From patchwork Thu Jun 29 01:37:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shengjiu Wang X-Patchwork-Id: 698458 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EE803EB64DA for ; Thu, 29 Jun 2023 02:13:18 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id EAC7D845; Thu, 29 Jun 2023 04:12:26 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz EAC7D845 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1688004797; bh=9t39Stbztx/Jg6TSs9oOaXriOTytjZW97BIqdrvg7DQ=; h=From:To:Subject:Date:In-Reply-To:References:List-Id:List-Archive: List-Help:List-Owner:List-Post:List-Subscribe:List-Unsubscribe: From; b=HFHzCFEKB2xNgVbquxgb9IFTFrIPZLr+UI7/1dwFDpwhiJ8pIQh6fj/b4KifEg99M kvJZq13vZZ7YhB+UspNkbB78eK94IBDyCO3IBbz6ixfd5zeAlAciFkHrDdEq4AWtCq nd1agDGpxmeZ2H0d9nI7YRU5dFmu1BFyUZ+rgvOs= Received: by alsa1.perex.cz (Postfix, from userid 50401) id 5E57BF805A9; Thu, 29 Jun 2023 04:11:25 +0200 (CEST) Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id DE218F8027B; Thu, 29 Jun 2023 04:11:24 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id A6044F8057D; Thu, 29 Jun 2023 04:11:19 +0200 (CEST) Received: from inva020.nxp.com (inva020.nxp.com [92.121.34.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 952EEF800E3 for ; Thu, 29 Jun 2023 04:10:34 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 952EEF800E3 Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id E336E1A0D8C; Thu, 29 Jun 2023 04:10:33 +0200 (CEST) Received: from aprdc01srsp001v.ap-rdc01.nxp.com (aprdc01srsp001v.ap-rdc01.nxp.com [165.114.16.16]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 80C6F1A0D70; Thu, 29 Jun 2023 04:10:33 +0200 (CEST) Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by aprdc01srsp001v.ap-rdc01.nxp.com (Postfix) with ESMTP id BFBB2181D0E3; Thu, 29 Jun 2023 10:10:31 +0800 (+08) From: Shengjiu Wang To: tfiga@chromium.org, m.szyprowski@samsung.com, mchehab@kernel.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, shengjiu.wang@gmail.com, Xiubo.Lee@gmail.com, festevam@gmail.com, nicoleotsuka@gmail.com, lgirdwood@gmail.com, broonie@kernel.org, perex@perex.cz, tiwai@suse.com, alsa-devel@alsa-project.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH 1/6] media: v4l2: Add audio capture and output support Date: Thu, 29 Jun 2023 09:37:48 +0800 Message-Id: <1688002673-28493-2-git-send-email-shengjiu.wang@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1688002673-28493-1-git-send-email-shengjiu.wang@nxp.com> References: <1688002673-28493-1-git-send-email-shengjiu.wang@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP Message-ID-Hash: 2YUKN7UL4BEKLRCV5PG4K7OEN4ZCG3QD X-Message-ID-Hash: 2YUKN7UL4BEKLRCV5PG4K7OEN4ZCG3QD X-MailFrom: shengjiu.wang@nxp.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: 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/audioX". Signed-off-by: Shengjiu Wang --- .../media/common/videobuf2/videobuf2-v4l2.c | 4 ++ drivers/media/v4l2-core/v4l2-dev.c | 17 ++++++ drivers/media/v4l2-core/v4l2-ioctl.c | 52 +++++++++++++++++++ include/media/v4l2-dev.h | 2 + include/media/v4l2-ioctl.h | 34 ++++++++++++ include/uapi/linux/videodev2.h | 19 +++++++ 6 files changed, 128 insertions(+) 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..67484f4c6eaf 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 = "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 a858acea6547..26bc4b0d8ef0 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 +349,12 @@ 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; + pr_cont(", rate=%u, format=%u, channels=%u, buffersize=%u\n", + audio->rate, audio->format, audio->channels, audio->buffersize); + break; } } @@ -927,6 +936,7 @@ 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 +1002,14 @@ 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; } @@ -1592,6 +1610,16 @@ 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); @@ -1668,6 +1696,10 @@ 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; } @@ -1779,6 +1811,16 @@ 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; } @@ -1887,6 +1929,16 @@ 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 e0a13505f88d..0924e6d1dab1 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 input/output 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 ` ioctl logic * for metadata output + * @vidioc_enum_fmt_audio_cap: pointer to the function that implements + * :ref:`VIDIOC_ENUM_FMT ` ioctl logic + * for audio capture + * @vidioc_enum_fmt_audio_out: pointer to the function that implements + * :ref:`VIDIOC_ENUM_FMT ` ioctl logic + * for audio output * @vidioc_g_fmt_vid_cap: pointer to the function that implements * :ref:`VIDIOC_G_FMT ` ioctl logic for video capture * in single plane mode @@ -79,6 +85,10 @@ struct v4l2_fh; * :ref:`VIDIOC_G_FMT ` ioctl logic for metadata capture * @vidioc_g_fmt_meta_out: pointer to the function that implements * :ref:`VIDIOC_G_FMT ` ioctl logic for metadata output + * @vidioc_g_fmt_audio_cap: pointer to the function that implements + * :ref:`VIDIOC_G_FMT ` ioctl logic for audio capture + * @vidioc_g_fmt_audio_out: pointer to the function that implements + * :ref:`VIDIOC_G_FMT ` ioctl logic for audio output * @vidioc_s_fmt_vid_cap: pointer to the function that implements * :ref:`VIDIOC_S_FMT ` ioctl logic for video capture * in single plane mode @@ -113,6 +123,10 @@ struct v4l2_fh; * :ref:`VIDIOC_S_FMT ` ioctl logic for metadata capture * @vidioc_s_fmt_meta_out: pointer to the function that implements * :ref:`VIDIOC_S_FMT ` ioctl logic for metadata output + * @vidioc_s_fmt_audio_cap: pointer to the function that implements + * :ref:`VIDIOC_S_FMT ` ioctl logic for audio capture + * @vidioc_s_fmt_audio_out: pointer to the function that implements + * :ref:`VIDIOC_S_FMT ` ioctl logic for audio output * @vidioc_try_fmt_vid_cap: pointer to the function that implements * :ref:`VIDIOC_TRY_FMT ` ioctl logic for video capture * in single plane mode @@ -149,6 +163,10 @@ struct v4l2_fh; * :ref:`VIDIOC_TRY_FMT ` ioctl logic for metadata capture * @vidioc_try_fmt_meta_out: pointer to the function that implements * :ref:`VIDIOC_TRY_FMT ` ioctl logic for metadata output + * @vidioc_try_fmt_audio_cap: pointer to the function that implements + * :ref:`VIDIOC_TRY_FMT ` ioctl logic for audio capture + * @vidioc_try_fmt_audio_out: pointer to the function that implements + * :ref:`VIDIOC_TRY_FMT ` ioctl logic for audio output * @vidioc_reqbufs: pointer to the function that implements * :ref:`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 aee75eb9e686..a7af28f4c8c3 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)) @@ -2404,6 +2407,20 @@ struct v4l2_meta_format { __u32 buffersize; } __attribute__ ((packed)); +/** + * struct v4l2_audio_format - audio data format definition + * @rate: sample rate + * @format: sample format + * @channels: channel numbers + * @buffersize: maximum size in bytes required for data + */ +struct v4l2_audio_format { + __u32 rate; + __u32 format; + __u32 channels; + __u32 buffersize; +} __attribute__ ((packed)); + /** * struct v4l2_format - stream data format * @type: enum v4l2_buf_type; type of the data stream @@ -2412,6 +2429,7 @@ 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 @@ -2426,6 +2444,7 @@ 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; };