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/linux-6.15/Documentation/userspace-api/media/v4l/
H A Dyuv-formats.rst23 YUV formats commonly encode images with a lower resolution for the chroma
26 differences, is called chroma subsampling.
39 Subsampling the chroma component effectively creates chroma values that can be
42 - .. _yuv-chroma-centered:
44 The subsampled chroma value may be calculated by simply averaging the chroma
47 interstitially sited chroma.
49 - .. _yuv-chroma-cosited:
51 The other option is to subsample chroma values in a way that place them in
53 other chroma sample (creating aliasing artifacts), or with filters using an
54 odd number of taps. This is referred to as co-sited chroma.
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H A Dpixfmt-m420.rst9 Format with ½ horizontal and vertical chroma resolution, also known as
16 M420 is a YUV format with ½ horizontal and vertical chroma subsampling
17 (YUV 4:2:0). Pixels are organized as interleaved luma and chroma planes.
18 Two lines of luma data are followed by one line of chroma data.
20 The luma plane has one byte per pixel. The chroma plane contains
70 Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>`
H A Dpixfmt-yuv-planar.rst9 Planar formats split luma and chroma data in separate memory regions. They
37 chroma plane, with Cb and Cr always stored in pairs. The chroma order is
47 relationship between the luma and chroma line padding and stride.
208 .. [1] Order of chroma samples in the second plane
215 Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>`
326 The layouts of the luma and chroma planes are identical.
371 The layouts of the luma and chroma planes are identical.
401 The layouts of the luma and chroma planes are identical.
836 formats. The two chroma planes always use the same subsampling.
839 chroma lines is identical to the padding of the luma lines. The chroma line
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H A Dpixfmt-packed-yuv.rst10 Cr components consecutively in memory. They may apply subsampling to the chroma
16 - 'Y', 'Cb' and 'Cr' denote bits of the luma, blue chroma (also known as
17 'U') and red chroma (also known as 'V') components respectively. 'A'
25 These formats do not subsample the chroma components and store each pixels as a
292 These formats, commonly referred to as YUYV or YUY2, subsample the chroma
418 Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>`
425 This format subsamples the chroma components horizontally by 4, storing 8
481 Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>`
H A Dvidioc-g-fbuf.rst140 formats (only packed YUV formats when chroma keying is used, not
213 - The device supports clipping by chroma-keying the images. That is,
242 chroma-key colors are replaced by framebuffer pixels, which is
279 - Use chroma-keying. The chroma-key color is determined by the
311 - Use source chroma-keying. The source chroma-key color is
315 and :ref:`osd`. Both chroma-keying are mutual exclusive to each
H A 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.
H A Ddev-overlay.rst181 When chroma-keying has been negotiated with
183 to the desired pixel value for the chroma key. The format is the
192 When chroma-keying has *not* been negotiated and
217 When chroma-keying has *not* been negotiated and
239 both, or despite negotiating chroma-keying, the results are undefined.
H A Dcontrol.rst75 Picture color saturation or chroma gain.
118 Red chroma balance.
121 Blue chroma balance.
193 Adjusts the Chroma gain control (for use when chroma AGC is
247 - The Cb and Cr chroma components are replaced by fixed coefficients
H A Dext-ctrls-codec-stateless.rst895 else the chroma plane is half the height of the luma plane.
899 else the chroma plane is half the width of the luma plane.
1456 zigzag scanning order. It is relevant for both luma and chroma
2140 the chroma components.
2156 - Specifies the chroma sampling.
2762 all chroma weighting factors.
3093 - Specify the chroma subsampling format.
3096 - Specify the chroma subsampling format.
3608 chroma U plane decoding.
3612 chroma V plane decoding.
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H A Dcolorspaces.rst109 prefer to use luma (Y') and chroma (CbCr) instead of R'G'B'. Since the
117 correct, it is just an encoding of an R'G'B' color into luma and chroma
/linux-6.15/drivers/gpu/drm/msm/disp/
H A Dmdp_format.c110 alpha, chroma, count, bp, flg, fm, np) \ argument
120 .chroma_sample = chroma, \
129 #define PSEUDO_YUV_FMT(fmt, a, r, g, b, e0, e1, chroma, flg, fm, np) \ argument
139 .chroma_sample = chroma, \
148 #define PSEUDO_YUV_FMT_TILED(fmt, a, r, g, b, e0, e1, chroma, \ argument
159 .chroma_sample = chroma, \
168 #define PSEUDO_YUV_FMT_LOOSE(fmt, a, r, g, b, e0, e1, chroma, flg, fm, np)\ argument
178 .chroma_sample = chroma, \
187 #define PSEUDO_YUV_FMT_LOOSE_TILED(fmt, a, r, g, b, e0, e1, chroma, \ argument
198 .chroma_sample = chroma, \
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/linux-6.15/drivers/video/fbdev/core/
H A Dfbmon.c335 specs->chroma.redx = tmp/1024; in get_chroma()
341 specs->chroma.redy = tmp/1024; in get_chroma()
342 DPRINTK("RedY: 0.%03d\n", specs->chroma.redy); in get_chroma()
347 specs->chroma.greenx = tmp/1024; in get_chroma()
353 specs->chroma.greeny = tmp/1024; in get_chroma()
354 DPRINTK("GreenY: 0.%03d\n", specs->chroma.greeny); in get_chroma()
359 specs->chroma.bluex = tmp/1024; in get_chroma()
365 specs->chroma.bluey = tmp/1024; in get_chroma()
366 DPRINTK("BlueY: 0.%03d\n", specs->chroma.bluey); in get_chroma()
371 specs->chroma.whitex = tmp/1024; in get_chroma()
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/linux-6.15/drivers/media/pci/bt8xx/
H A Dbttv-risc.c122 unsigned int instructions,line,todo,ylen,chroma; in bttv_risc_planar() local
155 chroma = 1; in bttv_risc_planar()
159 chroma = ((line & 1) == 0); in bttv_risc_planar()
161 chroma = ((line & 1) == 1); in bttv_risc_planar()
165 chroma = ((line & 3) == 0); in bttv_risc_planar()
167 chroma = ((line & 3) == 2); in bttv_risc_planar()
170 chroma = 0; in bttv_risc_planar()
185 if (chroma) { in bttv_risc_planar()
214 if (chroma) { in bttv_risc_planar()
222 if (chroma) { in bttv_risc_planar()
/linux-6.15/drivers/media/platform/qcom/iris/
H A Diris_platform_common.h18 #define REGISTER_BIT_DEPTH(luma, chroma) ((luma) << 16 | (chroma)) argument
/linux-6.15/drivers/media/pci/cx18/
H A Dcx18-av-core.c618 int chroma = vid_input & 0xf00; in set_input() local
623 chroma < CX18_AV_SVIDEO_CHROMA4 || in set_input()
624 chroma > CX18_AV_SVIDEO_CHROMA8) { in set_input()
631 if (chroma >= CX18_AV_SVIDEO_CHROMA7) { in set_input()
633 afe_mux_cfg |= (chroma - CX18_AV_SVIDEO_CHROMA7) >> 2; in set_input()
637 afe_mux_cfg |= (chroma - CX18_AV_SVIDEO_CHROMA4) >> 4; in set_input()
/linux-6.15/Documentation/devicetree/bindings/media/
H A Dti,vpe.yaml15 path which can perform chroma up/down sampling, deinterlacing,
/linux-6.15/drivers/gpu/drm/nouveau/dispnv04/
H A Doverlay.c221 u32 chroma = ((sin_mul(plane->hue, plane->saturation) & 0xffff) << 16) | in nv10_set_params() local
227 nvif_wr32(dev, NV_PVIDEO_CHROMINANCE(0), chroma); in nv10_set_params()
228 nvif_wr32(dev, NV_PVIDEO_CHROMINANCE(1), chroma); in nv10_set_params()
/linux-6.15/drivers/gpu/drm/amd/display/dc/hubbub/dcn401/
H A Ddcn401_hubbub.c1092 output->video.chroma.dcc_controls.dcc_256_256 = 1; in hubbub401_get_dcc_compression_cap()
1093 output->video.chroma.dcc_controls.dcc_256_128 = 1; in hubbub401_get_dcc_compression_cap()
1094 output->video.chroma.dcc_controls.dcc_256_64 = 1; in hubbub401_get_dcc_compression_cap()
1097 output->video.chroma.dcc_controls.dcc_256_128 = 1; in hubbub401_get_dcc_compression_cap()
1098 output->video.chroma.dcc_controls.dcc_256_64 = 1; in hubbub401_get_dcc_compression_cap()
1101 output->video.chroma.dcc_controls.dcc_256_64 = 1; in hubbub401_get_dcc_compression_cap()
/linux-6.15/drivers/media/platform/mediatek/mdp3/
H A Dmdp_sm_mt8183.h37 struct img_offset chroma; member
H A Dmdp_sm_mt8195.h37 struct img_offset chroma; member
/linux-6.15/Documentation/devicetree/bindings/display/
H A Dallwinner,sun9i-a80-deu.yaml15 can sharpen the display content in both luma and chroma channels.
/linux-6.15/Documentation/userspace-api/
H A Ddma-buf-alloc-exchange.rst116 and chroma YUV samples are stored in separate planes, where the chroma plane is
117 stored at half the resolution in both dimensions (i.e. one U/V chroma
165 with an offset of 0, and the chroma plane's storage follows within the same buffer
270 the luma and chroma buffers combined into a single memory buffer by use of the
287 chroma) being dequeued by the user from V4L2. These planes are then exported to
/linux-6.15/drivers/media/i2c/cx25840/
H A Dcx25840-core.c1377 int chroma = vid_input & 0xf00; in set_input() local
1400 chroma < CX25840_SVIDEO_CHROMA4 || in set_input()
1401 chroma > CX25840_SVIDEO_CHROMA8) { in set_input()
1407 if (chroma >= CX25840_SVIDEO_CHROMA7) { in set_input()
1409 reg |= (chroma - CX25840_SVIDEO_CHROMA7) >> 2; in set_input()
1412 reg |= (chroma - CX25840_SVIDEO_CHROMA4) >> 4; in set_input()
1539 if (chroma >= CX25840_SVIDEO_CHROMA7) { in set_input()
/linux-6.15/drivers/gpu/drm/amd/display/dc/dce110/
H A Ddce110_mem_input_v.c528 bool chroma) in get_dvmm_hw_setting() argument
540 bpp = chroma ? bpp_16 : bpp_8; in get_dvmm_hw_setting()
/linux-6.15/Documentation/ABI/testing/
H A Dconfigfs-usb-gadget-uvc202 chroma values from the color primaries
219 chroma values from the color primaries

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