[asterisk-bugs] [JIRA] (ASTERISK-29455) Local channels play back gsm files over ulaw files when both exist

[N A (JIRA)]

N A created ASTERISK-29455:
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             Summary: Local channels play back gsm files over ulaw files when both exist
                 Key: ASTERISK-29455
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-29455
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Codecs/General
    Affects Versions: 18.4.0
            Reporter: N A


Strange issue with codec conversion that I noticed today. Despite the translation costs of slin192 <-> ulaw and slin192 <-> gsm being identical, an slin192 will pick a gsm audio file if both a gsm and ulaw candidate exist for a specific file. It plays ulaw files correctly if there isn't a candidate (same name) gsm file.

The correct behavior should be that ulaw is preferred over gsm, since the costs are identical, and ulaw is the higher quality codec, and being both uncompressed and raw audio, closer to slin format than gsm would be. Yet, it falls back to the lower quality codec for some reason which seems arbitrary.

An analysis of the ast_translator_build_path() function in channel.c along with DEBUG messages confirms the problem occurs here, and likely the actual bug lies with the ast_translator_best_choice function in translate.c.



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