Add mac audio capture

 - Add CoreAudio device input capture for mac audio capturing.  The code
   should cover just about everything for capturing mac input device
   audio.  Because of the way mac audio is designed, users may have no
   choice but to obtain the open source soundflower software to capture
   their mac's desktop audio.  It may be necessary for us to distribute
   it with the program as well.

 - Hide event backend

 - Use win32 events for windows

 - Allow timed waits for events

 - Fix a few warnings

libobs/CMakeLists.txt

@@ -22,12 +22,14 @@ add_definitions(-DPTW32_STATIC_LIB)
 if(WIN32)
 	set(libobs_PLATFORM_SOURCES
 		obs-windows.c
+		util/threading-windows.c
 		util/platform-windows.c)
 	set(libobs_PLATFORM_DEPS
 		w32-pthreads)
 elseif(APPLE)
 	set(libobs_PLATFORM_SOURCES
 		obs-cocoa.c
+		util/threading-posix.c
 		util/platform-cocoa.m)
 
 	set_source_files_properties(${libobs_PLATFORM_SOURCES}
@@ -44,6 +46,7 @@ elseif(APPLE)
 elseif(UNIX)
 	set(libobs_PLATFORM_SOURCES
 		obs-nix.c
+		util/threading-posic.c
 		util/platform-nix.c)
 endif()
 

libobs/media-io/audio-io.c

@@ -38,7 +38,7 @@ struct audio_input {
 	void *param;
 };
 
-static inline audio_input_free(struct audio_input *input)
+static inline void audio_input_free(struct audio_input *input)
 {
 	audio_resampler_destroy(input->resampler);
 }
@@ -435,7 +435,7 @@ static void *audio_thread(void *param)
 	uint64_t prev_time = os_gettime_ns() - buffer_time;
 	uint64_t audio_time;
 
-	while (event_try(&audio->stop_event) == EAGAIN) {
+	while (event_try(audio->stop_event) == EAGAIN) {
 		os_sleep_ms(AUDIO_WAIT_TIME);
 
 		pthread_mutex_lock(&audio->line_mutex);
@@ -611,7 +611,7 @@ void audio_output_close(audio_t audio)
 		return;
 
 	if (audio->initialized) {
-		event_signal(&audio->stop_event);
+		event_signal(audio->stop_event);
 		pthread_join(audio->thread, &thread_ret);
 	}
 
@@ -629,7 +629,7 @@ void audio_output_close(audio_t audio)
 		da_free(audio->mix_buffers[i]);
 
 	da_free(audio->inputs);
-	event_destroy(&audio->stop_event);
+	event_destroy(audio->stop_event);
 	pthread_mutex_destroy(&audio->line_mutex);
 	bfree(audio);
 }
@@ -764,7 +764,7 @@ static inline void mul_vol_32bit(void *array, float volume, size_t total_num)
 
 	for (size_t i = 0; i < total_num; i++) {
 		double val = (double)vals[i] / 2147483647.0;
-		double output = val * volume;
+		double output = val * dvol;
 		vals[i] = (int32_t)(CLAMP(output, -1.0, 1.0) * 2147483647.0);
 	}
 }

libobs/media-io/video-io.c

@@ -125,11 +125,11 @@ static void *video_thread(void *param)
 	struct video_output *video = param;
 	uint64_t cur_time = os_gettime_ns();
 
-	while (event_try(&video->stop_event) == EAGAIN) {
+	while (event_try(video->stop_event) == EAGAIN) {
 		/* wait half a frame, update frame */
 		os_sleepto_ns(cur_time += (video->frame_time/2));
 		video->cur_video_time = cur_time;
-		event_signal(&video->update_event);
+		event_signal(video->update_event);
 
 		/* wait another half a frame, swap and output frames */
 		os_sleepto_ns(cur_time += (video->frame_time/2));
@@ -198,8 +198,8 @@ void video_output_close(video_t video)
 		video_input_free(&video->inputs.array[i]);
 	da_free(video->inputs);
 
-	event_destroy(&video->update_event);
-	event_destroy(&video->stop_event);
+	event_destroy(video->update_event);
+	event_destroy(video->stop_event);
 	pthread_mutex_destroy(&video->data_mutex);
 	pthread_mutex_destroy(&video->input_mutex);
 	bfree(video);
@@ -339,8 +339,8 @@ bool video_output_wait(video_t video)
 {
 	if (!video) return false;
 
-	event_wait(&video->update_event);
-	return event_try(&video->stop_event) == EAGAIN;
+	event_wait(video->update_event);
+	return event_try(video->stop_event) == EAGAIN;
 }
 
 uint64_t video_getframetime(video_t video)
@@ -361,8 +361,8 @@ void video_output_stop(video_t video)
 		return;
 
 	if (video->initialized) {
-		event_signal(&video->stop_event);
+		event_signal(video->stop_event);
 		pthread_join(video->thread, &thread_ret);
-		event_signal(&video->update_event);
+		event_signal(video->update_event);
 	}
 }

libobs/media-io/video-scaler-ffmpeg.c

@@ -133,9 +133,9 @@ bool video_scaler_scale(video_scaler_t scaler,
 		return false;
 
 	int ret = sws_scale(scaler->swscale,
-			input, in_linesize,
+			input, (const int *)in_linesize,
 			0, scaler->src_height,
-			output, out_linesize);
+			output, (const int *)out_linesize);
 	if (ret <= 0) {
 		blog(LOG_DEBUG, "video_scaler_scale: sws_scale failed: %d",
 				ret);

libobs/obs-video.c

@@ -421,7 +421,6 @@ void *obs_video_thread(void *param)
 		render_displays();
 
 		output_frame(cur_time);
-
 	}
 
 	UNUSED_PARAMETER(param);

libobs/util/threading-posix.c

@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2014 Hugh Bailey <[email protected]>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifdef __APPLE__
+#include <sys/time.h>
+#endif
+
+#include "bmem.h"
+#include "threading.h"
+
+struct event_data {
+	pthread_mutex_t mutex;
+	pthread_cond_t  cond;
+	volatile bool   signalled;
+	bool            manual;
+};
+
+int event_init(event_t *event, enum event_type type)
+{
+	int code = 0;
+
+	struct event_data *data = bzalloc(sizeof(struct event_data));
+
+	if ((code = pthread_mutex_init(&data->mutex, NULL)) < 0) {
+		bfree(data);
+		return code;
+	}
+
+	if ((code = pthread_cond_init(&data->cond, NULL)) < 0) {
+		pthread_mutex_destroy(&data->mutex);
+		bfree(data);
+		return code;
+	}
+
+	data->manual = (type == EVENT_TYPE_MANUAL);
+	data->signalled = false;
+	*event = data;
+
+	return 0;
+}
+
+void event_destroy(event_t event)
+{
+	if (event) {
+		pthread_mutex_destroy(&event->mutex);
+		pthread_cond_destroy(&event->cond);
+		bfree(event);
+	}
+}
+
+int event_wait(event_t event)
+{
+	int code = 0;
+	pthread_mutex_lock(&event->mutex);
+	if (!event->signalled)
+		code = pthread_cond_wait(&event->cond, &event->mutex);
+
+	if (code == 0) {
+		if (!event->manual)
+			event->signalled = false;
+		pthread_mutex_unlock(&event->mutex);
+	}
+
+	return code;
+}
+
+static inline void add_ms_to_ts(struct timespec *ts,
+		unsigned long milliseconds)
+{
+	ts->tv_sec += milliseconds/1000;
+	ts->tv_nsec += (milliseconds%1000)*1000000;
+	if (ts->tv_nsec > 1000000000) {
+		ts->tv_sec += 1;
+		ts->tv_nsec -= 1000000000;
+	}
+}
+
+int event_timedwait(event_t event, unsigned long milliseconds)
+{
+	int code = 0;
+	pthread_mutex_lock(&event->mutex);
+	if (!event->signalled) {
+		struct timespec ts;
+#ifdef __APPLE__
+		struct timeval tv;
+		gettimeofday(&tv, NULL);
+		ts.tv_sec  = tv.tv_sec;
+		ts.tv_nsec = tv.tv_usec * 1000;
+#else
+		clock_gettime(CLOCK_REALTIME, &ts);
+#endif
+		add_ms_to_ts(&ts, milliseconds);
+		code = pthread_cond_timedwait(&event->cond, &event->mutex, &ts);
+	}
+
+	if (code == 0) {
+		if (!event->manual)
+			event->signalled = false;
+		pthread_mutex_unlock(&event->mutex);
+	}
+
+	return code;
+}
+
+int event_try(event_t event)
+{
+	pthread_mutex_lock(&event->mutex);
+	if (event->signalled) {
+		if (!event->manual)
+			event->signalled = false;
+		pthread_mutex_unlock(&event->mutex);
+		return 0;
+	}
+	pthread_mutex_unlock(&event->mutex);
+
+	return EAGAIN;
+}
+
+int event_signal(event_t event)
+{
+	int code = 0;
+
+	pthread_mutex_lock(&event->mutex);
+	code = pthread_cond_signal(&event->cond);
+	event->signalled = true;
+	pthread_mutex_unlock(&event->mutex);
+
+	return code;
+}
+
+void event_reset(event_t event)
+{
+	pthread_mutex_lock(&event->mutex);
+	event->signalled = false;
+	pthread_mutex_unlock(&event->mutex);
+}

libobs/util/threading-windows.c

@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2014 Hugh Bailey <[email protected]>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "bmem.h"
+#include "threading.h"
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+struct event_data {
+	HANDLE handle;
+};
+
+int event_init(event_t *event, enum event_type type)
+{
+	HANDLE handle;
+	struct event_data *data;
+
+	handle = CreateEvent(NULL, (type == EVENT_TYPE_MANUAL), FALSE, NULL);
+	if (!handle)
+		return -1;
+
+	data = bmalloc(sizeof(struct event_data));
+	data->handle = handle;
+
+	*event = data;
+	return 0;
+}
+
+void event_destroy(event_t event)
+{
+	if (event) {
+		CloseHandle(event->handle);
+		bfree(event);
+	}
+}
+
+int event_wait(event_t event)
+{
+	DWORD code;
+
+	if (!event)
+		return EINVAL;
+
+	code = WaitForSingleObject(event->handle, INFINITE);
+	if (code != WAIT_OBJECT_0)
+		return EINVAL;
+
+	return 0;
+}
+
+int event_timedwait(event_t event, unsigned long milliseconds)
+{
+	DWORD code;
+
+	if (!event)
+		return EINVAL;
+
+	code = WaitForSingleObject(event->handle, milliseconds);
+	if (code == WAIT_TIMEOUT)
+		return ETIMEDOUT;
+	else if (code != WAIT_OBJECT_0)
+		return EINVAL;
+
+	return 0;
+}
+
+int event_try(event_t event)
+{
+	DWORD code;
+
+	if (!event)
+		return EINVAL;
+
+	code = WaitForSingleObject(event->handle, 0);
+	if (code == WAIT_TIMEOUT)
+		return EAGAIN;
+	else if (code != WAIT_OBJECT_0)
+		return EINVAL;
+
+	return 0;
+}
+
+int event_signal(event_t event)
+{
+	if (!event)
+		return EINVAL;
+
+	if (!SetEvent(event->handle))
+		return EINVAL;
+
+	return 0;
+}
+
+void event_reset(event_t event)
+{
+	if (!event)
+		return;
+
+	ResetEvent(event->handle);
+}

libobs/util/threading.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013 Hugh Bailey <[email protected]>
+ * Copyright (c) 2013-2014 Hugh Bailey <[email protected]>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -46,90 +46,22 @@ static inline void pthread_mutex_init_value(pthread_mutex_t *mutex)
 	*mutex = init_val;
 }
 
-struct event_data {
-	pthread_mutex_t mutex;
-	pthread_cond_t  cond;
-	bool            signalled;
-	bool            manual;
-};
-
 enum event_type {
 	EVENT_TYPE_AUTO,
 	EVENT_TYPE_MANUAL
 };
 
-typedef struct event_data event_t;
-
-static inline int event_init(event_t *event, enum event_type type)
-{
-	int code = 0;
-
-	if ((code = pthread_mutex_init(&event->mutex, NULL)) < 0)
-		return code;
-
-	if ((code = pthread_cond_init(&event->cond, NULL)) < 0)
-		pthread_mutex_destroy(&event->mutex);
-
-	event->manual = (type == EVENT_TYPE_MANUAL);
-	event->signalled = false;
-
-	return code;
-}
-
-static inline void event_destroy(event_t *event)
-{
-	if (event) {
-		pthread_mutex_destroy(&event->mutex);
-		pthread_cond_destroy(&event->cond);
-	}
-}
-
-static inline int event_wait(event_t *event)
-{
-	int code = 0;
-	pthread_mutex_lock(&event->mutex);
-	if (event->signalled ||
-		(code = pthread_cond_wait(&event->cond, &event->mutex)) == 0) {
-		if (!event->manual)
-			event->signalled = false;
-		pthread_mutex_unlock(&event->mutex);
-	}
-
-	return code;
-}
+struct event_data;
+typedef struct event_data *event_t;
 
-static inline int event_try(event_t *event)
-{
-	pthread_mutex_lock(&event->mutex);
-	if (event->signalled) {
-		if (!event->manual)
-			event->signalled = false;
-		pthread_mutex_unlock(&event->mutex);
-		return 0;
-	}
-	pthread_mutex_unlock(&event->mutex);
+EXPORT int  event_init(event_t *event, enum event_type type);
+EXPORT void event_destroy(event_t event);
+EXPORT int  event_wait(event_t event);
+EXPORT int  event_timedwait(event_t event, unsigned long milliseconds);
+EXPORT int  event_try(event_t event);
+EXPORT int  event_signal(event_t event);
+EXPORT void event_reset(event_t event);
 
-	return EAGAIN;
-}
-
-static inline int event_signal(event_t *event)
-{
-	int code = 0;
-
-	pthread_mutex_lock(&event->mutex);
-	code = pthread_cond_signal(&event->cond);
-	event->signalled = true;
-	pthread_mutex_unlock(&event->mutex);
-
-	return code;
-}
-
-static inline void event_reset(event_t *event)
-{
-	pthread_mutex_lock(&event->mutex);
-	event->signalled = false;
-	pthread_mutex_unlock(&event->mutex);
-}
 
 #ifdef __cplusplus
 }

obs/window-basic-main.cpp

@@ -66,6 +66,9 @@ void OBSBasic::OBSInit()
 	/* TODO: this is a test */
 	obs_load_module("test-input");
 	obs_load_module("obs-ffmpeg");
+#ifdef __APPLE__
+	obs_load_module("mac-capture");
+#endif
 
 	/* HACK: fixes a qt bug with native widgets with native repaint */
 	ui->previewContainer->repaint();

plugins/CMakeLists.txt

@@ -2,6 +2,8 @@ include_directories(SYSTEM "${CMAKE_SOURCE_DIR}/libobs")
 
 if(WIN32)
 	add_subdirectory(dshow)
+elseif(APPLE)
+	add_subdirectory(mac-capture)
 endif()
 
 add_subdirectory(obs-ffmpeg)

plugins/mac-capture/CMakeLists.txt

@@ -0,0 +1,23 @@
+project(mac-capture)
+
+find_library(COREAUDIO CoreAudio)
+find_library(AUDIOUNIT AudioUnit)
+find_library(COREFOUNDATION CoreFoundation)
+
+include_directories(${COREAUDIO}
+                    ${AUDIOUNIT}
+                    ${COREFOUNDATION})
+
+set(mac-capture_SOURCES
+	plugin-main.c
+	mac-audio.c)
+	
+add_library(mac-capture MODULE
+	${mac-capture_SOURCES})
+target_link_libraries(mac-capture
+	libobs
+	${COREAUDIO}
+	${AUDIOUNIT}
+	${COREFOUNDATION})
+
+install_obs_plugin(mac-capture)

plugins/mac-capture/mac-audio.c

@@ -0,0 +1,618 @@
+#include <AudioUnit/AudioUnit.h>
+#include <CoreFoundation/CFString.h>
+#include <CoreAudio/CoreAudio.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <obs.h>
+#include <util/threading.h>
+#include <util/c99defs.h>
+#include <util/dstr.h>
+
+#include "mac-helpers.h"
+
+#define SCOPE_OUTPUT kAudioUnitScope_Output
+#define SCOPE_INPUT  kAudioUnitScope_Input
+#define SCOPE_GLOBAL kAudioUnitScope_Global
+
+#define BUS_OUTPUT 0
+#define BUS_INPUT  1
+
+#define MAX_DEVICES 20
+
+#define set_property AudioUnitSetProperty
+#define get_property AudioUnitGetProperty
+
+struct coreaudio_data {
+	char               *device_name;
+	char               *device_uid;
+	AudioUnit           unit;
+	AudioDeviceID       device_id;
+	AudioBufferList    *buf_list;
+	bool                au_initialized;
+	bool                active;
+
+	uint32_t            sample_rate;
+	enum audio_format   format;
+	enum speaker_layout speakers;
+
+	pthread_t           reconnect_thread;
+	event_t             exit_event;
+	volatile bool       reconnecting;
+
+	obs_source_t        source;
+};
+
+static bool find_device_id_by_uid(const char *uid, AudioDeviceID *id)
+{
+	OSStatus    stat;
+	UInt32      size = sizeof(AudioDeviceID);
+	CFStringRef cf_uid = CFStringCreateWithCString(NULL, uid,
+			kCFStringEncodingUTF8);
+	CFStringRef qual = NULL;
+	UInt32      qual_size = 0;
+	bool        success;
+
+	AudioObjectPropertyAddress addr = {
+		.mScope   = kAudioObjectPropertyScopeGlobal,
+		.mElement = kAudioObjectPropertyElementMaster
+	};
+
+	bool is_default = (strcmp(uid, "Default") == 0);
+
+	if (is_default) {
+		addr.mSelector = kAudioHardwarePropertyDefaultInputDevice;
+	} else {
+		addr.mSelector = kAudioHardwarePropertyTranslateUIDToDevice;
+		qual      = cf_uid;
+		qual_size = sizeof(CFStringRef);
+	}
+
+	stat = AudioObjectGetPropertyData(kAudioObjectSystemObject, &addr,
+			qual_size, &qual, &size, id);
+	success = (stat == noErr);
+
+	CFRelease(cf_uid);
+	return success;
+}
+
+static inline void ca_warn(struct coreaudio_data *ca, const char *func,
+		const char *format, ...)
+{
+	va_list args;
+	struct dstr str = {0};
+
+	va_start(args, format);
+	dstr_printf(&str, "[%s]:[device '%s'] ", func, ca->device_name);
+	dstr_vcatf(&str, format, args);
+	blog(LOG_WARNING, "%s", str.array);
+	va_end(args);
+}
+
+static inline bool ca_success(OSStatus stat, struct coreaudio_data *ca,
+		const char *func, const char *action)
+{
+	if (stat != noErr) {
+		blog(LOG_WARNING, "[%s]:[device '%s'] %s failed: %d",
+				func, ca->device_name, action, (int)stat);
+		return false;
+	}
+
+	return true;
+}
+
+enum coreaudio_io_type {
+	IO_TYPE_INPUT,
+	IO_TYPE_OUTPUT,
+};
+
+static inline bool enable_io(struct coreaudio_data *ca,
+		enum coreaudio_io_type type, bool enable)
+{
+	UInt32 enable_int = enable;
+	return set_property(ca->unit, kAudioOutputUnitProperty_EnableIO,
+			(type == IO_TYPE_INPUT) ? SCOPE_INPUT : SCOPE_OUTPUT,
+			(type == IO_TYPE_INPUT) ? BUS_INPUT   : BUS_OUTPUT,
+			&enable_int, sizeof(enable_int));
+}
+
+static inline enum audio_format convert_ca_format(UInt32 format_flags,
+		UInt32 bits)
+{
+	bool planar = (format_flags & kAudioFormatFlagIsNonInterleaved) != 0;
+
+	if (format_flags & kAudioFormatFlagIsFloat)
+		return planar ? AUDIO_FORMAT_FLOAT_PLANAR : AUDIO_FORMAT_FLOAT;
+
+	if (!(format_flags & kAudioFormatFlagIsSignedInteger) && bits == 8)
+		return planar ? AUDIO_FORMAT_U8BIT_PLANAR : AUDIO_FORMAT_U8BIT;
+
+	/* not float?  not signed int?  no clue, fail */
+	if ((format_flags & kAudioFormatFlagIsSignedInteger) == 0)
+		return AUDIO_FORMAT_UNKNOWN;
+
+	if (bits == 16)
+		return planar ? AUDIO_FORMAT_16BIT_PLANAR : AUDIO_FORMAT_16BIT;
+	else if (bits == 32)
+		return planar ? AUDIO_FORMAT_32BIT_PLANAR : AUDIO_FORMAT_32BIT;
+
+	return AUDIO_FORMAT_UNKNOWN;
+}
+
+static inline enum speaker_layout convert_ca_speaker_layout(UInt32 channels)
+{
+	/* directly map channel count to enum values */
+	if (channels >= 1 && channels <= 8 && channels != 7)
+		return (enum speaker_layout)channels;
+
+	return SPEAKERS_UNKNOWN;
+}
+
+static bool coreaudio_init_format(struct coreaudio_data *ca)
+{
+	AudioStreamBasicDescription desc;
+	OSStatus stat;
+	UInt32 size = sizeof(desc);
+
+	stat = get_property(ca->unit, kAudioUnitProperty_StreamFormat,
+			SCOPE_INPUT, BUS_INPUT, &desc, &size);
+	if (!ca_success(stat, ca, "coreaudio_init_format", "get input format"))
+		return false;
+
+	stat = set_property(ca->unit, kAudioUnitProperty_StreamFormat,
+			SCOPE_OUTPUT, BUS_INPUT, &desc, size);
+	if (!ca_success(stat, ca, "coreaudio_init_format", "set output format"))
+		return false;
+
+	if (desc.mFormatID != kAudioFormatLinearPCM) {
+		ca_warn(ca, "coreaudio_init_format", "format is not PCM");
+		return false;
+	}
+
+	ca->format = convert_ca_format(desc.mFormatFlags, desc.mBitsPerChannel);
+	if (ca->format == AUDIO_FORMAT_UNKNOWN) {
+		ca_warn(ca, "coreaudio_init_format", "unknown format flags: "
+				"%u, bits: %u",
+				(unsigned int)desc.mFormatFlags,
+				(unsigned int)desc.mBitsPerChannel);
+		return false;
+	}
+
+	ca->sample_rate = (uint32_t)desc.mSampleRate;
+	ca->speakers = convert_ca_speaker_layout(desc.mChannelsPerFrame);
+
+	if (ca->speakers == SPEAKERS_UNKNOWN) {
+		ca_warn(ca, "coreaudio_init_format", "unknown speaker layout: "
+				"%u channels",
+				(unsigned int)desc.mChannelsPerFrame);
+		return false;
+	}
+
+	return true;
+}
+
+static bool coreaudio_init_buffer(struct coreaudio_data *ca)
+{
+	UInt32 buf_size = 0;
+	UInt32 size     = 0;
+	UInt32 frames   = 0;
+	OSStatus stat;
+
+	AudioObjectPropertyAddress addr = {
+		kAudioDevicePropertyStreamConfiguration,
+		kAudioDevicePropertyScopeInput,
+		kAudioObjectPropertyElementMaster
+	};
+
+	stat = AudioObjectGetPropertyDataSize(ca->device_id, &addr, 0, NULL,
+			&buf_size);
+	if (!ca_success(stat, ca, "coreaudio_init_buffer", "get list size"))
+		return false;
+
+	size = sizeof(frames);
+	stat = get_property(ca->unit, kAudioDevicePropertyBufferFrameSize,
+			SCOPE_GLOBAL, 0, &frames, &size);
+	if (!ca_success(stat, ca, "coreaudio_init_buffer", "get frame size"))
+		return false;
+
+	/* ---------------------- */
+
+	ca->buf_list = bmalloc(buf_size);
+
+	stat = AudioObjectGetPropertyData(ca->device_id, &addr, 0, NULL,
+			&buf_size, ca->buf_list);
+	if (!ca_success(stat, ca, "coreaudio_init_buffer", "allocate")) {
+		bfree(ca->buf_list);
+		ca->buf_list = NULL;
+		return false;
+	}
+
+	for (UInt32 i = 0; i < ca->buf_list->mNumberBuffers; i++) {
+		size = ca->buf_list->mBuffers[i].mDataByteSize;
+		ca->buf_list->mBuffers[i].mData = bmalloc(size);
+	}
+	
+	return true;
+}
+
+static void buf_list_free(AudioBufferList *buf_list)
+{
+	if (buf_list) {
+		for (UInt32 i = 0; i < buf_list->mNumberBuffers; i++)
+			bfree(buf_list->mBuffers[i].mData);
+
+		bfree(buf_list);
+	}
+}
+
+static OSStatus input_callback(
+		void *data,
+		AudioUnitRenderActionFlags *action_flags,
+		const AudioTimeStamp *ts_data,
+		UInt32 bus_num,
+		UInt32 frames,
+		AudioBufferList *ignored_buffers)
+{
+	struct coreaudio_data *ca = data;
+	OSStatus stat;
+	struct source_audio audio;
+
+	stat = AudioUnitRender(ca->unit, action_flags, ts_data, bus_num, frames,
+			ca->buf_list);
+	if (!ca_success(stat, ca, "input_callback", "audio retrieval"))
+		return noErr;
+
+	for (UInt32 i = 0; i < ca->buf_list->mNumberBuffers; i++)
+		audio.data[i] = ca->buf_list->mBuffers[i].mData;
+
+	audio.frames          = frames;
+	audio.speakers        = ca->speakers;
+	audio.format          = ca->format;
+	audio.samples_per_sec = ca->sample_rate;
+	audio.timestamp       = ts_data->mHostTime;
+
+	obs_source_output_audio(ca->source, &audio);
+
+	UNUSED_PARAMETER(ignored_buffers);
+	return noErr;
+}
+
+static void coreaudio_stop(struct coreaudio_data *ca);
+static bool coreaudio_init(struct coreaudio_data *ca);
+static void coreaudio_uninit(struct coreaudio_data *ca);
+
+#define RETRY_TIME 3000
+
+static void *reconnect_thread(void *param)
+{
+	struct coreaudio_data *ca = param;
+
+	ca->reconnecting = true;
+
+	while (event_timedwait(ca->exit_event, RETRY_TIME) == ETIMEDOUT) {
+		if (coreaudio_init(ca)) {
+			blog(LOG_INFO, "coreaudio: device '%s' connected",
+					ca->device_name);
+			break;
+		}
+	}
+
+	blog(LOG_DEBUG, "coreaudio: exit the reconnect thread");
+	ca->reconnecting = false;
+	return NULL;
+}
+
+static void coreaudio_begin_reconnect(struct coreaudio_data *ca)
+{
+	int ret;
+
+	if (ca->reconnecting)
+		return;
+
+	ret = pthread_create(&ca->reconnect_thread, NULL, reconnect_thread, ca);
+	if (ret != 0)
+		blog(LOG_WARNING, "[coreaudio_begin_reconnect] failed to "
+		                  "create thread, error code: %d", ret);
+}
+
+static OSStatus disconnection_callback(
+		AudioObjectID id,
+		UInt32 num_addresses,
+		const AudioObjectPropertyAddress addresses[],
+		void *data)
+{
+	struct coreaudio_data *ca = data;
+	UInt32 alive = 0;
+	UInt32 size  = sizeof(alive);
+	OSStatus stat;
+
+	stat = AudioObjectGetPropertyData(id, addresses, 0, NULL, &size,
+			&alive);
+	if (ca_success(stat, ca, "disconnection_callback", "get property")) {
+		if (!alive) {
+			coreaudio_stop(ca);
+			coreaudio_uninit(ca);
+
+			blog(LOG_INFO, "coreaudio: device '%s' disconnected.  "
+			               "attempting to reconnect",
+			               ca->device_name);
+
+			coreaudio_begin_reconnect(ca);
+		}
+	}
+
+	UNUSED_PARAMETER(num_addresses);
+	return noErr;
+}
+
+static const AudioObjectPropertyAddress alive_addr = {
+	kAudioHardwarePropertyDevices,
+	kAudioDevicePropertyScopeInput,
+	kAudioDevicePropertyDeviceIsAlive
+};
+
+static bool coreaudio_init_hooks(struct coreaudio_data *ca)
+{
+	OSStatus stat;
+	AURenderCallbackStruct callback_info = {
+		.inputProc       = input_callback,
+		.inputProcRefCon = ca
+	};
+
+	stat = AudioObjectAddPropertyListener(ca->device_id, &alive_addr,
+			disconnection_callback, ca);
+	if (!ca_success(stat, ca, "coreaudio_init_hooks",
+				"set disconnect callback"))
+		return false;
+
+	stat = set_property(ca->unit, kAudioOutputUnitProperty_SetInputCallback,
+			SCOPE_GLOBAL, 0, &callback_info, sizeof(callback_info));
+	if (!ca_success(stat, ca, "coreaudio_init_hooks", "set input callback"))
+		return false;
+
+	return true;
+}
+
+static void coreaudio_remove_hooks(struct coreaudio_data *ca)
+{
+	AURenderCallbackStruct callback_info = {
+		.inputProc       = NULL,
+		.inputProcRefCon = NULL
+	};
+
+	AudioObjectRemovePropertyListener(ca->device_id, &alive_addr,
+			disconnection_callback, ca);
+
+	set_property(ca->unit, kAudioOutputUnitProperty_SetInputCallback,
+			SCOPE_GLOBAL, 0, &callback_info, sizeof(callback_info));
+}
+
+static bool coreaudio_get_device_name(struct coreaudio_data *ca)
+{
+	CFStringRef cf_name = NULL;
+	UInt32 size = sizeof(CFStringRef);
+	char name[1024];
+
+	const AudioObjectPropertyAddress addr = {
+		kAudioDevicePropertyDeviceNameCFString,
+		kAudioObjectPropertyScopeInput,
+		kAudioObjectPropertyElementMaster
+	};
+
+	OSStatus stat = AudioObjectGetPropertyData(ca->device_id, &addr,
+			0, NULL, &size, &cf_name);
+	if (stat != noErr) {
+		blog(LOG_WARNING, "[coreaudio_get_device_name] failed to "
+		                  "get name: %d", (int)stat);
+		return false;
+	}
+
+	if (!cf_to_cstr(cf_name, name, 1024)) {
+		blog(LOG_WARNING, "[coreaudio_get_device_name] failed to "
+		                  "convert name to cstr for some reason");
+		return false;
+	}
+
+	bfree(ca->device_name);
+	ca->device_name = bstrdup(name);
+
+	CFRelease(cf_name);
+	return true;
+}
+
+static bool coreaudio_start(struct coreaudio_data *ca)
+{
+	OSStatus stat;
+
+	if (ca->active)
+		return true;
+
+	stat = AudioOutputUnitStart(ca->unit);
+	return ca_success(stat, ca, "coreaudio_start", "start audio");
+}
+
+static void coreaudio_stop(struct coreaudio_data *ca)
+{
+	OSStatus stat;
+
+	if (!ca->active)
+		return;
+
+	ca->active = false;
+
+	stat = AudioOutputUnitStop(ca->unit);
+	ca_success(stat, ca, "coreaudio_stop", "stop audio");
+}
+
+static bool coreaudio_init_unit(struct coreaudio_data *ca)
+{
+	AudioComponentDescription desc = {
+		.componentType    = kAudioUnitType_Output,
+		.componentSubType = kAudioUnitSubType_HALOutput
+	};
+
+	AudioComponent component = AudioComponentFindNext(NULL, &desc);
+	if (!component) {
+		ca_warn(ca, "coreaudio_init_unit", "find component failed");
+		return false;
+	}
+
+	OSStatus stat = AudioComponentInstanceNew(component, &ca->unit);
+	if (!ca_success(stat, ca, "coreaudio_init_unit", "instance unit"))
+		return false;
+
+	return true;
+}
+
+static bool coreaudio_init(struct coreaudio_data *ca)
+{
+	OSStatus stat;
+
+	if (ca->au_initialized)
+		return true;
+
+	if (!find_device_id_by_uid(ca->device_uid, &ca->device_id))
+		return false;
+	if (!coreaudio_get_device_name(ca))
+		return false;
+
+	if (!coreaudio_init_unit(ca))
+		return false;
+
+	stat = enable_io(ca, IO_TYPE_INPUT, true);
+	if (!ca_success(stat, ca, "coreaudio_init", "enable input io"))
+		goto fail;
+
+	stat = enable_io(ca, IO_TYPE_OUTPUT, false);
+	if (!ca_success(stat, ca, "coreaudio_init", "disable output io"))
+		goto fail;
+
+	stat = set_property(ca->unit, kAudioOutputUnitProperty_CurrentDevice,
+			SCOPE_GLOBAL, 0, &ca->device_id, sizeof(ca->device_id));
+	if (!ca_success(stat, ca, "coreaudio_init", "set current device"))
+		goto fail;
+
+	if (!coreaudio_init_format(ca))
+		goto fail;
+	if (!coreaudio_init_buffer(ca))
+		goto fail;
+	if (!coreaudio_init_hooks(ca))
+		goto fail;
+
+	stat = AudioUnitInitialize(ca->unit);
+	if (!ca_success(stat, ca, "coreaudio_initialize", "initialize"))
+		goto fail;
+
+	ca->au_initialized = coreaudio_start(ca);
+
+	if (!ca->au_initialized) {
+		buf_list_free(ca->buf_list);
+		ca->buf_list = NULL;
+	} else {
+		blog(LOG_INFO, "coreaudio: device '%s' initialized",
+				ca->device_name);
+
+	}
+
+	return ca->au_initialized;
+
+fail:
+	coreaudio_uninit(ca);
+	return false;
+}
+
+static void coreaudio_try_init(struct coreaudio_data *ca)
+{
+	if (!coreaudio_init(ca)) {
+		blog(LOG_INFO, "coreaudio: failed to find device "
+		               "uid: %s, waiting for connection",
+		               ca->device_uid);
+
+		coreaudio_begin_reconnect(ca);
+	}
+}
+
+static void coreaudio_uninit(struct coreaudio_data *ca)
+{
+	if (!ca->au_initialized)
+		return;
+
+	if (ca->unit) {
+		coreaudio_stop(ca);
+
+		OSStatus stat = AudioUnitUninitialize(ca->unit);
+		ca_success(stat, ca, "coreaudio_uninit", "uninitialize");
+
+		coreaudio_remove_hooks(ca);
+
+		stat = AudioComponentInstanceDispose(ca->unit);
+		ca_success(stat, ca, "coreaudio_uninit", "dispose");
+
+		ca->unit = NULL;
+	}
+
+	ca->au_initialized = false;
+
+	buf_list_free(ca->buf_list);
+	ca->buf_list = NULL;
+}
+
+/* ------------------------------------------------------------------------- */
+
+static const char *coreaudio_getname(const char *locale)
+{
+	/* TODO: Locale */
+	UNUSED_PARAMETER(locale);
+	return "CoreAudio Input";
+}
+
+static void coreaudio_destroy(void *data)
+{
+	struct coreaudio_data *ca = data;
+
+	if (ca) {
+		if (ca->reconnecting) {
+			event_signal(ca->exit_event);
+			pthread_join(ca->reconnect_thread, NULL);
+		}
+
+		coreaudio_uninit(ca);
+
+		if (ca->unit)
+			AudioComponentInstanceDispose(ca->unit);
+
+		event_destroy(ca->exit_event);
+		bfree(ca->device_name);
+		bfree(ca->device_uid);
+		bfree(ca);
+	}
+}
+
+static void *coreaudio_create(obs_data_t settings, obs_source_t source)
+{
+	struct coreaudio_data *ca = bzalloc(sizeof(struct coreaudio_data));
+
+	obs_data_set_default_string(settings, "device_id", "Default");
+
+	if (event_init(&ca->exit_event, EVENT_TYPE_MANUAL) != 0) {
+		blog(LOG_WARNING, "[coreaudio_create] failed to create "
+		                  "semephore: %d", errno);
+		bfree(ca);
+		return NULL;
+	}
+
+	ca->device_uid = bstrdup(obs_data_getstring(settings, "device_id"));
+	ca->source = source;
+
+	coreaudio_try_init(ca);
+	return ca;
+}
+
+struct obs_source_info coreaudio_info = {
+	.id           = "coreaudio_capture",
+	.type         = OBS_SOURCE_TYPE_INPUT,
+	.output_flags = OBS_SOURCE_AUDIO,
+	.getname      = coreaudio_getname,
+	.create       = coreaudio_create,
+	.destroy      = coreaudio_destroy,
+};

plugins/mac-capture/mac-helpers.h

@@ -0,0 +1,16 @@
+#pragma once
+
+static inline bool mac_success(OSStatus stat, const char *action)
+{
+	if (stat != noErr) {
+		blog(LOG_WARNING, "%s failed: %d", action, (int)stat);
+		return false;
+	}
+
+	return true;
+}
+
+static inline bool cf_to_cstr(CFStringRef ref, char *buf, size_t size)
+{
+	return (bool)CFStringGetCString(ref, buf, size, kCFStringEncodingUTF8);
+}

plugins/mac-capture/plugin-main.c

@@ -0,0 +1,13 @@
+#include <obs-module.h>
+
+OBS_DECLARE_MODULE()
+
+extern struct obs_source_info coreaudio_info;
+
+bool obs_module_load(uint32_t libobs_version)
+{
+	obs_register_source(&coreaudio_info);
+
+	UNUSED_PARAMETER(libobs_version);
+	return true;
+}

test/test-input/test-sinewave.c

@@ -28,7 +28,7 @@ static void *sinewave_thread(void *pdata)
 	double cos_val = 0.0;
 	uint8_t bytes[480];
 
-	while (event_try(&swd->event) == EAGAIN) {
+	while (event_try(swd->event) == EAGAIN) {
 		if (!os_sleepto_ns(last_time += 10000000))
 			last_time = os_gettime_ns();
 
@@ -71,11 +71,11 @@ static void sinewave_destroy(void *data)
 	if (swd) {
 		if (swd->initialized_thread) {
 			void *ret;
-			event_signal(&swd->event);
+			event_signal(swd->event);
 			pthread_join(swd->thread, &ret);
 		}
 
-		event_destroy(&swd->event);
+		event_destroy(swd->event);
 		bfree(swd);
 	}
 }