实现： 使用 OpenCV 在 Web 浏览器中捕获摄像头的实时馈送，并使用 PUT_MEDIA(end_point) 将其发送到 AWS Kinesis-video-stream（一种 aws 服务）。
已提及 Amazon AWS Kinesis Video Boto GetMedia/PutMedia 并做了一些更改以从相机拍摄。
显示用户流的 HTML 代码（从网络摄像头捕获的视频）：
<html>
<body>
<video autoplay="true" id="myVideo"></video>
</body>
</html>
'''
**views.py**
def get_endpoint_boto():
import boto3
client = boto3.client('kinesisvideo','us-east-2',aws_access_key_id = your_env_access_key_var ,aws_secret_access_key = your_env_secret_key_var)
response = client.get_data_endpoint(
StreamName=your_stream_name,
APIName='PUT_MEDIA'
)
print(response)
endpoint = response.get('DataEndpoint', None)
print("endpoint %s" % endpoint)
if endpoint is None:
raise Exception("endpoint none")
return endpoint
def sign(key, msg):
return hmac.new(key, msg.encode("utf-8"), hashlib.sha256).digest()
def get_signature_key(key, date_stamp, regionName, serviceName):
kDate = sign(('AWS4' + key).encode('utf-8'), date_stamp)
kRegion = sign(kDate, regionName)
kService = sign(kRegion, serviceName)
kSigning = sign(kService, 'aws4_request')
return kSigning
def get_host_from_endpoint(endpoint):
if not endpoint.startswith('https://'):
return None
retv = endpoint[len('https://'):]
return str(retv)
def get_region_from_endpoint(endpoint):
if not endpoint.startswith('https://'):
return None
retv = endpoint[len('https://'):].split('.')[2]
return str(retv)
class gen_request_parameters:
def __init__(self):
self._data = ''
if True:
print('True')
cap = cv.VideoCapture(0)
cap.set(5,60)
if not cap.isOpened():
exit()
ret, frame = cap.read()
request_parameters = cap.read()
self._data = request_parameters
self._pointer = 0
self._size = len(self._data)
def __next__(self):
print('next')
if self._pointer >= self._size:
raise StopIteration
left = self._size - self._pointer
chunksz = 16000
if left < 16000:
chunksz = left
pointer_start = self._pointer
self._pointer = self._pointer + chunksz
print("Data: chunk size %d" % chunksz)
return self._data[pointer_start:self._pointer]
def mediagolive(request, streamname):
your_stream_name = streamname
print(your_stream_name)
endpoint = get_endpoint_boto()
method = 'POST'
service = 'kinesisvideo'
host = get_host_from_endpoint(endpoint)
region = get_region_from_endpoint(endpoint)
endpoint += '/putMedia'
content_type = 'application/json'
start_tmstp = repr(time.time())
access_key = None
secret_key = None
while True:
k = your_env_access_key_var
if k is not None and type(k) is str and k.startswith('AKIA'):
access_key = k
k = your_env_secret_key_var
if k is not None and type(k) is str and len(k) > 4:
secret_key = k
break
if access_key is None or secret_key is None:
print('No access key is available.')
exit()
t = datetime.datetime.utcnow()
amz_date = t.strftime('%Y%m%dT%H%M%SZ')
date_stamp = t.strftime('%Y%m%d')
canonical_uri = '/putMedia'
canonical_querystring = ''
canonical_headers = ''
canonical_headers += 'connection:keep-alive\n'
canonical_headers += 'content-type:application/json\n'
canonical_headers += 'host:' + host + '\n'
canonical_headers += 'transfer-encoding:chunked\n'
canonical_headers += 'user-agent:AWS-SDK-KVS/2.0.2 GCC/7.4.0 Linux/4.15.0-46-generic x86_64\n'
canonical_headers += 'x-amz-date:' + amz_date + '\n'
canonical_headers += 'x-amzn-fragment-acknowledgment-required:1\n'
canonical_headers += 'x-amzn-fragment-timecode-type:ABSOLUTE\n'
canonical_headers += 'x-amzn-producer-start-timestamp:' + start_tmstp + '\n'
canonical_headers += 'x-amzn-stream-name:' + your_stream_name + '\n'
signed_headers = 'connection;content-type;host;transfer-encoding;user-agent;'
signed_headers += 'x-amz-date;x-amzn-fragment-acknowledgment-required;'
signed_headers += 'x-amzn-fragment-timecode-type;x-amzn-producer-start-timestamp;x-amzn-stream-name'
canonical_request = method + '\n' + canonical_uri + '\n' + canonical_querystring + '\n' + canonical_headers + '\n' + signed_headers
canonical_request += '\n'
canonical_request += hashlib.sha256(''.encode('utf-8')).hexdigest()
algorithm = 'AWS4-HMAC-SHA256'
credential_scope = date_stamp + '/' + region + '/' + service + '/' + 'aws4_request'
string_to_sign = algorithm + '\n' + amz_date + '\n' + credential_scope + '\n' + hashlib.sha256(
canonical_request.encode('utf-8')).hexdigest()
signing_key = get_signature_key(secret_key, date_stamp, region, service)
signature = hmac.new(signing_key, (string_to_sign).encode('utf-8'),
hashlib.sha256).hexdigest()
authorization_header = algorithm + ' ' + 'Credential=' + access_key + '/' + credential_scope + ', '
authorization_header += 'SignedHeaders=' + signed_headers + ', ' + 'Signature=' + signature
headers = {
'Accept': '*/*',
'Authorization': authorization_header,
'connection': 'keep-alive',
'content-type': content_type,
#'host': host,
'transfer-encoding': 'chunked',
# 'x-amz-content-sha256': 'UNSIGNED-PAYLOAD',
'user-agent': 'AWS-SDK-KVS/2.0.2 GCC/7.4.0 Linux/4.15.0-46-generic x86_64',
'x-amz-date': amz_date,
'x-amzn-fragment-acknowledgment-required': '1',
'x-amzn-fragment-timecode-type': 'ABSOLUTE',
'x-amzn-producer-start-timestamp': start_tmstp,
'x-amzn-stream-name': your_stream_name,
'Expect': '100-continue'
}
print('\nBEGIN REQUEST++++++++++++++++++++++++++++++++++++')
print('Request URL = ' + endpoint)
r = requests.post(endpoint, data=gen_request_parameters().__next__(), headers=headers)
print('\nResponse Meta ++ \n',r.content.decode('utf8'))
print('\nRESPONSE++++++++++++++++++++++++++++++++++++')
print('Response code: %d\n' % r.status_code)
print(r.text)
'''
这是我得到的控制台日志： 在这里，我收到了来自 AWS 的“200”响应，这意味着我能够正确到达终点。 但我不确定帧是否被发送到 AWS 流，因为在 kinesis-video-streaming 仪表板中的 AWS 媒体播放中没有显示任何内容。
BEGIN REQUEST++++++++++++++++++++++++++++++++++++
Request URL = https://s-171c51c7.kinesisvideo.us-east-2.amazonaws.com/putMedia
True
frame [[[ 45 66 118]
[110 131 183]
[152 176 220]
[ 77 60 63]
[ 73 58 61]
[ 71 57 59]]
[[ 66 65 127]
[136 135 197]
[156 179 221]
[ 77 63 65]
[ 71 62 61]
[ 70 61 60]]
[[ 61 80 131]
[126 145 197]
[159 185 215]
[ 80 65 68]
[ 77 64 64]
[ 76 62 62]]
[[ 32 25 24]
[ 32 25 24]
[ 31 26 27]
[ 22 22 22]
[ 20 23 21]
[ 20 23 21]]
[[ 26 24 24]
[ 28 25 26]
[ 28 25 26]
[ 22 22 22]
[ 21 21 21]
[ 21 21 21]]
[[ 25 24 22]
[ 26 25 23]
[ 26 25 23]
[ 22 22 22]
[ 22 22 22]
[ 21 21 21]]]
next
Data: chunk size 100
[ WARN:1] global C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-kh7iq4w7\opencv\modules\videoio\src\cap_msmf.cpp (434) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback
在 HTML 上呈现的错误：
TypeError at /go_live/
cannot unpack non-iterable bool object
Request Method: GET
Request URL: http://127.0.0.1:8000/go_live/
Django Version: 3.0.5
Exception Type: TypeError
Exception Value:
cannot unpack non-iterable bool object