/******************************************************************************
    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 "util/platform.h"
#include "obs.h"
#include "obs-internal.h"

#if BUILD_CAPTIONS
#include <caption/caption.h>
#include <caption/mpeg.h>
#endif

static inline bool active(const struct obs_output *output)
{
	return os_atomic_load_bool(&output->active);
}

static inline bool reconnecting(const struct obs_output *output)
{
	return os_atomic_load_bool(&output->reconnecting);
}

static inline bool stopping(const struct obs_output *output)
{
	return os_event_try(output->stopping_event) == EAGAIN;
}

static inline bool delay_active(const struct obs_output *output)
{
	return os_atomic_load_bool(&output->delay_active);
}

static inline bool delay_capturing(const struct obs_output *output)
{
	return os_atomic_load_bool(&output->delay_capturing);
}

static inline bool data_capture_ending(const struct obs_output *output)
{
	return os_atomic_load_bool(&output->end_data_capture_thread_active);
}

const struct obs_output_info *find_output(const char *id)
{
	size_t i;
	for (i = 0; i < obs->output_types.num; i++)
		if (strcmp(obs->output_types.array[i].id, id) == 0)
			return obs->output_types.array + i;

	return NULL;
}

const char *obs_output_get_display_name(const char *id)
{
	const struct obs_output_info *info = find_output(id);
	return (info != NULL) ? info->get_name(info->type_data) : NULL;
}

static const char *output_signals[] = {
	"void start(ptr output)",
	"void stop(ptr output, int code)",
	"void pause(ptr output)",
	"void unpause(ptr output)",
	"void starting(ptr output)",
	"void stopping(ptr output)",
	"void activate(ptr output)",
	"void deactivate(ptr output)",
	"void reconnect(ptr output)",
	"void reconnect_success(ptr output)",
	NULL,
};

static bool init_output_handlers(struct obs_output *output, const char *name,
				 obs_data_t *settings, obs_data_t *hotkey_data)
{
	if (!obs_context_data_init(&output->context, OBS_OBJ_TYPE_OUTPUT,
				   settings, name, hotkey_data, false))
		return false;

	signal_handler_add_array(output->context.signals, output_signals);
	return true;
}

obs_output_t *obs_output_create(const char *id, const char *name,
				obs_data_t *settings, obs_data_t *hotkey_data)
{
	const struct obs_output_info *info = find_output(id);
	struct obs_output *output;
	int ret;

	output = bzalloc(sizeof(struct obs_output));
	pthread_mutex_init_value(&output->interleaved_mutex);
	pthread_mutex_init_value(&output->delay_mutex);
	pthread_mutex_init_value(&output->caption_mutex);
	pthread_mutex_init_value(&output->pause.mutex);

	if (pthread_mutex_init(&output->interleaved_mutex, NULL) != 0)
		goto fail;
	if (pthread_mutex_init(&output->delay_mutex, NULL) != 0)
		goto fail;
	if (pthread_mutex_init(&output->caption_mutex, NULL) != 0)
		goto fail;
	if (pthread_mutex_init(&output->pause.mutex, NULL) != 0)
		goto fail;
	if (os_event_init(&output->stopping_event, OS_EVENT_TYPE_MANUAL) != 0)
		goto fail;
	if (!init_output_handlers(output, name, settings, hotkey_data))
		goto fail;

	os_event_signal(output->stopping_event);

	if (!info) {
		blog(LOG_ERROR, "Output ID '%s' not found", id);

		output->info.id = bstrdup(id);
		output->owns_info_id = true;
	} else {
		output->info = *info;
	}
	output->video = obs_get_video();
	output->audio = obs_get_audio();
	if (output->info.get_defaults)
		output->info.get_defaults(output->context.settings);

	ret = os_event_init(&output->reconnect_stop_event,
			    OS_EVENT_TYPE_MANUAL);
	if (ret < 0)
		goto fail;

	output->reconnect_retry_sec = 2;
	output->reconnect_retry_max = 20;
	output->valid = true;

	output->control = bzalloc(sizeof(obs_weak_output_t));
	output->control->output = output;

	obs_context_data_insert(&output->context, &obs->data.outputs_mutex,
				&obs->data.first_output);

	if (info)
		output->context.data =
			info->create(output->context.settings, output);
	if (!output->context.data)
		blog(LOG_ERROR, "Failed to create output '%s'!", name);

	blog(LOG_DEBUG, "output '%s' (%s) created", name, id);
	return output;

fail:
	obs_output_destroy(output);
	return NULL;
}

static inline void free_packets(struct obs_output *output)
{
	for (size_t i = 0; i < output->interleaved_packets.num; i++)
		obs_encoder_packet_release(output->interleaved_packets.array +
					   i);
	da_free(output->interleaved_packets);
}

static inline void clear_audio_buffers(obs_output_t *output)
{
	for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
		for (size_t j = 0; j < MAX_AV_PLANES; j++) {
			circlebuf_free(&output->audio_buffer[i][j]);
		}
	}
}

void obs_output_destroy(obs_output_t *output)
{
	if (output) {
		obs_context_data_remove(&output->context);

		blog(LOG_DEBUG, "output '%s' destroyed", output->context.name);

		if (output->valid && active(output))
			obs_output_actual_stop(output, true, 0);

		os_event_wait(output->stopping_event);
		if (data_capture_ending(output))
			pthread_join(output->end_data_capture_thread, NULL);

		if (output->service)
			output->service->output = NULL;
		if (output->context.data)
			output->info.destroy(output->context.data);

		free_packets(output);

		if (output->video_encoder) {
			obs_encoder_remove_output(output->video_encoder,
						  output);
		}

		for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
			if (output->audio_encoders[i]) {
				obs_encoder_remove_output(
					output->audio_encoders[i], output);
			}
		}

		clear_audio_buffers(output);

		os_event_destroy(output->stopping_event);
		pthread_mutex_destroy(&output->pause.mutex);
		pthread_mutex_destroy(&output->caption_mutex);
		pthread_mutex_destroy(&output->interleaved_mutex);
		pthread_mutex_destroy(&output->delay_mutex);
		os_event_destroy(output->reconnect_stop_event);
		obs_context_data_free(&output->context);
		circlebuf_free(&output->delay_data);
		if (output->owns_info_id)
			bfree((void *)output->info.id);
		if (output->last_error_message)
			bfree(output->last_error_message);
		bfree(output);
	}
}

const char *obs_output_get_name(const obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_get_name")
		       ? output->context.name
		       : NULL;
}

bool obs_output_actual_start(obs_output_t *output)
{
	bool success = false;

	os_event_wait(output->stopping_event);
	output->stop_code = 0;
	if (output->last_error_message) {
		bfree(output->last_error_message);
		output->last_error_message = NULL;
	}

	if (output->context.data)
		success = output->info.start(output->context.data);

	if (success && output->video) {
		output->starting_frame_count =
			video_output_get_total_frames(output->video);
		output->starting_drawn_count = obs->video.total_frames;
		output->starting_lagged_count = obs->video.lagged_frames;
	}

	if (os_atomic_load_long(&output->delay_restart_refs))
		os_atomic_dec_long(&output->delay_restart_refs);

	output->caption_timestamp = 0;
	return success;
}

bool obs_output_start(obs_output_t *output)
{
	bool encoded;
	bool has_service;
	if (!obs_output_valid(output, "obs_output_start"))
		return false;
	if (!output->context.data)
		return false;

	has_service = (output->info.flags & OBS_OUTPUT_SERVICE) != 0;
	if (has_service && !obs_service_initialize(output->service, output))
		return false;

	encoded = (output->info.flags & OBS_OUTPUT_ENCODED) != 0;
	if (encoded && output->delay_sec) {
		return obs_output_delay_start(output);
	} else {
		if (obs_output_actual_start(output)) {
			do_output_signal(output, "starting");
			return true;
		}

		return false;
	}
}

static inline bool data_active(struct obs_output *output)
{
	return os_atomic_load_bool(&output->data_active);
}

static void log_frame_info(struct obs_output *output)
{
	struct obs_core_video *video = &obs->video;

	uint32_t drawn = video->total_frames - output->starting_drawn_count;
	uint32_t lagged = video->lagged_frames - output->starting_lagged_count;

	int dropped = obs_output_get_frames_dropped(output);
	int total = output->total_frames;

	double percentage_lagged = 0.0f;
	double percentage_dropped = 0.0f;

	if (drawn)
		percentage_lagged = (double)lagged / (double)drawn * 100.0;
	if (dropped)
		percentage_dropped = (double)dropped / (double)total * 100.0;

	blog(LOG_INFO, "Output '%s': stopping", output->context.name);
	if (!dropped || !total)
		blog(LOG_INFO, "Output '%s': Total frames output: %d",
		     output->context.name, total);
	else
		blog(LOG_INFO,
		     "Output '%s': Total frames output: %d"
		     " (%d attempted)",
		     output->context.name, total - dropped, total);

	if (!lagged || !drawn)
		blog(LOG_INFO, "Output '%s': Total drawn frames: %" PRIu32,
		     output->context.name, drawn);
	else
		blog(LOG_INFO,
		     "Output '%s': Total drawn frames: %" PRIu32 " (%" PRIu32
		     " attempted)",
		     output->context.name, drawn - lagged, drawn);

	if (drawn && lagged)
		blog(LOG_INFO,
		     "Output '%s': Number of lagged frames due "
		     "to rendering lag/stalls: %" PRIu32 " (%0.1f%%)",
		     output->context.name, lagged, percentage_lagged);
	if (total && dropped)
		blog(LOG_INFO,
		     "Output '%s': Number of dropped frames due "
		     "to insufficient bandwidth/connection stalls: "
		     "%d (%0.1f%%)",
		     output->context.name, dropped, percentage_dropped);
}

static inline void signal_stop(struct obs_output *output);

void obs_output_actual_stop(obs_output_t *output, bool force, uint64_t ts)
{
	bool call_stop = true;
	bool was_reconnecting = false;

	if (stopping(output) && !force)
		return;

	obs_output_pause(output, false);

	os_event_reset(output->stopping_event);

	was_reconnecting = reconnecting(output) && !delay_active(output);
	if (reconnecting(output)) {
		os_event_signal(output->reconnect_stop_event);
		if (output->reconnect_thread_active)
			pthread_join(output->reconnect_thread, NULL);
	}

	if (force) {
		if (delay_active(output)) {
			call_stop = delay_capturing(output);
			os_atomic_set_bool(&output->delay_active, false);
			os_atomic_set_bool(&output->delay_capturing, false);
			output->stop_code = OBS_OUTPUT_SUCCESS;
			obs_output_end_data_capture(output);
			os_event_signal(output->stopping_event);
		} else {
			call_stop = true;
		}
	} else {
		call_stop = true;
	}

	if (output->context.data && call_stop) {
		output->info.stop(output->context.data, ts);

	} else if (was_reconnecting) {
		output->stop_code = OBS_OUTPUT_SUCCESS;
		signal_stop(output);
		os_event_signal(output->stopping_event);
	}

	while (output->caption_head) {
		output->caption_tail = output->caption_head->next;
		bfree(output->caption_head);
		output->caption_head = output->caption_tail;
	}
}

void obs_output_stop(obs_output_t *output)
{
	bool encoded;
	if (!obs_output_valid(output, "obs_output_stop"))
		return;
	if (!output->context.data)
		return;
	if (!active(output) && !reconnecting(output))
		return;
	if (reconnecting(output)) {
		obs_output_force_stop(output);
		return;
	}

	encoded = (output->info.flags & OBS_OUTPUT_ENCODED) != 0;

	if (encoded && output->active_delay_ns) {
		obs_output_delay_stop(output);

	} else if (!stopping(output)) {
		do_output_signal(output, "stopping");
		obs_output_actual_stop(output, false, os_gettime_ns());
	}
}

void obs_output_force_stop(obs_output_t *output)
{
	if (!obs_output_valid(output, "obs_output_force_stop"))
		return;

	if (!stopping(output)) {
		output->stop_code = 0;
		do_output_signal(output, "stopping");
	}
	obs_output_actual_stop(output, true, 0);
}

bool obs_output_active(const obs_output_t *output)
{
	return (output != NULL) ? (active(output) || reconnecting(output))
				: false;
}

uint32_t obs_output_get_flags(const obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_get_flags")
		       ? output->info.flags
		       : 0;
}

uint32_t obs_get_output_flags(const char *id)
{
	const struct obs_output_info *info = find_output(id);
	return info ? info->flags : 0;
}

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

obs_data_t *obs_output_defaults(const char *id)
{
	const struct obs_output_info *info = find_output(id);
	return (info) ? get_defaults(info) : NULL;
}

obs_properties_t *obs_get_output_properties(const char *id)
{
	const struct obs_output_info *info = find_output(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_output_properties(const obs_output_t *output)
{
	if (!obs_output_valid(output, "obs_output_properties"))
		return NULL;

	if (output && output->info.get_properties) {
		obs_properties_t *props;
		props = output->info.get_properties(output->context.data);
		obs_properties_apply_settings(props, output->context.settings);
		return props;
	}

	return NULL;
}

void obs_output_update(obs_output_t *output, obs_data_t *settings)
{
	if (!obs_output_valid(output, "obs_output_update"))
		return;

	obs_data_apply(output->context.settings, settings);

	if (output->info.update)
		output->info.update(output->context.data,
				    output->context.settings);
}

obs_data_t *obs_output_get_settings(const obs_output_t *output)
{
	if (!obs_output_valid(output, "obs_output_get_settings"))
		return NULL;

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

bool obs_output_can_pause(const obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_can_pause")
		       ? !!(output->info.flags & OBS_OUTPUT_CAN_PAUSE)
		       : false;
}

static inline void end_pause(struct pause_data *pause, uint64_t ts)
{
	if (!pause->ts_end) {
		pause->ts_end = ts;
		pause->ts_offset += pause->ts_end - pause->ts_start;
	}
}

static inline uint64_t get_closest_v_ts(struct pause_data *pause)
{
	uint64_t interval = obs->video.video_frame_interval_ns;
	uint64_t i2 = interval * 2;
	uint64_t ts = os_gettime_ns();

	return pause->last_video_ts +
	       ((ts - pause->last_video_ts + i2) / interval) * interval;
}

static inline bool pause_can_start(struct pause_data *pause)
{
	return !pause->ts_start && !pause->ts_end;
}

static inline bool pause_can_stop(struct pause_data *pause)
{
	return !!pause->ts_start && !pause->ts_end;
}

static bool obs_encoded_output_pause(obs_output_t *output, bool pause)
{
	obs_encoder_t *venc;
	obs_encoder_t *aenc[MAX_AUDIO_MIXES];
	uint64_t closest_v_ts;
	bool success = false;

	venc = output->video_encoder;
	for (size_t i = 0; i < MAX_AUDIO_MIXES; i++)
		aenc[i] = output->audio_encoders[i];

	pthread_mutex_lock(&venc->pause.mutex);
	for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
		if (aenc[i]) {
			pthread_mutex_lock(&aenc[i]->pause.mutex);
		}
	}

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

	closest_v_ts = get_closest_v_ts(&venc->pause);

	if (pause) {
		if (!pause_can_start(&venc->pause)) {
			goto fail;
		}
		for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
			if (aenc[i] && !pause_can_start(&aenc[i]->pause)) {
				goto fail;
			}
		}

		os_atomic_set_bool(&venc->paused, true);
		venc->pause.ts_start = closest_v_ts;

		for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
			if (aenc[i]) {
				os_atomic_set_bool(&aenc[i]->paused, true);
				aenc[i]->pause.ts_start = closest_v_ts;
			}
		}
	} else {
		if (!pause_can_stop(&venc->pause)) {
			goto fail;
		}
		for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
			if (aenc[i] && !pause_can_stop(&aenc[i]->pause)) {
				goto fail;
			}
		}

		os_atomic_set_bool(&venc->paused, false);
		end_pause(&venc->pause, closest_v_ts);

		for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
			if (aenc[i]) {
				os_atomic_set_bool(&aenc[i]->paused, false);
				end_pause(&aenc[i]->pause, closest_v_ts);
			}
		}
	}

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

	success = true;

fail:
	for (size_t i = MAX_AUDIO_MIXES; i > 0; i--) {
		if (aenc[i - 1]) {
			pthread_mutex_unlock(&aenc[i - 1]->pause.mutex);
		}
	}
	pthread_mutex_unlock(&venc->pause.mutex);

	return success;
}

static bool obs_raw_output_pause(obs_output_t *output, bool pause)
{
	bool success;
	uint64_t closest_v_ts;

	pthread_mutex_lock(&output->pause.mutex);
	closest_v_ts = get_closest_v_ts(&output->pause);
	if (pause) {
		success = pause_can_start(&output->pause);
		if (success)
			output->pause.ts_start = closest_v_ts;
	} else {
		success = pause_can_stop(&output->pause);
		if (success)
			end_pause(&output->pause, closest_v_ts);
	}
	pthread_mutex_unlock(&output->pause.mutex);

	return success;
}

bool obs_output_pause(obs_output_t *output, bool pause)
{
	bool success;

	if (!obs_output_valid(output, "obs_output_pause"))
		return false;
	if ((output->info.flags & OBS_OUTPUT_CAN_PAUSE) == 0)
		return false;
	if (!os_atomic_load_bool(&output->active))
		return false;
	if (os_atomic_load_bool(&output->paused) == pause)
		return true;

	success = ((output->info.flags & OBS_OUTPUT_ENCODED) != 0)
			  ? obs_encoded_output_pause(output, pause)
			  : obs_raw_output_pause(output, pause);
	if (success) {
		os_atomic_set_bool(&output->paused, pause);
		do_output_signal(output, pause ? "pause" : "unpause");

		blog(LOG_INFO, "output %s %spaused", output->context.name,
		     pause ? "" : "un");
	}
	return success;
}

bool obs_output_paused(const obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_paused")
		       ? os_atomic_load_bool(&output->paused)
		       : false;
}

uint64_t obs_output_get_pause_offset(obs_output_t *output)
{
	uint64_t offset;

	if (!obs_output_valid(output, "obs_output_get_pause_offset"))
		return 0;

	pthread_mutex_lock(&output->pause.mutex);
	offset = output->pause.ts_offset;
	pthread_mutex_unlock(&output->pause.mutex);

	return offset;
}

signal_handler_t *obs_output_get_signal_handler(const obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_get_signal_handler")
		       ? output->context.signals
		       : NULL;
}

proc_handler_t *obs_output_get_proc_handler(const obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_get_proc_handler")
		       ? output->context.procs
		       : NULL;
}

void obs_output_set_media(obs_output_t *output, video_t *video, audio_t *audio)
{
	if (!obs_output_valid(output, "obs_output_set_media"))
		return;

	output->video = video;
	output->audio = audio;
}

video_t *obs_output_video(const obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_video") ? output->video
							    : NULL;
}

audio_t *obs_output_audio(const obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_audio") ? output->audio
							    : NULL;
}

static inline size_t get_first_mixer(const obs_output_t *output)
{
	for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
		if ((((size_t)1 << i) & output->mixer_mask) != 0) {
			return i;
		}
	}

	return 0;
}

void obs_output_set_mixer(obs_output_t *output, size_t mixer_idx)
{
	if (!obs_output_valid(output, "obs_output_set_mixer"))
		return;

	if (!active(output))
		output->mixer_mask = (size_t)1 << mixer_idx;
}

size_t obs_output_get_mixer(const obs_output_t *output)
{
	if (!obs_output_valid(output, "obs_output_get_mixer"))
		return 0;

	return get_first_mixer(output);
}

void obs_output_set_mixers(obs_output_t *output, size_t mixers)
{
	if (!obs_output_valid(output, "obs_output_set_mixers"))
		return;

	output->mixer_mask = mixers;
}

size_t obs_output_get_mixers(const obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_get_mixers")
		       ? output->mixer_mask
		       : 0;
}

void obs_output_remove_encoder(struct obs_output *output,
			       struct obs_encoder *encoder)
{
	if (!obs_output_valid(output, "obs_output_remove_encoder"))
		return;

	if (output->video_encoder == encoder) {
		output->video_encoder = NULL;
	} else {
		for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
			if (output->audio_encoders[i] == encoder)
				output->audio_encoders[i] = NULL;
		}
	}
}

void obs_output_set_video_encoder(obs_output_t *output, obs_encoder_t *encoder)
{
	if (!obs_output_valid(output, "obs_output_set_video_encoder"))
		return;
	if (encoder && encoder->info.type != OBS_ENCODER_VIDEO) {
		blog(LOG_WARNING, "obs_output_set_video_encoder: "
				  "encoder passed is not a video encoder");
		return;
	}

	if (output->video_encoder == encoder)
		return;

	obs_encoder_remove_output(output->video_encoder, output);
	obs_encoder_add_output(encoder, output);
	output->video_encoder = encoder;

	/* set the preferred resolution on the encoder */
	if (output->scaled_width && output->scaled_height)
		obs_encoder_set_scaled_size(output->video_encoder,
					    output->scaled_width,
					    output->scaled_height);
}

void obs_output_set_audio_encoder(obs_output_t *output, obs_encoder_t *encoder,
				  size_t idx)
{
	if (!obs_output_valid(output, "obs_output_set_audio_encoder"))
		return;
	if (encoder && encoder->info.type != OBS_ENCODER_AUDIO) {
		blog(LOG_WARNING, "obs_output_set_audio_encoder: "
				  "encoder passed is not an audio encoder");
		return;
	}

	if ((output->info.flags & OBS_OUTPUT_MULTI_TRACK) != 0) {
		if (idx >= MAX_AUDIO_MIXES) {
			return;
		}
	} else {
		if (idx > 0) {
			return;
		}
	}

	if (output->audio_encoders[idx] == encoder)
		return;

	obs_encoder_remove_output(output->audio_encoders[idx], output);
	obs_encoder_add_output(encoder, output);
	output->audio_encoders[idx] = encoder;
}

obs_encoder_t *obs_output_get_video_encoder(const obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_get_video_encoder")
		       ? output->video_encoder
		       : NULL;
}

obs_encoder_t *obs_output_get_audio_encoder(const obs_output_t *output,
					    size_t idx)
{
	if (!obs_output_valid(output, "obs_output_get_audio_encoder"))
		return NULL;

	if ((output->info.flags & OBS_OUTPUT_MULTI_TRACK) != 0) {
		if (idx >= MAX_AUDIO_MIXES) {
			return NULL;
		}
	} else {
		if (idx > 0) {
			return NULL;
		}
	}

	return output->audio_encoders[idx];
}

void obs_output_set_service(obs_output_t *output, obs_service_t *service)
{
	if (!obs_output_valid(output, "obs_output_set_service"))
		return;
	if (active(output) || !service || service->active)
		return;

	if (service->output)
		service->output->service = NULL;

	output->service = service;
	service->output = output;
}

obs_service_t *obs_output_get_service(const obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_get_service")
		       ? output->service
		       : NULL;
}

void obs_output_set_reconnect_settings(obs_output_t *output, int retry_count,
				       int retry_sec)
{
	if (!obs_output_valid(output, "obs_output_set_reconnect_settings"))
		return;

	output->reconnect_retry_max = retry_count;
	output->reconnect_retry_sec = retry_sec;
}

uint64_t obs_output_get_total_bytes(const obs_output_t *output)
{
	if (!obs_output_valid(output, "obs_output_get_total_bytes"))
		return 0;
	if (!output->info.get_total_bytes)
		return 0;

	if (delay_active(output) && !delay_capturing(output))
		return 0;

	return output->info.get_total_bytes(output->context.data);
}

int obs_output_get_frames_dropped(const obs_output_t *output)
{
	if (!obs_output_valid(output, "obs_output_get_frames_dropped"))
		return 0;
	if (!output->info.get_dropped_frames)
		return 0;

	return output->info.get_dropped_frames(output->context.data);
}

int obs_output_get_total_frames(const obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_get_total_frames")
		       ? output->total_frames
		       : 0;
}

void obs_output_set_preferred_size(obs_output_t *output, uint32_t width,
				   uint32_t height)
{
	if (!obs_output_valid(output, "obs_output_set_preferred_size"))
		return;
	if ((output->info.flags & OBS_OUTPUT_VIDEO) == 0)
		return;

	if (active(output)) {
		blog(LOG_WARNING,
		     "output '%s': Cannot set the preferred "
		     "resolution while the output is active",
		     obs_output_get_name(output));
		return;
	}

	output->scaled_width = width;
	output->scaled_height = height;

	if (output->info.flags & OBS_OUTPUT_ENCODED) {
		if (output->video_encoder)
			obs_encoder_set_scaled_size(output->video_encoder,
						    width, height);
	}
}

uint32_t obs_output_get_width(const obs_output_t *output)
{
	if (!obs_output_valid(output, "obs_output_get_width"))
		return 0;
	if ((output->info.flags & OBS_OUTPUT_VIDEO) == 0)
		return 0;

	if (output->info.flags & OBS_OUTPUT_ENCODED)
		return obs_encoder_get_width(output->video_encoder);
	else
		return output->scaled_width != 0
			       ? output->scaled_width
			       : video_output_get_width(output->video);
}

uint32_t obs_output_get_height(const obs_output_t *output)
{
	if (!obs_output_valid(output, "obs_output_get_height"))
		return 0;
	if ((output->info.flags & OBS_OUTPUT_VIDEO) == 0)
		return 0;

	if (output->info.flags & OBS_OUTPUT_ENCODED)
		return obs_encoder_get_height(output->video_encoder);
	else
		return output->scaled_height != 0
			       ? output->scaled_height
			       : video_output_get_height(output->video);
}

void obs_output_set_video_conversion(obs_output_t *output,
				     const struct video_scale_info *conversion)
{
	if (!obs_output_valid(output, "obs_output_set_video_conversion"))
		return;
	if (!obs_ptr_valid(conversion, "obs_output_set_video_conversion"))
		return;

	output->video_conversion = *conversion;
	output->video_conversion_set = true;
}

void obs_output_set_audio_conversion(
	obs_output_t *output, const struct audio_convert_info *conversion)
{
	if (!obs_output_valid(output, "obs_output_set_audio_conversion"))
		return;
	if (!obs_ptr_valid(conversion, "obs_output_set_audio_conversion"))
		return;

	output->audio_conversion = *conversion;
	output->audio_conversion_set = true;
}

static inline bool service_supports_multitrack(const struct obs_output *output)
{
	const struct obs_service *service = output->service;

	if (!service || !service->info.supports_multitrack) {
		return false;
	}

	return service->info.supports_multitrack(service->context.data);
}

static inline size_t num_audio_mixes(const struct obs_output *output)
{
	size_t mix_count = 1;

	if ((output->info.flags & OBS_OUTPUT_SERVICE) != 0) {
		if (!service_supports_multitrack(output)) {
			return 1;
		}
	}

	if ((output->info.flags & OBS_OUTPUT_MULTI_TRACK) != 0) {
		mix_count = 0;

		for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
			if (!output->audio_encoders[i])
				break;

			mix_count++;
		}
	}

	return mix_count;
}

static inline bool audio_valid(const struct obs_output *output, bool encoded)
{
	if (encoded) {
		size_t mix_count = num_audio_mixes(output);
		if (!mix_count)
			return false;

		for (size_t i = 0; i < mix_count; i++) {
			if (!output->audio_encoders[i]) {
				return false;
			}
		}
	} else {
		if (!output->audio)
			return false;
	}

	return true;
}

static bool can_begin_data_capture(const struct obs_output *output,
				   bool encoded, bool has_video, bool has_audio,
				   bool has_service)
{
	if (has_video) {
		if (encoded) {
			if (!output->video_encoder)
				return false;
		} else {
			if (!output->video)
				return false;
		}
	}

	if (has_audio) {
		if (!audio_valid(output, encoded)) {
			return false;
		}
	}

	if (has_service && !output->service)
		return false;

	return true;
}

static inline bool has_scaling(const struct obs_output *output)
{
	uint32_t video_width = video_output_get_width(output->video);
	uint32_t video_height = video_output_get_height(output->video);

	return output->scaled_width && output->scaled_height &&
	       (video_width != output->scaled_width ||
		video_height != output->scaled_height);
}

static inline struct video_scale_info *
get_video_conversion(struct obs_output *output)
{
	if (output->video_conversion_set) {
		if (!output->video_conversion.width)
			output->video_conversion.width =
				obs_output_get_width(output);

		if (!output->video_conversion.height)
			output->video_conversion.height =
				obs_output_get_height(output);

		return &output->video_conversion;

	} else if (has_scaling(output)) {
		const struct video_output_info *info =
			video_output_get_info(output->video);

		output->video_conversion.format = info->format;
		output->video_conversion.colorspace = VIDEO_CS_DEFAULT;
		output->video_conversion.range = VIDEO_RANGE_DEFAULT;
		output->video_conversion.width = output->scaled_width;
		output->video_conversion.height = output->scaled_height;
		return &output->video_conversion;
	}

	return NULL;
}

static inline struct audio_convert_info *
get_audio_conversion(struct obs_output *output)
{
	return output->audio_conversion_set ? &output->audio_conversion : NULL;
}

static size_t get_track_index(const struct obs_output *output,
			      struct encoder_packet *pkt)
{
	for (size_t i = 0; i < MAX_AUDIO_MIXES; i++) {
		struct obs_encoder *encoder = output->audio_encoders[i];

		if (pkt->encoder == encoder)
			return i;
	}

	assert(false);
	return 0;
}

static inline void check_received(struct obs_output *output,
				  struct encoder_packet *out)
{
	if (out->type == OBS_ENCODER_VIDEO) {
		if (!output->received_video)
			output->received_video = true;
	} else {
		if (!output->received_audio)
			output->received_audio = true;
	}
}

static inline void apply_interleaved_packet_offset(struct obs_output *output,
						   struct encoder_packet *out)
{
	int64_t offset;

	/* audio and video need to start at timestamp 0, and the encoders
	 * may not currently be at 0 when we get data.  so, we store the
	 * current dts as offset and subtract that value from the dts/pts
	 * of the output packet. */
	offset = (out->type == OBS_ENCODER_VIDEO)
			 ? output->video_offset
			 : output->audio_offsets[out->track_idx];

	out->dts -= offset;
	out->pts -= offset;

	/* convert the newly adjusted dts to relative dts time to ensure proper
	 * interleaving.  if we're using an audio encoder that's already been
	 * started on another output, then the first audio packet may not be
	 * quite perfectly synced up in terms of system time (and there's
	 * nothing we can really do about that), but it will always at least be
	 * within a 23ish millisecond threshold (at least for AAC) */
	out->dts_usec = packet_dts_usec(out);
}

static inline bool has_higher_opposing_ts(struct obs_output *output,
					  struct encoder_packet *packet)
{
	if (packet->type == OBS_ENCODER_VIDEO)
		return output->highest_audio_ts > packet->dts_usec;
	else
		return output->highest_video_ts > packet->dts_usec;
}

#if BUILD_CAPTIONS
static const uint8_t nal_start[4] = {0, 0, 0, 1};

static bool add_caption(struct obs_output *output, struct encoder_packet *out)
{
	struct encoder_packet backup = *out;
	caption_frame_t cf;
	sei_t sei;
	uint8_t *data;
	size_t size;
	long ref = 1;

	DARRAY(uint8_t) out_data;

	if (out->priority > 1)
		return false;

	sei_init(&sei, 0.0);

	da_init(out_data);
	da_push_back_array(out_data, &ref, sizeof(ref));
	da_push_back_array(out_data, out->data, out->size);

	caption_frame_init(&cf);
	caption_frame_from_text(&cf, &output->caption_head->text[0]);

	sei_from_caption_frame(&sei, &cf);

	data = malloc(sei_render_size(&sei));
	size = sei_render(&sei, data);
	/* TODO SEI should come after AUD/SPS/PPS, but before any VCL */
	da_push_back_array(out_data, nal_start, 4);
	da_push_back_array(out_data, data, size);
	free(data);

	obs_encoder_packet_release(out);

	*out = backup;
	out->data = (uint8_t *)out_data.array + sizeof(ref);
	out->size = out_data.num - sizeof(ref);

	sei_free(&sei);

	struct caption_text *next = output->caption_head->next;
	bfree(output->caption_head);
	output->caption_head = next;
	return true;
}
#endif

static inline void send_interleaved(struct obs_output *output)
{
	struct encoder_packet out = output->interleaved_packets.array[0];

	/* do not send an interleaved packet if there's no packet of the
	 * opposing type of a higher timestamp in the interleave buffer.
	 * this ensures that the timestamps are monotonic */
	if (!has_higher_opposing_ts(output, &out))
		return;

	da_erase(output->interleaved_packets, 0);

	if (out.type == OBS_ENCODER_VIDEO) {
		output->total_frames++;

#if BUILD_CAPTIONS
		pthread_mutex_lock(&output->caption_mutex);

		double frame_timestamp =
			(out.pts * out.timebase_num) / (double)out.timebase_den;

		if (output->caption_head &&
		    output->caption_timestamp <= frame_timestamp) {
			blog(LOG_DEBUG, "Sending caption: %f \"%s\"",
			     frame_timestamp, &output->caption_head->text[0]);

			double display_duration =
				output->caption_head->display_duration;

			if (add_caption(output, &out)) {
				output->caption_timestamp =
					frame_timestamp + display_duration;
			}
		}

		pthread_mutex_unlock(&output->caption_mutex);
#endif
	}

	output->info.encoded_packet(output->context.data, &out);
	obs_encoder_packet_release(&out);
}

static inline void set_higher_ts(struct obs_output *output,
				 struct encoder_packet *packet)
{
	if (packet->type == OBS_ENCODER_VIDEO) {
		if (output->highest_video_ts < packet->dts_usec)
			output->highest_video_ts = packet->dts_usec;
	} else {
		if (output->highest_audio_ts < packet->dts_usec)
			output->highest_audio_ts = packet->dts_usec;
	}
}

static inline struct encoder_packet *
find_first_packet_type(struct obs_output *output, enum obs_encoder_type type,
		       size_t audio_idx);
static int find_first_packet_type_idx(struct obs_output *output,
				      enum obs_encoder_type type,
				      size_t audio_idx);

/* gets the point where audio and video are closest together */
static size_t get_interleaved_start_idx(struct obs_output *output)
{
	int64_t closest_diff = 0x7FFFFFFFFFFFFFFFLL;
	struct encoder_packet *first_video =
		find_first_packet_type(output, OBS_ENCODER_VIDEO, 0);
	size_t video_idx = DARRAY_INVALID;
	size_t idx = 0;

	for (size_t i = 0; i < output->interleaved_packets.num; i++) {
		struct encoder_packet *packet =
			&output->interleaved_packets.array[i];
		int64_t diff;

		if (packet->type != OBS_ENCODER_AUDIO) {
			if (packet == first_video)
				video_idx = i;
			continue;
		}

		diff = llabs(packet->dts_usec - first_video->dts_usec);
		if (diff < closest_diff) {
			closest_diff = diff;
			idx = i;
		}
	}

	return video_idx < idx ? video_idx : idx;
}

static int prune_premature_packets(struct obs_output *output)
{
	size_t audio_mixes = num_audio_mixes(output);
	struct encoder_packet *video;
	int video_idx;
	int max_idx;
	int64_t duration_usec;
	int64_t max_diff = 0;
	int64_t diff = 0;

	video_idx = find_first_packet_type_idx(output, OBS_ENCODER_VIDEO, 0);
	if (video_idx == -1) {
		output->received_video = false;
		return -1;
	}

	max_idx = video_idx;
	video = &output->interleaved_packets.array[video_idx];
	duration_usec = video->timebase_num * 1000000LL / video->timebase_den;

	for (size_t i = 0; i < audio_mixes; i++) {
		struct encoder_packet *audio;
		int audio_idx;

		audio_idx = find_first_packet_type_idx(output,
						       OBS_ENCODER_AUDIO, i);
		if (audio_idx == -1) {
			output->received_audio = false;
			return -1;
		}

		audio = &output->interleaved_packets.array[audio_idx];
		if (audio_idx > max_idx)
			max_idx = audio_idx;

		diff = audio->dts_usec - video->dts_usec;
		if (diff > max_diff)
			max_diff = diff;
	}

	return diff > duration_usec ? max_idx + 1 : 0;
}

static void discard_to_idx(struct obs_output *output, size_t idx)
{
	for (size_t i = 0; i < idx; i++) {
		struct encoder_packet *packet =
			&output->interleaved_packets.array[i];
		obs_encoder_packet_release(packet);
	}

	da_erase_range(output->interleaved_packets, 0, idx);
}

#define DEBUG_STARTING_PACKETS 0

static bool prune_interleaved_packets(struct obs_output *output)
{
	size_t start_idx = 0;
	int prune_start = prune_premature_packets(output);

#if DEBUG_STARTING_PACKETS == 1
	blog(LOG_DEBUG, "--------- Pruning! %d ---------", prune_start);
	for (size_t i = 0; i < output->interleaved_packets.num; i++) {
		struct encoder_packet *packet =
			&output->interleaved_packets.array[i];
		blog(LOG_DEBUG, "packet: %s %d, ts: %lld, pruned = %s",
		     packet->type == OBS_ENCODER_AUDIO ? "audio" : "video",
		     (int)packet->track_idx, packet->dts_usec,
		     (int)i < prune_start ? "true" : "false");
	}
#endif

	/* prunes the first video packet if it's too far away from audio */
	if (prune_start == -1)
		return false;
	else if (prune_start != 0)
		start_idx = (size_t)prune_start;
	else
		start_idx = get_interleaved_start_idx(output);

	if (start_idx)
		discard_to_idx(output, start_idx);

	return true;
}

static int find_first_packet_type_idx(struct obs_output *output,
				      enum obs_encoder_type type,
				      size_t audio_idx)
{
	for (size_t i = 0; i < output->interleaved_packets.num; i++) {
		struct encoder_packet *packet =
			&output->interleaved_packets.array[i];

		if (packet->type == type) {
			if (type == OBS_ENCODER_AUDIO &&
			    packet->track_idx != audio_idx) {
				continue;
			}

			return (int)i;
		}
	}

	return -1;
}

static int find_last_packet_type_idx(struct obs_output *output,
				     enum obs_encoder_type type,
				     size_t audio_idx)
{
	for (size_t i = output->interleaved_packets.num; i > 0; i--) {
		struct encoder_packet *packet =
			&output->interleaved_packets.array[i - 1];

		if (packet->type == type) {
			if (type == OBS_ENCODER_AUDIO &&
			    packet->track_idx != audio_idx) {
				continue;
			}

			return (int)(i - 1);
		}
	}

	return -1;
}

static inline struct encoder_packet *
find_first_packet_type(struct obs_output *output, enum obs_encoder_type type,
		       size_t audio_idx)
{
	int idx = find_first_packet_type_idx(output, type, audio_idx);
	return (idx != -1) ? &output->interleaved_packets.array[idx] : NULL;
}

static inline struct encoder_packet *
find_last_packet_type(struct obs_output *output, enum obs_encoder_type type,
		      size_t audio_idx)
{
	int idx = find_last_packet_type_idx(output, type, audio_idx);
	return (idx != -1) ? &output->interleaved_packets.array[idx] : NULL;
}

static bool get_audio_and_video_packets(struct obs_output *output,
					struct encoder_packet **video,
					struct encoder_packet **audio,
					size_t audio_mixes)
{
	*video = find_first_packet_type(output, OBS_ENCODER_VIDEO, 0);
	if (!*video)
		output->received_video = false;

	for (size_t i = 0; i < audio_mixes; i++) {
		audio[i] = find_first_packet_type(output, OBS_ENCODER_AUDIO, i);
		if (!audio[i]) {
			output->received_audio = false;
			return false;
		}
	}

	if (!*video) {
		return false;
	}

	return true;
}

static bool initialize_interleaved_packets(struct obs_output *output)
{
	struct encoder_packet *video;
	struct encoder_packet *audio[MAX_AUDIO_MIXES];
	struct encoder_packet *last_audio[MAX_AUDIO_MIXES];
	size_t audio_mixes = num_audio_mixes(output);
	size_t start_idx;

	if (!get_audio_and_video_packets(output, &video, audio, audio_mixes))
		return false;

	for (size_t i = 0; i < audio_mixes; i++)
		last_audio[i] =
			find_last_packet_type(output, OBS_ENCODER_AUDIO, i);

	/* ensure that there is audio past the first video packet */
	for (size_t i = 0; i < audio_mixes; i++) {
		if (last_audio[i]->dts_usec < video->dts_usec) {
			output->received_audio = false;
			return false;
		}
	}

	/* clear out excess starting audio if it hasn't been already */
	start_idx = get_interleaved_start_idx(output);
	if (start_idx) {
		discard_to_idx(output, start_idx);
		if (!get_audio_and_video_packets(output, &video, audio,
						 audio_mixes))
			return false;
	}

	/* get new offsets */
	output->video_offset = video->pts;
	for (size_t i = 0; i < audio_mixes; i++)
		output->audio_offsets[i] = audio[i]->dts;

#if DEBUG_STARTING_PACKETS == 1
	int64_t v = video->dts_usec;
	int64_t a = audio[0]->dts_usec;
	int64_t diff = v - a;

	blog(LOG_DEBUG,
	     "output '%s' offset for video: %lld, audio: %lld, "
	     "diff: %lldms",
	     output->context.name, v, a, diff / 1000LL);
#endif

	/* subtract offsets from highest TS offset variables */
	output->highest_audio_ts -= audio[0]->dts_usec;
	output->highest_video_ts -= video->dts_usec;

	/* apply new offsets to all existing packet DTS/PTS values */
	for (size_t i = 0; i < output->interleaved_packets.num; i++) {
		struct encoder_packet *packet =
			&output->interleaved_packets.array[i];
		apply_interleaved_packet_offset(output, packet);
	}

	return true;
}

static inline void insert_interleaved_packet(struct obs_output *output,
					     struct encoder_packet *out)
{
	size_t idx;
	for (idx = 0; idx < output->interleaved_packets.num; idx++) {
		struct encoder_packet *cur_packet;
		cur_packet = output->interleaved_packets.array + idx;

		if (out->dts_usec == cur_packet->dts_usec &&
		    out->type == OBS_ENCODER_VIDEO) {
			break;
		} else if (out->dts_usec < cur_packet->dts_usec) {
			break;
		}
	}

	da_insert(output->interleaved_packets, idx, out);
}

static void resort_interleaved_packets(struct obs_output *output)
{
	DARRAY(struct encoder_packet) old_array;

	old_array.da = output->interleaved_packets.da;
	memset(&output->interleaved_packets, 0,
	       sizeof(output->interleaved_packets));

	for (size_t i = 0; i < old_array.num; i++)
		insert_interleaved_packet(output, &old_array.array[i]);

	da_free(old_array);
}

static void discard_unused_audio_packets(struct obs_output *output,
					 int64_t dts_usec)
{
	size_t idx = 0;

	for (; idx < output->interleaved_packets.num; idx++) {
		struct encoder_packet *p =
			&output->interleaved_packets.array[idx];

		if (p->dts_usec >= dts_usec)
			break;
	}

	if (idx)
		discard_to_idx(output, idx);
}

static void interleave_packets(void *data, struct encoder_packet *packet)
{
	struct obs_output *output = data;
	struct encoder_packet out;
	bool was_started;

	if (!active(output))
		return;

	if (packet->type == OBS_ENCODER_AUDIO)
		packet->track_idx = get_track_index(output, packet);

	pthread_mutex_lock(&output->interleaved_mutex);

	/* if first video frame is not a keyframe, discard until received */
	if (!output->received_video && packet->type == OBS_ENCODER_VIDEO &&
	    !packet->keyframe) {
		discard_unused_audio_packets(output, packet->dts_usec);
		pthread_mutex_unlock(&output->interleaved_mutex);

		if (output->active_delay_ns)
			obs_encoder_packet_release(packet);
		return;
	}

	was_started = output->received_audio && output->received_video;

	if (output->active_delay_ns)
		out = *packet;
	else
		obs_encoder_packet_create_instance(&out, packet);

	if (was_started)
		apply_interleaved_packet_offset(output, &out);
	else
		check_received(output, packet);

	insert_interleaved_packet(output, &out);
	set_higher_ts(output, &out);

	/* when both video and audio have been received, we're ready
	 * to start sending out packets (one at a time) */
	if (output->received_audio && output->received_video) {
		if (!was_started) {
			if (prune_interleaved_packets(output)) {
				if (initialize_interleaved_packets(output)) {
					resort_interleaved_packets(output);
					send_interleaved(output);
				}
			}
		} else {
			send_interleaved(output);
		}
	}

	pthread_mutex_unlock(&output->interleaved_mutex);
}

static void default_encoded_callback(void *param, struct encoder_packet *packet)
{
	struct obs_output *output = param;

	if (data_active(output)) {
		if (packet->type == OBS_ENCODER_AUDIO)
			packet->track_idx = get_track_index(output, packet);

		output->info.encoded_packet(output->context.data, packet);

		if (packet->type == OBS_ENCODER_VIDEO)
			output->total_frames++;
	}

	if (output->active_delay_ns)
		obs_encoder_packet_release(packet);
}

static void default_raw_video_callback(void *param, struct video_data *frame)
{
	struct obs_output *output = param;

	if (video_pause_check(&output->pause, frame->timestamp))
		return;

	if (data_active(output))
		output->info.raw_video(output->context.data, frame);
	output->total_frames++;
}

static bool prepare_audio(struct obs_output *output,
			  const struct audio_data *old, struct audio_data *new)
{
	if (!output->video_start_ts) {
		pthread_mutex_lock(&output->pause.mutex);
		output->video_start_ts = output->pause.last_video_ts;
		pthread_mutex_unlock(&output->pause.mutex);
	}

	if (!output->video_start_ts)
		return false;

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

	*new = *old;

	if (old->timestamp < output->video_start_ts) {
		uint64_t duration = (uint64_t)old->frames * 1000000000 /
				    (uint64_t)output->sample_rate;
		uint64_t end_ts = (old->timestamp + duration);
		uint64_t cutoff;

		if (end_ts <= output->video_start_ts)
			return false;

		cutoff = output->video_start_ts - old->timestamp;
		new->timestamp += cutoff;

		cutoff = cutoff * (uint64_t)output->sample_rate / 1000000000;

		for (size_t i = 0; i < output->planes; i++)
			new->data[i] += output->audio_size *(uint32_t)cutoff;
		new->frames -= (uint32_t)cutoff;
	}

	return true;
}

static void default_raw_audio_callback(void *param, size_t mix_idx,
				       struct audio_data *in)
{
	struct obs_output *output = param;
	struct audio_data out;
	size_t frame_size_bytes;

	if (!data_active(output))
		return;

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

	if (!prepare_audio(output, in, &out))
		return;
	if (audio_pause_check(&output->pause, &out, output->sample_rate))
		return;
	if (!output->audio_start_ts) {
		output->audio_start_ts = out.timestamp;
	}

	frame_size_bytes = AUDIO_OUTPUT_FRAMES * output->audio_size;

	for (size_t i = 0; i < output->planes; i++)
		circlebuf_push_back(&output->audio_buffer[mix_idx][i],
				    out.data[i],
				    out.frames * output->audio_size);

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

	while (output->audio_buffer[mix_idx][0].size > frame_size_bytes) {
		for (size_t i = 0; i < output->planes; i++) {
			circlebuf_pop_front(&output->audio_buffer[mix_idx][i],
					    output->audio_data[i],
					    frame_size_bytes);
			out.data[i] = (uint8_t *)output->audio_data[i];
		}

		out.frames = AUDIO_OUTPUT_FRAMES;
		out.timestamp = output->audio_start_ts +
				audio_frames_to_ns(output->sample_rate,
						   output->total_audio_frames);

		pthread_mutex_lock(&output->pause.mutex);
		out.timestamp += output->pause.ts_offset;
		pthread_mutex_unlock(&output->pause.mutex);

		output->total_audio_frames += AUDIO_OUTPUT_FRAMES;

		if (output->info.raw_audio2)
			output->info.raw_audio2(output->context.data, mix_idx,
						&out);
		else
			output->info.raw_audio(output->context.data, &out);
	}
}

static inline void start_audio_encoders(struct obs_output *output,
					encoded_callback_t encoded_callback)
{
	size_t num_mixes = num_audio_mixes(output);

	for (size_t i = 0; i < num_mixes; i++) {
		obs_encoder_start(output->audio_encoders[i], encoded_callback,
				  output);
	}
}

static inline void start_raw_audio(obs_output_t *output)
{
	if (output->info.raw_audio2) {
		for (int idx = 0; idx < MAX_AUDIO_MIXES; idx++) {
			if ((output->mixer_mask & ((size_t)1 << idx)) != 0) {
				audio_output_connect(
					output->audio, idx,
					get_audio_conversion(output),
					default_raw_audio_callback, output);
			}
		}
	} else {
		audio_output_connect(output->audio, get_first_mixer(output),
				     get_audio_conversion(output),
				     default_raw_audio_callback, output);
	}
}

static void reset_packet_data(obs_output_t *output)
{
	output->received_audio = false;
	output->received_video = false;
	output->highest_audio_ts = 0;
	output->highest_video_ts = 0;
	output->video_offset = 0;

	for (size_t i = 0; i < MAX_AUDIO_MIXES; i++)
		output->audio_offsets[i] = 0;

	free_packets(output);
}

static inline bool preserve_active(struct obs_output *output)
{
	return (output->delay_flags & OBS_OUTPUT_DELAY_PRESERVE) != 0;
}

static void hook_data_capture(struct obs_output *output, bool encoded,
			      bool has_video, bool has_audio)
{
	encoded_callback_t encoded_callback;

	if (encoded) {
		pthread_mutex_lock(&output->interleaved_mutex);
		reset_packet_data(output);
		pthread_mutex_unlock(&output->interleaved_mutex);

		encoded_callback = (has_video && has_audio)
					   ? interleave_packets
					   : default_encoded_callback;

		if (output->delay_sec) {
			output->active_delay_ns =
				(uint64_t)output->delay_sec * 1000000000ULL;
			output->delay_cur_flags = output->delay_flags;
			output->delay_callback = encoded_callback;
			encoded_callback = process_delay;
			os_atomic_set_bool(&output->delay_active, true);

			blog(LOG_INFO,
			     "Output '%s': %" PRIu32 " second delay "
			     "active, preserve on disconnect is %s",
			     output->context.name, output->delay_sec,
			     preserve_active(output) ? "on" : "off");
		}

		if (has_audio)
			start_audio_encoders(output, encoded_callback);
		if (has_video)
			obs_encoder_start(output->video_encoder,
					  encoded_callback, output);
	} else {
		if (has_video)
			start_raw_video(output->video,
					get_video_conversion(output),
					default_raw_video_callback, output);
		if (has_audio)
			start_raw_audio(output);
	}
}

static inline void signal_start(struct obs_output *output)
{
	do_output_signal(output, "start");
}

static inline void signal_reconnect(struct obs_output *output)
{
	struct calldata params;
	uint8_t stack[128];

	calldata_init_fixed(&params, stack, sizeof(stack));
	calldata_set_int(&params, "timeout_sec",
			 output->reconnect_retry_cur_sec);
	calldata_set_ptr(&params, "output", output);
	signal_handler_signal(output->context.signals, "reconnect", &params);
}

static inline void signal_reconnect_success(struct obs_output *output)
{
	do_output_signal(output, "reconnect_success");
}

static inline void signal_stop(struct obs_output *output)
{
	struct calldata params;

	calldata_init(&params);
	calldata_set_string(&params, "last_error", output->last_error_message);
	calldata_set_int(&params, "code", output->stop_code);
	calldata_set_ptr(&params, "output", output);

	signal_handler_signal(output->context.signals, "stop", &params);

	calldata_free(&params);
}

static inline void convert_flags(const struct obs_output *output,
				 uint32_t flags, bool *encoded, bool *has_video,
				 bool *has_audio, bool *has_service)
{
	*encoded = (output->info.flags & OBS_OUTPUT_ENCODED) != 0;
	if (!flags)
		flags = output->info.flags;
	else
		flags &= output->info.flags;

	*has_video = (flags & OBS_OUTPUT_VIDEO) != 0;
	*has_audio = (flags & OBS_OUTPUT_AUDIO) != 0;
	*has_service = (flags & OBS_OUTPUT_SERVICE) != 0;
}

bool obs_output_can_begin_data_capture(const obs_output_t *output,
				       uint32_t flags)
{
	bool encoded, has_video, has_audio, has_service;

	if (!obs_output_valid(output, "obs_output_can_begin_data_capture"))
		return false;

	if (delay_active(output))
		return true;
	if (active(output))
		return false;

	if (data_capture_ending(output))
		pthread_join(output->end_data_capture_thread, NULL);

	convert_flags(output, flags, &encoded, &has_video, &has_audio,
		      &has_service);

	return can_begin_data_capture(output, encoded, has_video, has_audio,
				      has_service);
}

static inline bool initialize_audio_encoders(obs_output_t *output,
					     size_t num_mixes)
{
	for (size_t i = 0; i < num_mixes; i++) {
		if (!obs_encoder_initialize(output->audio_encoders[i])) {
			obs_output_set_last_error(
				output, obs_encoder_get_last_error(
						output->audio_encoders[i]));
			return false;
		}
	}

	return true;
}

static inline obs_encoder_t *find_inactive_audio_encoder(obs_output_t *output,
							 size_t num_mixes)
{
	for (size_t i = 0; i < num_mixes; i++) {
		struct obs_encoder *audio = output->audio_encoders[i];

		if (audio && !audio->active && !audio->paired_encoder)
			return audio;
	}

	return NULL;
}

static inline void pair_encoders(obs_output_t *output, size_t num_mixes)
{
	struct obs_encoder *video = output->video_encoder;
	struct obs_encoder *audio =
		find_inactive_audio_encoder(output, num_mixes);

	if (video && audio) {
		pthread_mutex_lock(&audio->init_mutex);
		pthread_mutex_lock(&video->init_mutex);

		if (!audio->active && !video->active &&
		    !video->paired_encoder && !audio->paired_encoder) {

			audio->wait_for_video = true;
			audio->paired_encoder = video;
			video->paired_encoder = audio;
		}

		pthread_mutex_unlock(&video->init_mutex);
		pthread_mutex_unlock(&audio->init_mutex);
	}
}

bool obs_output_initialize_encoders(obs_output_t *output, uint32_t flags)
{
	bool encoded, has_video, has_audio, has_service;
	size_t num_mixes = num_audio_mixes(output);

	if (!obs_output_valid(output, "obs_output_initialize_encoders"))
		return false;

	if (active(output))
		return delay_active(output);

	convert_flags(output, flags, &encoded, &has_video, &has_audio,
		      &has_service);

	if (!encoded)
		return false;
	if (has_video && !obs_encoder_initialize(output->video_encoder)) {
		obs_output_set_last_error(
			output,
			obs_encoder_get_last_error(output->video_encoder));
		return false;
	}
	if (has_audio && !initialize_audio_encoders(output, num_mixes))
		return false;

	return true;
}

static bool begin_delayed_capture(obs_output_t *output)
{
	if (delay_capturing(output))
		return false;

	pthread_mutex_lock(&output->interleaved_mutex);
	reset_packet_data(output);
	os_atomic_set_bool(&output->delay_capturing, true);
	pthread_mutex_unlock(&output->interleaved_mutex);

	if (reconnecting(output)) {
		signal_reconnect_success(output);
		os_atomic_set_bool(&output->reconnecting, false);
	} else {
		signal_start(output);
	}

	return true;
}

static void reset_raw_output(obs_output_t *output)
{
	clear_audio_buffers(output);

	if (output->audio) {
		const struct audio_output_info *aoi =
			audio_output_get_info(output->audio);
		struct audio_convert_info conv = output->audio_conversion;
		struct audio_convert_info info = {
			aoi->samples_per_sec,
			aoi->format,
			aoi->speakers,
		};

		if (output->audio_conversion_set) {
			if (conv.samples_per_sec)
				info.samples_per_sec = conv.samples_per_sec;
			if (conv.format != AUDIO_FORMAT_UNKNOWN)
				info.format = conv.format;
			if (conv.speakers != SPEAKERS_UNKNOWN)
				info.speakers = conv.speakers;
		}

		output->sample_rate = info.samples_per_sec;
		output->planes = get_audio_planes(info.format, info.speakers);
		output->total_audio_frames = 0;
		output->audio_size =
			get_audio_size(info.format, info.speakers, 1);
	}

	output->audio_start_ts = 0;
	output->video_start_ts = 0;

	pause_reset(&output->pause);
}

bool obs_output_begin_data_capture(obs_output_t *output, uint32_t flags)
{
	bool encoded, has_video, has_audio, has_service;
	size_t num_mixes;

	if (!obs_output_valid(output, "obs_output_begin_data_capture"))
		return false;

	if (delay_active(output))
		return begin_delayed_capture(output);
	if (active(output))
		return false;

	output->total_frames = 0;

	if ((output->info.flags & OBS_OUTPUT_ENCODED) == 0) {
		reset_raw_output(output);
	}

	convert_flags(output, flags, &encoded, &has_video, &has_audio,
		      &has_service);

	if (!can_begin_data_capture(output, encoded, has_video, has_audio,
				    has_service))
		return false;

	num_mixes = num_audio_mixes(output);
	if (has_video && has_audio)
		pair_encoders(output, num_mixes);

	os_atomic_set_bool(&output->data_active, true);
	hook_data_capture(output, encoded, has_video, has_audio);

	if (has_service)
		obs_service_activate(output->service);

	do_output_signal(output, "activate");
	os_atomic_set_bool(&output->active, true);

	if (reconnecting(output)) {
		signal_reconnect_success(output);
		os_atomic_set_bool(&output->reconnecting, false);

	} else if (delay_active(output)) {
		do_output_signal(output, "starting");

	} else {
		signal_start(output);
	}

	return true;
}

static inline void stop_audio_encoders(obs_output_t *output,
				       encoded_callback_t encoded_callback)
{
	size_t num_mixes = num_audio_mixes(output);

	for (size_t i = 0; i < num_mixes; i++) {
		obs_encoder_stop(output->audio_encoders[i], encoded_callback,
				 output);
	}
}

static inline void stop_raw_audio(obs_output_t *output)
{
	if (output->info.raw_audio2) {
		for (int idx = 0; idx < MAX_AUDIO_MIXES; idx++) {
			if ((output->mixer_mask & ((size_t)1 << idx)) != 0) {
				audio_output_disconnect(
					output->audio, idx,
					default_raw_audio_callback, output);
			}
		}
	} else {
		audio_output_disconnect(output->audio, get_first_mixer(output),
					default_raw_audio_callback, output);
	}
}

static void *end_data_capture_thread(void *data)
{
	bool encoded, has_video, has_audio, has_service;
	encoded_callback_t encoded_callback;
	obs_output_t *output = data;

	convert_flags(output, 0, &encoded, &has_video, &has_audio,
		      &has_service);

	if (encoded) {
		if (output->active_delay_ns)
			encoded_callback = process_delay;
		else
			encoded_callback = (has_video && has_audio)
						   ? interleave_packets
						   : default_encoded_callback;

		if (has_video)
			obs_encoder_stop(output->video_encoder,
					 encoded_callback, output);
		if (has_audio)
			stop_audio_encoders(output, encoded_callback);
	} else {
		if (has_video)
			stop_raw_video(output->video,
				       default_raw_video_callback, output);
		if (has_audio)
			stop_raw_audio(output);
	}

	if (has_service)
		obs_service_deactivate(output->service, false);

	if (output->active_delay_ns)
		obs_output_cleanup_delay(output);

	do_output_signal(output, "deactivate");
	os_atomic_set_bool(&output->active, false);
	os_event_signal(output->stopping_event);
	os_atomic_set_bool(&output->end_data_capture_thread_active, false);

	return NULL;
}

static void obs_output_end_data_capture_internal(obs_output_t *output,
						 bool signal)
{
	int ret;

	if (!obs_output_valid(output, "obs_output_end_data_capture"))
		return;

	if (!active(output) || !data_active(output)) {
		if (signal) {
			signal_stop(output);
			output->stop_code = OBS_OUTPUT_SUCCESS;
			os_event_signal(output->stopping_event);
		}
		return;
	}

	if (delay_active(output)) {
		os_atomic_set_bool(&output->delay_capturing, false);

		if (!os_atomic_load_long(&output->delay_restart_refs)) {
			os_atomic_set_bool(&output->delay_active, false);
		} else {
			os_event_signal(output->stopping_event);
			return;
		}
	}

	os_atomic_set_bool(&output->data_active, false);

	if (output->video)
		log_frame_info(output);

	if (data_capture_ending(output))
		pthread_join(output->end_data_capture_thread, NULL);

	os_atomic_set_bool(&output->end_data_capture_thread_active, true);
	ret = pthread_create(&output->end_data_capture_thread, NULL,
			     end_data_capture_thread, output);
	if (ret != 0) {
		blog(LOG_WARNING,
		     "Failed to create end_data_capture_thread "
		     "for output '%s'!",
		     output->context.name);
		end_data_capture_thread(output);
	}

	if (signal) {
		signal_stop(output);
		output->stop_code = OBS_OUTPUT_SUCCESS;
	}
}

void obs_output_end_data_capture(obs_output_t *output)
{
	obs_output_end_data_capture_internal(output, true);
}

static void *reconnect_thread(void *param)
{
	struct obs_output *output = param;
	unsigned long ms = output->reconnect_retry_cur_sec * 1000;

	output->reconnect_thread_active = true;

	if (os_event_timedwait(output->reconnect_stop_event, ms) == ETIMEDOUT)
		obs_output_actual_start(output);

	if (os_event_try(output->reconnect_stop_event) == EAGAIN)
		pthread_detach(output->reconnect_thread);
	else
		os_atomic_set_bool(&output->reconnecting, false);

	output->reconnect_thread_active = false;
	return NULL;
}

#define MAX_RETRY_SEC (15 * 60)

static void output_reconnect(struct obs_output *output)
{
	int ret;

	if (!reconnecting(output)) {
		output->reconnect_retry_cur_sec = output->reconnect_retry_sec;
		output->reconnect_retries = 0;
	}

	if (output->reconnect_retries >= output->reconnect_retry_max) {
		output->stop_code = OBS_OUTPUT_DISCONNECTED;
		os_atomic_set_bool(&output->reconnecting, false);
		if (delay_active(output))
			os_atomic_set_bool(&output->delay_active, false);
		obs_output_end_data_capture(output);
		return;
	}

	if (!reconnecting(output)) {
		os_atomic_set_bool(&output->reconnecting, true);
		os_event_reset(output->reconnect_stop_event);
	}

	if (output->reconnect_retries) {
		output->reconnect_retry_cur_sec *= 2;
		if (output->reconnect_retry_cur_sec > MAX_RETRY_SEC)
			output->reconnect_retry_cur_sec = MAX_RETRY_SEC;
	}

	output->reconnect_retries++;

	output->stop_code = OBS_OUTPUT_DISCONNECTED;
	ret = pthread_create(&output->reconnect_thread, NULL, &reconnect_thread,
			     output);
	if (ret < 0) {
		blog(LOG_WARNING, "Failed to create reconnect thread");
		os_atomic_set_bool(&output->reconnecting, false);
	} else {
		blog(LOG_INFO, "Output '%s':  Reconnecting in %d seconds..",
		     output->context.name, output->reconnect_retry_sec);

		signal_reconnect(output);
	}
}

static inline bool can_reconnect(const obs_output_t *output, int code)
{
	bool reconnect_active = output->reconnect_retry_max != 0;

	return (reconnecting(output) && code != OBS_OUTPUT_SUCCESS) ||
	       (reconnect_active && code == OBS_OUTPUT_DISCONNECTED);
}

void obs_output_signal_stop(obs_output_t *output, int code)
{
	if (!obs_output_valid(output, "obs_output_signal_stop"))
		return;

	output->stop_code = code;

	if (can_reconnect(output, code)) {
		if (delay_active(output))
			os_atomic_inc_long(&output->delay_restart_refs);
		obs_output_end_data_capture_internal(output, false);
		output_reconnect(output);
	} else {
		if (delay_active(output))
			os_atomic_set_bool(&output->delay_active, false);
		obs_output_end_data_capture(output);
	}
}

void obs_output_addref(obs_output_t *output)
{
	if (!output)
		return;

	obs_ref_addref(&output->control->ref);
}

void obs_output_release(obs_output_t *output)
{
	if (!output)
		return;

	obs_weak_output_t *control = output->control;
	if (obs_ref_release(&control->ref)) {
		// The order of operations is important here since
		// get_context_by_name in obs.c relies on weak refs
		// being alive while the context is listed
		obs_output_destroy(output);
		obs_weak_output_release(control);
	}
}

void obs_weak_output_addref(obs_weak_output_t *weak)
{
	if (!weak)
		return;

	obs_weak_ref_addref(&weak->ref);
}

void obs_weak_output_release(obs_weak_output_t *weak)
{
	if (!weak)
		return;

	if (obs_weak_ref_release(&weak->ref))
		bfree(weak);
}

obs_output_t *obs_output_get_ref(obs_output_t *output)
{
	if (!output)
		return NULL;

	return obs_weak_output_get_output(output->control);
}

obs_weak_output_t *obs_output_get_weak_output(obs_output_t *output)
{
	if (!output)
		return NULL;

	obs_weak_output_t *weak = output->control;
	obs_weak_output_addref(weak);
	return weak;
}

obs_output_t *obs_weak_output_get_output(obs_weak_output_t *weak)
{
	if (!weak)
		return NULL;

	if (obs_weak_ref_get_ref(&weak->ref))
		return weak->output;

	return NULL;
}

bool obs_weak_output_references_output(obs_weak_output_t *weak,
				       obs_output_t *output)
{
	return weak && output && weak->output == output;
}

void *obs_output_get_type_data(obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_get_type_data")
		       ? output->info.type_data
		       : NULL;
}

const char *obs_output_get_id(const obs_output_t *output)
{
	return obs_output_valid(output, "obs_output_get_id") ? output->info.id
							     : NULL;
}

#if BUILD_CAPTIONS
static struct caption_text *caption_text_new(const char *text, size_t bytes,
					     struct caption_text *tail,
					     struct caption_text **head,
					     double display_duration)
{
	struct caption_text *next = bzalloc(sizeof(struct caption_text));
	snprintf(&next->text[0], CAPTION_LINE_BYTES + 1, "%.*s", (int)bytes,
		 text);
	next->display_duration = display_duration;

	if (!*head) {
		*head = next;
	} else {
		tail->next = next;
	}

	return next;
}

void obs_output_output_caption_text1(obs_output_t *output, const char *text)
{
	if (!obs_output_valid(output, "obs_output_output_caption_text1"))
		return;
	obs_output_output_caption_text2(output, text, 2.0f);
}

void obs_output_output_caption_text2(obs_output_t *output, const char *text,
				     double display_duration)
{
	if (!obs_output_valid(output, "obs_output_output_caption_text2"))
		return;
	if (!active(output))
		return;

	// split text into 32 character strings
	int size = (int)strlen(text);
	blog(LOG_DEBUG, "Caption text: %s", text);

	pthread_mutex_lock(&output->caption_mutex);

	output->caption_tail =
		caption_text_new(text, size, output->caption_tail,
				 &output->caption_head, display_duration);

	pthread_mutex_unlock(&output->caption_mutex);
}
#endif

float obs_output_get_congestion(obs_output_t *output)
{
	if (!obs_output_valid(output, "obs_output_get_congestion"))
		return 0;

	if (output->info.get_congestion) {
		float val = output->info.get_congestion(output->context.data);
		if (val < 0.0f)
			val = 0.0f;
		else if (val > 1.0f)
			val = 1.0f;
		return val;
	}
	return 0;
}

int obs_output_get_connect_time_ms(obs_output_t *output)
{
	if (!obs_output_valid(output, "obs_output_get_connect_time_ms"))
		return -1;

	if (output->info.get_connect_time_ms)
		return output->info.get_connect_time_ms(output->context.data);
	return -1;
}

const char *obs_output_get_last_error(obs_output_t *output)
{
	if (!obs_output_valid(output, "obs_output_get_last_error"))
		return NULL;

	return output->last_error_message;
}

void obs_output_set_last_error(obs_output_t *output, const char *message)
{
	if (!obs_output_valid(output, "obs_output_set_last_error"))
		return;

	if (output->last_error_message)
		bfree(output->last_error_message);

	if (message)
		output->last_error_message = bstrdup(message);
	else
		output->last_error_message = NULL;
}

bool obs_output_reconnecting(const obs_output_t *output)
{
	if (!obs_output_valid(output, "obs_output_reconnecting"))
		return false;

	return reconnecting(output);
}

const char *obs_output_get_supported_video_codecs(const obs_output_t *output)
{
	return obs_output_valid(output, __FUNCTION__)
		       ? output->info.encoded_video_codecs
		       : NULL;
}

const char *obs_output_get_supported_audio_codecs(const obs_output_t *output)
{
	return obs_output_valid(output, __FUNCTION__)
		       ? output->info.encoded_audio_codecs
		       : NULL;
}