Hand-apply bbfb370d7de28ec1e8f307865cc6253bb5d4366e from master; quicker digest calcu...

[dcpomatic.git] / src / lib / content.cc

diff --git a/src/lib/content.cc b/src/lib/content.cc
index c4836cfa89a643c1838bc94ef302a99c661d9418..550a8cd0577333d88844ea014d2f41b60299c7f7 100644 (file)
--- a/src/lib/content.cc
+++ b/src/lib/content.cc
@@ -21,25 +21,26 @@
  *  @brief Content class.
  */
 
-#include <boost/thread/mutex.hpp>
-#include <libxml++/libxml++.h>
-#include <libcxml/cxml.h>
-#include <dcp/raw_convert.h>
 #include "content.h"
 #include "util.h"
 #include "content_factory.h"
 #include "ui_signaller.h"
 #include "exceptions.h"
 #include "film.h"
+#include "safe_stringstream.h"
+#include "job.h"
+#include <libcxml/cxml.h>
+#include <dcp/raw_convert.h>
+#include <libxml++/libxml++.h>
+#include <boost/thread/mutex.hpp>
 
 #include "i18n.h"
 
 using std::string;
-using std::stringstream;
-using std::set;
 using std::list;
 using std::cout;
 using std::vector;
+using std::max;
 using boost::shared_ptr;
 using dcp::raw_convert;
 
@@ -79,7 +80,7 @@ Content::Content (shared_ptr<const Film> f, boost::filesystem::path p)
        _paths.push_back (p);
 }
 
-Content::Content (shared_ptr<const Film> f, shared_ptr<const cxml::Node> node)
+Content::Content (shared_ptr<const Film> f, cxml::ConstNodePtr node)
        : _film (f)
        , _change_signals_frequent (false)
 {
@@ -87,7 +88,7 @@ Content::Content (shared_ptr<const Film> f, shared_ptr<const cxml::Node> node)
        for (list<cxml::NodePtr>::const_iterator i = path_children.begin(); i != path_children.end(); ++i) {
                _paths.push_back ((*i)->content ());
        }
-       _digest = node->string_child ("Digest");
+       _digest = node->optional_string_child ("Digest").get_value_or ("X");
        _position = DCPTime (node->number_child<double> ("Position"));
        _trim_start = DCPTime (node->number_child<double> ("TrimStart"));
        _trim_end = DCPTime (node->number_child<double> ("TrimEnd"));
@@ -132,11 +133,19 @@ Content::as_xml (xmlpp::Node* node) const
 void
 Content::examine (shared_ptr<Job> job)
 {
+       if (job) {
+               job->sub (_("Computing digest"));
+       }
+       
        boost::mutex::scoped_lock lm (_mutex);
        vector<boost::filesystem::path> p = _paths;
        lm.unlock ();
-       
-       string const d = md5_digest (p, job);
+
+       /* Some content files are very big, so we use a poor's
+          digest here: a MD5 of the first and last 1e6 bytes with the
+          size of the first file tacked on the end as a string.
+       */
+       string const d = md5_digest_head_tail (p, 1000000) + dcp::raw_convert<string> (boost::filesystem::file_size (p.front ()));
 
        lm.lock ();
        _digest = d;
@@ -215,7 +224,7 @@ Content::technical_summary () const
 DCPTime
 Content::length_after_trim () const
 {
-       return full_length() - trim_start() - trim_end();
+       return max (DCPTime (), full_length() - trim_start() - trim_end());
 }
 
 /** @return string which includes everything about how this content affects
@@ -224,7 +233,7 @@ Content::length_after_trim () const
 string
 Content::identifier () const
 {
-       stringstream s;
+       SafeStringStream s;
        
        s << Content::digest()
          << "_" << position().get()
@@ -259,7 +268,7 @@ Content::path_summary () const
 {
        /* XXX: should handle multiple paths more gracefully */
 
-       assert (number_of_paths ());
+       DCPOMATIC_ASSERT (number_of_paths ());
 
        string s = path(0).filename().string ();
        if (number_of_paths() > 1) {