# !/usr/bin/python
# -*- coding:utf-8 -*-
# time: 2019/07/02--08:12
__author__ = 'Henry'


'''
项目: B站视频下载 - 多线程下载

版本1: 加密API版,不需要加入cookie,直接即可下载1080p视频

20190422 - 增加多P视频单独下载其中一集的功能
20190702 - 增加视频多线程下载 速度大幅提升
'''

import requests, time, hashlib, urllib.request, re, json
from moviepy.editor import *
import os, sys, threading
import signal
import imageio
imageio.plugins.ffmpeg.download()

# 线程信号量, 限制并发数
S = threading.Semaphore(5)

# 正在下载的视频
currentPage = []

# 清屏函数
def Clear():
    Hide()
    print('\033[2J', end='')

# 显示光标
def Show():
    print('\033[?25h', end='')

# 隐藏光标
def Hide():
    print('\033[?25l', end='')

# 移动到位置,且清除这一行
def POS(x=0,y=0):
    print('\033[{};{}H\033[K'.format(y,x), end='')

def signal_handler(signal,frame):
    Show()
    sys.exit(0)
 
signal.signal(signal.SIGINT,signal_handler)

# 访问API地址
def get_play_list(start_url, cid, quality):
    entropy = 'rbMCKn@KuamXWlPMoJGsKcbiJKUfkPF_8dABscJntvqhRSETg'
    appkey, sec = ''.join([chr(ord(i) + 2) for i in entropy[::-1]]).split(':')
    params = 'appkey=%s&cid=%s&otype=json&qn=%s&quality=%s&type=' % (appkey, cid, quality, quality)
    chksum = hashlib.md5(bytes(params + sec, 'utf8')).hexdigest()
    url_api = 'https://interface.bilibili.com/v2/playurl?%s&sign=%s' % (params, chksum)
    headers = {
        'Referer': start_url,  # 注意加上referer
        'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36'
    }
    # print(url_api)
    html = requests.get(url_api, headers=headers).json()
    # print(json.dumps(html))
    video_list = []
    for i in html['durl']:
        video_list.append(i['url'])
    # print(video_list)
    return video_list


# 下载视频
'''
 urllib.urlretrieve 的回调函数：
def callbackfunc(blocknum, blocksize, totalsize):
    @blocknum:  已经下载的数据块
    @blocksize: 数据块的大小
    @totalsize: 远程文件的大小
'''


def Schedule_cmd(title, page):
    start_time = time.time()
    def Schedule(blocknum, blocksize, totalsize):
        # 进度条打印在第几行
        lineNum = currentPage.index(page)+1
        POS(0, lineNum)
        speed = (blocknum * blocksize) / (time.time() - start_time)
        # speed_str = " Speed: %.2f" % speed
        speed_str = " Speed: %s" % format_size(speed)
        recv_size = blocknum * blocksize

        # 设置下载进度条
        percent = recv_size / totalsize
        percent_str = "%.2f%%" % (percent * 100)
        n = round(percent * 50)
        s = ('#' * n).ljust(50, '-')
        print('P{}:'.format(page) + '[' + s + ']  ' + percent_str.ljust(6, ' ') + speed_str)
    return Schedule


# 字节bytes转化K\M\G
def format_size(bytes):
    try:
        bytes = float(bytes)
        kb = bytes / 1024
    except:
        print("传入的字节格式不对")
        return "Error"
    if kb >= 1024:
        M = kb / 1024
        if M >= 1024:
            G = M / 1024
            return "%.3fG" % (G)
        else:
            return "%.3fM" % (M)
    else:
        return "%.3fK" % (kb)


#  下载视频
def down_video(video_list, title, start_url, page):
    S.acquire()
    num = 1
    currentVideoPath = os.path.join(sys.path[0], 'bilibili_video', title)  # 当前目录作为下载目录
    if not os.path.exists(currentVideoPath):
        os.makedirs(currentVideoPath)
    for i in video_list:
        opener = urllib.request.build_opener()
        # 请求头
        opener.addheaders = [
            # ('Host', 'upos-hz-mirrorks3.acgvideo.com'),  #注意修改host,不用也行
            ('User-Agent', 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:56.0) Gecko/20100101 Firefox/56.0'),
            ('Accept', '*/*'),
            ('Accept-Language', 'en-US,en;q=0.5'),
            ('Accept-Encoding', 'gzip, deflate, br'),
            ('Range', 'bytes=0-'),  # Range 的值要为 bytes=0- 才能下载完整视频
            ('Referer', start_url),  # 注意修改referer,必须要加的!
            ('Origin', 'https://www.bilibili.com'),
            ('Connection', 'keep-alive'),
        ]
        urllib.request.install_opener(opener)
        # 创建文件夹存放下载的视频
        if not os.path.exists(currentVideoPath):
            os.makedirs(currentVideoPath)
        # 开始下载
        reporthook = Schedule_cmd(title, page)
        currentPage.append(page)
        if len(video_list) > 1:
            urllib.request.urlretrieve(url=i, filename=os.path.join(currentVideoPath, r'{}-{}.flv'.format(title, num)),reporthook=reporthook)  # 写成mp4也行  title + '-' + num + '.flv'
        else:
            urllib.request.urlretrieve(url=i, filename=os.path.join(currentVideoPath, r'{}.flv'.format(title)),reporthook=reporthook)  # 写成mp4也行  title + '-' + num + '.flv'
        currentPage.remove(page)
        num += 1
    S.release()

# 合并视频(20190802新版)
def combine_video(title_list):
    video_path = os.path.join(sys.path[0], 'bilibili_video')  # 下载目录
    for title in title_list:
        current_video_path = os.path.join(video_path ,title)
        if len(os.listdir(current_video_path)) >= 2:
            # 视频大于一段才要合并
            print('[下载完成,正在合并视频...]:' + title)
            # 定义一个数组
            L = []
            # 遍历所有文件
            for file in sorted(os.listdir(current_video_path), key=lambda x: int(x[x.rindex("-") + 1:x.rindex(".")])):
                # 如果后缀名为 .mp4/.flv
                if os.path.splitext(file)[1] == '.flv':
                    # 拼接成完整路径
                    filePath = os.path.join(current_video_path, file)
                    # 载入视频
                    video = VideoFileClip(filePath)
                    # 添加到数组
                    L.append(video)
            # 拼接视频
            final_clip = concatenate_videoclips(L)
            # 生成目标视频文件
            final_clip.to_videofile(os.path.join(current_video_path, r'{}.mp4'.format(title)), fps=24, remove_temp=False)
            print('[视频合并完成]' + title)
        else:
            # 视频只有一段则直接打印下载完成
            print('[视频合并完成]:' + title)


if __name__ == '__main__':
    start_time = time.time()
    # 用户输入av号或者视频链接地址
    print('*' * 30 + 'B站视频下载小助手' + '*' * 30)
    start = input('请输入您要下载的B站av号或者视频链接地址:')
    if start.isdigit() == True:  # 如果输入的是av号
        # 获取cid的api, 传入aid即可
        start_url = 'https://api.bilibili.com/x/web-interface/view?aid=' + start
    else:
        # https://www.bilibili.com/video/av46958874/?spm_id_from=333.334.b_63686965665f7265636f6d6d656e64.16
        start_url = 'https://api.bilibili.com/x/web-interface/view?aid=' + re.search(r'/av(\d+)/*', start).group(1)

    # 视频质量
    # <accept_format><![CDATA[flv,flv720,flv480,flv360]]></accept_format>
    # <accept_description><![CDATA[高清 1080P,高清 720P,清晰 480P,流畅 360P]]></accept_description>
    # <accept_quality><![CDATA[80,64,32,16]]></accept_quality>
    quality = input('请输入您要下载视频的清晰度(1080p:80;720p:64;480p:32;360p:16)(填写80或64或32或16):')
    # 获取视频的cid,title
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36'
    }
    html = requests.get(start_url, headers=headers).json()
    data = html['data']
    cid_list = []
    if '?p=' in start:
        # 单独下载分P视频中的一集
        p = re.search(r'\?p=(\d+)',start).group(1)
        cid_list.append(data['pages'][int(p) - 1])
    else:
        # 如果p不存在就是全集下载
        cid_list = data['pages']
    # print(cid_list)
    # 创建线程池
    threadpool = []
    title_list = []
    Hide()
    for i, item in enumerate(cid_list):
        cid = str(item['cid'])
        title = item['part']
        title = re.sub(r'[\/\\:*?"<>|]', '', title)  # 替换为空的
        # s是进度条
        s = ('#' * round(i/len(cid_list)*50)).ljust(50, '-')
        print('加载视频cid:[{}] {}/{}\r'.format(s,i,len(cid_list)), end='')
        title_list.append(title)
        page = str(item['page'])
        start_url = start_url + "/?p=" + page
        video_list = get_play_list(start_url, cid, quality)
        # down_video(video_list, title, start_url, page)
        # 定义线程
        th = threading.Thread(target=down_video, args=(video_list, title, start_url, page))
        # 将线程加入线程池
        threadpool.append(th)
        
    Clear()
    # 开始线程
    for th in threadpool:
        th.start()
    # 等待所有线程运行完毕
    for th in threadpool:
        th.join()
    Show()
    # 最后合并视频
    print(title_list)
    combine_video(title_list)
    
    end_time = time.time()  # 结束时间
    print('下载总耗时%.2f秒,约%.2f分钟' % (end_time - start_time, int(end_time - start_time) / 60))
    # 如果是windows系统，下载完成后打开下载目录
    currentVideoPath = os.path.join(sys.path[0], 'bilibili_video')  # 当前目录作为下载目录
    if (sys.platform.startswith('win')):
        os.startfile(currentVideoPath)


# 分P视频下载测试: https://www.bilibili.com/video/av19516333/
# 下载总耗时14.21秒,约0.23分钟