aboutsummaryrefslogtreecommitdiffstats
path: root/Documentation/media/uapi/v4l/pixfmt-compressed.rst
blob: 55d8d690f22fa548b2b5b7f6d5600eab94561edd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
.. Permission is granted to copy, distribute and/or modify this
.. document under the terms of the GNU Free Documentation License,
.. Version 1.1 or any later version published by the Free Software
.. Foundation, with no Invariant Sections, no Front-Cover Texts
.. and no Back-Cover Texts. A copy of the license is included at
.. Documentation/media/uapi/fdl-appendix.rst.
..
.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections

******************
Compressed Formats
******************


.. _compressed-formats:

.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|

.. flat-table:: Compressed Image Formats
    :header-rows:  1
    :stub-columns: 0
    :widths:       3 1 4

    * - Identifier
      - Code
      - Details
    * .. _V4L2-PIX-FMT-JPEG:

      - ``V4L2_PIX_FMT_JPEG``
      - 'JPEG'
      - TBD. See also :ref:`VIDIOC_G_JPEGCOMP <VIDIOC_G_JPEGCOMP>`,
	:ref:`VIDIOC_S_JPEGCOMP <VIDIOC_G_JPEGCOMP>`.
    * .. _V4L2-PIX-FMT-MPEG:

      - ``V4L2_PIX_FMT_MPEG``
      - 'MPEG'
      - MPEG multiplexed stream. The actual format is determined by
	extended control ``V4L2_CID_MPEG_STREAM_TYPE``, see
	:ref:`mpeg-control-id`.
    * .. _V4L2-PIX-FMT-H264:

      - ``V4L2_PIX_FMT_H264``
      - 'H264'
      - H264 Access Unit.
	The decoder expects one Access Unit per buffer.
	The encoder generates one Access Unit per buffer.
	If :ref:`VIDIOC_ENUM_FMT` reports ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM``
	then the decoder has no requirements since it can parse all the
	information from the raw bytestream.
    * .. _V4L2-PIX-FMT-H264-NO-SC:

      - ``V4L2_PIX_FMT_H264_NO_SC``
      - 'AVC1'
      - H264 video elementary stream without start codes.
    * .. _V4L2-PIX-FMT-H264-MVC:

      - ``V4L2_PIX_FMT_H264_MVC``
      - 'M264'
      - H264 MVC video elementary stream.
    * .. _V4L2-PIX-FMT-H264-SLICE:

      - ``V4L2_PIX_FMT_H264_SLICE``
      - 'S264'
      - H264 parsed slice data, including slice headers, either with or
	without the start code, as extracted from the H264 bitstream.
	This format is adapted for stateless video decoders that implement an
	H264 pipeline (using the :ref:`mem2mem` and :ref:`media-request-api`).
	This pixelformat has two modifiers that must be set at least once
	through the ``V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE``
        and ``V4L2_CID_MPEG_VIDEO_H264_START_CODE`` controls.
	In addition, metadata associated with the frame to decode are
	required to be passed through the ``V4L2_CID_MPEG_VIDEO_H264_SPS``,
	``V4L2_CID_MPEG_VIDEO_H264_PPS``,
	``V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX``,
	``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS`` and
	``V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS`` controls.  See the
	:ref:`associated Codec Control IDs <v4l2-mpeg-h264>`.  Exactly
	one output and one capture buffer must be provided for use
	with this pixel format. The output buffer must contain the
	appropriate number of macroblocks to decode a full
	corresponding frame to the matching capture buffer.

	The syntax for this format is documented in :ref:`h264`, section
	7.3.2.8 "Slice layer without partitioning RBSP syntax" and the following
	sections.

	.. note::

	   This format is not yet part of the public kernel API and it
	   is expected to change.

    * .. _V4L2-PIX-FMT-H263:

      - ``V4L2_PIX_FMT_H263``
      - 'H263'
      - H263 video elementary stream.
    * .. _V4L2-PIX-FMT-MPEG1:

      - ``V4L2_PIX_FMT_MPEG1``
      - 'MPG1'
      - MPEG1 Picture. Each buffer starts with a Picture header, followed
	by other headers as needed and ending with the Picture data.
	If :ref:`VIDIOC_ENUM_FMT` reports ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM``
	then the decoder has no requirements since it can parse all the
	information from the raw bytestream.
    * .. _V4L2-PIX-FMT-MPEG2:

      - ``V4L2_PIX_FMT_MPEG2``
      - 'MPG2'
      - MPEG2 Picture. Each buffer starts with a Picture header, followed
	by other headers as needed and ending with the Picture data.
	If :ref:`VIDIOC_ENUM_FMT` reports ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM``
	then the decoder has no requirements since it can parse all the
	information from the raw bytestream.
    * .. _V4L2-PIX-FMT-MPEG2-SLICE:

      - ``V4L2_PIX_FMT_MPEG2_SLICE``
      - 'MG2S'
      - MPEG-2 parsed slice data, as extracted from the MPEG-2 bitstream.
	This format is adapted for stateless video decoders that implement a
	MPEG-2 pipeline (using the :ref:`mem2mem` and :ref:`media-request-api`).
	Metadata associated with the frame to decode is required to be passed
	through the ``V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS`` control and
	quantization matrices can optionally be specified through the
	``V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION`` control.
	See the :ref:`associated Codec Control IDs <v4l2-mpeg-mpeg2>`.
	Exactly one output and one capture buffer must be provided for use with
	this pixel format. The output buffer must contain the appropriate number
	of macroblocks to decode a full corresponding frame to the matching
	capture buffer.
    * .. _V4L2-PIX-FMT-MPEG4:

      - ``V4L2_PIX_FMT_MPEG4``
      - 'MPG4'
      - MPEG4 video elementary stream.
    * .. _V4L2-PIX-FMT-XVID:

      - ``V4L2_PIX_FMT_XVID``
      - 'XVID'
      - Xvid video elementary stream.
    * .. _V4L2-PIX-FMT-VC1-ANNEX-G:

      - ``V4L2_PIX_FMT_VC1_ANNEX_G``
      - 'VC1G'
      - VC1, SMPTE 421M Annex G compliant stream.
    * .. _V4L2-PIX-FMT-VC1-ANNEX-L:

      - ``V4L2_PIX_FMT_VC1_ANNEX_L``
      - 'VC1L'
      - VC1, SMPTE 421M Annex L compliant stream.
    * .. _V4L2-PIX-FMT-VP8:

      - ``V4L2_PIX_FMT_VP8``
      - 'VP80'
      - VP8 compressed video frame. The encoder generates one
	compressed frame per buffer, and the decoder requires one
	compressed frame per buffer.
    * .. _V4L2-PIX-FMT-VP8-FRAME:

      - ``V4L2_PIX_FMT_VP8_FRAME``
      - 'VP8F'
      - VP8 parsed frame, as extracted from the container.
	This format is adapted for stateless video decoders that implement a
	VP8 pipeline (using the :ref:`mem2mem` and :ref:`media-request-api`).
	Metadata associated with the frame to decode is required to be passed
	through the ``V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER`` control.
	See the :ref:`associated Codec Control IDs <v4l2-mpeg-vp8>`.
	Exactly one output and one capture buffer must be provided for use with
	this pixel format. The output buffer must contain the appropriate number
	of macroblocks to decode a full corresponding frame to the matching
	capture buffer.

	.. note::

	   This format is not yet part of the public kernel API and it
	   is expected to change.

    * .. _V4L2-PIX-FMT-VP9:

      - ``V4L2_PIX_FMT_VP9``
      - 'VP90'
      - VP9 compressed video frame. The encoder generates one
	compressed frame per buffer, and the decoder requires one
	compressed frame per buffer.
    * .. _V4L2-PIX-FMT-HEVC:

      - ``V4L2_PIX_FMT_HEVC``
      - 'HEVC'
      - HEVC/H.265 Access Unit.
	The decoder expects one Access Unit per buffer.
	The encoder generates one Access Unit per buffer.
	If :ref:`VIDIOC_ENUM_FMT` reports ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM``
	then the decoder has no	requirements since it can parse all the
	information from the raw bytestream.
    * .. _V4L2-PIX-FMT-FWHT:

      - ``V4L2_PIX_FMT_FWHT``
      - 'FWHT'
      - Video elementary stream using a codec based on the Fast Walsh Hadamard
        Transform. This codec is implemented by the vicodec ('Virtual Codec')
	driver. See the codec-fwht.h header for more details.
	:ref:`VIDIOC_ENUM_FMT` reports ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM``
	since the decoder can parse all the information from the raw bytestream.
    * .. _V4L2-PIX-FMT-FWHT-STATELESS:

      - ``V4L2_PIX_FMT_FWHT_STATELESS``
      - 'SFWH'
      - Same format as V4L2_PIX_FMT_FWHT but requires stateless codec implementation.
	See the :ref:`associated Codec Control IDs <v4l2-mpeg-fwht>`.

Privacy Policy