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[casparcg] / core / video_format.cpp

diff --git a/core/video_format.cpp b/core/video_format.cpp
index bea44730618902287a47c45dce77c0992b68d618..4cb31290296580b938cd266a2effee4d88e47776 100644 (file)
--- a/core/video_format.cpp
+++ b/core/video_format.cpp
@@ -137,5 +137,53 @@ std::wostream& operator<<(std::wostream& out, const video_format_desc& format_de
        return out;
 }
 
+std::vector<int> find_audio_cadence(const boost::rational<int>& framerate, bool log_quiet)
+{
+       static std::map<boost::rational<int>, std::vector<int>> CADENCES_BY_FRAMERATE = []
+       {
+               std::map<boost::rational<int>, std::vector<int>> result;
+
+               for (core::video_format format : enum_constants<core::video_format>())
+               {
+                       core::video_format_desc desc(format);
+                       boost::rational<int> format_rate(desc.time_scale, desc.duration);
+
+                       result.insert(std::make_pair(format_rate, desc.audio_cadence));
+               }
+
+               return result;
+       }();
+
+       auto exact_match = CADENCES_BY_FRAMERATE.find(framerate);
+
+       if (exact_match != CADENCES_BY_FRAMERATE.end())
+               return exact_match->second;
+
+       boost::rational<int> closest_framerate_diff     = std::numeric_limits<int>::max();
+       boost::rational<int> closest_framerate          = 0;
+
+       for (auto format_framerate : CADENCES_BY_FRAMERATE | boost::adaptors::map_keys)
+       {
+               auto diff = boost::abs(framerate - format_framerate);
+
+               if (diff < closest_framerate_diff)
+               {
+                       closest_framerate_diff = diff;
+                       closest_framerate = format_framerate;
+               }
+       }
+
+       if (log_quiet)
+               CASPAR_LOG(debug) << "No exact audio cadence match found for framerate " << to_string(framerate)
+                       << "\nClosest match is " << to_string(closest_framerate)
+                       << "\nwhich is a " << to_string(closest_framerate_diff) << " difference.";
+       else
+               CASPAR_LOG(warning) << "No exact audio cadence match found for framerate " << to_string(framerate)
+                       << "\nClosest match is " << to_string(closest_framerate)
+                       << "\nwhich is a " << to_string(closest_framerate_diff) << " difference.";
+
+       return CADENCES_BY_FRAMERATE[closest_framerate];
+}
+
 
 }}