Update Speex AEC to the latest version to get multichannel EC

[pjsipbot]

2008-08-09 06:44:11: @bennylp created the issue on trac ticket 589

Ticket #588 rolled-back Speex AEC to beta3 version which does not support multi-channel EC, so we need to update it to the latest version to support multi-channel.

Testing is done with pjsua on Mac with the following setups: No echo cancellation at all (ec-tail = 0), stereo mode, and mono mode.

For stereo mode, you can clearly observe some echo cancellation compared to the testing without ec, however you can also still notice some uncancelled echo. And this is especially more noticeable after you compare it with mono testing, where the AEC seems to work pretty well and manages to cancel most of the echo.

Note that this ticket only updates the Speex DSP part to version 1.2, but leaves the codec part untouched.

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2008-09-09 14:32:33: @bennylp changed milestone from release-1.0-rc2 to release-1.0-rc3

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2008-09-19 23:49:15: @bennylp changed milestone from release-1.0-rc3 to Known-Issues

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2018-02-08 02:28:15: @nanangizz changed milestone from Known-Issues-and-Ideas to release-2.9

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2020-01-09 09:05:52: @mingteluu changed status from new to closed

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2020-01-09 09:05:52: @mingteluu set resolution to fixed

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2020-01-09 09:05:52: @mingteluu commented

In r6129:
Closed #589: Update Speex AEC to the latest version to get multichannel EC

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2020-01-09 09:12:14: @mingteluu edited the issue description

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2020-01-09 10:09:51: @mingteluu commented

In r6130:
Re #589: Fixed missing include file

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2020-01-16 09:13:36: @trengginas commented

In r6135:
Re #589: Add scal.c to Visual Studio project files.

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2020-01-29 04:29:16: @mingteluu commented

In r6143:
Re #589: Suppresses warning of unused var