SoundTouch is a very useful set of audio manipulation tools, with three powerful features:<\/p>\n
I used SoundTouch when I was developing CantoVario<\/a>\u00a0under the direction\u00a0of Diana Dabby and using her algorithms for generating new music from existing music, using Lorenz attractors. \u00a0SoundTouch is a C++ library, but CantoVario was in python, so I built a wrapper for it.<\/p>\n Now you can use it too! \u00a0PySoundTouch<\/a>, a python wrapper for the SoundTouch library\u00a0is available on github! \u00a0It’s easy to use, especially with the super-cool AudioReader abstraction that I made with it.<\/p>\n AudioReader provides a single interface to any audio file (currently MP3, WAV, AIF, and AU files are supported). \u00a0Here’s an example of using AudioReader with the SoundTouch library:<\/p>\n SoundTouch is a very useful set of audio manipulation tools, with three powerful features: Adjusting the pitch of a segment, without changing its tempo Adjusting the tempo of a segment, without changing its pitch Detecting the tempo of a segment, using beat detection I used SoundTouch when I was developing CantoVario\u00a0under the direction\u00a0of Diana Dabby … Continue reading Python SoundTouch Wrapper<\/span> \r\n# Open the file and convert it to have SoundTouch's required 2-byte samples\r\nreader = AudioReader.open(srcpath)\r\nreader2 = ConvertReader(reader, set_raw_width=2)\r\n\r\n# Create the SoundTouch object and set the given shift\r\nst = soundtouch.SoundTouch(reader2.sampling_rate(), reader2.channels())\r\nst.set_pitch_shift(shift)\r\n\r\n# Create the .WAV file to write the result to\r\nwriter = wave.open(dstpath, 'w')\r\nwriter.setnchannels(reader2.channels())\r\nwriter.setframerate(reader2.sampling_rate())\r\nwriter.setsampwidth(reader2.raw_width())\r\n\r\n# Read values and feed them into SoundTouch\r\nwhile True:\r\n data = reader2.raw_read()\r\n if not data:\r\n break\r\n\r\n print len(data)\r\n st.put_samples(data)\r\n\r\n while st.ready_count() > 0:\r\n writer.writeframes(st.get_samples(11025))\r\n\r\n# Flush any remaining samples\r\nwaiting = st.waiting_count()\r\nready = st.ready_count()\r\nflushed = ""\r\n\r\n# Add silence until another chunk is pushed out\r\nsilence = array('h', [0] * 64)\r\nwhile st.ready_count() == ready:\r\n st.put_samples(silence)\r\n\r\n# Get all of the additional samples\r\nwhile st.ready_count() > 0:\r\n flushed += st.get_samples(4000)\r\n\r\nst.clear()\r\n\r\nif len(flushed) > 2 * reader2.getnchannels() * waiting:\r\n flushed = flushed[0:(2 * reader2.getnchannels() * waiting)]\r\n\r\nwriter.writeframes(flushed)\r\n\r\n# Clean up\r\nwriter.close()\r\nreader2.close()\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"