Aegisub/src/async_video_provider.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/
#include "async_video_provider.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>
#if BOOST_VERSION >= 106900
#include <boost/gil.hpp>
#else
#include <boost/gil/gil_all.hpp>
#endif
enum {
NEW_SUBS_FILE = -1,
SUBS_FILE_ALREADY_LOADED = -2
};
std::shared_ptr<VideoFrame> AsyncVideoProvider::ProcFrame(int frame_number, double time, bool raw) {
// Find an unused buffer to use or allocate a new one if needed
std::shared_ptr<VideoFrame> frame;
for (auto& buffer : buffers) {
if (buffer.use_count() == 1) {
frame = buffer;
break;
}
}
if (!frame) {
frame = std::make_shared<VideoFrame>();
buffers.push_back(frame);
}
try {
source_provider->GetFrame(frame_number, *frame);
}
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());
single_frame = frame_number;
subs_provider->LoadSubtitles(subs.get(), time);
}
}
}
catch (agi::Exception const& err) { throw SubtitlesProviderErrorEvent(err.GetMessage()); }
try {
subs_provider->DrawSubtitles(*frame, time / 1000.);
}
catch (agi::UserCancelException const&) { }
return frame;
}
VideoFrame AsyncVideoProvider::GetBlankFrame(bool white) {
VideoFrame result;
result.width = GetWidth();
result.height = GetHeight();
result.pitch = result.width * 4;
result.flipped = false;
result.data.resize(result.pitch * result.height, white ? 255 : 0);
return result;
}
VideoFrame AsyncVideoProvider::GetSubtitles(double time) {
// We want to combine all transparent subtitle layers onto one layer.
// Instead of alpha blending them all together, which can be messy and cause
// rounding errors, we draw them once on a black frame and once on a white frame,
// and solve for the color and alpha. This has the benefit of being independent
// of the subtitle provider, as long as the provider works by alpha blending.
VideoFrame frame_black = GetBlankFrame(false);
if (!subs) return frame_black;
VideoFrame frame_white = GetBlankFrame(true);
subs_provider->LoadSubtitles(subs.get());
subs_provider->DrawSubtitles(frame_black, time / 1000.);
subs_provider->DrawSubtitles(frame_white, time / 1000.);
using namespace boost::gil;
auto blackview = interleaved_view(frame_black.width, frame_black.height, (bgra8_pixel_t*) frame_black.data.data(), frame_black.width * 4);
auto whiteview = interleaved_view(frame_white.width, frame_white.height, (bgra8_pixel_t*) frame_white.data.data(), frame_white.width * 4);
transform_pixels(blackview, whiteview, blackview, [=](const bgra8_pixel_t black, const bgra8_pixel_t white) -> bgra8_pixel_t {
int a = 255 - (white[0] - black[0]);
bgra8_pixel_t ret;
if (a == 0) {
ret[0] = 0;
ret[1] = 0;
ret[2] = 0;
ret[3] = 0;
} else {
ret[0] = black[0] / (a / 255.);
ret[1] = black[1] / (a / 255.);
ret[2] = black[2] / (a / 255.);
ret[3] = a;
}
return ret;
});
return frame_black;
}
static std::unique_ptr<SubtitlesProvider> get_subs_provider(wxEvtHandler *evt_handler, agi::BackgroundRunner *br) {
try {
return SubtitlesProviderFactory::GetProvider(br);
}
catch (agi::Exception const& err) {
evt_handler->AddPendingEvent(SubtitlesProviderErrorEvent(err.GetMessage()));
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return nullptr;
}
}
AsyncVideoProvider::AsyncVideoProvider(agi::fs::path const& video_filename, std::string const& colormatrix, wxEvtHandler *parent, agi::BackgroundRunner *br)
: worker(agi::dispatch::Create())
, subs_provider(get_subs_provider(parent, br))
, source_provider(VideoProviderFactory::GetProvider(video_filename, colormatrix, br))
, parent(parent)
{
}
AsyncVideoProvider::~AsyncVideoProvider() {
// Block until all currently queued jobs are complete
worker->Sync([]{});
}
void AsyncVideoProvider::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, false);
});
}
void AsyncVideoProvider::UpdateSubtitles(const AssFile *new_subs, const AssDialogue *changed) throw() {
uint_fast32_t req_version = ++version;
// Copy just the line which were changed, then replace the line at the
// same index in the worker's copy of the file with the new entry
auto copy = new AssDialogue(*changed);
worker->Async([=]{
int i = 0;
auto it = subs->Events.begin();
std::advance(it, copy->Row - i);
i = copy->Row;
subs->Events.insert(it, *copy);
delete &*it--;
single_frame = NEW_SUBS_FILE;
ProcAsync(req_version, true);
});
}
void AsyncVideoProvider::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, false);
});
}
bool AsyncVideoProvider::NeedUpdate(std::vector<AssDialogueBase const*> const& visible_lines) {
// Always need to render after a seek
if (single_frame != NEW_SUBS_FILE || frame_number != last_rendered)
return true;
// Obviously need to render if the number of visible lines has changed
if (visible_lines.size() != last_lines.size())
return true;
for (size_t i = 0; i < last_lines.size(); ++i) {
auto const& last = last_lines[i];
auto const& cur = *visible_lines[i];
if (last.Layer != cur.Layer) return true;
if (last.Margin != cur.Margin) return true;
if (last.Style != cur.Style) return true;
if (last.Effect != cur.Effect) return true;
if (last.Text != cur.Text) return true;
// Changing the start/end time effects the appearance only if the
// line is animated. This is obviously not a very accurate check for
// animated lines, but false positives aren't the end of the world
if ((last.Start != cur.Start || last.End != cur.End) &&
(!cur.Effect.get().empty() || cur.Text.get().find('\\') != std::string::npos))
return true;
}
return false;
}
void AsyncVideoProvider::ProcAsync(uint_fast32_t req_version, bool check_updated) {
// Only actually produce the frame if there's no queued changes waiting
if (req_version < version || frame_number < 0) return;
std::vector<AssDialogueBase const*> visible_lines;
for (auto const& line : subs->Events) {
if (!line.Comment && !(line.Start > time || line.End <= time))
visible_lines.push_back(&line);
}
if (check_updated && !NeedUpdate(visible_lines)) return;
last_lines.clear();
last_lines.reserve(visible_lines.size());
for (auto line : visible_lines)
last_lines.push_back(*line);
last_rendered = frame_number;
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> AsyncVideoProvider::GetFrame(int frame, double time, bool raw) {
std::shared_ptr<VideoFrame> ret;
worker->Sync([&]{ ret = ProcFrame(frame, time, raw); });
return ret;
}
void AsyncVideoProvider::SetColorSpace(std::string const& matrix) {
worker->Async([=] { source_provider->SetColorSpace(matrix); });
}
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())
{
SetEventType(EVT_VIDEO_ERROR);
}
SubtitlesProviderErrorEvent::SubtitlesProviderErrorEvent(std::string const& err)
: agi::Exception(err)
{
SetEventType(EVT_SUBTITLES_ERROR);
}