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"
65 using namespace boost;
70 /** Convert some number of seconds to a string representation
71 * in hours, minutes and seconds.
74 * @return String of the form H:M:S (where H is hours, M
75 * is minutes and S is seconds).
78 seconds_to_hms (int s)
88 hms << setfill ('0') << m << ":";
90 hms << setfill ('0') << s;
95 /** @param s Number of seconds.
96 * @return String containing an approximate description of s (e.g. "about 2 hours")
99 seconds_to_approximate_hms (int s)
110 ap << (h + 1) << " hours";
122 ap << m << " minutes";
125 ap << s << " seconds";
131 #ifdef DVDOMATIC_POSIX
132 /** @param l Mangled C++ identifier.
133 * @return Demangled version.
138 string::size_type const b = l.find_first_of ("(");
139 if (b == string::npos) {
143 string::size_type const p = l.find_last_of ("+");
144 if (p == string::npos) {
152 string const fn = l.substr (b + 1, p - b - 1);
157 char* realname = abi::__cxa_demangle (fn.c_str(), 0, 0, &status);
162 } catch (std::exception) {
169 /** Write a stacktrace to an ostream.
170 * @param out Stream to write to.
171 * @param levels Number of levels to go up the call stack.
174 stacktrace (ostream& out, int levels)
181 size = backtrace (array, 200);
182 strings = backtrace_symbols (array, size);
185 for (i = 0; i < size && (levels == 0 || i < size_t(levels)); i++) {
186 out << " " << demangle (strings[i]) << endl;
194 /** @param v Version as used by FFmpeg.
195 * @return A string representation of v.
198 ffmpeg_version_to_string (int v)
201 s << ((v & 0xff0000) >> 16) << "." << ((v & 0xff00) >> 8) << "." << (v & 0xff);
205 /** Return a user-readable string summarising the versions of our dependencies */
207 dependency_version_summary ()
210 s << "libopenjpeg " << opj_version () << ", "
211 << "libavcodec " << ffmpeg_version_to_string (avcodec_version()) << ", "
212 << "libavfilter " << ffmpeg_version_to_string (avfilter_version()) << ", "
213 << "libavformat " << ffmpeg_version_to_string (avformat_version()) << ", "
214 << "libavutil " << ffmpeg_version_to_string (avutil_version()) << ", "
215 << "libpostproc " << ffmpeg_version_to_string (postproc_version()) << ", "
216 << "libswscale " << ffmpeg_version_to_string (swscale_version()) << ", "
217 << MagickVersion << ", "
218 << "libssh " << ssh_version (0) << ", "
219 << "libdcp " << libdcp::version << " git " << libdcp::git_commit;
225 seconds (struct timeval t)
227 return t.tv_sec + (double (t.tv_usec) / 1e6);
230 /** Call the required functions to set up DVD-o-matic's static arrays, etc.
231 * Must be called from the UI thread, if there is one.
236 Format::setup_formats ();
237 DCPContentType::setup_dcp_content_types ();
238 Scaler::setup_scalers ();
239 Filter::setup_filters ();
240 SoundProcessor::setup_sound_processors ();
242 ui_thread = this_thread::get_id ();
245 /** @param start Start position for the crop within the image.
246 * @param size Size of the cropped area.
247 * @return FFmpeg crop filter string.
250 crop_string (Position start, libdcp::Size size)
253 s << "crop=" << size.width << ":" << size.height << ":" << start.x << ":" << start.y;
257 /** @param s A string.
258 * @return Parts of the string split at spaces, except when a space is within quotation marks.
261 split_at_spaces_considering_quotes (string s)
264 bool in_quotes = false;
266 for (string::size_type i = 0; i < s.length(); ++i) {
267 if (s[i] == ' ' && !in_quotes) {
270 } else if (s[i] == '"') {
271 in_quotes = !in_quotes;
282 md5_digest (void const * data, int size)
285 MD5_Init (&md5_context);
286 MD5_Update (&md5_context, data, size);
287 unsigned char digest[MD5_DIGEST_LENGTH];
288 MD5_Final (digest, &md5_context);
291 for (int i = 0; i < MD5_DIGEST_LENGTH; ++i) {
292 s << hex << setfill('0') << setw(2) << ((int) digest[i]);
298 /** @param file File name.
299 * @return MD5 digest of file's contents.
302 md5_digest (string file)
304 ifstream f (file.c_str(), ios::binary);
306 throw OpenFileError (file);
309 f.seekg (0, ios::end);
310 int bytes = f.tellg ();
311 f.seekg (0, ios::beg);
313 int const buffer_size = 64 * 1024;
314 char buffer[buffer_size];
317 MD5_Init (&md5_context);
319 int const t = min (bytes, buffer_size);
321 MD5_Update (&md5_context, buffer, t);
325 unsigned char digest[MD5_DIGEST_LENGTH];
326 MD5_Final (digest, &md5_context);
329 for (int i = 0; i < MD5_DIGEST_LENGTH; ++i) {
330 s << hex << setfill('0') << setw(2) << ((int) digest[i]);
336 static bool about_equal (float a, float b)
338 /* A film of F seconds at f FPS will be Ff frames;
339 Consider some delta FPS d, so if we run the same
340 film at (f + d) FPS it will last F(f + d) seconds.
342 Hence the difference in length over the length of the film will
343 be F(f + d) - Ff frames
344 = Ff + Fd - Ff frames
348 So if we accept a difference of 1 frame, ie 1/f seconds, we can
355 So for a 3hr film, ie F = 3 * 60 * 60 = 10800, the acceptable
356 FPS error is 1/F ~= 0.0001 ~= 10-e4
359 return (fabs (a - b) < 1e-4);
362 class FrameRateCandidate
365 FrameRateCandidate (float source_, int dcp_)
371 return !about_equal (source, dcp) && source > dcp;
374 bool repeat () const {
375 return !about_equal (source, dcp) && source < dcp;
382 /** @param fps Arbitrary source frames-per-second value */
383 /** XXX: this could be slow-ish */
384 DCPFrameRate::DCPFrameRate (float source_fps)
386 list<int> const allowed_dcp_frame_rates = Config::instance()->allowed_dcp_frame_rates ();
388 /* Work out what rates we could manage, including those achieved by using skip / repeat. */
389 list<FrameRateCandidate> candidates;
391 /* Start with the ones without skip / repeat so they will get matched in preference to skipped/repeated ones */
392 for (list<int>::const_iterator i = allowed_dcp_frame_rates.begin(); i != allowed_dcp_frame_rates.end(); ++i) {
393 candidates.push_back (FrameRateCandidate (*i, *i));
396 /* Then the skip/repeat ones */
397 for (list<int>::const_iterator i = allowed_dcp_frame_rates.begin(); i != allowed_dcp_frame_rates.end(); ++i) {
398 candidates.push_back (FrameRateCandidate (float (*i) / 2, *i));
399 candidates.push_back (FrameRateCandidate (float (*i) * 2, *i));
402 /* Pick the best one, bailing early if we hit an exact match */
403 float error = numeric_limits<float>::max ();
404 boost::optional<FrameRateCandidate> best;
405 list<FrameRateCandidate>::iterator i = candidates.begin();
406 while (i != candidates.end()) {
408 if (about_equal (i->source, source_fps)) {
413 float const e = fabs (i->source - source_fps);
423 throw EncodeError ("cannot find a suitable DCP frame rate for this source");
426 frames_per_second = best->dcp;
427 skip = best->skip ();
428 repeat = best->repeat ();
429 change_speed = !about_equal (source_fps * factor(), frames_per_second);
432 /** @param An arbitrary sampling rate.
433 * @return The appropriate DCP-approved sampling rate (48kHz or 96kHz).
436 dcp_audio_sample_rate (int fs)
446 dcp_audio_channels (int f)
449 /* The source is mono, so to put the mono channel into
450 the centre we need to generate a 5.1 soundtrack.
458 bool operator== (Crop const & a, Crop const & b)
460 return (a.left == b.left && a.right == b.right && a.top == b.top && a.bottom == b.bottom);
463 bool operator!= (Crop const & a, Crop const & b)
468 /** @param index Colour LUT index.
469 * @return Human-readable name.
472 colour_lut_index_to_name (int index)
486 : _deadline (_io_service)
487 , _socket (_io_service)
490 _deadline.expires_at (posix_time::pos_infin);
497 if (_deadline.expires_at() <= asio::deadline_timer::traits_type::now ()) {
499 _deadline.expires_at (posix_time::pos_infin);
502 _deadline.async_wait (boost::bind (&Socket::check, this));
505 /** Blocking connect with timeout.
506 * @param endpoint End-point to connect to.
507 * @param timeout Time-out in seconds.
510 Socket::connect (asio::ip::basic_resolver_entry<asio::ip::tcp> const & endpoint, int timeout)
512 _deadline.expires_from_now (posix_time::seconds (timeout));
513 system::error_code ec = asio::error::would_block;
514 _socket.async_connect (endpoint, lambda::var(ec) = lambda::_1);
516 _io_service.run_one();
517 } while (ec == asio::error::would_block);
519 if (ec || !_socket.is_open ()) {
520 throw NetworkError ("connect timed out");
524 /** Blocking write with timeout.
525 * @param data Buffer to write.
526 * @param size Number of bytes to write.
527 * @param timeout Time-out, in seconds.
530 Socket::write (uint8_t const * data, int size, int timeout)
532 _deadline.expires_from_now (posix_time::seconds (timeout));
533 system::error_code ec = asio::error::would_block;
535 asio::async_write (_socket, asio::buffer (data, size), lambda::var(ec) = lambda::_1);
537 _io_service.run_one ();
538 } while (ec == asio::error::would_block);
541 throw NetworkError ("write timed out");
545 /** Blocking read with timeout.
546 * @param data Buffer to read to.
547 * @param size Number of bytes to read.
548 * @param timeout Time-out, in seconds.
551 Socket::read (uint8_t* data, int size, int timeout)
553 _deadline.expires_from_now (posix_time::seconds (timeout));
554 system::error_code ec = asio::error::would_block;
558 _socket.async_read_some (
559 asio::buffer (data, size),
560 (lambda::var(ec) = lambda::_1, lambda::var(amount_read) = lambda::_2)
564 _io_service.run_one ();
565 } while (ec == asio::error::would_block);
574 /** Mark some data as being `consumed', so that it will not be returned
576 * @param size Amount of data to consume, in bytes.
579 Socket::consume (int size)
581 assert (_buffer_data >= size);
583 _buffer_data -= size;
584 if (_buffer_data > 0) {
585 /* Shift still-valid data to the start of the buffer */
586 memmove (_buffer, _buffer + size, _buffer_data);
590 /** Read a definite amount of data from our socket, and mark
592 * @param data Where to put the data.
593 * @param size Number of bytes to read.
596 Socket::read_definite_and_consume (uint8_t* data, int size, int timeout)
598 int const from_buffer = min (_buffer_data, size);
599 if (from_buffer > 0) {
600 /* Get data from our buffer */
601 memcpy (data, _buffer, from_buffer);
602 consume (from_buffer);
603 /* Update our output state */
608 /* read() the rest */
610 int const n = read (data, size, timeout);
612 throw NetworkError ("could not read");
620 /** Read as much data as is available, up to some limit.
621 * @param data Where to put the data.
622 * @param size Maximum amount of data to read.
625 Socket::read_indefinite (uint8_t* data, int size, int timeout)
627 assert (size < int (sizeof (_buffer)));
629 /* Amount of extra data we need to read () */
630 int to_read = size - _buffer_data;
631 while (to_read > 0) {
632 /* read as much of it as we can (into our buffer) */
633 int const n = read (_buffer + _buffer_data, to_read, timeout);
635 throw NetworkError ("could not read");
642 assert (_buffer_data >= size);
644 /* copy data into the output buffer */
645 assert (size >= _buffer_data);
646 memcpy (data, _buffer, size);
649 /** @param other A Rect.
650 * @return The intersection of this with `other'.
653 Rect::intersection (Rect const & other) const
655 int const tx = max (x, other.x);
656 int const ty = max (y, other.y);
660 min (x + width, other.x + other.width) - tx,
661 min (y + height, other.y + other.height) - ty
665 /** Round a number up to the nearest multiple of another number.
667 * @param s Array of numbers to round, indexed by c.
668 * @param t Multiple to round to.
669 * @return Rounded number.
672 stride_round_up (int c, int const * stride, int t)
674 int const a = stride[c] + (t - 1);
679 stride_lookup (int c, int const * stride)
684 /** Read a sequence of key / value pairs from a text stream;
685 * the keys are the first words on the line, and the values are
686 * the remainder of the line following the key. Lines beginning
687 * with # are ignored.
688 * @param s Stream to read.
689 * @return key/value pairs.
691 multimap<string, string>
692 read_key_value (istream &s)
694 multimap<string, string> kv;
697 while (getline (s, line)) {
702 if (line[0] == '#') {
706 if (line[line.size() - 1] == '\r') {
707 line = line.substr (0, line.size() - 1);
710 size_t const s = line.find (' ');
711 if (s == string::npos) {
715 kv.insert (make_pair (line.substr (0, s), line.substr (s + 1)));
722 get_required_string (multimap<string, string> const & kv, string k)
724 if (kv.count (k) > 1) {
725 throw StringError ("unexpected multiple keys in key-value set");
728 multimap<string, string>::const_iterator i = kv.find (k);
730 if (i == kv.end ()) {
731 throw StringError (String::compose ("missing key %1 in key-value set", k));
738 get_required_int (multimap<string, string> const & kv, string k)
740 string const v = get_required_string (kv, k);
741 return lexical_cast<int> (v);
745 get_required_float (multimap<string, string> const & kv, string k)
747 string const v = get_required_string (kv, k);
748 return lexical_cast<float> (v);
752 get_optional_string (multimap<string, string> const & kv, string k)
754 if (kv.count (k) > 1) {
755 throw StringError ("unexpected multiple keys in key-value set");
758 multimap<string, string>::const_iterator i = kv.find (k);
759 if (i == kv.end ()) {
767 get_optional_int (multimap<string, string> const & kv, string k)
769 if (kv.count (k) > 1) {
770 throw StringError ("unexpected multiple keys in key-value set");
773 multimap<string, string>::const_iterator i = kv.find (k);
774 if (i == kv.end ()) {
778 return lexical_cast<int> (i->second);
781 /** Construct an AudioBuffers. Audio data is undefined after this constructor.
782 * @param channels Number of channels.
783 * @param frames Number of frames to reserve space for.
785 AudioBuffers::AudioBuffers (int channels, int frames)
786 : _channels (channels)
788 , _allocated_frames (frames)
790 _data = new float*[_channels];
791 for (int i = 0; i < _channels; ++i) {
792 _data[i] = new float[frames];
796 /** Copy constructor.
797 * @param other Other AudioBuffers; data is copied.
799 AudioBuffers::AudioBuffers (AudioBuffers const & other)
800 : _channels (other._channels)
801 , _frames (other._frames)
802 , _allocated_frames (other._frames)
804 _data = new float*[_channels];
805 for (int i = 0; i < _channels; ++i) {
806 _data[i] = new float[_frames];
807 memcpy (_data[i], other._data[i], _frames * sizeof (float));
811 /** AudioBuffers destructor */
812 AudioBuffers::~AudioBuffers ()
814 for (int i = 0; i < _channels; ++i) {
821 /** @param c Channel index.
822 * @return Buffer for this channel.
825 AudioBuffers::data (int c) const
827 assert (c >= 0 && c < _channels);
831 /** Set the number of frames that these AudioBuffers will report themselves
833 * @param f Frames; must be less than or equal to the number of allocated frames.
836 AudioBuffers::set_frames (int f)
838 assert (f <= _allocated_frames);
842 /** Make all samples on all channels silent */
844 AudioBuffers::make_silent ()
846 for (int i = 0; i < _channels; ++i) {
851 /** Make all samples on a given channel silent.
855 AudioBuffers::make_silent (int c)
857 assert (c >= 0 && c < _channels);
859 for (int i = 0; i < _frames; ++i) {
864 /** Copy data from another AudioBuffers to this one. All channels are copied.
865 * @param from AudioBuffers to copy from; must have the same number of channels as this.
866 * @param frames_to_copy Number of frames to copy.
867 * @param read_offset Offset to read from in `from'.
868 * @param write_offset Offset to write to in `to'.
871 AudioBuffers::copy_from (AudioBuffers* from, int frames_to_copy, int read_offset, int write_offset)
873 assert (from->channels() == channels());
876 assert (read_offset >= 0 && (read_offset + frames_to_copy) <= from->_allocated_frames);
877 assert (write_offset >= 0 && (write_offset + frames_to_copy) <= _allocated_frames);
879 for (int i = 0; i < _channels; ++i) {
880 memcpy (_data[i] + write_offset, from->_data[i] + read_offset, frames_to_copy * sizeof(float));
884 /** Move audio data around.
885 * @param from Offset to move from.
886 * @param to Offset to move to.
887 * @param frames Number of frames to move.
891 AudioBuffers::move (int from, int to, int frames)
898 assert (from < _frames);
900 assert (to < _frames);
902 assert (frames <= _frames);
903 assert ((from + frames) <= _frames);
904 assert ((to + frames) <= _frames);
906 for (int i = 0; i < _channels; ++i) {
907 memmove (_data[i] + to, _data[i] + from, frames * sizeof(float));
911 /** Trip an assert if the caller is not in the UI thread */
915 assert (this_thread::get_id() == ui_thread);
918 /** @param v Source video frame.
919 * @param audio_sample_rate Source audio sample rate.
920 * @param frames_per_second Number of video frames per second.
921 * @return Equivalent number of audio frames for `v'.
924 video_frames_to_audio_frames (SourceFrame v, float audio_sample_rate, float frames_per_second)
926 return ((int64_t) v * audio_sample_rate / frames_per_second);
929 /** @param f Filename.
930 * @return true if this file is a still image, false if it is something else.
933 still_image_file (string f)
935 #if BOOST_FILESYSTEM_VERSION == 3
936 string ext = boost::filesystem::path(f).extension().string();
938 string ext = boost::filesystem::path(f).extension();
941 transform (ext.begin(), ext.end(), ext.begin(), ::tolower);
943 return (ext == ".tif" || ext == ".tiff" || ext == ".jpg" || ext == ".jpeg" || ext == ".png");
946 /** @return A pair containing CPU model name and the number of processors */
950 pair<string, int> info;
953 #ifdef DVDOMATIC_POSIX
954 ifstream f ("/proc/cpuinfo");
958 if (boost::algorithm::starts_with (l, "model name")) {
959 string::size_type const c = l.find (':');
960 if (c != string::npos) {
961 info.first = l.substr (c + 2);
963 } else if (boost::algorithm::starts_with (l, "processor")) {