, perform
5. Obtain the **bufferQueueItf** instance of the **SL_IID_OH_BUFFERQUEUE** interface.
5. Obtain the **bufferQueueItf** instance of the **SL_IID_OH_BUFFERQUEUE** interface.
