itl_chorus/client.py

# A simple client that generates sine waves via python-pyaudio

import signal
import pyaudio
import sys
import socket
import time
import math
import struct
import socket
import optparse
import array
import random
import threading

from packet import Packet, CMD, stoi

parser = optparse.OptionParser()
parser.add_option('-t', '--test', dest='test', action='store_true', help='Play a test sequence (440,<rest>,880,440), then exit')
parser.add_option('-g', '--generator', dest='generator', default='math.sin', help='Set the generator (to a Python expression)')
parser.add_option('--generators', dest='generators', action='store_true', help='Show the list of generators, then exit')
parser.add_option('-u', '--uid', dest='uid', default='', help='Set the UID (identifier) of this client in the network')
parser.add_option('-p', '--port', dest='port', type='int', default=13676, help='Set the port to listen on')
parser.add_option('-r', '--rate', dest='rate', type='int', default=44100, help='Set the sample rate of the audio device')
parser.add_option('-V', '--volume', dest='volume', type='float', default=1.0, help='Set the volume factor (>1 distorts, <1 attenuates)')
parser.add_option('-G', '--gui', dest='gui', default='', help='set a GUI to use')

options, args = parser.parse_args()

PORT = options.port
STREAMS = 1
IDENT = 'TONE'
UID = options.uid

LAST_SAMP = 0
LAST_SAMPLES = []
FREQ = 0
PHASE = 0
RATE = options.rate
FPB = 64

Z_SAMP = '\x00\x00\x00\x00'
MAX = 0x7fffffff
AMP = MAX
MIN = -0x80000000

def lin_interp(frm, to, p):
    return p*to + (1-p)*frm

# GUIs

GUIs = {}

def GUI(f):
    GUIs[f.__name__] = f
    return f

@GUI
def pygame_notes():
    import pygame
    import pygame.gfxdraw
    pygame.init()

    SAMP_WIDTH = 512
    BGR_WIDTH = 512
    HEIGHT = 1024

    disp = pygame.display.set_mode((SAMP_WIDTH + BGR_WIDTH, HEIGHT))

    WIDTH, HEIGHT = disp.get_size()
    SAMP_WIDTH = WIDTH / 2
    BGR_WIDTH = WIDTH - SAMP_WIDTH
    PFAC = HEIGHT / 128.0

    sampwin = pygame.Surface((SAMP_WIDTH, HEIGHT))
    lastsy = HEIGHT / 2

    clock = pygame.time.Clock()

    while True:
        if FREQ > 0:
            try:
                pitch = 12 * math.log(FREQ / 440.0, 2) + 69
            except ValueError:
                pitch = 0
        else:
            pitch = 0
        col = [int((AMP / MAX) * 255)] * 3

        disp.fill((0, 0, 0), (BGR_WIDTH, 0, SAMP_WIDTH, HEIGHT))
        disp.scroll(-1, 0)
        disp.fill(col, (BGR_WIDTH - 1, HEIGHT - pitch * PFAC - PFAC, 1, PFAC))

        sampwin.scroll(-len(LAST_SAMPLES), 0)
        x = max(0, SAMP_WIDTH - len(LAST_SAMPLES))
        sampwin.fill((0, 0, 0), (x, 0, SAMP_WIDTH - x, HEIGHT))
        for i in LAST_SAMPLES:
            sy = int((float(i) / MAX) * (HEIGHT / 2) + (HEIGHT / 2))
            pygame.gfxdraw.line(sampwin, x - 1, lastsy, x, sy, (0, 255, 0))
            x += 1
            lastsy = sy
        del LAST_SAMPLES[:]
        #w, h = SAMP_WIDTH, HEIGHT
        #pts = [(BGR_WIDTH, HEIGHT / 2), (w + BGR_WIDTH, HEIGHT / 2)]
        #x = w + BGR_WIDTH
        #for i in reversed(LAST_SAMPLES):
        #    pts.insert(1, (x, int((h / 2) + (float(i) / MAX) * (h / 2))))
        #    x -= 1
        #    if x < BGR_WIDTH:
        #        break
        #if len(pts) > 2:
        #    pygame.gfxdraw.aapolygon(disp, pts, [0, 255, 0])
        disp.blit(sampwin, (BGR_WIDTH, 0))
        pygame.display.flip()

        for i in pygame.event.get():
            pass  # Todo

        clock.tick(60)

# Generator functions--should be cyclic within [0, 2*math.pi) and return [-1, 1]

GENERATORS = [{'name': 'math.sin', 'args': None, 'desc': 'Sine function'},
        {'name':'math.cos', 'args': None, 'desc': 'Cosine function'}]

def generator(desc=None, args=None):
    def inner(f, desc=desc, args=args):
        if desc is None:
            desc = f.__doc__
        GENERATORS.append({'name': f.__name__, 'desc': desc, 'args': args})
        return f
    return inner

@generator('Simple triangle wave (peaks/troughs at pi/2, 3pi/2)')
def tri_wave(theta):
    if theta < math.pi/2:
        return lin_interp(0, 1, theta/(math.pi/2))
    elif theta < 3*math.pi/2:
        return lin_interp(1, -1, (theta-math.pi/2)/math.pi)
    else:
        return lin_interp(-1, 0, (theta-3*math.pi/2)/(math.pi/2))

@generator('Simple square wave (piecewise 1 at x<pi, 0 else)')
def square_wave(theta):
    if theta < math.pi:
        return 1
    else:
        return -1

@generator('Random (noise) generator')
def noise(theta):
    return random.random() * 2 - 1

@generator('File generator', '(<file>[, <bits=8>[, <signed=True>[, <0=linear interp (default), 1=nearest>[, <swapbytes=False>]]]])')
class file_samp(object):
    LINEAR = 0
    NEAREST = 1
    TYPES = {8: 'B', 16: 'H', 32: 'L'}
    def __init__(self, fname, bits=8, signed=True, samp=LINEAR, swab=False):
        tp = self.TYPES[bits]
        if signed:
            tp = tp.lower()
        self.max = float((2 << bits) - 1)
        self.buffer = array.array(tp)
        self.buffer.fromstring(open(fname, 'rb').read())
        if swab:
            self.buffer.byteswap()
        self.samp = samp
    def __call__(self, theta):
        norm = theta / (2*math.pi)
        if self.samp == self.LINEAR:
            v = norm*len(self.buffer)
            l = int(math.floor(v))
            h = int(math.ceil(v))
            if l == h:
                return self.buffer[l]/self.max
            if h >= len(self.buffer):
                h = 0
            return lin_interp(self.buffer[l], self.buffer[h], v-l)/self.max
        elif self.samp == self.NEAREST:
            return self.buffer[int(math.ceil(norm*len(self.buffer) - 0.5))]/self.max

@generator('Harmonics generator (adds overtones at f, 2f, 3f, 4f, etc.)', '(<generator>, <amplitude of f>, <amp 2f>, <amp 3f>, ...)')
class harmonic(object):
    def __init__(self, gen, *spectrum):
        self.gen = gen
        self.spectrum = spectrum
    def __call__(self, theta):
        return max(-1, min(1, sum([amp*self.gen((i+1)*theta % (2*math.pi)) for i, amp in enumerate(self.spectrum)])))

@generator('Mix generator', '(<generator>[, <amp>], [<generator>[, <amp>], [...]])')
class mixer(object):
    def __init__(self, *specs):
        self.pairs = []
        i = 0
        while i < len(specs):
            if i+1 < len(specs) and isinstance(specs[i+1], (float, int)):
                pair = (specs[i], specs[i+1])
                i += 2
            else:
                pair = (specs[i], None)
                i += 1
            self.pairs.append(pair)
        tamp = 1 - min(1, sum([amp for gen, amp in self.pairs if amp is not None]))
        parts = float(len([None for gen, amp in self.pairs if amp is None]))
        for idx, pair in enumerate(self.pairs):
            if pair[1] is None:
                self.pairs[idx] = (pair[0], tamp / parts)
    def __call__(self, theta):
        return max(-1, min(1, sum([amp*gen(theta) for gen, amp in self.pairs])))

@generator('Phase offset generator (in radians; use math.pi)', '(<generator>, <offset>)')
class phase_off(object):
    def __init__(self, gen, offset):
        self.gen = gen
        self.offset = offset
    def __call__(self, theta):
        return self.gen((theta + self.offset) % (2*math.pi))

if options.generators:
    for item in GENERATORS:
        print item['name'],
        if item['args'] is not None:
            print item['args'],
        print '--', item['desc']
    exit()

#generator = math.sin
#generator = tri_wave
#generator = square_wave
generator = eval(options.generator)

def sigalrm(sig, frm):
    global FREQ
    FREQ = 0

def lin_seq(frm, to, cnt):
    step = (to-frm)/float(cnt)
    samps = [0]*cnt
    for i in xrange(cnt):
        p = i / float(cnt-1)
        samps[i] = int(lin_interp(frm, to, p))
    return samps

def samps(freq, phase, cnt):
    global RATE, AMP
    samps = [0]*cnt
    for i in xrange(cnt):
        samps[i] = int(AMP * max(-1, min(1, options.volume*generator((phase + 2 * math.pi * freq * i / RATE) % (2*math.pi)))))
    return samps, (phase + 2 * math.pi * freq * cnt / RATE) % (2*math.pi)

def to_data(samps):
    return struct.pack('i'*len(samps), *samps)

def gen_data(data, frames, time, status):
    global FREQ, PHASE, Z_SAMP, LAST_SAMP, LAST_SAMPLES
    if FREQ == 0:
        PHASE = 0
        if LAST_SAMP == 0:
            return (Z_SAMP*frames, pyaudio.paContinue)
        fdata = lin_seq(LAST_SAMP, 0, frames)
        LAST_SAMP = fdata[-1]
        return (to_data(fdata), pyaudio.paContinue)
    fdata, PHASE = samps(FREQ, PHASE, frames)
    if options.gui:
        LAST_SAMPLES.extend(fdata)
    LAST_SAMP = fdata[-1]
    return (to_data(fdata), pyaudio.paContinue)

pa = pyaudio.PyAudio()
stream = pa.open(rate=RATE, channels=1, format=pyaudio.paInt32, output=True, frames_per_buffer=FPB, stream_callback=gen_data)

if options.gui:
    guithread = threading.Thread(target=GUIs[options.gui])
    guithread.setDaemon(True)
    guithread.start()

if options.test:
    FREQ = 440
    time.sleep(1)
    FREQ = 0
    time.sleep(1)
    FREQ = 880
    time.sleep(1)
    FREQ = 440
    time.sleep(2)
    exit()

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind(('', PORT))

signal.signal(signal.SIGALRM, sigalrm)

while True:
    data = ''
    while not data:
        try:
            data, cli = sock.recvfrom(4096)
        except socket.error:
            pass
    pkt = Packet.FromStr(data)
    print 'From', cli, 'command', pkt.cmd
    if pkt.cmd == CMD.KA:
        pass
    elif pkt.cmd == CMD.PING:
        sock.sendto(data, cli)
    elif pkt.cmd == CMD.QUIT:
        break
    elif pkt.cmd == CMD.PLAY:
        dur = pkt.data[0]+pkt.data[1]/1000000.0
        FREQ = pkt.data[2]
        AMP = MAX * (pkt.data[3]/255.0)
        signal.setitimer(signal.ITIMER_REAL, dur)
    elif pkt.cmd == CMD.CAPS:
        data = [0] * 8
        data[0] = STREAMS
        data[1] = stoi(IDENT)
        for i in xrange(len(UID)/4):
            data[i+2] = stoi(UID[4*i:4*(i+1)])
        sock.sendto(str(Packet(CMD.CAPS, *data)), cli)
    else:
        print 'Unknown cmd', pkt.cmd