1 files changed, 61 insertions, 0 deletions
diff --git a/power_sequencer/operators/audiosync/convert_and_trim.py b/power_sequencer/operators/audiosync/convert_and_trim.py
new file mode 100644
index 00000000..1ce1a4c1
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+++ b/power_sequencer/operators/audiosync/convert_and_trim.py
@@ -0,0 +1,61 @@
+#
+# Copyright (C) 2016-2019 by Nathan Lovato, Daniel Oakey, Razvan Radulescu, and contributors
+#
+# This file is part of Power Sequencer.
+#
+# Power Sequencer is free software: you can redistribute it and/or modify it under the terms of the
+# GNU General Public License as published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# Power Sequencer is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+# without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with Power Sequencer. If
+# not, see <https://www.gnu.org/licenses/>.
+#
+import os
+import subprocess
+import tempfile
+
+
+def convert_and_trim(audio_filepath, freq, dur):
+    """
+    Uses ffmpeg to convert an audio file to a temporary wav file for use
+    in finding offset.
+
+    Args
+        :audio: path to the audiofile to convert (string)
+        :freq:  Samples / second in the output wav (int)
+        :dur:   Max duration of the output wav in seconds (float)
+
+    Returns
+        :outpath: path to the output wav file
+    """
+
+    tmp = tempfile.NamedTemporaryFile(mode="r+b", prefix="offset_", suffix=".wav")
+    outpath = tmp.name
+    tmp.close()
+
+    channel_count = "1"
+
+    subprocess.call(
+        [
+            "ffmpeg",
+            "-loglevel",
+            "panic",
+            "-i",
+            audio_filepath,
+            "-ac",
+            channel_count,
+            "-ar",
+            str(freq),
+            "-t",
+            str(dur),
+            "-acodec",
+            "pcm_s16le",
+            outpath,
+        ]
+    )
+
+    return outpath