obs-studio/libobs/obs-output.c

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

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/

#include <inttypes.h>
#include "util/platform.h"
#include "obs.h"
#include "obs-internal.h"

static inline void signal_stop(struct obs_output *output, int code);

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() : NULL;
}

static const char *output_signals[] = {
	"void start(ptr output)",
	"void stop(ptr output, int code)",
	"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)
{
	if (!obs_context_data_init(&output->context, settings, name))
		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)
{
	const struct obs_output_info *info = find_output(id);
	struct obs_output *output;
	int ret;

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

	output = bzalloc(sizeof(struct obs_output));
	pthread_mutex_init_value(&output->interleaved_mutex);

	if (pthread_mutex_init(&output->interleaved_mutex, NULL) != 0)
		goto fail;
	if (!init_output_handlers(output, name, settings))
		goto fail;

	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->context.data = info->create(output->context.settings, output);
	if (!output->context.data)
		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);

	blog(LOG_INFO, "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_free_encoder_packet(output->interleaved_packets.array+i);
	da_free(output->interleaved_packets);
}

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

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

		if (output->valid && output->active)
			obs_output_stop(output);
		if (output->service)
			output->service->output = NULL;

		free_packets(output);

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

		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);
			}
		}

		pthread_mutex_destroy(&output->interleaved_mutex);
		os_event_destroy(output->reconnect_stop_event);
		obs_context_data_free(&output->context);
		bfree(output);
	}
}

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

bool obs_output_start(obs_output_t *output)
{
	bool success;

	if (!output)
		return false;

	output->stopped = false;

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

	if (success && output->video) {
		output->starting_frame_count =
			video_output_get_total_frames(output->video);
		output->starting_skipped_frame_count =
			video_output_get_skipped_frames(output->video);
	}

	return success;
}

static void log_frame_info(struct obs_output *output)
{
	uint32_t video_frames  = video_output_get_total_frames(output->video);
	uint32_t video_skipped = video_output_get_skipped_frames(output->video);

	uint32_t total   = video_frames  - output->starting_frame_count;
	uint32_t skipped = video_skipped - output->starting_skipped_frame_count;

	int dropped = obs_output_get_frames_dropped(output);

	double percentage_skipped = (double)skipped / (double)total * 100.0;

	blog(LOG_INFO, "Output '%s': stopping", output->context.name);
	blog(LOG_INFO, "Output '%s': Total frames: %"PRIu32,
			output->context.name, total);

	if (total)
		blog(LOG_INFO, "Output '%s': Number of skipped frames: "
				"%"PRIu32" (%g%%)",
				output->context.name,
				skipped, percentage_skipped);

	if (dropped) {
		double percentage_dropped;
		percentage_dropped = (double)dropped / (double)total * 100.0;

		blog(LOG_INFO, "Output '%s': Number of dropped frames: "
				"%d (%g%%)",
				output->context.name,
				dropped, percentage_dropped);
	}
}

void obs_output_stop(obs_output_t *output)
{
	if (output) {
		output->stopped = true;

		os_event_signal(output->reconnect_stop_event);
		if (output->reconnect_thread_active)
			pthread_join(output->reconnect_thread, NULL);

		output->info.stop(output->context.data);
		signal_stop(output, OBS_OUTPUT_SUCCESS);

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

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

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 (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 (!output) 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 (!output)
		return NULL;

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

bool obs_output_canpause(const obs_output_t *output)
{
	return output ? (output->info.pause != NULL) : false;
}

void obs_output_pause(obs_output_t *output)
{
	if (output && output->info.pause)
		output->info.pause(output->context.data);
}

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

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

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

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

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

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

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

	if (!output->active)
		output->mixer_idx = mixer_idx;
}

size_t obs_output_get_mixer(const obs_output_t *output)
{
	return output ? output->mixer_idx : 0;
}

void obs_output_remove_encoder(struct obs_output *output,
		struct obs_encoder *encoder)
{
	if (!output) 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 (!output) return;
	if (output->video_encoder == encoder) return;
	if (encoder && encoder->info.type != OBS_ENCODER_VIDEO) 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 (!output) return;
	if (encoder && encoder->info.type != OBS_ENCODER_AUDIO) 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 output ? output->video_encoder : NULL;
}

obs_encoder_t *obs_output_get_audio_encoder(const obs_output_t *output,
		size_t idx)
{
	if (!output) 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 (!output || output->active || !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 output ? output->service : NULL;
}

void obs_output_set_reconnect_settings(obs_output_t *output,
		int retry_count, int retry_sec)
{
	if (!output) 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 (!output || !output->info.get_total_bytes)
		return 0;

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

int obs_output_get_frames_dropped(const obs_output_t *output)
{
	if (!output || !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 output ? output->total_frames : 0;
}

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

	if (output->active) {
		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 (!output || (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 (!output || (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 (!output || !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 (!output || !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;
}

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 timstamp in the interleave buffer.
	 * this ensures that the timestamps are monotonic */
	if (!has_higher_opposing_ts(output, &out))
		return;

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

	da_erase(output->interleaved_packets, 0);
	if (!output->stopped)
		output->info.encoded_packet(output->context.data, &out);
	obs_free_encoder_packet(&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 bool can_prune_interleaved_packet(struct obs_output *output, size_t idx)
{
	struct encoder_packet *packet;
	struct encoder_packet *next;

	if (idx >= (output->interleaved_packets.num - 1))
		return false;

	packet = &output->interleaved_packets.array[idx];

	/* audio packets will almost always come before video packets,
	 * so it should only ever be necessary to prune audio packets */
	if (packet->type != OBS_ENCODER_AUDIO)
		return false;

	next = &output->interleaved_packets.array[idx + 1];

	if (next->type == OBS_ENCODER_VIDEO &&
	    next->dts_usec == packet->dts_usec)
		return false;

	return true;
}

static void prune_interleaved_packets(struct obs_output *output)
{
	size_t start_idx = 0;

	while (can_prune_interleaved_packet(output, start_idx))
		start_idx++;

	if (start_idx) {
		for (size_t i = 0; i < start_idx; i++) {
			struct encoder_packet *packet =
				&output->interleaved_packets.array[i];
			obs_free_encoder_packet(packet);
		}

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

static struct encoder_packet *find_first_packet_type(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 packet;
		}
	}

	return NULL;
}

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

	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;
	}

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

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

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

	pthread_mutex_lock(&output->interleaved_mutex);

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

	obs_duplicate_encoder_packet(&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) {
			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 (packet->type == OBS_ENCODER_AUDIO)
		packet->track_idx = get_track_index(output, packet);

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

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

static void default_raw_video_callback(void *param, struct video_data *frame)
{
	struct obs_output *output = param;
	if (!output->stopped)
		output->info.raw_video(output->context.data, frame);
	output->total_frames++;
}

static void default_raw_audio_callback(void *param, size_t mix_idx,
		struct audio_data *frames)
{
	struct obs_output *output = param;
	if (!output->stopped)
		output->info.raw_audio(output->context.data, frames);

	UNUSED_PARAMETER(mix_idx);
}

typedef void (*encoded_callback_t)(void *data, struct encoder_packet *packet);

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

	if (encoded) {
		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[0] = 0;

		free_packets(output);

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

		if (has_video)
			obs_encoder_start(output->video_encoder,
					encoded_callback, output);
		if (has_audio)
			start_audio_encoders(output, encoded_callback);
	} else {
		if (has_video)
			video_output_connect(output->video,
					get_video_conversion(output),
					default_raw_video_callback, output);
		if (has_audio)
			audio_output_connect(output->audio, output->mixer_idx,
					get_audio_conversion(output),
					default_raw_audio_callback, output);
	}
}

static inline void do_output_signal(struct obs_output *output,
		const char *signal)
{
	struct calldata params = {0};
	calldata_set_ptr(&params, "output", output);
	signal_handler_signal(output->context.signals, signal, &params);
	calldata_free(&params);
}

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

static inline void signal_reconnect(struct obs_output *output)
{
	do_output_signal(output, "reconnect");
}

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, int code)
{
	struct calldata params = {0};
	calldata_set_int(&params, "code", 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 (!output) return false;
	if (output->active) return false;

	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])) {
			return false;
		}
	}

	return true;
}

static inline bool pair_encoders(obs_output_t *output, size_t num_mixes)
{
	if (num_mixes == 1 &&
	    !output->audio_encoders[0]->active &&
	    !output->video_encoder->active &&
	    !output->video_encoder->paired_encoder &&
	    !output->audio_encoders[0]->paired_encoder) {

		output->audio_encoders[0]->wait_for_video = true;
		output->audio_encoders[0]->paired_encoder =
			output->video_encoder;
		output->video_encoder->paired_encoder =
			output->audio_encoders[0];
	}

	return true;
}

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 (!output) return false;
	if (output->active) return false;

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

	if (!encoded)
		return false;
	if (has_service && !obs_service_initialize(output->service, output))
		return false;
	if (has_video && !obs_encoder_initialize(output->video_encoder))
		return false;
	if (has_audio && !initialize_audio_encoders(output, num_mixes))
		return false;

	if (has_video && has_audio) {
		if (!pair_encoders(output, num_mixes)) {
			return false;
		}
	}

	return true;
}

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

	if (!output) return false;
	if (output->active) return false;

	output->total_frames   = 0;

	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;

	hook_data_capture(output, encoded, has_video, has_audio);

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

	output->active = true;

	if (output->reconnecting) {
		signal_reconnect_success(output);
		output->reconnecting = false;
	} 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);
	}
}

void obs_output_end_data_capture(obs_output_t *output)
{
	bool encoded, has_video, has_audio, has_service;
	encoded_callback_t encoded_callback;

	if (!output) return;
	if (!output->active) return;

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

	if (encoded) {
		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)
			video_output_disconnect(output->video,
					default_raw_video_callback, output);
		if (has_audio)
			audio_output_disconnect(output->audio,
					output->mixer_idx,
					default_raw_audio_callback, output);
	}

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

	output->active = false;
}

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

	output->reconnect_thread_active = true;

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

	if (os_event_try(output->reconnect_stop_event) == EAGAIN)
		pthread_detach(output->reconnect_thread);

	output->reconnect_thread_active = false;
	return NULL;
}

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

	if (!output->reconnecting)
		output->reconnect_retries = 0;

	if (output->reconnect_retries >= output->reconnect_retry_max) {
		output->reconnecting = false;
		signal_stop(output, OBS_OUTPUT_DISCONNECTED);
		return;
	}

	if (!output->reconnecting) {
		output->reconnecting = true;
		os_event_reset(output->reconnect_stop_event);
	}

	output->reconnect_retries++;

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

		signal_reconnect(output);
	}
}

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

	obs_output_end_data_capture(output);
	if ((output->reconnecting && code != OBS_OUTPUT_SUCCESS) ||
	    code == OBS_OUTPUT_DISCONNECTED)
		output_reconnect(output);
	else
		signal_stop(output, code);
}

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;
}