[RFC PATCH v8 00/13] Add audio support in v4l2 framework

Wed Nov 1 22:05:56 AEDT 2023

On Mon, Oct 30, 2023 at 9:56 AM Shengjiu Wang <shengjiu.wang at gmail.com> wrote:
>
> On Fri, Oct 27, 2023 at 7:18 PM Hans Verkuil <hverkuil at xs4all.nl> wrote:
> >
> > Hi Shengjiu,
> >
> > Is there a reason why this series is still marked RFC?
> >
> > Just wondering about that.
>
> In the very beginning I started this series with RFC, So
> I still use RFC now...
>

Should I resend patches which remove the 'RFC'?

Best regards
Wang shengjiu

> >
> > Regards,
> >
> >         Hans
> >
> > On 27/10/2023 12:35, Shengjiu Wang wrote:
> > > Audio signal processing also has the requirement for memory to
> > > memory similar as Video.
> > >
> > > This asrc memory to memory (memory ->asrc->memory) case is a non
> > > real time use case.
> > >
> > > User fills the input buffer to the asrc module, after conversion, then asrc
> > > sends back the output buffer to user. So it is not a traditional ALSA playback
> > > and capture case.
> > >
> > > It is a specific use case,  there is no reference in current kernel.
> > > v4l2 memory to memory is the closed implementation,  v4l2 current
> > > support video, image, radio, tuner, touch devices, so it is not
> > > complicated to add support for this specific audio case.
> > >
> > > Because we had implemented the "memory -> asrc ->i2s device-> codec"
> > > use case in ALSA.  Now the "memory->asrc->memory" needs
> > > to reuse the code in asrc driver, so the first 3 patches is for refining
> > > the code to make it can be shared by the "memory->asrc->memory"
> > > driver.
> > >
> > > The main change is in the v4l2 side, A /dev/vl4-audioX will be created,
> > > user applications only use the ioctl of v4l2 framework.
> > >
> > > Other change is to add memory to memory support for two kinds of i.MX ASRC
> > > module.
> > >
> > > changes in v8:
> > > - refine V4L2_CAP_AUDIO_M2M to be 0x00000008
> > > - update doc for FIXED_POINT
> > > - address comments for imx-asrc
> > >
> > > changes in v7:
> > > - add acked-by from Mark
> > > - separate commit for fixed point, m2m audio class, audio rate controls
> > > - use INTEGER_MENU for rate,  FIXED_POINT for rate offset
> > > - remove used fmts
> > > - address other comments for Hans
> > >
> > > changes in v6:
> > > - use m2m_prepare/m2m_unprepare/m2m_start/m2m_stop to replace
> > >   m2m_start_part_one/m2m_stop_part_one, m2m_start_part_two/m2m_stop_part_two.
> > > - change V4L2_CTRL_TYPE_ASRC_RATE to V4L2_CTRL_TYPE_FIXED_POINT
> > > - fix warning by kernel test rebot
> > > - remove some unused format V4L2_AUDIO_FMT_XX
> > > - Get SNDRV_PCM_FORMAT from V4L2_AUDIO_FMT in driver.
> > > - rename audm2m to viaudm2m.
> > >
> > > changes in v5:
> > > - remove V4L2_AUDIO_FMT_LPCM
> > > - define audio pixel format like V4L2_AUDIO_FMT_S8...
> > > - remove rate and format in struct v4l2_audio_format.
> > > - Add V4L2_CID_ASRC_SOURCE_RATE and V4L2_CID_ASRC_DEST_RATE controls
> > > - updata document accordingly.
> > >
> > > changes in v4:
> > > - update document style
> > > - separate V4L2_AUDIO_FMT_LPCM and V4L2_CAP_AUDIO_M2M in separate commit
> > >
> > > changes in v3:
> > > - Modify documents for adding audio m2m support
> > > - Add audio virtual m2m driver
> > > - Defined V4L2_AUDIO_FMT_LPCM format type for audio.
> > > - Defined V4L2_CAP_AUDIO_M2M capability type for audio m2m case.
> > > - with modification in v4l-utils, pass v4l2-compliance test.
> > >
> > > changes in v2:
> > > - decouple the implementation in v4l2 and ALSA
> > > - implement the memory to memory driver as a platfrom driver
> > >   and move it to driver/media
> > > - move fsl_asrc_common.h to include/sound folder
> > >
> > > Shengjiu Wang (13):
> > >   ASoC: fsl_asrc: define functions for memory to memory usage
> > >   ASoC: fsl_easrc: define functions for memory to memory usage
> > >   ASoC: fsl_asrc: move fsl_asrc_common.h to include/sound
> > >   ASoC: fsl_asrc: register m2m platform device
> > >   ASoC: fsl_easrc: register m2m platform device
> > >   media: uapi: Add V4L2_CAP_AUDIO_M2M capability flag
> > >   media: v4l2: Add audio capture and output support
> > >   media: uapi: Define audio sample format fourcc type
> > >   media: uapi: Add V4L2_CTRL_CLASS_M2M_AUDIO
> > >   media: uapi: Add V4L2_CTRL_TYPE_FIXED_POINT
> > >   media: uapi: Add audio rate controls support
> > >   media: imx-asrc: Add memory to memory driver
> > >   media: vim2m_audio: add virtual driver for audio memory to memory
> > >
> > >  .../userspace-api/media/v4l/buffer.rst        |    6 +
> > >  .../userspace-api/media/v4l/common.rst        |    1 +
> > >  .../media/v4l/dev-audio-mem2mem.rst           |   71 +
> > >  .../userspace-api/media/v4l/devices.rst       |    1 +
> > >  .../media/v4l/ext-ctrls-audio-m2m.rst         |   41 +
> > >  .../userspace-api/media/v4l/pixfmt-audio.rst  |   87 ++
> > >  .../userspace-api/media/v4l/pixfmt.rst        |    1 +
> > >  .../media/v4l/vidioc-enum-fmt.rst             |    2 +
> > >  .../media/v4l/vidioc-g-ext-ctrls.rst          |   17 +-
> > >  .../userspace-api/media/v4l/vidioc-g-fmt.rst  |    4 +
> > >  .../media/v4l/vidioc-querycap.rst             |    3 +
> > >  .../media/v4l/vidioc-queryctrl.rst            |    9 +-
> > >  .../media/videodev2.h.rst.exceptions          |    4 +
> > >  .../media/common/videobuf2/videobuf2-v4l2.c   |    4 +
> > >  drivers/media/platform/nxp/Kconfig            |   12 +
> > >  drivers/media/platform/nxp/Makefile           |    1 +
> > >  drivers/media/platform/nxp/imx-asrc.c         | 1186 +++++++++++++++++
> > >  drivers/media/test-drivers/Kconfig            |    9 +
> > >  drivers/media/test-drivers/Makefile           |    1 +
> > >  drivers/media/test-drivers/vim2m_audio.c      |  680 ++++++++++
> > >  drivers/media/v4l2-core/v4l2-ctrls-api.c      |    5 +-
> > >  drivers/media/v4l2-core/v4l2-ctrls-core.c     |    2 +
> > >  drivers/media/v4l2-core/v4l2-ctrls-defs.c     |   16 +
> > >  drivers/media/v4l2-core/v4l2-dev.c            |   17 +
> > >  drivers/media/v4l2-core/v4l2-ioctl.c          |   66 +
> > >  include/media/v4l2-dev.h                      |    2 +
> > >  include/media/v4l2-ioctl.h                    |   34 +
> > >  .../fsl => include/sound}/fsl_asrc_common.h   |   60 +
> > >  include/uapi/linux/v4l2-controls.h            |    9 +
> > >  include/uapi/linux/videodev2.h                |   42 +
> > >  sound/soc/fsl/fsl_asrc.c                      |  144 ++
> > >  sound/soc/fsl/fsl_asrc.h                      |    4 +-
> > >  sound/soc/fsl/fsl_asrc_dma.c                  |    2 +-
> > >  sound/soc/fsl/fsl_easrc.c                     |  233 ++++
> > >  sound/soc/fsl/fsl_easrc.h                     |    6 +-
> > >  35 files changed, 2771 insertions(+), 11 deletions(-)
> > >  create mode 100644 Documentation/userspace-api/media/v4l/dev-audio-mem2mem.rst
> > >  create mode 100644 Documentation/userspace-api/media/v4l/ext-ctrls-audio-m2m.rst
> > >  create mode 100644 Documentation/userspace-api/media/v4l/pixfmt-audio.rst
> > >  create mode 100644 drivers/media/platform/nxp/imx-asrc.c
> > >  create mode 100644 drivers/media/test-drivers/vim2m_audio.c
> > >  rename {sound/soc/fsl => include/sound}/fsl_asrc_common.h (60%)
> > >
> >