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* Describes the Linux Sound system support
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* ----- ----- ---------------
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* 27Oct96 1.0 Initial Program Built from generic filter.c
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* Reports mixer capabilities etc.
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* 18Nov96 1.1 Added DSP info
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* Copyright (C) 1997-2008 Jim Jackson jj@franjam.org.uk
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program - see the file COPYING; if not, write to
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* the Free Software Foundation, Inc., 675 Mass Ave, Cambridge,
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soundinfo: (version 1) 27Oct96
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soundinfo - Describes the Linux Sound system support
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soundinfo [-v] [options]
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Describes the Linux Sound system support on the system. Mixer devices,
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This program is covered by the GNU General Public License, see file
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COPYING for further details.
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Any questions, suggestions or problems, etc. should be sent to
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Email Internet: jj@franjam.org.uk
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#include <sys/types.h>
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#include <sys/soundcard.h>
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#include <linux/soundcard.h>
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#define VERSION "2.3.10 (May 2008)"
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#define MIXDEV "/dev/mixer"
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#define DSPDEV "/dev/dsp"
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#define chkword(a,b) ((n>=a)&&(strncmp(p,b,n)==0))
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short int debug; /* set if the -d flag is used */
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short int vflg; /* set if -v flag used */
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/* declare non-int functions
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char *delnl(),*reads(),*sindex(),
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*sindex_nc(),*tab(),*ctime();
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FILE *fopen(),*mfopen();
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/* main - for program soundinfo
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* Describes the Linux Sound system support
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char fname[132],*fnm,*p;
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if ((p=strrchr(sys,'/'))!=NULL) { sys=p+1; }
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printf("%s Ver. %s (c) 1996-2008 Jim Jackson\n",sys,VERSION);
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while (argc && **argv=='-') /* all flags and options must come */
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{ n=strlen(p=(*argv++)+1); argc--; /* before paramters */
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if (*p==0) n=atoi(p+1); /* e.g. num. option -n23 */
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else /* check for single char. flags */
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{ if (*p=='h') exit(help(EFAIL));
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else if (*p=='d') debug=TRUE;
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else if (*p=='v') vflg=TRUE;
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{ *fname='-'; *(fname+1)=*p; *(fname+2)=0;
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exit(help(err_rpt(EINVAL,fname)));
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if ((fd = open(fnm=MIXDEV, O_RDONLY)) < 0) {
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if ((fd = open(fnm=DSPDEV, O_RDWR)) < 0) {
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/* help(e) print brief help message - return parameter given
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Describes some features of the Linux Sound system support in the kernel.\n\
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int caps,fmts,blksize;
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audio_buf_info auobf,auibf;
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if (ioctl(fd, SNDCTL_DSP_GETCAPS , &caps) < 0) {
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return(err_rpt(errno,"Reading DSP capabilities."));
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if (ioctl(fd, SNDCTL_DSP_GETFMTS , &fmts) < 0) {
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return(err_rpt(errno,"Reading DSP formats."));
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if (ioctl(fd, SNDCTL_DSP_GETBLKSIZE , &blksize) < 0) {
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return(err_rpt(errno,"Reading blocksize."));
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if (ioctl(fd, SNDCTL_DSP_GETOSPACE, &auobf) < 0) {
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return(err_rpt(errno,"Reading output audio buffer info."));
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if (ioctl(fd, SNDCTL_DSP_GETISPACE, &auibf) < 0) {
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return(err_rpt(errno,"Reading input audio buffer info."));
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printf("\nDSP details ................\n");
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printf(" capabilities = 0x%09X\n formats = 0x%09X\n",caps,fmts);
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printf(" blocksize = %d\n", blksize);
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printf("\nDSP Capability revision level %d\n",caps&255);
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printf(" %s duplex operation (simultaneous read/write)\n",
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(caps&DSP_CAP_DUPLEX)?"Supports":"Does not support");
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if (caps&DSP_CAP_REALTIME)
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printf(" Supports RealTime capability.\n" );
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if (caps&DSP_CAP_BATCH)
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printf(" Has batch facilities (buffers) which may cause timing problems etc.\n");
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if (caps&DSP_CAP_COPROC)
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printf(" Has a Co-Processor\n");
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printf(" %s SETTRIGGER operation.\n",
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(caps&DSP_CAP_TRIGGER)?"Supports":"Does not support");
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printf("\nDSP Formats supported are :-\n");
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if (fmts&AFMT_MU_LAW) printf(" Mu_Law ");
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if (fmts&AFMT_A_LAW) printf(" A_Law ");
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if (fmts&AFMT_IMA_ADPCM) printf(" IMA_ADPCM ");
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if (fmts&AFMT_U8) printf(" U8 ");
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if (fmts&AFMT_S16_LE) printf(" S16_LE ");
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if (fmts&AFMT_S16_BE) printf(" S16_BE ");
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if (fmts&AFMT_S8) printf(" S8 ");
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if (fmts&AFMT_U16_LE) printf(" U16_LE ");
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if (fmts&AFMT_U16_BE) printf(" U16_BE ");
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if (fmts&AFMT_MPEG) printf(" MPEG ");
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printf("Fragment details Output.. Input..\n");
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printf(" total fragments %4d %4d\n",
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auobf.fragstotal,auibf.fragstotal);
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printf(" available %4d %4d\n",
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auobf.fragments,auibf.fragments);
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printf(" fragment size %5d %5d\n",
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auobf.fragsize,auibf.fragsize);
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printf(" bytes available %6d %6d\n\n",
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auobf.bytes,auibf.bytes);
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int devmask,recmask,sources,stereodevs,capabilities;
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char *devname[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_LABELS;
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int level[SOUND_MIXER_NRDEVICES];
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struct mixer_info Mix_Info;
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if (ioctl(fd, SOUND_MIXER_INFO, &Mix_Info) < 0) {
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err_rpt(errno,"Getting mixer_info details.");
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Mix_Info.id[0]=Mix_Info.name[0]=0;
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if (ioctl(fd, SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
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return(err_rpt(errno,"Reading Mixer Channels."));
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return(err_rpt(ENODEV,"Mixer has no Channels!"));
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if (ioctl(fd, SOUND_MIXER_READ_RECMASK, &recmask) < 0) {
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return(err_rpt(errno,"Reading Recording Mask."));
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if (ioctl(fd, SOUND_MIXER_READ_RECSRC, &sources) < 0) {
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return(err_rpt(errno,"Reading Recording Devices."));
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if (ioctl(fd, SOUND_MIXER_READ_STEREODEVS, &stereodevs) < 0) {
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return(err_rpt(errno,"Reading Stereo Devices."));
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if (ioctl(fd, SOUND_MIXER_READ_CAPS, &capabilities) < 0) {
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return(err_rpt(errno,"Reading Mixer Capabilities."));
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printf("MIXER DETAILS ......................\n");
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printf(" Mixer Id = %s\n Name = %s\n",Mix_Info.id,Mix_Info.name);
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printf(" devmask = 0x%09X\n recmask = 0x%09X\n",devmask,recmask);
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printf(" sources = 0x%09X\n stereodevs = 0x%09X\n",sources,stereodevs);
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printf("MIXER capabilities = 0x%09X\n",capabilities);
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if (capabilities & SOUND_CAP_EXCL_INPUT)
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printf(" Only one sound source can be selected at a time.\n");
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printf("\nMIXER (%s) has following channels, set as :-\n",dev);
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for (i=0; i<SOUND_MIXER_NRDEVICES; i++) {
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if (devmask & (1<<i)) {
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if (ioctl(fd, MIXER_READ(i), &n) < 0) {
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sprintf(buf,"Problem reading current level of mixer channel %s.",
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printf(" [0x%08X] %2d %-6s %3d",1<<i,i,devname[i],n&255);
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if (stereodevs & (1<<i)) { printf("/%3d ",(n>>8)&255);
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} else { printf(" "); }
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printf("%9s ", (recmask & (1<<i))? "source":"");
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printf("%10s ", (sources & (1<<i))? "selected":"");
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if (err) fprintf(stderr,"[%s] %s : %s\n",sys,strerror(err),msg);
added
removed
.pc/non-linux.diff/soundinfo.c
