[asterisk-bugs] [JIRA] (ASTERISK-25599) [patch] SLIN Resampling Codec only 80 msec

[Alexander Traud (JIRA)]

Alexander Traud created ASTERISK-25599:
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             Summary: [patch] SLIN Resampling Codec only 80 msec
                 Key: ASTERISK-25599
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25599
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Codecs/codec_resample
    Affects Versions: 13.6.0, 11.20.0
            Reporter: Alexander Traud
            Severity: Minor


{{WARNING: translate.c:402 Out of buffer space}}

Currently, {{codecs/codec_resample.c}} uses a buffer with a fixed size of 8096 for each signed-linear resolution. Furthermore, these 8096 depend on the size of {{int16_t}} of the platform. On my machine, this results in a maximum of 4048 samples. However for example, the Opus Codec is able to create 5760 samples (6 frames a 20 milliseconds @ 48000 samples per second). Consequently, the current buffer is too small for the Opus Codec when used with a packetization time of more than 80 milliseconds, for example in chan_sip with sip.conf: {{allow=opus:120}} or {{autoframing=yes}}.

The attached patch uses the maximum of the Opus Codec (5760) as the new minimum sample amount. Therefore, the actual amount of bytes must depend on {{int16_t}} and not the other way around. This guarantees we are able to convert at least 5760 samples, regardless of the platform.



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