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-rw-r--r--lib/dtas/splitfx.rb20
1 files changed, 17 insertions, 3 deletions
diff --git a/lib/dtas/splitfx.rb b/lib/dtas/splitfx.rb
index 1150ee0..b94f54b 100644
--- a/lib/dtas/splitfx.rb
+++ b/lib/dtas/splitfx.rb
@@ -66,6 +66,7 @@ class DTAS::SplitFX # :nodoc:
   # $CHANNELS (input)
   # $BITS_PER_SAMPLE (input)
   def initialize
+    @tshift = 0
     @env = {}
     @comments = {}
     @track_start = 1
@@ -290,7 +291,7 @@ class DTAS::SplitFX # :nodoc:
       start_time = argv.shift
       title = argv.shift
       t = T.new
-      t.tbeg = @t2s.call(start_time)
+      t.tbeg = @t2s.call(start_time) + @tshift
       t.comments = @comments.dup
       title.valid_encoding? or warn "#{title.inspect} encoding invalid"
       t.comments["TITLE"] = title
@@ -311,11 +312,24 @@ class DTAS::SplitFX # :nodoc:
 
       prev = @tracks.last and prev.commit(t.tbeg)
       @tracks << t
+    when 'tshift'
+      tshift = argv.shift
+      argv.empty? or raise ArgumentError, 'tshift does not take extra args'
+      if tshift.sub!(/\A-=/, '')
+        @tshift = @tshift - @t2s.call(tshift)
+      elsif tshift.sub!(/\A\+=/, '')
+        @tshift = @tshift + @t2s.call(tshift)
+      elsif tshift.sub!(/\A-/, '')
+        @tshift = -@t2s.call(tshift)
+      else
+        tshift.sub!(/\A\+/, '')
+        @tshift = @t2s.call(tshift)
+      end
     when "skip"
       stop_time = argv.shift
       argv.empty? or raise ArgumentError, "skip does not take extra args"
       s = Skip.new
-      s.tbeg = @t2s.call(stop_time)
+      s.tbeg = @t2s.call(stop_time) + @tshift
       # s.comments = {}
       # s.env = {}
       prev = @tracks.last or raise ArgumentError, "no tracks to skip"
@@ -324,7 +338,7 @@ class DTAS::SplitFX # :nodoc:
     when "stop"
       stop_time = argv.shift
       argv.empty? or raise ArgumentError, "stop does not take extra args"
-      samples = @t2s.call(stop_time)
+      samples = @t2s.call(stop_time) + @tshift
       prev = @tracks.last and prev.commit(samples)
     else
       raise ArgumentError, "unknown command: #{xs(cmd)}"