[GSOC 2016] HD Audio Emulation For Bhyve Status

[Alex Teaca]

Hi

I finished to implement the ADC feature so I am able to record samples from
a mic. I tested in both Linux and Windows (arecord from alsa, and Sound
Recorder from windows) and it goes well.

Redesigned the hda_codec that it allows to provide either ADC, DAC or both
of them by config. Basically, if you want only playback emulation just add:

-s 5:0,hda,play=/dev/dsp[%d]

The general configuration is: -s 5:0,hda,rec=/dev/dsp[%d],play=/dev/dsp[%d]

I want to fix some coding style issues, write the documentation and prepare
the Work Product Submission required by Google.

Thanks,
Alex


On Sat, Jul 30, 2016 at 10:56 AM, Alex Teaca <ionutalex.teaca at gmail.com>
wrote:

> Hi,
>
> Meanwhile I have added some small functionalities in order to make it work
> with Linux and Windows virtual machines. The difficult part was rather to
> find the right setup to run Windows properly.
>
> Now, it works playing audio on FreeBSD, Linux (ubuntu 14.04 server) and
> Windows 2k8 server guests. One limitation I still have is the necessity to
> use hw.snd.latency=0 when play with Windows.
>
> I am working at the input features in order to capture audio.
>
> Thanks,
> Alex
>
>
> On Sun, Jun 26, 2016 at 8:49 PM, Alex Teaca <ionutalex.teaca at gmail.com>
> wrote:
>
>> Hi,
>>
>> Short update.
>>
>> - implement the stream management operations (stream_start, stream_stop,
>> hda stream interrupts, hda_transfer) in the hda and hda codec
>> - create one thread per stream in the initialization of the codec which
>> runs as long as the stream is started and waits on a conditional variable
>> when the stream is stopped.
>> - implement the Audio Player used to play samples to the sound device
>> (/dev/dsp) (3 functions: audio_init, audio_set_params and audio_playback)
>>
>> Results: manage to play music in a bhyve virtual machine :)
>>
>> Thanks,
>> Alex
>>
>>
>> On Fri, Jun 17, 2016 at 9:52 PM, Alex Teaca <ionutalex.teaca at gmail.com>
>> wrote:
>>
>>> Hi,
>>>
>>> I added a pin widget (Line-out) and now the Audio Output Widget is
>>> enabled. The codec is installed as pcm0:
>>> root at vm_hda:~ # cat /dev/sndstat
>>> Installed devices:
>>> pcm0: <Generic (0x8086) (Analog Line-out)> (play) default
>>>
>>> The next step is to implement the stream management operations such as
>>> start_stream and stop_stream. I have taken a look on the Stream management
>>> chapter from the HDA specification in order to get familiar with these
>>> operations and study the driver implementation (hdaa_audio_setup,
>>> hdac_stream_start, hdac_stream_stop) to see what registers are programmed
>>> and what commands are sent to the codec.
>>>
>>> Together with Peter and Alexander we chose the design of the interaction
>>> between the HDA controller, codecs and Audio player regarding the stream
>>> management.
>>>
>>> Thanks,
>>> Alex
>>>
>>>
>>> On Mon, Jun 6, 2016 at 10:01 PM, Alex Teaca <ionutalex.teaca at gmail.com>
>>> wrote:
>>>
>>>> Hi,
>>>>
>>>> Here is the status with the features I have implemented so far.
>>>>
>>>>  - set up the HDA controller as a PCI device in bhyve
>>>>  - design the layout of registers and implement the read and write
>>>> access to the registers
>>>>  - implement the CORB and RIRB mechanisms in order to get commands from
>>>> driver and respond back
>>>>  - add the hdac_codec module and implement the interface of
>>>> communication between the hda controller and codec
>>>>  - describe the hda codec parameters for each node (ROOT, FG and AUDIO
>>>> OUTPUT)
>>>>  - handle the GET_PARAMETER verb
>>>>
>>>> At the moment there is only one widget: the Autio Output Widget and the
>>>> hda driver has disabled it because it does not find any Pin widget.
>>>>
>>>> The plan is to add the Pin output widget and to continue with the
>>>> streams data in order to play some samples.
>>>>
>>>> Thanks,
>>>> Alex
>>>>
>>>>
>>>
>>
>