Transcribe简介
语音识别技术，也被称为自动语音识别（Automatic Speech Recognition，简称ASR），其目标是将人类的语音中的词汇内容转换为计算机可读的输入，例如按键、二进制编码或者字符序列。语音识别技术已经发展了几十年，直到2009年，Hinton把人工智能深度学习解决方案引入语音识别中，语音识别才取得了巨大突破。
Amazon Transcribe 是一项自动语音识别 (ASR) 服务，使开发人员能够轻松地为其应用程序添加语音转文本功能。自从在 re:Invent 2017 发布以来，越来越多的用户将语音识别功能添加到其应用程序和设备中。2019年8月，Amazon Transcribe推出对中文普通话的支持。更加另用户兴奋的是，在中国的北京区域（BJS）和宁夏区域（ZHY）也已支持该项服务。
在日常工作学习中，我们往往需要对一个视频文件增加字幕。传统的方法需要将视频中的对话用文字记录下来，通常采用记事本等工具保存文字记录，然后借助一些工具软件为文字加上时间轴，然后进行人工校对，整个过程需要耗费大量的时间和精力。是否有更快捷的方法呢？下面我们分享一个使用Amazon Transcribe为视频自动增加字幕的示例。
AWS Transcribe 服务于利用机器学习来识别语音文件中的声音，然后将其转化为文本。目前支持英语和西班牙文语音。必须将语音文件保存在S3中，输出结果也会被保存在S3中。
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输入声音文件，支持 flac、mp3、mp4 和 wav 文件格式。长度不能超过2小时。
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指定语言。
几个特色功能：
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发音者识别（speaker identification）：Transcribe 能区别一个语音文件中的多个说话者。支持2到10个发音者
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支持多声道（channel identification）: 如果声音文件中有多声道
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支持字典（vocabulary）：比如不能识别的单词，特定领域不常用的单词
体系架构
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监测到S3存储桶中的文件变化，触发lambda函数；
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lambda函数调用Transcribe服务，生成视频对应的文本（json格式）；
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对文本进行格式转换，生成字幕文件格式（srt）；
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上传字幕文件到存储桶。
控制台操作展示
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登录自己的AWS账号进入到aws控制管理台， 然后搜索 Transcribe 进入到这个管理后台
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点击 Create job 按钮就可以使用AWS的语音转文本服务，根据提示添加必备的参数设置
api接口
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StartTranscriptionJob：开始一个转换任务
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ListTranscriptionJobs：获取任务列表
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GetTranscriptionJob：获取任务
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CreateVocabulary：创建字典
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DeleteVocabulary：删除字典
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GetVocabulary：获取字典
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ListVocabularies：获取字典列表
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UpdateVocabulary：上传字典
python使用Transcribe演示实例
类型1
import time
import boto3
transcribe = boto3.client(('transcribe'))
job_name = "testTranscribeJob100"
job_uri = "https://s3.dualstack.us-east-1.amazonaws.com/*****/hellosammy.mp3"
transcribe.start_transcription_job(TranscriptionJobName=job_name, Media={'MediaFileUri': job_uri}, MediaFormat='mp3', LanguageCode='en-US')
while True:
status = transcribe.get_transcription_job(TranscriptionJobName = job_name)
if status['TranscriptionJob']['TranscriptionJobStatus'] in ['COMPLETED', "FAILED"]:
break
print("Job not ready yet...")
time.sleep(5)
print(status)类型2
-
安装 Python 的程序包
pip3 install boto3
pip3 install amazon_transcribe
pip3 install websocket-client-
import 部分
import hashlib
import hmac
import urllib.parse
from datetime import datetime
import time
import ssl
import json
import websocket
import _thread
from amazon_transcribe.eventstream import EventStreamMessageSerializer
from amazon_transcribe.eventstream import EventStreamBuffer
from boto3.session import Session-
创建URL 函数
def sign(key, msg):
return hmac.new(key, msg.encode("utf-8"), hashlib.sha256).digest()
def getSignatureKey(key, dateStamp, region, serviceName):
kDate = sign(("AWS4" + key).encode("utf-8"), dateStamp)
kRegion = sign(kDate, region)
kService = sign(kRegion, serviceName)
kSigning = sign(kService, "aws4_request")
return kSigning
def create_pre_signed_url(region, language_code, media_encoding, sample_rate):
# 获得access key和secret key
credentials = Session().get_credentials()
access_key_id = credentials.access_key
secret_access_key = credentials.secret_key
method = "GET"
service = "transcribe"
endpoint = "wss://transcribestreaming." + region + ".amazonaws.com:8443"
host = "transcribestreaming." + region + ".amazonaws.com:8443"
algorithm = "AWS4-HMAC-SHA256"
t = datetime.utcnow()
amz_date =t.strftime('%Y%m%dT%H%M%SZ')
datestamp =t.strftime('%Y%m%d')
canonical_uri = "/stream-transcription-websocket"
canonical_headers = "host:" + host + "\n"
signed_headers = "host"
credential_scope = datestamp + "/" + region + "/" + service + "/" + "aws4_request"
canonical_querystring = "X-Amz-Algorithm=" + algorithm
canonical_querystring += "&X-Amz-Credential=" + urllib.parse.quote_plus(access_key_id + "/" + credential_scope)
canonical_querystring += "&X-Amz-Date=" + amz_date
canonical_querystring += "&X-Amz-Expires=300"
canonical_querystring += "&X-Amz-SignedHeaders=" + signed_headers
canonical_querystring += "&language-code="+ language_code +"&media-encoding=" + media_encoding +"&sample-rate=" + sample_rate
# Zero length string for connecting
payload_hash = hashlib.sha256(("").encode('utf-8')).hexdigest()
canonical_request = method + '\n' \
+ canonical_uri + '\n' \
+ canonical_querystring + '\n' \
+ canonical_headers + '\n' \
+ signed_headers + '\n' \
+ payload_hash
string_to_sign = algorithm + "\n" \
+ amz_date + "\n" \
+ credential_scope + "\n" \
+ hashlib.sha256(canonical_request.encode("utf-8")).hexdigest()
signing_key = getSignatureKey(secret_access_key, datestamp, region, service)
signature = hmac.new(signing_key, string_to_sign.encode("utf-8"),
hashlib.sha256).hexdigest()
canonical_querystring += "&X-Amz-Signature=" + signature
request_url = endpoint + canonical_uri + "?" + canonical_querystring
return request_url-
main 函数
def main():
url = create_pre_signed_url("us-east-1", "en-US", "pcm", "16000")
ws = websocket.create_connection(url, sslopt={"cert_reqs": ssl.CERT_NONE})
_thread.start_new_thread(loop_receiving, (ws,))
print("Receiving...")
send_data(ws)
while True:
time.sleep(1)
main()-
loop_receiving 函数
该函数位于 main 函数上方。它将接收 Amazon Transcribe Streaming Service 的返回数据，并且打印出来。
def loop_receiving(ws):
try:
while True:
result = ws.recv()
if result == '':
continue
eventStreamBuffer = EventStreamBuffer()
eventStreamBuffer.add_data(result)
eventStreamMessage = eventStreamBuffer.next()
stream_payload = eventStreamMessage.payload
transcript = json.loads(bytes.decode(stream_payload, "UTF-8"))
print("response:",transcript)
results = transcript['Transcript']['Results']
if len(results)>0:
for length in range(len(results)):
if 'IsPartial' in results[length]:
print('IsPartial:', results[length]['IsPartial'])
if 'Alternatives' in results[length]:
alternatives = results[length]['Alternatives']
if len(alternatives)>0:
for sublength in range(len(alternatives)):
if 'Transcript' in alternatives[sublength]:
print('Transcript:', alternatives[sublength]['Transcript'])
except Exception as e:
if 'WebSocketConnectionClosedException' == e.__class__.__name__:
print("Error: websocket connection is closed")
else:
print(f"Exception Name: {e.__class__.__name__}")-
send_data 函数
该函数位于 main 函数上方。它将发送音频数据到 Amazon Transcribe Streaming Service。其中 testFile 变量是测试音频文件地址，测试音频为 pem 格式，英语，采样率为16000。
def send_data(ws):
testFile = "xxx.pem"
bufferSize = 1024*16
stream_headers = {
":message-type": "event",
":event-type": "AudioEvent",
":content-type": "application/octet-stream",
}
eventstream_serializer = EventStreamMessageSerializer()
with open(testFile, "rb") as source:
while True:
audio_chunk = source.read(bufferSize)
# 将音频数据进行编码
event_bytes = eventstream_serializer.serialize(stream_headers, audio_chunk)
ws.send(event_bytes, opcode = 0x2) # 0 x 2 send binary
# end with b'' data bytes
if len(audio_chunk) == 0:
breakjava使用Transcribe演示实例
import com.amazonaws.AmazonServiceException;
import com.amazonaws.SdkClientException;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.*;
import com.amazonaws.services.s3.transfer.TransferManager;
import com.amazonaws.services.s3.transfer.Upload;
import com.amazonaws.services.transcribe.AmazonTranscribe;
import com.amazonaws.services.transcribe.AmazonTranscribeClientBuilder;
import com.amazonaws.services.transcribe.model.*;
import org.omg.CosNaming.NamingContextExtPackage.StringNameHelper;
import java.io.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* 代码注意： 生成job只保存到S3,所以要保存到本地的思路是先保存到S3,然后下载,
* 但是期间需要时间,所以不断的查询是否存在在不断的遍历循环比较慢
*
* @author DELL
* @Desc 将本地MP3上传到S3, 然后再转文本,保存json 文件到本地
* 基本步骤：
* 1.建立S3客户端连接
* 2.上传本地音频到S3库中,并返回一个S3地址
* 3.上传MP3对应的备用单词词库
* 3.在Amazon Transcribe 创建一个job,将生成的json 文件保存到MP3同级目录
*/
public class Mp3ToJsonUtils {
// 执行文件配置信息
private static String FILE_TYPE = "mp3";
// S3配置信息
private static String AWS_ACCESS_KEY = "自己生成";
private static String AWS_SECRET_KEY = "自己生成";
private static final String BUCKET_NAME = "自己生成";
private static final String JOB_BUCKET_NAME = "自己生成";
// Aws对象信息
private static AmazonS3 s3;
private static TransferManager tx;
private static AmazonTranscribe amazonTranscribe;
private static BasicAWSCredentials awsCredentials;
static {
//1. 建立连接
try {
init_with_key();
} catch (Exception e) {
e.printStackTrace();
}
awsCredentials = new BasicAWSCredentials(AWS_ACCESS_KEY, AWS_SECRET_KEY);
amazonTranscribe = AmazonTranscribeClientBuilder.standard().withCredentials(new AWSStaticCredentialsProvider(awsCredentials)).withRegion(Regions.US_EAST_2).build();
}
public static void main(String[] args) throws Exception {
List<String> list = new ArrayList<>();
mp3TOJosn("C:\\Users\\DELL\\Desktop\\BK测试数据\\A_Cinderella_Atlas_5.mp3", list);
}
public static void mp32Josn(String inPath, String savePath, List<String> list) throws Exception {
String jsonPath = new File(inPath).getParent();
String name = new File(inPath).getName().replaceAll(" ", "_").replaceAll("-", "_");
File file = new File(savePath + "\\" + name + ".json");
//确保上传一次
if (file.exists()) {
System.out.println(savePath + "--->已经处理完毕，跳过处理");
return;
}
//2. 上传文件到S3库,得到上传文件对应的S3 URL
String s3Path = uploadFileToBucket(inPath, BUCKET_NAME);
String key = new File(s3Path).getName();
key = key.replaceAll(" ", "_").replaceAll("-", "_");
//3. 创建Transcription jobs
createJob(JOB_BUCKET_NAME, FILE_TYPE, key, s3Path);
//4. 将json文件下载到本地和MP3 同目录
// 在创建job 生成json 的时候需要一定的时间,先等待一段时间,然后判断存在不存在
boolean flag = isObjectExit(BUCKET_NAME, key + ".json");
while (!flag) {
flag = isObjectExit(BUCKET_NAME, key + ".json");
}
amazonS3Downloading(s3, JOB_BUCKET_NAME, key + ".json", savePath + "\\" + key + ".json");
}
/**
* 将 MP3 转成 Json文件保存到本地
*
* @param inPath
* @throws Exception
*/
public static void mp3TOJosn(String inPath, List<String> list) throws Exception {
String jsonPath = new File(inPath).getParentFile().getParentFile().getParentFile().getAbsolutePath() + "\\json";
File file1 = new File(jsonPath);
if (!file1.exists()) {
file1.mkdirs();
}
mp32Josn(inPath, jsonPath, list);
}
/**
* 通过在代码中包含 access key id 和 secret access key 连接 aws
*
* @throws Exception
*/
private static void init_with_key() throws Exception {
AWSCredentials credentials = null;
credentials = new BasicAWSCredentials(AWS_ACCESS_KEY, AWS_SECRET_KEY);
s3 = new AmazonS3Client(credentials);
//Region usWest2 = Region.getRegion(Regions.US_WEST_2);
//s3.setRegion(usWest2);
tx = new TransferManager(s3);
}
/**
* 上传一个本地文件(对应位置为path)上传到名为bucketName的bucket
*
* @param path 需要上传文件的路径
* @param bucketName S3中存储文件的桶名称
* return 返回对应上传文件的key
*/
private static String uploadFileToBucket(String path, String bucketName) {
String keyName = new File(path).getName();
File fileToUpload = new File(path);
if (fileToUpload.exists() == false) {
System.out.println(path + " not exists!");
return null;
}
PutObjectRequest request = new PutObjectRequest(bucketName, fileToUpload.getName(), fileToUpload);
Upload upload = tx.upload(request);
while ((int) upload.getProgress().getPercentTransferred() < 100) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println(path + " MP3上传成功!");
String s3Path = "s3://" + BUCKET_NAME + "/" + keyName;
return s3Path;
}
/**
* 创建一个 Transcription jobs
*
* @param bucketName S3桶的名称
* @param fileName 文件类型 eg: mp3, mp4
* @param jobName 要创建的job的名称
* @param S3Path 对应S3桶中的对应MP3 或其他路径的S3URL
* @param vocabularyName Custom vocabulary 对应的名称
*/
protected static void createJob(String bucketName, String fileName, String jobName, String S3Path) {
StartTranscriptionJobRequest startTranscriptionJobRequest = new StartTranscriptionJobRequest();
Media media = new Media();
media.setMediaFileUri(S3Path);
// 设置JOb的相应参数 sampling rate 采（抽）样率;
startTranscriptionJobRequest.withMedia(media)
.withLanguageCode(LanguageCode.EnUS)
.withMediaFormat(fileName)
.withOutputBucketName(bucketName)
.withSettings(settings)
.setTranscriptionJobName(jobName);
amazonTranscribe.startTranscriptionJob(startTranscriptionJobRequest);
GetTranscriptionJobRequest request;
request = new GetTranscriptionJobRequest();
request.withTranscriptionJobName(jobName);
GetTranscriptionJobResult result = amazonTranscribe.getTranscriptionJob(request);
String status = result.getTranscriptionJob().getTranscriptionJobStatus();
while (!status.toUpperCase().equals("COMPLETED")) {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
//System.out.println(status);
result = amazonTranscribe.getTranscriptionJob(request);
status = result.getTranscriptionJob().getTranscriptionJobStatus();
if (status.toUpperCase().equals("FAILED")) {
System.out.println(result.getTranscriptionJob().getTranscriptionJobName() + "---> is failed");
System.out.println(result.getTranscriptionJob().getTranscriptionJobName() + "--->" + result.getTranscriptionJob().getFailureReason());
throw new RuntimeException("transcriobe 失败");
}
}
System.out.println(jobName + "Mp3 Job 生成成功");
}
/**
* 将S3上的文件下载到本地
*
* @param s3Client s3客户端
* @param bucketName 桶名称
* @param key 文件名称
* @param targetFilePath 本地路径
*/
public static void amazonS3Downloading(AmazonS3 s3Client, String bucketName, String key, String targetFilePath) {
S3Object object = s3Client.getObject(new GetObjectRequest(bucketName, key));
if (object != null) {
System.out.println("Content-Type: " + object.getObjectMetadata().getContentType());
InputStream input = null;
FileOutputStream fileOutputStream = null;
byte[] data = null;
try {
//获取文件流
input = object.getObjectContent();
data = new byte[input.available()];
int len = 0;
fileOutputStream = new FileOutputStream(targetFilePath);
while ((len = input.read(data)) != -1) {
fileOutputStream.write(data, 0, len);
}
System.out.println(targetFilePath + "json 文件下载文件成功");
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fileOutputStream != null) {
try {
fileOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (input != null) {
try {
input.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
/**
* 判断名为bucketName的bucket里面是否有一个名为key的object
*
* @param bucketName
* @param key
* @return
*/
private static boolean isObjectExit(String bucketName, String key) {
int len = key.length();
ObjectListing objectListing = s3.listObjects(bucketName);
String s = new String();
for (S3ObjectSummary objectSummary : objectListing.getObjectSummaries()) {
s = objectSummary.getKey();
int slen = s.length();
if (len == slen) {
int i;
for (i = 0; i < len; i++) {
if (s.charAt(i) != key.charAt(i)) {
break;
}
}
if (i == len) {
return true;
}
}
}
return false;
}
}