搞定了 MPD + ALSA-OSS 的朋友进来帮忙阿

fluke

用了alsa-oss

所有媒体播放器正常使用oss,唯独MPD不行，起动mpd时显示：

1. 
   
2. [root@sgu fluke]# mpd
   
3. ALSA lib pcm_dmix.c:862:(snd_pcm_dmix_open) unable to open slave
   
4. problems getting ao_driver_info
   
5. you may not have permission to the audio device
   

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我的/etc/asound.conf

1. 
   
2. pcm.dmixer {
   
3.     type dmix
   
4.     ipc_key 1024
   
5.     ipc_key_add_uid false
   
6.     ipc_perm 0666                       # mixing for all users
   
7.     slave {
   
8.         pcm "hw:0,0"
   
9.         period_time 0
   
10.         period_size 1024
    
11.         buffer_size 8192
    
12.         rate 44100
    
13.     }
    
14.     bindings {
    
15.         0 0
    
16.         1 1
    
17.     }
    
18. }
    
19. 
    
20. pcm.dsp0 {
    
21.     type plug
    
22.     slave.pcm "dmixer"
    
23. }
    
24. 
    
25. pcm.!default {
    
26.     type plug
    
27.     slave.pcm "dmixer"
    
28. }
    
29. 
    
30. pcm.default {
    
31.    type plug
    
32.    slave.pcm "dmixer"
    
33. }
    
34. 
    
35. ctl.mixer0 {
    
36.     type hw
    
37.     card 0
    
38. }
    

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我的mpd.conf

1. 
   
2. 
   
3. mixer_type              "alsa"
   
4. mixer_device            "default"
   
5. mixer_control           "PCM"
   
6. 
   
7. # ALSA Audio Output
   
8. #ao_driver              "alsa09"
   
9. ao_driver_options      "dev=hw:0,0"
   

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注释部分也试过打开的。

主板是nforce 的 c51g

tingxx

说你没有权限嘛
查看mpd的配置文件,看里面是不是用nobody来运行的.
办法有两个,一个就是让nobody加入audio组,二就是将nobody改为别的用户

wangyb

gpasswd -a root audio

fluke

不是的，是以root来运行的，mpd.conf下面的选项是给你切换其他用户用的，因为他们不推荐用root来起动。

我的是用root来起动的，并且，root是在audio组里面的了，而且我今天早上开机的时候，先打开了mpd,让他占用了声卡，这样就能运行了，但是其他程序通通不能运行。这个也是我要用alsa-oss的原因，我不想让某程序独占声卡。

另外，在asound.conf的这行 ipc_key_add_uid false，就是防止出现用户问题的，是在gentoo的wiki上面抄下来的。

我想知道你们的配置和我的是不是一样的？

fluke

事情有一点点进展。

用在mpd上用

1. 
   
2. ao_driver_options      "dev=dmixer"
   

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以root打开，这样的话，其他程序也是以root打开就能共享音频，如果是其他用户，就会显示硬件被占用。

如果mpd是以普通用户打开的，其他任何用户打开的任何程序均不能利用音频。在这里，只接用普通用户是不能打开mpd的，显示没有权限，之能在mpd.conf里面设置用一个用户的身份来运行，而程序是要通过root来运行的。

tingxx

我在两台pc上都装过mpd,运行都没有问题.

flycraft

I'm not very sure,but it seems asound.conf is no more needed.

fluke

没有问题的同学能否贴一下这几个文件呢？

/etc/asound.conf or ~/.asoundrc

/mpd.conf or ~/.mpd.conf

另外，mpd没有问题的同时，其他程序能否运行呢？

tingxx

我的archlinux配置alsa就是用了alsaconf,然后在启动的时候加了几个模块,其它地方没有改过.
mpd也只是配置了说明文件中指明 要改的几个地方,像音乐目录,使用什么用户运行之类.

运行当然一切很好,无如在kde下还是gnome下,感觉archlinux下,alsa不用改就是支持多音频的.

tingxx

配置文件如下,那个asound.conf文件我的机子上没有
mpd.conf如下

1. 
   
2. # MPD CONFIG FILE
   
3. # For a full description of all config parameters,
   
4. # Check the mpd man page, "man mpd".
   
5. 
   
6. ##################### REQUIRED ###########################
   
7. port                         "6600"
   
8. music_directory         "~/doc/share/mp3"
   
9. playlist_directory         "~/.mpd/playlists"
   
10. log_file                 "~/.mpd/mpd.log"
    
11. error_file                 "~/.mpd/mpd.error"
    
12. ##########################################################
    
13. 
    
14. ##########################################################
    
15. # EVERYTHING ELSE IS OPTIONAL
    
16. ##########################################################
    
17. 
    
18. ################# FILESYSTEM SETTINGS ####################
    
19. #
    
20. # If the names of files or directories are
    
21. # not correctly displayed then set the
    
22. # following to the filesystem coding.
    
23. #
    
24. #        Usually this is either:
    
25. #        ISO-8859-1 or UTF-8
    
26. #
    
27. # After changing the filesystem_charset
    
28. # you will need to recreate the db:
    
29. #        mpd --create-db
    
30. #
    
31. #filesystem_charset "ISO-8859-1"
    
32. #
    
33. ##########################################################
    
34. 
    
35. #################### OPTIONAL FILES ######################
    
36. #
    
37. # Location of DB file
    
38. #
    
39. #db_file                "~/.mpd/mpd.db"
    
40. #
    
41. # The state file (if set) will be a file
    
42. # for storing all current information
    
43. # (playlist, playing/paused, etc...) from
    
44. # the last MPD session. This will be used
    
45. # to recreate your last MPD session after
    
46. # restart.
    
47. #
    
48. #state_file                "~/.mpd/mpdstate"
    
49. #
    
50. ##########################################################
    
51. 
    
52. 
    
53. ################### VOLUME MIXER #########################
    
54. #
    
55. # Examples:
    
56. # ALSA Mixer
    
57. mixer_type                "alsa"
    
58. mixer_device                "default"
    
59. mixer_control                "PCM"
    
60. #
    
61. # OSS Mixer
    
62. #mixer_type                "oss"
    
63. #mixer_device                 "/dev/mixer"
    
64. #mixer_control                "PCM"
    
65. #
    
66. # Software Mixer
    
67. #mixer_type                "software"
    
68. #
    
69. ##########################################################
    
70. 
    
71. 
    
72. ################## AUDIO OUTPUT ##########################
    
73. #
    
74. # OSS Audio Output
    
75. #ao_driver                 "oss"
    
76. #ao_driver_options         "dsp=/dev/dsp"
    
77. #
    
78. # ALSA Audio Output
    
79. #ao_driver                "alsa09"
    
80. #ao_driver_options        "dev=hw:0,0"
    
81. #
    
82. # Set this if you have problems
    
83. # playing audio files.
    
84. # This will resample your music so
    
85. # that it comes out at the set rate.
    
86. #
    
87. #audio_output_format        "44100:16:2"
    
88. #
    
89. # You should not need mess with
    
90. # this value unless you know
    
91. # what you're doing.
    
92. #
    
93. #audio_write_size        "1024"
    
94. #
    
95. ##########################################################
    
96. 
    
97. ################# REPLAYGAIN #############################
    
98. #
    
99. # Use Replay Gain (album or title)
    
100. #        http://www.replaygain.org
     
101. #
     
102. #replaygain                "album"
     
103. #
     
104. # Sets the pre-amp used for files that have replaygain
     
105. # info.  Valid values are between -15 to 15 (in dB).
     
106. #
     
107. #replaygain_preamp        "0"
     
108. #
     
109. ##########################################################
     
110. 
     
111. 
     
112. ################ OUTPUT BUFFER SETTINGS ##################
     
113. #
     
114. # You should not need to mess with this
     
115. # unless you know what you're doing.
     
116. #
     
117. #audio_buffer_size        "2048"
     
118. #
     
119. # This means exactly what it says, it will
     
120. # buffer your file up to the percentage of
     
121. # the buffer before it begins playing.
     
122. #
     
123. #buffer_before_play         "25%"
     
124. #
     
125. ##########################################################
     
126. 
     
127. 
     
128. ################### HTTP PROXY ###########################
     
129. #
     
130. # http_proxy_host        "proxy.isp.com"
     
131. # http_proxy_port        "8080"
     
132. # http_proxy_user        "user"
     
133. # http_proxy_password        "password"
     
134. #
     
135. ##########################################################
     
136. 
     
137. 
     
138. ################# SECURITY SETTINGS ######################
     
139. #
     
140. # It is encouraged to run MPD as
     
141. # non-superuser.  If you start mpd as root
     
142. # (for example, in an init script), set
     
143. # this value, then  mpd will drop root priveleges
     
144. # and runs as the user specified.
     
145. #
     
146. #user                 "nobody"
     
147. #
     
148. # Set this value if you only have one
     
149. # address you want to allow connection to.
     
150. #
     
151. #bind_to_address         "localhost"
     
152. #
     
153. # If you want to setup MPD to use
     
154. # passwords set them here
     
155. #
     
156. #password                 "password1@read,add,control,admin"
     
157. #password                 "password2@read"
     
158. #
     
159. # Specify permissions used by default when no password is
     
160. # given by for a connection/client.
     
161. #
     
162. #default_permissions        "read,add,control,admin"
     
163. #
     
164. ##########################################
     
165. 
     
166. 
     
167. ################ MISCELLANEOUS OPTIONS ###################
     
168. #
     
169. # This setting exists as precaution against attacks.
     
170. #
     
171. #max_playlist_length         "16384"
     
172. #
     
173. # Valid options are "default", "secure" or "verbose".
     
174. #log_level                "default"
     
175. #
     
176. #connection_timeout         "60"
     
177. #
     
178. # This should be fine for 2-3 people using clients
     
179. # at the same time.
     
180. #
     
181. #max_connections         "5"
     
182. #
     
183. # No need to change these unless you know better.
     
184. #
     
185. #max_command_list_size         "2048"
     
186. #max_output_buffer_size "2048"
     
187. #
     
188. # This will make playlists compatible with normal music
     
189. # players.
     
190. #
     
191. #save_absolute_paths_in_playlists "no"
     
192. #
     
193. ##########################################################
     

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