From dad4c3cb55224c8047344a9bb5bcefc2e4b23105 Mon Sep 17 00:00:00 2001
From: Karl Kroening <karlk@kralnet.us>
Date: Mon, 15 Jan 2018 22:18:19 -0800
Subject: [PATCH] Add `--min-chunk-time` in split_silence example

---
 examples/split_silence.py | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/examples/split_silence.py b/examples/split_silence.py
index 0234532..a83e5f4 100755
--- a/examples/split_silence.py
+++ b/examples/split_silence.py
@@ -2,6 +2,7 @@
 from __future__ import unicode_literals
 
 import argparse
+import copy
 import errno
 import ffmpeg
 import json
@@ -27,6 +28,7 @@ parser.add_argument('--silence-duration', default=DEFAULT_DURATION, type=float,
 parser.add_argument('--start-time', type=float, help='Start time (seconds)')
 parser.add_argument('--end-time', type=float, help='End time (seconds)')
 parser.add_argument('--padding', type=float, default=0., help='Output silence padding (seconds)')
+parser.add_argument('--min-chunk-time', type=float, default=0., help='Minimum chunk duration')
 parser.add_argument('--metadata-filename', help='Optional metadata output file')
 parser.add_argument('-v', dest='verbose', action='store_true', help='Verbose mode')
 
@@ -108,6 +110,22 @@ def _makedirs(path):
             raise
 
 
+def combine_chunks(chunk_times, min_chunk_time):
+    chunk_times = copy.copy(chunk_times)
+    pop_chunk = lambda chunk_times: (chunk_times[0][0], chunk_times[0][1], chunk_times[1:])
+    new_chunk_times = []
+    while len(chunk_times) != 0:
+        # Start new chunk.
+        start_time, end_time, chunk_times = pop_chunk(chunk_times)
+        time = end_time - start_time
+        while time < min_chunk_time and len(chunk_times) != 0:
+            # Combine with next chunk.
+            _, end_time, chunk_times = pop_chunk(chunk_times)
+            time = end_time - start_time
+        new_chunk_times.append((start_time, end_time))
+    return new_chunk_times
+
+
 def split_audio(
     in_filename,
     out_pattern,
@@ -116,10 +134,13 @@ def split_audio(
     start_time=None,
     end_time=None,
     padding=0.,
+    min_chunk_time=0.,
     metadata_filename=None,
     verbose=False,
 ):
     chunk_times = get_chunk_times(in_filename, silence_threshold, silence_duration, start_time, end_time)
+    if min_chunk_time > 0.:
+        chunk_times = combine_chunks(chunk_times, min_chunk_time)
 
     metadata = []
     for i, (start_time, end_time) in enumerate(chunk_times):