Re: [PATCH v12 07/15] media: v4l2: Add audio capture and output support

From: Hans Verkuil
Date: Wed Feb 21 2024 - 06:13:27 EST

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On 17/02/2024 10:42, Mauro Carvalho Chehab wrote:
> Em Thu, 18 Jan 2024 20:32:00 +0800
> Shengjiu Wang <shengjiu.wang@xxxxxxx> escreveu:
>
>> 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@xxxxxxx>
>> ---
>> .../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-compat-ioctl32.c | 9 +++
>> 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 +++++
>> 13 files changed, 222 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
>
> Hmm... alsa APi define input/output as:
> enum {
> SNDRV_PCM_STREAM_PLAYBACK = 0,
> SNDRV_PCM_STREAM_CAPTURE,
> SNDRV_PCM_STREAM_LAST = SNDRV_PCM_STREAM_CAPTURE,
> };
>
>
> I would use a namespace as close as possible to the
> ALSA API. Also, we're not talking about V4L2, but, instead
> audio. so, not sure if I like the prefix to start with
> V4L2_. Maybe ALSA_?
>
> So, a better namespace would be:
>
> ${prefix}_BUF_TYPE_PCM_STREAM_PLAYBACK
> and
> ${prefix}_BUF_TYPE_PCM_STREAM_CAPTURE
>
>> + - 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`
>
> pixelformat doesn't make any sense for audio: there are no pixels on a

Ah, that's a doc bug: this field is called audioformat in the struct, not
pixelformat. I missed this one in my review.

Regards,

Hans

> PCM stream. Please use call it, instead: `snd_pcm_format`, making it match
> the values for snd_pcm_format_t.
>
> Yet, I would keep defining it as u32 (or u64?) instead of using a
> typedef int field there (snd_pcm_format_t), as the size of integer
> is different on 32 and 64 bit kernels.
>
>
>> + * - __u32
>> + - ``channels``
>> + - The channel number, set by the application. channel number range is
>> + [1, 32].
>
> Why not start on zero?
>
>> + * - __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 54d572c3b515..16ab204d15b0 100644
>> --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
>> +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
>> @@ -791,6 +791,10 @@ 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-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
>> index 8c07400bd280..5e94db8dfdae 100644
>> --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
>> +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
>> @@ -101,6 +101,7 @@ struct v4l2_format32 {
>> struct v4l2_sliced_vbi_format sliced;
>> struct v4l2_sdr_format sdr;
>> struct v4l2_meta_format meta;
>> + struct v4l2_audio_format audio;
>> __u8 raw_data[200]; /* user-defined */
>> } fmt;
>> };
>> @@ -166,6 +167,10 @@ static int get_v4l2_format32(struct v4l2_format *p64,
>> case V4L2_BUF_TYPE_META_OUTPUT:
>> return copy_from_user(&p64->fmt.meta, &p32->fmt.meta,
>> sizeof(p64->fmt.meta)) ? -EFAULT : 0;
>> + case V4L2_BUF_TYPE_AUDIO_CAPTURE:
>> + case V4L2_BUF_TYPE_AUDIO_OUTPUT:
>> + return copy_from_user(&p64->fmt.audio, &p32->fmt.audio,
>> + sizeof(p64->fmt.audio)) ? -EFAULT : 0;
>> default:
>> return -EINVAL;
>> }
>> @@ -216,6 +221,10 @@ static int put_v4l2_format32(struct v4l2_format *p64,
>> case V4L2_BUF_TYPE_META_OUTPUT:
>> return copy_to_user(&p32->fmt.meta, &p64->fmt.meta,
>> sizeof(p64->fmt.meta)) ? -EFAULT : 0;
>> + case V4L2_BUF_TYPE_AUDIO_CAPTURE:
>> + case V4L2_BUF_TYPE_AUDIO_OUTPUT:
>> + return copy_to_user(&p32->fmt.audio, &p64->fmt.audio,
>> + sizeof(p64->fmt.audio)) ? -EFAULT : 0;
>> default:
>> return -EINVAL;
>> }
>> diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
>> index d13954bd31fd..bac008fcedc6 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;
>> @@ -666,6 +667,19 @@ 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 ||
>> @@ -929,6 +943,9 @@ 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 33076af4dfdb..e7be7c2f302d 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 6cd65969c2b5..57c82eb158f1 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))
>> @@ -2423,6 +2426,18 @@ struct v4l2_meta_format {
>> __u32 buffersize;
>> } __attribute__ ((packed));
>>
>> +/**
>> + * struct v4l2_audio_format - audio data format definition
>> + * @audioformat: little endian four character code (fourcc)
>
> Don't use fourcc here. Instead, use the types defined at snd_pcm_format_t.
>
>> + * @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
>> @@ -2431,6 +2446,7 @@ 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
>> @@ -2445,6 +2461,7 @@ 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;
>> };
>
>
>
> Thanks,
> Mauro

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