mdw@git.distorted.org.uk Git - disorder/blob - lib/coreaudio.c

   1 /*
   2  * This file is part of DisOrder
   3  * Copyright (C) 2009 Richard Kettlewell
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 /** @file lib/coreaudio.c
  19  * @brief Support for Apple Core Audio
  20  */
  21
  22 #include "common.h"
  23
  24 #if HAVE_COREAUDIO_AUDIOHARDWARE_H
  25
  26 #include "coreaudio.h"
  27 #include "log.h"
  28 #include "printf.h"
  29 #include <CoreFoundation/CFString.h>
  30 /* evil bodge to work around broken header file */
  31 #undef error
  32 #include <CoreServices/CoreServices.h>
  33 #include <stdarg.h>
  34
  35 /** @brief Report an error with an OSStatus */
  36 void coreaudio_fatal(OSStatus err, const char *fmt, ...) {
  37   va_list ap;
  38   char *msg;
  39
  40   va_start(ap, fmt);
  41   byte_vasprintf(&msg, fmt, ap);
  42   va_end(ap);
  43
  44   disorder_fatal(0, "%s: error %u", msg, (unsigned)err);
  45 }
  46
  47 /** @brief Return the default device ID */
  48 static AudioDeviceID coreaudio_use_default(void) {
  49   OSStatus status;
  50   UInt32 propertySize;
  51   AudioDeviceID adid;
  52
  53   /* TODO should we use kAudioHardwarePropertyDefaultSystemOutputDevice
  54    * instead?  It is listed in the enumeration but is not documented, so we
  55    * leave it alone until better information is available. */
  56   propertySize = sizeof adid;
  57   status = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice,
  58                                     &propertySize, &adid);
  59   if(status)
  60     coreaudio_fatal(status, "AudioHardwareGetProperty kAudioHardwarePropertyDefaultOutputDevice");
  61   if(adid == kAudioDeviceUnknown)
  62     disorder_fatal(0, "no output device");
  63   return adid;
  64 }
  65
  66 /** @brief Find a device by some string
  67  * @param selector Selector for property to look for
  68  * @param devs List of device IDs
  69  * @param ndevs Number of device IDs in @p devs
  70  * @param dev Desired device name
  71  * @param resultp Where to put device ID
  72  * @return 1 if found, 0 if not found
  73  */
  74 static int coreaudio_find_device(AudioObjectPropertySelector selector,
  75                                  //const char *description,
  76                                  const AudioDeviceID *devs,
  77                                  unsigned ndevs,
  78                                  CFStringRef dev,
  79                                  AudioDeviceID *resultp) {
  80   OSStatus status;
  81   UInt32 propertySize;
  82
  83   for(unsigned n = 0; n < ndevs; ++n) {
  84     CFStringRef name;
  85     propertySize = sizeof name;
  86     status = AudioDeviceGetProperty(devs[n], 0, FALSE,
  87                                     selector,
  88                                     &propertySize, &name);
  89     if(status)
  90       coreaudio_fatal(status, "AudioDeviceGetProperty");
  91 #if 0
  92     UInt8 output[1024];
  93     CFIndex used;
  94     CFRange r = { 0, CFStringGetLength(name) };
  95     CFStringGetBytes(name, r, kCFStringEncodingUTF8,
  96                      '?', FALSE, output, sizeof output,
  97                      &used);
  98     output[used] = 0;
  99     disorder_info("device %u %s: %s", n, description, (char *)output);
 100 #endif
 101     if(CFStringCompare(dev, name,
 102                        kCFCompareCaseInsensitive|kCFCompareNonliteral)
 103        == kCFCompareEqualTo) {
 104       *resultp = devs[n];
 105       CFRelease(name);
 106       return 1;
 107     }
 108     CFRelease(name);
 109   }
 110   return 0;                             /* didn't find it */
 111 }
 112
 113 /** @brief Identify audio device
 114  * @param name Device name
 115  * @return Device ID
 116  */
 117 AudioDeviceID coreaudio_getdevice(const char *name) {
 118   OSStatus status;
 119   UInt32 propertySize;
 120   int found;
 121   AudioDeviceID adid;
 122
 123   if(!name
 124      || !*name
 125      || !strcmp(name, "default"))
 126     return coreaudio_use_default();
 127   /* Convert the configured device name to a CFString */
 128   CFStringRef dev;
 129   dev = CFStringCreateWithCString(NULL/*default allocator*/,
 130                                   name,
 131                                   kCFStringEncodingUTF8);
 132   if(!dev)
 133     disorder_fatal(0, "CFStringCreateWithBytes failed");
 134   /* Get a list of available devices */
 135   AudioDeviceID devs[1024];
 136   unsigned ndevs;
 137
 138   propertySize = sizeof devs;
 139   status = AudioHardwareGetProperty(kAudioHardwarePropertyDevices,
 140                                     &propertySize, devs);
 141   if(status)
 142     coreaudio_fatal(status, "AudioHardwareGetProperty kAudioHardwarePropertyDevices");
 143   ndevs = propertySize / sizeof *devs;
 144   if(!ndevs)
 145     disorder_fatal(0, "no sound devices found");
 146   /* Try looking up by UID first */
 147   found = coreaudio_find_device(-1*kAudioDevicePropertyDeviceUID, //"UID",
 148                                 devs, ndevs, dev, &adid);
 149   /* Failing that try looking up by name */
 150   if(!found)
 151     found = coreaudio_find_device(kAudioObjectPropertyName, //"name",
 152                                   devs, ndevs, dev, &adid);
 153   CFRelease(dev);
 154   if(!found)
 155     disorder_fatal(0, "cannot find device '%s'", name);
 156   return adid;
 157 }
 158
 159 #endif
 160
 161 /*
 162 Local Variables:
 163 c-basic-offset:2
 164 comment-column:40
 165 fill-column:79
 166 indent-tabs-mode:nil
 167 End:
 168 */