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f8b7f05844
After an extended Ghidra session, it turns out that the camera/recorder bakes a custom curve that *has* to be applied. It contains both the camera's inverse transfer curve, plus whatever else the camera applied. It could (and does) contain quantization refinements. And its used to switch between low and high quality encoding by boosting coeffs (thus acting as an additional dequant curve).
69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/*
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* ProRes RAW decoder
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* Copyright (c) 2025 Lynne
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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_PRORES_RAW_H
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#define AVCODEC_PRORES_RAW_H
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#include "libavutil/frame.h"
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#include "libavutil/mem_internal.h"
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#include "libavutil/pixfmt.h"
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#include "bytestream.h"
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#include "blockdsp.h"
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#include "proresdsp.h"
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typedef struct TileContext {
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GetByteContext gb;
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unsigned x, y;
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int log2_nb_blocks;
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} TileContext;
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typedef struct ProResRAWContext {
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ProresDSPContext prodsp;
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BlockDSPContext bdsp;
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TileContext *tiles;
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unsigned int tiles_size;
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int nb_tiles;
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int th;
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int nb_tw, nb_th;
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enum AVPixelFormat pix_fmt;
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AVFrame *frame;
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void *hwaccel_picture_private;
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int version;
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DECLARE_ALIGNED(32, uint8_t, scan)[64];
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DECLARE_ALIGNED(32, uint8_t, qmat)[64];
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/* 8-point combined linearization curve
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* (inv. transfer fn + encoder-defined shaping) from the frame header,
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* applied after iDCT */
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uint16_t lin_curve[8];
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} ProResRAWContext;
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extern const uint8_t ff_prores_raw_dc_cb[13];
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extern const int16_t ff_prores_raw_ac_cb[95];
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extern const int16_t ff_prores_raw_rn_cb[28];
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extern const int16_t ff_prores_raw_ln_cb[15];
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#endif /* AVCODEC_PRORES_RAW_H */
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