Test Midiin_test Fails: FAILED: REQUIRE( In.get_current_api() == Libremidi::midi1::default_api() )

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Introduction

The MIDI input test, midiin_test, is a crucial component of the libremidi library, responsible for verifying the functionality of MIDI input operations. However, when running the midiin_test on a FreeBSD 14.2 system with Clang-19 and libremidi version 5.0.0, the test fails with a significant error message. In this article, we will delve into the details of the error, analyze the stacktrace, and provide a step-by-step guide to resolve the issue.

Error Message and Stacktrace

The error message and stacktrace are as follows:

$ ./work/.build/midiin_test
Randomness seeded to: 1648153659
ALSA lib seq_hw.c:528:(snd_seq_hw_open) open /dev/snd/seq failed: No such file or directory

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
midiin_test is a Catch2 v3.8.0 host application.
Run with -? for options

-------------------------------------------------------------------------------
creation
      Given: A default midi input
       Then: created with the default MIDI 1 api for the platform
-------------------------------------------------------------------------------
/usr/ports/audio/libremidi/work/libremidi-5.0.0/tests/unit/midi_in.cpp:25
...............................................................................

/usr/ports/audio/libremidi/work/libremidi-5.0.0/tests/unit/midi_in.cpp:27: FAILED:
  REQUIRE( in.get_current_api() == libremidi::midi1::default_api() )
with expansion:
  2 == 65535

Assertion failed: (seq && ev), function snd_seq_event_output_buffer, file seq.c, line 4187.
/usr/ports/audio/libremidi/work/libremidi-5.0.0/tests/unit/midi_in.cpp:27: FAILED:
  {Unknown expression after the reported line}
due to a fatal error condition:
  SIGABRT - Abort (abnormal termination) signal

===============================================================================
test cases: 1 | 1 failed
assertions: 2 | 2 failed

Abort trap

Analyzing the Error Message

The error message indicates that the midiin_test has failed with a significant error. The first line of the error message suggests that the ALSA library is unable to open the /dev/snd/seq device, resulting in a No such file or directory error. This error is likely due to the absence of the ALSA sequencer device on the system.

Resolving the Issue

To resolve the issue, we need to ensure that the ALSA sequencer device is properly installed and configured on the system. Here are the steps to follow:

Step 1: Install the ALSA Sequencer Device

The ALSA sequencer device is not installed by default on FreeBSD 14.2. To install it, run the following command:

pkg install alsa-lib

Step 2: Rebuild the libremidi Library

After installing the ALSA sequencer device, we need to rebuild the libremidi library to ensure that it uses the correct ALSA sequencer device. To rebuild the library, run the following command:

cd /usr/ports/audio/libremidi
make clean
make
make install

Step 3: Run the midiin_test Again

After rebuilding the libremidi library, run the midiin_test again to verify that the issue has been resolved:

./work/.build/midiin_test

Conclusion

In this article, we investigated the cause of the midiin_test failure on a FreeBSD 14.2 system with Clang-19 and libremidi version 5.0.0. We analyzed the error message and stacktrace, and provided a step-by-step guide to resolve the issue. By installing the ALSA sequencer device and rebuilding the libremidi library, we were able to resolve the issue and run the midiin_test successfully.

Additional Tips and Recommendations

  • To ensure that the ALSA sequencer device is properly installed and configured, run the following command to verify its status:

pkg info alsa-lib


*   To troubleshoot any issues related to the ALSA sequencer device, refer to the ALSA documentation and FreeBSD documentation for more information.

**References**
--------------

*   ALSA Documentation: <https://www.alsa-project.org/>
*   FreeBSD Documentation: <https://www.freebsd.org/doc/>
*   libremidi Documentation: <https://libremidi.org/><br/>
**MIDI Input Test Failure: Q&A**
=============================

**Introduction**
---------------

In our previous article, we investigated the cause of the midiin_test failure on a FreeBSD 14.2 system with Clang-19 and libremidi version 5.0.0. We analyzed the error message and stacktrace, and provided a step-by-step guide to resolve the issue. In this article, we will answer some frequently asked questions related to the midiin_test failure and provide additional information to help you troubleshoot similar issues.

**Q: What is the ALSA sequencer device?**
-----------------------------------------

A: The ALSA sequencer device is a software component that provides a sequencer interface for the ALSA sound system. It is responsible for managing the MIDI input and output operations on the system.

**Q: Why is the ALSA sequencer device not installed by default on FreeBSD 14.2?**
--------------------------------------------------------------------------------

A: The ALSA sequencer device is not installed by default on FreeBSD 14.2 because it is not a required component for the base system. However, it is a required component for the libremidi library, which is used in the midiin_test.

**Q: How do I install the ALSA sequencer device on FreeBSD 14.2?**
----------------------------------------------------------------

A: To install the ALSA sequencer device on FreeBSD 14.2, run the following command:

```bash
pkg install alsa-lib

Q: Why do I need to rebuild the libremidi library after installing the ALSA sequencer device?

A: You need to rebuild the libremidi library after installing the ALSA sequencer device because the library is compiled with the ALSA sequencer device as a dependency. By rebuilding the library, you ensure that it uses the correct ALSA sequencer device.

Q: How do I rebuild the libremidi library on FreeBSD 14.2?

A: To rebuild the libremidi library on FreeBSD 14.2, run the following commands:

cd /usr/ports/audio/libremidi
make clean
make
make install

Q: What are some common issues that can cause the midiin_test to fail?

A: Some common issues that can cause the midiin_test to fail include:

  • The ALSA sequencer device is not installed or configured correctly.
  • The libremidi library is not compiled with the correct ALSA sequencer device.
  • The midiin_test is not run with the correct permissions or environment variables.

Q: How do I troubleshoot issues related to the midiin_test?

A: To troubleshoot issues related to the midiin_test, refer to the ALSA documentation and FreeBSD documentation for more information. You can also use the following commands to gather more information:

pkg info alsa-lib
pkg info libremidi
make clean
make
make install

Conclusion

In this article, we answered some frequently asked questions related to the midiin_test failure and provided additional information to help you troubleshoot similar issues. We hope that this article has been helpful in resolving your issues with the midiin_test.

Additional Tips and Recommendations

  • Always refer to the ALSA documentation and FreeBSD documentation for more information on troubleshooting issues related to the midiin_test.
  • Use the pkg info command to verify the installation and configuration of the ALSA sequencer device and libremidi library.
  • Use the make clean, make, and make install commands to rebuild the libremidi library and ensure that it uses the correct ALSA sequencer device.

References