Write MCA tags based on the specified sound field.

I had previously assumed that one should write MCA information into
the sound MXF based on what channels actually contain sound rather
than silence.

However a previous example of a stereo DCP gives a verification error
in EasyDCP (see DoM bug #1935) which is solved by adding MCA tags
for each channel in the specified sound field (e.g. at least 6 tags
for a file which is marked as 5.1) even if the audio is really stereo.

This commit removes the "active channels" stuff and makes sure
that if we say a file is 5.1 we write at least 6 MCA tags (and
similarly for 7.1).

1 files changed, 1 insertions, 3 deletions

diff --git a/src/sound_asset_writer.h b/src/sound_asset_writer.h
index d2eba024..b024749f 100644
--- a/src/sound_asset_writer.h
+++ b/src/sound_asset_writer.h
@@ -78,7 +78,7 @@ private:
 	friend class SoundAsset;
 	friend struct ::sync_test1;
 
-	SoundAssetWriter (SoundAsset *, boost::filesystem::path, std::vector<Channel> active_channels, bool sync);
+	SoundAssetWriter (SoundAsset *, boost::filesystem::path, bool sync);
 
 	void start ();
 	void write_current_frame ();
@@ -99,8 +99,6 @@ private:
 	/** index of the sync packet (0-3) which starts the next edit unit */
 	int _sync_packet = 0;
 	FSK _fsk;
-
-	std::vector<Channel> _active_channels;
 };
 
 }