At Tue, 17 Jul 2007 12:33:36 +0100, Alan Horstmann wrote: > > On Monday 16 July 2007 13:30, you wrote: > > At Mon, 16 Jul 2007 13:40:23 +0100, > > > > Alan Horstmann wrote: > > > Quick questions: > > > > > > 1. Does SALSA provide everything needed by aplay? > > > > Most but not everything. The missing features are: > > - snd_pcm_mmap_read*/write*() (corresponding to -M option) > > - device listing (namehint) > > Thanks. Presumably that explains 'undeclared' error for 'snd_devname_t' and > 'snd_config' when linking aplay code to salsa. I commented out all > applicable bits and it is OK. > > Can salsa-lib be installed at the same time as alsa-lib? There seems to be > conflicts. For now I have uninstalled and installed alternately. For the runtime environment, yes, but not for the development since both salsa and alsa-lib use the same header file location. But, in principle, it doesn't make much sense to use salsa-lib where alsa-lib is available and needed. > I have very crudely hacked the aplay code and included it as a function in > code to make a simple key-press play a set file. Linking -lasound this seems > to work fine. However, linking -lsalsa results in the file playing too fast, > but not as much as double. Probably you are playing the samples with the hardware parameters that the hardware doesn't support. alsa-lib has plugin layer which can convert appropriatley on the fly. > As my experimental system has ice1712 card, I am having to use a 10 track WAV > file S32_LE as I think that is the only format supported, the card working > with 24-bits loose fitted in 32-bits. Is that right? Yes. > Is there still > something that alsa-lib is doing to the data that salsa doesn't? My example > wav file was recorded using standard aplay, and has meaningful sound just on > the first 4 tracks, which appear correctly in pcm out 1-4 (visible in > envy24control), at the correct level, just too fast. The included aplay > correctly reports > > try3.wav' : Signed 32 bit Little Endian, Rate 44100 Hz, Channels 10 > > when begining to play. ice1712 always requires 10-channel interleaved format, regardless how many physical I/O the device has. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
