+/** Call the required functions to set up DVD-o-matic's static arrays, etc.
+ * Must be called from the UI thread, if there is one.
+ */
+void
+dvdomatic_setup ()
+{
+ avfilter_register_all ();
+
+ Format::setup_formats ();
+ DCPContentType::setup_dcp_content_types ();
+ Scaler::setup_scalers ();
+ Filter::setup_filters ();
+ SoundProcessor::setup_sound_processors ();
+
+ ui_thread = this_thread::get_id ();
+}
+
+/** @param start Start position for the crop within the image.
+ * @param size Size of the cropped area.
+ * @return FFmpeg crop filter string.
+ */
+string
+crop_string (Position start, libdcp::Size size)
+{
+ stringstream s;
+ s << "crop=" << size.width << ":" << size.height << ":" << start.x << ":" << start.y;
+ return s.str ();
+}
+
+/** @param s A string.
+ * @return Parts of the string split at spaces, except when a space is within quotation marks.
+ */
+vector<string>
+split_at_spaces_considering_quotes (string s)
+{
+ vector<string> out;
+ bool in_quotes = false;
+ string c;
+ for (string::size_type i = 0; i < s.length(); ++i) {
+ if (s[i] == ' ' && !in_quotes) {
+ out.push_back (c);
+ c = "";
+ } else if (s[i] == '"') {
+ in_quotes = !in_quotes;
+ } else {
+ c += s[i];
+ }
+ }
+
+ out.push_back (c);
+ return out;
+}
+
+string
+md5_digest (void const * data, int size)
+{
+ MD5_CTX md5_context;
+ MD5_Init (&md5_context);
+ MD5_Update (&md5_context, data, size);
+ unsigned char digest[MD5_DIGEST_LENGTH];
+ MD5_Final (digest, &md5_context);
+
+ stringstream s;
+ for (int i = 0; i < MD5_DIGEST_LENGTH; ++i) {
+ s << hex << setfill('0') << setw(2) << ((int) digest[i]);
+ }
+
+ return s.str ();
+}
+
+/** @param file File name.
+ * @return MD5 digest of file's contents.
+ */
+string
+md5_digest (string file)
+{
+ ifstream f (file.c_str(), ios::binary);
+ if (!f.good ()) {
+ throw OpenFileError (file);
+ }
+
+ f.seekg (0, ios::end);
+ int bytes = f.tellg ();
+ f.seekg (0, ios::beg);
+
+ int const buffer_size = 64 * 1024;
+ char buffer[buffer_size];
+
+ MD5_CTX md5_context;
+ MD5_Init (&md5_context);
+ while (bytes > 0) {
+ int const t = min (bytes, buffer_size);
+ f.read (buffer, t);
+ MD5_Update (&md5_context, buffer, t);
+ bytes -= t;
+ }
+
+ unsigned char digest[MD5_DIGEST_LENGTH];
+ MD5_Final (digest, &md5_context);
+
+ stringstream s;
+ for (int i = 0; i < MD5_DIGEST_LENGTH; ++i) {
+ s << hex << setfill('0') << setw(2) << ((int) digest[i]);
+ }
+
+ return s.str ();
+}
+
+static bool about_equal (float a, float b)
+{
+ /* A film of F seconds at f FPS will be Ff frames;
+ Consider some delta FPS d, so if we run the same
+ film at (f + d) FPS it will last F(f + d) seconds.
+
+ Hence the difference in length over the length of the film will
+ be F(f + d) - Ff frames
+ = Ff + Fd - Ff frames
+ = Fd frames
+ = Fd/f seconds
+
+ So if we accept a difference of 1 frame, ie 1/f seconds, we can
+ say that
+
+ 1/f = Fd/f
+ ie 1 = Fd
+ ie d = 1/F
+
+ So for a 3hr film, ie F = 3 * 60 * 60 = 10800, the acceptable
+ FPS error is 1/F ~= 0.0001 ~= 10-e4
+ */
+
+ return (fabs (a - b) < 1e-4);
+}
+
+class FrameRateCandidate
+{
+public:
+ FrameRateCandidate (float source_, int dcp_)
+ : source (source_)
+ , dcp (dcp_)
+ {}
+
+ bool skip () const {
+ return !about_equal (source, dcp) && source > dcp;
+ }
+
+ bool repeat () const {
+ return !about_equal (source, dcp) && source < dcp;
+ }
+
+ float source;
+ int dcp;
+};
+
+/** @param fps Arbitrary source frames-per-second value */
+/** XXX: this could be slow-ish */
+DCPFrameRate::DCPFrameRate (float source_fps)
+{
+ list<int> const allowed_dcp_frame_rates = Config::instance()->allowed_dcp_frame_rates ();
+
+ /* Work out what rates we could manage, including those achieved by using skip / repeat. */
+ list<FrameRateCandidate> candidates;
+
+ /* Start with the ones without skip / repeat so they will get matched in preference to skipped/repeated ones */
+ for (list<int>::const_iterator i = allowed_dcp_frame_rates.begin(); i != allowed_dcp_frame_rates.end(); ++i) {
+ candidates.push_back (FrameRateCandidate (*i, *i));
+ }
+
+ /* Then the skip/repeat ones */
+ for (list<int>::const_iterator i = allowed_dcp_frame_rates.begin(); i != allowed_dcp_frame_rates.end(); ++i) {
+ candidates.push_back (FrameRateCandidate (float (*i) / 2, *i));
+ candidates.push_back (FrameRateCandidate (float (*i) * 2, *i));
+ }
+
+ /* Pick the best one, bailing early if we hit an exact match */
+ float error = numeric_limits<float>::max ();
+ boost::optional<FrameRateCandidate> best;
+ list<FrameRateCandidate>::iterator i = candidates.begin();
+ while (i != candidates.end()) {
+
+ if (about_equal (i->source, source_fps)) {
+ best = *i;
+ break;
+ }
+
+ float const e = fabs (i->source - source_fps);
+ if (e < error) {
+ error = e;
+ best = *i;
+ }
+
+ ++i;
+ }
+
+ if (!best) {
+ throw EncodeError ("cannot find a suitable DCP frame rate for this source");
+ }
+
+ frames_per_second = best->dcp;
+ skip = best->skip ();
+ repeat = best->repeat ();
+ change_speed = !about_equal (source_fps * factor(), frames_per_second);
+}
+
+/** @param An arbitrary sampling rate.
+ * @return The appropriate DCP-approved sampling rate (48kHz or 96kHz).
+ */
+int
+dcp_audio_sample_rate (int fs)
+{
+ if (fs <= 48000) {
+ return 48000;
+ }
+
+ return 96000;
+}
+
+int
+dcp_audio_channels (int f)
+{
+ if (f == 1) {
+ /* The source is mono, so to put the mono channel into
+ the centre we need to generate a 5.1 soundtrack.
+ */
+ return 6;
+ }
+
+ return f;
+}
+
+bool operator== (Crop const & a, Crop const & b)
+{
+ return (a.left == b.left && a.right == b.right && a.top == b.top && a.bottom == b.bottom);
+}
+
+bool operator!= (Crop const & a, Crop const & b)
+{
+ return !(a == b);
+}
+
+/** @param index Colour LUT index.
+ * @return Human-readable name.
+ */
+string
+colour_lut_index_to_name (int index)
+{
+ switch (index) {
+ case 0:
+ return "sRGB";
+ case 1:
+ return "Rec 709";
+ }
+
+ assert (false);
+ return "";
+}
+
+Socket::Socket ()
+ : _deadline (_io_service)
+ , _socket (_io_service)