oss_api.c

   1 /*
   2  * oss_api.c -- useful functions to record playback using oss driver
   3  *
   4  * author: hackbard@hackdaworld.dyndns.org
   5  *
   6  */
   7
   8 #include <stdio.h>
   9 #include <sys/ioctl.h>
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12 #include <sys/soundcard.h>
  13 #include <fcntl.h>
  14 #include <unistd.h>
  15 #include <errno.h>
  16
  17 #include "oss_api.h"
  18
  19 int get_dsp_cap(int fd,dsp_set *set,unsigned char print) {
  20         if(ioctl(fd,SNDCTL_DSP_GETCAPS,&(set->cap))==-1) {
  21                 perror("SNDCTL_DSP_GETCAPS");
  22                 return -1;
  23         }
  24
  25         if(print) {
  26                 printf("device capabilities:\n\n");
  27                 printf("revision: %x\n",set->cap&DSP_CAP_REVISION);
  28                 printf("full duplex:\t%c\n",set->cap&DSP_CAP_DUPLEX?'y':'n');
  29                 printf("real time:\t%c\n",set->cap&DSP_CAP_REALTIME?'y':'n');
  30                 printf("int. buf:\t%c\n",set->cap&DSP_CAP_BATCH?'y':'n');
  31                 printf("coprociessor:\t%c\n",set->cap&DSP_CAP_COPROC?'y':'n');
  32                 printf("trigger:\t%c\n",set->cap&DSP_CAP_TRIGGER?'y':'n');
  33                 printf("support mmap:\t%c\n",set->cap&DSP_CAP_MMAP?'y':'n');
  34                 printf("multiple open:\t%c\n",set->cap&DSP_CAP_MULTI?'y':'n');
  35                 printf("chan binding:\t%c\n",set->cap&DSP_CAP_BIND?'y':'n');
  36         }
  37
  38         return 1;
  39 }
  40
  41 int set_dsp(int fd,dsp_set *set) {
  42         int tmp;
  43
  44         tmp=set->format;
  45         if(ioctl(fd,SNDCTL_DSP_SETFMT,&(set->format))==-1) {
  46                 perror("SNDCTL_DSP_SETFMT");
  47                 return -1;
  48         }
  49         if(set->format!=tmp) {
  50                 printf("format (%d) not supported!\n",tmp);
  51                 return -1;
  52         }
  53         tmp=set->channel;
  54         if(ioctl(fd,SNDCTL_DSP_CHANNELS,&(set->channel))==-1) {
  55                 perror("SNDCTL_DSP_CHANNELS");
  56                 return -1;
  57         }
  58         if(set->channel!=tmp) {
  59                 printf("%d-channel use not supported!\n",tmp);
  60                 return -1;
  61         }
  62         tmp=set->freq;
  63         if(ioctl(fd,SNDCTL_DSP_SPEED,&(set->freq))==-1) {
  64                 perror("SNDCTL_DSP_SPEED");
  65                 return -1;
  66         }
  67         if(set->freq!=tmp) {
  68                 printf("%d hz not suported!\n",tmp);
  69                 return -1;
  70         }
  71         if(ioctl(fd,SNDCTL_DSP_GETBLKSIZE,&(set->bufsize))==-1) {
  72                 perror("SOUNDCTL_DSP_GETBLKSIZE");
  73                 return -1;
  74         }
  75         printf("\n\nSOUNDCTL_DSP_GETBLKSIZE = %d\n\n",set->bufsize);
  76
  77         return 1;
  78 }
  79
  80 int open_sound_dev(char *dev,int mode) {
  81         int fd;
  82
  83         if((fd=open(dev,mode))==-1) {
  84                 perror("open");
  85                 return -1;
  86         }
  87
  88         return fd;
  89 }
  90
  91 int open_file(char *file,int mode) {
  92         int fd;
  93
  94         if(mode) {
  95                 if((fd=open(file,mode,S_IRWXU))==-1) {
  96                         perror("open");
  97                         return -1;
  98                 }
  99         } else {
 100                 if((fd=open(file,mode))==-1) {
 101                         perror("open");
 102                         return -1;
 103                 }
 104         }
 105
 106         return fd;
 107 }
 108
 109 int close_it(int fd) {
 110         if(close(fd)==-1) {
 111                 perror("close");
 112                 return -1;
 113         }
 114
 115         return 1;
 116 }
 117