Aegisub/src/threaded_frame_source.cpp

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// Copyright (c) 2013, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
/// @file threaded_frame_source.cpp
/// @see threaded_frame_source.h
/// @ingroup video
///
#include "threaded_frame_source.h"
#include "ass_dialogue.h"
#include "ass_file.h"
#include "export_fixstyle.h"
#include "include/aegisub/subtitles_provider.h"
#include "video_frame.h"
#include "video_provider_manager.h"
#include <libaegisub/dispatch.h>
#include <boost/range/adaptor/indirected.hpp>
#include <boost/range/algorithm_ext.hpp>
#include <condition_variable>
#include <functional>
#include <mutex>
enum {
NEW_SUBS_FILE = -1,
SUBS_FILE_ALREADY_LOADED = -2
};
std::shared_ptr<VideoFrame> ThreadedFrameSource::ProcFrame(int frame_number, double time, bool raw) {
std::shared_ptr<VideoFrame> frame;
try {
frame = video_provider->GetFrame(frame_number);
}
catch (VideoProviderError const& err) { throw VideoProviderErrorEvent(err); }
if (raw || !subs_provider || !subs) return frame;
try {
if (single_frame != frame_number && single_frame != SUBS_FILE_ALREADY_LOADED) {
// Generally edits and seeks come in groups; if the last thing done
// was seek it is more likely that the user will seek again and
// vice versa. As such, if this is the first frame requested after
// an edit, only export the currently visible lines (because the
// other lines will probably not be viewed before the file changes
// again), and if it's a different frame, export the entire file.
if (single_frame != NEW_SUBS_FILE) {
subs_provider->LoadSubtitles(subs.get());
single_frame = SUBS_FILE_ALREADY_LOADED;
}
else {
AssFixStylesFilter().ProcessSubs(subs.get(), nullptr);
single_frame = frame_number;
// Copying a nontrivially sized AssFile is fairly slow, so
// instead muck around with its innards to just temporarily
// remove the non-visible lines without deleting them
std::deque<AssEntry*> full;
for (auto& line : subs->Line)
full.push_back(&line);
subs->Line.remove_if([=](AssEntry const& e) -> bool {
const AssDialogue *diag = dynamic_cast<const AssDialogue*>(&e);
return diag && (diag->Start > time || diag->End <= time);
});
try {
subs_provider->LoadSubtitles(subs.get());
subs->Line.clear();
boost::push_back(subs->Line, full | boost::adaptors::indirected);
}
catch (...) {
subs->Line.clear();
boost::push_back(subs->Line, full | boost::adaptors::indirected);
throw;
}
}
}
}
catch (std::string const& err) { throw SubtitlesProviderErrorEvent(err); }
subs_provider->DrawSubtitles(*frame, time / 1000.);
return frame;
}
static std::unique_ptr<SubtitlesProvider> get_subs_provider(wxEvtHandler *parent) {
try {
return SubtitlesProviderFactory::GetProvider();
}
catch (std::string const& err) {
parent->AddPendingEvent(SubtitlesProviderErrorEvent(err));
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return nullptr;
}
}
ThreadedFrameSource::ThreadedFrameSource(agi::fs::path const& video_filename, std::string const& colormatrix, wxEvtHandler *parent)
: worker(agi::dispatch::Create())
, subs_provider(get_subs_provider(parent))
, video_provider(VideoProviderFactory::GetProvider(video_filename, colormatrix))
, parent(parent)
{
}
ThreadedFrameSource::~ThreadedFrameSource() {
// Block until all currently queued jobs are complete
worker->Sync([]{});
}
void ThreadedFrameSource::LoadSubtitles(const AssFile *new_subs) throw() {
uint_fast32_t req_version = ++version;
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auto copy = new AssFile(*new_subs);
worker->Async([=]{
subs.reset(copy);
single_frame = NEW_SUBS_FILE;
ProcAsync(req_version);
});
}
void ThreadedFrameSource::UpdateSubtitles(const AssFile *new_subs, std::set<const AssEntry*> const& changes) throw() {
uint_fast32_t req_version = ++version;
// Copy just the lines which were changed, then replace the lines at the
// same indices in the worker's copy of the file with the new entries
std::deque<std::pair<size_t, AssEntry*>> changed;
size_t i = 0;
for (auto const& e : new_subs->Line) {
if (changes.count(&e))
changed.emplace_back(i, e.Clone());
++i;
}
worker->Async([=]{
size_t i = 0;
auto it = subs->Line.begin();
for (auto& update : changed) {
advance(it, update.first - i);
i = update.first;
subs->Line.insert(it, *update.second);
delete &*it--;
}
single_frame = NEW_SUBS_FILE;
ProcAsync(req_version);
});
}
void ThreadedFrameSource::RequestFrame(int new_frame, double new_time) throw() {
uint_fast32_t req_version = ++version;
worker->Async([=]{
time = new_time;
frame_number = new_frame;
ProcAsync(req_version);
});
}
void ThreadedFrameSource::ProcAsync(uint_fast32_t req_version) {
// Only actually produce the frame if there's no queued changes waiting
if (req_version < version || frame_number < 0) return;
try {
FrameReadyEvent *evt = new FrameReadyEvent(ProcFrame(frame_number, time), time);
evt->SetEventType(EVT_FRAME_READY);
parent->QueueEvent(evt);
}
catch (wxEvent const& err) {
// Pass error back to parent thread
parent->QueueEvent(err.Clone());
}
}
std::shared_ptr<VideoFrame> ThreadedFrameSource::GetFrame(int frame, double time, bool raw) {
std::shared_ptr<VideoFrame> ret;
worker->Sync([&]{
ret = ProcFrame(frame, time, raw);
});
return ret;
}
wxDEFINE_EVENT(EVT_FRAME_READY, FrameReadyEvent);
wxDEFINE_EVENT(EVT_VIDEO_ERROR, VideoProviderErrorEvent);
wxDEFINE_EVENT(EVT_SUBTITLES_ERROR, SubtitlesProviderErrorEvent);
VideoProviderErrorEvent::VideoProviderErrorEvent(VideoProviderError const& err)
: agi::Exception(err.GetMessage(), &err)
{
SetEventType(EVT_VIDEO_ERROR);
}
SubtitlesProviderErrorEvent::SubtitlesProviderErrorEvent(std::string const& err)
: agi::Exception(err, nullptr)
{
SetEventType(EVT_SUBTITLES_ERROR);
}