code.delx.au - pulseaudio/blob - polyp/oss-util.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <assert.h>
  27 #include <sys/soundcard.h>
  28 #include <sys/ioctl.h>
  29 #include <stdio.h>
  30 #include <errno.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <fcntl.h>
  36
  37 #include "oss-util.h"
  38
  39 int pa_oss_open(const char *device, int *mode, int* pcaps) {
  40     int fd = -1;
  41     assert(device && mode && (*mode == O_RDWR || *mode == O_RDONLY || *mode == O_WRONLY));
  42
  43     if (*mode == O_RDWR) {
  44         if ((fd = open(device, O_RDWR|O_NDELAY)) >= 0) {
  45             int dcaps, *tcaps;
  46             ioctl(fd, SNDCTL_DSP_SETDUPLEX, 0);
  47
  48             tcaps = pcaps ? pcaps : &dcaps;
  49
  50             if (ioctl(fd, SNDCTL_DSP_GETCAPS, tcaps) < 0) {
  51                 fprintf(stderr, __FILE__": SNDCTL_DSP_GETCAPS: %s\n", strerror(errno));
  52                 goto fail;
  53             }
  54
  55             if (*tcaps & DSP_CAP_DUPLEX)
  56                 return fd;
  57
  58             close(fd);
  59         }
  60
  61         if ((fd = open(device, (*mode = O_WRONLY)|O_NDELAY)) < 0) {
  62             if ((fd = open(device, (*mode = O_RDONLY)|O_NDELAY)) < 0) {
  63                 fprintf(stderr, __FILE__": open('%s'): %s\n", device, strerror(errno));
  64                 goto fail;
  65             }
  66         }
  67     } else {
  68         if ((fd = open(device, *mode|O_NDELAY)) < 0) {
  69             fprintf(stderr, __FILE__": open('%s'): %s\n", device, strerror(errno));
  70             goto fail;
  71         }
  72     }
  73
  74     if (pcaps) {
  75         if (ioctl(fd, SNDCTL_DSP_GETCAPS, pcaps) < 0) {
  76             fprintf(stderr, "SNDCTL_DSP_GETCAPS: %s\n", strerror(errno));
  77             goto fail;
  78         }
  79     }
  80
  81     return fd;
  82
  83 fail:
  84     if (fd >= 0)
  85         close(fd);
  86     return fd;
  87 }
  88
  89 int pa_oss_auto_format(int fd, struct pa_sample_spec *ss) {
  90     int format, channels, speed, reqformat;
  91     static const int format_trans[] = {
  92         [PA_SAMPLE_U8] = AFMT_U8,
  93         [PA_SAMPLE_ALAW] = AFMT_A_LAW,
  94         [PA_SAMPLE_ULAW] = AFMT_MU_LAW,
  95         [PA_SAMPLE_S16LE] = AFMT_S16_LE,
  96         [PA_SAMPLE_S16BE] = AFMT_S16_BE,
  97         [PA_SAMPLE_FLOAT32LE] = AFMT_QUERY, /* not supported */
  98         [PA_SAMPLE_FLOAT32BE] = AFMT_QUERY, /* not supported */
  99     };
 100
 101     assert(fd >= 0 && ss);
 102
 103     reqformat = format = format_trans[ss->format];
 104     if (reqformat == AFMT_QUERY || ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != reqformat) {
 105         format = AFMT_S16_NE;
 106         if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != AFMT_S16_NE) {
 107             int f = AFMT_S16_NE == AFMT_S16_LE ? AFMT_S16_BE : AFMT_S16_LE;
 108             format = f;
 109             if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != f) {
 110                 format = AFMT_U8;
 111                 if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != AFMT_U8) {
 112                     fprintf(stderr, "SNDCTL_DSP_SETFMT: %s\n", format != AFMT_U8 ? "No supported sample format" : strerror(errno));
 113                     return -1;
 114                 } else
 115                     ss->format = PA_SAMPLE_U8;
 116             } else
 117                 ss->format = f == AFMT_S16_LE ? PA_SAMPLE_S16LE : PA_SAMPLE_S16BE;
 118         } else
 119             ss->format = PA_SAMPLE_S16NE;
 120     }
 121
 122     channels = ss->channels;
 123     if (ioctl(fd, SNDCTL_DSP_CHANNELS, &channels) < 0) {
 124         fprintf(stderr, "SNDCTL_DSP_CHANNELS: %s\n", strerror(errno));
 125         return -1;
 126     }
 127     assert(channels);
 128     ss->channels = channels;
 129
 130     speed = ss->rate;
 131     if (ioctl(fd, SNDCTL_DSP_SPEED, &speed) < 0) {
 132         fprintf(stderr, "SNDCTL_DSP_SPEED: %s\n", strerror(errno));
 133         return -1;
 134     }
 135     assert(speed);
 136     ss->rate = speed;
 137
 138     return 0;
 139 }
 140
 141 static int log2(int v) {
 142     int k = 0;
 143
 144     for (;;) {
 145         v >>= 1;
 146         if (!v) break;
 147         k++;
 148     }
 149
 150     return k;
 151 }
 152
 153 int pa_oss_set_fragments(int fd, int nfrags, int frag_size) {
 154     int arg;
 155     arg = ((int) nfrags << 16) | log2(frag_size);
 156
 157     if (ioctl(fd, SNDCTL_DSP_SETFRAGMENT, &arg) < 0) {
 158         fprintf(stderr, "SNDCTL_DSP_SETFRAGMENT: %s\n", strerror(errno));
 159         return -1;
 160     }
 161
 162     return 0;
 163 }