130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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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 VICODEC_RLC_H
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#define VICODEC_RLC_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 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 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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* Note: bit 0 of the header must always be 0. Otherwise it cannot
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* be guaranteed that the magic 8 byte sequence (see below) can
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* never occur in the rlc output.
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*/
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#define PFRAME_BIT (1 << 15)
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#define DUPS_MASK 0x1ffe
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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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#define VICODEC_MAGIC1 0x4f4f4f4f
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#define VICODEC_MAGIC2 0xffffffff
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#define VICODEC_VERSION 1
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#define VICODEC_MAX_WIDTH 3840
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#define VICODEC_MAX_HEIGHT 2160
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#define VICODEC_MIN_WIDTH 640
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#define VICODEC_MIN_HEIGHT 480
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#define PBLOCK 0
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#define IBLOCK 1
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/* Set if this is an interlaced format */
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#define VICODEC_FL_IS_INTERLACED BIT(0)
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/* Set if this is a bottom-first (NTSC) interlaced format */
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#define VICODEC_FL_IS_BOTTOM_FIRST BIT(1)
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/* Set if each 'frame' contains just one field */
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#define VICODEC_FL_IS_ALTERNATE BIT(2)
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/*
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* If VICODEC_FL_IS_ALTERNATE was set, then this is set if this
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* 'frame' is the bottom field, else it is the top field.
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*/
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#define VICODEC_FL_IS_BOTTOM_FIELD BIT(3)
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/* Set if this frame is uncompressed */
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#define VICODEC_FL_LUMA_IS_UNCOMPRESSED BIT(4)
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#define VICODEC_FL_CB_IS_UNCOMPRESSED BIT(5)
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#define VICODEC_FL_CR_IS_UNCOMPRESSED BIT(6)
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struct 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 cframe {
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unsigned int width, height;
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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 raw_frame {
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unsigned int width, height;
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unsigned int chroma_step;
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u8 *luma, *cb, *cr;
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};
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#define FRAME_PCODED BIT(0)
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#define FRAME_UNENCODED BIT(1)
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#define LUMA_UNENCODED BIT(2)
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#define CB_UNENCODED BIT(3)
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#define CR_UNENCODED BIT(4)
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u32 encode_frame(struct raw_frame *frm, struct raw_frame *ref_frm,
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struct cframe *cf, bool is_intra, bool next_is_intra);
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void decode_frame(struct cframe *cf, struct raw_frame *ref, u32 hdr_flags);
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#endif
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