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2021-06-02force pcm_open to open device with the non-blocking flagdvdli
When a client opens a PCM device whose substreams are all occupied without the non-blocking flag, the open function would be blocked in the kernel until the previous opened ones are closed. This would cause deadlock if they try to hold the same lock. Most of the ALSA PCM drivers on embedded systems are implemented with the ALSA SOC framework. Each PCM device has only one substream. This problem would happen frequently. To force pcm_open to open PCM devices with non-blocking flag is beneficial to resolve this problem. It returns the control to clients to try again later. The reason why we don't call pcm_open with PCM_NONBLOCK is that the PCM_NONBLOCK also affects the read and write behaviors. I also add a test case to test whether the pcm_open would be blocked.
2021-05-19refine null parameters checking and add a unit test casedvdli
2021-03-22fix bug in testsdvdli
2021-03-10add a loopback test for floating point PCMdvdli
2021-02-22support float config and float wave file playbackdvdli
2021-01-28fix test case to match the APIdvdli
2021-01-28Let pcm_mmap_read/write call pcm_readi/writeidvdli
The pcm_readi and pcm_writei also can deal with the mmap read/write. Also mark the pcm_mmap_read/write functions as deprecated functions and update the test case. Add mmap playback support to tinyplay
2021-01-28prepare in pcm_generic_transferdvdli
2021-01-12remove pcm_prepare in pcm_opendvdli
For the dynamic pcm device, it is valid to specify the backend after opening it. However, it is invalid to call prepare on a dynamic pcm device without connecting any backend device. We should not do pcm_prepare in pcm_open. See also: Issue #197
2020-12-02fix typo, add comments to describe the tests and fix the loopback testdvdli
2020-11-26add unit testsdvdli
1. add mixer event test 2. add pcm capturing test 3. add pcm loopback test
2020-11-23add unit tests for mixer related functionsdvdli
2020-11-16add unit tests for pcm_* functionsdvdli