forked from len0rd/rockbox
b8238f7b20
Added jpeg decoder jpegp.c using RAINBOW lib. Currently enabled only for pictures not supported by old decoder (as old decoder more optimized for low mem targets) Someone TODO: * Old decoder has optimized downscale logic which new decoder doesn't have (it gives big difference in required memory and time for decoding). This logic should be ported/adapted if possible. * Add smooth downscaling. * Grayscale support Change-Id: Ie96bc62848b51cc6a3942f8e069ec6ab02dc1c56
147 lines
4.7 KiB
C
147 lines
4.7 KiB
C
/* Copyright (c) 2017 A. Tarpai
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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enum JPEGENUM {
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JPEGENUM_OK=1,
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JPEGENUMERR_MISSING_SOI = -999, // file doesnt start with SOI
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JPEGENUMERR_UNKNOWN_SOF, // differential frame?
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JPEGENUMERR_COMP4, // more than 4 components in file
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JPEGENUMERR_MALLOC, // malloc failed
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JPEGENUMERR_NODHT, // no DHT found
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JPEGENUMERR_NODQT, // no DQT found
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JPEGENUMERR_QTREDEF, // not implemented (*)
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JPEGENUMERR_MARKERC8, // JPG-1 extension?
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JPEGENUMERR_MARKERDNL, // DNL marker found (not supported)
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JPEGENUMERR_ZEROY, // Y in SOFn is zero (DNL?)
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JPEGENUMERR_COMPNOTFOUND, // Scan component selector (Csj) not found among Component identifiers (Ci)
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};
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typedef short TCOEF; // 16-bit coefficients
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typedef TCOEF DU[64]; // The DATA UNIT
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typedef unsigned short TSAMP; // Lossless 'coefficients' are unsigned
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struct CABACSTATE { // borrowed from the AVC decoder
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int StateIdx;
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int valMPS;
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};
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struct COMP { // Image Component Info and variables
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// from SOF
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int Ci; // Component identifier
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int Hi; // Horizontal sampling factor
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int Vi; // Vertical sampling factor
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int Qi; // Quantization table destination selector
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// Computed parameters
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int du_w, du_h; // width/height in data units for single scans and for idct/conversion
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int du_size; // = du_w * du_h
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int du_width; // total width in DU (storage and interleaved scans)
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int du_total; // -> for malloc
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// Component coefficient buffer
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union {
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DU *du; // DCT: pointer to DU
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TSAMP *samp; // LL
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};
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// In scans
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union { // either/or
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int DC; // jpeg's differential encoded DC (per scan-component)
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int EOBRUN; // Only in AC-single scan (Huffman)
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};
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// Huffman
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int *ACB; // AC-'base-values'
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unsigned char *ACS; // AC-symbols
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int *DCB;
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unsigned char *DCS;
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// Arithmetic
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struct CABACSTATE *DCST; // DC-statistical area
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struct CABACSTATE *ACST; // with -1 offset (we use 'k' itself for addressing)
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struct CABACSTATE *LLST;
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int U, L, Kx;
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int DIFF; // diff value for the previous DC
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// Lossless
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short *diffAbove; // stored DIFF for LOSSLESS (an MCU line - 1?)
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int diffLeft[4+1]; // LineNo added (to fast test for zero)
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};
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struct JPEGD { // The JPEG DECODER OBJECT
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struct COMP Components[4];
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// SOFn: Frame Header
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int Nf;
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int P;
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int Y, X; // "number of samples per line in the component with the maximum number of horizontal samples" and vertical
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int SOF; // save marker to make decisions
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int QT[4][64]; // Q-tables from stream
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void *jpeg_mem; // <-- free me
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int Hmax, Vmax; // for conversion
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int mcu_width;
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int mcu_height;
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int mcu_total; // covers the whole image
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int HTB[2][4][16]; // Huffman 'base' values
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unsigned char HTS[2][4][256]; // Huffman 'symbol' values
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int Ri; // Restart interval
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void (*Reset_decoder)(struct JPEGD *j); // huffman/arithmetic/lossless
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// Actual Scan
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int Ns;
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struct COMP *ScanComponents[4]; // --> pointer to COMP in order of scan component definition
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int Ss, Se, Al, Ah;
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int Al2; // =1<<Al
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int ScanByte;
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int ScanBit;
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int (*Byte_in)(struct JPEGD *j); // huffman/arithmetic
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void (*DecodeDataUnit)(struct JPEGD *j, struct COMP *sc, TCOEF *coef); // DCT huffman/arithmetic
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// LOSSLESS
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int LineNo; // Ri clears this
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void (*decode_lossless)(struct JPEGD *j, struct COMP *C, int x, int y, TSAMP *coef); // huffman/arithmetic
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// Arith
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// DAC, ArithmeticConditioning
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int U[4], L[4], Kx[4];
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unsigned short C; //CodeRegister; // C <-- from bit stream
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unsigned short A; //ProbabilityIntervalRegister; // A <--
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// AVC-style (JPEG 'statictical area')
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struct CABACSTATE DCST[4][49];
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struct CABACSTATE ACST[4][245];
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};
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extern enum JPEGENUM JPEGDecode(struct JPEGD *j);
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