parse_m3u8_info : 返回M3U8内容, 但不是最终的, 只是简单的打印出来

parse_final_m3u8_info : 返回M3U8的完整内容

如果有多路stream,默认返回的是第一路的stream

has_ext_stream : 判断M3U8中是否存在#EXT-X-STREAM-INF

has_ext_key : 判断M3U8中是否存在#EXT-X-KEY, 就是m3u8是否被加密

has_ext_discontinuity : 判断M3U8中是否存在#EXT-X-DISCONTINUITY

当码流发生切换的时候, 会提示这个标签

get_total_duration : 获取M3U8文件的总时长

1.打印M3U8内容

#!/usr/bin/python

# -*- coding: UTF-8 -*-

import requests

import urlparse

URL='https://tv2.youkutv.cc/2020/04/14/MbqulRmS8sjQGJG9/playlist.m3u8'

### 返回m3u8文件,不是最终的

def parse_m3u8_info(url):

val = urlparse.urlsplit(url)

if (val.scheme != 'http') and (val.scheme != 'https'):

return 'Error protocol'

result = ''

request = requests.get(url, timeout=20)

for line in request.iter_lines():

result += line + '\n'

return result

result = parse_m3u8_info(URL)

print('M3U8文件内容如下:\n' + result)

#EXTM3U

#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1500000,RESOLUTION=720x406

1500kb/hls/index.m3u8

2.打印M3U8完整文件

#!/usr/bin/python

# -*- coding: UTF-8 -*-

import requests

import urlparse

### M3U8 Tag

TAG_PREFIX = '#EXT'

TAG_STREAM_INF = '#EXT-X-STREAM-INF'

### M3U8 Pattern Tag

REGEX_MEDIA_DURATION = TAG_MEDIA_DURATION + ':([\\d\\.]+)\\b'

URL='http://video.yjf138.com:8091/20180812/6yl0Q2YZ/index.m3u8'

### 返回最终的m3u8文件

def parse_final_m3u8_info(url):

val = urlparse.urlsplit(url)

if (val.scheme != 'http') and (val.scheme != 'https'):

return 'Error protocol'

request = requests.get(url, timeout=20)

result = ''

hasStreamInf = False

for line in request.iter_lines():

if (line.startswith(TAG_PREFIX)):

result += line + '\n'

if (line.startswith(TAG_STREAM_INF)):

hasStreamInf = True

continue

if (hasStreamInf):

return parse_final_m3u8_info(get_final_url(url, line))

hasStreamInf = False

result += get_final_url(url, line) + '\n'

return result

### 根据m3u8中的分片写法得到完整的url

def get_final_url(url, line):

val = urlparse.urlsplit(url)

hostUrl = url[0:url.index(val.netloc)+len(val.netloc)]

baseUrl = url[0:url.rindex('/')+1]

if (line.startswith('/')):

tempUrl = ''

if (line[1:].find('/') != -1):

tempIndex = line[1:].index('/')

tempUrl = line[0:tempIndex]

if (url.find(tempUrl) != -1):

tempIndex = url.index(tempUrl)

tempUrl = url[0:tempIndex] + line

else:

tempUrl = hostUrl + line[1:]

return tempUrl

else:

tempUrl = baseUrl + line[1:]

return tempUrl

if (line.startswith('http://') or line.startswith('https://')):

return line

return baseUrl + line

finalResult = parse_final_m3u8_info(URL)

print('M3U8文件最终内容如下:\n' + finalResult)

3.统计M3U8的总时长

#!/usr/bin/python

# -*- coding: UTF-8 -*-

import requests

import urlparse

import re

### M3U8 Tag

TAG_PREFIX = '#EXT'

TAG_MEDIA_DURATION = "#EXTINF";

TAG_STREAM_INF = '#EXT-X-STREAM-INF'

### M3U8 Pattern Tag

REGEX_MEDIA_DURATION = TAG_MEDIA_DURATION + ':([\\d\\.]+)\\b'

URL='http://video.yjf138.com:8091/20180812/6yl0Q2YZ/index.m3u8'

### 获取M3U8文件的总时长

def get_total_duration(url):

val = urlparse.urlsplit(url)

if (val.scheme != 'http') and (val.scheme != 'https'):

return 'Error protocol'

request = requests.get(url, timeout=20)

result = ''

hasStreamInf = False

totalDuration = 0

for line in request.iter_lines():

if (line.startswith(TAG_PREFIX)):

if (line.startswith(TAG_STREAM_INF)):

hasStreamInf = True

elif (line.startswith(TAG_MEDIA_DURATION)):

ret = parse_pattern_str(REGEX_MEDIA_DURATION, line)

totalDuration += float(ret)

continue

if (hasStreamInf):

return get_total_duration(get_final_url(url, line))

hasStreamInf = False

return totalDuration

def parse_pattern_str(pattern_str, str):

matchObj = re.match(pattern_str, str)

if (matchObj) :

return matchObj.group(1)

return ''

totalDuration = get_total_duration(URL)

print('此M3U8文件的总时间: --->' + str(totalDuration))

上面出现过的get_final_url函数我就不重复写了。

上面用到了一个正则匹配，需要导入import re

4.是否存在KEY

http://video.yjf138.com:8091/20180812/6yl0Q2YZ/index.m3u8 中包含#EXT-X-KEY / #EXT-X-DISCONTINUITY / #EXT-X-STREAM-INF

#EXT-X-KEY:METHOD=AES-128,URI="key.key"

说明这时候使用AES-128加密,加密的密钥是 key.key, 当然是存在当前服务器上的密钥.

5.是否存在DISCONTINUITY

当发生码流变化的时候会出现这个标签，说明前后的ts可能会出现码流、分辨率、编码格式等属性的不同。播放器需要提前做好准备。

6.是否存在多路流

为多个分辨率准备的标签，当出现这个标签的时候，会标识当前流的分辨率、码流等属性，说明下面对应出现的还是一个M3U8索引文件。