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
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 d5da76607101..cf86a06bac25 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; };