Alc/backends/sndio.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include "alMain.h"
  27 #include "AL/al.h"
  28 #include "AL/alc.h"
  29
  30 #include <sndio.h>
  31
  32
  33 static const ALCchar sndio_device[] = "SndIO Default";
  34
  35
  36 static ALCboolean sndio_load(void)
  37 {
  38     return ALC_TRUE;
  39 }
  40
  41
  42 typedef struct {
  43     struct sio_hdl *sndHandle;
  44
  45     ALvoid *mix_data;
  46     ALsizei data_size;
  47
  48     volatile int killNow;
  49     ALvoid *thread;
  50 } sndio_data;
  51
  52
  53 static ALuint sndio_proc(ALvoid *ptr)
  54 {
  55     ALCdevice *device = ptr;
  56     sndio_data *data = device->ExtraData;
  57     ALsizei frameSize;
  58     size_t wrote;
  59
  60     SetRTPriority();
  61
  62     frameSize = FrameSizeFromDevFmt(device->FmtChans, device->FmtType);
  63
  64     while(!data->killNow && device->Connected)
  65     {
  66         ALsizei len = data->data_size;
  67         ALubyte *WritePtr = data->mix_data;
  68
  69         aluMixData(device, WritePtr, len/frameSize);
  70         while(len > 0 && !data->killNow)
  71         {
  72             wrote = sio_write(data->sndHandle, WritePtr, len);
  73             if(wrote == 0)
  74             {
  75                 ERR("sio_write failed\n");
  76                 aluHandleDisconnect(device);
  77                 break;
  78             }
  79
  80             len -= wrote;
  81             WritePtr += wrote;
  82         }
  83     }
  84
  85     return 0;
  86 }
  87
  88
  89
  90 static ALCenum sndio_open_playback(ALCdevice *device, const ALCchar *deviceName)
  91 {
  92     sndio_data *data;
  93
  94     if(!deviceName)
  95         deviceName = sndio_device;
  96     else if(strcmp(deviceName, sndio_device) != 0)
  97         return ALC_INVALID_VALUE;
  98
  99     data = calloc(1, sizeof(*data));
 100     data->killNow = 0;
 101
 102     data->sndHandle = sio_open(NULL, SIO_PLAY, 0);
 103     if(data->sndHandle == NULL)
 104     {
 105         free(data);
 106         ERR("Could not open device\n");
 107         return ALC_INVALID_VALUE;
 108     }
 109
 110     device->DeviceName = strdup(deviceName);
 111     device->ExtraData = data;
 112
 113     return ALC_NO_ERROR;
 114 }
 115
 116 static void sndio_close_playback(ALCdevice *device)
 117 {
 118     sndio_data *data = device->ExtraData;
 119
 120     sio_close(data->sndHandle);
 121     free(data);
 122     device->ExtraData = NULL;
 123 }
 124
 125 static ALCboolean sndio_reset_playback(ALCdevice *device)
 126 {
 127     sndio_data *data = device->ExtraData;
 128     struct sio_par par;
 129
 130     sio_initpar(&par);
 131
 132     par.rate = device->Frequency;
 133     par.pchan = ((device->FmtChans != DevFmtMono) ? 2 : 1);
 134
 135     switch(device->FmtType)
 136     {
 137         case DevFmtByte:
 138             par.bits = 8;
 139             par.sig = 1;
 140             break;
 141         case DevFmtUByte:
 142             par.bits = 8;
 143             par.sig = 0;
 144             break;
 145         case DevFmtFloat:
 146         case DevFmtShort:
 147             par.bits = 16;
 148             par.sig = 1;
 149             break;
 150         case DevFmtUShort:
 151             par.bits = 16;
 152             par.sig = 0;
 153             break;
 154         case DevFmtInt:
 155             par.bits = 32;
 156             par.sig = 1;
 157             break;
 158         case DevFmtUInt:
 159             par.bits = 32;
 160             par.sig = 0;
 161             break;
 162     }
 163     par.le = SIO_LE_NATIVE;
 164
 165     par.round = device->UpdateSize;
 166     par.appbufsz = device->UpdateSize * (device->NumUpdates-1);
 167     if(!par.appbufsz) par.appbufsz = device->UpdateSize;
 168
 169     if(!sio_setpar(data->sndHandle, &par) || !sio_getpar(data->sndHandle, &par))
 170     {
 171         ERR("Failed to set device parameters\n");
 172         return ALC_FALSE;
 173     }
 174
 175     if(par.bits != par.bps*8)
 176     {
 177         ERR("Padded samples not supported (%u of %u bits)\n", par.bits, par.bps*8);
 178         return ALC_FALSE;
 179     }
 180
 181     device->Frequency = par.rate;
 182     device->FmtChans = ((par.pchan==1) ? DevFmtMono : DevFmtStereo);
 183
 184     if(par.bits == 8 && par.sig == 1)
 185         device->FmtType = DevFmtByte;
 186     else if(par.bits == 8 && par.sig == 0)
 187         device->FmtType = DevFmtUByte;
 188     else if(par.bits == 16 && par.sig == 1)
 189         device->FmtType = DevFmtShort;
 190     else if(par.bits == 16 && par.sig == 0)
 191         device->FmtType = DevFmtUShort;
 192     else if(par.bits == 32 && par.sig == 1)
 193         device->FmtType = DevFmtInt;
 194     else if(par.bits == 32 && par.sig == 0)
 195         device->FmtType = DevFmtUInt;
 196     else
 197     {
 198         ERR("Unhandled sample format: %s %u-bit\n", (par.sig?"signed":"unsigned"), par.bits);
 199         return ALC_FALSE;
 200     }
 201
 202     device->UpdateSize = par.round;
 203     device->NumUpdates = (par.bufsz/par.round) + 1;
 204
 205     SetDefaultChannelOrder(device);
 206
 207     return ALC_TRUE;
 208 }
 209
 210 static ALCboolean sndio_start_playback(ALCdevice *device)
 211 {
 212     sndio_data *data = device->ExtraData;
 213
 214     if(!sio_start(data->sndHandle))
 215     {
 216         ERR("Error starting playback\n");
 217         return ALC_FALSE;
 218     }
 219
 220     data->data_size = device->UpdateSize * FrameSizeFromDevFmt(device->FmtChans, device->FmtType);
 221     data->mix_data = calloc(1, data->data_size);
 222
 223     data->thread = StartThread(sndio_proc, device);
 224     if(data->thread == NULL)
 225     {
 226         sio_stop(data->sndHandle);
 227         free(data->mix_data);
 228         data->mix_data = NULL;
 229         return ALC_FALSE;
 230     }
 231
 232     return ALC_TRUE;
 233 }
 234
 235 static void sndio_stop_playback(ALCdevice *device)
 236 {
 237     sndio_data *data = device->ExtraData;
 238
 239     if(!data->thread)
 240         return;
 241
 242     data->killNow = 1;
 243     StopThread(data->thread);
 244     data->thread = NULL;
 245
 246     data->killNow = 0;
 247     if(!sio_stop(data->sndHandle))
 248         ERR("Error stopping device\n");
 249
 250     free(data->mix_data);
 251     data->mix_data = NULL;
 252 }
 253
 254
 255 static const BackendFuncs sndio_funcs = {
 256     sndio_open_playback,
 257     sndio_close_playback,
 258     sndio_reset_playback,
 259     sndio_start_playback,
 260     sndio_stop_playback,
 261     NULL,
 262     NULL,
 263     NULL,
 264     NULL,
 265     NULL,
 266     NULL
 267 };
 268
 269 ALCboolean alc_sndio_init(BackendFuncs *func_list)
 270 {
 271     if(!sndio_load())
 272         return ALC_FALSE;
 273     *func_list = sndio_funcs;
 274     return ALC_TRUE;
 275 }
 276
 277 void alc_sndio_deinit(void)
 278 {
 279 }
 280
 281 void alc_sndio_probe(enum DevProbe type)
 282 {
 283     switch(type)
 284     {
 285         case ALL_DEVICE_PROBE:
 286             AppendAllDevicesList(sndio_device);
 287             break;
 288         case CAPTURE_DEVICE_PROBE:
 289             break;
 290     }
 291 }