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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | /* SPDX-License-Identifier: LGPL-2.1+ */ /* * Copyright 2016 Tom aan de Wiel * Copyright 2018 Cisco Systems, Inc. and/or its affiliates. All rights reserved. */ #ifndef CODEC_FWHT_H #define CODEC_FWHT_H #include <linux/types.h> #include <linux/bitops.h> #include <asm/byteorder.h> /* * The compressed format consists of a fwht_cframe_hdr struct followed by the * compressed frame data. The header contains the size of that data. * Each Y, Cb and Cr plane is compressed separately. If the compressed * size of each plane becomes larger than the uncompressed size, then * that plane is stored uncompressed and the corresponding bit is set * in the flags field of the header. * * Each compressed plane consists of macroblocks and each macroblock * is run-length-encoded. Each macroblock starts with a 16 bit value. * Bit 15 indicates if this is a P-coded macroblock (1) or not (0). * P-coded macroblocks contain a delta against the previous frame. * * Bits 1-12 contain a number. If non-zero, then this same macroblock * repeats that number of times. This results in a high degree of * compression for generated images like colorbars. * * Following this macroblock header the MB coefficients are run-length * encoded: the top 12 bits contain the coefficient, the bottom 4 bits * tell how many times this coefficient occurs. The value 0xf indicates * that the remainder of the macroblock should be filled with zeroes. * * All 16 and 32 bit values are stored in big-endian (network) order. * * Each fwht_cframe_hdr starts with an 8 byte magic header that is * guaranteed not to occur in the compressed frame data. This header * can be used to sync to the next frame. * * This codec uses the Fast Walsh Hadamard Transform. Tom aan de Wiel * developed this as part of a university project, specifically for use * with this driver. His project report can be found here: * * https://hverkuil.home.xs4all.nl/fwht.pdf */ /* * This is a sequence of 8 bytes with the low 4 bits set to 0xf. * * This sequence cannot occur in the encoded data * * Note that these two magic values are symmetrical so endian issues here. */ #define FWHT_MAGIC1 0x4f4f4f4f #define FWHT_MAGIC2 0xffffffff /* * A macro to calculate the needed padding in order to make sure * both luma and chroma components resolutions are rounded up to * a multiple of 8 */ #define vic_round_dim(dim, div) (round_up((dim) / (div), 8) * (div)) struct fwht_cframe_hdr { u32 magic1; u32 magic2; __be32 version; __be32 width, height; __be32 flags; __be32 colorspace; __be32 xfer_func; __be32 ycbcr_enc; __be32 quantization; __be32 size; }; struct fwht_cframe { u16 i_frame_qp; u16 p_frame_qp; __be16 *rlc_data; s16 coeffs[8 * 8]; s16 de_coeffs[8 * 8]; s16 de_fwht[8 * 8]; u32 size; }; struct fwht_raw_frame { unsigned int width_div; unsigned int height_div; unsigned int luma_alpha_step; unsigned int chroma_step; unsigned int components_num; u8 *buf; u8 *luma, *cb, *cr, *alpha; }; #define FWHT_FRAME_PCODED BIT(0) #define FWHT_FRAME_UNENCODED BIT(1) #define FWHT_LUMA_UNENCODED BIT(2) #define FWHT_CB_UNENCODED BIT(3) #define FWHT_CR_UNENCODED BIT(4) #define FWHT_ALPHA_UNENCODED BIT(5) u32 fwht_encode_frame(struct fwht_raw_frame *frm, struct fwht_raw_frame *ref_frm, struct fwht_cframe *cf, bool is_intra, bool next_is_intra, unsigned int width, unsigned int height, unsigned int stride, unsigned int chroma_stride); bool fwht_decode_frame(struct fwht_cframe *cf, u32 hdr_flags, unsigned int components_num, unsigned int width, unsigned int height, const struct fwht_raw_frame *ref, unsigned int ref_stride, unsigned int ref_chroma_stride, struct fwht_raw_frame *dst, unsigned int dst_stride, unsigned int dst_chroma_stride); #endif |