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tools_recognizer.py
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tools_recognizer.py
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#!/usr/bin/env python
#-*- coding:utf-8 -*-
import os
import sys
import hmac
import json
import time
import struct
import base64
import hashlib
import requests
import datetime
import traceback
import acrcloud_stream_tool as acrcloud_stream_decode
class acrcloud_recognize:
def __init__(self, dlog):
self.dlog = dlog
self.noResult_count = 0
self.rate = 0
def post_multipart(self, url, pdata, files, timeout):
try:
headers = {
'Accept-encoding': 'gzip'
}
r = requests.post(url, files=files, data=pdata, headers=headers)
r.encoding = 'utf-8'
if r.status_code == 200:
return r.text.strip()
else:
self.dlog.logger.error('post_multipart.requests.error: key:{0}, sid: {1}, r_code: {2}, r_text:{3}'.format(pdata['access_key'], pdata['stream_id'], r.status_code, r.text))
except Exception as e:
self.dlog.logger.error('post_multipart', exc_info=True)
return None
def encode_multipart_formdata(self, fields, files):
try:
boundary = '*****2016.05.27.acrcloud.rec.copyright.' + str(time.time()) + '*****'
body = b''
CRLF = '\r\n'
L = []
for (key, value) in list(fields.items()):
L.append('--' + boundary)
L.append('Content-Disposition: form-data; name="%s"' % key)
L.append('')
L.append(value)
body = bytes(CRLF.join(L), encoding='utf-8')
for (key, value) in list(files.items()):
L = []
L.append(CRLF + '--' + boundary)
L.append('Content-Disposition: form-data; name="%s"; filename="%s"' % (key, key))
L.append('Content-Type: application/octet-stream')
L.append(CRLF)
body = body + CRLF.join(L).encode('ascii') + value
body = body + (CRLF + '--' + boundary + '--' + CRLF + CRLF).encode('ascii')
content_type = 'multipart/form-data; boundary=%s' % boundary
return content_type, body
except Exception as e:
self.dlog.logger.error('encode_multipart_formdata error', exc_info=True)
return None, None
def add_wav_header(self, buf, audio_sample_rate):
try:
buf_size = len(buf)
flag_riff = 'RIFF'
file_size = buf_size + 44 - 8
flag_wave = 'WAVE'
flag_fmt = 'fmt '
version = 0x10
iformat = 1
channel = 1
SamplePerSec = audio_sample_rate #8000
AvgBytesPerSec = audio_sample_rate*2 #16000
blockalign = 2
BitPerSample = 16
flag_data = 'data'
pcm_size = buf_size
wav_header = struct.pack('4si4s4sihhiihh4si', flag_riff, file_size, flag_wave, flag_fmt, version, iformat,
channel, SamplePerSec, AvgBytesPerSec, blockalign, BitPerSample, flag_data, pcm_size)
wav_buf = wav_header + buf
return wav_buf
except Exception as e:
self.dlog.logger.error('Error@add_wav_header', exc_info=True)
return buf
def pcm_to_aac(self, pcm_buf, pcm_sample_rate=8000, atype='aac', is_strip=False):
try:
opt = {
'sample_rate': pcm_sample_rate,
'channels': 1,
'bit_rate': 16*1024,
'type': atype
}
if is_strip:
opt['is_strip'] = 1
if acrcloud_stream_decode:
encoder = acrcloud_stream_decode.Encoder(opt)
encoder.write(pcm_buf)
abuf = encoder.read_all()
return abuf
else:
return pcm_buf
except Exception as e:
self.dlog.logger.error('Error@pcm_to_aac', exc_info=True)
return ''
def gen_fp(self, buf, rate=0):
return acrcloud_stream_decode.create_fingerprint(buf, False, 300, 0.3)
def do_recogize(self, host, query_data, query_type, stream_id, access_key, access_secret, timeout=10):
http_method = 'POST'
http_url_file = '/v1/monitor/identify'
data_type = query_type
signature_version = '1'
timestamp = int(time.mktime(datetime.datetime.utcfromtimestamp(time.time()).timetuple()))
sample_bytes = str(len(query_data))
string_to_sign = http_method + '\n' + http_url_file + '\n' + access_key + '\n' + data_type + '\n' + signature_version + '\n' + str(timestamp)
hmac_res = hmac.new(access_secret.encode('ascii'), string_to_sign.encode('ascii'), digestmod=hashlib.sha1).digest()
sign = base64.b64encode(hmac_res).decode('ascii')
fields = {
'access_key': access_key,
'stream_id': stream_id,
'sample_bytes': sample_bytes,
'timestamp': str(timestamp),
'signature': sign,
'data_type': data_type,
'signature_version': signature_version
}
server_url = 'http://' + host + http_url_file
res = self.post_multipart(server_url, fields, {'sample' : query_data}, timeout)
return res
def recognize(self, host, wav_buf, query_type, stream_id, access_key, access_secret):
try:
res = ''
fp_buf = ''
fp_buf = self.gen_fp(wav_buf, self.rate)
res = self.do_recogize(host, fp_buf, query_type, stream_id, access_key, access_secret)
except Exception as e:
self.dlog.logger.error('recognize error', exc_info=True)
return res, ''
def recognize_new(self, host, wav_buf, query_type, stream_id, access_key, access_secret, encode=False):
try:
res, in_buf = '', ''
if query_type == 'audio':
if not encode:
in_buf = self.add_wav_header(wav_buf, 8000)
else:
in_buf = self.pcm_to_aac(wav_buf, 8000, 'aac', True)
elif query_type == 'fingerprint':
in_buf = self.gen_fp(wav_buf, self.rate)
if in_buf:
res = self.do_recogize(host, in_buf, query_type, stream_id, access_key, access_secret)
except Exception as e:
self.dlog.logger.error('recognize_by_fp error.stream_id:{0}'.format(stream_id), exc_info=True)
return res