This repo is a fork of the original one with the bondagit patches applied to the aes67-daemon branch
- removed ravenna-alsa-lkm driver patches from the repo
Removed driver copy_user(), copy_kernel() and fill_silence() ops.
Removed user space buffer transfer handling mode from playback and capture copy_internal() functions.
The problem arises from pre-buffering performed after ALSA prepare and before ALSA start trigger-
The patch enables the early startup of the audio playback interrupt and disables the cleanup (mute) of the playback buffer.
This issue can be reproduced using the test suite developed to investigate #17 and by removing the (-M) option from aplay in run_test.sh script.
Issue is in the mr_alsa_audio_pcm_playback_copy_internal() function of audio_driver.c that transfers the PCM samples from the ALSA buffer to the Ravenna buffer using the get_user() function.
In case of memory access mode the ALSA buffer can be directly accessed by the kernel and the samples must be copied.
mr_alsa_audio_pcm_playback_copy_internal() has been modified to handle the transfer of the ALSA buffer from user space (used with read/write access mode) and from kernel space (used by memory access mode).
The issue is common to all the platform but impacting ARM only.
Additional changes:
- changed type for dma_playback_offset and dma_capture_offset variables to uint32_t instead of atomic_t since the pointer callback mr_alsa_audio_pcm_pointer() is now atomic
- added variables to the mr_alsa_audio_chip scructure to decrease the number of calls to snd_pcm_lib_xxx() functions. These get assigned in the prepare callback mr_alsa_audio_pcm_prepare()
- changed mr_alsa_audio_get_playback_buffer_size_in_frames() to return configured size of Ravenna playback buffer (same as mr_alsa_audio_get_capture_buffer_size_in_frames())
- some rework of the existing patches
This fixes issue #20
PCM samples are transferred by the PCM interrupt routine from the memory of the ALSA playback device to the RAVENNA buffer and from the RAVENNA buffer to the memory of the ALSA capture device.
This patch will enabled the use of the ALSA plugins and it has been testes with the ALSA Dmix plugin.
This patch applies to issues #7 and #15.
This is the same approach already used with Linux Kernel 4.x, but in Linux Kernel 5.x tasklet_hrtimer helper functions were removed.
This fixes issue #12
- removed changes to driver/MTAL_LKernelAPI.c in ravenna-alsa-lkm-kernel-v5.patch
- added patch ravenna-alsa-lkm-disable-ptp-checksum.patch to the driver to the disable UDP checksum verification for the incoming PTP packets
- changed build.sh script to use new driver revision and apply the new patch
- added handling of the sink status flag "all_muted" in daemon, WebUI and regression tests
- updated documentation
- added patch to ravenna-alsa-lkm module to support AM824 codec and associated conversion functions
- added support for AM824 codec to daemon and in WebUI
- modifed demo to test 8 channels of AM824 with 6 samples per packet @ 48Khz (125us x packet)
- added patch to ALSA RAVENNA/AES67 Driver
- switched to CLANG compiler in order to compile the daemon succesfully
- disabled valgind memory check in daemon regression tests for ARM.
Demo and daemon regression test work properly.
Tests have been executed on the BeagleBone® Black board with ARM Cortex-A8 32-Bit and Ubuntu 18.04 distro
