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// subtitleeditor -- a tool to create or edit subtitle
//
// https://subtitleeditor.github.io/subtitleeditor/
// https://github.com/subtitleeditor/subtitleeditor/
//
// Copyright @ 2005-2018, kitone
//
// 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 3 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 <cfg.h>
#include <gtkmm.h>
#include <keyframes.h>
#include <utility.h>
#include <iomanip>
#include <iostream>
#include "mediadecoder.h"
class KeyframesGeneratorUsingFrame : public Gtk::Dialog, public MediaDecoder {
public:
KeyframesGeneratorUsingFrame(const Glib::ustring& uri, Glib::RefPtr<KeyFrames>& keyframes)
: Gtk::Dialog(_("Generate Keyframes"), true), MediaDecoder(1000), m_duration(0), m_prev_frame_size(0), m_prev_frame(NULL), m_difference(0.2f) {
set_border_width(12);
set_default_size(300, -1);
get_vbox()->pack_start(m_progressbar, false, false);
add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
m_progressbar.set_show_text(true);
m_progressbar.set_text(_("Waiting..."));
show_all();
try {
read_config();
create_pipeline(uri);
if (run() == Gtk::RESPONSE_OK) {
keyframes = Glib::RefPtr<KeyFrames>(new KeyFrames);
keyframes->insert(keyframes->end(), m_values.begin(), m_values.end());
keyframes->set_video_uri(uri);
}
} catch (const std::runtime_error& ex) {
std::cerr << ex.what() << std::endl;
}
}
~KeyframesGeneratorUsingFrame(void) {
delete[] m_prev_frame;
}
void read_config() {
if (cfg::has_key("KeyframesGeneratorUsingFrame", "difference")) {
cfg::set_string("KeyframesGeneratorUsingFrame", "difference", "0.2");
cfg::set_comment("KeyframesGeneratorUsingFrame", "difference", "difference between frames as percent");
}
m_difference = cfg::get_float("KeyframesGeneratorUsingFrame", "difference");
}
static void static_handoff_callback(GstElement* fakesink, GstBuffer* buffer, GstPad* pad, gpointer data) {
KeyframesGeneratorUsingFrame* kfg = static_cast<KeyframesGeneratorUsingFrame*>(data);
kfg->on_video_identity_handoff(fakesink, buffer, pad);
}
// Check buffer and try to catch keyframes.
void on_video_identity_handoff(GstElement*, GstBuffer* buf, GstPad*) {
GstMapInfo map;
gst_buffer_map(GST_BUFFER(buf), &map, GST_MAP_READ);
// first frame or change of buffer size, alloc & push
if (!m_prev_frame || map.size != m_prev_frame_size) {
delete[] m_prev_frame;
m_prev_frame_size = map.size;
m_prev_frame = new guint8[m_prev_frame_size];
m_values.push_back(GST_BUFFER_PTS(buf) / GST_MSECOND);
} else if (compare_frame(m_prev_frame, map.data, map.size)) {
m_values.push_back(GST_BUFFER_PTS(buf) / GST_MSECOND);
}
// update the previous frame with this one
memcpy(m_prev_frame, map.data, map.size);
gst_buffer_unmap(GST_BUFFER(buf), &map);
}
bool compare_frame(const guint8* old_frame, const guint8* new_frame, gsize size) {
guint64 delta = 0;
guint64 full = size / 3;
gulong diff, i, j;
long tmp;
// calculate difference between frames
for (i = 0; i < full; ++i) {
diff = 0;
// get max difference in individual color channels
for (j = 0; j < 3; ++j) {
tmp = (int)new_frame[3 * i + j] - (int)old_frame[3 * i + j];
if (tmp < 0)
tmp = -tmp;
diff = tmp > diff ? tmp : diff;
}
// add max color diff to total delta
delta += diff;
}
full *= 255;
// >20% difference => scene cut
return ((double)delta / (double)full > m_difference);
}
// Create video bin
GstElement* create_element(const Glib::ustring& structure_name) {
// We only need and want create the video sink
if (structure_name.find("video") == Glib::ustring::npos)
return nullptr;
GstElement* fakesink = gst_element_factory_make("fakesink", NULL);
// fakesink->set_sync(false);
g_object_set(G_OBJECT(fakesink), "silent", TRUE, NULL);
g_object_set(G_OBJECT(fakesink), "signal-handoffs", TRUE, NULL);
g_signal_connect(fakesink, "handoff", G_CALLBACK(KeyframesGeneratorUsingFrame::static_handoff_callback), this);
// Set the new sink tp READY as well
GstStateChangeReturn retst = gst_element_set_state(fakesink, GST_STATE_READY);
if (retst == GST_STATE_CHANGE_FAILURE)
std::cerr << "Could not change state of new sink: " << retst << std::endl;
return fakesink;
}
// Update the progress bar
bool on_timeout() {
if (!m_pipeline)
return false;
gint64 pos = 0, len = 0;
if (gst_element_query_position(m_pipeline, GST_FORMAT_TIME, &pos) && gst_element_query_duration(m_pipeline, GST_FORMAT_TIME, &len)) {
double percent = static_cast<double>(pos) / static_cast<double>(len);
percent = CLAMP(percent, 0.0, 1.0);
m_progressbar.set_fraction(percent);
m_progressbar.set_text(time_to_string(pos) + " / " + time_to_string(len));
m_duration = len;
return pos != len;
}
return true;
}
void on_work_finished() {
response(Gtk::RESPONSE_OK);
}
void on_work_cancel() {
response(Gtk::RESPONSE_CANCEL);
}
protected:
Gtk::ProgressBar m_progressbar;
std::list<long> m_values;
guint64 m_duration;
guint64 m_prev_frame_size;
guint8* m_prev_frame;
gfloat m_difference;
};
Glib::RefPtr<KeyFrames> generate_keyframes_from_file_using_frame(const Glib::ustring& uri) {
Glib::RefPtr<KeyFrames> kf;
KeyframesGeneratorUsingFrame ui(uri, kf);
return kf;
}
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