2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
3 Copyright (C) 2000-2007 Paul Davis
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 /** @file src/lib/util.cc
22 * @brief Some utility functions and classes.
30 #ifdef DVDOMATIC_POSIX
34 #include <libssh/libssh.h>
36 #include <boost/algorithm/string.hpp>
37 #include <boost/bind.hpp>
38 #include <boost/lambda/lambda.hpp>
39 #include <boost/lexical_cast.hpp>
40 #include <boost/thread.hpp>
41 #include <boost/filesystem.hpp>
43 #include <openssl/md5.h>
44 #include <magick/MagickCore.h>
45 #include <magick/version.h>
46 #include <libdcp/version.h>
48 #include <libavcodec/avcodec.h>
49 #include <libavformat/avformat.h>
50 #include <libswscale/swscale.h>
51 #include <libavfilter/avfiltergraph.h>
52 #include <libpostproc/postprocess.h>
53 #include <libavutil/pixfmt.h>
56 #include "exceptions.h"
59 #include "dcp_content_type.h"
61 #include "sound_processor.h"
67 using std::stringstream;
81 using std::numeric_limits;
83 using boost::shared_ptr;
85 using boost::lexical_cast;
90 /** Convert some number of seconds to a string representation
91 * in hours, minutes and seconds.
94 * @return String of the form H:M:S (where H is hours, M
95 * is minutes and S is seconds).
98 seconds_to_hms (int s)
108 hms << setfill ('0') << m << N_(":");
110 hms << setfill ('0') << s;
115 /** @param s Number of seconds.
116 * @return String containing an approximate description of s (e.g. "about 2 hours")
119 seconds_to_approximate_hms (int s)
130 ap << (h + 1) << N_(" ") << _("hours");
133 ap << N_("1 ") << _("hour");
135 ap << h << N_(" ") << _("hours");
140 ap << N_("1 ") << _("minute");
142 ap << m << N_(" ") << _("minutes");
145 ap << s << N_(" ") << _("seconds");
151 #ifdef DVDOMATIC_POSIX
152 /** @param l Mangled C++ identifier.
153 * @return Demangled version.
158 string::size_type const b = l.find_first_of (N_("("));
159 if (b == string::npos) {
163 string::size_type const p = l.find_last_of (N_("+"));
164 if (p == string::npos) {
172 string const fn = l.substr (b + 1, p - b - 1);
177 char* realname = abi::__cxa_demangle (fn.c_str(), 0, 0, &status);
182 } catch (std::exception) {
189 /** Write a stacktrace to an ostream.
190 * @param out Stream to write to.
191 * @param levels Number of levels to go up the call stack.
194 stacktrace (ostream& out, int levels)
201 size = backtrace (array, 200);
202 strings = backtrace_symbols (array, size);
205 for (i = 0; i < size && (levels == 0 || i < size_t(levels)); i++) {
206 out << N_(" ") << demangle (strings[i]) << endl;
214 /** @param v Version as used by FFmpeg.
215 * @return A string representation of v.
218 ffmpeg_version_to_string (int v)
221 s << ((v & 0xff0000) >> 16) << N_(".") << ((v & 0xff00) >> 8) << N_(".") << (v & 0xff);
225 /** Return a user-readable string summarising the versions of our dependencies */
227 dependency_version_summary ()
230 s << N_("libopenjpeg ") << opj_version () << N_(", ")
231 << N_("libavcodec ") << ffmpeg_version_to_string (avcodec_version()) << N_(", ")
232 << N_("libavfilter ") << ffmpeg_version_to_string (avfilter_version()) << N_(", ")
233 << N_("libavformat ") << ffmpeg_version_to_string (avformat_version()) << N_(", ")
234 << N_("libavutil ") << ffmpeg_version_to_string (avutil_version()) << N_(", ")
235 << N_("libpostproc ") << ffmpeg_version_to_string (postproc_version()) << N_(", ")
236 << N_("libswscale ") << ffmpeg_version_to_string (swscale_version()) << N_(", ")
237 << MagickVersion << N_(", ")
238 << N_("libssh ") << ssh_version (0) << N_(", ")
239 << N_("libdcp ") << libdcp::version << N_(" git ") << libdcp::git_commit;
245 seconds (struct timeval t)
247 return t.tv_sec + (double (t.tv_usec) / 1e6);
250 /** Call the required functions to set up DVD-o-matic's static arrays, etc.
251 * Must be called from the UI thread, if there is one.
256 avfilter_register_all ();
258 Format::setup_formats ();
259 DCPContentType::setup_dcp_content_types ();
260 Scaler::setup_scalers ();
261 Filter::setup_filters ();
262 SoundProcessor::setup_sound_processors ();
264 ui_thread = boost::this_thread::get_id ();
267 #ifdef DVDOMATIC_WINDOWS
268 boost::filesystem::path
272 GetModuleFileName (0, buffer, 512 * sizeof(wchar_t));
273 boost::filesystem::path p (buffer);
274 p = p.parent_path ();
275 p = p.parent_path ();
282 dvdomatic_setup_i18n (string lang)
284 #ifdef DVDOMATIC_POSIX
288 if (!lang.empty ()) {
289 /* Override our environment language; this is essential on
293 snprintf (cmd, sizeof(cmd), "LANGUAGE=%s", lang.c_str ());
295 snprintf (cmd, sizeof(cmd), "LANG=%s", lang.c_str ());
299 setlocale (LC_ALL, "");
300 textdomain ("libdvdomatic");
302 #ifdef DVDOMATIC_WINDOWS
303 bindtextdomain ("libdvdomatic", mo_path().string().c_str());
306 #ifdef DVDOMATIC_POSIX
307 bindtextdomain ("libdvdomatic", POSIX_LOCALE_PREFIX);
311 /** @param start Start position for the crop within the image.
312 * @param size Size of the cropped area.
313 * @return FFmpeg crop filter string.
316 crop_string (Position start, libdcp::Size size)
319 s << N_("crop=") << size.width << N_(":") << size.height << N_(":") << start.x << N_(":") << start.y;
323 /** @param s A string.
324 * @return Parts of the string split at spaces, except when a space is within quotation marks.
327 split_at_spaces_considering_quotes (string s)
330 bool in_quotes = false;
332 for (string::size_type i = 0; i < s.length(); ++i) {
333 if (s[i] == ' ' && !in_quotes) {
336 } else if (s[i] == '"') {
337 in_quotes = !in_quotes;
348 md5_digest (void const * data, int size)
351 MD5_Init (&md5_context);
352 MD5_Update (&md5_context, data, size);
353 unsigned char digest[MD5_DIGEST_LENGTH];
354 MD5_Final (digest, &md5_context);
357 for (int i = 0; i < MD5_DIGEST_LENGTH; ++i) {
358 s << hex << setfill('0') << setw(2) << ((int) digest[i]);
364 /** @param file File name.
365 * @return MD5 digest of file's contents.
368 md5_digest (boost::filesystem::path file)
370 ifstream f (file.string().c_str(), ios::binary);
372 throw OpenFileError (file.string());
375 f.seekg (0, ios::end);
376 int bytes = f.tellg ();
377 f.seekg (0, ios::beg);
379 int const buffer_size = 64 * 1024;
380 char buffer[buffer_size];
383 MD5_Init (&md5_context);
385 int const t = min (bytes, buffer_size);
387 MD5_Update (&md5_context, buffer, t);
391 unsigned char digest[MD5_DIGEST_LENGTH];
392 MD5_Final (digest, &md5_context);
395 for (int i = 0; i < MD5_DIGEST_LENGTH; ++i) {
396 s << hex << setfill('0') << setw(2) << ((int) digest[i]);
403 about_equal (float a, float b)
405 /* A film of F seconds at f FPS will be Ff frames;
406 Consider some delta FPS d, so if we run the same
407 film at (f + d) FPS it will last F(f + d) seconds.
409 Hence the difference in length over the length of the film will
410 be F(f + d) - Ff frames
411 = Ff + Fd - Ff frames
415 So if we accept a difference of 1 frame, ie 1/f seconds, we can
422 So for a 3hr film, ie F = 3 * 60 * 60 = 10800, the acceptable
423 FPS error is 1/F ~= 0.0001 ~= 10-e4
426 return (fabs (a - b) < 1e-4);
429 class FrameRateCandidate
432 FrameRateCandidate (float source_, int dcp_)
442 best_dcp_frame_rate (float source_fps)
444 list<int> const allowed_dcp_frame_rates = Config::instance()->allowed_dcp_frame_rates ();
446 /* Work out what rates we could manage, including those achieved by using skip / repeat. */
447 list<FrameRateCandidate> candidates;
449 /* Start with the ones without skip / repeat so they will get matched in preference to skipped/repeated ones */
450 for (list<int>::const_iterator i = allowed_dcp_frame_rates.begin(); i != allowed_dcp_frame_rates.end(); ++i) {
451 candidates.push_back (FrameRateCandidate (*i, *i));
454 /* Then the skip/repeat ones */
455 for (list<int>::const_iterator i = allowed_dcp_frame_rates.begin(); i != allowed_dcp_frame_rates.end(); ++i) {
456 candidates.push_back (FrameRateCandidate (float (*i) / 2, *i));
457 candidates.push_back (FrameRateCandidate (float (*i) * 2, *i));
460 /* Pick the best one, bailing early if we hit an exact match */
461 float error = numeric_limits<float>::max ();
462 boost::optional<FrameRateCandidate> best;
463 list<FrameRateCandidate>::iterator i = candidates.begin();
464 while (i != candidates.end()) {
466 if (about_equal (i->source, source_fps)) {
471 float const e = fabs (i->source - source_fps);
484 /** @param An arbitrary sampling rate.
485 * @return The appropriate DCP-approved sampling rate (48kHz or 96kHz).
488 dcp_audio_sample_rate (int fs)
497 /** @param index Colour LUT index.
498 * @return Human-readable name.
501 colour_lut_index_to_name (int index)
514 Socket::Socket (int timeout)
515 : _deadline (_io_service)
516 , _socket (_io_service)
519 _deadline.expires_at (boost::posix_time::pos_infin);
526 if (_deadline.expires_at() <= boost::asio::deadline_timer::traits_type::now ()) {
528 _deadline.expires_at (boost::posix_time::pos_infin);
531 _deadline.async_wait (boost::bind (&Socket::check, this));
534 /** Blocking connect.
535 * @param endpoint End-point to connect to.
538 Socket::connect (boost::asio::ip::basic_resolver_entry<boost::asio::ip::tcp> const & endpoint)
540 _deadline.expires_from_now (boost::posix_time::seconds (_timeout));
541 boost::system::error_code ec = boost::asio::error::would_block;
542 _socket.async_connect (endpoint, boost::lambda::var(ec) = boost::lambda::_1);
544 _io_service.run_one();
545 } while (ec == boost::asio::error::would_block);
547 if (ec || !_socket.is_open ()) {
548 throw NetworkError (_("connect timed out"));
553 * @param data Buffer to write.
554 * @param size Number of bytes to write.
557 Socket::write (uint8_t const * data, int size)
559 _deadline.expires_from_now (boost::posix_time::seconds (_timeout));
560 boost::system::error_code ec = boost::asio::error::would_block;
562 boost::asio::async_write (_socket, boost::asio::buffer (data, size), boost::lambda::var(ec) = boost::lambda::_1);
565 _io_service.run_one ();
566 } while (ec == boost::asio::error::would_block);
569 throw NetworkError (ec.message ());
574 Socket::write (uint32_t v)
577 write (reinterpret_cast<uint8_t*> (&v), 4);
581 * @param data Buffer to read to.
582 * @param size Number of bytes to read.
585 Socket::read (uint8_t* data, int size)
587 _deadline.expires_from_now (boost::posix_time::seconds (_timeout));
588 boost::system::error_code ec = boost::asio::error::would_block;
590 boost::asio::async_read (_socket, boost::asio::buffer (data, size), boost::lambda::var(ec) = boost::lambda::_1);
593 _io_service.run_one ();
594 } while (ec == boost::asio::error::would_block);
597 throw NetworkError (ec.message ());
602 Socket::read_uint32 ()
605 read (reinterpret_cast<uint8_t *> (&v), 4);
609 /** @param other A Rect.
610 * @return The intersection of this with `other'.
613 Rect::intersection (Rect const & other) const
615 int const tx = max (x, other.x);
616 int const ty = max (y, other.y);
620 min (x + width, other.x + other.width) - tx,
621 min (y + height, other.y + other.height) - ty
625 /** Round a number up to the nearest multiple of another number.
627 * @param s Array of numbers to round, indexed by c.
628 * @param t Multiple to round to.
629 * @return Rounded number.
632 stride_round_up (int c, int const * stride, int t)
634 int const a = stride[c] + (t - 1);
639 stride_lookup (int c, int const * stride)
644 /** Read a sequence of key / value pairs from a text stream;
645 * the keys are the first words on the line, and the values are
646 * the remainder of the line following the key. Lines beginning
647 * with # are ignored.
648 * @param s Stream to read.
649 * @return key/value pairs.
651 multimap<string, string>
652 read_key_value (istream &s)
654 multimap<string, string> kv;
657 while (getline (s, line)) {
662 if (line[0] == '#') {
666 if (line[line.size() - 1] == '\r') {
667 line = line.substr (0, line.size() - 1);
670 size_t const s = line.find (' ');
671 if (s == string::npos) {
675 kv.insert (make_pair (line.substr (0, s), line.substr (s + 1)));
682 get_required_string (multimap<string, string> const & kv, string k)
684 if (kv.count (k) > 1) {
685 throw StringError (N_("unexpected multiple keys in key-value set"));
688 multimap<string, string>::const_iterator i = kv.find (k);
690 if (i == kv.end ()) {
691 throw StringError (String::compose (_("missing key %1 in key-value set"), k));
698 get_required_int (multimap<string, string> const & kv, string k)
700 string const v = get_required_string (kv, k);
701 return lexical_cast<int> (v);
705 get_required_float (multimap<string, string> const & kv, string k)
707 string const v = get_required_string (kv, k);
708 return lexical_cast<float> (v);
712 get_optional_string (multimap<string, string> const & kv, string k)
714 if (kv.count (k) > 1) {
715 throw StringError (N_("unexpected multiple keys in key-value set"));
718 multimap<string, string>::const_iterator i = kv.find (k);
719 if (i == kv.end ()) {
727 get_optional_int (multimap<string, string> const & kv, string k)
729 if (kv.count (k) > 1) {
730 throw StringError (N_("unexpected multiple keys in key-value set"));
733 multimap<string, string>::const_iterator i = kv.find (k);
734 if (i == kv.end ()) {
738 return lexical_cast<int> (i->second);
741 /** Construct an AudioBuffers. Audio data is undefined after this constructor.
742 * @param channels Number of channels.
743 * @param frames Number of frames to reserve space for.
745 AudioBuffers::AudioBuffers (int channels, int frames)
746 : _channels (channels)
748 , _allocated_frames (frames)
750 _data = new float*[_channels];
751 for (int i = 0; i < _channels; ++i) {
752 _data[i] = new float[frames];
756 /** Copy constructor.
757 * @param other Other AudioBuffers; data is copied.
759 AudioBuffers::AudioBuffers (AudioBuffers const & other)
760 : _channels (other._channels)
761 , _frames (other._frames)
762 , _allocated_frames (other._frames)
764 _data = new float*[_channels];
765 for (int i = 0; i < _channels; ++i) {
766 _data[i] = new float[_frames];
767 memcpy (_data[i], other._data[i], _frames * sizeof (float));
771 /** AudioBuffers destructor */
772 AudioBuffers::~AudioBuffers ()
774 for (int i = 0; i < _channels; ++i) {
781 /** @param c Channel index.
782 * @return Buffer for this channel.
785 AudioBuffers::data (int c) const
787 assert (c >= 0 && c < _channels);
791 /** Set the number of frames that these AudioBuffers will report themselves
793 * @param f Frames; must be less than or equal to the number of allocated frames.
796 AudioBuffers::set_frames (int f)
798 assert (f <= _allocated_frames);
802 /** Make all samples on all channels silent */
804 AudioBuffers::make_silent ()
806 for (int i = 0; i < _channels; ++i) {
811 /** Make all samples on a given channel silent.
815 AudioBuffers::make_silent (int c)
817 assert (c >= 0 && c < _channels);
819 for (int i = 0; i < _frames; ++i) {
824 /** Copy data from another AudioBuffers to this one. All channels are copied.
825 * @param from AudioBuffers to copy from; must have the same number of channels as this.
826 * @param frames_to_copy Number of frames to copy.
827 * @param read_offset Offset to read from in `from'.
828 * @param write_offset Offset to write to in `to'.
831 AudioBuffers::copy_from (AudioBuffers* from, int frames_to_copy, int read_offset, int write_offset)
833 assert (from->channels() == channels());
836 assert (read_offset >= 0 && (read_offset + frames_to_copy) <= from->_allocated_frames);
837 assert (write_offset >= 0 && (write_offset + frames_to_copy) <= _allocated_frames);
839 for (int i = 0; i < _channels; ++i) {
840 memcpy (_data[i] + write_offset, from->_data[i] + read_offset, frames_to_copy * sizeof(float));
844 /** Move audio data around.
845 * @param from Offset to move from.
846 * @param to Offset to move to.
847 * @param frames Number of frames to move.
851 AudioBuffers::move (int from, int to, int frames)
858 assert (from < _frames);
860 assert (to < _frames);
862 assert (frames <= _frames);
863 assert ((from + frames) <= _frames);
864 assert ((to + frames) <= _frames);
866 for (int i = 0; i < _channels; ++i) {
867 memmove (_data[i] + to, _data[i] + from, frames * sizeof(float));
871 /** Add data from from `from', `from_channel' to our channel `to_channel' */
873 AudioBuffers::accumulate (shared_ptr<AudioBuffers> from, int from_channel, int to_channel)
875 int const N = frames ();
876 assert (from->frames() == N);
878 float* s = from->data (from_channel);
879 float* d = _data[to_channel];
881 for (int i = 0; i < N; ++i) {
886 /** Trip an assert if the caller is not in the UI thread */
890 assert (boost::this_thread::get_id() == ui_thread);
893 /** @param v Content video frame.
894 * @param audio_sample_rate Source audio sample rate.
895 * @param frames_per_second Number of video frames per second.
896 * @return Equivalent number of audio frames for `v'.
899 video_frames_to_audio_frames (ContentVideoFrame v, float audio_sample_rate, float frames_per_second)
901 return ((int64_t) v * audio_sample_rate / frames_per_second);
904 /** @return A pair containing CPU model name and the number of processors */
908 pair<string, int> info;
911 #ifdef DVDOMATIC_POSIX
912 ifstream f (N_("/proc/cpuinfo"));
916 if (boost::algorithm::starts_with (l, N_("model name"))) {
917 string::size_type const c = l.find (':');
918 if (c != string::npos) {
919 info.first = l.substr (c + 2);
921 } else if (boost::algorithm::starts_with (l, N_("processor"))) {
931 audio_channel_name (int c)
933 assert (MAX_AUDIO_CHANNELS == 6);
935 /* TRANSLATORS: these are the names of audio channels; Lfe (sub) is the low-frequency
936 enhancement channel (sub-woofer)./
938 string const channels[] = {
950 FrameRateConversion::FrameRateConversion (float source, int dcp)
953 , change_speed (false)
955 if (fabs (source / 2.0 - dcp) < (fabs (source - dcp))) {
957 } else if (fabs (source * 2 - dcp) < fabs (source - dcp)) {
961 change_speed = !about_equal (source * factor(), dcp);
963 if (!skip && !repeat && !change_speed) {
964 description = _("DCP and source have the same rate.\n");
967 description = _("DCP will use every other frame of the source.\n");
969 description = _("Each source frame will be doubled in the DCP.\n");
973 float const pc = dcp * 100 / (source * factor());
974 description += String::compose (_("DCP will run at %1%% of the source speed."), pc);