# $Id$

# Quality test of media calls.
# - UA1 calls UA2
# - UA1 plays a file until finished to be streamed to UA2
# - UA2 records from stream
# - Apply PESQ to played file (reference) and recorded file (degraded)
#
# File should be:
# - naming: xxxxxx.CLOCK_RATE.wav, e.g: test1.8.wav
# - clock-rate of those files can only be 8khz or 16khz

import time
import imp
import os
import sys
import re
import subprocess
import wave
import shutil
import inc_const as const

from inc_cfg import *

# Load configuration
cfg_file = imp.load_source("cfg_file", ARGS[1])

# PESQ configs
PESQ = "tools/pesq"				# PESQ executable path
PESQ_DEFAULT_THRESHOLD = 3.4	# Default minimum acceptable PESQ MOS value

# PESQ params
pesq_sample_rate_opt = ""		# Sample rate option for PESQ
input_filename    = ""			# Input/Reference filename
output_filename = ""			# Output/Degraded filename


# Test body function
def test_func(t):
    global pesq_sample_rate_opt
    global input_filename
    global output_filename

    ua1 = t.process[0]
    ua2 = t.process[1]

    # Get input file name
    input_filename = re.compile(const.MEDIA_PLAY_FILE).search(ua1.inst_param.arg).group(1)

    # Get output file name
    output_filename = re.compile(const.MEDIA_REC_FILE).search(ua2.inst_param.arg).group(1)

    # Get WAV input length, in seconds
    fin = wave.open(input_filename, "r")
    if fin == None:
        raise TestError("Failed opening input WAV file")
    inwavlen = fin.getnframes() * 1.0 / fin.getframerate()
    inwavlen += 0.2
    fin.close()
    print "WAV input len = " + str(inwavlen) + "s"

    # Get clock rate of the output
    mo_clock_rate = re.compile("\.(\d+)\.wav").search(output_filename)
    if (mo_clock_rate==None):
        raise TestError("Cannot compare input & output, incorrect output filename format")
    clock_rate = mo_clock_rate.group(1)
    
    # Get channel count of the output
    channel_count = 1
    if re.search("--stereo", ua2.inst_param.arg) != None:
        channel_count = 2
    
    # Get matched input file from output file
    # (PESQ evaluates only files whose same clock rate & channel count)
    if channel_count == 2:
        if re.search("\.\d+\.\d+\.wav", input_filename) != None:
            input_filename = re.sub("\.\d+\.\d+\.wav", "." + str(channel_count) + "."+clock_rate+".wav", input_filename)
        else:
            input_filename = re.sub("\.\d+\.wav", "." + str(channel_count) + "."+clock_rate+".wav", input_filename)

    if (clock_rate != "8") & (clock_rate != "16"):
        raise TestError("PESQ only works on clock rate 8kHz or 16kHz, clock rate used = "+clock_rate+ "kHz")

    # Get conference clock rate of UA2 for PESQ sample rate option
    pesq_sample_rate_opt = "+" + clock_rate + "000"

    # UA1 making call
    if ua1.use_telnet:
        ua1.send("call new " + t.inst_params[1].uri)
    else:
        ua1.send("m")
        ua1.send(t.inst_params[1].uri)
    ua1.expect(const.STATE_CALLING)

    # UA2 wait until call established
    ua2.expect(const.STATE_CONFIRMED)

    ua1.sync_stdout()
    ua2.sync_stdout()
    time.sleep(2)

    # Disconnect mic -> rec file, to avoid echo recorded when using sound device
    # Disconnect stream -> spk, make it silent
    # Connect stream -> rec file, start recording
    ua2.send("cd 0 1")
    ua2.send("cd 4 0")
    ua2.send("cc 4 1")

    # Disconnect mic -> stream, make stream purely sending from file
    # Disconnect stream -> spk, make it silent
    # Connect file -> stream, start sending
    ua1.send("cd 0 4")
    ua1.send("cd 4 0")
    ua1.send("cc 1 4")

    time.sleep(inwavlen)

    # Disconnect files from bridge
    ua2.send("cd 4 1")
    ua2.expect(const.MEDIA_DISCONN_PORT_SUCCESS)
    ua1.send("cd 1 4")
    ua1.expect(const.MEDIA_DISCONN_PORT_SUCCESS)


# Post body function
def post_func(t):
    global pesq_sample_rate_opt
    global input_filename
    global output_filename

    endpt = t.process[0]

    # Execute PESQ
    fullcmd = os.path.normpath(PESQ) + " " + pesq_sample_rate_opt + " " + input_filename + " " + output_filename
    endpt.trace("Popen " + fullcmd)
    pesq_proc = subprocess.Popen(fullcmd, shell=True, stdout=subprocess.PIPE, universal_newlines=True)
    pesq_out  = pesq_proc.communicate()

    # Parse ouput
    mo_pesq_out = re.compile("Prediction[^=]+=\s+([\-\d\.]+)\s*").search(pesq_out[0])
    if (mo_pesq_out == None):
        raise TestError("Failed to fetch PESQ result")

    # Get threshold
    if (cfg_file.pesq_threshold != None) | (cfg_file.pesq_threshold > -0.5 ):
        threshold = cfg_file.pesq_threshold
    else:
        threshold = PESQ_DEFAULT_THRESHOLD

    # Evaluate the PESQ MOS value
    pesq_res = mo_pesq_out.group(1)
    if (float(pesq_res) >= threshold):
        endpt.trace("Success, PESQ result = " + pesq_res + " (target=" + str(threshold) + ").")
    else:
        endpt.trace("Failed, PESQ result = " + pesq_res + " (target=" + str(threshold) + ").")
        # Save the wav file
        wavoutname = ARGS[1]
        wavoutname = re.sub("[\\\/]", "_", wavoutname)
        wavoutname = re.sub("\.py$", ".wav", wavoutname)
        wavoutname = "logs/" + wavoutname
        try:
            shutil.copyfile(output_filename, wavoutname)
            print "Output WAV is copied to " + wavoutname
        except:
            print "Couldn't copy output WAV, please check if 'logs' directory exists."

        raise TestError("WAV seems to be degraded badly, PESQ = "+ pesq_res + " (target=" + str(threshold) + ").")


# Here where it all comes together
test = cfg_file.test_param
test.test_func = test_func
test.post_func = post_func

