119 lines
3.7 KiB
C
119 lines
3.7 KiB
C
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/* SPDX-License-Identifier: LGPL-2.1+ */
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/*
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* Copyright 2016 Tom aan de Wiel
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* Copyright 2018 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*/
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#ifndef CODEC_FWHT_H
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#define CODEC_FWHT_H
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#include <linux/types.h>
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#include <linux/bitops.h>
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#include <asm/byteorder.h>
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/*
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* The compressed format consists of a fwht_cframe_hdr struct followed by the
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* compressed frame data. The header contains the size of that data.
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* Each Y, Cb and Cr plane is compressed separately. If the compressed
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* size of each plane becomes larger than the uncompressed size, then
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* that plane is stored uncompressed and the corresponding bit is set
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* in the flags field of the header.
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*
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* Each compressed plane consists of macroblocks and each macroblock
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* is run-length-encoded. Each macroblock starts with a 16 bit value.
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* Bit 15 indicates if this is a P-coded macroblock (1) or not (0).
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* P-coded macroblocks contain a delta against the previous frame.
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*
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* Bits 1-12 contain a number. If non-zero, then this same macroblock
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* repeats that number of times. This results in a high degree of
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* compression for generated images like colorbars.
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*
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* Following this macroblock header the MB coefficients are run-length
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* encoded: the top 12 bits contain the coefficient, the bottom 4 bits
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* tell how many times this coefficient occurs. The value 0xf indicates
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* that the remainder of the macroblock should be filled with zeroes.
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*
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* All 16 and 32 bit values are stored in big-endian (network) order.
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*
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* Each fwht_cframe_hdr starts with an 8 byte magic header that is
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* guaranteed not to occur in the compressed frame data. This header
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* can be used to sync to the next frame.
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*
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* This codec uses the Fast Walsh Hadamard Transform. Tom aan de Wiel
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* developed this as part of a university project, specifically for use
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* with this driver. His project report can be found here:
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*
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* https://hverkuil.home.xs4all.nl/fwht.pdf
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*/
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/*
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* This is a sequence of 8 bytes with the low 4 bits set to 0xf.
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*
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* This sequence cannot occur in the encoded data
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*
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* Note that these two magic values are symmetrical so endian issues here.
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*/
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#define FWHT_MAGIC1 0x4f4f4f4f
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#define FWHT_MAGIC2 0xffffffff
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/*
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* A macro to calculate the needed padding in order to make sure
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* both luma and chroma components resolutions are rounded up to
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* a multiple of 8
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*/
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#define vic_round_dim(dim, div) (round_up((dim) / (div), 8) * (div))
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struct fwht_cframe_hdr {
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u32 magic1;
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u32 magic2;
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__be32 version;
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__be32 width, height;
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__be32 flags;
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__be32 colorspace;
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__be32 xfer_func;
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__be32 ycbcr_enc;
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__be32 quantization;
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__be32 size;
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};
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struct fwht_cframe {
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u16 i_frame_qp;
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u16 p_frame_qp;
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__be16 *rlc_data;
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s16 coeffs[8 * 8];
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s16 de_coeffs[8 * 8];
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s16 de_fwht[8 * 8];
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u32 size;
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};
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struct fwht_raw_frame {
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unsigned int width_div;
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unsigned int height_div;
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unsigned int luma_alpha_step;
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unsigned int chroma_step;
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unsigned int components_num;
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u8 *buf;
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u8 *luma, *cb, *cr, *alpha;
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};
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#define FWHT_FRAME_PCODED BIT(0)
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#define FWHT_FRAME_UNENCODED BIT(1)
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#define FWHT_LUMA_UNENCODED BIT(2)
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#define FWHT_CB_UNENCODED BIT(3)
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#define FWHT_CR_UNENCODED BIT(4)
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#define FWHT_ALPHA_UNENCODED BIT(5)
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u32 fwht_encode_frame(struct fwht_raw_frame *frm,
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struct fwht_raw_frame *ref_frm,
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struct fwht_cframe *cf,
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bool is_intra, bool next_is_intra,
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unsigned int width, unsigned int height,
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unsigned int stride, unsigned int chroma_stride);
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bool fwht_decode_frame(struct fwht_cframe *cf, u32 hdr_flags,
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unsigned int components_num, unsigned int width,
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unsigned int height, const struct fwht_raw_frame *ref,
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unsigned int ref_stride, unsigned int ref_chroma_stride,
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struct fwht_raw_frame *dst, unsigned int dst_stride,
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unsigned int dst_chroma_stride);
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#endif
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