+
+string
+careful_string_filter (string s)
+{
+ /* Filter out `bad' characters which `may' cause problems with some systems (either for DCP name or filename).
+ There's no apparent list of what really is allowed, so this is a guess.
+ Safety first and all that.
+ */
+
+ string out;
+ string const allowed = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_%.";
+ for (size_t i = 0; i < s.size(); ++i) {
+ if (allowed.find (s[i]) != string::npos) {
+ out += s[i];
+ }
+ }
+
+ return out;
+}
+
+/** @param mapped List of mapped audio channels from a Film.
+ * @param channels Total number of channels in the Film.
+ * @return First: number of non-LFE channels, second: number of LFE channels.
+ */
+pair<int, int>
+audio_channel_types (list<int> mapped, int channels)
+{
+ int non_lfe = 0;
+ int lfe = 0;
+
+ BOOST_FOREACH (int i, mapped) {
+ if (i >= channels) {
+ /* This channel is mapped but is not included in the DCP */
+ continue;
+ }
+
+ if (static_cast<dcp::Channel> (i) == dcp::LFE) {
+ ++lfe;
+ } else {
+ ++non_lfe;
+ }
+ }
+
+ return make_pair (non_lfe, lfe);
+}