combine-voice-tracks

scripts/combine-voice-tracks.py

@@ -0,0 +1,94 @@
+#! /usr/bin/env python
+# pip install -r requirements.txt
+usage = 'python combine--json.py <cut-voice-track json files...>'
+
+import util
+import json
+import sys
+from numpy import vstack
+from scipy.io import wavfile
+import wave
+import string
+try:
+    from getch import getch
+except:
+    from msvcrt import getwch as getch
+from os.path import exists
+from os import system
+system('color')
+
+json_filenames = util.args(1, usage)
+if '-cut0.json' not in json_filenames[0]:
+    print('failing to generate a combined filename because args do not start with cut0 file')
+    sys.exit(1)
+new_filename = json_filenames[0].replace("-cut0.json", "-combined")
+
+new_data=None
+new_json=None
+framerate=None
+
+file_start_time = 0
+def offset(element):
+    obj = {
+        "start": element["start"] + file_start_time,
+        "end": element["end"] + file_start_time
+    }
+    if "alts" in element:
+        obj["alts"] = list(map(offset, element["alts"]))
+    return obj
+
+def combine(element1, element2):
+    alts = []
+    if "alts" in element1:
+        alts = element1["alts"]
+    alts.append({
+        "start": element2["start"],
+        "end": element2["end"]
+    })
+    alts = alts + element2["alts"]
+    return {
+        "start": element1["start"],
+        "end": element1["end"],
+        "alts": alts
+    }
+
+for json_filename in json_filenames:
+    timestamps = {}
+    with open(json_filename, 'r') as f:
+        timestamps = json.load(f)
+
+    wav_filename = json_filename.replace(".json", ".wav")
+    wav = None
+    with open(wav_filename, 'rb') as f:
+        wav = wave.open(f)
+
+    nchannels, sampwidth, framerate, nframes, comptype, compname = wav.getparams()
+
+    _, data = wavfile.read(wav_filename)
+
+    if new_data is None:
+        new_data = data
+        new_json = timestamps
+    else:
+        new_data = vstack((new_data, data))
+        for key, element in timestamps.items():
+            element = offset(element)
+            if key in new_json:
+                combined = combine(new_json[key], element)
+                new_json[key] = combined
+            else:
+                new_json[key] = element
+
+    # Collect the new time offset for the next file's timestamps
+    for _, element in timestamps.items():
+        end = element["end"]
+        if "alts" in element:
+            end = element["alts"][-1]["end"]
+        if end > file_start_time:
+            file_start_time = end
+
+new_wav = new_filename + ".wav"
+wavfile.write(new_wav, framerate, new_data)
+with open(new_wav.replace(".wav", ".json"), 'w') as f:
+    json.dump(new_json, f)
+sys.exit(0)