From: Maxime Jourdan <mjourdan@baylibre.com>
To: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Maxime Jourdan <mjourdan@baylibre.com>,
Neil Armstrong <narmstrong@baylibre.com>,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
Kevin Hilman <khilman@baylibre.com>,
linux-kernel@vger.kernel.org,
Hans Verkuil <hans.verkuil@cisco.com>,
linux-amlogic@lists.infradead.org, linux-media@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Jerome Brunet <jbrunet@baylibre.com>
Subject: [PATCH v6 2/4] media: videodev2: add V4L2_FMT_FLAG_FIXED_RESOLUTION
Date: Tue, 14 May 2019 15:56:10 +0200 [thread overview]
Message-ID: <20190514135612.30822-3-mjourdan@baylibre.com> (raw)
In-Reply-To: <20190514135612.30822-1-mjourdan@baylibre.com>
When a v4l2 driver exposes V4L2_EVENT_SOURCE_CHANGE, some (usually
OUTPUT) formats may not be able to trigger this event.
For instance, MPEG2 on Amlogic hardware does not support resolution
switching on the fly, and a decode session must operate at a set
resolution defined before the decoding start.
Add a enum_fmt format flag to tag those specific formats.
Signed-off-by: Maxime Jourdan <mjourdan@baylibre.com>
---
Documentation/media/uapi/v4l/vidioc-enum-fmt.rst | 6 ++++++
include/uapi/linux/videodev2.h | 5 +++--
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst b/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst
index 822d6730e7d2..b11448a1848b 100644
--- a/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst
+++ b/Documentation/media/uapi/v4l/vidioc-enum-fmt.rst
@@ -127,6 +127,12 @@ one until ``EINVAL`` is returned.
- This format is not native to the device but emulated through
software (usually libv4l2), where possible try to use a native
format instead for better performance.
+ * - ``V4L2_FMT_FLAG_FIXED_RESOLUTION``
+ - 0x0004
+ - Dynamic resolution switching is not supported for this format,
+ even if the event ``V4L2_EVENT_SOURCE_CHANGE`` is supported by
+ the device.
+
Return Value
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 1050a75fb7ef..9b0a7f82dd92 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -768,8 +768,9 @@ struct v4l2_fmtdesc {
__u32 reserved[4];
};
-#define V4L2_FMT_FLAG_COMPRESSED 0x0001
-#define V4L2_FMT_FLAG_EMULATED 0x0002
+#define V4L2_FMT_FLAG_COMPRESSED 0x0001
+#define V4L2_FMT_FLAG_EMULATED 0x0002
+#define V4L2_FMT_FLAG_FIXED_RESOLUTION 0x0004
/* Frame Size and frame rate enumeration */
/*
--
2.21.0
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next prev parent reply other threads:[~2019-05-14 13:57 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-14 13:56 [PATCH v6 0/4] Add Amlogic video decoder driver Maxime Jourdan
2019-05-14 13:56 ` [PATCH v6 1/4] dt-bindings: media: add Amlogic Video Decoder Bindings Maxime Jourdan
2019-05-14 18:46 ` Martin Blumenstingl
2019-05-14 13:56 ` Maxime Jourdan [this message]
2019-05-14 13:56 ` [PATCH v6 3/4] media: meson: add v4l2 m2m video decoder driver Maxime Jourdan
2019-05-27 10:04 ` Hans Verkuil
2019-05-27 10:18 ` Neil Armstrong
2019-05-27 10:31 ` Hans Verkuil
2019-05-27 14:44 ` Maxime Jourdan
2019-05-27 14:54 ` Hans Verkuil
2019-05-27 15:41 ` Maxime Jourdan
2019-05-14 13:56 ` [PATCH v6 4/4] MAINTAINERS: Add meson video decoder Maxime Jourdan
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