Clemens Ladisch wrote: > Takashi Iwai wrote: >> Timur Tabi wrote: >>> I'm having a hard time understand when ALSA does sample rate and format >>> conversion, and when it doesn't. >>> >>> When I issue the following command: >>> >>> mplayer -ao alsa filename.mov -v >>> >>> I get this output: >>> ... >>> alsa-init: using device default >>> alsa-init: format s24le are not supported by hardware >>> >>> I was under the impression that ALSA can do format and sample rate conversion if >>> necessary, but I guess that's not always the case. >> It does. mplayer seems to try first the hardware device without >> conversion and falls back to "default" PCM. > > In this case, it uses only the "default" PCM device. There seems to be > some problem with its definition. > > Are there any definitions in ~/.asoundrc or /etc/asound.conf? If not, > what driver is used, and does it have a file in /usr/share/alsa/cards/? Ok, I made some progress. According to http://alsa.opensrc.org/.asoundrc, because I'm using ALSA 1.0.8, I need to have an .asoundrc. So I added this .asoundrc: pcm.!default { type hw card 0 } ctl.!default { type hw card 0 } And now sample rate conversion works! However, sample format conversion does not work. When I try to play a movie with an s24le sound track, I get this: $ MPlayer-1.0rc1/mplayer -ao alsa video/320x240/sm3_sneak_peek.mov MPlayer 1.0rc1-3.3.5 (C) 2000-2006 MPlayer Team AltiVec found CPU: PowerPC Playing video/320x240/sm3_sneak_peek.mov. ISO: File Type Major Brand: Original QuickTime Quicktime/MOV file format detected. VIDEO: [avc1] 320x240 24bpp 29.970 fps 0.0 kbps ( 0.0 kbyte/s) vo: couldn't open the X11 display ()! vo: couldn't open the X11 display ()! VO XOverlay need a subdriver vo: couldn't open the X11 display ()! ========================================================================== Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264) ========================================================================== ========================================================================== Opening audio decoder: [pcm] Uncompressed PCM audio decoder AUDIO: 48000 Hz, 2 ch, s24le, 2304.0 kbit/100.00% (ratio: 288000->288000) Selected audio codec: [pcm] afm: pcm (Uncompressed PCM) ========================================================================== alsa-init: format s24le are not supported by hardware, trying default alsa-init: unable to set format: Invalid argument Could not open/initialize audio device -> no sound. Audio: no sound Starting playback... VDec: vo config request - 320 x 240 (preferred colorspace: Planar YV12) Could not find matching colorspace - retrying with -vf scale... Opening video filter: [scale] VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is undefined - no prescaling applied. SwScaler: using unscaled yuv420p -> rgb32 special converter VO: [fbdev] 320x240 => 320x240 ARGB V: 2.4 74/ 74 4% 5% 0.0% 0 0 Exiting... (Quit) Does this mean that sample rate conversion is supported, but not sample format conversion? _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
