On 2018-05-14 10:05 PM, Manasi Navare wrote:
> This patch defines a new header file for all the DSC 1.2 structures
> and creates a structure for PPS infoframe which will be used to send
> picture parameter set secondary data packet for display stream compression.
> All the PPS infoframe syntax elements are taken from DSC 1.2 specification
> from VESA.
>
> v2:
> * Fix the comments for kernel-doc
>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
> Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
> ---
> include/drm/drm_dsc.h | 437 ++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 437 insertions(+)
> create mode 100644 include/drm/drm_dsc.h
>
> diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
> new file mode 100644
> index 0000000..5ee72e8
> --- /dev/null
> +++ b/include/drm/drm_dsc.h
> @@ -0,0 +1,437 @@
> +/*
> + * Copyright (C) 2018 Intel Corp.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
> + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> + * OTHER DEALINGS IN THE SOFTWARE.
> + *
> + * Authors:
> + * Manasi Navare <manasi.d.navare@xxxxxxxxx>
> + */
> +
> +#ifndef DRM_DSC_H_
> +#define DRM_DSC_H_
> +
> +#include <drm/drm_dp_helper.h>
> +
> +#define DSC_NUM_BUF_RANGES 15
> +
> +/**
> + * struct picture_parameter_set - Represents 128 bytes of Picture Parameter Set
> + *
> + * The VESA DSC standard defines picture parameter set (PPS) which display stream
> + * compression encoders must communicate to decoders. The PPS is encapsulated
> + * in 128 bytes (PPS 0 through PPS 127). The fields in this structure are as per
> + * Table 4.1 in Vesa DSC specification v1.1/v1.2.
> + * The PPS fields that span over more than a byte should be stored in Big Endian
> + * format.
> + */
> +struct picture_parameter_set {
> + /**
> + * @dsc_version_minor:
> + * PPS0[3:0] - Contains Minor version of DSC
> + */
> + u8 dsc_version_minor:4;
> + /**
> + * @dsc_version_major:
> + * PPS0[7:4] - Contains major version of DSC
> + */
> + u8 dsc_version_major:4;
> + /**
> + * @pps_identifier:
> + * PPS1[7:0] - Application specific identifier that can be
> + * used to differentiate between different PPS tables.
> + */
> + u8 pps_identifier;
> + /**
> + * @pps2_reserved:
> + * PPS2[7:0]- RESERVED Byte
> + */
> + u8 pps2_reserved;
> + /**
> + * @linebuf_depth:
> + * PPS3[3:0] - Contains linebuffer bit depth used to generate
> + * the bitstream. (0x0 - 16 bits for DSc 1.2, 0x8 - 8 bits,
> + * 0xA - 10 bits, 0xB - 11 bits, 0xC - 12 bits, 0xD - 13 bits,
> + * 0xE - 14 bits for DSC1.2, 0xF - 14 bits for DSC 1.2.
> + */
> + u8 linebuf_depth:4;
> + /**
> + * @bits_per_component:
> + * PPS3[7:4] - Bits per component fo rthe original pixels
typo: "for the"
> + * of the encoded picture.
> + */
Would it make sense to indicate in the comments what the values mean?
>From the spec:
0x0 = 16bpc (allowed only when dsc_version_minor = 0x2).
0x8 = 8bpc.
0xA = 10bpc.
0xC = 12bpc.
0xE = 14bpc (allowed only when dsc_version_minor = 0x2).
All other encodings are RESERVED.
Harry
> + u8 bits_per_component:4;
> + /**
> + * @bpp_high:
> + * PPS4[1:0] - These are the most significant 2 bits of
> + * compressed BPP bits_per_pixel[9:0] syntax element.
> + */
> + u8 bpp_high:2;
> + /**
> + * @vbr_enable:
> + * PPS4[2] - 0 = VBR disabled, 1 = VBR enabled
> + */
> + u8 vbr_enable:1;
> + /**
> + * @simple_422:
> + * PPS4[3] - Indicates if decoder drops samples to
> + * reconstruct the 4:2:2 picture.
> + */
> + u8 simple_422:1;
> + /**
> + * @convert_rgb:
> + * PPS4[4] - Indicates if DSC color space conversion is active
> + */
> + u8 convert_rgb:1;
> + /**
> + * @block_pred_enable:
> + * PPS4[5] - Indicates if BP is used to code any groups in picture
> + */
> + u8 block_pred_enable:1;
> + /**
> + * @pps4_reserved:
> + * PPS4[7:6] - Reseved bits
> + */
> + u8 pps4_reserved:2;
> + /**
> + * @bpp_low:
> + * PPS5[7:0] - This indicates the lower significant 8 bits of
> + * the compressed BPP bits_per_pixel[9:0] element.
> + */
> + u8 bpp_low;
> + /**
> + * @pic_height:
> + * PPS6[7:0], PPS7[7:0] - Specifies the number of pixel rows within
> + * the raster.
> + */
> + u16 pic_height;
> + /**
> + * @pic_width:
> + * PPS8[7:0], PPS9[7:0] - Number of pixel columns within the raster.
> + */
> + u16 pic_width;
> + /**
> + * @slice_height:
> + * PPS10[7:0], PPS11[7:0] - Slice height in units of pixels.
> + */
> + u16 slice_height;
> + /**
> + * @slice_width:
> + * PPS12[7:0], PPS13[7:0] - Slice width in terms of pixels.
> + */
> + u16 slice_width;
> + /**
> + * @chunk_size:
> + * PPS14[7:0], PPS15[7:0] - Size in units of bytes of the chunks
> + * that are used for slice multiplexing.
> + */
> + u16 chunk_size;
> + /**
> + * @initial_xmit_delay_high:
> + * PPS16[1:0] - Most Significant two bits of initial transmission delay.
> + * It specifies the number of pixel times that the encoder waits before
> + * transmitting data from its rate buffer.
> + */
> + u8 initial_xmit_delay_high:2;
> + /**
> + * @pps16_reserved:
> + * PPS16[7:2] - Reserved
> + */
> + u8 pps16_reserved:6;
> + /**
> + * @initial_xmit_delay_low:
> + * PPS17[7:0] - Least significant 8 bits of initial transmission delay.
> + */
> + u8 initial_xmit_delay_low;
> + /**
> + * @initial_dec_delay:
> + *
> + * PPS18[7:0], PPS19[7:0] - Initial decoding delay which is the number
> + * of pixel times that the decoder accumulates data in its rate buffer
> + * before starting to decode and output pixels.
> + */
> + u16 initial_dec_delay;
> + /**
> + * @pps20_reserved:
> + *
> + * PPS20[7:0] - Reserved
> + */
> + u8 pps20_reserved;
> + /**
> + * @initial_scale_value:
> + * PPS21[5:0] - Initial rcXformScale factor used at beginning
> + * of a slice.
> + */
> + u8 initial_scale_value:6;
> + /**
> + * @pps21_reserved:
> + * PPS21[7:6] - Reserved
> + */
> + u8 pps21_reserved:2;
> + /**
> + * @scale_increment_interval:
> + * PPS22[7:0], PPS23[7:0] - Number of group times between incrementing
> + * the rcXformScale factor at end of a slice.
> + */
> + u16 scale_increment_interval;
> + /**
> + * @scale_decrement_interval_high:
> + * PPS24[3:0] - Higher 4 bits indicating number of group times between
> + * decrementing the rcXformScale factor at beginning of a slice.
> + */
> + u8 scale_decrement_interval_high:4;
> + /**
> + * @pps24_reserved:
> + * PPS24[7:4] - Reserved
> + */
> + u8 pps24_reserved:4;
> + /**
> + * @scale_decrement_interval_low:
> + * PPS25[7:0] - Lower 8 bits of scale decrement interval
> + */
> + u8 scale_decrement_interval_low;
> + /**
> + * @pps26_reserved:
> + * PPS26[7:0]
> + */
> + u8 pps26_reserved;
> + /**
> + * @first_line_bpg_offset:
> + * PPS27[4:0] - Number of additional bits that are allocated
> + * for each group on first line of a slice.
> + */
> + u8 first_line_bpg_offset:5;
> + /**
> + * @pps27_reserved:
> + * PPS27[7:5]
> + */
> + u8 pps27_reserved:3;
> + /**
> + * @nfl_bpg_offset:
> + * PPS28[7:0], PPS29[7:0] - Number of bits including frac bits
> + * deallocated for each group for groups after the first line of slice.
> + */
> + u16 nfl_bpg_offset;
> + /**
> + * @slice_bpg_offset:
> + * PPS30, PPS31[7:0] - Number of bits that are deallocated for each group
> + * to enforce the slice constraint.
> + */
> + u16 slice_bpg_offset;
> + /**
> + * @initial_offset:
> + * PPS32,33[7:0] - Initial value for rcXformOffset
> + */
> + u16 initial_offset;
> + /**
> + * @final_offset:
> + * PPS34,35[7:0] - Maximum end-of-slice value for rcXformOffset
> + */
> + u16 final_offset;
> + /**
> + * @flatness_min_qp:
> + * PPS36[4:0] - Minimum QP at which flatness is signaled and
> + * flatness QP adjustment is made.
> + */
> + u8 flatness_min_qp:5;
> + /**
> + * @pps36_reserved:
> + * PPS36[7:5] - Reserved
> + */
> + u8 pps36_reserved:3;
> + /**
> + * @flatness_max_qp:
> + * PPS37[4:0] - Max QP at which flatness is signalled and
> + * the flatness adjustment is made.
> + */
> + u8 flatness_max_qp:5;
> + /**
> + * @pps37_reserved:
> + * PPS37[7:5]
> + */
> + u8 pps37_reserved:3;
> + /**
> + * @rc_model_size:
> + * PPS38,39[7:0] - Number of bits within RC Model.
> + */
> + u16 rc_model_size;
> + /**
> + * @rc_edge_factor:
> + * PPS40[3:0] - Ratio of current activity vs, previous
> + * activity to determine presence of edge.
> + */
> + u8 rc_edge_factor:4;
> + /**
> + * @pps40_reserved:
> + * PPS40[7:4]
> + */
> + u8 pps40_reserved:4;
> + /**
> + * @rc_quant_incr_limit0:
> + * PPS41[4:0] - QP threshold used in short term RC
> + */
> + u8 rc_quant_incr_limit0:5;
> + /**
> + * @pps41_reserved:
> + * PPS41[7:5]
> + */
> + u8 pps41_reserved:3;
> + /**
> + * @rc_quant_incr_limit1:
> + * PPS42[4:0] - QP threshold used in short term RC
> + */
> + u8 rc_quant_incr_limit1:5;
> + /**
> + * @pps42_reserved:
> + * PPS42[7:5]
> + */
> + u8 pps42_reserved:3;
> + /**
> + * @rc_tgt_offset_lo:
> + * Lower end of the variability range around the target
> + * bits per group that is allowed by short term RC.
> + */
> + u8 rc_tgt_offset_lo:4;
> + /**
> + * @rc_tgt_offset_hi:
> + * Upper end of the variability range around the target
> + * bits per group that i allowed by short term rc.
> + */
> + u8 rc_tgt_offset_hi:4;
> + /**
> + * @rc_buf_thresh:
> + * PPS44[7:0] - PPS57[7:0] - Specifies the thresholds in RC model for
> + * the 15 ranges defined by 14 thresholds.
> + */
> + u8 rc_buf_thresh[DSC_NUM_BUF_RANGES - 1];
> + /**
> + * @rc_range_parameters:
> + * PPS58[7:0] - PPS87[7:0]
> + * Parameters that correspond to each of the 15 ranges.
> + */
> + u16 rc_range_parameters[DSC_NUM_BUF_RANGES];
> + /**
> + * @native_422:
> + * PPS88[0] - 0 = Native 4:2:2 not used
> + * 1 = Native 4:2:2 used
> + */
> + u8 native_422:1;
> + /**
> + * @native_420:
> + * PPS88[1] - 0 = Native 4:2:0 not used
> + * 1 = Native 4:2:0 not used.
> + */
> + u8 native_420:1;
> + /**
> + * @pps88_reserved:
> + * PPS[7:2] - Reserved 6 bits
> + */
> + u8 pps88_reserved:6;
> + /**
> + * @second_line_bpg_offset:
> + * PPS89[4:0] - Additional bits/group budget for the
> + * second line of a slice in Native 4:2:0 mode.
> + * Set to 0 if DSC minor version is 1 or native420 is 0.
> + */
> + u8 second_line_bpg_offset:5;
> + /**
> + * @pps89_reserved:
> + * PPS89[7:5] - Reserved
> + */
> + u8 pps89_reserved:3;
> + /**
> + * @nsl_bpg_offset:
> + * PPS90[7:0], PPS91[7:0] - Number of bits that are deallocated
> + * for each group that is not in the second line of a slice.
> + */
> + u16 nsl_bpg_offset;
> + /**
> + * @second_line_offset_adj:
> + * PPS92[7:0], PPS93[7:0] - Used as offset adjustment for the second
> + * line in Native 4:2:0 mode.
> + */
> + u16 second_line_offset_adj;
> + /**
> + * @pps_long_94_reserved:
> + * PPS 94, 95, 96, 97 - Reserved
> + */
> + u32 pps_long_94_reserved;
> + /**
> + * @pps_long_98_reserved:
> + * PPS 98, 99, 100, 101 - Reserved
> + */
> + u32 pps_long_98_reserved;
> + /**
> + * @pps_long_102_reserved:
> + * PPS 102, 103, 104, 105 - Reserved
> + */
> + u32 pps_long_102_reserved;
> + /**
> + * @pps_long_106_reserved:
> + * PPS 106, 107, 108, 109 - reserved
> + */
> + u32 pps_long_106_reserved;
> + /**
> + * @pps_long_110_reserved:
> + * PPS 110, 111, 112, 113 - reserved
> + */
> + u32 pps_long_110_reserved;
> + /**
> + * @pps_long_114_reserved:
> + * PPS 114 - 117 - reserved
> + */
> + u32 pps_long_114_reserved;
> + /**
> + * @pps_long_118_reserved:
> + * PPS 118 - 121 - reserved
> + */
> + u32 pps_long_118_reserved;
> + /**
> + * @pps_long_122_reserved:
> + * PPS 122- 125 - reserved
> + */
> + u32 pps_long_122_reserved;
> + /**
> + * @pps_short_126_reserved:
> + * PPS 126, 127 - reserved
> + */
> + u16 pps_short_126_reserved;
> +};
> +
> +/**
> +* struct drm_dsc_pps_infoframe - DSC infoframe carrying the Picture Parameter Set Metadata
> +*
> +* This structure represents the DSC PPS infoframe required to send the Picture Parameter Set
> +* metadata required before enabling VESA Display Stream Compression. This is based on the
> +* DP Secondary Data Packet structure and comprises of SDP Header as defined in drm_dp_helper.h
> +* and PPS payload.
> +*
> +* @pps_header:
> +*
> +* Header for PPS as per DP SDP header format
> +*
> +* @pps_payload:
> +*
> +* PPS payload fields as per DSC specification Table 4-1
> +*/
> +struct drm_dsc_pps_infoframe {
> + struct dp_sdp_header pps_header;
> + struct picture_parameter_set pps_payload;
> +} __packed;
> +
> +#endif /* _DRM_DSC_H_ */
>
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