1 files changed, 150 insertions, 0 deletions
diff --git a/portaudio/test/patest_suggested_vs_streaminfo_latency.py b/portaudio/test/patest_suggested_vs_streaminfo_latency.py
new file mode 100644
index 0000000..8026787
--- /dev/null
+++ b/portaudio/test/patest_suggested_vs_streaminfo_latency.py
@@ -0,0 +1,150 @@
+#!/usr/bin/env python
+"""
+
+Run and graph the results of patest_suggested_vs_streaminfo_latency.c
+
+Requires matplotlib for plotting: http://matplotlib.sourceforge.net/
+
+"""
+import os
+from pylab import *
+import numpy
+from matplotlib.backends.backend_pdf import PdfPages
+
+testExeName = "PATest.exe" # rename to whatever the compiled patest_suggested_vs_streaminfo_latency.c binary is
+dataFileName = "patest_suggested_vs_streaminfo_latency.csv" # code below calls the exe to generate this file
+
+inputDeviceIndex = -1 # -1 means default
+outputDeviceIndex = -1 # -1 means default
+sampleRate = 44100
+pdfFilenameSuffix = "_wmme"
+
+pdfFile = PdfPages("patest_suggested_vs_streaminfo_latency_" + str(sampleRate) + pdfFilenameSuffix +".pdf") #output this pdf file
+
+
+def loadCsvData( dataFileName ):
+    params= ""
+    inputDevice = ""
+    outputDevice = ""
+
+    startLines = file(dataFileName).readlines(1024)
+    for line in startLines:
+        if "output device" in line:
+            outputDevice = line.strip(" \t\n\r#")
+        if "input device" in line:
+            inputDevice = line.strip(" \t\n\r#")
+    params = startLines[0].strip(" \t\n\r#")
+
+    data = numpy.loadtxt(dataFileName, delimiter=",", skiprows=4).transpose()
+
+    class R(object): pass
+    result = R()
+    result.params = params
+    for s in params.split(','):
+        if "sample rate" in s:
+            result.sampleRate = s
+
+    result.inputDevice = inputDevice
+    result.outputDevice = outputDevice
+    result.suggestedLatency = data[0]
+    result.halfDuplexOutputLatency = data[1]
+    result.halfDuplexInputLatency = data[2]
+    result.fullDuplexOutputLatency = data[3]
+    result.fullDuplexInputLatency = data[4]
+    return result;
+
+
+def setFigureTitleAndAxisLabels( framesPerBufferString ):
+    title("PortAudio suggested (requested) vs. resulting (reported) stream latency\n" + framesPerBufferString)
+    ylabel("PaStreamInfo::{input,output}Latency (s)")
+    xlabel("Pa_OpenStream suggestedLatency (s)")
+    grid(True)
+    legend(loc="upper left")
+
+def setDisplayRangeSeconds( maxSeconds ):
+    xlim(0, maxSeconds)
+    ylim(0, maxSeconds)
+
+
+# run the test with different frames per buffer values:
+
+compositeTestFramesPerBufferValues = [0]
+# powers of two
+for i in range (1,11):
+    compositeTestFramesPerBufferValues.append( pow(2,i) )
+
+# multiples of 50
+for i in range (1,20):
+    compositeTestFramesPerBufferValues.append( i * 50 )
+
+# 10ms buffer sizes
+compositeTestFramesPerBufferValues.append( 441 )
+compositeTestFramesPerBufferValues.append( 882 )
+
+# large primes
+#compositeTestFramesPerBufferValues.append( 39209 )
+#compositeTestFramesPerBufferValues.append( 37537 )
+#compositeTestFramesPerBufferValues.append( 26437 )
+
+individualPlotFramesPerBufferValues = [0,64,128,256,512] #output separate plots for these
+
+isFirst = True
+
+for framesPerBuffer in compositeTestFramesPerBufferValues:
+    commandString = testExeName + " " + str(inputDeviceIndex) + " " + str(outputDeviceIndex) + " " + str(sampleRate) + " " + str(framesPerBuffer) + ' > ' + dataFileName
+    print commandString
+    os.system(commandString)
+
+    d = loadCsvData(dataFileName)
+
+    if isFirst:
+        figure(1) # title sheet
+        gcf().text(0.1, 0.0,
+           "patest_suggested_vs_streaminfo_latency\n%s\n%s\n%s\n"%(d.inputDevice,d.outputDevice,d.sampleRate))
+        pdfFile.savefig()
+
+
+    figure(2) # composite plot, includes all compositeTestFramesPerBufferValues
+
+    if isFirst:
+        plot( d.suggestedLatency, d.suggestedLatency, label="Suggested latency" )
+
+    plot( d.suggestedLatency, d.halfDuplexOutputLatency )
+    plot( d.suggestedLatency, d.halfDuplexInputLatency )
+    plot( d.suggestedLatency, d.fullDuplexOutputLatency )
+    plot( d.suggestedLatency, d.fullDuplexInputLatency )
+
+    if framesPerBuffer in individualPlotFramesPerBufferValues: # individual plots
+        figure( 3 + individualPlotFramesPerBufferValues.index(framesPerBuffer) )
+
+        plot( d.suggestedLatency, d.suggestedLatency, label="Suggested latency" )
+        plot( d.suggestedLatency, d.halfDuplexOutputLatency, label="Half-duplex output latency" )
+        plot( d.suggestedLatency, d.halfDuplexInputLatency, label="Half-duplex input latency" )
+        plot( d.suggestedLatency, d.fullDuplexOutputLatency, label="Full-duplex output latency" )
+        plot( d.suggestedLatency, d.fullDuplexInputLatency, label="Full-duplex input latency" )
+
+        if framesPerBuffer == 0:
+            framesPerBufferText = "paFramesPerBufferUnspecified"
+        else:
+            framesPerBufferText = str(framesPerBuffer)
+        setFigureTitleAndAxisLabels( "user frames per buffer: "+str(framesPerBufferText) )
+        setDisplayRangeSeconds(2.2)
+        pdfFile.savefig()
+        setDisplayRangeSeconds(0.1)
+        setFigureTitleAndAxisLabels( "user frames per buffer: "+str(framesPerBufferText)+" (detail)" )
+        pdfFile.savefig()
+
+    isFirst = False
+
+figure(2)
+setFigureTitleAndAxisLabels( "composite of frames per buffer values:\n"+str(compositeTestFramesPerBufferValues) )
+setDisplayRangeSeconds(2.2)
+pdfFile.savefig()
+setDisplayRangeSeconds(0.1)
+setFigureTitleAndAxisLabels( "composite of frames per buffer values:\n"+str(compositeTestFramesPerBufferValues)+" (detail)" )
+pdfFile.savefig()
+
+pdfFile.close()
+
+#uncomment this to display interactively, otherwise we just output a pdf
+#show()