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