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Supports RawFormat 8, used by the S1II, S5II and GH6. Outputs the Bayer mosaic, with the sensor borders as cropping and the black and white levels as raw color params side data. The as-shot white balance (tags 0x24 - 0x26) is exported as AVRW2RawColorParams, and the TIFF and EXIF tags of IFD0 and its sub-IFDs as EXIF side data, gathered during the single header walk and attached without re-parsing. The orientation becomes a display matrix; Panasonic's raw parameters, the previews and the strip pointers are left out. The whole file is given as one packet. Bit-exact with LibRaw on 801 S1II files, at 3x its speed per thread.
103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/*
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* Panasonic RW2 raw image decoder
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* Copyright (c) 2026 Lynne <dev@lynne.ee>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_RW2_H
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#define AVCODEC_RW2_H
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#include <stdint.h>
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#include "libavutil/frame.h"
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#include "libavutil/pixfmt.h"
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#include "vlc.h"
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#define RW2_MAX_STRIPES 5
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#define RW2_MAX_IFD0_ENTRIES 512 /* parser cap, sizes exif[] */
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#define RW2_JOINT_CATS 13 /* categories with a code per magnitude, 2^k each */
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#define RW2_MAX_CODES ((1 << RW2_JOINT_CATS) + 17)
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typedef struct RW2Stripe {
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uint32_t offset; /* bytes, from the start of the file */
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uint32_t size_bits;
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uint32_t left;
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uint32_t width;
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uint32_t height;
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} RW2Stripe;
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/* Coding parameters, tags 0x39 - 0x41 */
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typedef struct RW2Coding {
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uint32_t gamma_shift[6]; /* 0x39 */
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uint16_t gamma_point[6]; /* 0x3A */
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int datamax; /* 0x3B */
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int initial[4]; /* 0x3C - 0x3F */
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uint8_t code_len[17]; /* 0x40, Huffman code per magnitude category */
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uint16_t code_val[17];
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uint8_t code_shift[17]; /* 0x41, magnitude bits left out */
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} RW2Coding;
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/* IFD0 contents, RawFormat 8 */
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typedef struct RW2Header {
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int raw_width, raw_height;
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int border[4]; /* top, left, bottom, right */
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int cfa;
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int bpp;
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int raw_format;
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int orientation;
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int black[3];
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int linearity[3];
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int wb[3]; /* as-shot white balance levels */
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RW2Coding c;
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int nb_stripes;
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RW2Stripe stripes[RW2_MAX_STRIPES];
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/* Standard IFD0 tags kept verbatim for EXIF, gathered during the header
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* walk, with the IFD0 offset and where the metadata ends (first preview) */
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uint8_t exif[RW2_MAX_IFD0_ENTRIES * 12];
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int exif_count;
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uint32_t exif_off;
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int64_t exif_end;
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} RW2Header;
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typedef struct RW2Code {
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uint8_t len;
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uint16_t code;
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int16_t sym;
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} RW2Code;
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typedef struct RW2DecContext {
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AVFrame *frame;
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void *hwaccel_picture_private;
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enum AVPixelFormat pix_fmt;
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RW2Header h;
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const uint8_t *payload;
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VLC vlc;
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RW2Code codes[RW2_MAX_CODES];
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uint16_t gamma[1 << 16];
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int use_gamma;
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} RW2DecContext;
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#endif /* AVCODEC_RW2_H */
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