obs-studio/libobs/obs.c

/******************************************************************************
    Copyright (C) 2013-2014 by Hugh Bailey <[email protected]>

    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 2 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/>.
******************************************************************************/

#include <inttypes.h>

#include "graphics/matrix4.h"
#include "callback/calldata.h"

#include "obs.h"
#include "obs-internal.h"

struct obs_core *obs = NULL;

extern void add_default_module_paths(void);
extern char *find_libobs_data_file(const char *file);

static inline void make_video_info(struct video_output_info *vi,
		struct obs_video_info *ovi)
{
	vi->name    = "video";
	vi->format  = ovi->output_format;
	vi->fps_num = ovi->fps_num;
	vi->fps_den = ovi->fps_den;
	vi->width   = ovi->output_width;
	vi->height  = ovi->output_height;
	vi->range   = ovi->range;
	vi->colorspace = ovi->colorspace;
	vi->cache_size = 6;
}

#define PIXEL_SIZE 4

#define GET_ALIGN(val, align) \
	(((val) + (align-1)) & ~(align-1))

static inline void set_420p_sizes(const struct obs_video_info *ovi)
{
	struct obs_core_video *video = &obs->video;
	uint32_t chroma_pixels;
	uint32_t total_bytes;

	chroma_pixels = (ovi->output_width * ovi->output_height / 4);
	chroma_pixels = GET_ALIGN(chroma_pixels, PIXEL_SIZE);

	video->plane_offsets[0] = 0;
	video->plane_offsets[1] = ovi->output_width * ovi->output_height;
	video->plane_offsets[2] = video->plane_offsets[1] + chroma_pixels;

	video->plane_linewidth[0] = ovi->output_width;
	video->plane_linewidth[1] = ovi->output_width/2;
	video->plane_linewidth[2] = ovi->output_width/2;

	video->plane_sizes[0] = video->plane_offsets[1];
	video->plane_sizes[1] = video->plane_sizes[0]/4;
	video->plane_sizes[2] = video->plane_sizes[1];

	total_bytes = video->plane_offsets[2] + chroma_pixels;

	video->conversion_height =
		(total_bytes/PIXEL_SIZE + ovi->output_width-1) /
		ovi->output_width;

	video->conversion_height = GET_ALIGN(video->conversion_height, 2);
	video->conversion_tech = "Planar420";
}

static inline void set_nv12_sizes(const struct obs_video_info *ovi)
{
	struct obs_core_video *video = &obs->video;
	uint32_t chroma_pixels;
	uint32_t total_bytes;

	chroma_pixels = (ovi->output_width * ovi->output_height / 2);
	chroma_pixels = GET_ALIGN(chroma_pixels, PIXEL_SIZE);

	video->plane_offsets[0] = 0;
	video->plane_offsets[1] = ovi->output_width * ovi->output_height;

	video->plane_linewidth[0] = ovi->output_width;
	video->plane_linewidth[1] = ovi->output_width;

	video->plane_sizes[0] = video->plane_offsets[1];
	video->plane_sizes[1] = video->plane_sizes[0]/2;

	total_bytes = video->plane_offsets[1] + chroma_pixels;

	video->conversion_height =
		(total_bytes/PIXEL_SIZE + ovi->output_width-1) /
		ovi->output_width;

	video->conversion_height = GET_ALIGN(video->conversion_height, 2);
	video->conversion_tech = "NV12";
}

static inline void set_444p_sizes(const struct obs_video_info *ovi)
{
	struct obs_core_video *video = &obs->video;
	uint32_t chroma_pixels;
	uint32_t total_bytes;

	chroma_pixels = (ovi->output_width * ovi->output_height);
	chroma_pixels = GET_ALIGN(chroma_pixels, PIXEL_SIZE);

	video->plane_offsets[0] = 0;
	video->plane_offsets[1] = chroma_pixels;
	video->plane_offsets[2] = chroma_pixels + chroma_pixels;

	video->plane_linewidth[0] = ovi->output_width;
	video->plane_linewidth[1] = ovi->output_width;
	video->plane_linewidth[2] = ovi->output_width;

	video->plane_sizes[0] = chroma_pixels;
	video->plane_sizes[1] = chroma_pixels;
	video->plane_sizes[2] = chroma_pixels;

	total_bytes = video->plane_offsets[2] + chroma_pixels;

	video->conversion_height =
		(total_bytes/PIXEL_SIZE + ovi->output_width-1) /
		ovi->output_width;

	video->conversion_height = GET_ALIGN(video->conversion_height, 2);
	video->conversion_tech = "Planar444";
}

static inline void calc_gpu_conversion_sizes(const struct obs_video_info *ovi)
{
	obs->video.conversion_height = 0;
	memset(obs->video.plane_offsets, 0, sizeof(obs->video.plane_offsets));
	memset(obs->video.plane_sizes, 0, sizeof(obs->video.plane_sizes));
	memset(obs->video.plane_linewidth, 0,
		sizeof(obs->video.plane_linewidth));

	switch ((uint32_t)ovi->output_format) {
	case VIDEO_FORMAT_I420:
		set_420p_sizes(ovi);
		break;
	case VIDEO_FORMAT_NV12:
		set_nv12_sizes(ovi);
		break;
	case VIDEO_FORMAT_I444:
		set_444p_sizes(ovi);
		break;
	}
}

static bool obs_init_gpu_conversion(struct obs_video_info *ovi)
{
	struct obs_core_video *video = &obs->video;

	calc_gpu_conversion_sizes(ovi);

	if (!video->conversion_height) {
		blog(LOG_INFO, "GPU conversion not available for format: %u",
				(unsigned int)ovi->output_format);
		video->gpu_conversion = false;
		return true;
	}

	for (size_t i = 0; i < NUM_TEXTURES; i++) {
		video->convert_textures[i] = gs_texture_create(
				ovi->output_width, video->conversion_height,
				GS_RGBA, 1, NULL, GS_RENDER_TARGET);

		if (!video->convert_textures[i])
			return false;
	}

	return true;
}

static bool obs_init_textures(struct obs_video_info *ovi)
{
	struct obs_core_video *video = &obs->video;
	uint32_t output_height = video->gpu_conversion ?
		video->conversion_height : ovi->output_height;
	size_t i;

	for (i = 0; i < NUM_TEXTURES; i++) {
		video->copy_surfaces[i] = gs_stagesurface_create(
				ovi->output_width, output_height, GS_RGBA);

		if (!video->copy_surfaces[i])
			return false;

		video->render_textures[i] = gs_texture_create(
				ovi->base_width, ovi->base_height,
				GS_RGBA, 1, NULL, GS_RENDER_TARGET);

		if (!video->render_textures[i])
			return false;

		video->output_textures[i] = gs_texture_create(
				ovi->output_width, ovi->output_height,
				GS_RGBA, 1, NULL, GS_RENDER_TARGET);

		if (!video->output_textures[i])
			return false;
	}

	return true;
}

gs_effect_t *obs_load_effect(gs_effect_t **effect, const char *file)
{
	if (!*effect) {
		char *filename = find_libobs_data_file(file);
		*effect = gs_effect_create_from_file(filename, NULL);
		bfree(filename);
	}

	return *effect;
}

static int obs_init_graphics(struct obs_video_info *ovi)
{
	struct obs_core_video *video = &obs->video;
	uint8_t transparent_tex_data[2*2*4] = {0};
	const uint8_t *transparent_tex = transparent_tex_data;
	struct gs_sampler_info point_sampler = {0};
	bool success = true;
	int errorcode;

	errorcode = gs_create(&video->graphics, ovi->graphics_module,
			ovi->adapter);
	if (errorcode != GS_SUCCESS) {
		switch (errorcode) {
		case GS_ERROR_MODULE_NOT_FOUND:
			return OBS_VIDEO_MODULE_NOT_FOUND;
		case GS_ERROR_NOT_SUPPORTED:
			return OBS_VIDEO_NOT_SUPPORTED;
		default:
			return OBS_VIDEO_FAIL;
		}
	}

	gs_enter_context(video->graphics);

	char *filename = find_libobs_data_file("default.effect");
	video->default_effect = gs_effect_create_from_file(filename,
			NULL);
	bfree(filename);

	if (gs_get_device_type() == GS_DEVICE_OPENGL) {
		filename = find_libobs_data_file("default_rect.effect");
		video->default_rect_effect = gs_effect_create_from_file(
				filename, NULL);
		bfree(filename);
	}

	filename = find_libobs_data_file("opaque.effect");
	video->opaque_effect = gs_effect_create_from_file(filename,
			NULL);
	bfree(filename);

	filename = find_libobs_data_file("solid.effect");
	video->solid_effect = gs_effect_create_from_file(filename,
			NULL);
	bfree(filename);

	filename = find_libobs_data_file("format_conversion.effect");
	video->conversion_effect = gs_effect_create_from_file(filename,
			NULL);
	bfree(filename);

	filename = find_libobs_data_file("bicubic_scale.effect");
	video->bicubic_effect = gs_effect_create_from_file(filename,
			NULL);
	bfree(filename);

	filename = find_libobs_data_file("lanczos_scale.effect");
	video->lanczos_effect = gs_effect_create_from_file(filename,
			NULL);
	bfree(filename);

	filename = find_libobs_data_file("bilinear_lowres_scale.effect");
	video->bilinear_lowres_effect = gs_effect_create_from_file(filename,
			NULL);
	bfree(filename);

	filename = find_libobs_data_file("premultiplied_alpha.effect");
	video->premultiplied_alpha_effect = gs_effect_create_from_file(filename,
			NULL);
	bfree(filename);

	video->point_sampler = gs_samplerstate_create(&point_sampler);

	obs->video.transparent_texture = gs_texture_create(2, 2, GS_RGBA, 1,
			&transparent_tex, 0);

	if (!video->default_effect)
		success = false;
	if (gs_get_device_type() == GS_DEVICE_OPENGL) {
		if (!video->default_rect_effect)
			success = false;
	}
	if (!video->opaque_effect)
		success = false;
	if (!video->solid_effect)
		success = false;
	if (!video->conversion_effect)
		success = false;
	if (!video->premultiplied_alpha_effect)
		success = false;
	if (!video->transparent_texture)
		success = false;
	if (!video->point_sampler)
		success = false;

	gs_leave_context();
	return success ? OBS_VIDEO_SUCCESS : OBS_VIDEO_FAIL;
}

static inline void set_video_matrix(struct obs_core_video *video,
		struct obs_video_info *ovi)
{
	struct matrix4 mat;
	struct vec4 r_row;

	if (format_is_yuv(ovi->output_format)) {
		video_format_get_parameters(ovi->colorspace, ovi->range,
				(float*)&mat, NULL, NULL);
		matrix4_inv(&mat, &mat);

		/* swap R and G */
		r_row = mat.x;
		mat.x = mat.y;
		mat.y = r_row;
	} else {
		matrix4_identity(&mat);
	}

	memcpy(video->color_matrix, &mat, sizeof(float) * 16);
}

static int obs_init_video(struct obs_video_info *ovi)
{
	struct obs_core_video *video = &obs->video;
	struct video_output_info vi;
	int errorcode;

	make_video_info(&vi, ovi);
	video->base_width     = ovi->base_width;
	video->base_height    = ovi->base_height;
	video->output_width   = ovi->output_width;
	video->output_height  = ovi->output_height;
	video->gpu_conversion = ovi->gpu_conversion;
	video->scale_type     = ovi->scale_type;

	set_video_matrix(video, ovi);

	errorcode = video_output_open(&video->video, &vi);

	if (errorcode != VIDEO_OUTPUT_SUCCESS) {
		if (errorcode == VIDEO_OUTPUT_INVALIDPARAM) {
			blog(LOG_ERROR, "Invalid video parameters specified");
			return OBS_VIDEO_INVALID_PARAM;
		} else {
			blog(LOG_ERROR, "Could not open video output");
		}
		return OBS_VIDEO_FAIL;
	}

	gs_enter_context(video->graphics);

	if (ovi->gpu_conversion && !obs_init_gpu_conversion(ovi))
		return OBS_VIDEO_FAIL;
	if (!obs_init_textures(ovi))
		return OBS_VIDEO_FAIL;

	gs_leave_context();

	errorcode = pthread_create(&video->video_thread, NULL,
			obs_video_thread, obs);
	if (errorcode != 0)
		return OBS_VIDEO_FAIL;

	video->thread_initialized = true;
	video->ovi = *ovi;
	return OBS_VIDEO_SUCCESS;
}

static void stop_video(void)
{
	struct obs_core_video *video = &obs->video;
	void *thread_retval;

	if (video->video) {
		video_output_stop(video->video);
		if (video->thread_initialized) {
			pthread_join(video->video_thread, &thread_retval);
			video->thread_initialized = false;
		}
	}

}

static void obs_free_video(void)
{
	struct obs_core_video *video = &obs->video;

	if (video->video) {
		video_output_close(video->video);
		video->video = NULL;

		if (!video->graphics)
			return;

		gs_enter_context(video->graphics);

		if (video->mapped_surface) {
			gs_stagesurface_unmap(video->mapped_surface);
			video->mapped_surface = NULL;
		}

		for (size_t i = 0; i < NUM_TEXTURES; i++) {
			gs_stagesurface_destroy(video->copy_surfaces[i]);
			gs_texture_destroy(video->render_textures[i]);
			gs_texture_destroy(video->convert_textures[i]);
			gs_texture_destroy(video->output_textures[i]);

			video->copy_surfaces[i]    = NULL;
			video->render_textures[i]  = NULL;
			video->convert_textures[i] = NULL;
			video->output_textures[i]  = NULL;
		}

		gs_leave_context();

		circlebuf_free(&video->vframe_info_buffer);

		memset(&video->textures_rendered, 0,
				sizeof(video->textures_rendered));
		memset(&video->textures_output, 0,
				sizeof(video->textures_output));
		memset(&video->textures_copied, 0,
				sizeof(video->textures_copied));
		memset(&video->textures_converted, 0,
				sizeof(video->textures_converted));

		video->cur_texture = 0;
	}
}

static void obs_free_graphics(void)
{
	struct obs_core_video *video = &obs->video;

	if (video->graphics) {
		gs_enter_context(video->graphics);

		gs_texture_destroy(video->transparent_texture);

		gs_samplerstate_destroy(video->point_sampler);

		gs_effect_destroy(video->default_effect);
		gs_effect_destroy(video->default_rect_effect);
		gs_effect_destroy(video->opaque_effect);
		gs_effect_destroy(video->solid_effect);
		gs_effect_destroy(video->conversion_effect);
		gs_effect_destroy(video->bicubic_effect);
		gs_effect_destroy(video->lanczos_effect);
		gs_effect_destroy(video->bilinear_lowres_effect);
		video->default_effect = NULL;

		gs_leave_context();

		gs_destroy(video->graphics);
		video->graphics = NULL;
	}
}

static bool obs_init_audio(struct audio_output_info *ai)
{
	struct obs_core_audio *audio = &obs->audio;
	int errorcode;

	pthread_mutexattr_t attr;

	pthread_mutex_init_value(&audio->monitoring_mutex);

	if (pthread_mutexattr_init(&attr) != 0)
		return false;
	if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0)
		return false;
	if (pthread_mutex_init(&audio->monitoring_mutex, &attr) != 0)
		return false;

	audio->user_volume    = 1.0f;

	audio->monitoring_device_name = bstrdup("Default");
	audio->monitoring_device_id = bstrdup("default");

	errorcode = audio_output_open(&audio->audio, ai);
	if (errorcode == AUDIO_OUTPUT_SUCCESS)
		return true;
	else if (errorcode == AUDIO_OUTPUT_INVALIDPARAM)
		blog(LOG_ERROR, "Invalid audio parameters specified");
	else
		blog(LOG_ERROR, "Could not open audio output");

	return false;
}

static void obs_free_audio(void)
{
	struct obs_core_audio *audio = &obs->audio;
	if (audio->audio)
		audio_output_close(audio->audio);

	circlebuf_free(&audio->buffered_timestamps);
	da_free(audio->render_order);
	da_free(audio->root_nodes);

	da_free(audio->monitors);
	bfree(audio->monitoring_device_name);
	bfree(audio->monitoring_device_id);
	pthread_mutex_destroy(&audio->monitoring_mutex);

	memset(audio, 0, sizeof(struct obs_core_audio));
}

static bool obs_init_data(void)
{
	struct obs_core_data *data = &obs->data;
	pthread_mutexattr_t attr;

	assert(data != NULL);

	pthread_mutex_init_value(&obs->data.displays_mutex);
	pthread_mutex_init_value(&obs->data.draw_callbacks_mutex);

	if (pthread_mutexattr_init(&attr) != 0)
		return false;
	if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0)
		goto fail;
	if (pthread_mutex_init(&data->sources_mutex, &attr) != 0)
		goto fail;
	if (pthread_mutex_init(&data->audio_sources_mutex, &attr) != 0)
		goto fail;
	if (pthread_mutex_init(&data->displays_mutex, &attr) != 0)
		goto fail;
	if (pthread_mutex_init(&data->outputs_mutex, &attr) != 0)
		goto fail;
	if (pthread_mutex_init(&data->encoders_mutex, &attr) != 0)
		goto fail;
	if (pthread_mutex_init(&data->services_mutex, &attr) != 0)
		goto fail;
	if (pthread_mutex_init(&obs->data.draw_callbacks_mutex, NULL) != 0)
		goto fail;
	if (!obs_view_init(&data->main_view))
		goto fail;

	data->valid = true;

fail:
	pthread_mutexattr_destroy(&attr);
	return data->valid;
}

void obs_main_view_free(struct obs_view *view)
{
	if (!view) return;

	for (size_t i = 0; i < MAX_CHANNELS; i++)
		obs_source_release(view->channels[i]);

	memset(view->channels, 0, sizeof(view->channels));
	pthread_mutex_destroy(&view->channels_mutex);
}

#define FREE_OBS_LINKED_LIST(type) \
	do { \
		int unfreed = 0; \
		while (data->first_ ## type ) { \
			obs_ ## type ## _destroy(data->first_ ## type ); \
			unfreed++; \
		} \
		if (unfreed) \
			blog(LOG_INFO, "\t%d " #type "(s) were remaining", \
					unfreed); \
	} while (false)

static void obs_free_data(void)
{
	struct obs_core_data *data = &obs->data;

	data->valid = false;

	obs_main_view_free(&data->main_view);

	blog(LOG_INFO, "Freeing OBS context data");

	FREE_OBS_LINKED_LIST(source);
	FREE_OBS_LINKED_LIST(output);
	FREE_OBS_LINKED_LIST(encoder);
	FREE_OBS_LINKED_LIST(display);
	FREE_OBS_LINKED_LIST(service);

	pthread_mutex_destroy(&data->sources_mutex);
	pthread_mutex_destroy(&data->audio_sources_mutex);
	pthread_mutex_destroy(&data->displays_mutex);
	pthread_mutex_destroy(&data->outputs_mutex);
	pthread_mutex_destroy(&data->encoders_mutex);
	pthread_mutex_destroy(&data->services_mutex);
	pthread_mutex_destroy(&data->draw_callbacks_mutex);
	da_free(data->draw_callbacks);
}

static const char *obs_signals[] = {
	"void source_create(ptr source)",
	"void source_destroy(ptr source)",
	"void source_remove(ptr source)",
	"void source_save(ptr source)",
	"void source_load(ptr source)",
	"void source_activate(ptr source)",
	"void source_deactivate(ptr source)",
	"void source_show(ptr source)",
	"void source_hide(ptr source)",
	"void source_rename(ptr source, string new_name, string prev_name)",
	"void source_volume(ptr source, in out float volume)",
	"void source_volume_level(ptr source, float level, float magnitude, "
		"float peak)",
	"void source_transition_start(ptr source)",
	"void source_transition_video_stop(ptr source)",
	"void source_transition_stop(ptr source)",

	"void channel_change(int channel, in out ptr source, ptr prev_source)",
	"void master_volume(in out float volume)",

	"void hotkey_layout_change()",
	"void hotkey_register(ptr hotkey)",
	"void hotkey_unregister(ptr hotkey)",
	"void hotkey_bindings_changed(ptr hotkey)",

	NULL
};

static inline bool obs_init_handlers(void)
{
	obs->signals = signal_handler_create();
	if (!obs->signals)
		return false;

	obs->procs   = proc_handler_create();
	if (!obs->procs)
		return false;

	return signal_handler_add_array(obs->signals, obs_signals);
}

static pthread_once_t obs_pthread_once_init_token = PTHREAD_ONCE_INIT;
static inline bool obs_init_hotkeys(void)
{
	struct obs_core_hotkeys *hotkeys = &obs->hotkeys;
	pthread_mutexattr_t attr;
	bool success = false;

	assert(hotkeys != NULL);

	da_init(hotkeys->hotkeys);
	hotkeys->signals = obs->signals;
	hotkeys->name_map_init_token = obs_pthread_once_init_token;
	hotkeys->mute = bstrdup("Mute");
	hotkeys->unmute = bstrdup("Unmute");
	hotkeys->push_to_mute = bstrdup("Push-to-mute");
	hotkeys->push_to_talk = bstrdup("Push-to-talk");
	hotkeys->sceneitem_show = bstrdup("Show '%1'");
	hotkeys->sceneitem_hide = bstrdup("Hide '%1'");

	if (!obs_hotkeys_platform_init(hotkeys))
		return false;

	if (pthread_mutexattr_init(&attr) != 0)
		return false;
	if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0)
		goto fail;
	if (pthread_mutex_init(&hotkeys->mutex, &attr) != 0)
		goto fail;

	if (os_event_init(&hotkeys->stop_event, OS_EVENT_TYPE_MANUAL) != 0)
		goto fail;
	if (pthread_create(&hotkeys->hotkey_thread, NULL,
			obs_hotkey_thread, NULL))
		goto fail;

	hotkeys->hotkey_thread_initialized = true;

	success = true;

fail:
	pthread_mutexattr_destroy(&attr);
	return success;
}

static inline void stop_hotkeys(void)
{
	struct obs_core_hotkeys *hotkeys = &obs->hotkeys;
	void *thread_ret;

	if (hotkeys->hotkey_thread_initialized) {
		os_event_signal(hotkeys->stop_event);
		pthread_join(hotkeys->hotkey_thread, &thread_ret);
		hotkeys->hotkey_thread_initialized = false;
	}

	os_event_destroy(hotkeys->stop_event);
	obs_hotkeys_free();
}

static inline void obs_free_hotkeys(void)
{
	struct obs_core_hotkeys *hotkeys = &obs->hotkeys;

	bfree(hotkeys->mute);
	bfree(hotkeys->unmute);
	bfree(hotkeys->push_to_mute);
	bfree(hotkeys->push_to_talk);
	bfree(hotkeys->sceneitem_show);
	bfree(hotkeys->sceneitem_hide);

	obs_hotkey_name_map_free();

	obs_hotkeys_platform_free(hotkeys);
	pthread_mutex_destroy(&hotkeys->mutex);
}

extern const struct obs_source_info scene_info;

extern void log_system_info(void);

static bool obs_init(const char *locale, const char *module_config_path,
		profiler_name_store_t *store)
{
	obs = bzalloc(sizeof(struct obs_core));

	pthread_mutex_init_value(&obs->audio.monitoring_mutex);

	obs->name_store_owned = !store;
	obs->name_store = store ? store : profiler_name_store_create();
	if (!obs->name_store) {
		blog(LOG_ERROR, "Couldn't create profiler name store");
		return false;
	}

	log_system_info();

	if (!obs_init_data())
		return false;
	if (!obs_init_handlers())
		return false;
	if (!obs_init_hotkeys())
		return false;

	if (module_config_path)
		obs->module_config_path = bstrdup(module_config_path);
	obs->locale = bstrdup(locale);
	obs_register_source(&scene_info);
	add_default_module_paths();
	return true;
}

#ifdef _WIN32
extern void initialize_crash_handler(void);
extern void initialize_com(void);
extern void uninitialize_com(void);
#endif

static const char *obs_startup_name = "obs_startup";
bool obs_startup(const char *locale, const char *module_config_path,
		profiler_name_store_t *store)
{
	bool success;

	profile_start(obs_startup_name);

	if (obs) {
		blog(LOG_WARNING, "Tried to call obs_startup more than once");
		return false;
	}

#ifdef _WIN32
	initialize_crash_handler();
	initialize_com();
#endif

	success = obs_init(locale, module_config_path, store);
	profile_end(obs_startup_name);
	if (!success)
		obs_shutdown();

	return success;
}

void obs_shutdown(void)
{
	struct obs_module *module;

	if (!obs)
		return;

#define FREE_REGISTERED_TYPES(structure, list) \
	do { \
		for (size_t i = 0; i < list.num; i++) { \
			struct structure *item = &list.array[i]; \
			if (item->type_data && item->free_type_data) \
				item->free_type_data(item->type_data); \
		} \
		da_free(list); \
	} while (false)

	FREE_REGISTERED_TYPES(obs_source_info, obs->source_types);
	FREE_REGISTERED_TYPES(obs_output_info, obs->output_types);
	FREE_REGISTERED_TYPES(obs_encoder_info, obs->encoder_types);
	FREE_REGISTERED_TYPES(obs_service_info, obs->service_types);
	FREE_REGISTERED_TYPES(obs_modal_ui, obs->modal_ui_callbacks);
	FREE_REGISTERED_TYPES(obs_modeless_ui, obs->modeless_ui_callbacks);

#undef FREE_REGISTERED_TYPES

	da_free(obs->input_types);
	da_free(obs->filter_types);
	da_free(obs->transition_types);

	stop_video();
	stop_hotkeys();

	obs_free_audio();
	obs_free_data();
	obs_free_video();
	obs_free_hotkeys();
	obs_free_graphics();
	proc_handler_destroy(obs->procs);
	signal_handler_destroy(obs->signals);
	obs->procs = NULL;
	obs->signals = NULL;

	module = obs->first_module;
	while (module) {
		struct obs_module *next = module->next;
		free_module(module);
		module = next;
	}
	obs->first_module = NULL;

	for (size_t i = 0; i < obs->module_paths.num; i++)
		free_module_path(obs->module_paths.array+i);
	da_free(obs->module_paths);

	if (obs->name_store_owned)
		profiler_name_store_free(obs->name_store);

	bfree(obs->module_config_path);
	bfree(obs->locale);
	bfree(obs);
	obs = NULL;

#ifdef _WIN32
	uninitialize_com();
#endif
}

bool obs_initialized(void)
{
	return obs != NULL;
}

uint32_t obs_get_version(void)
{
	return LIBOBS_API_VER;
}

void obs_set_locale(const char *locale)
{
	struct obs_module *module;
	if (!obs)
		return;

	if (obs->locale)
		bfree(obs->locale);
	obs->locale = bstrdup(locale);

	module = obs->first_module;
	while (module) {
		if (module->set_locale)
			module->set_locale(locale);

		module = module->next;
	}
}

const char *obs_get_locale(void)
{
	return obs ? obs->locale : NULL;
}

#define OBS_SIZE_MIN 2
#define OBS_SIZE_MAX (32 * 1024)

static inline bool size_valid(uint32_t width, uint32_t height)
{
	return (width >= OBS_SIZE_MIN && height >= OBS_SIZE_MIN &&
	        width <= OBS_SIZE_MAX && height <= OBS_SIZE_MAX);
}

int obs_reset_video(struct obs_video_info *ovi)
{
	if (!obs) return OBS_VIDEO_FAIL;

	/* don't allow changing of video settings if active. */
	if (obs->video.video && video_output_active(obs->video.video))
		return OBS_VIDEO_CURRENTLY_ACTIVE;

	if (!size_valid(ovi->output_width, ovi->output_height) ||
	    !size_valid(ovi->base_width,   ovi->base_height))
		return OBS_VIDEO_INVALID_PARAM;

	struct obs_core_video *video = &obs->video;

	stop_video();
	obs_free_video();

	/* align to multiple-of-two and SSE alignment sizes */
	ovi->output_width  &= 0xFFFFFFFC;
	ovi->output_height &= 0xFFFFFFFE;

	if (!video->graphics) {
		int errorcode = obs_init_graphics(ovi);
		if (errorcode != OBS_VIDEO_SUCCESS) {
			obs_free_graphics();
			return errorcode;
		}
	}

	const char *scale_type_name = "";
	switch (ovi->scale_type) {
	case OBS_SCALE_DISABLE:
		scale_type_name = "Disabled";
		break;
	case OBS_SCALE_POINT:
		scale_type_name = "Point";
		break;
	case OBS_SCALE_BICUBIC:
		scale_type_name = "Bicubic";
		break;
	case OBS_SCALE_BILINEAR:
		scale_type_name = "Bilinear";
		break;
	case OBS_SCALE_LANCZOS:
		scale_type_name = "Lanczos";
		break;
	}

	blog(LOG_INFO, "---------------------------------");
	blog(LOG_INFO, "video settings reset:\n"
	               "\tbase resolution:   %dx%d\n"
	               "\toutput resolution: %dx%d\n"
	               "\tdownscale filter:  %s\n"
	               "\tfps:               %d/%d\n"
	               "\tformat:            %s",
	               ovi->base_width, ovi->base_height,
	               ovi->output_width, ovi->output_height,
	               scale_type_name,
	               ovi->fps_num, ovi->fps_den,
		       get_video_format_name(ovi->output_format));

	return obs_init_video(ovi);
}

bool obs_reset_audio(const struct obs_audio_info *oai)
{
	struct audio_output_info ai;

	if (!obs) return false;

	/* don't allow changing of audio settings if active. */
	if (obs->audio.audio && audio_output_active(obs->audio.audio))
		return false;

	obs_free_audio();
	if (!oai)
		return true;

	ai.name = "Audio";
	ai.samples_per_sec = oai->samples_per_sec;
	ai.format = AUDIO_FORMAT_FLOAT_PLANAR;
	ai.speakers = oai->speakers;
	ai.input_callback = audio_callback;

	blog(LOG_INFO, "---------------------------------");
	blog(LOG_INFO, "audio settings reset:\n"
	               "\tsamples per sec: %d\n"
	               "\tspeakers:        %d",
	               (int)ai.samples_per_sec,
	               (int)ai.speakers);

	return obs_init_audio(&ai);
}

bool obs_get_video_info(struct obs_video_info *ovi)
{
	struct obs_core_video *video = &obs->video;

	if (!obs || !video->graphics)
		return false;

	*ovi = video->ovi;
	return true;
}

bool obs_get_audio_info(struct obs_audio_info *oai)
{
	struct obs_core_audio *audio = &obs->audio;
	const struct audio_output_info *info;

	if (!obs || !oai || !audio->audio)
		return false;

	info = audio_output_get_info(audio->audio);

	oai->samples_per_sec = info->samples_per_sec;
	oai->speakers = info->speakers;
	return true;
}

bool obs_enum_source_types(size_t idx, const char **id)
{
	if (!obs) return false;

	if (idx >= obs->source_types.num)
		return false;
	*id = obs->source_types.array[idx].id;
	return true;
}

bool obs_enum_input_types(size_t idx, const char **id)
{
	if (!obs) return false;

	if (idx >= obs->input_types.num)
		return false;
	*id = obs->input_types.array[idx].id;
	return true;
}

bool obs_enum_filter_types(size_t idx, const char **id)
{
	if (!obs) return false;

	if (idx >= obs->filter_types.num)
		return false;
	*id = obs->filter_types.array[idx].id;
	return true;
}

bool obs_enum_transition_types(size_t idx, const char **id)
{
	if (!obs) return false;

	if (idx >= obs->transition_types.num)
		return false;
	*id = obs->transition_types.array[idx].id;
	return true;
}

bool obs_enum_output_types(size_t idx, const char **id)
{
	if (!obs) return false;

	if (idx >= obs->output_types.num)
		return false;
	*id = obs->output_types.array[idx].id;
	return true;
}

bool obs_enum_encoder_types(size_t idx, const char **id)
{
	if (!obs) return false;

	if (idx >= obs->encoder_types.num)
		return false;
	*id = obs->encoder_types.array[idx].id;
	return true;
}

bool obs_enum_service_types(size_t idx, const char **id)
{
	if (!obs) return false;

	if (idx >= obs->service_types.num)
		return false;
	*id = obs->service_types.array[idx].id;
	return true;
}

void obs_enter_graphics(void)
{
	if (obs && obs->video.graphics)
		gs_enter_context(obs->video.graphics);
}

void obs_leave_graphics(void)
{
	if (obs && obs->video.graphics)
		gs_leave_context();
}

audio_t *obs_get_audio(void)
{
	return (obs != NULL) ? obs->audio.audio : NULL;
}

video_t *obs_get_video(void)
{
	return (obs != NULL) ? obs->video.video : NULL;
}

/* TODO: optimize this later so it's not just O(N) string lookups */
static inline struct obs_modal_ui *get_modal_ui_callback(const char *id,
		const char *task, const char *target)
{
	for (size_t i = 0; i < obs->modal_ui_callbacks.num; i++) {
		struct obs_modal_ui *callback = obs->modal_ui_callbacks.array+i;

		if (strcmp(callback->id,     id)     == 0 &&
		    strcmp(callback->task,   task)   == 0 &&
		    strcmp(callback->target, target) == 0)
			return callback;
	}

	return NULL;
}

static inline struct obs_modeless_ui *get_modeless_ui_callback(const char *id,
		const char *task, const char *target)
{
	for (size_t i = 0; i < obs->modeless_ui_callbacks.num; i++) {
		struct obs_modeless_ui *callback;
		callback = obs->modeless_ui_callbacks.array+i;

		if (strcmp(callback->id,     id)     == 0 &&
		    strcmp(callback->task,   task)   == 0 &&
		    strcmp(callback->target, target) == 0)
			return callback;
	}

	return NULL;
}

int obs_exec_ui(const char *name, const char *task, const char *target,
		void *data, void *ui_data)
{
	struct obs_modal_ui *callback;
	int errorcode = OBS_UI_NOTFOUND;

	if (!obs) return errorcode;

	callback = get_modal_ui_callback(name, task, target);
	if (callback) {
		bool success = callback->exec(data, ui_data);
		errorcode = success ? OBS_UI_SUCCESS : OBS_UI_CANCEL;
	}

	return errorcode;
}

void *obs_create_ui(const char *name, const char *task, const char *target,
		void *data, void *ui_data)
{
	struct obs_modeless_ui *callback;

	if (!obs) return NULL;

	callback = get_modeless_ui_callback(name, task, target);
	return callback ? callback->create(data, ui_data) : NULL;
}

obs_source_t *obs_get_output_source(uint32_t channel)
{
	if (!obs) return NULL;
	return obs_view_get_source(&obs->data.main_view, channel);
}

void obs_set_output_source(uint32_t channel, obs_source_t *source)
{
	assert(channel < MAX_CHANNELS);

	if (!obs) return;
	if (channel >= MAX_CHANNELS) return;

	struct obs_source *prev_source;
	struct obs_view *view = &obs->data.main_view;
	struct calldata params = {0};

	pthread_mutex_lock(&view->channels_mutex);

	obs_source_addref(source);

	prev_source = view->channels[channel];

	calldata_set_int(&params, "channel", channel);
	calldata_set_ptr(&params, "prev_source", prev_source);
	calldata_set_ptr(&params, "source", source);
	signal_handler_signal(obs->signals, "channel_change", &params);
	calldata_get_ptr(&params, "source", &source);
	calldata_free(&params);

	view->channels[channel] = source;

	pthread_mutex_unlock(&view->channels_mutex);

	if (source)
		obs_source_activate(source, MAIN_VIEW);

	if (prev_source) {
		obs_source_deactivate(prev_source, MAIN_VIEW);
		obs_source_release(prev_source);
	}
}

void obs_enum_sources(bool (*enum_proc)(void*, obs_source_t*), void *param)
{
	obs_source_t *source;

	if (!obs) return;

	pthread_mutex_lock(&obs->data.sources_mutex);
	source = obs->data.first_source;

	while (source) {
		obs_source_t *next_source =
			(obs_source_t*)source->context.next;

		if ((source->info.type == OBS_SOURCE_TYPE_INPUT) != 0 &&
		    !source->context.private &&
		    !enum_proc(param, source))
			break;

		source = next_source;
	}

	pthread_mutex_unlock(&obs->data.sources_mutex);
}

static inline void obs_enum(void *pstart, pthread_mutex_t *mutex, void *proc,
		void *param)
{
	struct obs_context_data **start = pstart, *context;
	bool (*enum_proc)(void*, void*) = proc;

	assert(start);
	assert(mutex);
	assert(enum_proc);

	pthread_mutex_lock(mutex);

	context = *start;
	while (context) {
		if (!enum_proc(param, context))
			break;

		context = context->next;
	}

	pthread_mutex_unlock(mutex);
}

void obs_enum_outputs(bool (*enum_proc)(void*, obs_output_t*), void *param)
{
	if (!obs) return;
	obs_enum(&obs->data.first_output, &obs->data.outputs_mutex,
			enum_proc, param);
}

void obs_enum_encoders(bool (*enum_proc)(void*, obs_encoder_t*), void *param)
{
	if (!obs) return;
	obs_enum(&obs->data.first_encoder, &obs->data.encoders_mutex,
			enum_proc, param);
}

void obs_enum_services(bool (*enum_proc)(void*, obs_service_t*), void *param)
{
	if (!obs) return;
	obs_enum(&obs->data.first_service, &obs->data.services_mutex,
			enum_proc, param);
}

static inline void *get_context_by_name(void *vfirst, const char *name,
		pthread_mutex_t *mutex, void *(*addref)(void*))
{
	struct obs_context_data **first = vfirst;
	struct obs_context_data *context;

	pthread_mutex_lock(mutex);

	context = *first;
	while (context) {
		if (!context->private && strcmp(context->name, name) == 0) {
			context = addref(context);
			break;
		}
		context = context->next;
	}

	pthread_mutex_unlock(mutex);
	return context;
}

static inline void *obs_source_addref_safe_(void *ref)
{
	return obs_source_get_ref(ref);
}

static inline void *obs_output_addref_safe_(void *ref)
{
	return obs_output_get_ref(ref);
}

static inline void *obs_encoder_addref_safe_(void *ref)
{
	return obs_encoder_get_ref(ref);
}

static inline void *obs_service_addref_safe_(void *ref)
{
	return obs_service_get_ref(ref);
}

static inline void *obs_id_(void *data)
{
	return data;
}

obs_source_t *obs_get_source_by_name(const char *name)
{
	if (!obs) return NULL;
	return get_context_by_name(&obs->data.first_source, name,
			&obs->data.sources_mutex, obs_source_addref_safe_);
}

obs_output_t *obs_get_output_by_name(const char *name)
{
	if (!obs) return NULL;
	return get_context_by_name(&obs->data.first_output, name,
			&obs->data.outputs_mutex, obs_output_addref_safe_);
}

obs_encoder_t *obs_get_encoder_by_name(const char *name)
{
	if (!obs) return NULL;
	return get_context_by_name(&obs->data.first_encoder, name,
			&obs->data.encoders_mutex, obs_encoder_addref_safe_);
}

obs_service_t *obs_get_service_by_name(const char *name)
{
	if (!obs) return NULL;
	return get_context_by_name(&obs->data.first_service, name,
			&obs->data.services_mutex, obs_service_addref_safe_);
}

gs_effect_t *obs_get_base_effect(enum obs_base_effect effect)
{
	if (!obs) return NULL;

	switch (effect) {
	case OBS_EFFECT_DEFAULT:
		return obs->video.default_effect;
	case OBS_EFFECT_DEFAULT_RECT:
		return obs->video.default_rect_effect;
	case OBS_EFFECT_OPAQUE:
		return obs->video.opaque_effect;
	case OBS_EFFECT_SOLID:
		return obs->video.solid_effect;
	case OBS_EFFECT_BICUBIC:
		return obs->video.bicubic_effect;
	case OBS_EFFECT_LANCZOS:
		return obs->video.lanczos_effect;
	case OBS_EFFECT_BILINEAR_LOWRES:
		return obs->video.bilinear_lowres_effect;
	case OBS_EFFECT_PREMULTIPLIED_ALPHA:
		return obs->video.premultiplied_alpha_effect;
	}

	return NULL;
}

/* DEPRECATED */
gs_effect_t *obs_get_default_rect_effect(void)
{
	if (!obs) return NULL;
	return obs->video.default_rect_effect;
}

signal_handler_t *obs_get_signal_handler(void)
{
	if (!obs) return NULL;
	return obs->signals;
}

proc_handler_t *obs_get_proc_handler(void)
{
	if (!obs) return NULL;
	return obs->procs;
}

void obs_render_main_view(void)
{
	if (!obs) return;
	obs_view_render(&obs->data.main_view);
}

void obs_set_master_volume(float volume)
{
	struct calldata data = {0};

	if (!obs) return;

	calldata_set_float(&data, "volume", volume);
	signal_handler_signal(obs->signals, "master_volume", &data);
	volume = (float)calldata_float(&data, "volume");
	calldata_free(&data);

	obs->audio.user_volume = volume;
}

float obs_get_master_volume(void)
{
	return obs ? obs->audio.user_volume : 0.0f;
}

static obs_source_t *obs_load_source_type(obs_data_t *source_data)
{
	obs_data_array_t *filters = obs_data_get_array(source_data, "filters");
	obs_source_t *source;
	const char   *name    = obs_data_get_string(source_data, "name");
	const char   *id      = obs_data_get_string(source_data, "id");
	obs_data_t   *settings = obs_data_get_obj(source_data, "settings");
	obs_data_t   *hotkeys  = obs_data_get_obj(source_data, "hotkeys");
	double       volume;
	int64_t      sync;
	uint32_t     mixers;
	int          di_order;
	int          di_mode;
	int          monitoring_type;

	source = obs_source_create(id, name, settings, hotkeys);

	obs_data_release(hotkeys);

	obs_data_set_default_double(source_data, "volume", 1.0);
	volume = obs_data_get_double(source_data, "volume");
	obs_source_set_volume(source, (float)volume);

	sync = obs_data_get_int(source_data, "sync");
	obs_source_set_sync_offset(source, sync);

	obs_data_set_default_int(source_data, "mixers", 0xF);
	mixers = (uint32_t)obs_data_get_int(source_data, "mixers");
	obs_source_set_audio_mixers(source, mixers);

	obs_data_set_default_bool(source_data, "enabled", true);
	obs_source_set_enabled(source,
			obs_data_get_bool(source_data, "enabled"));

	obs_data_set_default_bool(source_data, "muted", false);
	obs_source_set_muted(source, obs_data_get_bool(source_data, "muted"));

	obs_data_set_default_bool(source_data, "push-to-mute", false);
	obs_source_enable_push_to_mute(source,
			obs_data_get_bool(source_data, "push-to-mute"));

	obs_data_set_default_int(source_data, "push-to-mute-delay", 0);
	obs_source_set_push_to_mute_delay(source,
			obs_data_get_int(source_data, "push-to-mute-delay"));

	obs_data_set_default_bool(source_data, "push-to-talk", false);
	obs_source_enable_push_to_talk(source,
			obs_data_get_bool(source_data, "push-to-talk"));

	obs_data_set_default_int(source_data, "push-to-talk-delay", 0);
	obs_source_set_push_to_talk_delay(source,
			obs_data_get_int(source_data, "push-to-talk-delay"));

	di_mode = (int)obs_data_get_int(source_data, "deinterlace_mode");
	obs_source_set_deinterlace_mode(source,
			(enum obs_deinterlace_mode)di_mode);

	di_order = (int)obs_data_get_int(source_data, "deinterlace_field_order");
	obs_source_set_deinterlace_field_order(source,
			(enum obs_deinterlace_field_order)di_order);

	monitoring_type = (int)obs_data_get_int(source_data, "monitoring_type");
	obs_source_set_monitoring_type(source,
			(enum obs_monitoring_type)monitoring_type);

	if (filters) {
		size_t count = obs_data_array_count(filters);

		for (size_t i = 0; i < count; i++) {
			obs_data_t *filter_data =
				obs_data_array_item(filters, i);

			obs_source_t *filter = obs_load_source_type(
					filter_data);
			if (filter) {
				obs_source_filter_add(source, filter);
				obs_source_release(filter);
			}

			obs_data_release(filter_data);
		}

		obs_data_array_release(filters);
	}

	obs_data_release(settings);

	return source;
}

obs_source_t *obs_load_source(obs_data_t *source_data)
{
	return obs_load_source_type(source_data);
}

void obs_load_sources(obs_data_array_t *array, obs_load_source_cb cb,
		void *private_data)
{
	if (!obs) return;

	struct obs_core_data *data = &obs->data;
	DARRAY(obs_source_t*) sources;
	size_t count;
	size_t i;

	da_init(sources);

	count = obs_data_array_count(array);
	da_reserve(sources, count);

	pthread_mutex_lock(&data->sources_mutex);

	for (i = 0; i < count; i++) {
		obs_data_t   *source_data = obs_data_array_item(array, i);
		obs_source_t *source      = obs_load_source(source_data);

		da_push_back(sources, &source);

		obs_data_release(source_data);
	}

	/* tell sources that we want to load */
	for (i = 0; i < sources.num; i++) {
		obs_source_t *source = sources.array[i];
		obs_data_t *source_data = obs_data_array_item(array, i);
		if (source) {
			if (source->info.type == OBS_SOURCE_TYPE_TRANSITION)
				obs_transition_load(source, source_data);
			obs_source_load(source);
			cb(private_data, source);
		}
		obs_data_release(source_data);
	}

	for (i = 0; i < sources.num; i++)
		obs_source_release(sources.array[i]);

	pthread_mutex_unlock(&data->sources_mutex);

	da_free(sources);
}

obs_data_t *obs_save_source(obs_source_t *source)
{
	obs_data_array_t *filters = obs_data_array_create();
	obs_data_t *source_data = obs_data_create();
	obs_data_t *settings    = obs_source_get_settings(source);
	obs_data_t *hotkey_data = source->context.hotkey_data;
	obs_data_t *hotkeys;
	float      volume      = obs_source_get_volume(source);
	uint32_t   mixers      = obs_source_get_audio_mixers(source);
	int64_t    sync        = obs_source_get_sync_offset(source);
	const char *name       = obs_source_get_name(source);
	const char *id         = obs_source_get_id(source);
	bool       enabled     = obs_source_enabled(source);
	bool       muted       = obs_source_muted(source);
	bool       push_to_mute= obs_source_push_to_mute_enabled(source);
	uint64_t   ptm_delay   = obs_source_get_push_to_mute_delay(source);
	bool       push_to_talk= obs_source_push_to_talk_enabled(source);
	uint64_t   ptt_delay   = obs_source_get_push_to_talk_delay(source);
	int        m_type      = (int)obs_source_get_monitoring_type(source);
	int        di_mode     = (int)obs_source_get_deinterlace_mode(source);
	int        di_order    =
		(int)obs_source_get_deinterlace_field_order(source);

	obs_source_save(source);
	hotkeys = obs_hotkeys_save_source(source);

	if (hotkeys) {
		obs_data_release(hotkey_data);
		source->context.hotkey_data = hotkeys;
		hotkey_data = hotkeys;
	}

	obs_data_set_string(source_data, "name",     name);
	obs_data_set_string(source_data, "id",       id);
	obs_data_set_obj   (source_data, "settings", settings);
	obs_data_set_int   (source_data, "mixers",   mixers);
	obs_data_set_int   (source_data, "sync",     sync);
	obs_data_set_double(source_data, "volume",   volume);
	obs_data_set_bool  (source_data, "enabled",  enabled);
	obs_data_set_bool  (source_data, "muted",    muted);
	obs_data_set_bool  (source_data, "push-to-mute", push_to_mute);
	obs_data_set_int   (source_data, "push-to-mute-delay", ptm_delay);
	obs_data_set_bool  (source_data, "push-to-talk", push_to_talk);
	obs_data_set_int   (source_data, "push-to-talk-delay", ptt_delay);
	obs_data_set_obj   (source_data, "hotkeys",  hotkey_data);
	obs_data_set_int   (source_data, "deinterlace_mode", di_mode);
	obs_data_set_int   (source_data, "deinterlace_field_order", di_order);
	obs_data_set_int   (source_data, "monitoring_type", m_type);

	if (source->info.type == OBS_SOURCE_TYPE_TRANSITION)
		obs_transition_save(source, source_data);

	pthread_mutex_lock(&source->filter_mutex);

	if (source->filters.num) {
		for (size_t i = source->filters.num; i > 0; i--) {
			obs_source_t *filter = source->filters.array[i - 1];
			obs_data_t *filter_data = obs_save_source(filter);
			obs_data_array_push_back(filters, filter_data);
			obs_data_release(filter_data);
		}

		obs_data_set_array(source_data, "filters", filters);
	}

	pthread_mutex_unlock(&source->filter_mutex);

	obs_data_release(settings);
	obs_data_array_release(filters);

	return source_data;
}

obs_data_array_t *obs_save_sources_filtered(obs_save_source_filter_cb cb,
		void *data_)
{
	if (!obs) return NULL;

	struct obs_core_data *data = &obs->data;
	obs_data_array_t *array;
	obs_source_t *source;

	array = obs_data_array_create();

	pthread_mutex_lock(&data->sources_mutex);

	source = data->first_source;

	while (source) {
		if ((source->info.type != OBS_SOURCE_TYPE_FILTER) != 0 &&
				!source->context.private && cb(data_, source)) {
			obs_data_t *source_data = obs_save_source(source);

			obs_data_array_push_back(array, source_data);
			obs_data_release(source_data);
		}

		source = (obs_source_t*)source->context.next;
	}

	pthread_mutex_unlock(&data->sources_mutex);

	return array;
}

static bool save_source_filter(void *data, obs_source_t *source)
{
	UNUSED_PARAMETER(data);
	UNUSED_PARAMETER(source);
	return true;
}

obs_data_array_t *obs_save_sources(void)
{
	return obs_save_sources_filtered(save_source_filter, NULL);
}

/* ensures that names are never blank */
static inline char *dup_name(const char *name, bool private)
{
	if (private && !name)
		return NULL;

	if (!name || !*name) {
		struct dstr unnamed = {0};
		dstr_printf(&unnamed, "__unnamed%04lld",
				obs->data.unnamed_index++);

		return unnamed.array;
	} else {
		return bstrdup(name);
	}
}

static inline bool obs_context_data_init_wrap(
		struct obs_context_data *context,
		enum obs_obj_type       type,
		obs_data_t              *settings,
		const char              *name,
		obs_data_t              *hotkey_data,
		bool                    private)
{
	assert(context);
	memset(context, 0, sizeof(*context));
	context->private = private;
	context->type = type;

	pthread_mutex_init_value(&context->rename_cache_mutex);
	if (pthread_mutex_init(&context->rename_cache_mutex, NULL) < 0)
		return false;

	context->signals = signal_handler_create();
	if (!context->signals)
		return false;

	context->procs = proc_handler_create();
	if (!context->procs)
		return false;

	context->name        = dup_name(name, private);
	context->settings    = obs_data_newref(settings);
	context->hotkey_data = obs_data_newref(hotkey_data);
	return true;
}

bool obs_context_data_init(
		struct obs_context_data *context,
		enum obs_obj_type       type,
		obs_data_t              *settings,
		const char              *name,
		obs_data_t              *hotkey_data,
		bool                    private)
{
	if (obs_context_data_init_wrap(context, type, settings, name,
				hotkey_data, private)) {
		return true;
	} else {
		obs_context_data_free(context);
		return false;
	}
}

void obs_context_data_free(struct obs_context_data *context)
{
	obs_hotkeys_context_release(context);
	signal_handler_destroy(context->signals);
	proc_handler_destroy(context->procs);
	obs_data_release(context->settings);
	obs_context_data_remove(context);
	pthread_mutex_destroy(&context->rename_cache_mutex);
	bfree(context->name);

	for (size_t i = 0; i < context->rename_cache.num; i++)
		bfree(context->rename_cache.array[i]);
	da_free(context->rename_cache);

	memset(context, 0, sizeof(*context));
}

void obs_context_data_insert(struct obs_context_data *context,
		pthread_mutex_t *mutex, void *pfirst)
{
	struct obs_context_data **first = pfirst;

	assert(context);
	assert(mutex);
	assert(first);

	context->mutex = mutex;

	pthread_mutex_lock(mutex);
	context->prev_next  = first;
	context->next       = *first;
	*first              = context;
	if (context->next)
		context->next->prev_next = &context->next;
	pthread_mutex_unlock(mutex);
}

void obs_context_data_remove(struct obs_context_data *context)
{
	if (context && context->mutex) {
		pthread_mutex_lock(context->mutex);
		if (context->prev_next)
			*context->prev_next = context->next;
		if (context->next)
			context->next->prev_next = context->prev_next;
		pthread_mutex_unlock(context->mutex);

		context->mutex = NULL;
	}
}

void obs_context_data_setname(struct obs_context_data *context,
		const char *name)
{
	pthread_mutex_lock(&context->rename_cache_mutex);

	if (context->name)
		da_push_back(context->rename_cache, &context->name);
	context->name = dup_name(name, context->private);

	pthread_mutex_unlock(&context->rename_cache_mutex);
}

profiler_name_store_t *obs_get_profiler_name_store(void)
{
	if (!obs)
		return NULL;

	return obs->name_store;
}

uint64_t obs_get_video_frame_time(void)
{
	return obs ? obs->video.video_time : 0;
}

double obs_get_active_fps(void)
{
	return obs ? obs->video.video_fps : 0.0;
}

uint64_t obs_get_average_frame_time_ns(void)
{
	return obs ? obs->video.video_avg_frame_time_ns : 0;
}

enum obs_obj_type obs_obj_get_type(void *obj)
{
	struct obs_context_data *context = obj;
	return context ? context->type : OBS_OBJ_TYPE_INVALID;
}

const char *obs_obj_get_id(void *obj)
{
	struct obs_context_data *context = obj;
	if (!context)
		return NULL;

	switch (context->type) {
	case OBS_OBJ_TYPE_SOURCE:  return ((obs_source_t*)obj)->info.id;
	case OBS_OBJ_TYPE_OUTPUT:  return ((obs_output_t*)obj)->info.id;
	case OBS_OBJ_TYPE_ENCODER: return ((obs_encoder_t*)obj)->info.id;
	case OBS_OBJ_TYPE_SERVICE: return ((obs_service_t*)obj)->info.id;
	default:;
	}

	return NULL;
}

bool obs_obj_invalid(void *obj)
{
	struct obs_context_data *context = obj;
	if (!context)
		return true;

	return !context->data;
}

bool obs_set_audio_monitoring_device(const char *name, const char *id)
{
	if (!obs || !name || !id || !*name || !*id)
		return false;

#ifdef _WIN32
	pthread_mutex_lock(&obs->audio.monitoring_mutex);

	if (strcmp(id, obs->audio.monitoring_device_id) == 0) {
		pthread_mutex_unlock(&obs->audio.monitoring_mutex);
		return true;
	}

	if (obs->audio.monitoring_device_name)
		bfree(obs->audio.monitoring_device_name);
	if (obs->audio.monitoring_device_id)
		bfree(obs->audio.monitoring_device_id);

	obs->audio.monitoring_device_name = bstrdup(name);
	obs->audio.monitoring_device_id = bstrdup(id);

	for (size_t i = 0; i < obs->audio.monitors.num; i++) {
		struct audio_monitor *monitor = obs->audio.monitors.array[i];
		audio_monitor_reset(monitor);
	}

	pthread_mutex_unlock(&obs->audio.monitoring_mutex);
	return true;
#else
	return false;
#endif
}

void obs_get_audio_monitoring_device(const char **name, const char **id)
{
	if (!obs)
		return;

	if (name)
		*name = obs->audio.monitoring_device_name;
	if (id)
		*id = obs->audio.monitoring_device_id;
}

void obs_add_main_render_callback(
		void (*draw)(void *param, uint32_t cx, uint32_t cy),
		void *param)
{
	if (!obs)
		return;

	struct draw_callback data = {draw, param};

	pthread_mutex_lock(&obs->data.draw_callbacks_mutex);
	da_push_back(obs->data.draw_callbacks, &data);
	pthread_mutex_unlock(&obs->data.draw_callbacks_mutex);
}

void obs_remove_main_render_callback(
		void (*draw)(void *param, uint32_t cx, uint32_t cy),
		void *param)
{
	if (!obs)
		return;

	struct draw_callback data = {draw, param};

	pthread_mutex_lock(&obs->data.draw_callbacks_mutex);
	da_erase_item(obs->data.draw_callbacks, &data);
	pthread_mutex_unlock(&obs->data.draw_callbacks_mutex);
}

uint32_t obs_get_total_frames(void)
{
	return obs ? obs->video.total_frames : 0;
}

uint32_t obs_get_lagged_frames(void)
{
	return obs ? obs->video.lagged_frames : 0;
}