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obs-output.c
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/******************************************************************************
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, obs_data_t *hotkey_data)
{
if (!obs_context_data_init(&output->context, settings, name,
hotkey_data))
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;
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, hotkey_data))
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)