mpd mpc查询语言

Question

我不知道如何使用 mpc 正确查询 mpd。

例如：我知道如何列出所有专辑

mpc list album

但我想得到的不仅仅是名字。

如何查询 mpd 专辑、路径、艺术家、曲目编号、持续时间等？最好在一个查询中，但多个查询也可以。

我试图阅读 mpc 手册页和 mpd 的官方文档，但无法理解。

Answer 1

 import audioscrobbler
import mpd
import random
import time


lastsong = {}

def timer_control():
    get_similar()
    time.sleep(10)
    timer_control()

def get_similar():
    audioscrobbler
    client = mpd.MPDClient()
    client.connect("localhost", 6600)
    mpdstatus = client.status()
    prevsonginfo = client.currentsong()
    global lastsong
    if mpdstatus['state'] == "stop": return
    if prevsonginfo == lastsong: return 

    lastsong = prevsonginfo
    similarartists = ""
    song = prevsonginfo
    #if not song: break #No song, do nothing
    prevartist = song['artist']

    # Is the info already cached?
    similar_cache = {}
    if similar_cache.has_key(prevartist):
        similarartists = similar_cache[prevartist]
    else:
        #Not cached so fetch from Audioscrobbler
        try:
            similarartists = [artist.name for artist in audioscrobbler.AudioScrobblerQuery(artist=prevartist).similar()]
            # Cache search results and save some time next search
            similar_cache[prevartist] = similarartists
        except audioscrobbler.AudioScrobblerError:
            similar_cache[prevartist] = None # Empty cache
            return # Do nothing!

    if not similarartists: return # Empty list

    # Split list in half and sort upper half
    # this means good matches will have priority
    # but makes sure artist A does not always result in artist B
    half_idx = len(similarartists)/2
    upperhalf = similarartists[:half_idx]
    lowerhalf = similarartists[half_idx:]
    random.shuffle(upperhalf)
    artistlist = upperhalf
    artistlist.extend(lowerhalf)
    # Try each artist in order
    for artist in artistlist:
        try:
            print "Trying:",artist
            songs = client.search("artist", artist)
            if not songs: continue
            selected_song = random.sample(songs, 1)[0]
            client.add(selected_song['file'])
            print "Added", selected_song['title'],"by",selected_song['artist']
            # Delete old song from playlist?
            break
        except mpd.MPDError, e:
            print "MPDError", e.message
            continue
        except ValueError, e:
            print "ValueError:",e.message
            continue


timer_control()

关注这篇文章了解更多信息 https://bbs.archlinux.org/viewtopic.php?id=49765 http://manpages.ubuntu.com/manpages/intrepid/man1/mpc.1.html

Answer 2

mpc（在撰写本文时，v0.27-1）没有任何命令可以为您提供由 uri 标识的歌曲的所有元数据。没想到，居然没有。

然而，MPD communication protocol 确实 return 关于每首歌曲的完整信息。

如果我发出 mpc current 我只会得到这样的回应：

Afro Celt Sound System - Release

但是，如果我发送 MPD（而非 MPC）命令 currentsong，那么我会从 MPD 收到此响应：

file: gavin/Compilations/Volume 2 _ Release/01 Release.m4a
Last-Modified: 2005-03-02T14:16:51Z
Artist: Afro Celt Sound System
Album: Volume 2 : Release
Title: Release
Track: 1/11
Genre:World
Date: 1999
Composer: Simon Emerson, James McNally, Iarla O Lionaird, Martin Russell & Sinead O'Connor/Sinéad O'Connor
Disc: 1/1
Time: 456
Pos: 0
Id: 53616

如果我发送 MPD 命令 playlistid 49312 我会收到这样的回复：

file: gavin/ATB/Future Memories/16 Missing 1.m4a
Last-Modified: 2013-11-17T21:14:43Z
Artist: ATB
Album: Future Memories
Title: Missing
Track: 16/29
Genre: Dance
Date: 2009-05-01T07:00:00Z
Composer: Tracey Thorn & Ben Watt
Disc: 1/1
AlbumArtist: ATB
Time: 256
Pos: 10
Id: 49312

如果我发送命令 search file surfing 我会得到这个响应（不同的歌曲由新的 file: 分隔）：

file: doza/Air/06 Surfing On a Rocket.m4a
Last-Modified: 2015-11-20T15:56:00Z
Time: 223
Artist: Air
Album: Talkie Walkie
Title: Surfing On a Rocket
Track: 6/10
Genre: Electronic
Date: 2004-01-26T08:00:00Z
Disc: 1/1
AlbumArtist: Air
file: gavin/Air/Surfing On a Rocket EP/06 Surfing on a rocket (remixed by Joakim).m4a
Last-Modified: 2015-01-13T15:31:39Z
Time: 393
Artist: Air
Album: Surfing On a Rocket EP
Title: Surfing on a rocket (remixed by Joakim)
Track: 6/7
Genre: Dance
Date: 2004-09-10T07:00:00Z
Composer: Jean-Benoit Dunckel & Nicolas Godin
Disc: 1/1
AlbumArtist: Air
file: gavin/The Beach Boys/Greatest Surfing Songs!/02 Little Deuce Coupe.mp3
Last-Modified: 2009-09-10T04:32:49Z
Time: 111
Artist: The Beach Boys
Title: Little Deuce Coupe
Album: Greatest Surfing Songs!
Track: 2
Genre: Sunshine Pop

如果我发送 MPD 命令 listplaylistinfo Thump，我会得到这样的响应：

file: gavin/Muse/The 2nd Law (Deluxe Version)/02 Madness.m4a
Last-Modified: 2013-11-17T22:30:54Z
Artist: Muse
Album: The 2nd Law (Deluxe Version)
Title: Madness
Track: 2/13
Genre: Alternative
Date: 2012-10-01T07:00:00Z
Disc: 1/1
AlbumArtist: Muse
Time: 280
file: gavin/U2/The Best Of 1990-2000/15 Numb (New Mix).mp3
Last-Modified: 2003-09-24T14:31:05Z
Artist: U2
Title: Numb (New Mix)
Album: The Best Of 1990-2000
Track: 15/16
Date: 2002
Genre: Rock
Composer: U2
Time: 264
file: gavin/Massive Attack/Mezzanine/03 Teardrop.m4a
Last-Modified: 2012-09-05T19:38:14Z
Artist: Massive Attack
Album: Mezzanine
Title: Teardrop
Track: 3/11
Genre: Electronic
Date: 1998-04-20T07:00:00Z
Disc: 1/1
AlbumArtist: Massive Attack
Time: 331
file: gavin/Massive Attack/Mezzanine/01 Angel.m4a
Last-Modified: 2012-09-05T19:38:17Z
Artist: Massive Attack
Album: Mezzanine
Title: Angel
Track: 1/11
Genre: Electronic
Date: 1998-04-20T07:00:00Z
Disc: 1/1
AlbumArtist: Massive Attack
Time: 380
file: gavin/Eels/Shrek 2/07 I Need Some Sleep.mp3
Last-Modified: 2005-01-14T21:24:25Z
Artist: Eels
Title: I Need Some Sleep
Album: Shrek 2
Track: 7/14
Date: 2004
Genre: Soundtrack
Time: 147

我个人使用 ruby-mpd 库以丰富的 full-featured 方式提供与 MPD 通信的便捷接口。

mpd mpc查询语言

mpd mpc query language

mpd