From 37eae22446feb5a805d9cd59f6ad54362829189f Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Wed, 28 Jan 2015 07:44:05 +0000
Subject: player: support the "trim" parameter

This feature is intended to allow users to "zoom-in" on a
particular portion of a track to tweak parameters (either
with dtas-sourceedit(1) or via playback of splitfx YAML files).
This may be combined with looping the tracklist
(via "tl repeat").
---
 lib/dtas/source/file.rb | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

(limited to 'lib/dtas/source/file.rb')

diff --git a/lib/dtas/source/file.rb b/lib/dtas/source/file.rb
index 8a9fa34..75b4a43 100644
--- a/lib/dtas/source/file.rb
+++ b/lib/dtas/source/file.rb
@@ -21,17 +21,18 @@ module DTAS::Source::File # :nodoc:
   FILE_SIVS = %w(infile comments command env) # for the "current" command
   SRC_SIVS = %w(command env tryorder)
 
-  def source_file_dup(infile, offset)
+  def source_file_dup(infile, offset, trim)
     rv = dup
-    rv.__file_init(infile, offset)
+    rv.__file_init(infile, offset, trim)
     rv
   end
 
-  def __file_init(infile, offset)
+  def __file_init(infile, offset, trim)
     @env = @env.dup
     @format = nil
     @infile = infile
     @offset = offset
+    @trim = trim
     @comments = nil
     @samples = nil
     @cuebp = nil
@@ -47,6 +48,13 @@ module DTAS::Source::File # :nodoc:
   # returns any offset in samples (relative to the original source file),
   # likely zero unless seek was used
   def offset_samples
+    off = __offset_samples
+    return off unless @trim
+    tbeg = @trim[0] * format.rate
+    tbeg < off ? off : tbeg
+  end
+
+  def __offset_samples
     return 0 unless @offset
     case @offset
     when /\A\d+s\z/
@@ -56,6 +64,16 @@ module DTAS::Source::File # :nodoc:
     end
   end
 
+  # creates the effect to fill the TRIMFX env
+  def trimfx
+    return unless @offset || @trim
+    fx = "trim #{offset_samples}s"
+    if @trim && @trim[1]
+      fx << sprintf(' =%0.9gs', (@trim[0] + @trim[1]) * format.rate)
+    end
+    fx
+  end
+
   # A user may be downloading the file and start playing
   # it before the download completes, this refreshes
   def samples!
-- 
cgit v1.2.3-24-ge0c7