oss.c

   1 /*
   2  * Copyright 2004-2005 Timo Hirvonen
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  17  * 02111-1307, USA.
  18  */
  19
  20 #include <op.h>
  21 #include <sf.h>
  22 #include <xmalloc.h>
  23 #include <debug.h>
  24
  25 #if defined(__OpenBSD__)
  26 #include <soundcard.h>
  27 #else
  28 #include <sys/soundcard.h>
  29 #endif
  30 #include <sys/ioctl.h>
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <unistd.h>
  34 #include <fcntl.h>
  35
  36 static sample_format_t oss_sf;
  37 static int oss_fd = -1;
  38
  39 /* configuration */
  40 static char *oss_dsp_device = NULL;
  41
  42 static int oss_close(void);
  43
  44 static int oss_reset(void)
  45 {
  46         if (fcntl(oss_fd, SNDCTL_DSP_RESET, 0) == -1) {
  47                 return -1;
  48         }
  49         return 0;
  50 }
  51
  52 static int oss_set_sf(sample_format_t sf)
  53 {
  54         int tmp, log2_fragment_size, nr_fragments, bytes_per_second;
  55
  56         oss_reset();
  57         oss_sf = sf;
  58         tmp = sf_get_channels(oss_sf) - 1;
  59         if (ioctl(oss_fd, SNDCTL_DSP_STEREO, &tmp) == -1) {
  60                 d_print("SNDCTL_DSP_STEREO failed: %s\n", strerror(errno));
  61                 return -1;
  62         }
  63         if (sf_get_bits(oss_sf) == 16) {
  64                 if (sf_get_signed(oss_sf)) {
  65                         if (sf_get_bigendian(oss_sf)) {
  66                                 tmp = AFMT_S16_BE;
  67                         } else {
  68                                 tmp = AFMT_S16_LE;
  69                         }
  70                 } else {
  71                         if (sf_get_bigendian(oss_sf)) {
  72                                 tmp = AFMT_U16_BE;
  73                         } else {
  74                                 tmp = AFMT_U16_LE;
  75                         }
  76                 }
  77         } else if (sf_get_bits(oss_sf) == 8) {
  78                 if (sf_get_signed(oss_sf)) {
  79                         tmp = AFMT_S8;
  80                 } else {
  81                         tmp = AFMT_U8;
  82                 }
  83         } else {
  84                 d_print("bits is neither 8 nor 16\n");
  85                 return -1;
  86         }
  87         if (ioctl(oss_fd, SNDCTL_DSP_SAMPLESIZE, &tmp) == -1) {
  88                 d_print("SNDCTL_DSP_SAMPLESIZE failed: %s\n", strerror(errno));
  89                 return -1;
  90         }
  91         tmp = sf_get_rate(oss_sf);
  92         if (ioctl(oss_fd, SNDCTL_DSP_SPEED, &tmp) == -1) {
  93                 d_print("SNDCTL_DSP_SPEED failed: %s\n", strerror(errno));
  94                 return -1;
  95         }
  96 #if 1
  97         bytes_per_second = sf_get_second_size(oss_sf);
  98         log2_fragment_size = 0;
  99         while (1 << log2_fragment_size < bytes_per_second / 25)
 100                 log2_fragment_size++;
 101         log2_fragment_size--;
 102         nr_fragments = 32;
 103 /*      device_buffer_size = (1 << log2_fragment_size) * (nr_fragments + 1); */
 104         /* bits 0..15 = size of fragment, 16..31 = log2(number of fragments) */
 105         tmp = (nr_fragments << 16) + log2_fragment_size;
 106         d_print("fragment: %d\n", tmp);
 107         if (ioctl(oss_fd, SNDCTL_DSP_SETFRAGMENT, &tmp) == -1) {
 108                 d_print("fragment: %d\n", tmp);
 109                 d_print("SNDCTL_DSP_SETFRAGMENT failed: %s\n", strerror(errno));
 110                 return -1;
 111         }
 112 #endif
 113         return 0;
 114 }
 115
 116 static int oss_device_exists(const char *device)
 117 {
 118         struct stat s;
 119
 120         if (stat(device, &s) == 0) {
 121                 d_print("device %s exists\n", device);
 122                 return 1;
 123         }
 124         d_print("device %s does not exist\n", device);
 125         return 0;
 126 }
 127
 128 static int oss_init(void)
 129 {
 130         const char *new_dsp_dev = "/dev/sound/dsp";
 131         const char *dsp_dev = "/dev/dsp";
 132
 133         if (oss_dsp_device) {
 134                 if (oss_device_exists(oss_dsp_device))
 135                         return 0;
 136                 free(oss_dsp_device);
 137                 oss_dsp_device = NULL;
 138                 return -1;
 139         }
 140         if (oss_device_exists(new_dsp_dev)) {
 141                 oss_dsp_device = xstrdup(new_dsp_dev);
 142                 return 0;
 143         }
 144         if (oss_device_exists(dsp_dev)) {
 145                 oss_dsp_device = xstrdup(dsp_dev);
 146                 return 0;
 147         }
 148         return -1;
 149 }
 150
 151 static int oss_exit(void)
 152 {
 153         free(oss_dsp_device);
 154         oss_dsp_device = NULL;
 155         return 0;
 156 }
 157
 158 static int oss_open(sample_format_t sf)
 159 {
 160         oss_fd = open(oss_dsp_device, O_WRONLY);
 161         if (oss_fd == -1)
 162                 return -1;
 163         if (oss_set_sf(sf) == -1) {
 164                 oss_close();
 165                 return -1;
 166         }
 167         return 0;
 168 }
 169
 170 static int oss_close(void)
 171 {
 172         close(oss_fd);
 173         oss_fd = -1;
 174         return 0;
 175 }
 176
 177 static int oss_write(const char *buffer, int count)
 178 {
 179         int rc;
 180
 181         count /= 4;
 182         count *= 4;
 183         rc = write(oss_fd, buffer, count);
 184         return rc;
 185 }
 186
 187 static int oss_pause(void)
 188 {
 189         if (ioctl(oss_fd, SNDCTL_DSP_POST, NULL) == -1)
 190                 return -1;
 191         return 0;
 192 }
 193
 194 static int oss_unpause(void)
 195 {
 196         return 0;
 197 }
 198
 199 static int oss_buffer_space(void)
 200 {
 201         audio_buf_info info;
 202         int space;
 203
 204         if (ioctl(oss_fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
 205                 return -1;
 206         space = info.bytes;
 207 /*      d_print("%d\n", space); */
 208         return space;
 209 }
 210
 211 static int op_oss_set_option(int key, const char *val)
 212 {
 213         switch (key) {
 214         case 0:
 215                 free(oss_dsp_device);
 216                 oss_dsp_device = xstrdup(val);
 217                 break;
 218         default:
 219                 return -OP_ERROR_NOT_OPTION;
 220         }
 221         return 0;
 222 }
 223
 224 static int op_oss_get_option(int key, char **val)
 225 {
 226         switch (key) {
 227         case 0:
 228                 if (oss_dsp_device)
 229                         *val = xstrdup(oss_dsp_device);
 230                 break;
 231         default:
 232                 return -OP_ERROR_NOT_OPTION;
 233         }
 234         return 0;
 235 }
 236
 237 const struct output_plugin_ops op_pcm_ops = {
 238         .init = oss_init,
 239         .exit = oss_exit,
 240         .open = oss_open,
 241         .close = oss_close,
 242         .write = oss_write,
 243         .pause = oss_pause,
 244         .unpause = oss_unpause,
 245         .buffer_space = oss_buffer_space,
 246         .set_option = op_oss_set_option,
 247         .get_option = op_oss_get_option
 248 };
 249
 250 const char * const op_pcm_options[] = {
 251         "device",
 252         NULL
 253 };
 254
 255 const int op_priority = 1;