#include <iomanip>
#include <sstream>
#include <boost/filesystem.hpp>
+#include <boost/date_time.hpp>
+#include <boost/algorithm/string.hpp>
#include "film_state.h"
#include "scaler.h"
#include "filter.h"
#include "dcp_content_type.h"
#include "util.h"
#include "exceptions.h"
+#include "options.h"
+#include "decoder.h"
+#include "decoder_factory.h"
using namespace std;
using namespace boost;
-/** Write state to a stream.
- * @param f Stream to write to.
- */
+/** Write state to our `metadata' file */
void
-FilmState::write_metadata (ofstream& f) const
+FilmState::write_metadata () const
{
+ filesystem::create_directories (directory());
+
+ string const m = file ("metadata");
+ ofstream f (m.c_str ());
+ if (!f.good ()) {
+ throw CreateFileError (m);
+ }
+
/* User stuff */
- f << "name " << name << "\n";
- f << "content " << content << "\n";
- if (dcp_content_type) {
- f << "dcp_content_type " << dcp_content_type->pretty_name () << "\n";
- }
- f << "frames_per_second " << frames_per_second << "\n";
- if (format) {
- f << "format " << format->as_metadata () << "\n";
- }
- f << "left_crop " << crop.left << "\n";
- f << "right_crop " << crop.right << "\n";
- f << "top_crop " << crop.top << "\n";
- f << "bottom_crop " << crop.bottom << "\n";
- for (vector<Filter const *>::const_iterator i = filters.begin(); i != filters.end(); ++i) {
+ f << "name " << _name << "\n";
+ f << "use_dci_name " << _use_dci_name << "\n";
+ f << "content " << _content << "\n";
+ if (_dcp_content_type) {
+ f << "dcp_content_type " << _dcp_content_type->pretty_name () << "\n";
+ }
+ if (_format) {
+ f << "format " << _format->as_metadata () << "\n";
+ }
+ f << "left_crop " << _crop.left << "\n";
+ f << "right_crop " << _crop.right << "\n";
+ f << "top_crop " << _crop.top << "\n";
+ f << "bottom_crop " << _crop.bottom << "\n";
+ for (vector<Filter const *>::const_iterator i = _filters.begin(); i != _filters.end(); ++i) {
f << "filter " << (*i)->id () << "\n";
}
- f << "scaler " << scaler->id () << "\n";
- f << "dcp_frames " << dcp_frames << "\n";
+ f << "scaler " << _scaler->id () << "\n";
+ f << "dcp_frames " << _dcp_frames << "\n";
f << "dcp_trim_action ";
- switch (dcp_trim_action) {
+ switch (_dcp_trim_action) {
case CUT:
f << "cut\n";
break;
break;
}
- f << "dcp_ab " << (dcp_ab ? "1" : "0") << "\n";
- f << "audio_gain " << audio_gain << "\n";
- f << "audio_delay " << audio_delay << "\n";
- f << "still_duration " << still_duration << "\n";
+ f << "dcp_ab " << (_dcp_ab ? "1" : "0") << "\n";
+ f << "selected_audio_stream " << _audio_stream << "\n";
+ f << "audio_gain " << _audio_gain << "\n";
+ f << "audio_delay " << _audio_delay << "\n";
+ f << "still_duration " << _still_duration << "\n";
+ f << "selected_subtitle_stream " << _subtitle_stream << "\n";
+ f << "with_subtitles " << _with_subtitles << "\n";
+ f << "subtitle_offset " << _subtitle_offset << "\n";
+ f << "subtitle_scale " << _subtitle_scale << "\n";
+ f << "audio_language " << _audio_language << "\n";
+ f << "subtitle_language " << _subtitle_language << "\n";
+ f << "territory " << _territory << "\n";
+ f << "rating " << _rating << "\n";
+ f << "studio " << _studio << "\n";
+ f << "facility " << _facility << "\n";
+ f << "package_type " << _package_type << "\n";
/* Cached stuff; this is information about our content; we could
look it up each time, but that's slow.
*/
- for (vector<int>::const_iterator i = thumbs.begin(); i != thumbs.end(); ++i) {
+ for (vector<int>::const_iterator i = _thumbs.begin(); i != _thumbs.end(); ++i) {
f << "thumb " << *i << "\n";
}
- f << "width " << size.width << "\n";
- f << "height " << size.height << "\n";
- f << "length " << length << "\n";
- f << "audio_channels " << audio_channels << "\n";
- f << "audio_sample_rate " << audio_sample_rate << "\n";
- f << "audio_sample_format " << audio_sample_format_to_string (audio_sample_format) << "\n";
- f << "content_digest " << content_digest << "\n";
+ f << "width " << _size.width << "\n";
+ f << "height " << _size.height << "\n";
+ f << "length " << _length << "\n";
+ f << "audio_sample_rate " << _audio_sample_rate << "\n";
+ f << "content_digest " << _content_digest << "\n";
+ f << "has_subtitles " << _has_subtitles << "\n";
+
+ for (vector<AudioStream>::const_iterator i = _audio_streams.begin(); i != _audio_streams.end(); ++i) {
+ f << "audio_stream " << i->to_string () << "\n";
+ }
+
+ for (vector<SubtitleStream>::const_iterator i = _subtitle_streams.begin(); i != _subtitle_streams.end(); ++i) {
+ f << "subtitle_stream " << i->to_string () << "\n";
+ }
+
+ f << "frames_per_second " << _frames_per_second << "\n";
+
+ _dirty = false;
}
-/** Read state from a key / value pair.
- * @param k Key.
- * @param v Value.
- */
+/** Read state from our metadata file */
void
-FilmState::read_metadata (string k, string v)
-{
- /* User-specified stuff */
- if (k == "name") {
- name = v;
- } else if (k == "content") {
- content = v;
- } else if (k == "dcp_content_type") {
- dcp_content_type = DCPContentType::from_pretty_name (v);
- } else if (k == "frames_per_second") {
- frames_per_second = atof (v.c_str ());
- } else if (k == "format") {
- format = Format::from_metadata (v);
- } else if (k == "left_crop") {
- crop.left = atoi (v.c_str ());
- } else if (k == "right_crop") {
- crop.right = atoi (v.c_str ());
- } else if (k == "top_crop") {
- crop.top = atoi (v.c_str ());
- } else if (k == "bottom_crop") {
- crop.bottom = atoi (v.c_str ());
- } else if (k == "filter") {
- filters.push_back (Filter::from_id (v));
- } else if (k == "scaler") {
- scaler = Scaler::from_id (v);
- } else if (k == "dcp_frames") {
- dcp_frames = atoi (v.c_str ());
- } else if (k == "dcp_trim_action") {
- if (v == "cut") {
- dcp_trim_action = CUT;
- } else if (v == "black_out") {
- dcp_trim_action = BLACK_OUT;
+FilmState::read_metadata ()
+{
+ ifstream f (file("metadata").c_str());
+ multimap<string, string> kv = read_key_value (f);
+ for (multimap<string, string>::const_iterator i = kv.begin(); i != kv.end(); ++i) {
+ string const k = i->first;
+ string const v = i->second;
+
+ /* User-specified stuff */
+ if (k == "name") {
+ _name = v;
+ } else if (k == "use_dci_name") {
+ _use_dci_name = (v == "1");
+ } else if (k == "content") {
+ _content = v;
+ } else if (k == "dcp_content_type") {
+ _dcp_content_type = DCPContentType::from_pretty_name (v);
+ } else if (k == "format") {
+ _format = Format::from_metadata (v);
+ } else if (k == "left_crop") {
+ _crop.left = atoi (v.c_str ());
+ } else if (k == "right_crop") {
+ _crop.right = atoi (v.c_str ());
+ } else if (k == "top_crop") {
+ _crop.top = atoi (v.c_str ());
+ } else if (k == "bottom_crop") {
+ _crop.bottom = atoi (v.c_str ());
+ } else if (k == "filter") {
+ _filters.push_back (Filter::from_id (v));
+ } else if (k == "scaler") {
+ _scaler = Scaler::from_id (v);
+ } else if (k == "dcp_frames") {
+ _dcp_frames = atoi (v.c_str ());
+ } else if (k == "dcp_trim_action") {
+ if (v == "cut") {
+ _dcp_trim_action = CUT;
+ } else if (v == "black_out") {
+ _dcp_trim_action = BLACK_OUT;
+ }
+ } else if (k == "dcp_ab") {
+ _dcp_ab = (v == "1");
+ } else if (k == "selected_audio_stream") {
+ _audio_stream = atoi (v.c_str ());
+ } else if (k == "audio_gain") {
+ _audio_gain = atof (v.c_str ());
+ } else if (k == "audio_delay") {
+ _audio_delay = atoi (v.c_str ());
+ } else if (k == "still_duration") {
+ _still_duration = atoi (v.c_str ());
+ } else if (k == "selected_subtitle_stream") {
+ _subtitle_stream = atoi (v.c_str ());
+ } else if (k == "with_subtitles") {
+ _with_subtitles = (v == "1");
+ } else if (k == "subtitle_offset") {
+ _subtitle_offset = atoi (v.c_str ());
+ } else if (k == "subtitle_scale") {
+ _subtitle_scale = atof (v.c_str ());
+ } else if (k == "audio_language") {
+ _audio_language = v;
+ } else if (k == "subtitle_language") {
+ _subtitle_language = v;
+ } else if (k == "territory") {
+ _territory = v;
+ } else if (k == "rating") {
+ _rating = v;
+ } else if (k == "studio") {
+ _studio = v;
+ } else if (k == "facility") {
+ _facility = v;
+ } else if (k == "package_type") {
+ _package_type = v;
}
- } else if (k == "dcp_ab") {
- dcp_ab = (v == "1");
- } else if (k == "audio_gain") {
- audio_gain = atof (v.c_str ());
- } else if (k == "audio_delay") {
- audio_delay = atoi (v.c_str ());
- } else if (k == "still_duration") {
- still_duration = atoi (v.c_str ());
- }
-
- /* Cached stuff */
- if (k == "thumb") {
- int const n = atoi (v.c_str ());
- /* Only add it to the list if it still exists */
- if (filesystem::exists (thumb_file_for_frame (n))) {
- thumbs.push_back (n);
+
+ /* Cached stuff */
+ if (k == "thumb") {
+ int const n = atoi (v.c_str ());
+ /* Only add it to the list if it still exists */
+ if (filesystem::exists (thumb_file_for_frame (n))) {
+ _thumbs.push_back (n);
+ }
+ } else if (k == "width") {
+ _size.width = atoi (v.c_str ());
+ } else if (k == "height") {
+ _size.height = atoi (v.c_str ());
+ } else if (k == "length") {
+ _length = atof (v.c_str ());
+ } else if (k == "audio_sample_rate") {
+ _audio_sample_rate = atoi (v.c_str ());
+ } else if (k == "content_digest") {
+ _content_digest = v;
+ } else if (k == "has_subtitles") {
+ _has_subtitles = (v == "1");
+ } else if (k == "audio_stream") {
+ _audio_streams.push_back (AudioStream (v));
+ } else if (k == "subtitle_stream") {
+ _subtitle_streams.push_back (SubtitleStream (v));
+ } else if (k == "frames_per_second") {
+ _frames_per_second = atof (v.c_str ());
}
- } else if (k == "width") {
- size.width = atoi (v.c_str ());
- } else if (k == "height") {
- size.height = atoi (v.c_str ());
- } else if (k == "length") {
- length = atof (v.c_str ());
- } else if (k == "audio_channels") {
- audio_channels = atoi (v.c_str ());
- } else if (k == "audio_sample_rate") {
- audio_sample_rate = atoi (v.c_str ());
- } else if (k == "audio_sample_format") {
- audio_sample_format = audio_sample_format_from_string (v);
- } else if (k == "content_digest") {
- content_digest = v;
}
+
+ _dirty = false;
}
-
/** @param n A thumb index.
* @return The path to the thumb's image file.
*/
*/
string
FilmState::thumb_file_for_frame (int n) const
+{
+ return thumb_base_for_frame(n) + ".png";
+}
+
+string
+FilmState::thumb_base (int n) const
+{
+ return thumb_base_for_frame (thumb_frame (n));
+}
+
+string
+FilmState::thumb_base_for_frame (int n) const
{
stringstream s;
s.width (8);
- s << setfill('0') << n << ".tiff";
+ s << setfill('0') << n;
filesystem::path p;
p /= dir ("thumbs");
int
FilmState::thumb_frame (int n) const
{
- assert (n < int (thumbs.size ()));
- return thumbs[n];
+ assert (n < int (_thumbs.size ()));
+ return _thumbs[n];
}
Size
FilmState::cropped_size (Size s) const
{
- s.width -= crop.left + crop.right;
- s.height -= crop.top + crop.bottom;
+ s.width -= _crop.left + _crop.right;
+ s.height -= _crop.top + _crop.bottom;
return s;
}
FilmState::dir (string d) const
{
filesystem::path p;
- p /= directory;
+ p /= _directory;
p /= d;
filesystem::create_directories (p);
return p.string ();
FilmState::file (string f) const
{
filesystem::path p;
- p /= directory;
+ p /= _directory;
p /= f;
return p.string ();
}
+/** @return full path of the content (actual video) file
+ * of the Film.
+ */
string
FilmState::content_path () const
{
- if (filesystem::path(content).has_root_directory ()) {
- return content;
+ if (filesystem::path(_content).has_root_directory ()) {
+ return _content;
}
- return file (content);
+ return file (_content);
}
ContentType
FilmState::content_type () const
{
#if BOOST_FILESYSTEM_VERSION == 3
- string ext = filesystem::path(content).extension().string();
+ string ext = filesystem::path(_content).extension().string();
#else
- string ext = filesystem::path(content).extension();
+ string ext = filesystem::path(_content).extension();
#endif
transform (ext.begin(), ext.end(), ext.begin(), ::tolower);
return VIDEO;
}
-/** @return Number of bytes per sample of a single channel */
+/** @return The sampling rate that we will resample the audio to */
int
-FilmState::bytes_per_sample () const
+FilmState::target_audio_sample_rate () const
{
- switch (audio_sample_format) {
- case AV_SAMPLE_FMT_S16:
- return 2;
- default:
- return 0;
+ /* Resample to a DCI-approved sample rate */
+ double t = dcp_audio_sample_rate (_audio_sample_rate);
+
+ /* Compensate for the fact that video will be rounded to the
+ nearest integer number of frames per second.
+ */
+ if (rint (_frames_per_second) != _frames_per_second) {
+ t *= _frames_per_second / rint (_frames_per_second);
}
- return 0;
+ return rint (t);
}
int
-FilmState::target_sample_rate () const
-{
- double t = dcp_audio_sample_rate (audio_sample_rate);
- if (rint (frames_per_second) != frames_per_second) {
- if (fabs (frames_per_second - 23.976) < 1e-6) {
- /* 24fps drop-frame ie 24 * 1000 / 1001 frames per second;
- hence we need to resample the audio to dcp_audio_sample_rate * 1000 / 1001
- so that when we play it back at dcp_audio_sample_rate it is sped up
- by the same amount that the video is
- */
- t *= double(1000) / 1001;
+FilmState::dcp_length () const
+{
+ if (_dcp_frames) {
+ return _dcp_frames;
+ }
+
+ return _length;
+}
+
+/** @return a DCI-compliant name for a DCP of this film */
+string
+FilmState::dci_name () const
+{
+ stringstream d;
+
+ string fixed_name = to_upper_copy (_name);
+ for (size_t i = 0; i < fixed_name.length(); ++i) {
+ if (fixed_name[i] == ' ') {
+ fixed_name[i] = '-';
+ }
+ }
+
+ /* Spec is that the name part should be maximum 14 characters, as I understand it */
+ if (fixed_name.length() > 14) {
+ fixed_name = fixed_name.substr (0, 14);
+ }
+
+ d << fixed_name << "_";
+
+ if (_dcp_content_type) {
+ d << _dcp_content_type->dci_name() << "_";
+ }
+
+ if (_format) {
+ d << _format->dci_name() << "_";
+ }
+
+ if (!_audio_language.empty ()) {
+ d << _audio_language;
+ if (!_subtitle_language.empty() && _with_subtitles) {
+ d << "-" << _subtitle_language;
} else {
- throw EncodeError ("unknown fractional frame rate");
+ d << "-XX";
}
+
+ d << "_";
}
- return rint (t);
+ if (!_territory.empty ()) {
+ d << _territory;
+ if (!_rating.empty ()) {
+ d << "-" << _rating;
+ }
+ d << "_";
+ }
+
+ switch (_audio_streams[_audio_stream].channels()) {
+ case 1:
+ d << "10_";
+ break;
+ case 2:
+ d << "20_";
+ break;
+ case 6:
+ d << "51_";
+ break;
+ case 8:
+ d << "71_";
+ break;
+ }
+
+ d << "2K_";
+
+ if (!_studio.empty ()) {
+ d << _studio << "_";
+ }
+
+ gregorian::date today = gregorian::day_clock::local_day ();
+ d << gregorian::to_iso_string (today) << "_";
+
+ if (!_facility.empty ()) {
+ d << _facility << "_";
+ }
+
+ if (!_package_type.empty ()) {
+ d << _package_type;
+ }
+
+ return d.str ();
+}
+
+/** @return name to give the DCP */
+string
+FilmState::dcp_name () const
+{
+ if (_use_dci_name) {
+ return dci_name ();
+ }
+
+ return _name;
+}
+
+
+void
+FilmState::set_directory (string d)
+{
+ _directory = d;
+ _dirty = true;
+}
+
+void
+FilmState::set_name (string n)
+{
+ _name = n;
+ signal_changed (NAME);
+}
+
+void
+FilmState::set_use_dci_name (bool u)
+{
+ _use_dci_name = u;
+ signal_changed (USE_DCI_NAME);
+}
+
+void
+FilmState::set_content (string c)
+{
+ string check = _directory;
+
+#if BOOST_FILESYSTEM_VERSION == 3
+ filesystem::path slash ("/");
+ string platform_slash = slash.make_preferred().string ();
+#else
+#ifdef DVDOMATIC_WINDOWS
+ string platform_slash = "\\";
+#else
+ string platform_slash = "/";
+#endif
+#endif
+
+ if (!ends_with (check, platform_slash)) {
+ check += platform_slash;
+ }
+
+ if (filesystem::path(c).has_root_directory () && starts_with (c, check)) {
+ c = c.substr (_directory.length() + 1);
+ }
+
+ if (c == _content) {
+ return;
+ }
+
+ /* Create a temporary decoder so that we can get information
+ about the content.
+ */
+
+ shared_ptr<FilmState> s = state_copy ();
+ s->_content = c;
+ shared_ptr<Options> o (new Options ("", "", ""));
+ o->out_size = Size (1024, 1024);
+
+ shared_ptr<Decoder> d = decoder_factory (s, o, 0, 0);
+
+ set_size (d->native_size ());
+ set_frames_per_second (d->frames_per_second ());
+ set_audio_sample_rate (d->audio_sample_rate ());
+ set_has_subtitles (d->has_subtitles ());
+ set_audio_streams (d->audio_streams ());
+ set_subtitle_streams (d->subtitle_streams ());
+ set_audio_stream (audio_streams().empty() ? -1 : 0);
+ set_subtitle_stream (subtitle_streams().empty() ? -1 : 0);
+
+ _content = c;
+ signal_changed (CONTENT);
+
+ set_content_digest (md5_digest (content_path ()));
+}
+
+void
+FilmState::set_dcp_content_type (DCPContentType const * t)
+{
+ _dcp_content_type = t;
+ signal_changed (DCP_CONTENT_TYPE);
+}
+
+void
+FilmState::set_format (Format const * f)
+{
+ _format = f;
+ signal_changed (FORMAT);
+}
+
+void
+FilmState::set_crop (Crop c)
+{
+ _crop = c;
+ signal_changed (CROP);
+}
+
+void
+FilmState::set_left_crop (int c)
+{
+ if (_crop.left == c) {
+ return;
+ }
+
+ _crop.left = c;
+ signal_changed (CROP);
+}
+
+void
+FilmState::set_right_crop (int c)
+{
+ if (_crop.right == c) {
+ return;
+ }
+
+ _crop.right = c;
+ signal_changed (CROP);
+}
+
+void
+FilmState::set_top_crop (int c)
+{
+ if (_crop.top == c) {
+ return;
+ }
+
+ _crop.top = c;
+ signal_changed (CROP);
+}
+
+void
+FilmState::set_bottom_crop (int c)
+{
+ if (_crop.bottom == c) {
+ return;
+ }
+
+ _crop.bottom = c;
+ signal_changed (CROP);
+}
+
+void
+FilmState::set_filters (vector<Filter const *> f)
+{
+ _filters = f;
+ signal_changed (FILTERS);
+}
+
+void
+FilmState::set_scaler (Scaler const * s)
+{
+ _scaler = s;
+ signal_changed (SCALER);
+}
+
+void
+FilmState::set_dcp_frames (int f)
+{
+ _dcp_frames = f;
+ signal_changed (DCP_FRAMES);
+}
+
+void
+FilmState::set_dcp_trim_action (TrimAction a)
+{
+ _dcp_trim_action = a;
+ signal_changed (DCP_TRIM_ACTION);
+}
+
+void
+FilmState::set_dcp_ab (bool a)
+{
+ _dcp_ab = a;
+ signal_changed (DCP_AB);
+}
+
+void
+FilmState::set_audio_stream (int s)
+{
+ _audio_stream = s;
+ signal_changed (AUDIO_STREAM);
+}
+
+void
+FilmState::set_audio_gain (float g)
+{
+ _audio_gain = g;
+ signal_changed (AUDIO_GAIN);
+}
+
+void
+FilmState::set_audio_delay (int d)
+{
+ _audio_delay = d;
+ signal_changed (AUDIO_DELAY);
+}
+
+void
+FilmState::set_still_duration (int d)
+{
+ _still_duration = d;
+ signal_changed (STILL_DURATION);
+}
+
+void
+FilmState::set_subtitle_stream (int s)
+{
+ _subtitle_stream = s;
+ signal_changed (SUBTITLE_STREAM);
+}
+
+void
+FilmState::set_with_subtitles (bool w)
+{
+ _with_subtitles = w;
+ signal_changed (WITH_SUBTITLES);
+}
+
+void
+FilmState::set_subtitle_offset (int o)
+{
+ _subtitle_offset = o;
+ signal_changed (SUBTITLE_OFFSET);
+}
+
+void
+FilmState::set_subtitle_scale (float s)
+{
+ _subtitle_scale = s;
+ signal_changed (SUBTITLE_SCALE);
+}
+
+void
+FilmState::set_audio_language (string l)
+{
+ _audio_language = l;
+ signal_changed (DCI_METADATA);
+}
+
+void
+FilmState::set_subtitle_language (string l)
+{
+ _subtitle_language = l;
+ signal_changed (DCI_METADATA);
+}
+
+void
+FilmState::set_territory (string t)
+{
+ _territory = t;
+ signal_changed (DCI_METADATA);
+}
+
+void
+FilmState::set_rating (string r)
+{
+ _rating = r;
+ signal_changed (DCI_METADATA);
+}
+
+void
+FilmState::set_studio (string s)
+{
+ _studio = s;
+ signal_changed (DCI_METADATA);
+}
+
+void
+FilmState::set_facility (string f)
+{
+ _facility = f;
+ signal_changed (DCI_METADATA);
+}
+
+void
+FilmState::set_package_type (string p)
+{
+ _package_type = p;
+ signal_changed (DCI_METADATA);
+}
+
+void
+FilmState::set_thumbs (vector<int> t)
+{
+ _thumbs = t;
+ signal_changed (THUMBS);
+}
+
+void
+FilmState::set_size (Size s)
+{
+ _size = s;
+ signal_changed (SIZE);
+}
+
+void
+FilmState::set_length (int l)
+{
+ _length = l;
+ signal_changed (LENGTH);
+}
+
+void
+FilmState::set_audio_sample_rate (int r)
+{
+ _audio_sample_rate = r;
+ signal_changed (AUDIO_SAMPLE_RATE);
+}
+
+void
+FilmState::set_content_digest (string d)
+{
+ _content_digest = d;
+ _dirty = true;
+}
+
+void
+FilmState::set_has_subtitles (bool s)
+{
+ _has_subtitles = s;
+ signal_changed (HAS_SUBTITLES);
+}
+
+void
+FilmState::set_audio_streams (vector<AudioStream> s)
+{
+ _audio_streams = s;
+ _dirty = true;
+}
+
+void
+FilmState::set_subtitle_streams (vector<SubtitleStream> s)
+{
+ _subtitle_streams = s;
+ _dirty = true;
+}
+
+void
+FilmState::set_frames_per_second (float f)
+{
+ _frames_per_second = f;
+ signal_changed (FRAMES_PER_SECOND);
+}
+
+void
+FilmState::signal_changed (Property p)
+{
+ _dirty = true;
+ Changed (p);
+}
+
+shared_ptr<FilmState>
+FilmState::state_copy () const
+{
+ return shared_ptr<FilmState> (new FilmState (*this));
+}
+
+int
+FilmState::audio_channels () const
+{
+ if (_audio_stream == -1) {
+ return 0;
+ }
+
+ return _audio_streams[_audio_stream].channels ();
}