Charming Snake

# Charming Snake

## Python for Live Music

.br[
[![Matthieu Amiguet](pics/ma.png)](http://www.matthieuamiguet.ch/)   
[![Les Chemins de Traverse](pics/logo-small.png)](http://www.lescheminsdetraverse.net/)
]

---

![Les Chemins de Traverse](pics/logo.png)

---

---

---

# From Renaissance Repertoire...

<video controls>
  <source src="vid/flow_extract.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>

.right[
- (From the DVD [Old Wine in New Bottles](http://www.lescheminsdetraverse.net/pages/commande/))
]

---

# ... To Free Improvisation

<video controls>
  <source src="vid/impro_extract.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>

.right[
- (From the DVD [Old Wine in New Bottles](http://www.lescheminsdetraverse.net/pages/commande/))
]

---

# Augmented instruments

## "Extending the sonic possibilities of traditional <br>music instruments using new technologies."

---

# Guidelines

## Music first

## An augmented instrument is a musical instrument

## History Matters

## Durability and independence

---

# How does it sound?

.right[
- (From the DVD [Old Wine in New Bottles](http://www.lescheminsdetraverse.net/pages/commande/))
]

---

## To explore augmented instruments we need:

# A quick way to build prototypes of <br>realtime, ultra-low latency programs

---

# Possible Solutions

## Using existing software
## Writing realtime C / C++
## Visual programming environments
## Domain-specific programming languages
## Libraries for general-purpose programming languages

---
# Possible Solutions

## .highlight[Using existing software]
## Writing realtime C / C++
## Visual programming environments
## Domain-specific programming languages
## Libraries for general-purpose programming languages

---

![Guitarix](pics/guitarix.jpg)

![Sooperlooper](pics/sooperlooper.png)

---

# Possible Solutions

## Using existing software
## .highlight[Writing realtime C / C++]
## Visual programming environments
## Domain-specific programming languages
## Libraries for general-purpose programming languages

---

# "Audio Thru " in C (with jack)

```C
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

#include <jack/jack.h>

jack_port_t *input_port;
jack_port_t *output_port;

int process (jack_nframes_t nframes, void *arg) {
        jack_default_audio_sample_t *out = \
            (jack_default_audio_sample_t *) jack_port_get_buffer (output_port, nframes);
        jack_default_audio_sample_t *in = \
            (jack_default_audio_sample_t *) jack_port_get_buffer (input_port, nframes);

memcpy (out, in, sizeof (jack_default_audio_sample_t) * nframes);
        
        return 0;      
  }

// add many more lines ```

---

# Possible Solutions

## Using existing software
## Writing realtime C / C++
## .highlight[Visual programming environments]
## Domain-specific programming languages
## Libraries for general-purpose programming languages

---

# " Audio Thru " in PureData

![Simplistic pd patch](pics/pd-simple.jpg)

---

# PureData in Real Life

![Real life pd patch](pics/pd-real.jpg)

---

---

# Possible Solutions

## Using existing software
## Writing realtime C / C++
## Visual programming environments
## .highlight[Domain-specific programming languages]
## Libraries for general-purpose programming languages

---

# " Audio Thru " in ChucK

```C
adc => dac;

while( true )
{
    100::ms => now;
}```

# " Audio Thru " in Faust

```C
process = _;```

## Don't forget SuperCollider, CSound, ...

---

# Possible Solutions

## Using existing software
## Writing realtime C / C++
## Visual programming environments
## Domain-specific programming languages
## .highlight[Libraries for general-purpose programming languages]

---

![Real life pd patch](pics/pyohome.jpg)

## http://ajaxsoundstudio.com/software/pyo/

---

# " Audio Thru " in python/pyo

```python
import pyo
s = pyo.Server().boot()
i= pyo.Input().out()
s.gui(locals())```

## On a properly configured computer...

### (for us: linux with rt-patched kernel and jackd running)

## ... this is all you need to get a reliable ultra-low latency audio treatment

### (for us: roundtrip latency < 10ms)

---

## Backstage

---

# In The Swiss Mountains...

```python
import pyo

server = pyo.Server(audio='jack', nchnls=1, duplex=1)
server.boot().start()

server.gui()```

---

# In The Swiss Mountains...

```python
import pyo

server = pyo.Server(audio='jack', nchnls=1, duplex=1)
server.boot().start()

*i = pyo.Input().out()

server.gui()```

---

# In The Swiss Mountains...

```python
import pyo

server = pyo.Server(audio='jack', nchnls=1, duplex=1)
server.boot().start()

i = pyo.Input().out()

*reverb = pyo.Freeverb(i, size=.8, damp=1, bal=1, mul=.8).out()

server.gui()```

---

# In The Swiss Mountains...

```python
import pyo

server = pyo.Server(audio='jack', nchnls=1, duplex=1)
server.boot().start()

i = pyo.Input().out()

reverb = pyo.Freeverb(i, size=.8, damp=1, bal=1, mul=.8).out()

*delay = pyo.Delay(i, delay=[1, 1.1, 1.2], maxdelay=5, feedback=.2, mul=.2) # no out here!

server.gui()```

---

# In The Swiss Mountains...

```python
import pyo

server = pyo.Server(audio='jack', nchnls=1, duplex=1)
server.boot().start()

i = pyo.Input().out()

reverb = pyo.Freeverb(i, size=.8, damp=1, bal=1, mul=.8).out()

delay = pyo.Delay(i, delay=[1, 1.1, 1.2], maxdelay=5, feedback=.2, mul=.2)
*echos = pyo.Freeverb(delay, size=.5, damp=1, bal=1, mul=.8).out()

server.gui()```

---

# Chilbi

<audio controls>
  <source src="sounds/chilbi.mp3" type="audio/mpeg">
Your browser does not support the audio element.
</audio>

---

# Playing Canons

## (Using foococo for accessing the foot controller)

```python
i = pyo.Input()
b1 = foococo.Press(foococo.Button(1)).trig
ti = pyo.Timer(b1,b1)
d = pyo.SDelay(i, delay=ti, maxdelay=30).out()```

---

# Telemann, Canons Mélodieux (written in 1738)

<audio controls>
  <source src="sounds/TelemannCanon.mp3" type="audio/mpeg">
Your browser does not support the audio element.
</audio>

---

# Polyrythms

```python
tab_percu = pyo.NewTable(15)
rec_percu = pyo.TableRec(src, tab_percu)
play_percu = pyo.Looper(
                      tab_percu,
                      dur=rec_percu['time'] / server.getSamplingRate(),
                      xfade=0,
                      pitch=[.5,1,.25]
                ).stop()

# Record simple rythm
rec_percu.play()

# Stop recording
rec_percu.stop()

# Play polyrythm
play_percu.out()```

---

# Voice Drone

```python
play_voice = pyo.Looper(
    tab_voice, 
    dur=rec_voice['time'] / server.getSamplingRate(), 
    xfade=[50,43] 
).out()
```

![xfaders](pics/xfaders.jpg)

---

# Time and transitions

```python
def start():

Glob.sm = StateMachine()
    
    tab_percu = pyo.NewTable(15)
    Glob.rec_percu = pyo.TableRec(Glob.src, tab_percu)
    Glob.play_percu = pyo.Looper(...)
    #...
    
    Glob.sm.transitions(
        {fc.Press(fc.Button(1)).trig: rec_percu}
    )

def rec_percu():

Glob.rec_percu.play()
    
    Glob.transitions(
        {fc.Press(fc.Button(1)).trig: stop_rec_percu}
    )
    
# ...
```
---

# Traces d'Orient

<audio controls>
  <source src="sounds/orient.mp3" type="audio/mpeg">
Your browser does not support the audio element.
</audio>

---

# Sound-controlled Wah effect

```python
bass = pyo.Input(chnl=1)
control = pyo.Input(chnl=2)
fol = pyo.Follower(control, freq=30, mul=40000, add=200)
f = pyo.Biquad(bass, freq=fol, q=5, type=2, mul=10).out()```

---

# Why reinvent the wheel?

## SooperLooper does loops sooo well...

```python
def loop_state(address, *args):

# args is loop_index, control, value
  state = args[2]
    
  if state > 0:
    Glob.running = True

get_state = OscDataReceive(9901, '/loop_state', loop_state)

register = OscDataSend('siss', 9951, '/sl/0/register_auto_update')
register.send(['state',100,'localhost:9901', '/loop_state'])
```

---

# Putting it all together

---

# Snaking

# Around

<audio controls>
  <source src="sounds/SnakinAround.mp3" type="audio/mpeg">
Your browser does not support the audio element.
</audio>

---

# Conclusion

## pyo really supports our creative process

## All the flexibility of python with C efficiency

## Python in a very unexpected domain with pyo

## pyo is very actively developed

---

# Questions?

- [www.lescheminsdetraverse.net](http://www.lescheminsdetraverse.net)
- [www.matthieuamiguet.ch](http://www.matthieuamiguet.ch)
- [www.augmented-instruments.net](http://www.augmented-instruments.net)
- [twitter](https://twitter.com/#!/MatthieuAmiguet)/[facebook](https://www.facebook.com/MatthieuAmiguet): MatthieuAmiguet

## <br>Picture Credits

- title picture based on a [picture](https://www.flickr.com/photos/aftab/5331047355/in/photolist-9861Dz-5o8KMm-gpVt7-anbBmx-4AJSjR-jpCns1-jq1uQm-ooe2vz-dqfzt7-4XmXPt-DrHHs-5J34R7-2iCxSP-3Kyyzj-4ekRTt-yugxu-5wsnWj-5UrpWL-e5sXHe-axQCuK-eifRwS-ckijZh-nVPTN8-bCuxqG-4AJSyB-48dkLQ-9qDHoF-9d51Dz-7jG424-dVKrNK-4FQYWg-4tJYEf-9cCZn3-7Yiqfb-tza45t-GoqQV-sxgBFC-8TroK7-kWoKpk-2CUEHG-8Tna46-bMHfVM-7KWfHa-7Qj23F-63tHwW-86PR6C-7gVbbt-86PRcW-7ErC2D-2duLk3) by Aftab Uzzaman
- PureData Patch by [Julien Ottavi](http://www.apo33.org/noise/doku.php?id=puredata)
- Spaghetti by [I Believe I can Fry](https://www.flickr.com/photos/johnnystiletto/9521494467/in/photolist-fvo9zH-7C5KJq-9spjhF-7C5S1J-e8aChq-eFuVF5-8s8eBL-7C6gkd-8unyFa-7GVMym-8AeF8A-7Jq8bA-7v58RC-8y4joe-5K9nBF-2M77nV-tbvq4r-et54Ce-67wNj5-9FDGTz-9Kqgpe-8hDjTF-8uqFJ5-cFhrPj-e78ZLP-dzGXYU-5uek9M-q6HBB8-7C1YXT-4j7TzA-nEu9Ds-47fYur-6Y1oaq-6Y1nZ9-3rbv36-7C43rW-4nTCCe-58r1VP-88w1ie-7C5KrW-e7SsgU-6Y1nTS-6xL3SF-iaESNy-8jaH2a-4Z6933-7C5Nmh-bBLAoW-aAe8yN-3TXpok)
- Music pictures (still & moving) by [Nicolas Meyer](http://nicolas-meyer.ch/)