From b0b6de5e6c61fe92452bf057d2f0677a3d1fec9b Mon Sep 17 00:00:00 2001 From: Walter Bender Date: Fri, 20 Feb 2009 16:12:44 +0000 Subject: silbe patch to build alsaaudio on first launch --- (limited to 'arch_src/pyalsaaudio-0.2/doc/.svn') diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/README.txt b/arch_src/pyalsaaudio-0.2/doc/.svn/README.txt new file mode 100644 index 0000000..271a8ce --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/README.txt @@ -0,0 +1,2 @@ +This is a Subversion working copy administrative directory. +Visit http://subversion.tigris.org/ for more information. diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/dir-wcprops b/arch_src/pyalsaaudio-0.2/doc/.svn/dir-wcprops new file mode 100644 index 0000000..4238dab --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/dir-wcprops @@ -0,0 +1,5 @@ +K 25 +svn:wc:ra_dav:version-url +V 53 +/svn/Shtoom/!svn/ver/1274/trunk/audio/pyalsaaudio/doc +END diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/empty-file 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+END diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/prop-base/contents.gif.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/prop-base/contents.gif.svn-base new file mode 100644 index 0000000..5e9587e --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/prop-base/contents.gif.svn-base @@ -0,0 +1,5 @@ +K 13 +svn:mime-type +V 24 +application/octet-stream +END diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/prop-base/index.gif.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/prop-base/index.gif.svn-base new file mode 100644 index 0000000..5e9587e --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/prop-base/index.gif.svn-base @@ -0,0 +1,5 @@ +K 13 +svn:mime-type +V 24 +application/octet-stream +END diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/prop-base/modules.gif.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/prop-base/modules.gif.svn-base new file mode 100644 index 0000000..5e9587e --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/prop-base/modules.gif.svn-base @@ -0,0 +1,5 @@ +K 13 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b/arch_src/pyalsaaudio-0.2/doc/.svn/props/up.gif.svn-work @@ -0,0 +1,5 @@ +K 13 +svn:mime-type +V 24 +application/octet-stream +END diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/about.html.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/about.html.svn-base new file mode 100644 index 0000000..c47ebca --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/about.html.svn-base @@ -0,0 +1,110 @@ + + + + + + + + + + + +About this document ... + + + + + +

+About this document ... +

+ PyAlsaAudio +

This document was generated using the + LaTeX2HTML translator. +

+ +

+ LaTeX2HTML is Copyright © + 1993, 1994, 1995, 1996, 1997, Nikos + Drakos, Computer Based Learning Unit, University of + Leeds, and Copyright © 1997, 1998, Ross + Moore, Mathematics Department, Macquarie University, + Sydney. +

+ +

The application of + LaTeX2HTML to the Python + documentation has been heavily tailored by Fred L. Drake, + Jr. Original navigation icons were contributed by Christopher + Petrilli. +

+ + + + + + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/blank.gif.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/blank.gif.svn-base new file mode 100644 index 0000000..2e31f4e --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/blank.gif.svn-base Binary files differ diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/contents.gif.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/contents.gif.svn-base new file mode 100644 index 0000000..6d299c4 --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/contents.gif.svn-base Binary files differ diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/contents.html.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/contents.html.svn-base new file mode 100644 index 0000000..7f5eb2a --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/contents.html.svn-base @@ -0,0 +1,106 @@ + + + + + + + + + + + + + +Contents + + + + +

+Contents +

+ + +

- 1 What is ALSA +
- 2 ALSA and Python +
- 3 Installation +
- 4 alsaaudio +

+ +

+ + + + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/front.html.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/front.html.svn-base new file mode 100644 index 0000000..bbcdbc5 --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/front.html.svn-base @@ -0,0 +1,119 @@ + + + + + + + + + + + + + +Front Matter + + + + + +

+
+Front Matter +

+ +

+This software is licensed under the PSF license - the same one used +by the majority of the python distribution. Basically you can use it +for anything you wish (even commercial purposes). There is no warranty +whatsoever. + +

+ +

Abstract:

+ +This package contains wrappers for accessing the ALSA api from Python. It +is currently fairly complete for PCM devices and Mixer access. MIDI sequencer +support is low on my priority list, but volunteers are welcome. + +

+If you find bugs in the wrappers please notify me on email. Please +don't send bug reports regarding ALSA specifically. There are several +bugs in this api, and those should be reported to the ALSA team - not +me. +

+ +

PyAlsaAudio

Casper Wilstrup

cwi@unispeed.com

+ +

+ + + + + + + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/internals.pl.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/internals.pl.svn-base new file mode 100644 index 0000000..4864f4b --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/internals.pl.svn-base @@ -0,0 +1,34 @@ +# LaTeX2HTML 2002-2 (1.70) +# Associate internals original text with physical files. + + +$key = q/module-alsaaudio/; +$ref_files{$key} = "$dir".q|node6.html|; +$noresave{$key} = "$nosave"; + +$key = q/pcm-objects/; +$ref_files{$key} = "$dir".q|node8.html|; +$noresave{$key} = "$nosave"; + +$key = q/front/; +$ref_files{$key} = "$dir".q|node1.html|; +$noresave{$key} = "$nosave"; + +$key = q/contents/; +$ref_files{$key} = "$dir".q|node2.html|; +$noresave{$key} = "$nosave"; + +$key = q/mixer-objects/; +$ref_files{$key} = "$dir".q|node9.html|; +$noresave{$key} = "$nosave"; + +$key = q/pcm-example/; +$ref_files{$key} = "$dir".q|node10.html|; +$noresave{$key} = "$nosave"; + +$key = q/about/; +$ref_files{$key} = "$dir".q|node11.html|; +$noresave{$key} = "$nosave"; + +1; + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/intlabels.pl.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/intlabels.pl.svn-base new file mode 100644 index 0000000..972ec5a --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/intlabels.pl.svn-base @@ -0,0 +1,30 @@ +%internal_labels = (); +1; # hack in case there are no entries + +$internal_labels{"l2h-1"} = "/node6.html"; +$internal_labels{"l2h-2"} = "/node6.html"; +$internal_labels{"l2h-3"} = "/node6.html"; +$internal_labels{"l2h-4"} = "/node6.html"; +$internal_labels{"l2h-5"} = "/node6.html"; +$internal_labels{"l2h-6"} = "/node8.html"; +$internal_labels{"l2h-7"} = "/node8.html"; +$internal_labels{"l2h-8"} = "/node8.html"; +$internal_labels{"l2h-9"} = "/node8.html"; +$internal_labels{"l2h-10"} = "/node8.html"; +$internal_labels{"l2h-11"} = "/node8.html"; +$internal_labels{"l2h-12"} = "/node8.html"; +$internal_labels{"l2h-13"} = "/node8.html"; +$internal_labels{"l2h-14"} = "/node8.html"; +$internal_labels{"l2h-15"} = "/node8.html"; +$internal_labels{"l2h-16"} = "/node9.html"; +$internal_labels{"l2h-17"} = "/node9.html"; +$internal_labels{"l2h-18"} = "/node9.html"; +$internal_labels{"l2h-19"} = "/node9.html"; +$internal_labels{"l2h-20"} = "/node9.html"; +$internal_labels{"l2h-21"} = "/node9.html"; +$internal_labels{"l2h-22"} = "/node9.html"; +$internal_labels{"l2h-23"} = "/node9.html"; +$internal_labels{"l2h-24"} = "/node9.html"; +$internal_labels{"l2h-25"} = "/node9.html"; +$internal_labels{"l2h-26"} = "/node9.html"; +$internal_labels{"l2h-27"} = "/node9.html"; diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/labels.pl.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/labels.pl.svn-base new file mode 100644 index 0000000..f3d0859 --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/labels.pl.svn-base @@ -0,0 +1,57 @@ +# LaTeX2HTML 2002-2-1 (1.70) +# Associate labels original text with physical files. + + +$key = q/module-alsaaudio/; +$external_labels{$key} = "$URL/" . q|node6.html|; +$noresave{$key} = "$nosave"; + +$key = q/pcm-objects/; +$external_labels{$key} = "$URL/" . q|node8.html|; +$noresave{$key} = "$nosave"; + +$key = q/front/; +$external_labels{$key} = "$URL/" . q|node1.html|; +$noresave{$key} = "$nosave"; + +$key = q/contents/; +$external_labels{$key} = "$URL/" . q|node2.html|; +$noresave{$key} = "$nosave"; + +$key = q/mixer-objects/; +$external_labels{$key} = "$URL/" . q|node9.html|; +$noresave{$key} = "$nosave"; + +$key = q/pcm-example/; +$external_labels{$key} = "$URL/" . q|node10.html|; +$noresave{$key} = "$nosave"; + +$key = q/about/; +$external_labels{$key} = "$URL/" . q|node11.html|; +$noresave{$key} = "$nosave"; + +1; + + +# LaTeX2HTML 2002-2-1 (1.70) +# labels from external_latex_labels array. + + +$key = q/module-alsaaudio/; +$external_latex_labels{$key} = q|4|; +$noresave{$key} = "$nosave"; + +$key = q/pcm-objects/; +$external_latex_labels{$key} = q|4.2|; +$noresave{$key} = "$nosave"; + +$key = q/mixer-objects/; +$external_latex_labels{$key} = q|4.3|; +$noresave{$key} = "$nosave"; + +$key = q/pcm-example/; +$external_latex_labels{$key} = q|4.4|; +$noresave{$key} = "$nosave"; + +1; + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/mixer-objects.html.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/mixer-objects.html.svn-base new file mode 100644 index 0000000..5a4d516 --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/mixer-objects.html.svn-base @@ -0,0 +1,327 @@ + + + + + + + + + + + + + +4.3 Mixer Objects + + + + + +

+ +
+4.3 Mixer Objects +

+ +

+Mixer objects provides access to the ALSA mixer API. + +

+ +
class Mixer( [control], [id], [cardname])

+control - specifies which control to manipulate using this mixer object. The list +of available controls can be found with the alsaaudio.mixers function. +The default value is 'Master' - other common controls include 'Master Mono', 'PCM', 'Line', etc. + +

+id - the id of the mixer control. Default is 0 + +

+cardname - specifies which card should be used (this is only relevant +if you have more than one sound card). Omit to use the default sound card +

+ +

+Mixer objects have the following methods: + +

+ +
cardname( ): +Return the name of the sound card used by this Mixer object +

+ +

+ +
mixer( ): +Return the name of the specific mixer controlled by this object, For example 'Master' +or 'PCM' +

+ +

+ +
mixerid( ): +Return the ID of the ALSA mixer controlled by this object. +

+ +

+ +
switchcap( )

+Returns a list of the switches which are defined by this specific mixer. Possible values in +this list are: + +

+ + + + + + + + + + + + + + + + + + + + + +

Switch	Description
'Mute'	This mixer can be muted
'Joined Mute'	This mixer can mute all channels at the same time
'Playback Mute'	This mixer can mute the playback output
'Joined Playback Mute'	Mute playback for all channels at the same time
'Capture Mute'	Mute sound capture
'Joined Capture Mute'	Mute sound capture for all channels at a time
'Capture Exclusive'	Not quite sure what this is

+ +

+To manipulate these swithes use the setrec or setmute methods +

+ +

+ +
volumecap( )

+Returns a list of the volume control capabilities of this mixer. Possible values in +the list are: + +

+ + + + + + + + + + + + + + + + + + + +

Capability	Description
'Volume'	This mixer can control volume
'Joined Volume'	This mixer can control volume for all channels at the same time
'Playback Volume'	This mixer can manipulate the playback volume
'Joined Playback Volume'	Manipulate playback volumne for all channels at the same time
'Capture Volume'	Manipulate sound capture volume
'Joined Capture Volume'	Manipulate sound capture volume for all channels at a time

+ +

+ +
getvolume( [direction])

+Returns a list with the current volume settings for each channel. The list elements +are integer percentages. + +

+The optional direction argument can be either 'playback' or 'capture', which is relevant +if the mixer can control both playback and capture volume. The default value is 'playback' +if the mixer has this capability, otherwise 'capture' + +

+ +

+ +
getmute( ): +Return a list indicating the current mute setting for each channel. 0 means not muted, 1 means muted. + +
+This method will fail if the mixer has no playback switch capabilities. +

+ +

+ +
getrec( ): +Return a list indicating the current record mute setting for each channel. 0 means not recording, 1 +means not recording. + +
+This method will fail if the mixer has no capture switch capabilities. +

+ +

+ +
setvolume( volume,[channel],[direction])

+Change the current volume settings for this mixer. The volume argument controls +the new volume setting as an integer percentage. + +

+If the optional argument channel is present, the volume is set only for this channel. This +assumes that the mixer can control the volume for the channels independently. + +

+The optional direction argument can be either 'playback' or 'capture' is relevant if the mixer +has independent playback and capture volume capabilities, and controls which of the volumes +if changed. The default is 'playback' if the mixer has this capability, otherwise 'capture'. +

+ +

+ +
setmute( mute, [channel])

+Sets the mute flag to a new value. The mute argument is either 0 for not muted, or 1 for muted. + +

+The optional channel argument controls which channel is muted. The default is to set the mute flag +for all channels. + +

+This method will fail if the mixer has no playback mute capabilities +

+ +

+ +
setrec( capture,[channel])

+Sets the capture mute flag to a new value. The capture argument is either 0 for no capture, +or 1 for capture. + +

+The optional channel argument controls which channel is changed. The default is to set the capture flag +for all channels. + +

+This method will fail if the mixer has no capture switch capabilities +

+ +

+A Note on the ALSA Mixer API + +

+The ALSA mixer API is extremely complicated - and hardly documented at all. alsaaudio implements +a much simplified way to access this API. In designing the API I've had to make some choices which +may limit what can and cannot be controlled through the API. However, If I had chosen to implement the +full API, I would have reexposed the horrible complexity/documentation ratio of the underlying API. +At least the alsaaudio API is easy to understand and use. + +

+If my design choises prevents you from doing something that the underlying API would have allowed, +please let me know, so I can incorporate these need into future versions. + +

+If the current state of affairs annoy you, the best you can do is to write a HOWTO on the API and +make this available on the net. Until somebody does this, the availability of ALSA mixer capable +devices will stay quite limited. + +

+Unfortunately, I'm not able to create such a HOWTO myself, since I only understand half of the API, +and that which I do understand has come from a painful trial and error process. + +

+ +

+ + + + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/module-alsaaudio.html.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/module-alsaaudio.html.svn-base new file mode 100644 index 0000000..c3673ee --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/module-alsaaudio.html.svn-base @@ -0,0 +1,167 @@ + + + + + + + + + + + + +4 alsaaudio + + + + + +

+4 `alsaaudio` +

+ +

Availability: Linux.

+ +

+The alsaaudio module defines functions and classes for using +ALSA. + +

+ +
mixers( [cardname]): +List the available mixers. The optional cardname specifies which +card should be queried (this is only relevant if you have more than one +sound card). Omit to use the default sound card +

+ +

+ +
class PCM( [type], [mode], [cardname]): +This class is used to represent a PCM device (both playback and capture devices). +The arguments are: +
type - can be either PCM_CAPTURE or PCM_PLAYBACK (default). +
mode - can be either PCM_NONBLOCK, PCM_ASYNC, or PCM_NORMAL (the default). +
cardname - specifies which card should be used (this is only relevant +if you have more than one sound card). Omit to use the default sound card +

+ +

+ +
class Mixer( [control], [id], [cardname]): +This class is used to access a specific ALSA mixer. +The arguments are: +
control - Name of the chosen mixed (default is Master). +
id - id of mixer (default is 0) - More explaniation needed here +
cardname specifies which card should be used (this is only relevant +if you have more than one sound card). Omit to use the default sound card +

+ +

exception ALSAAudioError: +Exception raised when an operation fails for a ALSA specific reason. +The exception argument is a string describing the reason of the +failure. +

+ +

+ + + + + + + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/modules.gif.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/modules.gif.svn-base new file mode 100644 index 0000000..f5860b6 --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/modules.gif.svn-base Binary files differ diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/next.gif.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/next.gif.svn-base new file mode 100644 index 0000000..5dcaff8 --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/next.gif.svn-base Binary files differ diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/node3.html.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/node3.html.svn-base new file mode 100644 index 0000000..e848a78 --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/node3.html.svn-base @@ -0,0 +1,120 @@ + + + + + + + + + + + + + +1 What is ALSA + + + + + +

+1 What is ALSA +

+ +

+The Advanced Linux Sound Architecture (ALSA) provides audio and MIDI +functionality to the Linux operating system. + +

+Logically ALSA consists of these components: + +

A set of kernel drivers. +
+These drivers are responsible for handling the physical sound + hardware from within the Linux kernel, and have been the standard + sound implementation in Linux since kernel version 2.5 +
A kernel level API for manipulating the ALSA devices. +
A user-space C library for simplified access to the sound hardware + from userspace applications. This library is called libasound + and is required by all ALSA capable applications. +

+ +

+More information about ALSA may be found on the project homepage +http://www.alsa-project.org +

+ +

+ + + + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/node4.html.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/node4.html.svn-base new file mode 100644 index 0000000..9c6ab01 --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/node4.html.svn-base @@ -0,0 +1,116 @@ + + + + + + + + + + + + + +2 ALSA and Python + + + + + +

+2 ALSA and Python +

+ +

+The older Linux sound API (OSS) which is now deprecated is well supported +from the standard Python library, through the ossaudiodev module. No native +ALSA support exists in the standard library (yet). + +

+There are a few other ``ALSA for Python'' projects available, including at +least two different projects called pyAlsa. Neither of these seem to be under +active development at the time - and neither are very feature complete. + +

+I wrote PyAlsaAudio to fill this gap. My long term goal is to have the module +included in the standard Python library, but that is probably a while of yet. + +

+PyAlsaAudio hass full support for sound capture, playback of sound, as well as +the ALSA Mixer API. + +

+MIDI support is not available, and since I don't own any MIDI hardware, it's +difficult for me to implement it. Volunteers to work on this would be greatly +appreciated + +

+ + + + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/node5.html.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/node5.html.svn-base new file mode 100644 index 0000000..923ac75 --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/node5.html.svn-base @@ -0,0 +1,115 @@ + + + + + + + + + + + + + +3 Installation + + + + + +

+3 Installation +

+ +

+Note: the wrappers link with the alsasound library (from the alsa-lib +package). Verify that this is installed by looking for /usr/lib/libasound.so +before building. Naturally you also need to use a kernel with proper ALSA +support. This is the default in Linux kernel 2.6 and later. If you are using +kernel version 2.4 you may need to install the ALSA patches yourself - although +most distributions ship with ALSA kernels. + +

+To install, execute the following: +

+$ python setup.py build
+

+ +

+And then as root: +

+# python setup.py install
+

+ +

+ + + + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/node7.html.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/node7.html.svn-base new file mode 100644 index 0000000..f58333a --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/node7.html.svn-base @@ -0,0 +1,169 @@ + + + + + + + + + + + + + +4.1 PCM Terminology and Concepts + + + + + +

+4.1 PCM Terminology and Concepts +

+ +

+In order to use PCM devices it is useful to be familiar with some concepts and +terminology. + +

Sample

PCM audio, whether it is input or output, consists at the lowest level +of a number of single samples. A sample represents the sound in a single channel in +a brief interval. If more than one channel is in use, more than one sample is required +for each interval to describe the sound. Samples can be of many different sizes, ranging +from 8 bit to 64 bit presition. The specific format of each sample can also vary - they +can be big endian byte order, little endian byte order, or even floats. + +

Frame

A frame consists of exactly one sample per channel. If there is only one +channel (Mono sound) a frame is simply a single sample. If the sound is stereo, each frame +consists of two samples, etc. + +

Frame size

This is the size in bytes of each frame. This can vary a lot: if each sample is +8 bits, and we're handling mono sound, the frame size is one byte. Similarly in 6 channel audio with +64 bit floating point samples, the frame size is 48 bytes + +

Rate

PCM sound consists of a flow of sound frames. The sound rate controls how often +the current frame is replaced. For example, a rate of 8000 Hz means that a new frame is played +or captured 8000 times per second. + +

Data rate

This is the number of bytes, which must be recorded or provided per second +at a certain frame size and rate. + +

+8000 Hz mono sound with 8 bit (1 byte) samples has a data rate of 8000 * 1 * 1 = 8 kb/s + +

+At the other end of the scale, 96000 Hz, 6 channel sound with 64 bit (8 bytes) samples +has a data rate of 96000 * 6 * 8 = 4608 kb/s (almost 5 Mb sound data per second) + +

Period

When the hardware processes data this is done in chunks of frames. The time interval +between each processing (A/D or D/A conversion) is known as the period. The size of the period has +direct implication on the latency of the sound input or output. For low-latency the period size should +be very small, while low CPU resource usage would usually demand larger period sizes. With ALSA, the +CPU utilization is not impacted much by the period size, since the kernel layer buffers multiple +periods internally, so each period generates an interrupt and a memory copy, but userspace can be +slower and read or write multiple periods at the same time. + +

Period size

This is the size of each period in Hz. Not bytes, but Hz!. In alsaaudio +the period size is set directly, and it is therefore important to understand the significance of this +number. If the period size is configured to for example 32, each write should contain exactly 32 frames +of sound data, and each read will return either 32 frames of data or nothing at all. + +

+ +

+Once you understand these concepts, you will be ready to actually utilize PCM API. Read on. + +

+ +

+ + + + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pcm-example.html.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pcm-example.html.svn-base new file mode 100644 index 0000000..d458bac --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pcm-example.html.svn-base @@ -0,0 +1,99 @@ + + + + + + + + + + + + +4.4 ALSA Examples + + + + + +

+
+4.4 ALSA Examples +

+ +

+For now, the only examples available are the 'playbacktest.py' and the 'recordtest.py' programs included. +This will change in a future version. + +

+ +

+ + + + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pcm-objects.html.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pcm-objects.html.svn-base new file mode 100644 index 0000000..3fc5d78 --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pcm-objects.html.svn-base @@ -0,0 +1,331 @@ + + + + + + + + + + + + + +4.2 PCM Objects + + + + + +

+ +
+4.2 PCM Objects +

+ +

+The acronym PCM is short for Pulse Code Modulation and is the method used in ALSA +and many other places to handle playback and capture of sampled sound data. + +

+PCM objects in alsaaudio are used to do exactly that, either play sample based +sound or capture sound from some input source (perhaps a microphone). The PCM object +constructor takes the following arguments: + +

+ +
class PCM( [type], [mode], [cardname])

+ +

+type - can be either PCM_CAPTURE or PCM_PLAYBACK (default). + +

+mode - can be either PCM_NONBLOCK, PCM_ASYNC, or PCM_NORMAL (the default). +In PCM_NONBLOCK mode, calls to read will return immediately independent of wether +there is any actual data to read. Similarly, write calls will return immediately +without actually writing anything to the playout buffer if the buffer is full. + +

+In the current version of alsaaudio PCM_ASYNC is useless, since it relies +on a callback procedure, which can't be specified from Python. + +

+cardname - specifies which card should be used (this is only relevant +if you have more than one sound card). Omit to use the default sound card + +

+This will construct a PCM object with default settings: + +

+Sample format: PCM_FORMAT_S16_LE +
+Rate: 8000 Hz +
+Channels: 2 +
+Period size: 32 frames +

+ +

+PCM objects have the following methods: + +

+ +
pcmtype( ): +Returns the type of PCM object. Either PCM_CAPTURE or PCM_PLAYBACK. +

+ +

+ +
pcmmode( ): +Return the mode of the PCM object. One of PCM_NONBLOCK, PCM_ASYNC, or PCM_NORMAL +

+ +

+ +
cardname( ): +Return the name of the sound card used by this PCM object. +

+ +

+ +
setchannels( nchannels): +Used to set the number of capture or playback channels. Common values are: 1 = mono, 2 = stereo, +and 6 = full 6 channel audio. Few sound cards support more than 2 channels +

+ +

+ +
setrate( rate): +Set the sample rate in Hz for the device. Typical values are 8000 (poor sound), 16000, 44100 (cd quality), +and 96000 +

+ +

+ +
setformat( )

+The sound format of the device. Sound format controls how the PCM device interpret data for playback, +and how data is encoded in captures. + +

+The following formats are provided by ALSA: +

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +

Format	Description
PCM_FORMAT_S8	Signed 8 bit samples for each channel
PCM_FORMAT_U8	Signed 8 bit samples for each channel
PCM_FORMAT_S16_LE	Signed 16 bit samples for each channel (Little Endian byte order)
PCM_FORMAT_S16_BE	Signed 16 bit samples for each channel (Big Endian byte order)
PCM_FORMAT_U16_LE	Unsigned 16 bit samples for each channel (Little Endian byte order)
PCM_FORMAT_U16_BE	Unsigned 16 bit samples for each channel (Big Endian byte order)
PCM_FORMAT_S24_LE	Signed 24 bit samples for each channel (Little Endian byte order)
PCM_FORMAT_S24_BE	Signed 24 bit samples for each channel (Big Endian byte order)
PCM_FORMAT_U24_LE	Unsigned 24 bit samples for each channel (Little Endian byte order)
PCM_FORMAT_U24_BE	Unsigned 24 bit samples for each channel (Big Endian byte order)
PCM_FORMAT_S32_LE	Signed 32 bit samples for each channel (Little Endian byte order)
PCM_FORMAT_S32_BE	Signed 32 bit samples for each channel (Big Endian byte order)
PCM_FORMAT_U32_LE	Unsigned 32 bit samples for each channel (Little Endian byte order)
PCM_FORMAT_U32_BE	Unsigned 32 bit samples for each channel (Big Endian byte order)
PCM_FORMAT_FLOAT_LE	32 bit samples encoded as float. (Little Endian byte order)
PCM_FORMAT_FLOAT_BE	32 bit samples encoded as float (Big Endian byte order)
PCM_FORMAT_FLOAT64_LE	64 bit samples encoded as float. (Little Endian byte order)
PCM_FORMAT_FLOAT64_BE	64 bit samples encoded as float. (Big Endian byte order)
PCM_FORMAT_MU_LAW	A logarithmic encoding (used by Sun .au files)
PCM_FORMAT_A_LAW	Another logarithmic encoding
PCM_FORMAT_IMA_ADPCM	a 4:1 compressed format defined by the Interactive Multimedia Association
PCM_FORMAT_MPEG	MPEG encoded audio?
PCM_FORMAT_GSM	9600 constant rate encoding well suitet for speech

+ +

+ +
setperiodsize( period): +Sets the actual period size in frames. Each write should consist of exactly this number of frames, and +each read will return this number of frames (unless the device is in PCM_NONBLOCK mode, in which case +it may return nothing at all) +

+ +

+ +
read( ): +In PCM_NORMAL mode, this function blocks until a full period is available, and then returns a +tuple (length,data) where length is the size in bytes of the captured data, and data +is the captured sound frames as a string. The length of the returned data will be periodsize*framesize +bytes. + +
+In PCM_NONBLOCK mode, the call will not block, but will return (0,'') if no new period +has become available since the last call to read. +

+ +

+ +
write( data)

+Writes (plays) the sound in data. The length of data must be a multiple of the frame size, and +should be exactly the size of a period. If less than 'period size' frames are provided, the actual +playout will not happen until more data is written. + +

+If the device is not in PCM_NONBLOCK mode, this call will block if the kernel buffer is full, and +until enough sound has been played to allow the sound data to be buffered. The call always returns +the size of the data provided + +

+In PCM_NONBLOCK mode, the call will return immediately, with a return value of zero, if the buffer is +full. In this case, the data should be written at a later time. + +

+ +

+A few hints on using PCM devices for playback + +

+The most common reason for problems with playback of PCM audio, is that the people don't properly understand +that writes to PCM devices must match exactly the data rate of the device. + +

+If too little data is written to the device, it will underrun, and ugly clicking sounds will occur. Conversely, +of too much data is written to the device, the write function will either block (PCM_NORMAL mode) or return zero +(PCM_NONBLOCK mode). + +

+If your program does nothing, but play sound, the easiest way is to put the device in PCM_NORMAL mode, and just +write as much data to the device as possible. This strategy can also be achieved by using a separate thread +with the sole task of playing out sound. + +

+In GUI programs, however, it may be a better strategy to setup the device, preload the buffer with a few +periods by calling write a couple of times, and then use some timer method to write one period size of data to +the device every period. The purpose of the preloading is to avoid underrun clicks if the used timer +doesn't expire exactly on time. + +

+Also note, that most timer API's that you can find for Python will cummulate time delays: If you set the timer +to expire after 1/10'th of a second, the actual timeout will happen slightly later, which will accumulate to +quite a lot after a few seconds. Hint: use time.time() to check how much time has really passed, and add +extra writes as nessecary. + +

+ +

+ + + + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/previous.gif.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/previous.gif.svn-base new file mode 100644 index 0000000..de1da16 --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/previous.gif.svn-base Binary files differ diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pyalsaaudio.css.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pyalsaaudio.css.svn-base new file mode 100644 index 0000000..06a613c --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pyalsaaudio.css.svn-base @@ -0,0 +1,243 @@ +/* + * The first part of this is the standard CSS generated by LaTeX2HTML, + * with the "empty" declarations removed. + */ + +/* Century Schoolbook font is very similar to Computer Modern Math: cmmi */ +.math { font-family: "Century Schoolbook", serif; } +.math i { font-family: "Century Schoolbook", serif; + font-weight: bold } +.boldmath { font-family: "Century Schoolbook", serif; + font-weight: bold } + +/* + * Implement both fixed-size and relative sizes. + * + * I think these can be safely removed, as it doesn't appear that + * LaTeX2HTML ever generates these, even though these are carried + * over from the LaTeX2HTML stylesheet. + */ +small.xtiny { font-size : xx-small; } +small.tiny { font-size : x-small; } +small.scriptsize { font-size : smaller; } +small.footnotesize { font-size : small; } +big.xlarge { font-size : large; } +big.xxlarge { font-size : x-large; } +big.huge { font-size : larger; } +big.xhuge { font-size : xx-large; } + +/* + * Document-specific styles come next; + * these are added for the Python documentation. + * + * Note that the size specifications for the H* elements are because + * Netscape on Solaris otherwise doesn't get it right; they all end up + * the normal text size. + */ + +body { color: #000000; + background-color: #ffffff; } + +a:link:active { color: #ff0000; } +a:link:hover { background-color: #bbeeff; } +a:visited:hover { background-color: #bbeeff; } +a:visited { color: #551a8b; } +a:link { color: #0000bb; } + +h1, h2, h3, h4, h5, h6 { font-family: avantgarde, sans-serif; + font-weight: bold; } +h1 { font-size: 180%; } +h2 { font-size: 150%; } +h3, h4 { font-size: 120%; } + +/* These are section titles used in navigation links, so make sure we + * match the section header font here, even it not the weight. + */ +.sectref { font-family: avantgarde, sans-serif; } +/* And the label before the titles in navigation: */ +.navlabel { font-size: 85%; } + + +/* LaTeX2HTML insists on inserting
elements into headers which + * are marked with \label. This little bit of CSS magic ensures that + * these elements don't cause spurious whitespace to be added. + */ +h1>br, h2>br, h3>br, +h4>br, h5>br, h6>br { display: none; } + +code, tt { font-family: "lucida typewriter", lucidatypewriter, + monospace; } +var { font-family: times, serif; + font-style: italic; + font-weight: normal; } + +.Unix { font-variant: small-caps; } + +.typelabel { font-family: lucida, sans-serif; } + +.navigation td { background-color: #99ccff; + font-weight: bold; + font-family: avantgarde, sans-serif; + font-size: 110%; } + +div.warning { background-color: #fffaf0; + border: thin solid black; + padding: 1em; + margin-left: 2em; + margin-right: 2em; } + +div.warning .label { font-family: sans-serif; + font-size: 110%; + margin-right: 0.5em; } + +div.note { background-color: #fffaf0; + border: thin solid black; + padding: 1em; + margin-left: 2em; + margin-right: 2em; } + +div.note .label { margin-right: 0.5em; + font-family: sans-serif; } + +address { font-size: 80%; } +.release-info { font-style: italic; + font-size: 80%; } + +.titlegraphic { vertical-align: top; } + +.verbatim pre { color: #00008b; + font-family: "lucida typewriter", lucidatypewriter, + monospace; + font-size: 90%; } +.verbatim { margin-left: 2em; } +.verbatim .footer { padding: 0.05in; + font-size: 85%; + background-color: #99ccff; + margin-right: 0.5in; } + +.grammar { background-color: #99ccff; + margin-right: 0.5in; + padding: 0.05in; } +.grammar-footer { padding: 0.05in; + font-size: 85%; } +.grammartoken { font-family: "lucida typewriter", lucidatypewriter, + monospace; } + +.productions { background-color: #bbeeff; } +.productions a:active { color: #ff0000; } +.productions a:link:hover { background-color: #99ccff; } +.productions a:visited:hover { background-color: #99ccff; } +.productions a:visited { color: #551a8b; } +.productions a:link { color: #0000bb; } +.productions table { vertical-align: baseline; + empty-cells: show; } +.productions > table td, +.productions > table th { padding: 2px; } +.productions > table td:first-child, +.productions > table td:last-child { + font-family: "lucida typewriter", + lucidatypewriter, + monospace; + } +/* same as the second selector above, but expressed differently for Opera */ +.productions > table td:first-child + td + td { + font-family: "lucida typewriter", + lucidatypewriter, + monospace; + vertical-align: baseline; + } +.productions > table td:first-child + td { + padding-left: 1em; + padding-right: 1em; + } +.productions > table tr { vertical-align: baseline; } + +.email { font-family: avantgarde, sans-serif; } +.mailheader { font-family: avantgarde, sans-serif; } +.mimetype { font-family: avantgarde, sans-serif; } +.newsgroup { font-family: avantgarde, sans-serif; } +.url { font-family: avantgarde, sans-serif; } +.file { font-family: avantgarde, sans-serif; } +.guilabel { font-family: avantgarde, sans-serif; } + +.realtable { border-collapse: collapse; + border-color: black; + border-style: solid; + border-width: 0px 0px 2px 0px; + empty-cells: show; + margin-left: auto; + margin-right: auto; + padding-left: 0.4em; + padding-right: 0.4em; + } +.realtable tbody { vertical-align: baseline; } +.realtable tfoot { display: table-footer-group; } +.realtable thead { background-color: #99ccff; + border-width: 0px 0px 2px 1px; + display: table-header-group; + font-family: avantgarde, sans-serif; + font-weight: bold; + vertical-align: baseline; + } +.realtable thead :first-child { + border-width: 0px 0px 2px 0px; + } +.realtable thead th { border-width: 0px 0px 2px 1px } +.realtable td, +.realtable th { border-color: black; + border-style: solid; + border-width: 0px 0px 1px 1px; + padding-left: 0.4em; + padding-right: 0.4em; + } +.realtable td:first-child, +.realtable th:first-child { + border-left-width: 0px; + vertical-align: baseline; + } +.center { text-align: center; } +.left { text-align: left; } +.right { text-align: right; } + +.refcount-info { font-style: italic; } +.refcount-info .value { font-weight: bold; + color: #006600; } + +/* + * Some decoration for the "See also:" blocks, in part inspired by some of + * the styling on Lars Marius Garshol's XSA pages. + * (The blue in the navigation bars is #99CCFF.) + */ +.seealso { background-color: #fffaf0; + border: thin solid black; + padding: 0pt 1em 4pt 1em; } + +.seealso > .heading { font-size: 110%; + font-weight: bold; } + +/* + * Class 'availability' is used for module availability statements at + * the top of modules. + */ +.availability .platform { font-weight: bold; } + + +/* + * Additional styles for the distutils package. + */ +.du-command { font-family: monospace; } +.du-option { font-family: avantgarde, sans-serif; } +.du-filevar { font-family: avantgarde, sans-serif; + font-style: italic; } +.du-xxx:before { content: "** "; + font-weight: bold; } +.du-xxx:after { content: " **"; + font-weight: bold; } + + +/* + * Some specialization for printed output. + */ +@media print { + .online-navigation { display: none; } + } diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pyalsaaudio.html.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pyalsaaudio.html.svn-base new file mode 100644 index 0000000..fc3e86f --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pyalsaaudio.html.svn-base @@ -0,0 +1,110 @@ + + + + + + + + + + +PyAlsaAudio + + + + + +

PyAlsaAudio

Casper Wilstrup

cwi@unispeed.com

+ +

+ + + + + + + diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pyfav.gif.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pyfav.gif.svn-base new file mode 100644 index 0000000..58271ed --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/pyfav.gif.svn-base Binary files differ diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/up.gif.svn-base b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/up.gif.svn-base new file mode 100644 index 0000000..a9d3e13 --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/text-base/up.gif.svn-base Binary files differ diff --git a/arch_src/pyalsaaudio-0.2/doc/.svn/wcprops/about.html.svn-work b/arch_src/pyalsaaudio-0.2/doc/.svn/wcprops/about.html.svn-work new file mode 100644 index 0000000..d2c4115 --- /dev/null +++ b/arch_src/pyalsaaudio-0.2/doc/.svn/wcprops/about.html.svn-work @@ -0,0 +1,5 @@ +K 25 +svn:wc:ra_dav:version-url +V 64 +/svn/Shtoom/!svn/ver/1585/trunk/audio/pyalsaaudio/doc/about.html +END diff --git 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