+/*
+ * This file is part of DisOrder
+ * Copyright (C) 2009 Richard Kettlewell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+/** @file lib/coreaudio.c
+ * @brief Support for @ref BACKEND_COREAUDIO
+ */
+
+#include "common.h"
+
+#if HAVE_COREAUDIO_AUDIOHARDWARE_H
+
+#include "coreaudio.h"
+#include "log.h"
+#include <CoreFoundation/CFString.h>
+
+/** @brief Return the default device ID */
+static AudioDeviceID coreaudio_use_default(void) {
+ OSStatus status;
+ UInt32 propertySize;
+ AudioDeviceID adid;
+
+ /* TODO should we use kAudioHardwarePropertyDefaultSystemOutputDevice
+ * instead? It is listed in the enumeration but is not documented, so we
+ * leave it alone until better information is available. */
+ propertySize = sizeof adid;
+ status = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice,
+ &propertySize, &adid);
+ if(status)
+ fatal(0, "AudioHardwareGetProperty kAudioHardwarePropertyDefaultOutputDevice: %d", (int)status);
+ if(adid == kAudioDeviceUnknown)
+ fatal(0, "no output device");
+ return adid;
+}
+
+/** @brief Find a device by some string
+ * @param selector Selector for property to look for
+ * @param description Property description
+ * @param devs List of device IDs
+ * @param ndevs Number of device IDs in @p devs
+ * @param resultp Where to put device ID
+ * @return 1 if found, 0 if not found
+ */
+static int coreaudio_find_device(AudioObjectPropertySelector selector,
+ //const char *description,
+ const AudioDeviceID *devs,
+ unsigned ndevs,
+ CFStringRef dev,
+ AudioDeviceID *resultp) {
+ OSStatus status;
+ UInt32 propertySize;
+
+ for(unsigned n = 0; n < ndevs; ++n) {
+ CFStringRef name;
+ propertySize = sizeof name;
+ status = AudioDeviceGetProperty(devs[n], 0, FALSE,
+ selector,
+ &propertySize, &name);
+ if(status)
+ fatal(0, "AudioDeviceGetProperty: %d", (int)status);
+#if 0
+ UInt8 output[1024];
+ CFIndex used;
+ CFRange r = { 0, CFStringGetLength(name) };
+ CFStringGetBytes(name, r, kCFStringEncodingUTF8,
+ '?', FALSE, output, sizeof output,
+ &used);
+ output[used] = 0;
+ info("device %u %s: %s", n, description, (char *)output);
+#endif
+ if(CFStringCompare(dev, name,
+ kCFCompareCaseInsensitive|kCFCompareNonliteral)
+ == kCFCompareEqualTo) {
+ *resultp = devs[n];
+ CFRelease(name);
+ return 1;
+ }
+ CFRelease(name);
+ }
+ return 0; /* didn't find it */
+}
+
+/** @brief Identify audio device
+ * @param name Device name
+ * @return Device ID
+ */
+AudioDeviceID coreaudio_getdevice(const char *name) {
+ OSStatus status;
+ UInt32 propertySize;
+ int found;
+ AudioDeviceID adid;
+
+ if(!name
+ || !*name
+ || !strcmp(name, "default"))
+ return coreaudio_use_default();
+ /* Convert the configured device name to a CFString */
+ CFStringRef dev;
+ dev = CFStringCreateWithCString(NULL/*default allocator*/,
+ name,
+ kCFStringEncodingUTF8);
+ if(!dev)
+ fatal(0, "CFStringCreateWithBytes failed");
+ /* Get a list of available devices */
+ AudioDeviceID devs[1024];
+ unsigned ndevs;
+
+ propertySize = sizeof devs;
+ status = AudioHardwareGetProperty(kAudioHardwarePropertyDevices,
+ &propertySize, devs);
+ if(status)
+ fatal(0, "AudioHardwareGetProperty kAudioHardwarePropertyDevices: %d",
+ (int)status);
+ ndevs = propertySize / sizeof *devs;
+ if(!ndevs)
+ fatal(0, "no sound devices found");
+ /* Try looking up by UID first */
+ found = coreaudio_find_device(kAudioDevicePropertyDeviceUID, //"UID",
+ devs, ndevs, dev, &adid);
+ /* Failing that try looking up by name */
+ if(!found)
+ found = coreaudio_find_device(kAudioObjectPropertyName, //"name",
+ devs, ndevs, dev, &adid);
+ CFRelease(dev);
+ if(!found)
+ fatal(0, "cannot find device '%s'", name);
+ return adid;
+}
+
+#endif
+
+/*
+Local Variables:
+c-basic-offset:2
+comment-column:40
+fill-column:79
+indent-tabs-mode:nil
+End:
+*/
~mdw / disorder / commitdiff