harmony 鸿蒙Using OHAudio for Audio Recording
Using OHAudio for Audio Recording
OHAudio is a set of native APIs introduced in API version 10. These APIs are normalized in design and support both common and low-latency audio channels.
Prerequisites
To use the playback or recording capability of OHAudio, you must first import the corresponding header files.
To use APIs for audio recording, import <native_audiostreambuilder.h> and <native_audiocapturer.h>.
Audio Stream Builder
OHAudio provides the OH_AudioStreamBuilder class, which complies with the builder design pattern and is used to build audio streams. You need to specify OH_AudioStream_Type based on your service scenarios.
OH_AudioStream_Type can be set to either of the following:
- AUDIOSTREAM_TYPE_RENDERER
- AUDIOSTREAM_TYPE_CAPTURER
The following code snippet shows how to use OH_AudioStreamBuilder_Create to create a builder:
OH_AudioStreamBuilder* builder;
OH_AudioStreamBuilder_Create(&builder, streamType);
After the audio service is complete, call OH_AudioStreamBuilder_Destroy to destroy the builder.
OH_AudioStreamBuilder_Destroy(builder);
How to Develop
Read OHAudio for the API reference.
The following walks you through how to implement simple recording:
Create an audio stream builder.
OH_AudioStreamBuilder* builder; OH_AudioStreamBuilder_Create(&builder, AUDIOSTREAM_TYPE_CAPTURER);Set audio stream parameters.
After creating the builder for audio recording, set the parameters required.
OH_AudioStreamBuilder_SetSamplingRate(builder, rate); OH_AudioStreamBuilder_SetChannelCount(builder, channelCount); OH_AudioStreamBuilder_SetSampleFormat(builder, format); OH_AudioStreamBuilder_SetEncodingType(builder, encodingType); OH_AudioStreamBuilder_SetCapturerInfo(builder, sourceType);Note that the audio data to record is written through callbacks. You must call OH_AudioStreamBuilder_SetCapturerCallback to implement the callbacks. For details about the declaration of the callback functions, see OH_AudioCapturer_Callbacks.
Set the callback functions.
OH_AudioStreamBuilder_SetCapturerCallback(builder, callbacks, nullptr);Create an audio capturer instance.
OH_AudioCapturer* audioCapturer; OH_AudioStreamBuilder_GenerateCapturer(builder, &audioCapturer);Use the audio capturer.
You can use the APIs listed below to control the audio streams.
|API |Description | |————————————————————|————| |OH_AudioStream_Result OH_AudioCapturer_Start(OH_AudioCapturer* capturer)|Starts the audio capturer. | |OH_AudioStream_Result OH_AudioCapturer_Pause(OH_AudioCapturer* capturer)|Pauses the audio capturer. | |OH_AudioStream_Result OH_AudioCapturer_Stop(OH_AudioCapturer* capturer)|Stops the audio capturer. | |OH_AudioStream_Result OH_AudioCapturer_Flush(OH_AudioCapturer* capturer)|Flushes obtained audio data.| |OH_AudioStream_Result OH_AudioCapturer_Release(OH_AudioCapturer* capturer)|Releases the audio capturer instance.|
Destroy the audio stream builder.
When the builder is no longer used, release related resources.
OH_AudioStreamBuilder_Destroy(builder);
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