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/linux/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
45 value of two consecutive pixels. It effectively models the chroma of a pixel
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
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H A Dpixfmt-yuv-planar.rst9 Planar formats split luma and chroma data in separate memory regions. They
13 stores the Y components. The second plane is the chroma plane and stores the
21 the chroma planes may be constrained by the line stride of the luma plane.
35 use two planes, and store the luma components in the first plane and the chroma
37 chroma plane, with Cb and Cr always stored in pairs. The chroma order is
41 chroma lines is identical to the padding of the luma lines. Without horizontal
42 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
47 relationship between the luma and chroma line padding and stride.
65 - Chroma order [1]_
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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 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,
215 the latter assume a certain color. Chroma-keying makes no sense
241 - The device supports Source Chroma-keying. Video pixels with the
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 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 Ddev-overlay.rst93 1. Chroma-keying displays the overlaid image only where pixels in the
181 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.
190 Chroma automatic gain control.
193 Adjusts the Chroma gain control (for use when chroma AGC is
247 - The Cb and Cr chroma components are replaced by fixed coefficients
/linux/drivers/staging/media/atomisp/pci/isp/kernels/ctc/ctc2/
H A Dia_css_ctc2_param.h22 /* CTC (Chroma Tone Control)ISP Parameters */
35 /*DMEM Chroma params*/
37 /* Gains by UV(Chroma) under kneepoints uv_x0 and uv_x1*/
41 /* Kneepoints by UV(Chroma)- uv_x0 and uv_x1*/
H A Dia_css_ctc2_types.h19 /* Chroma Tone Control configuration.
43 /* Gains by UV(Chroma) under threholds uv_x0 and uv_x1
48 /* Minimum and Maximum Thresholds by UV(Chroma)- uv_x0 and uv_x1
/linux/drivers/media/platform/samsung/s5p-mfc/
H A Dregs-mfc.h102 /* reconstructed chroma */
135 #define S5P_FIMV_ENC_REF_B_CHROMA_ADR 0x0630 /* ref B Chroma addr */
138 #define S5P_FIMV_ENC_CUR_CHROMA_ADR 0x071C /* current Chroma addr */
167 #define S5P_FIMV_SI_DISPLAY_C_ADR 0x2014 /* chroma addrof displayed pic */
174 #define S5P_FIMV_SI_DECODE_C_ADR 0x2028 /* chroma addrof decoded pic */
191 #define S5P_FIMV_CRC_CHROMA0 0x2034 /* chroma crc data per frame
195 #define S5P_FIMV_CRC_CHROMA1 0x203c /* chroma crc data per bottom
275 chroma pic */
280 #define S5P_FIMV_ENC_SI_CH0_CUR_C_ADR 0x2054 /* current Chroma addr */
286 #define S5P_FIMV_ENC_SI_CH1_CUR_C_ADR 0x2094 /* current Chroma addr */
/linux/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/drivers/staging/media/atomisp/pci/isp/kernels/gc/gc_1.0/
H A Dia_css_gc_types.h71 /* Chroma Enhancement configuration.
73 * This parameter specifies range of chroma output level.
81 u8 uv_level_min; /** Minimum of chroma output level.
83 u8 uv_level_max; /** Maximum of chroma output level.
/linux/drivers/gpu/drm/msm/disp/dpu1/
H A Ddpu_hw_cdm.h82 * struct dpu_hw_cdm_ops : Interface to the chroma down Hw driver functions
93 * @cdm Pointer to chroma down context
99 * @cdm Pointer to chroma down context
117 /* chroma down */
H A Ddpu_hw_cdm.c55 * Horizontal coefficients for cosite chroma downscale
61 * Horizontal coefficients for offsite chroma downscale
66 * Vertical coefficients for cosite chroma downscale
70 * Vertical coefficients for offsite chroma downscale
/linux/drivers/gpu/drm/imx/dcss/
H A Ddcss-scaler.c492 /* adjustments for source chroma location */ in dcss_scaler_fractions_set()
494 /* vertical input chroma position adjustment */ in dcss_scaler_fractions_set()
499 * move chroma up to first luma line in dcss_scaler_fractions_set()
500 * (1/4 chroma input line spacing) in dcss_scaler_fractions_set()
507 * move chroma up to first luma line in dcss_scaler_fractions_set()
508 * (1/2 chroma input line spacing) in dcss_scaler_fractions_set()
515 /* horizontal input chroma position adjustment */ in dcss_scaler_fractions_set()
520 /* move chroma left 1/4 chroma input sample spacing */ in dcss_scaler_fractions_set()
528 /* adjustments to chroma resolution */ in dcss_scaler_fractions_set()
544 /* save chroma start phase */ in dcss_scaler_fractions_set()
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/linux/drivers/staging/media/atomisp/pci/isp/kernels/ctc/ctc_1.0/
H A Dia_css_ctc_types.h22 * CSS-API header file for Chroma Tone Control parameters.
28 * of gain(=8), but also the bits(=5) to convert chroma
53 /* Chroma Tone Control configuration.
100 /* CTC table, used for Chroma Tone Control.
/linux/drivers/gpu/drm/amd/display/dc/dcn30/
H A Ddcn30_mmhubbub.c113 /* buffer address for Chroma in planar mode (unused in packing mode) */ in mmhubbub3_config_mcif_buf()
121 /* buffer address for Chroma in planar mode (unused in packing mode) */ in mmhubbub3_config_mcif_buf()
129 /* buffer address for Chroma in planar mode (unused in packing mode) */ in mmhubbub3_config_mcif_buf()
137 /* buffer address for Chroma in planar mode (unused in packing mode) */ in mmhubbub3_config_mcif_buf()
141 /* setup luma & chroma size in mmhubbub3_config_mcif_buf()
208 /* Set arbitration unit for Luma/Chroma */ in mmhubbub3_config_mcif_arb()
/linux/drivers/gpu/drm/amd/display/dc/mmhubbub/dcn32/
H A Ddcn32_mmhubbub.c113 /* buffer address for Chroma in planar mode (unused in packing mode) */ in mmhubbub32_config_mcif_buf()
121 /* buffer address for Chroma in planar mode (unused in packing mode) */ in mmhubbub32_config_mcif_buf()
129 /* buffer address for Chroma in planar mode (unused in packing mode) */ in mmhubbub32_config_mcif_buf()
137 /* buffer address for Chroma in planar mode (unused in packing mode) */ in mmhubbub32_config_mcif_buf()
141 /* setup luma & chroma size in mmhubbub32_config_mcif_buf()
208 /* Set arbitration unit for Luma/Chroma */ in mmhubbub32_config_mcif_arb()
/linux/drivers/media/i2c/
H A Dks0127.c219 table[KS_CDEM] = 0x00; /* Chroma Demodulation Control */ in init_reg_defaults()
224 table[KS_CHROMA] = 0x2a; /* Chroma control A */ in init_reg_defaults()
225 table[KS_CHROMB] = 0x90; /* Chroma control B */ in init_reg_defaults()
226 table[KS_DEMOD] = 0x00; /* Chroma Demodulation Control & Status */ in init_reg_defaults()
256 table[KS_CTRACK] = 0x00; /* Chroma Tracking Control */ in init_reg_defaults()
417 /* enable chroma demodulation */ in ks0127_s_routing()
419 /* chroma trap, HYBWR=1 */ in ks0127_s_routing()
424 /* manual chroma comb .25 .5 .25 */ in ks0127_s_routing()
427 /* chroma path delay */ in ks0127_s_routing()
451 /* enable chroma demodulation */ in ks0127_s_routing()
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/linux/drivers/staging/media/atomisp/pci/isp/kernels/eed1_8/
H A Dia_css_eed1_8_types.h48 …s32 fcthres_0; /** Threshold to prevent chroma coring due to noise or green disparity in dark regi…
49 …s32 fcthres_1; /** Threshold to prevent chroma coring due to noise or green disparity in bright re…
51 s32 fc_coring_prm; /** Chroma coring coefficient for tint color suppression. */
/linux/drivers/gpu/drm/amd/display/dc/mmhubbub/dcn20/
H A Ddcn20_mmhubbub.c91 /* buffer address for Chroma in planar mode (unused in packing mode) */ in mmhubbub2_config_mcif_buf()
103 /* buffer address for Chroma in planar mode (unused in packing mode) */ in mmhubbub2_config_mcif_buf()
115 /* buffer address for Chroma in planar mode (unused in packing mode) */ in mmhubbub2_config_mcif_buf()
127 /* buffer address for Chroma in planar mode (unused in packing mode) */ in mmhubbub2_config_mcif_buf()
133 /* setup luma & chroma size in mmhubbub2_config_mcif_buf()
201 /* Set arbitration unit for Luma/Chroma */ in mmhubbub2_config_mcif_arb()
/linux/drivers/staging/media/atomisp/pci/isp/kernels/fc/fc_1.0/
H A Dia_css_formats_types.h35 1 - full range, luma 0-255, chroma 0-255\n
36 0 - reduced range, luma 16-235, chroma 16-240 */
/linux/drivers/media/platform/st/sti/bdisp/
H A Dbdisp-reg.h45 /* 9 - Chroma Filter */
206 #define BLT_TTY_CHROMA BIT(27) /* Write chroma / luma */
210 #define BLT_S1TY_CHROMA_EXT BIT(26) /* Chroma Extended */
215 #define BLT_S2TY_CHROMA_EXT BIT(26) /* Chroma Extended */
/linux/drivers/video/fbdev/core/
H A Dfbmon.c330 DPRINTK(" Chroma\n"); in get_chroma()
335 specs->chroma.redx = tmp/1024; in get_chroma()
336 DPRINTK(" RedX: 0.%03d ", specs->chroma.redx); 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()
348 DPRINTK(" GreenX: 0.%03d ", specs->chroma.greenx); 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()
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/linux/drivers/media/platform/st/sti/delta/
H A Ddelta-mjpeg-fw.h17 * @display_chroma_p: address of the chroma buffer
32 * @display_chroma_p: address of the chroma buffer
34 * @display_decimated_chroma_p: address of the decimated chroma buffer

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