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/*
Copyright (C) 2012 Carl Hetherington <cth@carlh.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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** @file src/server.cc
* @brief Class to describe a server to which we can send
* encoding work, and a class to implement such a server.
*/
#include <string>
#include <vector>
#include <sstream>
#include <iostream>
#include <boost/algorithm/string.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/scoped_array.hpp>
#include "server.h"
#include "util.h"
#include "scaler.h"
#include "image.h"
#include "dcp_video_frame.h"
#include "config.h"
#include "subtitle.h"
#include "i18n.h"
using std::string;
using std::stringstream;
using std::multimap;
using std::vector;
using boost::shared_ptr;
using boost::algorithm::is_any_of;
using boost::algorithm::split;
using boost::thread;
using boost::bind;
using boost::scoped_array;
using libdcp::Size;
/** Create a server description from a string of metadata returned from as_metadata().
* @param v Metadata.
* @return ServerDescription, or 0.
*/
ServerDescription *
ServerDescription::create_from_metadata (string v)
{
vector<string> b;
split (b, v, is_any_of (N_(" ")));
if (b.size() != 2) {
return 0;
}
return new ServerDescription (b[0], atoi (b[1].c_str ()));
}
/** @return Description of this server as text */
string
ServerDescription::as_metadata () const
{
stringstream s;
s << _host_name << N_(" ") << _threads;
return s.str ();
}
Server::Server (Log* log)
: _log (log)
{
}
int
Server::process (shared_ptr<Socket> socket)
{
uint32_t length = socket->read_uint32 ();
scoped_array<char> buffer (new char[length]);
socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
stringstream s (buffer.get());
multimap<string, string> kv = read_key_value (s);
if (get_required_string (kv, N_("encode")) != N_("please")) {
return -1;
}
libdcp::Size in_size (get_required_int (kv, N_("input_width")), get_required_int (kv, N_("input_height")));
int pixel_format_int = get_required_int (kv, N_("input_pixel_format"));
libdcp::Size out_size (get_required_int (kv, N_("output_width")), get_required_int (kv, N_("output_height")));
int padding = get_required_int (kv, N_("padding"));
int subtitle_offset = get_required_int (kv, N_("subtitle_offset"));
float subtitle_scale = get_required_float (kv, N_("subtitle_scale"));
string scaler_id = get_required_string (kv, N_("scaler"));
int frame = get_required_int (kv, N_("frame"));
int frames_per_second = get_required_int (kv, N_("frames_per_second"));
string post_process = get_optional_string (kv, N_("post_process"));
int colour_lut_index = get_required_int (kv, N_("colour_lut"));
int j2k_bandwidth = get_required_int (kv, N_("j2k_bandwidth"));
Position subtitle_position (get_optional_int (kv, N_("subtitle_x")), get_optional_int (kv, N_("subtitle_y")));
libdcp::Size subtitle_size (get_optional_int (kv, N_("subtitle_width")), get_optional_int (kv, N_("subtitle_height")));
/* This checks that colour_lut_index is within range */
colour_lut_index_to_name (colour_lut_index);
PixelFormat pixel_format = (PixelFormat) pixel_format_int;
Scaler const * scaler = Scaler::from_id (scaler_id);
shared_ptr<Image> image (new SimpleImage (pixel_format, in_size, true));
image->read_from_socket (socket);
shared_ptr<Subtitle> sub;
if (subtitle_size.width && subtitle_size.height) {
shared_ptr<Image> subtitle_image (new SimpleImage (PIX_FMT_RGBA, subtitle_size, true));
subtitle_image->read_from_socket (socket);
sub.reset (new Subtitle (subtitle_position, subtitle_image));
}
DCPVideoFrame dcp_video_frame (
image, sub, out_size, padding, subtitle_offset, subtitle_scale,
scaler, frame, frames_per_second, post_process, colour_lut_index, j2k_bandwidth, _log
);
shared_ptr<EncodedData> encoded = dcp_video_frame.encode_locally ();
try {
encoded->send (socket);
} catch (std::exception& e) {
_log->log (String::compose (
N_("Send failed; frame %1, data size %2, pixel format %3, image size %4x%5, %6 components"),
frame, encoded->size(), image->pixel_format(), image->size().width, image->size().height, image->components()
)
);
throw;
}
return frame;
}
void
Server::worker_thread ()
{
while (1) {
boost::mutex::scoped_lock lock (_worker_mutex);
while (_queue.empty ()) {
_worker_condition.wait (lock);
}
shared_ptr<Socket> socket = _queue.front ();
_queue.pop_front ();
lock.unlock ();
int frame = -1;
struct timeval start;
gettimeofday (&start, 0);
try {
frame = process (socket);
} catch (std::exception& e) {
_log->log (String::compose (N_("Error: %1"), e.what()));
}
socket.reset ();
lock.lock ();
if (frame >= 0) {
struct timeval end;
gettimeofday (&end, 0);
_log->log (String::compose (N_("Encoded frame %1 in %2"), frame, seconds (end) - seconds (start)));
}
_worker_condition.notify_all ();
}
}
void
Server::run (int num_threads)
{
_log->log (String::compose (N_("Server starting with %1 threads"), num_threads));
for (int i = 0; i < num_threads; ++i) {
_worker_threads.push_back (new thread (bind (&Server::worker_thread, this)));
}
boost::asio::io_service io_service;
boost::asio::ip::tcp::acceptor acceptor (io_service, boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), Config::instance()->server_port ()));
while (1) {
shared_ptr<Socket> socket (new Socket);
acceptor.accept (socket->socket ());
boost::mutex::scoped_lock lock (_worker_mutex);
/* Wait until the queue has gone down a bit */
while (int (_queue.size()) >= num_threads * 2) {
_worker_condition.wait (lock);
}
_queue.push_back (socket);
_worker_condition.notify_all ();
}
}
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