| Message ID | 1699595289-25773-8-git-send-email-shengjiu.wang@nxp.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add audio support in v4l2 framework | expand |
Hi Shengjiu, On 10/11/2023 06:48, Shengjiu Wang wrote: > Audio signal processing has the requirement for memory to > memory similar as Video. > > This patch is to add this support in v4l2 framework, defined > new buffer type V4L2_BUF_TYPE_AUDIO_CAPTURE and > V4L2_BUF_TYPE_AUDIO_OUTPUT, defined new format v4l2_audio_format > for audio case usage. > > The created audio device is named "/dev/v4l-audioX". > > Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com> > --- > .../userspace-api/media/v4l/buffer.rst | 6 ++ > .../media/v4l/dev-audio-mem2mem.rst | 71 +++++++++++++++++++ > .../userspace-api/media/v4l/devices.rst | 1 + > .../media/v4l/vidioc-enum-fmt.rst | 2 + > .../userspace-api/media/v4l/vidioc-g-fmt.rst | 4 ++ > .../media/videodev2.h.rst.exceptions | 2 + > .../media/common/videobuf2/videobuf2-v4l2.c | 4 ++ > 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 +++++++++ > include/uapi/linux/videodev2.h | 17 +++++ > 12 files changed, 213 insertions(+) > create mode 100644 Documentation/userspace-api/media/v4l/dev-audio-mem2mem.rst While testing this patch series I discovered that you also need to patch drivers/media/v4l2-core/v4l2-compat-ioctl32.c so it knows about the new audio format. Without that 32 bit apps will fail with a 64 bit kernel. Regards, Hans > > diff --git a/Documentation/userspace-api/media/v4l/buffer.rst b/Documentation/userspace-api/media/v4l/buffer.rst > index 52bbee81c080..a3754ca6f0d6 100644 > --- a/Documentation/userspace-api/media/v4l/buffer.rst > +++ b/Documentation/userspace-api/media/v4l/buffer.rst > @@ -438,6 +438,12 @@ enum v4l2_buf_type > * - ``V4L2_BUF_TYPE_META_OUTPUT`` > - 14 > - Buffer for metadata output, see :ref:`metadata`. > + * - ``V4L2_BUF_TYPE_AUDIO_CAPTURE`` > + - 15 > + - Buffer for audio capture, see :ref:`audio`. > + * - ``V4L2_BUF_TYPE_AUDIO_OUTPUT`` > + - 16 > + - Buffer for audio output, see :ref:`audio`. > > > .. _buffer-flags: > diff --git a/Documentation/userspace-api/media/v4l/dev-audio-mem2mem.rst b/Documentation/userspace-api/media/v4l/dev-audio-mem2mem.rst > new file mode 100644 > index 000000000000..68faecfe3a02 > --- /dev/null > +++ b/Documentation/userspace-api/media/v4l/dev-audio-mem2mem.rst > @@ -0,0 +1,71 @@ > +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later > + > +.. _audiomem2mem: > + > +******************************** > +Audio Memory-To-Memory Interface > +******************************** > + > +An audio memory-to-memory device can compress, decompress, transform, or > +otherwise convert audio data from one format into another format, in memory. > +Such memory-to-memory devices set the ``V4L2_CAP_AUDIO_M2M`` capability. > +Examples of memory-to-memory devices are audio codecs, audio preprocessing, > +audio postprocessing. > + > +A memory-to-memory audio node supports both output (sending audio frames from > +memory to the hardware) and capture (receiving the processed audio frames > +from the hardware into memory) stream I/O. An application will have to > +setup the stream I/O for both sides and finally call > +:ref:`VIDIOC_STREAMON <VIDIOC_STREAMON>` for both capture and output to > +start the hardware. > + > +Memory-to-memory devices function as a shared resource: you can > +open the audio node multiple times, each application setting up their > +own properties that are local to the file handle, and each can use > +it independently from the others. The driver will arbitrate access to > +the hardware and reprogram it whenever another file handler gets access. > + > +Audio memory-to-memory devices are accessed through character device > +special files named ``/dev/v4l-audio`` > + > +Querying Capabilities > +===================== > + > +Device nodes supporting the audio memory-to-memory interface set the > +``V4L2_CAP_AUDIO_M2M`` flag in the ``device_caps`` field of the > +:c:type:`v4l2_capability` structure returned by the :c:func:`VIDIOC_QUERYCAP` > +ioctl. > + > +Data Format Negotiation > +======================= > + > +The audio device uses the :ref:`format` ioctls to select the capture format. > +The audio buffer content format is bound to that selected format. In addition > +to the basic :ref:`format` ioctls, the :c:func:`VIDIOC_ENUM_FMT` ioctl must be > +supported as well. > + > +To use the :ref:`format` ioctls applications set the ``type`` field of the > +:c:type:`v4l2_format` structure to ``V4L2_BUF_TYPE_AUDIO_CAPTURE`` or to > +``V4L2_BUF_TYPE_AUDIO_OUTPUT``. Both drivers and applications must set the > +remainder of the :c:type:`v4l2_format` structure to 0. > + > +.. c:type:: v4l2_audio_format > + > +.. tabularcolumns:: |p{1.4cm}|p{2.4cm}|p{13.5cm}| > + > +.. flat-table:: struct v4l2_audio_format > + :header-rows: 0 > + :stub-columns: 0 > + :widths: 1 1 2 > + > + * - __u32 > + - ``pixelformat`` > + - The sample format, set by the application. see :ref:`pixfmt-audio` > + * - __u32 > + - ``channels`` > + - The channel number, set by the application. channel number range is > + [1, 32]. > + * - __u32 > + - ``buffersize`` > + - Maximum buffer size in bytes required for data. The value is set by the > + driver. > diff --git a/Documentation/userspace-api/media/v4l/devices.rst b/Documentation/userspace-api/media/v4l/devices.rst > index 8bfbad65a9d4..758bd90f1c26 100644 > --- a/Documentation/userspace-api/media/v4l/devices.rst > +++ b/Documentation/userspace-api/media/v4l/devices.rst > @@ -24,3 +24,4 @@ Interfaces > dev-event > dev-subdev > dev-meta > + dev-audio-mem2mem > diff --git a/Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst b/Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst > index 000c154b0f98..42deb07f4ff4 100644 > --- a/Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst > +++ b/Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst > @@ -96,6 +96,8 @@ the ``mbus_code`` field is handled differently: > ``V4L2_BUF_TYPE_VIDEO_OVERLAY``, > ``V4L2_BUF_TYPE_SDR_CAPTURE``, > ``V4L2_BUF_TYPE_SDR_OUTPUT``, > + ``V4L2_BUF_TYPE_AUDIO_CAPTURE``, > + ``V4L2_BUF_TYPE_AUDIO_OUTPUT``, > ``V4L2_BUF_TYPE_META_CAPTURE`` and > ``V4L2_BUF_TYPE_META_OUTPUT``. > See :c:type:`v4l2_buf_type`. > diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-fmt.rst b/Documentation/userspace-api/media/v4l/vidioc-g-fmt.rst > index 675c385e5aca..528fd9df41aa 100644 > --- a/Documentation/userspace-api/media/v4l/vidioc-g-fmt.rst > +++ b/Documentation/userspace-api/media/v4l/vidioc-g-fmt.rst > @@ -130,6 +130,10 @@ The format as returned by :ref:`VIDIOC_TRY_FMT <VIDIOC_G_FMT>` must be identical > - ``meta`` > - Definition of a metadata format, see :ref:`meta-formats`, used by > metadata capture devices. > + * - struct :c:type:`v4l2_audio_format` > + - ``audio`` > + - Definition of a audio data format, see :ref:`audiomem2mem`, used by > + audio memory-to-memory devices > * - __u8 > - ``raw_data``\ [200] > - Place holder for future extensions. > diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions > index da6d0b8e4c2c..e61152bb80d1 100644 > --- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions > +++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions > @@ -29,6 +29,8 @@ replace symbol V4L2_FIELD_SEQ_TB :c:type:`v4l2_field` > replace symbol V4L2_FIELD_TOP :c:type:`v4l2_field` > > # Documented enum v4l2_buf_type > +replace symbol V4L2_BUF_TYPE_AUDIO_CAPTURE :c:type:`v4l2_buf_type` > +replace symbol V4L2_BUF_TYPE_AUDIO_OUTPUT :c:type:`v4l2_buf_type` > replace symbol V4L2_BUF_TYPE_META_CAPTURE :c:type:`v4l2_buf_type` > replace symbol V4L2_BUF_TYPE_META_OUTPUT :c:type:`v4l2_buf_type` > replace symbol V4L2_BUF_TYPE_SDR_CAPTURE :c:type:`v4l2_buf_type` > diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c > index c7a54d82a55e..12f2be2773a2 100644 > --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c > +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c > @@ -785,6 +785,10 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) > case V4L2_BUF_TYPE_META_OUTPUT: > requested_sizes[0] = f->fmt.meta.buffersize; > break; > + case V4L2_BUF_TYPE_AUDIO_CAPTURE: > + case V4L2_BUF_TYPE_AUDIO_OUTPUT: > + requested_sizes[0] = f->fmt.audio.buffersize; > + break; > default: > return -EINVAL; > } > diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c > index f81279492682..b92c760b611a 100644 > --- a/drivers/media/v4l2-core/v4l2-dev.c > +++ b/drivers/media/v4l2-core/v4l2-dev.c > @@ -553,6 +553,7 @@ static void determine_valid_ioctls(struct video_device *vdev) > bool is_tch = vdev->vfl_type == VFL_TYPE_TOUCH; > bool is_meta = vdev->vfl_type == VFL_TYPE_VIDEO && > (vdev->device_caps & meta_caps); > + bool is_audio = vdev->vfl_type == VFL_TYPE_AUDIO; > bool is_rx = vdev->vfl_dir != VFL_DIR_TX; > bool is_tx = vdev->vfl_dir != VFL_DIR_RX; > bool is_io_mc = vdev->device_caps & V4L2_CAP_IO_MC; > @@ -664,6 +665,19 @@ static void determine_valid_ioctls(struct video_device *vdev) > SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_meta_out); > SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_meta_out); > } > + if (is_audio && is_rx) { > + /* audio capture specific ioctls */ > + SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_audio_cap); > + SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_audio_cap); > + SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_audio_cap); > + SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_audio_cap); > + } else if (is_audio && is_tx) { > + /* audio output specific ioctls */ > + SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_audio_out); > + SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_audio_out); > + SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_audio_out); > + SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_audio_out); > + } > if (is_vbi) { > /* vbi specific ioctls */ > if ((is_rx && (ops->vidioc_g_fmt_vbi_cap || > @@ -927,6 +941,9 @@ int __video_register_device(struct video_device *vdev, > case VFL_TYPE_TOUCH: > name_base = "v4l-touch"; > break; > + case VFL_TYPE_AUDIO: > + name_base = "v4l-audio"; > + break; > default: > pr_err("%s called with unknown type: %d\n", > __func__, type); > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c > index 9b1de54ce379..1bb03794922a 100644 > --- a/drivers/media/v4l2-core/v4l2-ioctl.c > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c > @@ -188,6 +188,8 @@ const char *v4l2_type_names[] = { > [V4L2_BUF_TYPE_SDR_OUTPUT] = "sdr-out", > [V4L2_BUF_TYPE_META_CAPTURE] = "meta-cap", > [V4L2_BUF_TYPE_META_OUTPUT] = "meta-out", > + [V4L2_BUF_TYPE_AUDIO_CAPTURE] = "audio-cap", > + [V4L2_BUF_TYPE_AUDIO_OUTPUT] = "audio-out", > }; > EXPORT_SYMBOL(v4l2_type_names); > > @@ -276,6 +278,7 @@ static void v4l_print_format(const void *arg, bool write_only) > const struct v4l2_sliced_vbi_format *sliced; > const struct v4l2_window *win; > const struct v4l2_meta_format *meta; > + const struct v4l2_audio_format *audio; > u32 pixelformat; > u32 planes; > unsigned i; > @@ -346,6 +349,13 @@ static void v4l_print_format(const void *arg, bool write_only) > pr_cont(", dataformat=%p4cc, buffersize=%u\n", > &pixelformat, meta->buffersize); > break; > + case V4L2_BUF_TYPE_AUDIO_CAPTURE: > + case V4L2_BUF_TYPE_AUDIO_OUTPUT: > + audio = &p->fmt.audio; > + pixelformat = audio->audioformat; > + pr_cont(", format=%p4cc, channels=%u, buffersize=%u\n", > + &pixelformat, audio->channels, audio->buffersize); > + break; > } > } > > @@ -927,6 +937,7 @@ static int check_fmt(struct file *file, enum v4l2_buf_type type) > bool is_tch = vfd->vfl_type == VFL_TYPE_TOUCH; > bool is_meta = vfd->vfl_type == VFL_TYPE_VIDEO && > (vfd->device_caps & meta_caps); > + bool is_audio = vfd->vfl_type == VFL_TYPE_AUDIO; > bool is_rx = vfd->vfl_dir != VFL_DIR_TX; > bool is_tx = vfd->vfl_dir != VFL_DIR_RX; > > @@ -992,6 +1003,14 @@ static int check_fmt(struct file *file, enum v4l2_buf_type type) > if (is_meta && is_tx && ops->vidioc_g_fmt_meta_out) > return 0; > break; > + case V4L2_BUF_TYPE_AUDIO_CAPTURE: > + if (is_audio && is_rx && ops->vidioc_g_fmt_audio_cap) > + return 0; > + break; > + case V4L2_BUF_TYPE_AUDIO_OUTPUT: > + if (is_audio && is_tx && ops->vidioc_g_fmt_audio_out) > + return 0; > + break; > default: > break; > } > @@ -1597,6 +1616,16 @@ static int v4l_enum_fmt(const struct v4l2_ioctl_ops *ops, > break; > ret = ops->vidioc_enum_fmt_meta_out(file, fh, arg); > break; > + case V4L2_BUF_TYPE_AUDIO_CAPTURE: > + if (unlikely(!ops->vidioc_enum_fmt_audio_cap)) > + break; > + ret = ops->vidioc_enum_fmt_audio_cap(file, fh, arg); > + break; > + case V4L2_BUF_TYPE_AUDIO_OUTPUT: > + if (unlikely(!ops->vidioc_enum_fmt_audio_out)) > + break; > + ret = ops->vidioc_enum_fmt_audio_out(file, fh, arg); > + break; > } > if (ret == 0) > v4l_fill_fmtdesc(p); > @@ -1673,6 +1702,10 @@ static int v4l_g_fmt(const struct v4l2_ioctl_ops *ops, > return ops->vidioc_g_fmt_meta_cap(file, fh, arg); > case V4L2_BUF_TYPE_META_OUTPUT: > return ops->vidioc_g_fmt_meta_out(file, fh, arg); > + case V4L2_BUF_TYPE_AUDIO_CAPTURE: > + return ops->vidioc_g_fmt_audio_cap(file, fh, arg); > + case V4L2_BUF_TYPE_AUDIO_OUTPUT: > + return ops->vidioc_g_fmt_audio_out(file, fh, arg); > } > return -EINVAL; > } > @@ -1784,6 +1817,16 @@ static int v4l_s_fmt(const struct v4l2_ioctl_ops *ops, > break; > memset_after(p, 0, fmt.meta); > return ops->vidioc_s_fmt_meta_out(file, fh, arg); > + case V4L2_BUF_TYPE_AUDIO_CAPTURE: > + if (unlikely(!ops->vidioc_s_fmt_audio_cap)) > + break; > + memset_after(p, 0, fmt.audio); > + return ops->vidioc_s_fmt_audio_cap(file, fh, arg); > + case V4L2_BUF_TYPE_AUDIO_OUTPUT: > + if (unlikely(!ops->vidioc_s_fmt_audio_out)) > + break; > + memset_after(p, 0, fmt.audio); > + return ops->vidioc_s_fmt_audio_out(file, fh, arg); > } > return -EINVAL; > } > @@ -1892,6 +1935,16 @@ static int v4l_try_fmt(const struct v4l2_ioctl_ops *ops, > break; > memset_after(p, 0, fmt.meta); > return ops->vidioc_try_fmt_meta_out(file, fh, arg); > + case V4L2_BUF_TYPE_AUDIO_CAPTURE: > + if (unlikely(!ops->vidioc_try_fmt_audio_cap)) > + break; > + memset_after(p, 0, fmt.audio); > + return ops->vidioc_try_fmt_audio_cap(file, fh, arg); > + case V4L2_BUF_TYPE_AUDIO_OUTPUT: > + if (unlikely(!ops->vidioc_try_fmt_audio_out)) > + break; > + memset_after(p, 0, fmt.audio); > + return ops->vidioc_try_fmt_audio_out(file, fh, arg); > } > return -EINVAL; > } > diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h > index d82dfdbf6e58..82b63f82d43f 100644 > --- a/include/media/v4l2-dev.h > +++ b/include/media/v4l2-dev.h > @@ -30,6 +30,7 @@ > * @VFL_TYPE_SUBDEV: for V4L2 subdevices > * @VFL_TYPE_SDR: for Software Defined Radio tuners > * @VFL_TYPE_TOUCH: for touch sensors > + * @VFL_TYPE_AUDIO: for audio memory-to-memory devices > * @VFL_TYPE_MAX: number of VFL types, must always be last in the enum > */ > enum vfl_devnode_type { > @@ -39,6 +40,7 @@ enum vfl_devnode_type { > VFL_TYPE_SUBDEV, > VFL_TYPE_SDR, > VFL_TYPE_TOUCH, > + VFL_TYPE_AUDIO, > VFL_TYPE_MAX /* Shall be the last one */ > }; > > diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h > index edb733f21604..f840cf740ce1 100644 > --- a/include/media/v4l2-ioctl.h > +++ b/include/media/v4l2-ioctl.h > @@ -45,6 +45,12 @@ struct v4l2_fh; > * @vidioc_enum_fmt_meta_out: pointer to the function that implements > * :ref:`VIDIOC_ENUM_FMT <vidioc_enum_fmt>` ioctl logic > * for metadata output > + * @vidioc_enum_fmt_audio_cap: pointer to the function that implements > + * :ref:`VIDIOC_ENUM_FMT <vidioc_enum_fmt>` ioctl logic > + * for audio capture > + * @vidioc_enum_fmt_audio_out: pointer to the function that implements > + * :ref:`VIDIOC_ENUM_FMT <vidioc_enum_fmt>` ioctl logic > + * for audio output > * @vidioc_g_fmt_vid_cap: pointer to the function that implements > * :ref:`VIDIOC_G_FMT <vidioc_g_fmt>` ioctl logic for video capture > * in single plane mode > @@ -79,6 +85,10 @@ struct v4l2_fh; > * :ref:`VIDIOC_G_FMT <vidioc_g_fmt>` ioctl logic for metadata capture > * @vidioc_g_fmt_meta_out: pointer to the function that implements > * :ref:`VIDIOC_G_FMT <vidioc_g_fmt>` ioctl logic for metadata output > + * @vidioc_g_fmt_audio_cap: pointer to the function that implements > + * :ref:`VIDIOC_G_FMT <vidioc_g_fmt>` ioctl logic for audio capture > + * @vidioc_g_fmt_audio_out: pointer to the function that implements > + * :ref:`VIDIOC_G_FMT <vidioc_g_fmt>` ioctl logic for audio output > * @vidioc_s_fmt_vid_cap: pointer to the function that implements > * :ref:`VIDIOC_S_FMT <vidioc_g_fmt>` ioctl logic for video capture > * in single plane mode > @@ -113,6 +123,10 @@ struct v4l2_fh; > * :ref:`VIDIOC_S_FMT <vidioc_g_fmt>` ioctl logic for metadata capture > * @vidioc_s_fmt_meta_out: pointer to the function that implements > * :ref:`VIDIOC_S_FMT <vidioc_g_fmt>` ioctl logic for metadata output > + * @vidioc_s_fmt_audio_cap: pointer to the function that implements > + * :ref:`VIDIOC_S_FMT <vidioc_g_fmt>` ioctl logic for audio capture > + * @vidioc_s_fmt_audio_out: pointer to the function that implements > + * :ref:`VIDIOC_S_FMT <vidioc_g_fmt>` ioctl logic for audio output > * @vidioc_try_fmt_vid_cap: pointer to the function that implements > * :ref:`VIDIOC_TRY_FMT <vidioc_g_fmt>` ioctl logic for video capture > * in single plane mode > @@ -149,6 +163,10 @@ struct v4l2_fh; > * :ref:`VIDIOC_TRY_FMT <vidioc_g_fmt>` ioctl logic for metadata capture > * @vidioc_try_fmt_meta_out: pointer to the function that implements > * :ref:`VIDIOC_TRY_FMT <vidioc_g_fmt>` ioctl logic for metadata output > + * @vidioc_try_fmt_audio_cap: pointer to the function that implements > + * :ref:`VIDIOC_TRY_FMT <vidioc_g_fmt>` ioctl logic for audio capture > + * @vidioc_try_fmt_audio_out: pointer to the function that implements > + * :ref:`VIDIOC_TRY_FMT <vidioc_g_fmt>` ioctl logic for audio output > * @vidioc_reqbufs: pointer to the function that implements > * :ref:`VIDIOC_REQBUFS <vidioc_reqbufs>` ioctl > * @vidioc_querybuf: pointer to the function that implements > @@ -315,6 +333,10 @@ struct v4l2_ioctl_ops { > struct v4l2_fmtdesc *f); > int (*vidioc_enum_fmt_meta_out)(struct file *file, void *fh, > struct v4l2_fmtdesc *f); > + int (*vidioc_enum_fmt_audio_cap)(struct file *file, void *fh, > + struct v4l2_fmtdesc *f); > + int (*vidioc_enum_fmt_audio_out)(struct file *file, void *fh, > + struct v4l2_fmtdesc *f); > > /* VIDIOC_G_FMT handlers */ > int (*vidioc_g_fmt_vid_cap)(struct file *file, void *fh, > @@ -345,6 +367,10 @@ struct v4l2_ioctl_ops { > struct v4l2_format *f); > int (*vidioc_g_fmt_meta_out)(struct file *file, void *fh, > struct v4l2_format *f); > + int (*vidioc_g_fmt_audio_cap)(struct file *file, void *fh, > + struct v4l2_format *f); > + int (*vidioc_g_fmt_audio_out)(struct file *file, void *fh, > + struct v4l2_format *f); > > /* VIDIOC_S_FMT handlers */ > int (*vidioc_s_fmt_vid_cap)(struct file *file, void *fh, > @@ -375,6 +401,10 @@ struct v4l2_ioctl_ops { > struct v4l2_format *f); > int (*vidioc_s_fmt_meta_out)(struct file *file, void *fh, > struct v4l2_format *f); > + int (*vidioc_s_fmt_audio_cap)(struct file *file, void *fh, > + struct v4l2_format *f); > + int (*vidioc_s_fmt_audio_out)(struct file *file, void *fh, > + struct v4l2_format *f); > > /* VIDIOC_TRY_FMT handlers */ > int (*vidioc_try_fmt_vid_cap)(struct file *file, void *fh, > @@ -405,6 +435,10 @@ struct v4l2_ioctl_ops { > struct v4l2_format *f); > int (*vidioc_try_fmt_meta_out)(struct file *file, void *fh, > struct v4l2_format *f); > + int (*vidioc_try_fmt_audio_cap)(struct file *file, void *fh, > + struct v4l2_format *f); > + int (*vidioc_try_fmt_audio_out)(struct file *file, void *fh, > + struct v4l2_format *f); > > /* Buffer handlers */ > int (*vidioc_reqbufs)(struct file *file, void *fh, > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h > index 5053f66c501a..1e06ac73b6fa 100644 > --- a/include/uapi/linux/videodev2.h > +++ b/include/uapi/linux/videodev2.h > @@ -153,6 +153,8 @@ enum v4l2_buf_type { > V4L2_BUF_TYPE_SDR_OUTPUT = 12, > V4L2_BUF_TYPE_META_CAPTURE = 13, > V4L2_BUF_TYPE_META_OUTPUT = 14, > + V4L2_BUF_TYPE_AUDIO_CAPTURE = 15, > + V4L2_BUF_TYPE_AUDIO_OUTPUT = 16, > /* Deprecated, do not use */ > V4L2_BUF_TYPE_PRIVATE = 0x80, > }; > @@ -169,6 +171,7 @@ enum v4l2_buf_type { > || (type) == V4L2_BUF_TYPE_VBI_OUTPUT \ > || (type) == V4L2_BUF_TYPE_SLICED_VBI_OUTPUT \ > || (type) == V4L2_BUF_TYPE_SDR_OUTPUT \ > + || (type) == V4L2_BUF_TYPE_AUDIO_OUTPUT \ > || (type) == V4L2_BUF_TYPE_META_OUTPUT) > > #define V4L2_TYPE_IS_CAPTURE(type) (!V4L2_TYPE_IS_OUTPUT(type)) > @@ -2419,6 +2422,18 @@ struct v4l2_meta_format { > __u32 buffersize; > } __attribute__ ((packed)); > > +/** > + * struct v4l2_audio_format - audio data format definition > + * @audioformat: little endian four character code (fourcc) > + * @channels: channel numbers > + * @buffersize: maximum size in bytes required for data > + */ > +struct v4l2_audio_format { > + __u32 audioformat; > + __u32 channels; > + __u32 buffersize; > +} __attribute__ ((packed)); > + > /** > * struct v4l2_format - stream data format > * @type: enum v4l2_buf_type; type of the data stream > @@ -2427,6 +2442,7 @@ struct v4l2_meta_format { > * @win: definition of an overlaid image > * @vbi: raw VBI capture or output parameters > * @sliced: sliced VBI capture or output parameters > + * @audio: definition of an audio format > * @raw_data: placeholder for future extensions and custom formats > * @fmt: union of @pix, @pix_mp, @win, @vbi, @sliced, @sdr, @meta > * and @raw_data > @@ -2441,6 +2457,7 @@ struct v4l2_format { > struct v4l2_sliced_vbi_format sliced; /* V4L2_BUF_TYPE_SLICED_VBI_CAPTURE */ > struct v4l2_sdr_format sdr; /* V4L2_BUF_TYPE_SDR_CAPTURE */ > struct v4l2_meta_format meta; /* V4L2_BUF_TYPE_META_CAPTURE */ > + struct v4l2_audio_format audio; /* V4L2_BUF_TYPE_AUDIO_CAPTURE */ > __u8 raw_data[200]; /* user-defined */ > } fmt; > };
diff --git a/Documentation/userspace-api/media/v4l/buffer.rst b/Documentation/userspace-api/media/v4l/buffer.rst index 52bbee81c080..a3754ca6f0d6 100644 --- a/Documentation/userspace-api/media/v4l/buffer.rst +++ b/Documentation/userspace-api/media/v4l/buffer.rst @@ -438,6 +438,12 @@ enum v4l2_buf_type * - ``V4L2_BUF_TYPE_META_OUTPUT`` - 14 - Buffer for metadata output, see :ref:`metadata`. + * - ``V4L2_BUF_TYPE_AUDIO_CAPTURE`` + - 15 + - Buffer for audio capture, see :ref:`audio`. + * - ``V4L2_BUF_TYPE_AUDIO_OUTPUT`` + - 16 + - Buffer for audio output, see :ref:`audio`. .. _buffer-flags: diff --git a/Documentation/userspace-api/media/v4l/dev-audio-mem2mem.rst b/Documentation/userspace-api/media/v4l/dev-audio-mem2mem.rst new file mode 100644 index 000000000000..68faecfe3a02 --- /dev/null +++ b/Documentation/userspace-api/media/v4l/dev-audio-mem2mem.rst @@ -0,0 +1,71 @@ +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later + +.. _audiomem2mem: + +******************************** +Audio Memory-To-Memory Interface +******************************** + +An audio memory-to-memory device can compress, decompress, transform, or +otherwise convert audio data from one format into another format, in memory. +Such memory-to-memory devices set the ``V4L2_CAP_AUDIO_M2M`` capability. +Examples of memory-to-memory devices are audio codecs, audio preprocessing, +audio postprocessing. + +A memory-to-memory audio node supports both output (sending audio frames from +memory to the hardware) and capture (receiving the processed audio frames +from the hardware into memory) stream I/O. An application will have to +setup the stream I/O for both sides and finally call +:ref:`VIDIOC_STREAMON <VIDIOC_STREAMON>` for both capture and output to +start the hardware. + +Memory-to-memory devices function as a shared resource: you can +open the audio node multiple times, each application setting up their +own properties that are local to the file handle, and each can use +it independently from the others. The driver will arbitrate access to +the hardware and reprogram it whenever another file handler gets access. + +Audio memory-to-memory devices are accessed through character device +special files named ``/dev/v4l-audio`` + +Querying Capabilities +===================== + +Device nodes supporting the audio memory-to-memory interface set the +``V4L2_CAP_AUDIO_M2M`` flag in the ``device_caps`` field of the +:c:type:`v4l2_capability` structure returned by the :c:func:`VIDIOC_QUERYCAP` +ioctl. + +Data Format Negotiation +======================= + +The audio device uses the :ref:`format` ioctls to select the capture format. +The audio buffer content format is bound to that selected format. In addition +to the basic :ref:`format` ioctls, the :c:func:`VIDIOC_ENUM_FMT` ioctl must be +supported as well. + +To use the :ref:`format` ioctls applications set the ``type`` field of the +:c:type:`v4l2_format` structure to ``V4L2_BUF_TYPE_AUDIO_CAPTURE`` or to +``V4L2_BUF_TYPE_AUDIO_OUTPUT``. Both drivers and applications must set the +remainder of the :c:type:`v4l2_format` structure to 0. + +.. c:type:: v4l2_audio_format + +.. tabularcolumns:: |p{1.4cm}|p{2.4cm}|p{13.5cm}| + +.. flat-table:: struct v4l2_audio_format + :header-rows: 0 + :stub-columns: 0 + :widths: 1 1 2 + + * - __u32 + - ``pixelformat`` + - The sample format, set by the application. see :ref:`pixfmt-audio` + * - __u32 + - ``channels`` + - The channel number, set by the application. channel number range is + [1, 32]. + * - __u32 + - ``buffersize`` + - Maximum buffer size in bytes required for data. The value is set by the + driver. diff --git a/Documentation/userspace-api/media/v4l/devices.rst b/Documentation/userspace-api/media/v4l/devices.rst index 8bfbad65a9d4..758bd90f1c26 100644 --- a/Documentation/userspace-api/media/v4l/devices.rst +++ b/Documentation/userspace-api/media/v4l/devices.rst @@ -24,3 +24,4 @@ Interfaces dev-event dev-subdev dev-meta + dev-audio-mem2mem diff --git a/Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst b/Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst index 000c154b0f98..42deb07f4ff4 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst @@ -96,6 +96,8 @@ the ``mbus_code`` field is handled differently: ``V4L2_BUF_TYPE_VIDEO_OVERLAY``, ``V4L2_BUF_TYPE_SDR_CAPTURE``, ``V4L2_BUF_TYPE_SDR_OUTPUT``, + ``V4L2_BUF_TYPE_AUDIO_CAPTURE``, + ``V4L2_BUF_TYPE_AUDIO_OUTPUT``, ``V4L2_BUF_TYPE_META_CAPTURE`` and ``V4L2_BUF_TYPE_META_OUTPUT``. See :c:type:`v4l2_buf_type`. diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-fmt.rst b/Documentation/userspace-api/media/v4l/vidioc-g-fmt.rst index 675c385e5aca..528fd9df41aa 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-g-fmt.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-g-fmt.rst @@ -130,6 +130,10 @@ The format as returned by :ref:`VIDIOC_TRY_FMT <VIDIOC_G_FMT>` must be identical - ``meta`` - Definition of a metadata format, see :ref:`meta-formats`, used by metadata capture devices. + * - struct :c:type:`v4l2_audio_format` + - ``audio`` + - Definition of a audio data format, see :ref:`audiomem2mem`, used by + audio memory-to-memory devices * - __u8 - ``raw_data``\ [200] - Place holder for future extensions. diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions index da6d0b8e4c2c..e61152bb80d1 100644 --- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions +++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions @@ -29,6 +29,8 @@ replace symbol V4L2_FIELD_SEQ_TB :c:type:`v4l2_field` replace symbol V4L2_FIELD_TOP :c:type:`v4l2_field` # Documented enum v4l2_buf_type +replace symbol V4L2_BUF_TYPE_AUDIO_CAPTURE :c:type:`v4l2_buf_type` +replace symbol V4L2_BUF_TYPE_AUDIO_OUTPUT :c:type:`v4l2_buf_type` replace symbol V4L2_BUF_TYPE_META_CAPTURE :c:type:`v4l2_buf_type` replace symbol V4L2_BUF_TYPE_META_OUTPUT :c:type:`v4l2_buf_type` replace symbol V4L2_BUF_TYPE_SDR_CAPTURE :c:type:`v4l2_buf_type` diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c index c7a54d82a55e..12f2be2773a2 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -785,6 +785,10 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) case V4L2_BUF_TYPE_META_OUTPUT: requested_sizes[0] = f->fmt.meta.buffersize; break; + case V4L2_BUF_TYPE_AUDIO_CAPTURE: + case V4L2_BUF_TYPE_AUDIO_OUTPUT: + requested_sizes[0] = f->fmt.audio.buffersize; + break; default: return -EINVAL; } diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c index f81279492682..b92c760b611a 100644 --- a/drivers/media/v4l2-core/v4l2-dev.c +++ b/drivers/media/v4l2-core/v4l2-dev.c @@ -553,6 +553,7 @@ static void determine_valid_ioctls(struct video_device *vdev) bool is_tch = vdev->vfl_type == VFL_TYPE_TOUCH; bool is_meta = vdev->vfl_type == VFL_TYPE_VIDEO && (vdev->device_caps & meta_caps); + bool is_audio = vdev->vfl_type == VFL_TYPE_AUDIO; bool is_rx = vdev->vfl_dir != VFL_DIR_TX; bool is_tx = vdev->vfl_dir != VFL_DIR_RX; bool is_io_mc = vdev->device_caps & V4L2_CAP_IO_MC; @@ -664,6 +665,19 @@ static void determine_valid_ioctls(struct video_device *vdev) SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_meta_out); SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_meta_out); } + if (is_audio && is_rx) { + /* audio capture specific ioctls */ + SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_audio_cap); + SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_audio_cap); + SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_audio_cap); + SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_audio_cap); + } else if (is_audio && is_tx) { + /* audio output specific ioctls */ + SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_audio_out); + SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_audio_out); + SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_audio_out); + SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_audio_out); + } if (is_vbi) { /* vbi specific ioctls */ if ((is_rx && (ops->vidioc_g_fmt_vbi_cap || @@ -927,6 +941,9 @@ int __video_register_device(struct video_device *vdev, case VFL_TYPE_TOUCH: name_base = "v4l-touch"; break; + case VFL_TYPE_AUDIO: + name_base = "v4l-audio"; + break; default: pr_err("%s called with unknown type: %d\n", __func__, type); diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c index 9b1de54ce379..1bb03794922a 100644 --- a/drivers/media/v4l2-core/v4l2-ioctl.c +++ b/drivers/media/v4l2-core/v4l2-ioctl.c @@ -188,6 +188,8 @@ const char *v4l2_type_names[] = { [V4L2_BUF_TYPE_SDR_OUTPUT] = "sdr-out", [V4L2_BUF_TYPE_META_CAPTURE] = "meta-cap", [V4L2_BUF_TYPE_META_OUTPUT] = "meta-out", + [V4L2_BUF_TYPE_AUDIO_CAPTURE] = "audio-cap", + [V4L2_BUF_TYPE_AUDIO_OUTPUT] = "audio-out", }; EXPORT_SYMBOL(v4l2_type_names); @@ -276,6 +278,7 @@ static void v4l_print_format(const void *arg, bool write_only) const struct v4l2_sliced_vbi_format *sliced; const struct v4l2_window *win; const struct v4l2_meta_format *meta; + const struct v4l2_audio_format *audio; u32 pixelformat; u32 planes; unsigned i; @@ -346,6 +349,13 @@ static void v4l_print_format(const void *arg, bool write_only) pr_cont(", dataformat=%p4cc, buffersize=%u\n", &pixelformat, meta->buffersize); break; + case V4L2_BUF_TYPE_AUDIO_CAPTURE: + case V4L2_BUF_TYPE_AUDIO_OUTPUT: + audio = &p->fmt.audio; + pixelformat = audio->audioformat; + pr_cont(", format=%p4cc, channels=%u, buffersize=%u\n", + &pixelformat, audio->channels, audio->buffersize); + break; } } @@ -927,6 +937,7 @@ static int check_fmt(struct file *file, enum v4l2_buf_type type) bool is_tch = vfd->vfl_type == VFL_TYPE_TOUCH; bool is_meta = vfd->vfl_type == VFL_TYPE_VIDEO && (vfd->device_caps & meta_caps); + bool is_audio = vfd->vfl_type == VFL_TYPE_AUDIO; bool is_rx = vfd->vfl_dir != VFL_DIR_TX; bool is_tx = vfd->vfl_dir != VFL_DIR_RX; @@ -992,6 +1003,14 @@ static int check_fmt(struct file *file, enum v4l2_buf_type type) if (is_meta && is_tx && ops->vidioc_g_fmt_meta_out) return 0; break; + case V4L2_BUF_TYPE_AUDIO_CAPTURE: + if (is_audio && is_rx && ops->vidioc_g_fmt_audio_cap) + return 0; + break; + case V4L2_BUF_TYPE_AUDIO_OUTPUT: + if (is_audio && is_tx && ops->vidioc_g_fmt_audio_out) + return 0; + break; default: break; } @@ -1597,6 +1616,16 @@ static int v4l_enum_fmt(const struct v4l2_ioctl_ops *ops, break; ret = ops->vidioc_enum_fmt_meta_out(file, fh, arg); break; + case V4L2_BUF_TYPE_AUDIO_CAPTURE: + if (unlikely(!ops->vidioc_enum_fmt_audio_cap)) + break; + ret = ops->vidioc_enum_fmt_audio_cap(file, fh, arg); + break; + case V4L2_BUF_TYPE_AUDIO_OUTPUT: + if (unlikely(!ops->vidioc_enum_fmt_audio_out)) + break; + ret = ops->vidioc_enum_fmt_audio_out(file, fh, arg); + break; } if (ret == 0) v4l_fill_fmtdesc(p); @@ -1673,6 +1702,10 @@ static int v4l_g_fmt(const struct v4l2_ioctl_ops *ops, return ops->vidioc_g_fmt_meta_cap(file, fh, arg); case V4L2_BUF_TYPE_META_OUTPUT: return ops->vidioc_g_fmt_meta_out(file, fh, arg); + case V4L2_BUF_TYPE_AUDIO_CAPTURE: + return ops->vidioc_g_fmt_audio_cap(file, fh, arg); + case V4L2_BUF_TYPE_AUDIO_OUTPUT: + return ops->vidioc_g_fmt_audio_out(file, fh, arg); } return -EINVAL; } @@ -1784,6 +1817,16 @@ static int v4l_s_fmt(const struct v4l2_ioctl_ops *ops, break; memset_after(p, 0, fmt.meta); return ops->vidioc_s_fmt_meta_out(file, fh, arg); + case V4L2_BUF_TYPE_AUDIO_CAPTURE: + if (unlikely(!ops->vidioc_s_fmt_audio_cap)) + break; + memset_after(p, 0, fmt.audio); + return ops->vidioc_s_fmt_audio_cap(file, fh, arg); + case V4L2_BUF_TYPE_AUDIO_OUTPUT: + if (unlikely(!ops->vidioc_s_fmt_audio_out)) + break; + memset_after(p, 0, fmt.audio); + return ops->vidioc_s_fmt_audio_out(file, fh, arg); } return -EINVAL; } @@ -1892,6 +1935,16 @@ static int v4l_try_fmt(const struct v4l2_ioctl_ops *ops, break; memset_after(p, 0, fmt.meta); return ops->vidioc_try_fmt_meta_out(file, fh, arg); + case V4L2_BUF_TYPE_AUDIO_CAPTURE: + if (unlikely(!ops->vidioc_try_fmt_audio_cap)) + break; + memset_after(p, 0, fmt.audio); + return ops->vidioc_try_fmt_audio_cap(file, fh, arg); + case V4L2_BUF_TYPE_AUDIO_OUTPUT: + if (unlikely(!ops->vidioc_try_fmt_audio_out)) + break; + memset_after(p, 0, fmt.audio); + return ops->vidioc_try_fmt_audio_out(file, fh, arg); } return -EINVAL; } diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h index d82dfdbf6e58..82b63f82d43f 100644 --- a/include/media/v4l2-dev.h +++ b/include/media/v4l2-dev.h @@ -30,6 +30,7 @@ * @VFL_TYPE_SUBDEV: for V4L2 subdevices * @VFL_TYPE_SDR: for Software Defined Radio tuners * @VFL_TYPE_TOUCH: for touch sensors + * @VFL_TYPE_AUDIO: for audio memory-to-memory devices * @VFL_TYPE_MAX: number of VFL types, must always be last in the enum */ enum vfl_devnode_type { @@ -39,6 +40,7 @@ enum vfl_devnode_type { VFL_TYPE_SUBDEV, VFL_TYPE_SDR, VFL_TYPE_TOUCH, + VFL_TYPE_AUDIO, VFL_TYPE_MAX /* Shall be the last one */ }; diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h index edb733f21604..f840cf740ce1 100644 --- a/include/media/v4l2-ioctl.h +++ b/include/media/v4l2-ioctl.h @@ -45,6 +45,12 @@ struct v4l2_fh; * @vidioc_enum_fmt_meta_out: pointer to the function that implements * :ref:`VIDIOC_ENUM_FMT <vidioc_enum_fmt>` ioctl logic * for metadata output + * @vidioc_enum_fmt_audio_cap: pointer to the function that implements + * :ref:`VIDIOC_ENUM_FMT <vidioc_enum_fmt>` ioctl logic + * for audio capture + * @vidioc_enum_fmt_audio_out: pointer to the function that implements + * :ref:`VIDIOC_ENUM_FMT <vidioc_enum_fmt>` ioctl logic + * for audio output * @vidioc_g_fmt_vid_cap: pointer to the function that implements * :ref:`VIDIOC_G_FMT <vidioc_g_fmt>` ioctl logic for video capture * in single plane mode @@ -79,6 +85,10 @@ struct v4l2_fh; * :ref:`VIDIOC_G_FMT <vidioc_g_fmt>` ioctl logic for metadata capture * @vidioc_g_fmt_meta_out: pointer to the function that implements * :ref:`VIDIOC_G_FMT <vidioc_g_fmt>` ioctl logic for metadata output + * @vidioc_g_fmt_audio_cap: pointer to the function that implements + * :ref:`VIDIOC_G_FMT <vidioc_g_fmt>` ioctl logic for audio capture + * @vidioc_g_fmt_audio_out: pointer to the function that implements + * :ref:`VIDIOC_G_FMT <vidioc_g_fmt>` ioctl logic for audio output * @vidioc_s_fmt_vid_cap: pointer to the function that implements * :ref:`VIDIOC_S_FMT <vidioc_g_fmt>` ioctl logic for video capture * in single plane mode @@ -113,6 +123,10 @@ struct v4l2_fh; * :ref:`VIDIOC_S_FMT <vidioc_g_fmt>` ioctl logic for metadata capture * @vidioc_s_fmt_meta_out: pointer to the function that implements * :ref:`VIDIOC_S_FMT <vidioc_g_fmt>` ioctl logic for metadata output + * @vidioc_s_fmt_audio_cap: pointer to the function that implements + * :ref:`VIDIOC_S_FMT <vidioc_g_fmt>` ioctl logic for audio capture + * @vidioc_s_fmt_audio_out: pointer to the function that implements + * :ref:`VIDIOC_S_FMT <vidioc_g_fmt>` ioctl logic for audio output * @vidioc_try_fmt_vid_cap: pointer to the function that implements * :ref:`VIDIOC_TRY_FMT <vidioc_g_fmt>` ioctl logic for video capture * in single plane mode @@ -149,6 +163,10 @@ struct v4l2_fh; * :ref:`VIDIOC_TRY_FMT <vidioc_g_fmt>` ioctl logic for metadata capture * @vidioc_try_fmt_meta_out: pointer to the function that implements * :ref:`VIDIOC_TRY_FMT <vidioc_g_fmt>` ioctl logic for metadata output + * @vidioc_try_fmt_audio_cap: pointer to the function that implements + * :ref:`VIDIOC_TRY_FMT <vidioc_g_fmt>` ioctl logic for audio capture + * @vidioc_try_fmt_audio_out: pointer to the function that implements + * :ref:`VIDIOC_TRY_FMT <vidioc_g_fmt>` ioctl logic for audio output * @vidioc_reqbufs: pointer to the function that implements * :ref:`VIDIOC_REQBUFS <vidioc_reqbufs>` ioctl * @vidioc_querybuf: pointer to the function that implements @@ -315,6 +333,10 @@ struct v4l2_ioctl_ops { struct v4l2_fmtdesc *f); int (*vidioc_enum_fmt_meta_out)(struct file *file, void *fh, struct v4l2_fmtdesc *f); + int (*vidioc_enum_fmt_audio_cap)(struct file *file, void *fh, + struct v4l2_fmtdesc *f); + int (*vidioc_enum_fmt_audio_out)(struct file *file, void *fh, + struct v4l2_fmtdesc *f); /* VIDIOC_G_FMT handlers */ int (*vidioc_g_fmt_vid_cap)(struct file *file, void *fh, @@ -345,6 +367,10 @@ struct v4l2_ioctl_ops { struct v4l2_format *f); int (*vidioc_g_fmt_meta_out)(struct file *file, void *fh, struct v4l2_format *f); + int (*vidioc_g_fmt_audio_cap)(struct file *file, void *fh, + struct v4l2_format *f); + int (*vidioc_g_fmt_audio_out)(struct file *file, void *fh, + struct v4l2_format *f); /* VIDIOC_S_FMT handlers */ int (*vidioc_s_fmt_vid_cap)(struct file *file, void *fh, @@ -375,6 +401,10 @@ struct v4l2_ioctl_ops { struct v4l2_format *f); int (*vidioc_s_fmt_meta_out)(struct file *file, void *fh, struct v4l2_format *f); + int (*vidioc_s_fmt_audio_cap)(struct file *file, void *fh, + struct v4l2_format *f); + int (*vidioc_s_fmt_audio_out)(struct file *file, void *fh, + struct v4l2_format *f); /* VIDIOC_TRY_FMT handlers */ int (*vidioc_try_fmt_vid_cap)(struct file *file, void *fh, @@ -405,6 +435,10 @@ struct v4l2_ioctl_ops { struct v4l2_format *f); int (*vidioc_try_fmt_meta_out)(struct file *file, void *fh, struct v4l2_format *f); + int (*vidioc_try_fmt_audio_cap)(struct file *file, void *fh, + struct v4l2_format *f); + int (*vidioc_try_fmt_audio_out)(struct file *file, void *fh, + struct v4l2_format *f); /* Buffer handlers */ int (*vidioc_reqbufs)(struct file *file, void *fh, diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h index 5053f66c501a..1e06ac73b6fa 100644 --- a/include/uapi/linux/videodev2.h +++ b/include/uapi/linux/videodev2.h @@ -153,6 +153,8 @@ enum v4l2_buf_type { V4L2_BUF_TYPE_SDR_OUTPUT = 12, V4L2_BUF_TYPE_META_CAPTURE = 13, V4L2_BUF_TYPE_META_OUTPUT = 14, + V4L2_BUF_TYPE_AUDIO_CAPTURE = 15, + V4L2_BUF_TYPE_AUDIO_OUTPUT = 16, /* Deprecated, do not use */ V4L2_BUF_TYPE_PRIVATE = 0x80, }; @@ -169,6 +171,7 @@ enum v4l2_buf_type { || (type) == V4L2_BUF_TYPE_VBI_OUTPUT \ || (type) == V4L2_BUF_TYPE_SLICED_VBI_OUTPUT \ || (type) == V4L2_BUF_TYPE_SDR_OUTPUT \ + || (type) == V4L2_BUF_TYPE_AUDIO_OUTPUT \ || (type) == V4L2_BUF_TYPE_META_OUTPUT) #define V4L2_TYPE_IS_CAPTURE(type) (!V4L2_TYPE_IS_OUTPUT(type)) @@ -2419,6 +2422,18 @@ struct v4l2_meta_format { __u32 buffersize; } __attribute__ ((packed)); +/** + * struct v4l2_audio_format - audio data format definition + * @audioformat: little endian four character code (fourcc) + * @channels: channel numbers + * @buffersize: maximum size in bytes required for data + */ +struct v4l2_audio_format { + __u32 audioformat; + __u32 channels; + __u32 buffersize; +} __attribute__ ((packed)); + /** * struct v4l2_format - stream data format * @type: enum v4l2_buf_type; type of the data stream @@ -2427,6 +2442,7 @@ struct v4l2_meta_format { * @win: definition of an overlaid image * @vbi: raw VBI capture or output parameters * @sliced: sliced VBI capture or output parameters + * @audio: definition of an audio format * @raw_data: placeholder for future extensions and custom formats * @fmt: union of @pix, @pix_mp, @win, @vbi, @sliced, @sdr, @meta * and @raw_data @@ -2441,6 +2457,7 @@ struct v4l2_format { struct v4l2_sliced_vbi_format sliced; /* V4L2_BUF_TYPE_SLICED_VBI_CAPTURE */ struct v4l2_sdr_format sdr; /* V4L2_BUF_TYPE_SDR_CAPTURE */ struct v4l2_meta_format meta; /* V4L2_BUF_TYPE_META_CAPTURE */ + struct v4l2_audio_format audio; /* V4L2_BUF_TYPE_AUDIO_CAPTURE */ __u8 raw_data[200]; /* user-defined */ } fmt; };
Audio signal processing has the requirement for memory to memory similar as Video. This patch is to add this support in v4l2 framework, defined new buffer type V4L2_BUF_TYPE_AUDIO_CAPTURE and V4L2_BUF_TYPE_AUDIO_OUTPUT, defined new format v4l2_audio_format for audio case usage. The created audio device is named "/dev/v4l-audioX". Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com> --- .../userspace-api/media/v4l/buffer.rst | 6 ++ .../media/v4l/dev-audio-mem2mem.rst | 71 +++++++++++++++++++ .../userspace-api/media/v4l/devices.rst | 1 + .../media/v4l/vidioc-enum-fmt.rst | 2 + .../userspace-api/media/v4l/vidioc-g-fmt.rst | 4 ++ .../media/videodev2.h.rst.exceptions | 2 + .../media/common/videobuf2/videobuf2-v4l2.c | 4 ++ 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 +++++++++ include/uapi/linux/videodev2.h | 17 +++++ 12 files changed, 213 insertions(+) create mode 100644 Documentation/userspace-api/media/v4l/dev-audio-mem2mem.rst