Add an output audio matrix (#1482).

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

diff --git a/src/lib/config.cc b/src/lib/config.cc
index 581620f832846f8a2f8e7418478fb43666dbc5ab..7f32320dfb3f49e50fab88d2d20dcee39deb9e8b 100644 (file)
--- a/src/lib/config.cc
+++ b/src/lib/config.cc
@@ -53,6 +53,7 @@ using std::cout;
 using std::ifstream;
 using std::string;
 using std::list;
+using std::min;
 using std::max;
 using std::remove;
 using std::exception;
@@ -173,6 +174,7 @@ Config::set_defaults ()
        _player_content_directory = boost::none;
        _player_playlist_directory = boost::none;
        _player_kdm_directory = boost::none;
+       _audio_mapping = boost::none;
 #ifdef DCPOMATIC_VARIANT_SWAROOP
        _player_background_image = boost::none;
        _kdm_server_url = "http://localhost:8000/{CPL}";
@@ -590,6 +592,11 @@ try
        _player_content_directory = f.optional_string_child("PlayerContentDirectory");
        _player_playlist_directory = f.optional_string_child("PlayerPlaylistDirectory");
        _player_kdm_directory = f.optional_string_child("PlayerKDMDirectory");
+
+       if (f.optional_node_child("AudioMapping")) {
+               _audio_mapping = AudioMapping (f.node_child("AudioMapping"), Film::current_state_version);
+       }
+
 #ifdef DCPOMATIC_VARIANT_SWAROOP
        _player_background_image = f.optional_string_child("PlayerBackgroundImage");
        _kdm_server_url = f.optional_string_child("KDMServerURL").get_value_or("http://localhost:8000/{CPL}");
@@ -1037,6 +1044,9 @@ Config::write_config () const
                /* [XML] PlayerKDMDirectory Directory to use for player KDMs in the dual-screen mode. */
                root->add_child("PlayerKDMDirectory")->add_child_text(_player_kdm_directory->string());
        }
+       if (_audio_mapping) {
+               _audio_mapping->as_xml (root->add_child("AudioMapping"));
+       }
 #ifdef DCPOMATIC_VARIANT_SWAROOP
        if (_player_background_image) {
                root->add_child("PlayerBackgroundImage")->add_child_text(_player_background_image->string());
@@ -1395,3 +1405,53 @@ Config::have_write_permission () const
        fclose (f);
        return true;
 }
+
+/** @param  output_channels Number of output channels in use.
+ *  @return Audio mapping for this output channel count (may be a default).
+ */
+AudioMapping
+Config::audio_mapping (int output_channels)
+{
+       if (!_audio_mapping || _audio_mapping->output_channels() != output_channels) {
+               /* Set up a default */
+               _audio_mapping = AudioMapping (MAX_DCP_AUDIO_CHANNELS, output_channels);
+               if (output_channels == 2) {
+                       /* Special case for stereo output.
+                          Map so that Lt = L(-3dB) + Ls(-3dB) + C(-6dB) + Lfe(-10dB)
+                          Rt = R(-3dB) + Rs(-3dB) + C(-6dB) + Lfe(-10dB)
+                       */
+                       _audio_mapping->set (dcp::LEFT,   0, 1 / sqrt(2));  // L   -> Lt
+                       _audio_mapping->set (dcp::RIGHT,  1, 1 / sqrt(2));  // R   -> Rt
+                       _audio_mapping->set (dcp::CENTRE, 0, 1 / 2.0);      // C   -> Lt
+                       _audio_mapping->set (dcp::CENTRE, 1, 1 / 2.0);      // C   -> Rt
+                       _audio_mapping->set (dcp::LFE,    0, 1 / sqrt(10)); // Lfe -> Lt
+                       _audio_mapping->set (dcp::LFE,    1, 1 / sqrt(10)); // Lfe -> Rt
+                       _audio_mapping->set (dcp::LS,     0, 1 / sqrt(2));  // Ls  -> Lt
+                       _audio_mapping->set (dcp::RS,     1, 1 / sqrt(2));  // Rs  -> Rt
+               } else {
+                       /* 1:1 mapping */
+                       for (int i = 0; i < min (MAX_DCP_AUDIO_CHANNELS, output_channels); ++i) {
+                               _audio_mapping->set (i, i, 1);
+                       }
+               }
+       }
+
+       return *_audio_mapping;
+}
+
+void
+Config::set_audio_mapping (AudioMapping m)
+{
+       _audio_mapping = m;
+       changed (AUDIO_MAPPING);
+}
+
+void
+Config::set_audio_mapping_to_default ()
+{
+       DCPOMATIC_ASSERT (_audio_mapping);
+       int const ch = _audio_mapping->output_channels ();
+       _audio_mapping = boost::none;
+       _audio_mapping = audio_mapping (ch);
+       changed (AUDIO_MAPPING);
+}