[asterisk-bugs] [JIRA] (ASTERISK-22758) Support for A-law and u-law WAV file format

[Michael Walton (JIRA)]

Michael Walton created ASTERISK-22758:
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             Summary: Support for A-law and u-law WAV file format
                 Key: ASTERISK-22758
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-22758
             Project: Asterisk
          Issue Type: Improvement
      Security Level: None
          Components: Formats/format_wav
    Affects Versions: SVN
         Environment: Any
            Reporter: Michael Walton
            Severity: Minor


The WAV file formatter (format_wav) has never supported A-law or u-law encoded WAV files. This patch adds A-law and u-law WAV file read and write support to the format_wav module.

 * Ideal for web and e-mail delivery of voice recordings, because it cuts down the recorded file size for e-mail or web delivery by 50% compared to 16-bit PCM WAV, with no discernible loss in quality. 
 * The existing format_pcm can do u-law and A-law, but does not do WAV framing, making the files incompatible with most common media players. 
 * The existing format_wav_gsm is commonly used for e-mail delivery, but we all know about GSM codec quality
 * Defines the following new format extensions:
 ** wava - A-law WAV
 ** wavu - u-law WAV
 ** wavs - 16-bit linear WAV

The default .wav format after applying this patch is u-law (replacing 16-bit PCM), but the 16-bit PCM is retained as wavs


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