[PATCH v5 04/11] media: uapi: h264: Add the concept of start code

Ezequiel Garcia
2019-08-12T19:35:59Z

Stateless decoders have different expectations about the
start code that is prepended on H264 slices. Add a
menu control to express the supported start code types
(including no start code).

Drivers are allowed to support only one start code type,
but they can support both too.

Note that this is independent of the H264 decoding mode,
which specifies the granularity of the decoding operations.
Either in frame-based or slice-based mode, this new control
will allow to define the start code expected on H264 slices.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
---
Changes in v5:
* Improve specification as suggested by Hans.
Changes in v4:
* New patch.
---
.../media/uapi/v4l/ext-ctrls-codec.rst | 33 +++++++++++++++++++
.../media/uapi/v4l/pixfmt-compressed.rst | 3 +-
drivers/media/v4l2-core/v4l2-ctrls.c | 9 +++++
include/media/h264-ctrls.h | 6 ++++
4 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst
index 568390273fde..ec0078e299a5 100644
--- a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst
+++ b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst
@@ -2066,6 +2066,39 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
The OUTPUT buffer must contain all slices needed to decode the
frame. The OUTPUT buffer must also contain both fields.

+``V4L2_CID_MPEG_VIDEO_H264_STARTCODE (enum)``
+ Specifies the H264 slice start code expected for each slice.
+ This control is used to complement V4L2_PIX_FMT_H264_SLICE
+ pixel format. Applications that support V4L2_PIX_FMT_H264_SLICE
+ are required to set this control in order to specify the start code
+ that is expected for the buffer.
+ Drivers may expose a single or multiple start codes, depending
+ on what they can support.
+
+ .. note::
+
+ This menu control is not yet part of the public kernel API and
+ it is expected to change.
+
+.. c:type:: v4l2_mpeg_video_h264_startcode
+
+.. cssclass:: longtable
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - ``V4L2_MPEG_VIDEO_H264_NO_STARTCODE``
+ - 0
+ - Selecting this value specifies that H264 slices are passed
+ to the driver without any start code.
+ * - ``V4L2_MPEG_VIDEO_H264_ANNEX_B_STARTCODE``
+ - 1
+ - Selecting this value specifies that H264 slices are expected
+ to be prefixed by Annex B start codes. According to :ref:`h264`
+ valid start codes can be 3-bytes 0x000001, or 4-bytes 0x00000001.
+
.. _v4l2-mpeg-mpeg2:

``V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS (struct)``
diff --git a/Documentation/media/uapi/v4l/pixfmt-compressed.rst b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
index 50557c85d99d..5030d326f0db 100644
--- a/Documentation/media/uapi/v4l/pixfmt-compressed.rst
+++ b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
@@ -61,7 +61,8 @@ Compressed Formats
stateless video decoders that implement an H264 pipeline
(using the :ref:`mem2mem` and :ref:`media-request-api`).
Metadata associated with the frame to decode are required to
- be passed through the ``V4L2_CID_MPEG_VIDEO_H264_DECODING_MODE``,
+ be passed through the ``V4L2_CID_MPEG_VIDEO_H264_STARTCODE``,
+ ``V4L2_CID_MPEG_VIDEO_H264_DECODING_MODE``,
``V4L2_CID_MPEG_VIDEO_H264_SPS``,
``V4L2_CID_MPEG_VIDEO_H264_PPS``,
``V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX``,
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index c3194299bfac..01fddb4ec640 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -407,6 +407,11 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
"Frame-Based",
NULL,
};
+ static const char * const h264_start_code[] = {
+ "No Start Code",
+ "Annex B Start Code",
+ NULL,
+ };
static const char * const mpeg_mpeg2_level[] = {
"Low",
"Main",
@@ -640,6 +645,8 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
return h264_fmo_map_type;
case V4L2_CID_MPEG_VIDEO_H264_DECODING_MODE:
return h264_decoding_mode;
+ case V4L2_CID_MPEG_VIDEO_H264_STARTCODE:
+ return h264_start_code;
case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL:
return mpeg_mpeg2_level;
case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE:
@@ -860,6 +867,7 @@ const char *v4l2_ctrl_get_name(u32 id)
case V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS: return "H264 Slice Parameters";
case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS: return "H264 Decode Parameters";
case V4L2_CID_MPEG_VIDEO_H264_DECODING_MODE: return "H264 Decoding Mode";
+ case V4L2_CID_MPEG_VIDEO_H264_STARTCODE: return "H264 Start Code";
case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL: return "MPEG2 Level";
case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE: return "MPEG2 Profile";
case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
@@ -1229,6 +1237,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE:
case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE:
case V4L2_CID_MPEG_VIDEO_H264_DECODING_MODE:
+ case V4L2_CID_MPEG_VIDEO_H264_STARTCODE:
case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL:
case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE:
case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL:
diff --git a/include/media/h264-ctrls.h b/include/media/h264-ctrls.h
index e6c510877f67..31555c99f64a 100644
--- a/include/media/h264-ctrls.h
+++ b/include/media/h264-ctrls.h
@@ -27,6 +27,7 @@
#define V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS (V4L2_CID_MPEG_BASE+1003)
#define V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS (V4L2_CID_MPEG_BASE+1004)
#define V4L2_CID_MPEG_VIDEO_H264_DECODING_MODE (V4L2_CID_MPEG_BASE+1005)
+#define V4L2_CID_MPEG_VIDEO_H264_STARTCODE (V4L2_CID_MPEG_BASE+1006)

/* enum v4l2_ctrl_type type values */
#define V4L2_CTRL_TYPE_H264_SPS 0x0110
@@ -41,6 +42,11 @@ enum v4l2_mpeg_video_h264_decoding_mode {
V4L2_MPEG_VIDEO_H264_FRAME_BASED_DECODING,
};

+enum v4l2_mpeg_video_h264_start_code {
+ V4L2_MPEG_VIDEO_H264_NO_STARTCODE,
+ V4L2_MPEG_VIDEO_H264_ANNEX_B_STARTCODE,
+};
+
#define V4L2_H264_SPS_CONSTRAINT_SET0_FLAG 0x01
#define V4L2_H264_SPS_CONSTRAINT_SET1_FLAG 0x02
#define V4L2_H264_SPS_CONSTRAINT_SET2_FLAG 0x04
--
2.22.0