Chris@4: #!/usr/bin/env python
Chris@4: """
Chris@4: 
Chris@4: Run and graph the results of patest_suggested_vs_streaminfo_latency.c
Chris@4: 
Chris@4: Requires matplotlib for plotting: http://matplotlib.sourceforge.net/
Chris@4: 
Chris@4: """
Chris@4: import os
Chris@4: from pylab import *
Chris@4: import numpy
Chris@4: from matplotlib.backends.backend_pdf import PdfPages
Chris@4: 
Chris@4: testExeName = "PATest.exe" # rename to whatever the compiled patest_suggested_vs_streaminfo_latency.c binary is
Chris@4: dataFileName = "patest_suggested_vs_streaminfo_latency.csv" # code below calls the exe to generate this file
Chris@4: 
Chris@4: inputDeviceIndex = -1 # -1 means default
Chris@4: outputDeviceIndex = -1 # -1 means default
Chris@4: sampleRate = 44100
Chris@4: pdfFilenameSuffix = "_wmme"
Chris@4: 
Chris@4: pdfFile = PdfPages("patest_suggested_vs_streaminfo_latency_" + str(sampleRate) + pdfFilenameSuffix +".pdf") #output this pdf file
Chris@4: 
Chris@4: 
Chris@4: def loadCsvData( dataFileName ):
Chris@4:     params= ""
Chris@4:     inputDevice = ""
Chris@4:     outputDevice = ""
Chris@4: 
Chris@4:     startLines = file(dataFileName).readlines(1024)
Chris@4:     for line in startLines:
Chris@4:         if "output device" in line:
Chris@4:             outputDevice = line.strip(" \t\n\r#")
Chris@4:         if "input device" in line:
Chris@4:             inputDevice = line.strip(" \t\n\r#")
Chris@4:     params = startLines[0].strip(" \t\n\r#")
Chris@4: 
Chris@4:     data = numpy.loadtxt(dataFileName, delimiter=",", skiprows=4).transpose()
Chris@4: 
Chris@4:     class R(object): pass
Chris@4:     result = R()
Chris@4:     result.params = params
Chris@4:     for s in params.split(','):
Chris@4:         if "sample rate" in s:
Chris@4:             result.sampleRate = s
Chris@4: 
Chris@4:     result.inputDevice = inputDevice
Chris@4:     result.outputDevice = outputDevice
Chris@4:     result.suggestedLatency = data[0]
Chris@4:     result.halfDuplexOutputLatency = data[1]
Chris@4:     result.halfDuplexInputLatency = data[2]
Chris@4:     result.fullDuplexOutputLatency = data[3]
Chris@4:     result.fullDuplexInputLatency = data[4]
Chris@4:     return result;
Chris@4: 
Chris@4: 
Chris@4: def setFigureTitleAndAxisLabels( framesPerBufferString ):
Chris@4:     title("PortAudio suggested (requested) vs. resulting (reported) stream latency\n" + framesPerBufferString)
Chris@4:     ylabel("PaStreamInfo::{input,output}Latency (s)")
Chris@4:     xlabel("Pa_OpenStream suggestedLatency (s)")
Chris@4:     grid(True)
Chris@4:     legend(loc="upper left")
Chris@4: 
Chris@4: def setDisplayRangeSeconds( maxSeconds ):
Chris@4:     xlim(0, maxSeconds)
Chris@4:     ylim(0, maxSeconds)
Chris@4: 
Chris@4: 
Chris@4: # run the test with different frames per buffer values:
Chris@4: 
Chris@4: compositeTestFramesPerBufferValues = [0]
Chris@4: # powers of two
Chris@4: for i in range (1,11):
Chris@4:     compositeTestFramesPerBufferValues.append( pow(2,i) )
Chris@4: 
Chris@4: # multiples of 50
Chris@4: for i in range (1,20):
Chris@4:     compositeTestFramesPerBufferValues.append( i * 50 )
Chris@4: 
Chris@4: # 10ms buffer sizes
Chris@4: compositeTestFramesPerBufferValues.append( 441 )
Chris@4: compositeTestFramesPerBufferValues.append( 882 )
Chris@4: 
Chris@4: # large primes
Chris@4: #compositeTestFramesPerBufferValues.append( 39209 )
Chris@4: #compositeTestFramesPerBufferValues.append( 37537 )
Chris@4: #compositeTestFramesPerBufferValues.append( 26437 )
Chris@4: 
Chris@4: individualPlotFramesPerBufferValues = [0,64,128,256,512] #output separate plots for these
Chris@4: 
Chris@4: isFirst = True    
Chris@4: 
Chris@4: for framesPerBuffer in compositeTestFramesPerBufferValues:
Chris@4:     commandString = testExeName + " " + str(inputDeviceIndex) + " " + str(outputDeviceIndex) + " " + str(sampleRate) + " " + str(framesPerBuffer) + ' > ' + dataFileName
Chris@4:     print commandString
Chris@4:     os.system(commandString)
Chris@4: 
Chris@4:     d = loadCsvData(dataFileName)
Chris@4: 
Chris@4:     if isFirst:
Chris@4:         figure(1) # title sheet
Chris@4:         gcf().text(0.1, 0.0,
Chris@4:            "patest_suggested_vs_streaminfo_latency\n%s\n%s\n%s\n"%(d.inputDevice,d.outputDevice,d.sampleRate))
Chris@4:         pdfFile.savefig()
Chris@4:         
Chris@4:         
Chris@4:     figure(2) # composite plot, includes all compositeTestFramesPerBufferValues
Chris@4: 
Chris@4:     if isFirst:
Chris@4:         plot( d.suggestedLatency, d.suggestedLatency, label="Suggested latency" )
Chris@4:     
Chris@4:     plot( d.suggestedLatency, d.halfDuplexOutputLatency )
Chris@4:     plot( d.suggestedLatency, d.halfDuplexInputLatency )
Chris@4:     plot( d.suggestedLatency, d.fullDuplexOutputLatency )
Chris@4:     plot( d.suggestedLatency, d.fullDuplexInputLatency )
Chris@4: 
Chris@4:     if framesPerBuffer in individualPlotFramesPerBufferValues: # individual plots
Chris@4:         figure( 3 + individualPlotFramesPerBufferValues.index(framesPerBuffer) )
Chris@4: 
Chris@4:         plot( d.suggestedLatency, d.suggestedLatency, label="Suggested latency" )
Chris@4:         plot( d.suggestedLatency, d.halfDuplexOutputLatency, label="Half-duplex output latency" )
Chris@4:         plot( d.suggestedLatency, d.halfDuplexInputLatency, label="Half-duplex input latency" )
Chris@4:         plot( d.suggestedLatency, d.fullDuplexOutputLatency, label="Full-duplex output latency" )
Chris@4:         plot( d.suggestedLatency, d.fullDuplexInputLatency, label="Full-duplex input latency" )
Chris@4: 
Chris@4:         if framesPerBuffer == 0:
Chris@4:             framesPerBufferText = "paFramesPerBufferUnspecified"
Chris@4:         else:
Chris@4:             framesPerBufferText = str(framesPerBuffer)
Chris@4:         setFigureTitleAndAxisLabels( "user frames per buffer: "+str(framesPerBufferText) )
Chris@4:         setDisplayRangeSeconds(2.2)
Chris@4:         pdfFile.savefig()
Chris@4:         setDisplayRangeSeconds(0.1)
Chris@4:         setFigureTitleAndAxisLabels( "user frames per buffer: "+str(framesPerBufferText)+" (detail)" )
Chris@4:         pdfFile.savefig()
Chris@4: 
Chris@4:     isFirst = False
Chris@4: 
Chris@4: figure(2)
Chris@4: setFigureTitleAndAxisLabels( "composite of frames per buffer values:\n"+str(compositeTestFramesPerBufferValues) )
Chris@4: setDisplayRangeSeconds(2.2)
Chris@4: pdfFile.savefig()
Chris@4: setDisplayRangeSeconds(0.1)
Chris@4: setFigureTitleAndAxisLabels( "composite of frames per buffer values:\n"+str(compositeTestFramesPerBufferValues)+" (detail)" )
Chris@4: pdfFile.savefig()
Chris@4: 
Chris@4: pdfFile.close()
Chris@4: 
Chris@4: #uncomment this to display interactively, otherwise we just output a pdf
Chris@4: #show()