1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2 3****************** 4Compressed Formats 5****************** 6 7 8.. _compressed-formats: 9 10.. raw:: latex 11 12 \small 13 14.. tabularcolumns:: |p{5.8cm}|p{1.2cm}|p{10.3cm}| 15 16.. cssclass:: longtable 17 18.. flat-table:: Compressed Image Formats 19 :header-rows: 1 20 :stub-columns: 0 21 :widths: 3 1 4 22 23 * - Identifier 24 - Code 25 - Details 26 * .. _V4L2-PIX-FMT-JPEG: 27 28 - ``V4L2_PIX_FMT_JPEG`` 29 - 'JPEG' 30 - TBD. See also :ref:`VIDIOC_G_JPEGCOMP <VIDIOC_G_JPEGCOMP>`, 31 :ref:`VIDIOC_S_JPEGCOMP <VIDIOC_G_JPEGCOMP>`. 32 * .. _V4L2-PIX-FMT-MPEG: 33 34 - ``V4L2_PIX_FMT_MPEG`` 35 - 'MPEG' 36 - MPEG multiplexed stream. The actual format is determined by 37 extended control ``V4L2_CID_MPEG_STREAM_TYPE``, see 38 :ref:`mpeg-control-id`. 39 * .. _V4L2-PIX-FMT-H264: 40 41 - ``V4L2_PIX_FMT_H264`` 42 - 'H264' 43 - H264 Access Unit. 44 The decoder expects one Access Unit per buffer. 45 The encoder generates one Access Unit per buffer. 46 If :ref:`VIDIOC_ENUM_FMT` reports ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM`` 47 then the decoder has no requirements since it can parse all the 48 information from the raw bytestream. 49 * .. _V4L2-PIX-FMT-H264-NO-SC: 50 51 - ``V4L2_PIX_FMT_H264_NO_SC`` 52 - 'AVC1' 53 - H264 video elementary stream without start codes. 54 * .. _V4L2-PIX-FMT-H264-MVC: 55 56 - ``V4L2_PIX_FMT_H264_MVC`` 57 - 'M264' 58 - H264 MVC video elementary stream. 59 * .. _V4L2-PIX-FMT-H264-SLICE: 60 61 - ``V4L2_PIX_FMT_H264_SLICE`` 62 - 'S264' 63 - H264 parsed slice data, including slice headers, either with or 64 without the start code, as extracted from the H264 bitstream. 65 This format is adapted for stateless video decoders that implement an 66 H264 pipeline with the :ref:`stateless_decoder`. 67 This pixelformat has two modifiers that must be set at least once 68 through the ``V4L2_CID_STATELESS_H264_DECODE_MODE`` 69 and ``V4L2_CID_STATELESS_H264_START_CODE`` controls. 70 In addition, metadata associated with the frame to decode are 71 required to be passed through the ``V4L2_CID_STATELESS_H264_SPS``, 72 ``V4L2_CID_STATELESS_H264_PPS``, 73 ``V4L2_CID_STATELESS_H264_SCALING_MATRIX``, 74 ``V4L2_CID_STATELESS_H264_SLICE_PARAMS`` and 75 ``V4L2_CID_STATELESS_H264_DECODE_PARAMS`` controls. See the 76 :ref:`associated Codec Control IDs <v4l2-codec-stateless-h264>`. 77 Exactly one output and one capture buffer must be provided for use 78 with this pixel format. The output buffer must contain the 79 appropriate number of macroblocks to decode a full 80 corresponding frame to the matching capture buffer. 81 82 The syntax for this format is documented in :ref:`h264`, section 83 7.3.2.8 "Slice layer without partitioning RBSP syntax" and the following 84 sections. 85 86 * .. _V4L2-PIX-FMT-H263: 87 88 - ``V4L2_PIX_FMT_H263`` 89 - 'H263' 90 - H263 video elementary stream. 91 * .. _V4L2-PIX-FMT-MPEG1: 92 93 - ``V4L2_PIX_FMT_MPEG1`` 94 - 'MPG1' 95 - MPEG1 Picture. Each buffer starts with a Picture header, followed 96 by other headers as needed and ending with the Picture data. 97 If :ref:`VIDIOC_ENUM_FMT` reports ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM`` 98 then the decoder has no requirements since it can parse all the 99 information from the raw bytestream. 100 * .. _V4L2-PIX-FMT-MPEG2: 101 102 - ``V4L2_PIX_FMT_MPEG2`` 103 - 'MPG2' 104 - MPEG2 Picture. Each buffer starts with a Picture header, followed 105 by other headers as needed and ending with the Picture data. 106 If :ref:`VIDIOC_ENUM_FMT` reports ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM`` 107 then the decoder has no requirements since it can parse all the 108 information from the raw bytestream. 109 * .. _V4L2-PIX-FMT-MPEG2-SLICE: 110 111 - ``V4L2_PIX_FMT_MPEG2_SLICE`` 112 - 'MG2S' 113 - MPEG-2 parsed slice data, as extracted from the MPEG-2 bitstream. 114 This format is adapted for stateless video decoders that implement a 115 MPEG-2 pipeline (using the :ref:`mem2mem` and :ref:`media-request-api`). 116 Metadata associated with the frame to decode is required to be passed 117 through the ``V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS`` control and 118 quantization matrices can optionally be specified through the 119 ``V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION`` control. 120 See the :ref:`associated Codec Control IDs <v4l2-mpeg-mpeg2>`. 121 Exactly one output and one capture buffer must be provided for use with 122 this pixel format. The output buffer must contain the appropriate number 123 of macroblocks to decode a full corresponding frame to the matching 124 capture buffer. 125 * .. _V4L2-PIX-FMT-MPEG4: 126 127 - ``V4L2_PIX_FMT_MPEG4`` 128 - 'MPG4' 129 - MPEG4 video elementary stream. 130 * .. _V4L2-PIX-FMT-XVID: 131 132 - ``V4L2_PIX_FMT_XVID`` 133 - 'XVID' 134 - Xvid video elementary stream. 135 * .. _V4L2-PIX-FMT-VC1-ANNEX-G: 136 137 - ``V4L2_PIX_FMT_VC1_ANNEX_G`` 138 - 'VC1G' 139 - VC1, SMPTE 421M Annex G compliant stream. 140 * .. _V4L2-PIX-FMT-VC1-ANNEX-L: 141 142 - ``V4L2_PIX_FMT_VC1_ANNEX_L`` 143 - 'VC1L' 144 - VC1, SMPTE 421M Annex L compliant stream. 145 * .. _V4L2-PIX-FMT-VP8: 146 147 - ``V4L2_PIX_FMT_VP8`` 148 - 'VP80' 149 - VP8 compressed video frame. The encoder generates one 150 compressed frame per buffer, and the decoder requires one 151 compressed frame per buffer. 152 * .. _V4L2-PIX-FMT-VP8-FRAME: 153 154 - ``V4L2_PIX_FMT_VP8_FRAME`` 155 - 'VP8F' 156 - VP8 parsed frame, as extracted from the container. 157 This format is adapted for stateless video decoders that implement a 158 VP8 pipeline (using the :ref:`mem2mem` and :ref:`media-request-api`). 159 Metadata associated with the frame to decode is required to be passed 160 through the ``V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER`` control. 161 See the :ref:`associated Codec Control IDs <v4l2-mpeg-vp8>`. 162 Exactly one output and one capture buffer must be provided for use with 163 this pixel format. The output buffer must contain the appropriate number 164 of macroblocks to decode a full corresponding frame to the matching 165 capture buffer. 166 167 .. note:: 168 169 This format is not yet part of the public kernel API and it 170 is expected to change. 171 172 * .. _V4L2-PIX-FMT-VP9: 173 174 - ``V4L2_PIX_FMT_VP9`` 175 - 'VP90' 176 - VP9 compressed video frame. The encoder generates one 177 compressed frame per buffer, and the decoder requires one 178 compressed frame per buffer. 179 * .. _V4L2-PIX-FMT-HEVC: 180 181 - ``V4L2_PIX_FMT_HEVC`` 182 - 'HEVC' 183 - HEVC/H.265 Access Unit. 184 The decoder expects one Access Unit per buffer. 185 The encoder generates one Access Unit per buffer. 186 If :ref:`VIDIOC_ENUM_FMT` reports ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM`` 187 then the decoder has no requirements since it can parse all the 188 information from the raw bytestream. 189 * .. _V4L2-PIX-FMT-HEVC-SLICE: 190 191 - ``V4L2_PIX_FMT_HEVC_SLICE`` 192 - 'S265' 193 - HEVC parsed slice data, as extracted from the HEVC bitstream. 194 This format is adapted for stateless video decoders that implement a 195 HEVC pipeline (using the :ref:`mem2mem` and :ref:`media-request-api`). 196 This pixelformat has two modifiers that must be set at least once 197 through the ``V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE`` 198 and ``V4L2_CID_MPEG_VIDEO_HEVC_START_CODE`` controls. 199 Metadata associated with the frame to decode is required to be passed 200 through the following controls: 201 ``V4L2_CID_MPEG_VIDEO_HEVC_SPS``, 202 ``V4L2_CID_MPEG_VIDEO_HEVC_PPS``, and 203 ``V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS``. 204 See the :ref:`associated Codec Control IDs <v4l2-mpeg-hevc>`. 205 Buffers associated with this pixel format must contain the appropriate 206 number of macroblocks to decode a full corresponding frame. 207 208 .. note:: 209 210 This format is not yet part of the public kernel API and it 211 is expected to change. 212 * .. _V4L2-PIX-FMT-FWHT: 213 214 - ``V4L2_PIX_FMT_FWHT`` 215 - 'FWHT' 216 - Video elementary stream using a codec based on the Fast Walsh Hadamard 217 Transform. This codec is implemented by the vicodec ('Virtual Codec') 218 driver. See the codec-fwht.h header for more details. 219 :ref:`VIDIOC_ENUM_FMT` reports ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM`` 220 since the decoder can parse all the information from the raw bytestream. 221 * .. _V4L2-PIX-FMT-FWHT-STATELESS: 222 223 - ``V4L2_PIX_FMT_FWHT_STATELESS`` 224 - 'SFWH' 225 - Same format as V4L2_PIX_FMT_FWHT but requires stateless codec implementation. 226 Metadata associated with the frame to decode is required to be passed 227 through the ``V4L2_CID_STATELESS_FWHT_PARAMS`` control. 228 See the :ref:`associated Codec Control ID <codec-stateless-fwht>`. 229 230.. raw:: latex 231 232 \normalsize 233