mirror of
https://github.com/mpv-player/mpv
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fa44281fc5
(patch submitted by Johansson <ajh@atri.curtin.edu.au>) git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@4509 b3059339-0415-0410-9bf9-f77b7e298cf2
216 lines
15 KiB
HTML
216 lines
15 KiB
HTML
<HTML>
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<BODY BGCOLOR=white>
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<FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>
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<P><B><A NAME=2.3.2>2.3.2. Audio output devices</A></P></B>
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<P><B>MPlayer</B>'s audio interface is called <I>libao2</I>. It currently
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contains these drivers :</P>
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<TABLE BORDER=0>
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<TD COLSPAN=4><P><B><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>General:</B></P></TD>
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<TR><TD> </TD><TD VALIGN=top><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>oss</TD><TD> </TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS (ioctl) driver</TD></TR>
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<TR><TD></TD><TD VALIGN=top><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>sdl</TD><TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>SDL driver (supports up/downsampling, <B>ESD</B>, <B>ARTS</B> etc)</TD></TR>
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<TR><TD></TD><TD VALIGN=top><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>nas</TD><TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>NAS (Network Audio System) driver</TD></TR>
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<TR><TD></TD><TD VALIGN=top><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>alsa5</TD><TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>native ALSA 0.5 driver</TD></TR>
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<TR><TD></TD><TD VALIGN=top><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>alsa9</TD><TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>native ALSA 0.9 driver (works, but has problems -> use OSS)</TD></TR>
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<TR><TD></TD><TD VALIGN=top><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>sun</TD><TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>SUN audio driver (/dev/audio) for BSD and Solaris8 users</TD></TR>
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</TABLE>
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<P>The fact is, Linux soundcard drivers are usually bad, and always as
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incompatible as they can be. It MAY take a while to find your optimal settings.</P>
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<P><UL>
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<LI>if you have OSS as driver, first try with <I>-ao oss</I> (this is the default).
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If you experience glitches, halts or anything out of the ordinary, have a
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look at <I>-ao sdl</I> (NOTE: of course you'll have to have a new SDL library and its
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devel pair installed). It helps in a lot of cases (it also supports ESD, ARTS, and
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up/downsampling. /esd is GNOME's, arts is KDE's sound daemon/).</LI>
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<LI>if you have ALSA version 0.5, then you ALMOST always have to use <I>-ao alsa5</I> ,
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since 0.5 has buggy OSS emulation code, and will <B>crash MPlayer</B> with
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a message like this:<BR>
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<UL>
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<CODE>DEMUXER: Too many (945 in 8390980 bytes) video packets in the buffer!</CODE></UL>
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</LI>
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<LI>if you have ALSA version 0.9, use <I>-ao oss</I> or <I>-ao sdl</I> as you
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wish. You can also use <I>-ao alsa9</I> as it works now, however it has many
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problems (losing sync, disappearing audio, etc).</LI>
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</UL></P>
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<P>On <B>Solaris/FreeBSD</B> systems, use the SUN audio driver with the
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<I>-ao sun</I> option, otherwise you'll have no video, nor audio playing.</P>
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<P><B><A NAME=2.3.2.1>2.3.2.1. Soundcard experiences, recommendations</A></B></P>
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<P><TABLE BORDER=0 WIDTH=100%>
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<TD COLSPAN=3><B><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>VIA onboard chipset (via82cxxx) 48Khz only</B></TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Driver:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2> from <A HREF="http://sourceforge.net/project/showfiles.php?group_id=3242&release_id=59602">here</A></TD><TR>
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<TD COLSPAN=3><B><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Aureal Vortex 2</B></TD><TR>
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<TD> </TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>no driver</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS/Pro:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OK</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>ALSA:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>no driver</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Max kHz:</TD><TD>48</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Driver:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2><A HREF="http://aureal.sourceforge.net">aureal.sourceforge.net</A></TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Driver2:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2> from <A HREF="http://makacs.poliod.hu/~pontscho/aureal/au88xx-1.1.3.tar.bz2">here</A><BR>
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(<I>buffer size increased to 32k</I>)</TD><TR>
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<TD COLSPAN=3><B><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>GUS PnP</B></TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>no driver</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS/Pro:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OK</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>ALSA:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OK</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Max kHz:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>48</TD><TR>
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<TD COLSPAN=3><B><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>SB Live!</B></TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OK</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>ALSA:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>(?)</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Max kHz:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>48</TD><TR>
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<TD COLSPAN=3><B><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>SB AWE 64</B></TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>max 44kHz</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>ALSA:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>48kHz sounds shit</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Max kHz:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>48</TD><TR>
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<TD COLSPAN=3><B><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Gravis UltraSound ACE</B></TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>not OK</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>ALSA:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OK</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Max kHz:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>44</TD><TR>
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<TD COLSPAN=3><B><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Gravis UltraSound MAX</B></TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OK</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>ALSA:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OK (?)</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Max kHz:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>48</TD><TR>
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<TD COLSPAN=3><B><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>ESS 688</B></TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OK</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>ALSA:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OK (?)</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Max kHz:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>48</TD><TR>
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<TD COLSPAN=3><B><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>C-Media cards (which ones?)</B></TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>not OK (hissing) (?)</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>ALSA:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OK (?)</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Max kHz:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>?</TD><TR>
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<TD COLSPAN=3><B><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Yamaha cards (*ymf*)</B></TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>not OK (?) (maybe -ao sdl)</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>ALSA:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OK only with ALSA 0.5 with OSS emulation <B>AND</B> <I>-ao sdl</I> (!) (?)</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Max kHz:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>?</TD><TR>
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<TD COLSPAN=3><B><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Cards with envy24 chips (like Terratec EWS88MT)</B></TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>?</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS/Pro:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OK</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>ALSA:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>?</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Max kHz:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>?</TD><TR>
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<TD COLSPAN=3><B><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>PC Speaker or DAC</B></TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OSS:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>OK (<I>use the SDL driver : -ao sdl</I>)</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>ALSA:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>no driver</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Max kHz:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>the driver emulates 44.1 maybe more</TD><TR>
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<TD></TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2>Driver:</TD><TD><FONT face="Verdana, Arial, Helvetica, sans-serif" size=2><A HREF="ftp://ftp.infradead.org/pub/pcsp">ftp://ftp.infradead.org/pub/pcsp</A></TD><TR>
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</TABLE></P>
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<P><UL>
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<LI>on Linux, use at least kernel 2.4 if possible, 2.2 isn't tested
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<LI>if sound clicks when playing from CD-ROM, turn on IRQ unmasking !
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for example "hdparm -u1 /dev/cdrom" (see "man hdparm" !!!)
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This is recommended anyways... (for XMMS, etc...)
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Read section <A HREF="cd-dvd.html#4.1">4.1</A>.
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<LI>don't use your soundcard by other application ( for ex. XMMS ) !
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if you use ESD, start MPlayer with the '-vo sdl:esd' option !
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<LI>Please tell us how MPlayer and your soundcard(s) worked together!
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</UL></P>
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<P><B><A NAME=2.3.2.2>2.3.2.2. Audio plugins</B></P>
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<P><B>MPlayer</B> has support for audio plugins. Audio plugins can be used for
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changing the properties of the audio data before the sound reaches the sound
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card. They are enabled using the <CODE>-aop</CODE> switch followed by the
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<CODE>list=plugin1,plugin2,...</CODE> switch. The <CODE>list</CODE> switch is
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required and determines which plugins that should be used and in which order
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they should be executed, example:
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</P>
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<P> <CODE>mplayer media.avi -aop list=resample,format</CODE></P>
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<P>would run the sound through the resampling plugin followed by the format
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plugin.
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</P>
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<P>The plugins can also have switches that changes their behaviour. These
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switches are explained in detail in the sections below. A plugin will execute
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using default settings if it's switches are omitted. Example of how to use
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plugins in combination with plugin specific switches:
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</P>
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<P> <CODE>mplayer media.avi -aop
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list=resample,format:fout=48000:format=0x8</CODE>
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</P>
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<P>would set the output frequency of the resample plugin to 44100Hz and the
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output format of the format plugin to AFMT_U8.
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</P>
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<P>Currently audio plugins can not be used in <B>MEncoder</B>.</P>
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<P><B><A NAME=2.3.2.2.1>2.3.2.2.1. Up/Downsampling</B></P>
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<P><B>MPlayer</B> fully supports up/down sampling of the sound. This plugin can
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for example be used if you have a fixed frequency sound card or if you are
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stuck with an olqd sound card that is only capable of max 44.1kHz.
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Limitations in your hardware are not auto detected, so you have to specify
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the sample frequency explicitly. This plugin has one switch:
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<CODE>fout</CODE> which is used for setting the desired output sample
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frequency, it defaults to 48kHz, and is given in
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<Hz>.
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</P>
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<P>Usage :<BR>
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<CODE>mplayer media.avi -aop list=resample:fout=<required
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frequency in Hz, like 44100></CODE></P>
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<P><B><A NAME=2.3.2.2.2>2.3.2.2.2. Surround Sound decoding</B></P>
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<P><B>MPlayer</b> has an audio plugin that can decode matrix encoded
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surround sound. Dolby Surround is an example of a matrix encoded format.</p>
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<P>Many files with 2 channel audio actually contain matrixed surround
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sound.</p>
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<P>To use this feature, you will need a sound-card supporting at least 4 channels.</P>
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<P>Usage :<BR>
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<CODE>mplayer media.avi -aop list=surround</CODE></P>
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<P><B><A NAME=2.3.2.2.3>2.3.2.2.3. Sample format converter</A></B></P>
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<P>If your sound card driver doesn't support signed 16bit int, this plugin can
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be used to change the format to one which your sound card can understand. It
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has one switch <CODE>format</CODE> which can be set to one of the numbers
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found in libao2/afmt.h. This plugin is hardly ever needed and is intended for
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advanced users. Observe that this plugin only changes the sample format and
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not the sample frequency or the number of channels.
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</P>
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<P>Usage :<BR>
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<CODE>mplayer media.avi -aop
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list=format:format=<required output format></CODE>
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</P>
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<P><B><A NAME=2.3.2.2.4>2.3.2.2.4. Delay</A></B></P>
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<P>This plugin delays the sound and is intended as an example of how to develop
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new plugins. It can not be used for anything useful from users perspective
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and is mentioned here for the sake of completeness only. Do not use this
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plugin unless you are a developer.</P>
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