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livetrax/gtk2_ardour/ardour_ui_aaf.cc

713 lines
22 KiB
C++

/*
* Copyright (C) 2023 Robin Gareus <robin@gareus.org>
* Copyright (C) 2023-2024 Adrien Gesta-Fline <dev.agfline@posteo.net>
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <fcntl.h> // O_WRONLY
#include <glib/gstdio.h> // g_unlink()
#include "pbd/basename.h"
#include "pbd/convert.h"
#include "pbd/file_utils.h"
#include "ardour/audio_track.h"
#include "ardour/audioengine.h"
#include "ardour/audioregion.h"
#include "ardour/filename_extensions.h"
#include "ardour/import_status.h"
#include "ardour/playlist.h"
#include "ardour/plugin_manager.h"
#include "ardour/region_factory.h"
#include "ardour/source_factory.h"
#include "ardour/utils.h"
#include "aaf/libaaf.h"
#include "aaf/utils.h"
#include "ardour_ui.h"
#include "public_editor.h"
#include "pbd/i18n.h"
using namespace std;
using namespace PBD;
using namespace ARDOUR;
static void
aaf_debug_callback (struct aafLog* log, void* ctxdata, int libid, int type, const char* srcfile, const char* srcfunc, int lineno, const char* msg, void* user)
{
const char* eol = "";
if (libid != LOG_SRC_ID_TRACE && libid != LOG_SRC_ID_DUMP) {
switch (type) {
case VERB_SUCCESS:
PBD::info << string_compose ("[libaaf] %1:%2 in %3(): ", srcfile, lineno, srcfunc);
break;
case VERB_ERROR:
PBD::error << string_compose ("[libaaf] %1:%2 in %3(): ", srcfile, lineno, srcfunc);
break;
case VERB_WARNING:
PBD::warning << string_compose ("[libaaf] %1:%2 in %3(): ", srcfile, lineno, srcfunc);
break;
// case VERB_DEBUG: PBD::debug << string_compose ("[libaaf] %1:%2 in %3(): ", srcfile, lineno, srcfunc); break;
}
}
if (libid != LOG_SRC_ID_DUMP) {
eol = "\n";
}
switch (type) {
case VERB_SUCCESS:
PBD::info << msg << eol;
break;
case VERB_ERROR:
PBD::error << msg << eol;
break;
case VERB_WARNING:
PBD::warning << msg << eol;
break;
// case VERB_DEBUG: PBD::debug << msg << eol; break;
}
LOG_BUFFER_RESET (log);
}
static std::shared_ptr<AudioTrack>
get_nth_audio_track (uint32_t nth, std::shared_ptr<RouteList const> routes)
{
RouteList rl = *(routes);
rl.sort (Stripable::Sorter ());
for (auto const& r : rl) {
std::shared_ptr<AudioTrack> at = std::dynamic_pointer_cast<AudioTrack> (r);
if (!at) {
continue;
}
if (nth-- == 0) {
return at;
}
}
return std::shared_ptr<AudioTrack> ();
}
static std::shared_ptr<AudioTrack>
prepare_audio_track (aafiAudioTrack* aafTrack, Session* s)
{
/* Use existing track */
std::shared_ptr<AudioTrack> track = get_nth_audio_track ((aafTrack->number - 1), s->get_routes ());
if (track) {
return track;
}
/* ..or create a new track */
uint32_t outputs = 2;
if (s->master_out ()) {
outputs = max (outputs, s->master_out ()->n_inputs ().n_audio ());
}
list<std::shared_ptr<AudioTrack>> at (s->new_audio_track (aafTrack->format, outputs, NULL, 1, aafTrack->name, PresentationInfo::max_order));
if (at.empty ()) {
PBD::fatal << "AAF: Could not create new audio track." << endmsg;
abort (); /*NOTREACHED*/
}
return at.back ();
}
static bool
import_sndfile_as_region (Session* s, struct aafiAudioEssencePointer* aafAudioEssencePtrList, SrcQuality quality, timepos_t& pos, SourceList** oneClipSources, ImportStatus& status, vector<std::shared_ptr<Region>>& regions)
{
SourceList* sources = NULL;
if (aafAudioEssencePtrList->user) {
sources = (SourceList*)aafAudioEssencePtrList->user;
} else {
sources = new SourceList;
/* Import the source */
status.clear ();
status.current = 1;
status.total = 1;
status.freeze = false;
status.quality = quality;
status.replace_existing_source = false;
status.split_midi_channels = false;
status.import_markers = false;
status.done = false;
status.cancel = false;
int channelCount = 0;
aafiAudioEssencePointer* aafAudioEssencePtr = NULL;
AAFI_foreachEssencePointer (aafAudioEssencePtrList, aafAudioEssencePtr)
{
if (aafAudioEssencePtr->essenceFile->usable_file_path)
status.paths.push_back (aafAudioEssencePtr->essenceFile->usable_file_path);
else
status.paths.push_back (aafAudioEssencePtr->essenceFile->original_file_path);
channelCount++;
PBD::info << string_compose ("AAF: Preparing to import clip channel %1: %2\n", channelCount, aafAudioEssencePtr->essenceFile->unique_name);
}
s->import_files (status);
status.progress = 1.0;
sources->clear ();
/* FIXME: There is no way to tell if cancel button was pressed
* or if the file failed to import, just that one of these occurred.
* We want status.cancel to reflect the user's choice only
*/
if (status.cancel && status.current > 1) {
/* Succeeded to import file, assume user hit cancel */
return false;
} else if (status.cancel && status.current == 1) {
/* Failed to import file, assume user did not hit cancel */
status.cancel = false;
return false;
}
for (int i = 0; i < channelCount; i++) {
PropertyList proplist;
sources->push_back (status.sources.at (i));
proplist.add (ARDOUR::Properties::start, 0);
proplist.add (ARDOUR::Properties::length, timecnt_t ((*sources)[0]->length (), pos));
proplist.add (ARDOUR::Properties::name, aafAudioEssencePtrList->essenceFile->unique_name);
proplist.add (ARDOUR::Properties::layer, 0);
proplist.add (ARDOUR::Properties::whole_file, true);
proplist.add (ARDOUR::Properties::external, true);
RegionFactory::create (*sources, proplist);
}
/* build peakfiles */
for (SourceList::iterator x = sources->begin (); x != sources->end (); ++x) {
SourceFactory::setup_peakfile (*x, true);
}
aafAudioEssencePtrList->user = sources;
}
*oneClipSources = sources;
/* Put the source on a region */
string region_name;
/* take all the sources we have and package them up as a region */
region_name = region_name_from_path (status.paths.front (), (sources->size () > 1), false);
/* we checked in import_sndfiles() that there were not too many */
while (RegionFactory::region_by_name (region_name)) {
region_name = bump_name_once (region_name, '.');
}
return true;
}
static std::shared_ptr<Region>
create_region (vector<std::shared_ptr<Region>> source_regions, aafiAudioClip* aafAudioClip, SourceList& oneClipSources, aafPosition_t clipOffset, aafRational_t samplerate_r)
{
string unique_file_name = aafAudioClip->essencePointerList->essenceFile->unique_name; // XXX
aafPosition_t clipPos = aafi_convertUnit (aafAudioClip->pos, aafAudioClip->track->edit_rate, &samplerate_r);
aafPosition_t clipLen = aafi_convertUnit (aafAudioClip->len, aafAudioClip->track->edit_rate, &samplerate_r);
aafPosition_t essenceOffset = aafi_convertUnit (aafAudioClip->essence_offset, aafAudioClip->track->edit_rate, &samplerate_r);
PropertyList proplist;
proplist.add (ARDOUR::Properties::start, essenceOffset);
proplist.add (ARDOUR::Properties::length, clipLen);
proplist.add (ARDOUR::Properties::name, unique_file_name);
proplist.add (ARDOUR::Properties::layer, 0);
proplist.add (ARDOUR::Properties::whole_file, false);
proplist.add (ARDOUR::Properties::external, true);
/* NOTE: region position is set when calling add_region() */
std::shared_ptr<Region> region = RegionFactory::create (oneClipSources, proplist);
for (SourceList::iterator source = oneClipSources.begin (); source != oneClipSources.end (); ++source) {
/* position displayed in Ardour source list */
(*source)->set_natural_position (timepos_t (clipPos + clipOffset));
for (vector<std::shared_ptr<Region>>::iterator region = source_regions.begin (); region != source_regions.end (); ++region) {
if ((*region)->source (0) == *source) {
/* Enable "Move to Original Position" */
(*region)->set_position (timepos_t (clipPos + clipOffset - essenceOffset));
}
}
}
return region;
}
static void
set_region_gain (aafiAudioClip* aafAudioClip, std::shared_ptr<Region> region, Session* s)
{
if (aafAudioClip->gain && aafAudioClip->gain->flags & AAFI_AUDIO_GAIN_CONSTANT) {
std::dynamic_pointer_cast<AudioRegion> (region)->set_scale_amplitude (aafRationalToFloat (aafAudioClip->gain->value[0]));
}
if (aafAudioClip->automation) {
aafiAudioGain* level = aafAudioClip->automation;
std::shared_ptr<AudioRegion> ar = std::dynamic_pointer_cast<AudioRegion> (region);
std::shared_ptr<AutomationList> al = ar->envelope ();
for (unsigned int i = 0; i < level->pts_cnt; ++i) {
al->fast_simple_add (timepos_t (aafRationalToFloat (level->time[i]) * region->length ().samples ()), aafRationalToFloat (level->value[i]));
}
}
}
static FadeShape
aaf_fade_interpol_to_ardour_fade_shape (aafiInterpolation_e interpol)
{
switch (interpol & AAFI_INTERPOL_MASK) {
case AAFI_INTERPOL_NONE:
return FadeConstantPower;
case AAFI_INTERPOL_LINEAR:
return FadeLinear;
case AAFI_INTERPOL_LOG:
return FadeConstantPower;
case AAFI_INTERPOL_CONSTANT:
return FadeConstantPower;
case AAFI_INTERPOL_POWER:
return FadeConstantPower;
case AAFI_INTERPOL_BSPLINE:
return FadeConstantPower;
default:
return FadeConstantPower;
}
}
static void
set_region_fade (aafiAudioClip* aafAudioClip, std::shared_ptr<Region> region, aafRational_t* samplerate)
{
if (aafAudioClip == NULL) {
return;
}
aafiTransition* fadein = aafi_getFadeIn (aafAudioClip);
aafiTransition* fadeout = aafi_getFadeOut (aafAudioClip);
aafiTransition* xfade = (aafAudioClip->timelineItem->prev) ? aafi_timelineItemToCrossFade (aafAudioClip->timelineItem->prev) : NULL;
if (xfade) {
if (fadein == NULL) {
fadein = xfade;
} else {
PBD::warning << "Clip has both fadein and crossfade : crossfade will be ignored." << endmsg;
}
}
FadeShape fade_shape;
samplecnt_t fade_len;
if (fadein != NULL) {
fade_shape = aaf_fade_interpol_to_ardour_fade_shape ((aafiInterpolation_e)(fadein->flags & AAFI_INTERPOL_MASK));
fade_len = aafi_convertUnit (fadein->len, aafAudioClip->track->edit_rate, samplerate);
std::dynamic_pointer_cast<AudioRegion> (region)->set_fade_in (fade_shape, fade_len);
}
if (fadeout != NULL) {
fade_shape = aaf_fade_interpol_to_ardour_fade_shape ((aafiInterpolation_e)(fadeout->flags & AAFI_INTERPOL_MASK));
fade_len = aafi_convertUnit (fadeout->len, aafAudioClip->track->edit_rate, samplerate);
std::dynamic_pointer_cast<AudioRegion> (region)->set_fade_out (fade_shape, fade_len);
}
}
static void
set_session_timecode (AAF_Iface* aafi, Session* s)
{
using namespace Timecode;
uint16_t aafFPS = aafi->Timecode->fps;
TimecodeFormat ardourtc;
/*
* Fractional timecodes are never explicitly set into tc->fps, so we deduce
* them based on edit_rate value.
*/
switch (aafFPS) {
case 24:
if (aafi->Timecode->edit_rate->numerator == 24000 &&
aafi->Timecode->edit_rate->denominator == 1001) {
ardourtc = timecode_23976;
} else {
ardourtc = timecode_24;
}
break;
case 25:
if (aafi->Timecode->edit_rate->numerator == 25000 &&
aafi->Timecode->edit_rate->denominator == 1001) {
ardourtc = timecode_24976;
} else {
ardourtc = timecode_25;
}
break;
case 30:
if (aafi->Timecode->edit_rate->numerator == 30000 &&
aafi->Timecode->edit_rate->denominator == 1001) {
if (aafi->Timecode->drop) {
ardourtc = timecode_2997drop;
} else {
ardourtc = timecode_2997;
}
} else {
if (aafi->Timecode->drop) {
ardourtc = timecode_30drop;
} else {
ardourtc = timecode_30;
}
}
break;
case 60:
if (aafi->Timecode->edit_rate->numerator == 60000 &&
aafi->Timecode->edit_rate->denominator == 1001) {
ardourtc = timecode_5994;
} else {
ardourtc = timecode_60;
}
break;
default:
PBD::error << string_compose ("Unknown AAF timecode fps : %1 (%2/%3).", aafFPS, aafi->Timecode->edit_rate->numerator, aafi->Timecode->edit_rate->denominator) << endmsg;
return;
}
s->config.set_timecode_format (ardourtc);
}
/* Create and open Sesssion from AAF
* return > 0 if file is not a [valid] AAF
* return < 0 if session creation failed.
* return 0 on success. path and snapshot are set.
*/
int
ARDOUR_UI::new_session_from_aaf (string const& aaf, string const& target_dir, string& path, string& snapshot)
{
if (PBD::downcase (aaf).find (advanced_authoring_format_suffix) == string::npos) {
return 1;
}
if (_session) {
if (unload_session (false)) {
/* unload cancelled by user */
return 1;
}
}
/* Possible libaaf log to external file : part 1/2 */
// string logfile = Glib::build_filename (g_get_tmp_dir (), "aaf-import-XXXXXX.log");
// int logfd = g_mkstemp_full (&logfile[0], O_WRONLY, 0700);
//
// fprintf(stderr, "Logfile: %s\n",&logfile[0] );
//
// if (logfd < 0) {
// error << _("AAF: Could not prepare log file") << endmsg;
// fprintf(stderr, "AAF: Could not prepare log file\n" );
// return -1;
// }
//
// FILE *logfp = fdopen( logfd, "w" );
//
// if (!logfp) {
// error << _("AAF: Could not prepare log file") << endmsg;
// fprintf(stderr, "AAF: Could not prepare log file\n" );
// return -1;
// }
AAF_Iface* aafi = aafi_alloc (NULL);
if (!aafi) {
error << "AAF: Could not init AAF library." << endmsg;
return -1;
}
/* protools options must be set (there is no sens not setting them with Ardour) */
uint32_t aaf_protools_options = (AAFI_PROTOOLS_OPT_REPLACE_CLIP_FADES | AAFI_PROTOOLS_OPT_REMOVE_SAMPLE_ACCURATE_EDIT);
aafi_set_option_int (aafi, "trace", 1);
aafi_set_option_int (aafi, "protools", aaf_protools_options);
// aafi_set_option_str (aafi, "media_location", media_location_path.c_str ());
aafi_set_debug (aafi, VERB_DEBUG, 0, NULL, &aaf_debug_callback, this);
if (aafi_load_file (aafi, aaf.c_str ())) {
error << "AAF: Could not load AAF file." << endmsg;
aafi_release (&aafi);
return -1;
}
snapshot = legalize_for_universal_path (basename_nosuffix (aaf));
path = Glib::build_filename (target_dir, snapshot);
if (Glib::file_test (path, Glib::FILE_TEST_EXISTS)) {
error << string_compose (_ ("AAF: Destination '%1' already exists."), path) << endmsg;
snapshot = ""; // XXX?
path = "";
aafi_release (&aafi);
return -1;
}
/* Create media cache */
GError* err = NULL;
char* td = g_dir_make_tmp ("aaf-cache-XXXXXX", &err);
if (!td) {
error << string_compose (_ ("AAF: Could not prepare media cache: %1"), err->message) << endmsg;
aafi_release (&aafi);
return -1;
}
const string media_cache_path = PBD::canonical_path (td);
g_free (td);
g_clear_error (&err);
/* all systems go. create sessions */
BusProfile bus_profile;
bus_profile.master_out_channels = 2;
aafRational_t samplerate_r;
samplerate_r.numerator = aafi->Audio->samplerate;
samplerate_r.denominator = 1;
std::string restore_backend;
if (!AudioEngine::instance ()->running ()) {
AudioEngine* e = AudioEngine::instance ();
restore_backend = e->current_backend_name ();
e->set_backend ("None (Dummy)", "", "");
e->start ();
PluginManager::instance ().refresh (true);
attach_to_engine ();
}
if (!AudioEngine::instance ()->running ()) {
PBD::error << _ ("AAF: Could not start [dummy] engine for AAF import .") << endmsg;
return -1;
}
build_session_stage_two (path, snapshot, "", bus_profile, false, Temporal::AudioTime, aafi->Audio->samplerate);
if (!_session) {
aafi_release (&aafi);
PBD::remove_directory (media_cache_path);
if (!restore_backend.empty ()) {
AudioEngine::instance ()->stop ();
AudioEngine::instance ()->set_backend (restore_backend, "", "");
}
error << _ ("AAF: Could not create new session for AAF import .") << endmsg;
return -1;
}
/* Possible libaaf log to external file : part 2/2
* Moving log file from temp/ to session/
*/
// string newlogfile = Glib::build_filename (path, "aaf-import.log");
//
// if (!PBD::copy_file (logfile, newlogfile)) {
// // if (g_rename (logfile.c_str(), newlogfile.c_str()) != 0) {
// error << string_compose (_("Could not copy logfile from \"%1\" to \"%2\": %3"),
// logfile, newlogfile, strerror (errno)) << endmsg;
// fprintf(stderr, "Could not copy logfile from \"%s\" to \"%s\": %s\n", logfile.c_str(), newlogfile.c_str(), strerror (errno) );
// } else {
// fprintf(stderr, "Copied logfile from \"%s\" to \"%s\"\n", logfile.c_str(), newlogfile.c_str() );
// g_unlink(logfile.c_str ());
// logfile = newlogfile;
// fprintf(stderr, "New logfile : \"%s\"\n", logfile.c_str() );
// }
switch (aafi->Audio->samplesize) {
case 16:
_session->config.set_native_file_data_format (ARDOUR::FormatInt16);
break;
case 24:
_session->config.set_native_file_data_format (ARDOUR::FormatInt24);
break;
case 32:
_session->config.set_native_file_data_format (ARDOUR::FormatFloat);
break;
default:
break;
}
/* Import Sources */
SourceList* oneClipSources;
ARDOUR::ImportStatus import_status;
vector<std::shared_ptr<Region>> source_regions;
timepos_t pos = timepos_t::max (Temporal::AudioTime);
aafiAudioTrack* aafAudioTrack = NULL;
aafiTimelineItem* aafAudioItem = NULL;
aafiAudioClip* aafAudioClip = NULL;
aafiAudioEssencePointer* aafAudioEssencePtr = NULL;
aafPosition_t sessionStart = aafi_convertUnit (aafi->compositionStart, aafi->compositionStart_editRate, &samplerate_r);
AAFI_foreachAudioTrack (aafi, aafAudioTrack)
{
std::shared_ptr<AudioTrack> track = prepare_audio_track (aafAudioTrack, _session);
AAFI_foreachTrackItem (aafAudioTrack, aafAudioItem)
{
aafAudioClip = aafi_timelineItemToAudioClip (aafAudioItem);
if (!aafAudioClip) {
continue;
}
if (aafAudioClip->essencePointerList == NULL) {
error << _ ("AAF: Clip has no essence.") << endmsg;
continue;
}
int essenceError = 0;
char* essenceName = aafAudioClip->essencePointerList->essenceFile->name;
AAFI_foreachEssencePointer (aafAudioClip->essencePointerList, aafAudioEssencePtr)
{
struct aafiAudioEssenceFile* audioEssenceFile = aafAudioEssencePtr->essenceFile;
if (!audioEssenceFile) {
PBD::error << string_compose (_ ("AAF: Could not create new region for clip '%1': Missing audio essence"), audioEssenceFile->unique_name) << endmsg;
essenceError++;
continue;
}
if (audioEssenceFile->is_embedded) {
if (aafi_extractAudioEssenceFile (aafi, audioEssenceFile, AAFI_EXTRACT_DEFAULT, media_cache_path.c_str (), 0, 0, NULL, NULL) < 0) {
PBD::error << string_compose ("AAF: Could not extract audio file '%1' from AAF.", audioEssenceFile->unique_name) << endmsg;
essenceError++;
continue;
}
} else if (!audioEssenceFile->is_embedded && !audioEssenceFile->usable_file_path) {
PBD::error << string_compose ("AAF: Could not locate external audio file: '%1'", audioEssenceFile->original_file_path) << endmsg;
essenceError++;
continue;
}
}
if (essenceError) {
PBD::error << string_compose ("AAF: Error parsing audio essence pointerlist : %1\n", essenceName);
continue;
}
if (!import_sndfile_as_region (_session, aafAudioClip->essencePointerList, SrcBest, pos, &oneClipSources, import_status, source_regions)) {
PBD::error << string_compose ("AAF: Could not import '%1' to session.", essenceName) << endmsg;
continue;
} else {
AAFI_foreachEssencePointer (aafAudioClip->essencePointerList, aafAudioEssencePtr)
{
if (aafAudioEssencePtr->essenceFile->is_embedded) {
g_unlink (aafAudioEssencePtr->essenceFile->usable_file_path);
}
}
}
if (!oneClipSources || oneClipSources->size () == 0) {
error << string_compose (_ ("AAF: Could not create new region for clip '%1': Region has no source"), essenceName) << endmsg;
continue;
}
std::shared_ptr<Region> region = create_region (source_regions, aafAudioClip, *oneClipSources, sessionStart, samplerate_r);
if (!region) {
error << string_compose (_ ("AAF: Could not create new region for clip '%1'"), essenceName) << endmsg;
continue;
}
/* converts whatever edit_rate clip is in, to samples */
aafPosition_t clipPos = aafi_convertUnit (aafAudioClip->pos, aafAudioClip->track->edit_rate, &samplerate_r);
track->playlist ()->add_region (region, timepos_t (clipPos + sessionStart));
set_region_gain (aafAudioClip, region, _session);
set_region_fade (aafAudioClip, region, &samplerate_r);
if (aafAudioClip->mute) {
region->set_muted (true);
}
}
}
// oneClipSources.clear ();
aafiMarker* marker = NULL;
AAFI_foreachMarker (aafi, marker)
{
aafPosition_t markerStart = sessionStart + aafi_convertUnit (marker->start, marker->edit_rate, &samplerate_r);
aafPosition_t markerEnd = sessionStart + aafi_convertUnit ((marker->start + marker->length), marker->edit_rate, &samplerate_r);
Location* location;
if (marker->length == 0) {
location = new Location (*_session, timepos_t (markerStart), timepos_t (markerStart), marker->name, Location::Flags (Location::IsMark));
} else {
location = new Location (*_session, timepos_t (markerStart), timepos_t (markerEnd), marker->name, Location::Flags (Location::IsRangeMarker));
}
_session->locations ()->add (location, true);
}
/* set session range */
aafRational_t nominal_sample_rate;
nominal_sample_rate.numerator = _session->nominal_sample_rate ();
nominal_sample_rate.denominator = 1;
samplepos_t start = samplepos_t (aafi_convertUnit (aafi->compositionStart, aafi->compositionStart_editRate, &nominal_sample_rate));
samplepos_t end = samplepos_t (aafi_convertUnit (aafi->compositionLength, aafi->compositionLength_editRate, &nominal_sample_rate)) + start;
_session->maybe_update_session_range (timepos_t (start), timepos_t (end));
/* set timecode */
set_session_timecode (aafi, _session);
the_editor ().access_action ("Editor", "zoom-to-session");
/* Cleanup */
import_status.progress = 1.0;
import_status.done = true;
import_status.sources.clear ();
import_status.all_done = true;
_session->save_state ("");
source_regions.clear ();
PBD::remove_directory (media_cache_path);
aafi_release (&aafi);
if (!restore_backend.empty ()) {
AudioEngine::instance ()->stop ();
AudioEngine::instance ()->set_backend (restore_backend, "", "");
}
return 0;
}