JulienB: creation

2009-12-30T15:03:19Z

creation

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Taken from http://www.speex.org/ : ''Speex is an Open Source/Free Software patent-free audio compression format designed for speech. The Speex Project aims to lower the barrier of entry for voice applications by providing a free alternative to expensive proprietary speech codecs.''

==Installation==
* Select the package in Buildroot menuconfig:
<pre class="host">
$ make menuconfig
</pre>
<pre class="config">
Package Selection for the target --->
Audio libraries and applications --->
[*] speex
</pre>
* Compile
<pre class="host">
$ make
</pre>
* Reflash your rootfs

==Usage==
Speex can be used from shell, thanks to the ''speexenc'' and ''speexdec'' command line tools:
* If [[ALSA|ALSA Audio In]] was setup correctly, record a sound
<pre class="apf">
# arecord /tmp/toto.wav
Recording WAVE '/tmp/toto.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono
</pre>
* Then compress it:
<pre class="apf">
# speexenc /tmp/toto.wav /tmp/toto.spx
Encoding 8000 Hz audio using narrowband mode (mono)

# ls -al /tmp/toto.*
-rw-r--r-- 1 root root 13303 Jan 1 01:24 /tmp/toto.spx
-rw-r--r-- 1 root root 53292 Jan 1 01:23 /tmp/toto.wav
</pre>
* To decompress it to a file:
<pre class="apf">
# speexdec /tmp/toto.spx /tmp/toto_dec.wav
Decoding 8000 Hz audio using narrowband mode (mono)
Encoded with Speex 1.2rc1
</pre>
* To decompress it and play it "on the fly" (needs OSS emulation):
<pre class="apf">
# modprobe snd-pcm-oss
# modprobe snd-mixer-oss
</pre>
<pre class="apf">
# speexdec /tmp/toto.spx
</pre>

==Programming with Speex==
http://www.speex.org/docs/manual/speex-manual/node7.html

==Links==
* http://www.speex.org/docs/manual/speex-manual/

[[Category:Audio]]

Speex - Revision history

JulienB: creation