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/Linux-v5.15/Documentation/userspace-api/media/v4l/
Dyuv-formats.rst26 differences, is called chroma subsampling.
28 While many combinations of subsampling factors in the horizontal and vertical
29 direction are possible, common factors are 1 (no subsampling), 2 and 4, with
30 horizontal subsampling always larger than or equal to vertical subsampling.
33 - `4:4:4`: No subsampling
34 - `4:2:2`: Horizontal subsampling by 2, no vertical subsampling
35 - `4:2:0`: Horizontal subsampling by 2, vertical subsampling by 2
36 - `4:1:1`: Horizontal subsampling by 4, no vertical subsampling
37 - `4:1:0`: Horizontal subsampling by 4, vertical subsampling by 4
59 .. flat-table:: 4:2:2 subsampling, interstitially sited
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Dext-ctrls-jpeg.rst26 The chroma subsampling factors describe how each component of an
40 - No chroma subsampling, each pixel has Y, Cr and Cb values.
Dpixfmt-m420.rst16 M420 is a YUV format with ½ horizontal and vertical chroma subsampling
Dpixfmt-yuv-planar.rst42 subsampling, the chroma line stride (in bytes) is thus equal to twice the luma
43 line stride. With horizontal subsampling by 2, the chroma line stride is equal
44 to the luma line stride. Vertical subsampling doesn't affect the line stride.
479 formats. The two chroma planes always use the same subsampling.
484 horizontal subsampling factor. Vertical subsampling doesn't affect the line
Dpixfmt-packed-yuv.rst10 Cr components consecutively in memory. They may apply subsampling to the chroma
Dpixfmt-reserved.rst262 subsampling).
/Linux-v5.15/drivers/media/platform/s5p-jpeg/
Djpeg-core.c56 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_422,
68 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_422,
80 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_422,
92 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_422,
104 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_422,
116 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_422,
128 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_422,
140 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_444,
152 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_444,
164 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_444,
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Djpeg-core.h169 int subsampling; member
231 unsigned short subsampling; member
/Linux-v5.15/drivers/media/platform/
Drcar_jpu.c229 unsigned char subsampling; member
249 u8 subsampling; member
1084 u8 subsampling = jpu_parse_hdr(buffer, buf_size, &width, in jpu_buf_queue() local
1088 if (subsampling != JPU_JPEG_422 && subsampling != JPU_JPEG_420) in jpu_buf_queue()
1108 jpu_buf->subsampling = subsampling; in jpu_buf_queue()
1144 *(buffer + JPU_JPEG_SUBS_OFFSET) = q_data->fmtinfo->subsampling; in jpu_buf_finish()
1355 unsigned char num_planes, subsampling; in jpu_device_run() local
1383 subsampling = q_data->fmtinfo->subsampling; in jpu_device_run()
1400 if (subsampling == JPU_JPEG_420) { in jpu_device_run()
1447 if (jpu_buf->subsampling != subsampling) { in jpu_device_run()
/Linux-v5.15/include/media/
Dv4l2-jpeg.h62 enum v4l2_jpeg_chroma_subsampling subsampling; member
/Linux-v5.15/drivers/media/platform/imx-jpeg/
Dmxc-jpeg.h56 enum v4l2_jpeg_chroma_subsampling subsampling; member
Dmxc-jpeg.c69 .subsampling = -1,
77 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_444,
88 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_444,
99 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_420,
110 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_422,
121 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_444,
132 .subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY,
1123 if (mxc_formats[i].subsampling == header->frame.subsampling && in mxc_jpeg_get_image_format()
1131 header->frame.subsampling); in mxc_jpeg_get_image_format()
/Linux-v5.15/drivers/media/platform/coda/
Dcoda-jpeg.c395 switch (header.frame.subsampling) { in coda_jpeg_decode_header()
398 ctx->params.jpeg_chroma_subsampling = header.frame.subsampling; in coda_jpeg_decode_header()
402 header.frame.subsampling); in coda_jpeg_decode_header()
955 static unsigned char subsampling[5][3] = { in coda9_jpeg_encode_header() local
967 ret = coda_jpeg_put_byte(subsampling[chroma_format][i], in coda9_jpeg_encode_header()
/Linux-v5.15/drivers/media/v4l2-core/
Dv4l2-jpeg.c227 frame_header->subsampling = subs; in jpeg_parse_frame_header()