320 lines
13 KiB
C
320 lines
13 KiB
C
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// jpgd.h - C++ class for JPEG decompression.
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// Public domain, Rich Geldreich <richgel99@gmail.com>
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#ifndef JPEG_DECODER_H
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#define JPEG_DECODER_H
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#include <stdlib.h>
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#include <stdio.h>
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#include <setjmp.h>
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#ifdef _MSC_VER
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#define JPGD_NORETURN __declspec(noreturn)
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#elif defined(__GNUC__)
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#define JPGD_NORETURN __attribute__ ((noreturn))
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#else
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#define JPGD_NORETURN
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#endif
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namespace jpgd
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{
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typedef unsigned char uint8;
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typedef signed short int16;
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typedef unsigned short uint16;
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typedef unsigned int uint;
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typedef signed int int32;
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// Loads a JPEG image from a memory buffer or a file.
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// req_comps can be 1 (grayscale), 3 (RGB), or 4 (RGBA).
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// On return, width/height will be set to the image's dimensions, and actual_comps will be set to the either 1 (grayscale) or 3 (RGB).
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// Notes: For more control over where and how the source data is read, see the decompress_jpeg_image_from_stream() function below, or call the jpeg_decoder class directly.
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// Requesting a 8 or 32bpp image is currently a little faster than 24bpp because the jpeg_decoder class itself currently always unpacks to either 8 or 32bpp.
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unsigned char *decompress_jpeg_image_from_memory(const unsigned char *pSrc_data, int src_data_size, int *width, int *height, int *actual_comps, int req_comps);
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unsigned char *decompress_jpeg_image_from_file(const char *pSrc_filename, int *width, int *height, int *actual_comps, int req_comps);
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// Success/failure error codes.
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enum jpgd_status
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{
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JPGD_SUCCESS = 0, JPGD_FAILED = -1, JPGD_DONE = 1,
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JPGD_BAD_DHT_COUNTS = -256, JPGD_BAD_DHT_INDEX, JPGD_BAD_DHT_MARKER, JPGD_BAD_DQT_MARKER, JPGD_BAD_DQT_TABLE,
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JPGD_BAD_PRECISION, JPGD_BAD_HEIGHT, JPGD_BAD_WIDTH, JPGD_TOO_MANY_COMPONENTS,
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JPGD_BAD_SOF_LENGTH, JPGD_BAD_VARIABLE_MARKER, JPGD_BAD_DRI_LENGTH, JPGD_BAD_SOS_LENGTH,
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JPGD_BAD_SOS_COMP_ID, JPGD_W_EXTRA_BYTES_BEFORE_MARKER, JPGD_NO_ARITHMITIC_SUPPORT, JPGD_UNEXPECTED_MARKER,
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JPGD_NOT_JPEG, JPGD_UNSUPPORTED_MARKER, JPGD_BAD_DQT_LENGTH, JPGD_TOO_MANY_BLOCKS,
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JPGD_UNDEFINED_QUANT_TABLE, JPGD_UNDEFINED_HUFF_TABLE, JPGD_NOT_SINGLE_SCAN, JPGD_UNSUPPORTED_COLORSPACE,
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JPGD_UNSUPPORTED_SAMP_FACTORS, JPGD_DECODE_ERROR, JPGD_BAD_RESTART_MARKER, JPGD_ASSERTION_ERROR,
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JPGD_BAD_SOS_SPECTRAL, JPGD_BAD_SOS_SUCCESSIVE, JPGD_STREAM_READ, JPGD_NOTENOUGHMEM
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};
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// Input stream interface.
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// Derive from this class to read input data from sources other than files or memory. Set m_eof_flag to true when no more data is available.
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// The decoder is rather greedy: it will keep on calling this method until its internal input buffer is full, or until the EOF flag is set.
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// It the input stream contains data after the JPEG stream's EOI (end of image) marker it will probably be pulled into the internal buffer.
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// Call the get_total_bytes_read() method to determine the actual size of the JPEG stream after successful decoding.
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class jpeg_decoder_stream
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{
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public:
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jpeg_decoder_stream() { }
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virtual ~jpeg_decoder_stream() { }
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// The read() method is called when the internal input buffer is empty.
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// Parameters:
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// pBuf - input buffer
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// max_bytes_to_read - maximum bytes that can be written to pBuf
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// pEOF_flag - set this to true if at end of stream (no more bytes remaining)
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// Returns -1 on error, otherwise return the number of bytes actually written to the buffer (which may be 0).
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// Notes: This method will be called in a loop until you set *pEOF_flag to true or the internal buffer is full.
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virtual int read(uint8 *pBuf, int max_bytes_to_read, bool *pEOF_flag) = 0;
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};
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// stdio FILE stream class.
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class jpeg_decoder_file_stream : public jpeg_decoder_stream
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{
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jpeg_decoder_file_stream(const jpeg_decoder_file_stream &);
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jpeg_decoder_file_stream &operator =(const jpeg_decoder_file_stream &);
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FILE *m_pFile;
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bool m_eof_flag, m_error_flag;
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public:
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jpeg_decoder_file_stream();
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virtual ~jpeg_decoder_file_stream();
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bool open(const char *Pfilename);
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void close();
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virtual int read(uint8 *pBuf, int max_bytes_to_read, bool *pEOF_flag);
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};
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// Memory stream class.
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class jpeg_decoder_mem_stream : public jpeg_decoder_stream
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{
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const uint8 *m_pSrc_data;
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uint m_ofs, m_size;
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public:
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jpeg_decoder_mem_stream() : m_pSrc_data(NULL), m_ofs(0), m_size(0) { }
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jpeg_decoder_mem_stream(const uint8 *pSrc_data, uint size) : m_pSrc_data(pSrc_data), m_ofs(0), m_size(size) { }
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virtual ~jpeg_decoder_mem_stream() { }
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bool open(const uint8 *pSrc_data, uint size);
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void close() { m_pSrc_data = NULL; m_ofs = 0; m_size = 0; }
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virtual int read(uint8 *pBuf, int max_bytes_to_read, bool *pEOF_flag);
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};
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// Loads JPEG file from a jpeg_decoder_stream.
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unsigned char *decompress_jpeg_image_from_stream(jpeg_decoder_stream *pStream, int *width, int *height, int *actual_comps, int req_comps);
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enum
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{
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JPGD_IN_BUF_SIZE = 8192, JPGD_MAX_BLOCKS_PER_MCU = 10, JPGD_MAX_HUFF_TABLES = 8, JPGD_MAX_QUANT_TABLES = 4,
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JPGD_MAX_COMPONENTS = 4, JPGD_MAX_COMPS_IN_SCAN = 4, JPGD_MAX_BLOCKS_PER_ROW = 8192, JPGD_MAX_HEIGHT = 16384, JPGD_MAX_WIDTH = 16384
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};
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typedef int16 jpgd_quant_t;
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typedef int16 jpgd_block_t;
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class jpeg_decoder
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{
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public:
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// Call get_error_code() after constructing to determine if the stream is valid or not. You may call the get_width(), get_height(), etc.
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// methods after the constructor is called. You may then either destruct the object, or begin decoding the image by calling begin_decoding(), then decode() on each scanline.
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jpeg_decoder(jpeg_decoder_stream *pStream);
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~jpeg_decoder();
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// Call this method after constructing the object to begin decompression.
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// If JPGD_SUCCESS is returned you may then call decode() on each scanline.
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int begin_decoding();
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// Returns the next scan line.
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// For grayscale images, pScan_line will point to a buffer containing 8-bit pixels (get_bytes_per_pixel() will return 1).
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// Otherwise, it will always point to a buffer containing 32-bit RGBA pixels (A will always be 255, and get_bytes_per_pixel() will return 4).
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// Returns JPGD_SUCCESS if a scan line has been returned.
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// Returns JPGD_DONE if all scan lines have been returned.
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// Returns JPGD_FAILED if an error occurred. Call get_error_code() for a more info.
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int decode(const void** pScan_line, uint* pScan_line_len);
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inline jpgd_status get_error_code() const { return m_error_code; }
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inline int get_width() const { return m_image_x_size; }
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inline int get_height() const { return m_image_y_size; }
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inline int get_num_components() const { return m_comps_in_frame; }
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inline int get_bytes_per_pixel() const { return m_dest_bytes_per_pixel; }
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inline int get_bytes_per_scan_line() const { return m_image_x_size * get_bytes_per_pixel(); }
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// Returns the total number of bytes actually consumed by the decoder (which should equal the actual size of the JPEG file).
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inline int get_total_bytes_read() const { return m_total_bytes_read; }
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private:
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jpeg_decoder(const jpeg_decoder &);
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jpeg_decoder &operator =(const jpeg_decoder &);
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typedef void (*pDecode_block_func)(jpeg_decoder *, int, int, int);
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struct huff_tables
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{
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bool ac_table;
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uint look_up[256];
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uint look_up2[256];
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uint8 code_size[256];
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uint tree[512];
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};
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struct coeff_buf
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{
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uint8 *pData;
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int block_num_x, block_num_y;
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int block_len_x, block_len_y;
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int block_size;
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};
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struct mem_block
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{
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mem_block *m_pNext;
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size_t m_used_count;
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size_t m_size;
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char m_data[1];
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};
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jmp_buf m_jmp_state;
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mem_block *m_pMem_blocks;
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int m_image_x_size;
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int m_image_y_size;
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jpeg_decoder_stream *m_pStream;
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int m_progressive_flag;
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uint8 m_huff_ac[JPGD_MAX_HUFF_TABLES];
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uint8* m_huff_num[JPGD_MAX_HUFF_TABLES]; // pointer to number of Huffman codes per bit size
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uint8* m_huff_val[JPGD_MAX_HUFF_TABLES]; // pointer to Huffman codes per bit size
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jpgd_quant_t* m_quant[JPGD_MAX_QUANT_TABLES]; // pointer to quantization tables
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int m_scan_type; // Gray, Yh1v1, Yh1v2, Yh2v1, Yh2v2 (CMYK111, CMYK4114 no longer supported)
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int m_comps_in_frame; // # of components in frame
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int m_comp_h_samp[JPGD_MAX_COMPONENTS]; // component's horizontal sampling factor
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int m_comp_v_samp[JPGD_MAX_COMPONENTS]; // component's vertical sampling factor
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int m_comp_quant[JPGD_MAX_COMPONENTS]; // component's quantization table selector
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int m_comp_ident[JPGD_MAX_COMPONENTS]; // component's ID
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int m_comp_h_blocks[JPGD_MAX_COMPONENTS];
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int m_comp_v_blocks[JPGD_MAX_COMPONENTS];
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int m_comps_in_scan; // # of components in scan
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int m_comp_list[JPGD_MAX_COMPS_IN_SCAN]; // components in this scan
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int m_comp_dc_tab[JPGD_MAX_COMPONENTS]; // component's DC Huffman coding table selector
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int m_comp_ac_tab[JPGD_MAX_COMPONENTS]; // component's AC Huffman coding table selector
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int m_spectral_start; // spectral selection start
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int m_spectral_end; // spectral selection end
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int m_successive_low; // successive approximation low
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int m_successive_high; // successive approximation high
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int m_max_mcu_x_size; // MCU's max. X size in pixels
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int m_max_mcu_y_size; // MCU's max. Y size in pixels
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int m_blocks_per_mcu;
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int m_max_blocks_per_row;
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int m_mcus_per_row, m_mcus_per_col;
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int m_mcu_org[JPGD_MAX_BLOCKS_PER_MCU];
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int m_total_lines_left; // total # lines left in image
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int m_mcu_lines_left; // total # lines left in this MCU
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int m_real_dest_bytes_per_scan_line;
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int m_dest_bytes_per_scan_line; // rounded up
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int m_dest_bytes_per_pixel; // 4 (RGB) or 1 (Y)
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huff_tables* m_pHuff_tabs[JPGD_MAX_HUFF_TABLES];
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coeff_buf* m_dc_coeffs[JPGD_MAX_COMPONENTS];
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coeff_buf* m_ac_coeffs[JPGD_MAX_COMPONENTS];
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int m_eob_run;
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int m_block_y_mcu[JPGD_MAX_COMPONENTS];
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uint8* m_pIn_buf_ofs;
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int m_in_buf_left;
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int m_tem_flag;
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bool m_eof_flag;
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uint8 m_in_buf_pad_start[128];
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uint8 m_in_buf[JPGD_IN_BUF_SIZE + 128];
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uint8 m_in_buf_pad_end[128];
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int m_bits_left;
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uint m_bit_buf;
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int m_restart_interval;
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int m_restarts_left;
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int m_next_restart_num;
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int m_max_mcus_per_row;
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int m_max_blocks_per_mcu;
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int m_expanded_blocks_per_mcu;
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int m_expanded_blocks_per_row;
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int m_expanded_blocks_per_component;
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bool m_freq_domain_chroma_upsample;
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int m_max_mcus_per_col;
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uint m_last_dc_val[JPGD_MAX_COMPONENTS];
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jpgd_block_t* m_pMCU_coefficients;
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int m_mcu_block_max_zag[JPGD_MAX_BLOCKS_PER_MCU];
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uint8* m_pSample_buf;
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int m_crr[256];
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int m_cbb[256];
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int m_crg[256];
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int m_cbg[256];
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uint8* m_pScan_line_0;
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uint8* m_pScan_line_1;
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jpgd_status m_error_code;
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bool m_ready_flag;
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int m_total_bytes_read;
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void free_all_blocks();
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JPGD_NORETURN void stop_decoding(jpgd_status status);
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void *alloc(size_t n, bool zero = false);
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void word_clear(void *p, uint16 c, uint n);
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void prep_in_buffer();
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void read_dht_marker();
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void read_dqt_marker();
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void read_sof_marker();
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void skip_variable_marker();
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void read_dri_marker();
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void read_sos_marker();
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int next_marker();
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int process_markers();
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void locate_soi_marker();
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void locate_sof_marker();
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int locate_sos_marker();
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void init(jpeg_decoder_stream * pStream);
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void create_look_ups();
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void fix_in_buffer();
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void transform_mcu(int mcu_row);
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void transform_mcu_expand(int mcu_row);
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coeff_buf* coeff_buf_open(int block_num_x, int block_num_y, int block_len_x, int block_len_y);
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inline jpgd_block_t *coeff_buf_getp(coeff_buf *cb, int block_x, int block_y);
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void load_next_row();
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void decode_next_row();
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void make_huff_table(int index, huff_tables *pH);
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void check_quant_tables();
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void check_huff_tables();
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void calc_mcu_block_order();
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int init_scan();
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void init_frame();
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void process_restart();
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void decode_scan(pDecode_block_func decode_block_func);
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void init_progressive();
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void init_sequential();
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void decode_start();
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void decode_init(jpeg_decoder_stream * pStream);
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void H2V2Convert();
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void H2V1Convert();
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void H1V2Convert();
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void H1V1Convert();
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void gray_convert();
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void expanded_convert();
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void find_eoi();
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inline uint get_char();
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inline uint get_char(bool *pPadding_flag);
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inline void stuff_char(uint8 q);
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inline uint8 get_octet();
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inline uint get_bits(int num_bits);
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inline uint get_bits_no_markers(int numbits);
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inline int huff_decode(huff_tables *pH);
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inline int huff_decode(huff_tables *pH, int& extrabits);
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static inline uint8 clamp(int i);
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static void decode_block_dc_first(jpeg_decoder *pD, int component_id, int block_x, int block_y);
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static void decode_block_dc_refine(jpeg_decoder *pD, int component_id, int block_x, int block_y);
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static void decode_block_ac_first(jpeg_decoder *pD, int component_id, int block_x, int block_y);
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static void decode_block_ac_refine(jpeg_decoder *pD, int component_id, int block_x, int block_y);
|
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};
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} // namespace jpgd
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#endif // JPEG_DECODER_H
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