harmony 鸿蒙开发音频通话功能

  • 2023-06-24
  • 浏览 (1047)

开发音频通话功能

在音频通话场景下，音频输出（播放对端声音）和音频输入（录制本端声音）会同时进行，应用可以通过使用AudioRenderer来实现音频输出，通过使用AudioCapturer来实现音频输入，同时使用AudioRenderer和AudioCapturer即可实现音频通话功能。

在音频通话开始和结束时，应用可以自行检查当前的音频场景模式和铃声模式，以便采取合适的音频管理及提示策略。

以下代码示范了同时使用AudioRenderer和AudioCapturer实现音频通话功能的基本过程，其中未包含音频通话数据的传输过程，实际开发中，需要将网络传输来的对端通话数据解码播放，此处仅以读取音频文件的数据代替；同时需要将本端录制的通话数据编码打包，通过网络发送给对端，此处仅以将数据写入音频文件代替。

使用AudioRenderer播放对端的通话声音

该过程与使用AudioRenderer开发音频播放功能过程相似，关键区别在于audioRendererInfo参数和音频数据来源。audioRendererInfo参数中，音频内容类型需设置为语音，CONTENT_TYPE_SPEECH，音频流使用类型需设置为语音通信，STREAM_USAGE_VOICE_COMMUNICATION。

import audio from '@ohos.multimedia.audio';
import fs from '@ohos.file.fs';
import { BusinessError } from '@ohos.base';

const TAG = 'VoiceCallDemoForAudioRenderer';
// 与使用AudioRenderer开发音频播放功能过程相似，关键区别在于audioRendererInfo参数和音频数据来源
let context = getContext(this);
let renderModel: audio.AudioRenderer|undefined = undefined;
let audioStreamInfo: audio.AudioStreamInfo = {
  samplingRate: audio.AudioSamplingRate.SAMPLE_RATE_48000, // 采样率
  channels: audio.AudioChannel.CHANNEL_2, // 通道
  sampleFormat: audio.AudioSampleFormat.SAMPLE_FORMAT_S16LE, // 采样格式
  encodingType: audio.AudioEncodingType.ENCODING_TYPE_RAW // 编码格式
}
let audioRendererInfo: audio.AudioRendererInfo = {
  // 需使用通话场景相应的参数
  content: audio.ContentType.CONTENT_TYPE_SPEECH, // 音频内容类型：语音
  usage: audio.StreamUsage.STREAM_USAGE_VOICE_COMMUNICATION, // 音频流使用类型：语音通信
  rendererFlags: 0 // 音频渲染器标志：默认为0即可
}
let audioRendererOptions: audio.AudioRendererOptions = {
  streamInfo: audioStreamInfo,
  rendererInfo: audioRendererInfo
}

// 初始化，创建实例，设置监听事件
audio.createAudioRenderer(audioRendererOptions, (err: BusinessError, renderer: audio.AudioRenderer) => { // 创建AudioRenderer实例
  if (!err) {
    console.info(`${TAG}: creating AudioRenderer success`);
    renderModel = renderer;
    if (renderModel !== undefined) {
      renderModel.on('stateChange', (state: audio.AudioState) => { // 设置监听事件，当转换到指定的状态时触发回调
        if (state == 1) {
          console.info('audio renderer state is: STATE_PREPARED');
        }
        if (state == 2) {
          console.info('audio renderer state is: STATE_RUNNING');
        }
      });
      renderModel.on('markReach', 1000, (position: number) => { // 订阅markReach事件，当渲染的帧数达到1000帧时触发回调
        if (position == 1000) {
          console.info('ON Triggered successfully');
        }
      });
    }
  } else {
    console.info(`${TAG}: creating AudioRenderer failed, error: ${err.message}`);
  }
});

// 开始一次音频渲染
async function start() {
  if (renderModel !== undefined) {
    let stateGroup: number[] = [audio.AudioState.STATE_PREPARED, audio.AudioState.STATE_PAUSED, audio.AudioState.STATE_STOPPED];
    if (stateGroup.indexOf(renderModel.state.valueOf()) === -1) { // 当且仅当状态为STATE_PREPARED、STATE_PAUSED和STATE_STOPPED之一时才能启动渲染
      console.error(TAG + 'start failed');
      return;
    }
    await renderModel.start(); // 启动渲染
    const bufferSize: number = await renderModel.getBufferSize();
    // 此处仅以读取音频文件的数据举例，实际音频通话开发中，需要读取的是通话对端传输来的音频数据

    let path = context.filesDir;

    const filePath = path + '/voice_call_data.wav'; // 沙箱路径，实际路径为/data/storage/el2/base/haps/entry/files/voice_call_data.wav
    let file = fs.openSync(filePath, fs.OpenMode.READ_ONLY);
    let stat = await fs.stat(filePath);
    let buf = new ArrayBuffer(bufferSize);
    let len = stat.size % bufferSize === 0 ? Math.floor(stat.size / bufferSize) : Math.floor(stat.size / bufferSize + 1);
    class Option {
      offset: number = 0
      length: number = 0
    }
    for (let i = 0; i < len; i++) {
      let options: Option = {
        offset: i * bufferSize,
        length: bufferSize
      };
      let readsize = await fs.read(file.fd, buf, options);
      // buf是要写入缓冲区的音频数据，在调用AudioRenderer.write()方法前可以进行音频数据的预处理，实现个性化的音频播放功能，AudioRenderer会读出写入缓冲区的音频数据进行渲染
      let writeSize: number = await renderModel.write(buf);
      if (renderModel.state.valueOf() === audio.AudioState.STATE_RELEASED) { // 如果渲染器状态为STATE_RELEASED，停止渲染
        fs.close(file);
        await renderModel.stop();
      }
      if (renderModel.state.valueOf() === audio.AudioState.STATE_RUNNING) {
        if (i === len - 1) { // 如果音频文件已经被读取完，停止渲染
          fs.close(file);
          await renderModel.stop();
        }
      }
    }
  }
}

// 暂停渲染
async function pause() {
  if (renderModel !== undefined) {
    // 只有渲染器状态为STATE_RUNNING的时候才能暂停
    if (renderModel.state.valueOf() !== audio.AudioState.STATE_RUNNING) {
      console.info('Renderer is not running');
      return;
    }
    await renderModel.pause(); // 暂停渲染
    if (renderModel.state.valueOf() === audio.AudioState.STATE_PAUSED) {
      console.info('Renderer is paused.');
    } else {
      console.error('Pausing renderer failed.');
    }
  }
}

// 停止渲染
async function stop() {
  if (renderModel !== undefined) {
    // 只有渲染器状态为STATE_RUNNING或STATE_PAUSED的时候才可以停止
    if (renderModel.state.valueOf() !== audio.AudioState.STATE_RUNNING && renderModel.state.valueOf() !== audio.AudioState.STATE_PAUSED) {
      console.info('Renderer is not running or paused.');
      return;
    }
    await renderModel.stop(); // 停止渲染
    if (renderModel.state.valueOf() === audio.AudioState.STATE_STOPPED) {
      console.info('Renderer stopped.');
    } else {
      console.error('Stopping renderer failed.');
    }
  }
}

// 销毁实例，释放资源
async function release() {
  if (renderModel !== undefined) {
    // 渲染器状态不是STATE_RELEASED状态，才能release
    if (renderModel.state.valueOf() === audio.AudioState.STATE_RELEASED) {
      console.info('Renderer already released');
      return;
    }
    await renderModel.release(); // 释放资源
    if (renderModel.state.valueOf() === audio.AudioState.STATE_RELEASED) {
      console.info('Renderer released');
    } else {
      console.error('Renderer release failed.');
    }
  }
}

使用AudioCapturer录制本端的通话声音

该过程与使用AudioCapturer开发音频录制功能过程相似，关键区别在于audioCapturerInfo参数和音频数据流向。audioCapturerInfo参数中音源类型需设置为语音通话，SOURCE_TYPE_VOICE_COMMUNICATION。

import audio from '@ohos.multimedia.audio';
import fs from '@ohos.file.fs';
import { BusinessError } from '@ohos.base';

let context = getContext(this);
const TAG = 'VoiceCallDemoForAudioCapturer';
// 与使用AudioCapturer开发音频录制功能过程相似，关键区别在于audioCapturerInfo参数和音频数据流向
let audioCapturer: audio.AudioCapturer|undefined = undefined;
let audioStreamInfo: audio.AudioStreamInfo = {
  samplingRate: audio.AudioSamplingRate.SAMPLE_RATE_44100, // 采样率
  channels: audio.AudioChannel.CHANNEL_1, // 通道
  sampleFormat: audio.AudioSampleFormat.SAMPLE_FORMAT_S16LE, // 采样格式
  encodingType: audio.AudioEncodingType.ENCODING_TYPE_RAW // 编码格式
}
let audioCapturerInfo: audio.AudioCapturerInfo = {
  // 需使用通话场景相应的参数
  source: audio.SourceType.SOURCE_TYPE_VOICE_COMMUNICATION, // 音源类型：语音通话
  capturerFlags: 0 // 音频采集器标志：默认为0即可
}
let audioCapturerOptions: audio.AudioCapturerOptions = {
  streamInfo: audioStreamInfo,
  capturerInfo: audioCapturerInfo
}

// 初始化，创建实例，设置监听事件
async function init() {
  audio.createAudioCapturer(audioCapturerOptions, (err: BusinessError, capturer: audio.AudioCapturer) => { // 创建AudioCapturer实例
    if (err) {
      console.error(`Invoke createAudioCapturer failed, code is ${err.code}, message is ${err.message}`);
      return;
    }
    console.info(`${TAG}: create AudioCapturer success`);
    audioCapturer = capturer;
    if (audioCapturer !== undefined) {
      audioCapturer.on('markReach', 1000, (position: number) => { // 订阅markReach事件，当采集的帧数达到1000时触发回调
        if (position === 1000) {
          console.info('ON Triggered successfully');
        }
      });
      audioCapturer.on('periodReach', 2000, (position: number) => { // 订阅periodReach事件，当采集的帧数达到2000时触发回调
        if (position === 2000) {
          console.info('ON Triggered successfully');
        }
      });
    }
  });
}

// 开始一次音频采集
async function start() {
  if (audioCapturer !== undefined) {
    let stateGroup: number[] = [audio.AudioState.STATE_PREPARED, audio.AudioState.STATE_PAUSED, audio.AudioState.STATE_STOPPED];
    if (stateGroup.indexOf(audioCapturer.state.valueOf()) === -1) { // 当且仅当状态为STATE_PREPARED、STATE_PAUSED和STATE_STOPPED之一时才能启动采集
      console.error(`${TAG}: start failed`);
      return;
    }
    await audioCapturer.start(); // 启动采集
    // 此处仅以将音频数据写入文件举例，实际音频通话开发中，需要将本端采集的音频数据编码打包，通过网络发送给通话对端
    const path = context.filesDir + '/voice_call_data.wav'; // 采集到的音频文件存储路径
    let file = fs.openSync(path, 0o2|0o100); // 如果文件不存在则创建文件
    let fd = file.fd;
    let numBuffersToCapture = 150; // 循环写入150次
    let count = 0;
    class Options {
      offset: number = 0
      length: number = 0
    }
    while (numBuffersToCapture) {
      let bufferSize: number = await audioCapturer.getBufferSize();
      let buffer: ArrayBuffer = await audioCapturer.read(bufferSize, true);
      let options: Options = {
        offset: count * bufferSize,
        length: bufferSize
      };
      if (buffer === undefined) {
        console.error(`${TAG}: read buffer failed`);
      } else {
        let number = fs.writeSync(fd, buffer, options);
        console.info(`${TAG}: write date: ${number}`);
      }
      numBuffersToCapture--;
      count++;
    }
  }
}

// 停止采集
async function stop() {
  if (audioCapturer !== undefined) {
    // 只有采集器状态为STATE_RUNNING或STATE_PAUSED的时候才可以停止
    if (audioCapturer.state.valueOf() !== audio.AudioState.STATE_RUNNING && audioCapturer.state.valueOf() !== audio.AudioState.STATE_PAUSED) {
      console.info('Capturer is not running or paused');
      return;
    }
    await audioCapturer.stop(); // 停止采集
    if (audioCapturer.state.valueOf() === audio.AudioState.STATE_STOPPED) {
      console.info('Capturer stopped');
    } else {
      console.error('Capturer stop failed');
    }
  }
}

// 销毁实例，释放资源
async function release() {
  if (audioCapturer !== undefined) {
    // 采集器状态不是STATE_RELEASED或STATE_NEW状态，才能release
    if (audioCapturer.state.valueOf() === audio.AudioState.STATE_RELEASED||audioCapturer.state.valueOf() === audio.AudioState.STATE_NEW) {
      console.info('Capturer already released');
      return;
    }
    await audioCapturer.release(); // 释放资源
    if (audioCapturer.state.valueOf() === audio.AudioState.STATE_RELEASED) {
      console.info('Capturer released');
    } else {
      console.error('Capturer release failed');
    }
  }
}

相关实例

针对音频通话开发，有以下相关实例可供参考：

你可能感兴趣的鸿蒙文章

harmony 鸿蒙媒体

harmony 鸿蒙音频通话开发概述

harmony 鸿蒙音频解码

harmony 鸿蒙音效管理

harmony 鸿蒙音频编码

harmony 鸿蒙音频输入设备管理

harmony 鸿蒙音频输出设备管理

harmony 鸿蒙多音频播放的并发策略

harmony 鸿蒙音频播放开发概述

harmony 鸿蒙音频播放流管理

0  赞
  • 所属分类： 后端技术
  • 本文标签：
  • 版权声明： 原创文章如转载，请注明本文链接: https://www.seaxiang.com/blog/e050a86627094e86b41f6a4650c0d1dd
热门推荐
标签云
Linux Java Spring Spring Boot docker 大数据 前端 生活 maven golang 软件 spring cloud fintech mac vscode 其他 区块链 以太坊 V神 开发者 技术 股票 git greenplum 分布式事务 chrome mysql flink kafka 设计模式 原理 鸿蒙 seo
最新文章
本文目录