14.1 `audioop` -- Manipulate raw audio data

The audioop module contains some useful operations on sound fragments. It operates on sound fragments consisting of signed integer samples 8, 16 or 32 bits wide, stored in Python strings. This is the same format as used by the al and sunaudiodev modules. All scalar items are integers, unless specified otherwise.

This module provides support for u-LAW and Intel/DVI ADPCM encodings.

A few of the more complicated operations only take 16-bit samples, otherwise the sample size (in bytes) is always a parameter of the operation.

The module defines the following variables and functions:

exception error: This exception is raised on all errors, such as unknown number of bytes per sample, etc.

add(fragment1, fragment2, width): Return a fragment which is the addition of the two samples passed as parameters. width is the sample width in bytes, either 1, 2 or 4. Both fragments should have the same length.

adpcm2lin(adpcmfragment, width, state): Decode an Intel/DVI ADPCM coded fragment to a linear fragment. See the description of lin2adpcm() for details on ADPCM coding. Return a tuple (sample, newstate) where the sample has the width specified in width.

adpcm32lin(adpcmfragment, width, state): Decode an alternative 3-bit ADPCM code. See lin2adpcm3() for details.

avg(fragment, width): Return the average over all samples in the fragment.

avgpp(fragment, width): Return the average peak-peak value over all samples in the fragment. No filtering is done, so the usefulness of this routine is questionable.

bias(fragment, width, bias): Return a fragment that is the original fragment with a bias added to each sample.

cross(fragment, width): Return the number of zero crossings in the fragment passed as an argument.

findfactor(fragment, reference): Return a factor F such that rms(add(fragment, mul(reference, -F))) is minimal, i.e., return the factor with which you should multiply reference to make it match as well as possible to fragment. The fragments should both contain 2-byte samples.
The time taken by this routine is proportional to len(fragment).

findfit(fragment, reference): Try to match reference as well as possible to a portion of fragment (which should be the longer fragment). This is (conceptually) done by taking slices out of fragment, using findfactor() to compute the best match, and minimizing the result. The fragments should both contain 2-byte samples. Return a tuple (offset, factor) where offset is the (integer) offset into fragment where the optimal match started and factor is the (floating-point) factor as per findfactor().

findmax(fragment, length): Search fragment for a slice of length length samples (not bytes!) with maximum energy, i.e., return i for which rms(fragment[i*2:(i+length)*2]) is maximal. The fragments should both contain 2-byte samples.
The routine takes time proportional to len(fragment).

getsample(fragment, width, index): Return the value of sample index from the fragment.

lin2lin(fragment, width, newwidth): Convert samples between 1-, 2- and 4-byte formats.

lin2adpcm(fragment, width, state): Convert samples to 4 bit Intel/DVI ADPCM encoding. ADPCM coding is an adaptive coding scheme, whereby each 4 bit number is the difference between one sample and the next, divided by a (varying) step. The Intel/DVI ADPCM algorithm has been selected for use by the IMA, so it may well become a standard.
state is a tuple containing the state of the coder. The coder returns a tuple (adpcmfrag, newstate), and the newstate should be passed to the next call of lin2adpcm(). In the initial call, NoneCan be passed as the state. adpcmfrag is the ADPCM coded fragment packed 2 4-bit values per byte.

lin2adpcm3(fragment, width, state): This is an alternative ADPCM coder that uses only 3 bits per sample. It is not compatible with the Intel/DVI ADPCM coder and its output is not packed (due to laziness on the side of the author). Its use is discouraged.

lin2ulaw(fragment, width): Convert samples in the audio fragment to u-LAW encoding and return this as a Python string. u-LAW is an audio encoding format whereby you get a dynamic range of about 14 bits using only 8 bit samples. It is used by the Sun audio hardware, among others.

minmax(fragment, width): Return a tuple consisting of the minimum and maximum values of all samples in the sound fragment.

max(fragment, width): Return the maximum of the absolute value of all samples in a fragment.

maxpp(fragment, width): Return the maximum peak-peak value in the sound fragment.

mul(fragment, width, factor): Return a fragment that has all samples in the original fragment multiplied by the floating-point value factor. Overflow is silently ignored.

ratecv(fragment, width, nchannels, inrate, outrate, state[, weightA[, weightB]])

Convert the frame rate of the input fragment.

state is a tuple containing the state of the converter. The converter returns a tuple (newfragment, newstate), and newstate should be passed to the next call of ratecv().

The weightA and weightB arguments are parameters for a simple digital filter and default to 1 and 0 respectively.

reverse(fragment, width): Reverse the samples in a fragment and returns the modified fragment.

rms(fragment, width): Return the root-mean-square of the fragment, i.e.

$\begin{displaymath} \catcode\lq _=8 \sqrt{\frac{\sum{{S_{i}}^{2}}}{n}} \end{displaymath}$

This is a measure of the power in an audio signal.

tomono(fragment, width, lfactor, rfactor): Convert a stereo fragment to a mono fragment. The left channel is multiplied by lfactor and the right channel by rfactor before adding the two channels to give a mono signal.

tostereo(fragment, width, lfactor, rfactor): Generate a stereo fragment from a mono fragment. Each pair of samples in the stereo fragment are computed from the mono sample, whereby left channel samples are multiplied by lfactor and right channel samples by rfactor.

ulaw2lin(fragment, width): Convert sound fragments in u-LAW encoding to linearly encoded sound fragments. u-LAW encoding always uses 8 bits samples, so width refers only to the sample width of the output fragment here.

Note that operations such as mul() or max() make no distinction between mono and stereo fragments, i.e. all samples are treated equal. If this is a problem the stereo fragment should be split into two mono fragments first and recombined later. Here is an example of how to do that:

def mul_stereo(sample, width, lfactor, rfactor):
 lsample = audioop.tomono(sample, width, 1, 0)
 rsample = audioop.tomono(sample, width, 0, 1)
 lsample = audioop.mul(sample, width, lfactor)
 rsample = audioop.mul(sample, width, rfactor)
 lsample = audioop.tostereo(lsample, width, 1, 0)
 rsample = audioop.tostereo(rsample, width, 0, 1)
 return audioop.add(lsample, rsample, width)

If you use the ADPCM coder to build network packets and you want your protocol to be stateless (i.e. to be able to tolerate packet loss) you should not only transmit the data but also the state. Note that you should send the initial state (the one you passed to lin2adpcm()) along to the decoder, not the final state (as returned by the coder). If you want to use struct.struct() to store the state in binary you can code the first element (the predicted value) in 16 bits and the second (the delta index) in 8.

The ADPCM coders have never been tried against other ADPCM coders, only against themselves. It could well be that I misinterpreted the standards in which case they will not be interoperable with the respective standards.

The find*() routines might look a bit funny at first sight. They are primarily meant to do echo cancellation. A reasonably fast way to do this is to pick the most energetic piece of the output sample, locate that in the input sample and subtract the whole output sample from the input sample:

def echocancel(outputdata, inputdata):
 pos = audioop.findmax(outputdata, 800) # one tenth second
 out_test = outputdata[pos*2:]
 in_test = inputdata[pos*2:]
 ipos, factor = audioop.findfit(in_test, out_test)
 # Optional (for better cancellation):
 # factor = audioop.findfactor(in_test[ipos*2:ipos*2+len(out_test)], 
 # out_test)
 prefill = '\0'*(pos+ipos)*2
 postfill = '\0'*(len(inputdata)-len(prefill)-len(outputdata))
 outputdata = prefill + audioop.mul(outputdata,2,-factor) + postfill
 return audioop.add(inputdata, outputdata, 2)

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