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 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 (11): 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: uapi: Add V4L2_AUDIO_FMT_LPCM fourcc format media: v4l2: Add audio capture and output support media: uapi: Add V4L2_CID_USER_IMX_ASRC_RATIO_MOD control media: audm2m: add virtual driver for audio memory to memory media: imx-asrc: Add memory to memory driver
.../userspace-api/media/v4l/audio-formats.rst | 15 + .../userspace-api/media/v4l/buffer.rst | 6 + .../userspace-api/media/v4l/control.rst | 5 + .../userspace-api/media/v4l/dev-audio.rst | 63 + .../userspace-api/media/v4l/devices.rst | 1 + .../media/v4l/pixfmt-aud-lpcm.rst | 61 + .../userspace-api/media/v4l/pixfmt.rst | 1 + .../media/v4l/vidioc-enum-fmt.rst | 2 + .../userspace-api/media/v4l/vidioc-g-fmt.rst | 4 + .../media/v4l/vidioc-querycap.rst | 3 + .../media/videodev2.h.rst.exceptions | 3 + .../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 | 1058 +++++++++++++++++ drivers/media/test-drivers/Kconfig | 9 + drivers/media/test-drivers/Makefile | 1 + drivers/media/test-drivers/audm2m.c | 767 ++++++++++++ drivers/media/v4l2-core/v4l2-ctrls-defs.c | 1 + drivers/media/v4l2-core/v4l2-dev.c | 17 + drivers/media/v4l2-core/v4l2-ioctl.c | 53 + include/media/v4l2-dev.h | 2 + include/media/v4l2-ioctl.h | 34 + .../fsl => include/sound}/fsl_asrc_common.h | 54 + include/uapi/linux/v4l2-controls.h | 1 + include/uapi/linux/videodev2.h | 25 + sound/soc/fsl/fsl_asrc.c | 162 +++ sound/soc/fsl/fsl_asrc.h | 4 +- sound/soc/fsl/fsl_asrc_dma.c | 2 +- sound/soc/fsl/fsl_easrc.c | 239 ++++ sound/soc/fsl/fsl_easrc.h | 8 +- 31 files changed, 2615 insertions(+), 3 deletions(-) create mode 100644 Documentation/userspace-api/media/v4l/audio-formats.rst create mode 100644 Documentation/userspace-api/media/v4l/dev-audio.rst create mode 100644 Documentation/userspace-api/media/v4l/pixfmt-aud-lpcm.rst create mode 100644 drivers/media/platform/nxp/imx-asrc.c create mode 100644 drivers/media/test-drivers/audm2m.c rename {sound/soc/fsl => include/sound}/fsl_asrc_common.h (60%)