[系统与软件] 将 R-Pi 打造成一个大屏幕的服务器

发表于 2012-10-31 19:30:55 | 显示全部楼层 |阅读模式

R-Pi 的 hdmi 输出，用来看视频是件不错的事情。
试曾想过我们在手机或者平板上看到一张美丽的图片，视频，然后想在高清电视，上播放出来。
有个很简单的方法。在 R-Pi 上开启 http 服务，通过局域网，由手机或者平板，提交信息给 R-Pi然后就可以了。
下面以网络视频为例：
1、首先安装一些基本的软件和软件包：

# apt-get install mplayer
# easy_install bottle
# easy_install beautifulsoup4
# easy_install requests
# easy_install mplayer.py

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2、导入基本的模块。

from bottle import Bottle, request, response
import mplayer, requests
from bs4 import BeautifulSoup
import os, re
import json

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3、初始化：

app = Bottle()
player = None

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4、解析视频地址：

def parse_video(url, format='nomal'):
browser = requests.session()
browser.config['base_headers']['User-Agent'] = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/536.11 (KHTML, like Gecko) Ubuntu/12.04 Chromium/20.0.1132.47 Chrome/20.0.1132.47 Safari/536.11'
r = browser.get('http://www.flvcd.com/parse.php?kw=%s&flag=one&format=%s'%(url, format))
r.encoding = 'GBK'
html = BeautifulSoup(r.text)
mform = html.find('form', {'name':'mform', 'method':'post'})
if mform:
name = mform.find('input', {'name':'name'}).get('value')
info = mform.find('input', {'name':'inf'}).get('value')
urls = [u for u in re.findall(r'<u>(.+)', info, re.I) if u]
return urls
return None

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5、播放视频：

@app.post('/play')
def play():
global player
data = request.forms.get('json', None)
if data is None:
return {'err':'403', 'msg':'request error'}
print(data)
data = json.loads(data)
files = data.get('files', [])
url = data.get('url')
last = data.get('start', 0)
fullscreen = data.get('fullscreen', False)
volume = data.get('volume')
if url:
format = data.get('format', 'nomal')
files = parse_video(url, format)
if files is None or len(files)==0:
return {'err':'403', 'msg':'request error'}
if player is None or not player.is_alive():
player = mplayer.Player()
if fullscreen:
player.fullscreen = bool(fullscreen)
if volume:
player.volume = float(volume)
for fn in files:
player.loadfile(fn, last)
last += 1
return {'last': last}

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6、暂停：

@app.post('/pause')
def pause():
if player and player.is_alive():
player.pause()
return {'paused':player.paused}
else:
return {'err':'403', 'msg':'player is quit'}
@app.get('/paused')
def paused():
if player and player.is_alive():
return {'paused':player.paused}
else:
return {'err':'403', 'msg':'player is quit'}

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7、退出

@app.post('/quit')def quit():
global player
if player and player.is_alive():
player.quit()
player = None
return {'msg':'quit'}

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8、全屏

@app.post('/fullscreen')
def fullscreen(is_set=True):
if player and player.is_alive():
if is_set:
player.fullscreen = not player.fullscreen
return {'fullscreen':player.fullscreen}
return {'err':'403', 'msg':'player is quit'}
@app.get('/fullscreen')
def _fullscreen():
return fullscreen(False)

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9、声音

@app.post('/volume')
def volume(is_set=True):
if player and player.is_alive():
if is_set:
volume = request.forms.get('value', 100.0)
player.volume = float(volume)
return {'volume':player.volume}
return {'err':'403', 'msg':'player is quit'}
@app.get('/volume')
def _volume():
return volume(False)

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10、定位

@app.post('/seek')
def seek():
if player and player.is_alive():
value = request.forms.get('value', 0)
type = request.forms.get('type', 0)
player.seek(float(value), int(type))
return {'length':player.length, 'position':player.percent_pos}
return {'err':'403', 'msg':'player is quit'}
@app.post('/pt_step')
def pt_step():
if player and player.is_alive():
value = request.forms.get('value', 1)
force = request.forms.get('force', 0)
if force:
player.pt_step(int(value), int(force))
else:
player.pt_step(int(value))
return {'filename':player.filename}
else:
return {'err':'403', 'msg':'player is quit'}

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11、状态

@app.get('/status')
def status():
if player and player.is_alive():
return {'filename':player.filename, 'position':player.percent_pos, 'length':player.length}
else:
return {'err':'403', 'msg':'player is quit'}

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12、静音