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

[Michael Walton (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-22758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Walton updated ASTERISK-22758:
--------------------------------------

    Attachment: format_wav.c.r364580.xlaw.patch

Patch for format_wav.c r364580 (svn HEAD) to add A-law and u-law capability
                
> 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
>         Attachments: format_wav.c.r364580.xlaw.patch
>
>
> 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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