obs-source.c

/******************************************************************************
    Copyright (C) 2013-2014 by Hugh Bailey <obs.jim@gmail.com>

    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 "media-io/format-conversion.h"
#include "media-io/video-frame.h"
#include "media-io/audio-io.h"
#include "util/threading.h"
#include "util/platform.h"
#include "callback/calldata.h"
#include "graphics/matrix3.h"
#include "graphics/vec3.h"

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

static inline bool source_valid(const struct obs_source *source)
{
	return source && source->context.data;
}

const struct obs_source_info *find_source(struct darray *list, const char *id)
{
	size_t i;
	struct obs_source_info *array = list->array;

	for (i = 0; i < list->num; i++) {
		struct obs_source_info *info = array+i;
		if (strcmp(info->id, id) == 0)
			return info;
	}

	return NULL;
}

static const struct obs_source_info *get_source_info(enum obs_source_type type,
		const char *id)
{
	struct darray *list = NULL;

	switch (type) {
	case OBS_SOURCE_TYPE_INPUT:
		list = &obs->input_types.da;
		break;

	case OBS_SOURCE_TYPE_FILTER:
		list = &obs->filter_types.da;
		break;

	case OBS_SOURCE_TYPE_TRANSITION:
		list = &obs->transition_types.da;
		break;
	}

	return find_source(list, id);
}

static const char *source_signals[] = {
	"void destroy(ptr source)",
	"void add(ptr source)",
	"void remove(ptr source)",
	"void activate(ptr source)",
	"void deactivate(ptr source)",
	"void show(ptr source)",
	"void hide(ptr source)",
	"void rename(ptr source, string new_name, string prev_name)",
	"void volume(ptr source, in out float volume)",
	"void update_properties(ptr source)",
	"void update_flags(ptr source, int flags)",
	"void audio_sync(ptr source, int out int offset)",
	"void audio_data(ptr source, ptr data)",
	"void audio_mixers(ptr source, in out int mixers)",
	"void filter_add(ptr source, ptr filter)",
	"void filter_remove(ptr source, ptr filter)",
	NULL
};

bool obs_source_init_context(struct obs_source *source,
		obs_data_t *settings, const char *name)
{
	if (!obs_context_data_init(&source->context, settings, name))
		return false;

	return signal_handler_add_array(source->context.signals,
			source_signals);
}

const char *obs_source_get_display_name(enum obs_source_type type,
		const char *id)
{
	const struct obs_source_info *info = get_source_info(type, id);
	return (info != NULL) ? info->get_name() : NULL;
}

/* internal initialization */
bool obs_source_init(struct obs_source *source,
		const struct obs_source_info *info)
{
	pthread_mutexattr_t attr;

	source->refs = 1;
	source->user_volume = 1.0f;
	source->present_volume = 1.0f;
	source->base_volume = 0.0f;
	source->sync_offset = 0;
	pthread_mutex_init_value(&source->filter_mutex);
	pthread_mutex_init_value(&source->async_mutex);
	pthread_mutex_init_value(&source->audio_mutex);

	if (pthread_mutexattr_init(&attr) != 0)
		return false;
	if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0)
		return false;
	if (pthread_mutex_init(&source->filter_mutex, &attr) != 0)
		return false;
	if (pthread_mutex_init(&source->audio_mutex, NULL) != 0)
		return false;
	if (pthread_mutex_init(&source->async_mutex, NULL) != 0)
		return false;

	if (info && info->output_flags & OBS_SOURCE_AUDIO) {
		source->audio_line = audio_output_create_line(obs->audio.audio,
				source->context.name, 0xF);
		if (!source->audio_line) {
			blog(LOG_ERROR, "Failed to create audio line for "
			                "source '%s'", source->context.name);
			return false;
		}
	}

	obs_context_data_insert(&source->context,
			&obs->data.sources_mutex,
			&obs->data.first_source);
	return true;
}

static inline void obs_source_dosignal(struct obs_source *source,
		const char *signal_obs, const char *signal_source)
{
	struct calldata data;

	calldata_init(&data);
	calldata_set_ptr(&data, "source", source);
	if (signal_obs)
		signal_handler_signal(obs->signals, signal_obs, &data);
	if (signal_source)
		signal_handler_signal(source->context.signals, signal_source,
				&data);
	calldata_free(&data);
}

obs_source_t *obs_source_create(enum obs_source_type type, const char *id,
		const char *name, obs_data_t *settings)
{
	struct obs_source *source = bzalloc(sizeof(struct obs_source));

	const struct obs_source_info *info = get_source_info(type, id);
	if (!info) {
		blog(LOG_ERROR, "Source ID '%s' not found", id);

		source->info.id      = bstrdup(id);
		source->info.type    = type;
		source->owns_info_id = true;
	} else {
		source->info = *info;
	}

	if (!obs_source_init_context(source, settings, name))
		goto fail;

	if (info && info->get_defaults)
		info->get_defaults(source->context.settings);

	/* allow the source to be created even if creation fails so that the
	 * user's data doesn't become lost */
	if (info)
		source->context.data = info->create(source->context.settings,
				source);
	if (!source->context.data)
		blog(LOG_ERROR, "Failed to create source '%s'!", name);

	if (!obs_source_init(source, info))
		goto fail;

	blog(LOG_INFO, "source '%s' (%s) created", name, id);
	obs_source_dosignal(source, "source_create", NULL);

	source->flags = source->default_flags;

	/* prevents the source from clearing the cache on the first frame */
	source->async_reset_texture = true;

	if (info && info->type == OBS_SOURCE_TYPE_TRANSITION)
		os_atomic_inc_long(&obs->data.active_transitions);
	return source;

fail:
	blog(LOG_ERROR, "obs_source_create failed");
	obs_source_destroy(source);
	return NULL;
}

void obs_source_frame_init(struct obs_source_frame *frame,
		enum video_format format, uint32_t width, uint32_t height)
{
	struct video_frame vid_frame;

	if (!frame)
		return;

	video_frame_init(&vid_frame, format, width, height);
	frame->format = format;
	frame->width  = width;
	frame->height = height;

	for (size_t i = 0; i < MAX_AV_PLANES; i++) {
		frame->data[i]     = vid_frame.data[i];
		frame->linesize[i] = vid_frame.linesize[i];
	}
}

static inline void obs_source_frame_decref(struct obs_source_frame *frame)
{
	if (os_atomic_dec_long(&frame->refs) == 0)
		obs_source_frame_destroy(frame);
}

void obs_source_destroy(struct obs_source *source)
{
	size_t i;

	if (!source)
		return;

	if (source->info.type == OBS_SOURCE_TYPE_TRANSITION)
		os_atomic_dec_long(&obs->data.active_transitions);

	obs_context_data_remove(&source->context);

	blog(LOG_INFO, "source '%s' destroyed", source->context.name);

	obs_source_dosignal(source, "source_destroy", "destroy");

	if (source->context.data) {
		source->info.destroy(source->context.data);
		source->context.data = NULL;
	}

	if (source->filter_parent)
		obs_source_filter_remove(source->filter_parent, source);

	while (source->filters.num)
		obs_source_filter_remove(source, source->filters.array[0]);

	for (i = 0; i < source->async_cache.num; i++)
		obs_source_frame_decref(source->async_cache.array[i].frame);

	gs_enter_context(obs->video.graphics);
	gs_texrender_destroy(source->async_convert_texrender);
	gs_texture_destroy(source->async_texture);
	gs_texrender_destroy(source->filter_texrender);
	gs_leave_context();

	for (i = 0; i < MAX_AV_PLANES; i++)
		bfree(source->audio_data.data[i]);

	audio_line_destroy(source->audio_line);
	audio_resampler_destroy(source->resampler);

	da_free(source->async_cache);
	da_free(source->async_frames);
	da_free(source->filters);
	pthread_mutex_destroy(&source->filter_mutex);
	pthread_mutex_destroy(&source->audio_mutex);
	pthread_mutex_destroy(&source->async_mutex);
	obs_context_data_free(&source->context);

	if (source->owns_info_id)
		bfree((void*)source->info.id);

	bfree(source);
}

void obs_source_addref(obs_source_t *source)
{
	if (source)
		os_atomic_inc_long(&source->refs);
}

void obs_source_release(obs_source_t *source)
{
	if (!source)
		return;

	if (os_atomic_dec_long(&source->refs) == 0)
		obs_source_destroy(source);
}

void obs_source_remove(obs_source_t *source)
{
	struct obs_core_data *data = &obs->data;
	size_t id;
	bool   exists;

	pthread_mutex_lock(&data->sources_mutex);

	if (!source || source->removed) {
		pthread_mutex_unlock(&data->sources_mutex);
		return;
	}

	source->removed = true;

	obs_source_addref(source);

	id = da_find(data->user_sources, &source, 0);
	exists = (id != DARRAY_INVALID);
	if (exists) {
		da_erase(data->user_sources, id);
		obs_source_release(source);
	}

	pthread_mutex_unlock(&data->sources_mutex);

	if (exists)
		obs_source_dosignal(source, "source_remove", "remove");

	obs_source_release(source);
}

bool obs_source_removed(const obs_source_t *source)
{
	return source ? source->removed : true;
}

static inline obs_data_t *get_defaults(const struct obs_source_info *info)
{
	obs_data_t *settings = obs_data_create();
	if (info->get_defaults)
		info->get_defaults(settings);
	return settings;
}

obs_data_t *obs_source_settings(enum obs_source_type type, const char *id)
{
	const struct obs_source_info *info = get_source_info(type, id);
	return (info) ? get_defaults(info) : NULL;
}

obs_properties_t *obs_get_source_properties(enum obs_source_type type,
		const char *id)
{
	const struct obs_source_info *info = get_source_info(type, id);
	if (info && info->get_properties) {
		obs_data_t       *defaults = get_defaults(info);
		obs_properties_t *properties;

		properties = info->get_properties(NULL);
		obs_properties_apply_settings(properties, defaults);
		obs_data_release(defaults);
		return properties;
	}
	return NULL;
}

obs_properties_t *obs_source_properties(const obs_source_t *source)
{
	if (source_valid(source) && source->info.get_properties) {
		obs_properties_t *props;
		props = source->info.get_properties(source->context.data);
		obs_properties_apply_settings(props, source->context.settings);
		return props;
	}

	return NULL;
}

uint32_t obs_source_get_output_flags(const obs_source_t *source)
{
	return source ? source->info.output_flags : 0;
}

static void obs_source_deferred_update(obs_source_t *source)
{
	if (source->context.data && source->info.update)
		source->info.update(source->context.data,
				source->context.settings);

	source->defer_update = false;
}

void obs_source_update(obs_source_t *source, obs_data_t *settings)
{
	if (!source) return;

	if (settings)
		obs_data_apply(source->context.settings, settings);

	if (source->info.output_flags & OBS_SOURCE_VIDEO) {
		source->defer_update = true;
	} else if (source->context.data && source->info.update) {
		source->info.update(source->context.data,
				source->context.settings);
	}
}

void obs_source_update_properties(obs_source_t *source)
{
	calldata_t calldata;

	if (!source) return;

	calldata_init(&calldata);
	calldata_set_ptr(&calldata, "source", source);

	signal_handler_signal(obs_source_get_signal_handler(source),
			"update_properties", &calldata);

	calldata_free(&calldata);
}

void obs_source_send_mouse_click(obs_source_t *source,
		const struct obs_mouse_event *event,
		int32_t type, bool mouse_up,
		uint32_t click_count)
{
	if (!source)
		return;

	if (source->info.output_flags & OBS_SOURCE_INTERACTION) {
		if (source->info.mouse_click) {
			source->info.mouse_click(source->context.data,
					event, type, mouse_up, click_count);
		}
	}
}

void obs_source_send_mouse_move(obs_source_t *source,
		const struct obs_mouse_event *event, bool mouse_leave)
{
	if (!source)
		return;

	if (source->info.output_flags & OBS_SOURCE_INTERACTION) {
		if (source->info.mouse_move) {
			source->info.mouse_move(source->context.data,
					event, mouse_leave);
		}
	}
}

void obs_source_send_mouse_wheel(obs_source_t *source,
		const struct obs_mouse_event *event, int x_delta, int y_delta)
{
	if (!source)
		return;

	if (source->info.output_flags & OBS_SOURCE_INTERACTION) {
		if (source->info.mouse_wheel) {
			source->info.mouse_wheel(source->context.data,
					event, x_delta, y_delta);
		}
	}
}

void obs_source_send_focus(obs_source_t *source, bool focus)
{
	if (!source)
		return;

	if (source->info.output_flags & OBS_SOURCE_INTERACTION) {
		if (source->info.focus) {
			source->info.focus(source->context.data, focus);
		}
	}
}

void obs_source_send_key_click(obs_source_t *source,
		const struct obs_key_event *event, bool key_up)
{
	if (!source)
		return;

	if (source->info.output_flags & OBS_SOURCE_INTERACTION) {
		if (source->info.key_click) {
			source->info.key_click(source->context.data, event,
					key_up);
		}
	}
}

static void activate_source(obs_source_t *source)
{
	if (source->context.data && source->info.activate)
		source->info.activate(source->context.data);
	obs_source_dosignal(source, "source_activate", "activate");
}

static void deactivate_source(obs_source_t *source)
{
	if (source->context.data && source->info.deactivate)
		source->info.deactivate(source->context.data);
	obs_source_dosignal(source, "source_deactivate", "deactivate");
}

static void show_source(obs_source_t *source)
{
	if (source->context.data && source->info.show)
		source->info.show(source->context.data);
	obs_source_dosignal(source, "source_show", "show");
}

static void hide_source(obs_source_t *source)
{
	if (source->context.data && source->info.hide)
		source->info.hide(source->context.data);
	obs_source_dosignal(source, "source_hide", "hide");
}

static void activate_tree(obs_source_t *parent, obs_source_t *child,
		void *param)
{
	os_atomic_inc_long(&child->activate_refs);

	UNUSED_PARAMETER(parent);
	UNUSED_PARAMETER(param);
}

static void deactivate_tree(obs_source_t *parent, obs_source_t *child,
		void *param)
{
	os_atomic_dec_long(&child->activate_refs);

	UNUSED_PARAMETER(parent);
	UNUSED_PARAMETER(param);
}

static void show_tree(obs_source_t *parent, obs_source_t *child, void *param)
{
	os_atomic_inc_long(&child->show_refs);

	UNUSED_PARAMETER(parent);
	UNUSED_PARAMETER(param);
}

static void hide_tree(obs_source_t *parent, obs_source_t *child, void *param)
{
	os_atomic_dec_long(&child->show_refs);

	UNUSED_PARAMETER(parent);
	UNUSED_PARAMETER(param);
}

void obs_source_activate(obs_source_t *source, enum view_type type)
{
	if (!source) return;

	if (os_atomic_inc_long(&source->show_refs) == 1) {
		obs_source_enum_tree(source, show_tree, NULL);
	}

	if (type == MAIN_VIEW) {
		if (os_atomic_inc_long(&source->activate_refs) == 1) {
			obs_source_enum_tree(source, activate_tree, NULL);
		}
	}
}

void obs_source_deactivate(obs_source_t *source, enum view_type type)
{
	if (!source) return;

	if (os_atomic_dec_long(&source->show_refs) == 0) {
		obs_source_enum_tree(source, hide_tree, NULL);
	}

	if (type == MAIN_VIEW) {
		if (os_atomic_dec_long(&source->activate_refs) == 0) {
			obs_source_enum_tree(source, deactivate_tree, NULL);
		}
	}
}

void obs_source_video_tick(obs_source_t *source, float seconds)
{
	bool now_showing, now_active;

	if (!source) return;

	if (source->defer_update)
		obs_source_deferred_update(source);

	/* reset the filter render texture information once every frame */
	if (source->filter_texrender)
		gs_texrender_reset(source->filter_texrender);

	/* call show/hide if the reference changed */
	now_showing = !!source->show_refs;
	if (now_showing != source->showing) {
		if (now_showing) {
			show_source(source);
		} else {
			hide_source(source);
		}

		source->showing = now_showing;
	}

	/* call activate/deactivate if the reference changed */
	now_active = !!source->activate_refs;
	if (now_active != source->active) {
		if (now_active) {
			activate_source(source);
		} else {
			deactivate_source(source);
		}

		source->active = now_active;
	}

	if (source->context.data && source->info.video_tick)
		source->info.video_tick(source->context.data, seconds);

	source->async_rendered = false;
}

/* unless the value is 3+ hours worth of frames, this won't overflow */
static inline uint64_t conv_frames_to_time(size_t frames)
{
	const struct audio_output_info *info;
	info = audio_output_get_info(obs->audio.audio);

	return (uint64_t)frames * 1000000000ULL /
		(uint64_t)info->samples_per_sec;
}

/* maximum timestamp variance in nanoseconds */
#define MAX_TS_VAR          2000000000ULL

static inline void reset_audio_timing(obs_source_t *source, uint64_t timestamp,
		uint64_t os_time)
{
	source->timing_set    = true;
	source->timing_adjust = os_time - timestamp;
}

static inline void handle_ts_jump(obs_source_t *source, uint64_t expected,
		uint64_t ts, uint64_t diff, uint64_t os_time)
{
	blog(LOG_DEBUG, "Timestamp for source '%s' jumped by '%"PRIu64"', "
	                "expected value %"PRIu64", input value %"PRIu64,
	                source->context.name, diff, expected, ts);

	/* if has video, ignore audio data until reset */
	if (!(source->info.output_flags & OBS_SOURCE_ASYNC))
		reset_audio_timing(source, ts, os_time);
}

static void source_signal_audio_data(obs_source_t *source,
		struct audio_data *in)
{
	struct calldata data;

	calldata_init(&data);

	calldata_set_ptr(&data, "source", source);
	calldata_set_ptr(&data, "data",   in);

	signal_handler_signal(source->context.signals, "audio_data", &data);

	calldata_free(&data);
}

static inline uint64_t uint64_diff(uint64_t ts1, uint64_t ts2)
{
	return (ts1 < ts2) ?  (ts2 - ts1) : (ts1 - ts2);
}

static void source_output_audio_line(obs_source_t *source,
		const struct audio_data *data)
{
	struct audio_data in = *data;
	uint64_t diff;
	uint64_t os_time = os_gettime_ns();

	/* detects 'directly' set timestamps as long as they're within
	 * a certain threshold */
	if (uint64_diff(in.timestamp, os_time) < MAX_TS_VAR) {
		source->timing_adjust = 0;
		source->timing_set = true;

	} else if (!source->timing_set) {
		reset_audio_timing(source, in.timestamp, os_time);

	} else if (source->next_audio_ts_min != 0) {
		diff = uint64_diff(source->next_audio_ts_min, in.timestamp);

		/* smooth audio if within threshold */
		if (diff > MAX_TS_VAR)
			handle_ts_jump(source, source->next_audio_ts_min,
					in.timestamp, diff, os_time);
		else if (diff < TS_SMOOTHING_THRESHOLD)
			in.timestamp = source->next_audio_ts_min;
	}

	source->next_audio_ts_min = in.timestamp +
		conv_frames_to_time(in.frames);

	in.timestamp += source->timing_adjust + source->sync_offset;
	in.volume = source->base_volume * source->user_volume *
		source->present_volume * obs->audio.user_volume *
		obs->audio.present_volume;

	audio_line_output(source->audio_line, &in);
	source_signal_audio_data(source, &in);
}

enum convert_type {
	CONVERT_NONE,
	CONVERT_NV12,
	CONVERT_420,
	CONVERT_422_U,
	CONVERT_422_Y,
};

static inline enum convert_type get_convert_type(enum video_format format)
{
	switch (format) {
	case VIDEO_FORMAT_I420:
		return CONVERT_420;
	case VIDEO_FORMAT_NV12:
		return CONVERT_NV12;

	case VIDEO_FORMAT_YVYU:
	case VIDEO_FORMAT_YUY2:
		return CONVERT_422_Y;
	case VIDEO_FORMAT_UYVY:
		return CONVERT_422_U;

	case VIDEO_FORMAT_NONE:
	case VIDEO_FORMAT_RGBA:
	case VIDEO_FORMAT_BGRA:
	case VIDEO_FORMAT_BGRX:
		return CONVERT_NONE;
	}

	return CONVERT_NONE;
}

static inline bool set_packed422_sizes(struct obs_source *source,
		const struct obs_source_frame *frame)
{
	source->async_convert_height = frame->height;
	source->async_convert_width  = frame->width / 2;
	source->async_texture_format = GS_BGRA;
	return true;
}

static inline bool set_planar420_sizes(struct obs_source *source,
		const struct obs_source_frame *frame)
{
	uint32_t size = frame->width * frame->height;
	size += size/2;

	source->async_convert_width   = frame->width;
	source->async_convert_height  = (size / frame->width + 1) & 0xFFFFFFFE;
	source->async_texture_format  = GS_R8;
	source->async_plane_offset[0] = (int)(frame->data[1] - frame->data[0]);
	source->async_plane_offset[1] = (int)(frame->data[2] - frame->data[0]);
	return true;
}

static inline bool set_nv12_sizes(struct obs_source *source,
		const struct obs_source_frame *frame)
{
	uint32_t size = frame->width * frame->height;
	size += size/2;

	source->async_convert_width   = frame->width;
	source->async_convert_height  = (size / frame->width + 1) & 0xFFFFFFFE;
	source->async_texture_format  = GS_R8;
	source->async_plane_offset[0] = (int)(frame->data[1] - frame->data[0]);
	return true;
}

static inline bool init_gpu_conversion(struct obs_source *source,
		const struct obs_source_frame *frame)
{
	switch (get_convert_type(frame->format)) {
		case CONVERT_422_Y:
		case CONVERT_422_U:
			return set_packed422_sizes(source, frame);

		case CONVERT_420:
			return set_planar420_sizes(source, frame);

		case CONVERT_NV12:
			return set_nv12_sizes(source, frame);
			break;

		case CONVERT_NONE:
			assert(false && "No conversion requested");
			break;

	}
	return false;
}

static inline enum gs_color_format convert_video_format(
		enum video_format format)
{
	if (format == VIDEO_FORMAT_RGBA)
		return GS_RGBA;
	else if (format == VIDEO_FORMAT_BGRA)
		return GS_BGRA;

	return GS_BGRX;
}

static inline bool set_async_texture_size(struct obs_source *source,
		const struct obs_source_frame *frame)
{
	enum convert_type cur = get_convert_type(frame->format);

	if (!source->async_reset_texture)
		return true;

	source->async_reset_texture = false;

	gs_texture_destroy(source->async_texture);
	gs_texrender_destroy(source->async_convert_texrender);
	source->async_convert_texrender = NULL;

	if (cur != CONVERT_NONE && init_gpu_conversion(source, frame)) {
		source->async_gpu_conversion = true;

		source->async_convert_texrender =
			gs_texrender_create(GS_BGRX, GS_ZS_NONE);

		source->async_texture = gs_texture_create(
				source->async_convert_width,
				source->async_convert_height,
				source->async_texture_format,
				1, NULL, GS_DYNAMIC);

	} else {
		enum gs_color_format format = convert_video_format(
				frame->format);
		source->async_gpu_conversion = false;

		source->async_texture = gs_texture_create(
				frame->width, frame->height,
				format, 1, NULL, GS_DYNAMIC);
	}

	return !!source->async_texture;
}

static void upload_raw_frame(gs_texture_t *tex,
		const struct obs_source_frame *frame)
{
	switch (get_convert_type(frame->format)) {
		case CONVERT_422_U:
		case CONVERT_422_Y:
			gs_texture_set_image(tex, frame->data[0],
					frame->linesize[0], false);
			break;

		case CONVERT_420:
			gs_texture_set_image(tex, frame->data[0],
					frame->width, false);
			break;

		case CONVERT_NV12:
			gs_texture_set_image(tex, frame->data[0],
					frame->width, false);
			break;

		case CONVERT_NONE:
			assert(false && "No conversion requested");
			break;
	}
}

static const char *select_conversion_technique(enum video_format format)
{
	switch (format) {
		case VIDEO_FORMAT_UYVY:
			return "UYVY_Reverse";

		case VIDEO_FORMAT_YUY2:
			return "YUY2_Reverse";

		case VIDEO_FORMAT_YVYU:
			return "YVYU_Reverse";

		case VIDEO_FORMAT_I420:
			return "I420_Reverse";

		case VIDEO_FORMAT_NV12:
			return "NV12_Reverse";
			break;

		case VIDEO_FORMAT_BGRA:
		case VIDEO_FORMAT_BGRX:
		case VIDEO_FORMAT_RGBA:
		case VIDEO_FORMAT_NONE:
			assert(false && "No conversion requested");
			break;
	}
	return NULL;
}

static inline void set_eparam(gs_effect_t *effect, const char *name, float val)
{
	gs_eparam_t *param = gs_effect_get_param_by_name(effect, name);
	gs_effect_set_float(param, val);
}

static bool update_async_texrender(struct obs_source *source,
		const struct obs_source_frame *frame)
{
	gs_texture_t   *tex       = source->async_texture;
	gs_texrender_t *texrender = source->async_convert_texrender;

	gs_texrender_reset(texrender);

	upload_raw_frame(tex, frame);

	uint32_t cx = source->async_width;
	uint32_t cy = source->async_height;

	float convert_width  = (float)source->async_convert_width;
	float convert_height = (float)source->async_convert_height;

	gs_effect_t *conv = obs->video.conversion_effect;
	gs_technique_t *tech = gs_effect_get_technique(conv,
			select_conversion_technique(frame->format));

	if (!gs_texrender_begin(texrender, cx, cy))
		return false;

	gs_technique_begin(tech);
	gs_technique_begin_pass(tech, 0);

	gs_effect_set_texture(gs_effect_get_param_by_name(conv, "image"), tex);
	set_eparam(conv, "width",  (float)cx);
	set_eparam(conv, "height", (float)cy);
	set_eparam(conv, "width_i",  1.0f / cx);
	set_eparam(conv, "height_i", 1.0f / cy);
	set_eparam(conv, "width_d2",  cx * 0.5f);
	set_eparam(conv, "height_d2", cy * 0.5f);
	set_eparam(conv, "width_d2_i",  1.0f / (cx * 0.5f));
	set_eparam(conv, "height_d2_i", 1.0f / (cy * 0.5f));
	set_eparam(conv, "input_width",  convert_width);
	set_eparam(conv, "input_height", convert_height);
	set_eparam(conv, "input_width_i",  1.0f / convert_width);
	set_eparam(conv, "input_height_i", 1.0f / convert_height);
	set_eparam(conv, "input_width_i_d2",  (1.0f / convert_width)  * 0.5f);
	set_eparam(conv, "input_height_i_d2", (1.0f / convert_height) * 0.5f);
	set_eparam(conv, "u_plane_offset",
			(float)source->async_plane_offset[0]);
	set_eparam(conv, "v_plane_offset",
			(float)source->async_plane_offset[1]);

	gs_ortho(0.f, (float)cx, 0.f, (float)cy, -100.f, 100.f);

	gs_draw_sprite(tex, 0, cx, cy);

	gs_technique_end_pass(tech);
	gs_technique_end(tech);

	gs_texrender_end(texrender);

	return true;
}

static bool update_async_texture(struct obs_source *source,
		const struct obs_source_frame *frame)
{
	gs_texture_t      *tex       = source->async_texture;
	gs_texrender_t    *texrender = source->async_convert_texrender;
	enum convert_type type      = get_convert_type(frame->format);
	uint8_t           *ptr;
	uint32_t          linesize;

	source->async_flip       = frame->flip;
	source->async_full_range = frame->full_range;
	memcpy(source->async_color_matrix, frame->color_matrix,
			sizeof(frame->color_matrix));
	memcpy(source->async_color_range_min, frame->color_range_min,
			sizeof frame->color_range_min);
	memcpy(source->async_color_range_max, frame->color_range_max,
			sizeof frame->color_range_max);

	if (source->async_gpu_conversion && texrender)
		return update_async_texrender(source, frame);

	if (type == CONVERT_NONE) {
		gs_texture_set_image(tex, frame->data[0], frame->linesize[0],
				false);
		return true;
	}

	if (!gs_texture_map(tex, &ptr, &linesize))
		return false;

	if (type == CONVERT_420)
		decompress_420((const uint8_t* const*)frame->data,
				frame->linesize,
				0, frame->height, ptr, linesize);

	else if (type == CONVERT_NV12)
		decompress_nv12((const uint8_t* const*)frame->data,
				frame->linesize,
				0, frame->height, ptr, linesize);

	else if (type == CONVERT_422_Y)
		decompress_422(frame->data[0], frame->linesize[0],
				0, frame->height, ptr, linesize, true);

	else if (type == CONVERT_422_U)
		decompress_422(frame->data[0], frame->linesize[0],
				0, frame->height, ptr, linesize, false);

	gs_texture_unmap(tex);
	return true;
}

static inline void obs_source_draw_texture(struct obs_source *source,
		gs_effect_t *effect, float *color_matrix,
		float const *color_range_min, float const *color_range_max)
{
	gs_texture_t *tex = source->async_texture;
	gs_eparam_t  *param;

	if (source->async_convert_texrender)
		tex = gs_texrender_get_texture(source->async_convert_texrender);

	if (color_range_min) {
		size_t const size = sizeof(float) * 3;
		param = gs_effect_get_param_by_name(effect, "color_range_min");
		gs_effect_set_val(param, color_range_min, size);
	}

	if (color_range_max) {
		size_t const size = sizeof(float) * 3;
		param = gs_effect_get_param_by_name(effect, "color_range_max");
		gs_effect_set_val(param, color_range_max, size);
	}

	if (color_matrix) {
		param = gs_effect_get_param_by_name(effect, "color_matrix");
		gs_effect_set_val(param, color_matrix, sizeof(float) * 16);
	}

	param = gs_effect_get_param_by_name(effect, "image");
	gs_effect_set_texture(param, tex);

	gs_draw_sprite(tex, source->async_flip ? GS_FLIP_V : 0, 0, 0);
}

static void obs_source_draw_async_texture(struct obs_source *source)
{
	gs_effect_t    *effect        = gs_get_effect();
	bool           yuv           = format_is_yuv(source->async_format);
	bool           limited_range = yuv && !source->async_full_range;
	const char     *type         = yuv ? "DrawMatrix" : "Draw";
	bool           def_draw      = (!effect);
	gs_technique_t *tech          = NULL;

	if (def_draw) {
		effect = obs_get_default_effect();
		tech = gs_effect_get_technique(effect, type);
		gs_technique_begin(tech);
		gs_technique_begin_pass(tech, 0);
	}

	obs_source_draw_texture(source, effect,
			yuv ? source->async_color_matrix : NULL,
			limited_range ? source->async_color_range_min : NULL,
			limited_range ? source->async_color_range_max : NULL);

	if (def_draw) {
		gs_technique_end_pass(tech);
		gs_technique_end(tech);
	}
}

static void obs_source_render_async_video(obs_source_t *source)
{
	if (!source->async_rendered) {
		struct obs_source_frame *frame = obs_source_get_frame(source);

		source->async_rendered = true;
		if (frame) {
			if (!set_async_texture_size(source, frame))
				return;
			if (!update_async_texture(source, frame))
				return;
		}

		obs_source_release_frame(source, frame);
	}

	if (source->async_texture && source->async_active)
		obs_source_draw_async_texture(source);
}

static inline void obs_source_render_filters(obs_source_t *source)
{
	source->rendering_filter = true;
	obs_source_video_render(source->filters.array[0]);
	source->rendering_filter = false;
}

static void obs_source_default_render(obs_source_t *source, bool color_matrix)
{
	gs_effect_t    *effect     = obs->video.default_effect;
	const char     *tech_name = color_matrix ? "DrawMatrix" : "Draw";
	gs_technique_t *tech       = gs_effect_get_technique(effect, tech_name);
	size_t         passes, i;

	passes = gs_technique_begin(tech);
	for (i = 0; i < passes; i++) {
		gs_technique_begin_pass(tech, i);
		if (source->context.data)
			source->info.video_render(source->context.data, effect);
		gs_technique_end_pass(tech);
	}
	gs_technique_end(tech);
}

static inline void obs_source_main_render(obs_source_t *source)
{
	uint32_t flags      = source->info.output_flags;
	bool color_matrix   = (flags & OBS_SOURCE_COLOR_MATRIX) != 0;
	bool custom_draw    = (flags & OBS_SOURCE_CUSTOM_DRAW) != 0;
	bool default_effect = !source->filter_parent &&
	                      source->filters.num == 0 &&
	                      !custom_draw;

	if (default_effect)
		obs_source_default_render(source, color_matrix);
	else if (source->context.data)
		source->info.video_render(source->context.data,
				custom_draw ? NULL : gs_get_effect());
}

void obs_source_video_render(obs_source_t *source)
{
	if (!source_valid(source)) return;

	if (source->filters.num && !source->rendering_filter)
		obs_source_render_filters(source);

	else if (source->info.video_render)
		obs_source_main_render(source);

	else if (source->filter_target)
		obs_source_video_render(source->filter_target);

	else
		obs_source_render_async_video(source);
}

static uint32_t get_base_width(const obs_source_t *source)
{
	if (source->info.get_width) {
		return source->info.get_width(source->context.data);

	} else if (source->info.type == OBS_SOURCE_TYPE_FILTER) {
		return get_base_width(source->filter_target);
	}

	return source->async_active ? source->async_width : 0;
}

static uint32_t get_base_height(const obs_source_t *source)
{
	if (source->info.get_height) {
		return source->info.get_height(source->context.data);

	} else if (source->info.type == OBS_SOURCE_TYPE_FILTER) {
		return get_base_height(source->filter_target);
	}

	return source->async_active ? source->async_height : 0;
}

static uint32_t get_recurse_width(obs_source_t *source)
{
	uint32_t width;

	pthread_mutex_lock(&source->filter_mutex);

	width = (source->filters.num) ?
		get_base_width(source->filters.array[0]) :
		get_base_width(source);

	pthread_mutex_unlock(&source->filter_mutex);

	return width;
}

static uint32_t get_recurse_height(obs_source_t *source)
{
	uint32_t height;

	pthread_mutex_lock(&source->filter_mutex);

	height = (source->filters.num) ?
		get_base_height(source->filters.array[0]) :
		get_base_height(source);

	pthread_mutex_unlock(&source->filter_mutex);

	return height;
}

uint32_t obs_source_get_width(obs_source_t *source)
{
	if (!source_valid(source)) return 0;

	return (source->info.type == OBS_SOURCE_TYPE_INPUT) ?
		get_recurse_width(source) :
	        get_base_width(source);
}

uint32_t obs_source_get_height(obs_source_t *source)
{
	if (!source_valid(source)) return 0;

	return (source->info.type == OBS_SOURCE_TYPE_INPUT) ?
		get_recurse_height(source) :
		get_base_height(source);
}

uint32_t obs_source_get_base_width(obs_source_t *source)
{
	if (!source_valid(source)) return 0;

	return get_base_width(source);
}

uint32_t obs_source_get_base_height(obs_source_t *source)
{
	if (!source_valid(source)) return 0;

	return get_base_height(source);
}

obs_source_t *obs_filter_get_parent(const obs_source_t *filter)
{
	return filter ? filter->filter_parent : NULL;
}

obs_source_t *obs_filter_get_target(const obs_source_t *filter)
{
	return filter ? filter->filter_target : NULL;
}

void obs_source_filter_add(obs_source_t *source, obs_source_t *filter)
{
	struct calldata cd = {0};

	if (!source || !filter)
		return;

	pthread_mutex_lock(&source->filter_mutex);

	if (da_find(source->filters, &filter, 0) != DARRAY_INVALID) {
		blog(LOG_WARNING, "Tried to add a filter that was already "
		                  "present on the source");
		return;
	}

	obs_source_addref(filter);

	if (source->filters.num) {
		obs_source_t **back = da_end(source->filters);
		(*back)->filter_target = filter;
	}

	filter->filter_parent = source;
	filter->filter_target = source;

	da_push_back(source->filters, &filter);

	pthread_mutex_unlock(&source->filter_mutex);

	calldata_set_ptr(&cd, "source", source);
	calldata_set_ptr(&cd, "filter", filter);

	signal_handler_signal(source->context.signals, "filter_add", &cd);

	calldata_free(&cd);
}

void obs_source_filter_remove(obs_source_t *source, obs_source_t *filter)
{
	struct calldata cd = {0};
	size_t idx;

	if (!source || !filter)
		return;

	pthread_mutex_lock(&source->filter_mutex);

	idx = da_find(source->filters, &filter, 0);
	if (idx == DARRAY_INVALID)
		return;

	if (idx > 0) {
		obs_source_t *prev = source->filters.array[idx-1];
		prev->filter_target = filter->filter_target;
	}

	da_erase(source->filters, idx);

	pthread_mutex_unlock(&source->filter_mutex);

	calldata_set_ptr(&cd, "source", source);
	calldata_set_ptr(&cd, "filter", filter);

	signal_handler_signal(source->context.signals, "filter_remove", &cd);

	calldata_free(&cd);

	if (filter->info.filter_remove)
		filter->info.filter_remove(filter->context.data,
				filter->filter_parent);

	filter->filter_parent = NULL;
	filter->filter_target = NULL;

	obs_source_release(filter);
}

void obs_source_filter_set_order(obs_source_t *source, obs_source_t *filter,
		enum obs_order_movement movement)
{
	size_t idx, i;

	if (!source || !filter)
		return;

	idx = da_find(source->filters, &filter, 0);
	if (idx == DARRAY_INVALID)
		return;

	if (movement == OBS_ORDER_MOVE_UP) {
		if (idx == source->filters.num-1)
			return;
		da_move_item(source->filters, idx, idx+1);

	} else if (movement == OBS_ORDER_MOVE_DOWN) {
		if (idx == 0)
			return;
		da_move_item(source->filters, idx, idx-1);

	} else if (movement == OBS_ORDER_MOVE_TOP) {
		if (idx == source->filters.num-1)
			return;
		da_move_item(source->filters, idx, source->filters.num-1);

	} else if (movement == OBS_ORDER_MOVE_BOTTOM) {
		if (idx == 0)
			return;
		da_move_item(source->filters, idx, 0);
	}

	/* reorder filter targets, not the nicest way of dealing with things */
	for (i = 0; i < source->filters.num; i++) {
		obs_source_t *next_filter = (i == source->filters.num-1) ?
			source : source->filters.array[idx+1];
		source->filters.array[i]->filter_target = next_filter;
	}
}

obs_data_t *obs_source_get_settings(const obs_source_t *source)
{
	if (!source) return NULL;

	obs_data_addref(source->context.settings);
	return source->context.settings;
}

static inline struct obs_source_frame *filter_async_video(obs_source_t *source,
		struct obs_source_frame *in)
{
	size_t i;
	for (i = source->filters.num; i > 0; i--) {
		struct obs_source *filter = source->filters.array[i-1];

		if (filter->context.data && filter->info.filter_video) {
			in = filter->info.filter_video(filter->context.data,
					in);
			if (!in)
				return NULL;
		}
	}

	return in;
}

static inline void copy_frame_data_line(struct obs_source_frame *dst,
		const struct obs_source_frame *src, uint32_t plane, uint32_t y)
{
	uint32_t pos_src = y * src->linesize[plane];
	uint32_t pos_dst = y * dst->linesize[plane];
	uint32_t bytes = dst->linesize[plane] < src->linesize[plane] ?
		dst->linesize[plane] : src->linesize[plane];

	memcpy(dst->data[plane] + pos_dst, src->data[plane] + pos_src, bytes);
}

static inline void copy_frame_data_plane(struct obs_source_frame *dst,
		const struct obs_source_frame *src,
		uint32_t plane, uint32_t lines)
{
	if (dst->linesize[plane] != src->linesize[plane])
		for (uint32_t y = 0; y < lines; y++)
			copy_frame_data_line(dst, src, plane, y);
	else
		memcpy(dst->data[plane], src->data[plane],
				dst->linesize[plane] * lines);
}

static void copy_frame_data(struct obs_source_frame *dst,
		const struct obs_source_frame *src)
{
	dst->flip         = src->flip;
	dst->full_range   = src->full_range;
	dst->timestamp    = src->timestamp;
	memcpy(dst->color_matrix, src->color_matrix, sizeof(float) * 16);
	if (!dst->full_range) {
		size_t const size = sizeof(float) * 3;
		memcpy(dst->color_range_min, src->color_range_min, size);
		memcpy(dst->color_range_max, src->color_range_max, size);
	}

	switch (dst->format) {
	case VIDEO_FORMAT_I420:
		copy_frame_data_plane(dst, src, 0, dst->height);
		copy_frame_data_plane(dst, src, 1, dst->height/2);
		copy_frame_data_plane(dst, src, 2, dst->height/2);
		break;

	case VIDEO_FORMAT_NV12:
		copy_frame_data_plane(dst, src, 0, dst->height);
		copy_frame_data_plane(dst, src, 1, dst->height/2);
		break;

	case VIDEO_FORMAT_YVYU:
	case VIDEO_FORMAT_YUY2:
	case VIDEO_FORMAT_UYVY:
	case VIDEO_FORMAT_NONE:
	case VIDEO_FORMAT_RGBA:
	case VIDEO_FORMAT_BGRA:
	case VIDEO_FORMAT_BGRX:
		copy_frame_data_plane(dst, src, 0, dst->height);
	}
}

static inline bool async_texture_changed(struct obs_source *source,
		const struct obs_source_frame *frame)
{
	enum convert_type prev, cur;
	prev = get_convert_type(source->async_format);
	cur  = get_convert_type(frame->format);

	return source->async_width  != frame->width ||
	       source->async_height != frame->height ||
	       prev != cur;
}

static inline void free_async_cache(struct obs_source *source)
{
	for (size_t i = 0; i < source->async_cache.num; i++)
		obs_source_frame_decref(source->async_cache.array[i].frame);

	da_resize(source->async_cache, 0);
	da_resize(source->async_frames, 0);
}

static inline struct obs_source_frame *cache_video(struct obs_source *source,
		const struct obs_source_frame *frame)
{
	struct obs_source_frame *new_frame = NULL;

	pthread_mutex_lock(&source->async_mutex);

	if (async_texture_changed(source, frame)) {
		/* prevents the cache from being freed on the first frame */
		if (!source->async_reset_texture)
			free_async_cache(source);

		source->async_width         = frame->width;
		source->async_height        = frame->height;
		source->async_format        = frame->format;
		source->async_reset_texture = true;
	}

	for (size_t i = 0; i < source->async_cache.num; i++) {
		struct async_frame *af = &source->async_cache.array[i];
		if (!af->used) {
			new_frame = af->frame;
			af->used = true;
			break;
		}
	}

	if (!new_frame) {
		struct async_frame new_af;

		new_frame = obs_source_frame_create(frame->format,
				frame->width, frame->height);
		new_af.frame = new_frame;
		new_af.used = true;
		new_frame->refs = 1;

		da_push_back(source->async_cache, &new_af);
	}

	pthread_mutex_unlock(&source->async_mutex);

	copy_frame_data(new_frame, frame);
	return new_frame;
}

static bool ready_async_frame(obs_source_t *source, uint64_t sys_time);

static inline void cycle_frames(struct obs_source *source)
{
	if (source->async_frames.num && !source->activate_refs)
		ready_async_frame(source, os_gettime_ns());
}

void obs_source_output_video(obs_source_t *source,
		const struct obs_source_frame *frame)
{
	if (!source)
		return;

	struct obs_source_frame *output = !!frame ?
		cache_video(source, frame) : NULL;

	pthread_mutex_lock(&source->filter_mutex);

	if (output)
		os_atomic_inc_long(&output->refs);

	output = filter_async_video(source, output);

	if (output && os_atomic_dec_long(&output->refs) == 0) {
		obs_source_frame_destroy(output);
		output = NULL;
	}

	pthread_mutex_unlock(&source->filter_mutex);

	/* ------------------------------------------- */

	if (output) {
		pthread_mutex_lock(&source->async_mutex);
		cycle_frames(source);
		da_push_back(source->async_frames, &output);
		pthread_mutex_unlock(&source->async_mutex);
		source->async_active = true;
	} else {
		source->async_active = false;
	}
}

static inline struct obs_audio_data *filter_async_audio(obs_source_t *source,
		struct obs_audio_data *in)
{
	size_t i;
	for (i = source->filters.num; i > 0; i--) {
		struct obs_source *filter = source->filters.array[i-1];

		if (filter->context.data && filter->info.filter_audio) {
			in = filter->info.filter_audio(filter->context.data,
					in);
			if (!in)
				return NULL;
		}
	}

	return in;
}

static inline void reset_resampler(obs_source_t *source,
		const struct obs_source_audio *audio)
{
	const struct audio_output_info *obs_info;
	struct resample_info output_info;

	obs_info = audio_output_get_info(obs->audio.audio);

	output_info.format           = obs_info->format;
	output_info.samples_per_sec  = obs_info->samples_per_sec;
	output_info.speakers         = obs_info->speakers;

	source->sample_info.format          = audio->format;
	source->sample_info.samples_per_sec = audio->samples_per_sec;
	source->sample_info.speakers        = audio->speakers;

	audio_resampler_destroy(source->resampler);
	source->resampler = NULL;

	if (source->sample_info.samples_per_sec == obs_info->samples_per_sec &&
	    source->sample_info.format          == obs_info->format          &&
	    source->sample_info.speakers        == obs_info->speakers) {
		source->audio_failed = false;
		return;
	}

	source->resampler = audio_resampler_create(&output_info,
			&source->sample_info);

	source->audio_failed = source->resampler == NULL;
	if (source->resampler == NULL)
		blog(LOG_ERROR, "creation of resampler failed");
}

static void copy_audio_data(obs_source_t *source,
		const uint8_t *const data[], uint32_t frames, uint64_t ts)
{
	size_t planes    = audio_output_get_planes(obs->audio.audio);
	size_t blocksize = audio_output_get_block_size(obs->audio.audio);
	size_t size      = (size_t)frames * blocksize;
	bool   resize    = source->audio_storage_size < size;

	source->audio_data.frames    = frames;
	source->audio_data.timestamp = ts;

	for (size_t i = 0; i < planes; i++) {
		/* ensure audio storage capacity */
		if (resize) {
			bfree(source->audio_data.data[i]);
			source->audio_data.data[i] = bmalloc(size);
		}

		memcpy(source->audio_data.data[i], data[i], size);
	}

	if (resize)
		source->audio_storage_size = size;
}

/* TODO: SSE optimization */
static void downmix_to_mono_planar(struct obs_source *source, uint32_t frames)
{
	size_t channels = audio_output_get_channels(obs->audio.audio);
	const float channels_i = 1.0f / (float)channels;
	float **data = (float**)source->audio_data.data;

	for (size_t channel = 1; channel < channels; channel++) {
		for (uint32_t frame = 0; frame < frames; frame++)
			data[0][frame] += data[channel][frame];
	}

	for (uint32_t frame = 0; frame < frames; frame++)
		data[0][frame] *= channels_i;

	for (size_t channel = 1; channel < channels; channel++) {
		for (uint32_t frame = 0; frame < frames; frame++)
			data[channel][frame] = data[0][frame];
	}
}

/* resamples/remixes new audio to the designated main audio output format */
static void process_audio(obs_source_t *source,
		const struct obs_source_audio *audio)
{
	uint32_t frames = audio->frames;
	bool mono_output;

	if (source->sample_info.samples_per_sec != audio->samples_per_sec ||
	    source->sample_info.format          != audio->format          ||
	    source->sample_info.speakers        != audio->speakers)
		reset_resampler(source, audio);

	if (source->audio_failed)
		return;

	if (source->resampler) {
		uint8_t  *output[MAX_AV_PLANES];
		uint64_t offset;

		memset(output, 0, sizeof(output));

		audio_resampler_resample(source->resampler,
				output, &frames, &offset,
				audio->data, audio->frames);

		copy_audio_data(source, (const uint8_t *const *)output, frames,
				audio->timestamp - offset);
	} else {
		copy_audio_data(source, audio->data, audio->frames,
				audio->timestamp);
	}

	mono_output = audio_output_get_channels(obs->audio.audio) == 1;

	if (!mono_output && (source->flags & OBS_SOURCE_FLAG_FORCE_MONO) != 0)
		downmix_to_mono_planar(source, frames);
}

void obs_source_output_audio(obs_source_t *source,
		const struct obs_source_audio *audio)
{
	uint32_t flags;
	struct obs_audio_data *output;

	if (!source || !audio)
		return;

	flags = source->info.output_flags;
	process_audio(source, audio);

	pthread_mutex_lock(&source->filter_mutex);
	output = filter_async_audio(source, &source->audio_data);

	if (output) {
		struct audio_data data;

		for (int i = 0; i < MAX_AV_PLANES; i++)
			data.data[i] = output->data[i];

		data.frames    = output->frames;
		data.timestamp = output->timestamp;

		pthread_mutex_lock(&source->audio_mutex);
		source_output_audio_line(source, &data);
		pthread_mutex_unlock(&source->audio_mutex);
	}

	pthread_mutex_unlock(&source->filter_mutex);
}

static inline bool frame_out_of_bounds(const obs_source_t *source, uint64_t ts)
{
	if (ts < source->last_frame_ts)
		return ((source->last_frame_ts - ts) > MAX_TS_VAR);
	else
		return ((ts - source->last_frame_ts) > MAX_TS_VAR);
}

static void remove_async_frame(obs_source_t *source,
		struct obs_source_frame *frame)
{
	for (size_t i = 0; i < source->async_cache.num; i++) {
		struct async_frame *f = &source->async_cache.array[i];

		if (f->frame == frame) {
			f->used = false;
			break;
		}
	}
}

/* #define DEBUG_ASYNC_FRAMES 1 */

static bool ready_async_frame(obs_source_t *source, uint64_t sys_time)
{
	struct obs_source_frame *next_frame = source->async_frames.array[0];
	struct obs_source_frame *frame      = NULL;
	uint64_t sys_offset = sys_time - source->last_sys_timestamp;
	uint64_t frame_time = next_frame->timestamp;
	uint64_t frame_offset = 0;

	if ((source->flags & OBS_SOURCE_FLAG_UNBUFFERED) != 0) {
		while (source->async_frames.num > 1) {
			da_erase(source->async_frames, 0);
			remove_async_frame(source, next_frame);
			next_frame = source->async_frames.array[0];
		}

		return true;
	}

#if DEBUG_ASYNC_FRAMES
	blog(LOG_DEBUG, "source->last_frame_ts: %llu, frame_time: %llu, "
			"sys_offset: %llu, frame_offset: %llu, "
			"number of frames: %lu",
			source->last_frame_ts, frame_time, sys_offset,
			frame_time - source->last_frame_ts,
			(unsigned long)source->async_frames.num);
#endif

	/* account for timestamp invalidation */
	if (frame_out_of_bounds(source, frame_time)) {
#if DEBUG_ASYNC_FRAMES
		blog(LOG_DEBUG, "timing jump");
#endif
		source->last_frame_ts = next_frame->timestamp;
		return true;
	} else {
		frame_offset = frame_time - source->last_frame_ts;
		source->last_frame_ts += sys_offset;
	}

	while (source->last_frame_ts > next_frame->timestamp) {

		/* this tries to reduce the needless frame duplication, also
		 * helps smooth out async rendering to frame boundaries.  In
		 * other words, tries to keep the framerate as smooth as
		 * possible */
		if ((source->last_frame_ts - next_frame->timestamp) < 1000000)
			break;

		if (frame)
			da_erase(source->async_frames, 0);

#if DEBUG_ASYNC_FRAMES
		blog(LOG_DEBUG, "new frame, "
				"source->last_frame_ts: %llu, "
				"next_frame->timestamp: %llu",
				source->last_frame_ts,
				next_frame->timestamp);
#endif

		remove_async_frame(source, frame);

		if (source->async_frames.num == 1)
			return true;

		frame = next_frame;
		next_frame = source->async_frames.array[1];

		/* more timestamp checking and compensating */
		if ((next_frame->timestamp - frame_time) > MAX_TS_VAR) {
#if DEBUG_ASYNC_FRAMES
			blog(LOG_DEBUG, "timing jump");
#endif
			source->last_frame_ts =
				next_frame->timestamp - frame_offset;
		}

		frame_time   = next_frame->timestamp;
		frame_offset = frame_time - source->last_frame_ts;
	}

#if DEBUG_ASYNC_FRAMES
	if (!frame)
		blog(LOG_DEBUG, "no frame!");
#endif

	return frame != NULL;
}

static inline struct obs_source_frame *get_closest_frame(obs_source_t *source,
		uint64_t sys_time)
{
	if (ready_async_frame(source, sys_time)) {
		struct obs_source_frame *frame = source->async_frames.array[0];
		da_erase(source->async_frames, 0);
		return frame;
	}

	return NULL;
}

/*
 * Ensures that cached frames are displayed on time.  If multiple frames
 * were cached between renders, then releases the unnecessary frames and uses
 * the frame with the closest timing to ensure sync.  Also ensures that timing
 * with audio is synchronized.
 */
struct obs_source_frame *obs_source_get_frame(obs_source_t *source)
{
	struct obs_source_frame *frame = NULL;
	uint64_t sys_time;

	if (!source)
		return NULL;

	pthread_mutex_lock(&source->async_mutex);

	sys_time = os_gettime_ns();

	if (!source->async_frames.num)
		goto unlock;

	if (!source->last_frame_ts) {
		frame = source->async_frames.array[0];
		da_erase(source->async_frames, 0);

		source->last_frame_ts = frame->timestamp;
	} else {
		frame = get_closest_frame(source, sys_time);
	}

	/* reset timing to current system time */
	if (frame) {
		source->timing_adjust = sys_time - frame->timestamp;
		source->timing_set = true;

		os_atomic_inc_long(&frame->refs);
	}

unlock:
	source->last_sys_timestamp = sys_time;

	pthread_mutex_unlock(&source->async_mutex);

	return frame;
}

void obs_source_release_frame(obs_source_t *source,
		struct obs_source_frame *frame)
{
	if (!frame)
		return;

	if (!source) {
		obs_source_frame_destroy(frame);
	} else {
		pthread_mutex_lock(&source->async_mutex);

		if (os_atomic_dec_long(&frame->refs) == 0)
			obs_source_frame_destroy(frame);
		else
			remove_async_frame(source, frame);

		pthread_mutex_unlock(&source->async_mutex);
	}
}

const char *obs_source_get_name(const obs_source_t *source)
{
	return source ? source->context.name : NULL;
}

void obs_source_set_name(obs_source_t *source, const char *name)
{
	if (!source) return;

	if (!name || !*name || strcmp(name, source->context.name) != 0) {
		struct calldata data;
		char *prev_name = bstrdup(source->context.name);
		obs_context_data_setname(&source->context, name);

		calldata_init(&data);
		calldata_set_ptr(&data, "source", source);
		calldata_set_string(&data, "new_name", source->context.name);
		calldata_set_string(&data, "prev_name", prev_name);
		signal_handler_signal(obs->signals, "source_rename", &data);
		signal_handler_signal(source->context.signals, "rename", &data);
		calldata_free(&data);
		bfree(prev_name);
	}
}

enum obs_source_type obs_source_get_type(const obs_source_t *source)
{
	return source ? source->info.type : OBS_SOURCE_TYPE_INPUT;
}

const char *obs_source_get_id(const obs_source_t *source)
{
	return source ? source->info.id : NULL;
}

static inline void render_filter_bypass(obs_source_t *target,
		gs_effect_t *effect, bool use_matrix)
{
	const char  *tech_name = use_matrix ? "DrawMatrix" : "Draw";
	gs_technique_t *tech    = gs_effect_get_technique(effect, tech_name);
	size_t      passes, i;

	passes = gs_technique_begin(tech);
	for (i = 0; i < passes; i++) {
		gs_technique_begin_pass(tech, i);
		obs_source_video_render(target);
		gs_technique_end_pass(tech);
	}
	gs_technique_end(tech);
}

static inline void render_filter_tex(gs_texture_t *tex, gs_effect_t *effect,
		uint32_t width, uint32_t height, bool use_matrix)
{
	const char  *tech_name = use_matrix ? "DrawMatrix" : "Draw";
	gs_technique_t *tech    = gs_effect_get_technique(effect, tech_name);
	gs_eparam_t    *image   = gs_effect_get_param_by_name(effect, "image");
	size_t      passes, i;

	gs_effect_set_texture(image, tex);

	passes = gs_technique_begin(tech);
	for (i = 0; i < passes; i++) {
		gs_technique_begin_pass(tech, i);
		gs_draw_sprite(tex, 0, width, height);
		gs_technique_end_pass(tech);
	}
	gs_technique_end(tech);
}

static inline bool can_bypass(obs_source_t *target, obs_source_t *parent,
		uint32_t parent_flags,
		enum obs_allow_direct_render allow_direct)
{
	return (target == parent) &&
		(allow_direct == OBS_ALLOW_DIRECT_RENDERING) &&
		((parent_flags & OBS_SOURCE_CUSTOM_DRAW) == 0) &&
		((parent_flags & OBS_SOURCE_ASYNC) == 0);
}

void obs_source_process_filter_begin(obs_source_t *filter,
		enum gs_color_format format,
		enum obs_allow_direct_render allow_direct)
{
	obs_source_t *target, *parent;
	uint32_t     target_flags, parent_flags;
	int          cx, cy;
	bool         use_matrix;

	if (!filter) return;

	target       = obs_filter_get_target(filter);
	parent       = obs_filter_get_parent(filter);
	target_flags = target->info.output_flags;
	parent_flags = parent->info.output_flags;
	cx           = get_base_width(target);
	cy           = get_base_height(target);
	use_matrix   = !!(target_flags & OBS_SOURCE_COLOR_MATRIX);

	filter->allow_direct = allow_direct;

	/* if the parent does not use any custom effects, and this is the last
	 * filter in the chain for the parent, then render the parent directly
	 * using the filter effect instead of rendering to texture to reduce
	 * the total number of passes */
	if (can_bypass(target, parent, parent_flags, allow_direct)) {
		return;
	}

	if (!filter->filter_texrender)
		filter->filter_texrender = gs_texrender_create(format,
				GS_ZS_NONE);

	gs_blend_state_push();
	gs_blend_function(GS_BLEND_ONE, GS_BLEND_ZERO);

	if (gs_texrender_begin(filter->filter_texrender, cx, cy)) {
		bool custom_draw = (parent_flags & OBS_SOURCE_CUSTOM_DRAW) != 0;
		bool async = (parent_flags & OBS_SOURCE_ASYNC) != 0;
		struct vec4 clear_color;

		vec4_zero(&clear_color);
		gs_clear(GS_CLEAR_COLOR, &clear_color, 0.0f, 0);
		gs_ortho(0.0f, (float)cx, 0.0f, (float)cy, -100.0f, 100.0f);

		if (target == parent && !custom_draw && !async)
			obs_source_default_render(target, use_matrix);
		else
			obs_source_video_render(target);

		gs_texrender_end(filter->filter_texrender);
	}

	gs_blend_state_pop();
}

void obs_source_process_filter_end(obs_source_t *filter, gs_effect_t *effect,
		uint32_t width, uint32_t height)
{
	obs_source_t *target, *parent;
	gs_texture_t *texture;
	uint32_t     target_flags, parent_flags;
	bool         use_matrix;

	if (!filter) return;

	target       = obs_filter_get_target(filter);
	parent       = obs_filter_get_parent(filter);
	target_flags = target->info.output_flags;
	parent_flags = parent->info.output_flags;
	use_matrix   = !!(target_flags & OBS_SOURCE_COLOR_MATRIX);

	if (can_bypass(target, parent, parent_flags, filter->allow_direct)) {
		render_filter_bypass(target, effect, use_matrix);
	} else {
		texture = gs_texrender_get_texture(filter->filter_texrender);
		render_filter_tex(texture, effect, width, height, use_matrix);
	}
}

void obs_source_skip_video_filter(obs_source_t *filter)
{
	obs_source_t *target, *parent;
	bool custom_draw, async;
	uint32_t parent_flags;
	bool use_matrix;

	if (!filter) return;

	target = obs_filter_get_target(filter);
	parent = obs_filter_get_parent(filter);
	parent_flags = parent->info.output_flags;
	custom_draw = (parent_flags & OBS_SOURCE_CUSTOM_DRAW) != 0;
	async = (parent_flags & OBS_SOURCE_ASYNC) != 0;
	use_matrix = !!(parent_flags & OBS_SOURCE_COLOR_MATRIX);

	if (target == parent && !custom_draw && !async)
		obs_source_default_render(target, use_matrix);
	else if (target->info.video_render)
		obs_source_main_render(target);
	else if (target->filter_target)
		obs_source_video_render(target->filter_target);
	else
		obs_source_render_async_video(target);
}

signal_handler_t *obs_source_get_signal_handler(const obs_source_t *source)
{
	return source ? source->context.signals : NULL;
}

proc_handler_t *obs_source_get_proc_handler(const obs_source_t *source)
{
	return source ? source->context.procs : NULL;
}

void obs_source_set_volume(obs_source_t *source, float volume)
{
	if (source) {
		struct calldata data = {0};
		calldata_set_ptr(&data, "source", source);
		calldata_set_float(&data, "volume", volume);

		signal_handler_signal(source->context.signals, "volume", &data);
		signal_handler_signal(obs->signals, "source_volume", &data);

		volume = (float)calldata_float(&data, "volume");
		calldata_free(&data);

		source->user_volume = volume;
	}
}

static void set_tree_preset_vol(obs_source_t *parent, obs_source_t *child,
		void *param)
{
	float *vol = param;
	child->present_volume = *vol;

	UNUSED_PARAMETER(parent);
}

void obs_source_set_present_volume(obs_source_t *source, float volume)
{
	if (source)
		source->present_volume = volume;
}

float obs_source_get_volume(const obs_source_t *source)
{
	return source ? source->user_volume : 0.0f;
}

float obs_source_get_present_volume(const obs_source_t *source)
{
	return source ? source->present_volume : 0.0f;
}

void obs_source_set_sync_offset(obs_source_t *source, int64_t offset)
{
	if (source) {
		struct calldata data = {0};

		calldata_set_ptr(&data, "source", source);
		calldata_set_int(&data, "offset", offset);

		signal_handler_signal(source->context.signals, "audio_sync",
				&data);

		source->sync_offset = calldata_int(&data, "offset");
		calldata_free(&data);
	}
}

int64_t obs_source_get_sync_offset(const obs_source_t *source)
{
	return source ? source->sync_offset : 0;
}

struct source_enum_data {
	obs_source_enum_proc_t enum_callback;
	void *param;
};

static void enum_source_tree_callback(obs_source_t *parent, obs_source_t *child,
		void *param)
{
	struct source_enum_data *data = param;

	if (child->info.enum_sources) {
		if (child->context.data) {
			child->info.enum_sources(child->context.data,
					enum_source_tree_callback, data);
		}
	}

	data->enum_callback(parent, child, data->param);
}

void obs_source_enum_sources(obs_source_t *source,
		obs_source_enum_proc_t enum_callback,
		void *param)
{
	if (!source_valid(source) || !source->info.enum_sources)
		return;

	obs_source_addref(source);

	source->info.enum_sources(source->context.data, enum_callback, param);

	obs_source_release(source);
}

void obs_source_enum_tree(obs_source_t *source,
		obs_source_enum_proc_t enum_callback,
		void *param)
{
	struct source_enum_data data = {enum_callback, param};

	if (!source_valid(source) || !source->info.enum_sources)
		return;

	obs_source_addref(source);

	source->info.enum_sources(source->context.data,
			enum_source_tree_callback,
			&data);

	obs_source_release(source);
}

struct descendant_info {
	bool exists;
	obs_source_t *target;
};

static void check_descendant(obs_source_t *parent, obs_source_t *child,
		void *param)
{
	struct descendant_info *info = param;
	if (child == info->target || parent == info->target)
		info->exists = true;
}

bool obs_source_add_child(obs_source_t *parent, obs_source_t *child)
{
	struct descendant_info info = {false, parent};
	if (!parent || !child || parent == child) return false;

	obs_source_enum_tree(child, check_descendant, &info);
	if (info.exists)
		return false;

	for (int i = 0; i < parent->show_refs; i++) {
		enum view_type type;
		type = (i < parent->activate_refs) ? MAIN_VIEW : AUX_VIEW;
		obs_source_activate(child, type);
	}

	return true;
}

void obs_source_remove_child(obs_source_t *parent, obs_source_t *child)
{
	if (!parent || !child) return;

	for (int i = 0; i < parent->show_refs; i++) {
		enum view_type type;
		type = (i < parent->activate_refs) ? MAIN_VIEW : AUX_VIEW;
		obs_source_deactivate(child, type);
	}
}

void obs_source_save(obs_source_t *source)
{
	if (!source_valid(source) || !source->info.save) return;
	source->info.save(source->context.data, source->context.settings);
}

void obs_source_load(obs_source_t *source)
{
	if (!source_valid(source) || !source->info.load) return;
	source->info.load(source->context.data, source->context.settings);
}

bool obs_source_active(const obs_source_t *source)
{
	return source ? source->activate_refs != 0 : false;
}

bool obs_source_showing(const obs_source_t *source)
{
	return source ? source->show_refs != 0 : false;
}

static inline void signal_flags_updated(obs_source_t *source)
{
	struct calldata data = {0};

	calldata_set_ptr(&data, "source", source);
	calldata_set_int(&data, "flags", source->flags);

	signal_handler_signal(source->context.signals, "update_flags", &data);

	calldata_free(&data);
}

void obs_source_set_flags(obs_source_t *source, uint32_t flags)
{
	if (!source) return;

	if (flags != source->flags) {
		source->flags = flags;
		signal_flags_updated(source);
	}
}

void obs_source_set_default_flags(obs_source_t *source, uint32_t flags)
{
	if (!source) return;

	source->default_flags = flags;
}

uint32_t obs_source_get_flags(const obs_source_t *source)
{
	return source ? source->flags : 0;
}

void obs_source_set_audio_mixers(obs_source_t *source, uint32_t mixers)
{
	struct calldata data = {0};
	uint32_t cur_mixers;

	if (!source) return;
	if ((source->info.output_flags & OBS_SOURCE_AUDIO) == 0) return;

	cur_mixers = audio_line_get_mixers(source->audio_line);
	if (cur_mixers == mixers)
		return;

	calldata_set_ptr(&data, "source", source);
	calldata_set_int(&data, "mixers", mixers);

	signal_handler_signal(source->context.signals, "audio_mixers", &data);

	mixers = (uint32_t)calldata_int(&data, "mixers");
	calldata_free(&data);

	audio_line_set_mixers(source->audio_line, mixers);
}

uint32_t obs_source_get_audio_mixers(const obs_source_t *source)
{
	if (!source) return 0;
	if ((source->info.output_flags & OBS_SOURCE_AUDIO) == 0) return 0;

	return audio_line_get_mixers(source->audio_line);
}

void obs_source_draw_set_color_matrix(const struct matrix4 *color_matrix,
		const struct vec3 *color_range_min,
		const struct vec3 *color_range_max)
{
	struct vec3 color_range_min_def;
	struct vec3 color_range_max_def;

	vec3_set(&color_range_min_def, 0.0f, 0.0f, 0.0f);
	vec3_set(&color_range_max_def, 1.0f, 1.0f, 1.0f);

	gs_effect_t *effect = gs_get_effect();
	gs_eparam_t *matrix;
	gs_eparam_t *range_min;
	gs_eparam_t *range_max;

	if (!effect) {
		blog(LOG_WARNING, "obs_source_draw_set_color_matrix: NULL "
				"effect");
		return;
	}

	if (!color_matrix) {
		blog(LOG_WARNING, "obs_source_draw_set_color_matrix: NULL "
				"color_matrix");
		return;
	}

	if (!color_range_min)
		color_range_min = &color_range_min_def;
	if (!color_range_max)
		color_range_max = &color_range_max_def;

	matrix = gs_effect_get_param_by_name(effect, "color_matrix");
	range_min = gs_effect_get_param_by_name(effect, "color_range_min");
	range_max = gs_effect_get_param_by_name(effect, "color_range_max");

	gs_effect_set_matrix4(matrix, color_matrix);
	gs_effect_set_val(range_min, color_range_min, sizeof(float)*3);
	gs_effect_set_val(range_max, color_range_max, sizeof(float)*3);
}

void obs_source_draw(gs_texture_t *texture, int x, int y, uint32_t cx,
		uint32_t cy, bool flip)
{
	gs_effect_t *effect = gs_get_effect();
	bool change_pos = (x != 0 || y != 0);
	gs_eparam_t *image;

	if (!effect) {
		blog(LOG_WARNING, "obs_source_draw: NULL effect");
		return;
	}

	if (!texture) {
		blog(LOG_WARNING, "obs_source_draw: NULL texture");
		return;
	}

	image = gs_effect_get_param_by_name(effect, "image");
	gs_effect_set_texture(image, texture);

	if (change_pos) {
		gs_matrix_push();
		gs_matrix_translate3f((float)x, (float)y, 0.0f);
	}

	gs_draw_sprite(texture, flip ? GS_FLIP_V : 0, cx, cy);

	if (change_pos)
		gs_matrix_pop();
}

static inline float get_transition_volume(obs_source_t *source,
		obs_source_t *child)
{
	if (source && child && source->info.get_transition_volume)
		return source->info.get_transition_volume(source->context.data,
				child);
	return 0.0f;
}

static float obs_source_get_target_volume_refs(obs_source_t *source,
		obs_source_t *target, int refs);

struct base_vol_enum_info {
	obs_source_t *target;
	float vol;
};

static void get_transition_child_vol(obs_source_t *parent, obs_source_t *child,
		void *param)
{
	struct base_vol_enum_info *info = param;
	float vol = obs_source_get_target_volume(child, info->target);

	info->vol += vol * get_transition_volume(parent, child);
}

static void get_source_base_vol(obs_source_t *parent, obs_source_t *child,
		void *param)
{
	struct base_vol_enum_info *info = param;
	float vol = obs_source_get_target_volume(child, info->target);

	if (vol > info->vol)
		info->vol = vol;

	UNUSED_PARAMETER(parent);
}

/*
 * This traverses a source tree for any references to a particular source.
 * If the source is found, it'll just return 1.0.  However, if the source
 * exists within some transition somewhere, the transition source will be able
 * to control what the volume of the source will be.  If the source is also
 * active outside the transition, then it'll just use 1.0.
 */
float obs_source_get_target_volume(obs_source_t *source, obs_source_t *target)
{
	struct base_vol_enum_info info = {target, 0.0f};
	bool transition = source->info.type == OBS_SOURCE_TYPE_TRANSITION;

	if (source == target)
		return 1.0f;

	if (source->info.enum_sources) {
		source->info.enum_sources(source->context.data,
				transition ?
					get_transition_child_vol :
					get_source_base_vol,
				&info);
	}

	return info.vol;
}

void obs_source_inc_showing(obs_source_t *source)
{
	obs_source_activate(source, AUX_VIEW);
}

void obs_source_dec_showing(obs_source_t *source)
{
	obs_source_deactivate(source, AUX_VIEW);
}

void obs_source_enum_filters(obs_source_t *source,
		obs_source_enum_proc_t callback, void *param)
{
	if (!source || !callback)
		return;

	pthread_mutex_lock(&source->filter_mutex);

	for (size_t i = 0; i < source->filters.num; i++) {
		struct obs_source *filter = source->filters.array[i];
		callback(source, filter, param);
	}

	pthread_mutex_unlock(&source->filter_mutex);
}

obs_source_t *obs_source_get_filter_by_name(obs_source_t *source,
		const char *name)
{
	obs_source_t *filter = NULL;

	if (!source || !name)
		return NULL;

	pthread_mutex_lock(&source->filter_mutex);

	for (size_t i = 0; i < source->filters.num; i++) {
		struct obs_source *cur_filter = source->filters.array[i];
		if (strcmp(cur_filter->context.name, name) == 0) {
			filter = cur_filter;
			obs_source_addref(filter);
			break;
		}
	}

	pthread_mutex_unlock(&source->filter_mutex);

	return filter;
}