1ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#if !defined(_FX_JPEG_TURBO_) 2ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* 3ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * jdtrans.c 4ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * 5ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Copyright (C) 1995-1997, Thomas G. Lane. 6ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * This file is part of the Independent JPEG Group's software. 7ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * For conditions of distribution and use, see the accompanying README file. 8ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * 9ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * This file contains library routines for transcoding decompression, 10ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * that is, reading raw DCT coefficient arrays from an input JPEG file. 11ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * The routines in jdapimin.c will also be needed by a transcoder. 12ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov */ 13ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 14ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#define JPEG_INTERNALS 15ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#include "jinclude.h" 16ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#include "jpeglib.h" 17ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 18ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 19ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* Forward declarations */ 20ee451cb395940862dad63c85adfe8f2fd55e864cSvet GanovLOCAL(void) transdecode_master_selection JPP((j_decompress_ptr cinfo)); 21ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 22ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 23ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* 24ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Read the coefficient arrays from a JPEG file. 25ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * jpeg_read_header must be completed before calling this. 26ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * 27ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * The entire image is read into a set of virtual coefficient-block arrays, 28ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * one per component. The return value is a pointer to the array of 29ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * virtual-array descriptors. These can be manipulated directly via the 30ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * JPEG memory manager, or handed off to jpeg_write_coefficients(). 31ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * To release the memory occupied by the virtual arrays, call 32ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * jpeg_finish_decompress() when done with the data. 33ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * 34ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * An alternative usage is to simply obtain access to the coefficient arrays 35ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * during a buffered-image-mode decompression operation. This is allowed 36ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * after any jpeg_finish_output() call. The arrays can be accessed until 37ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * jpeg_finish_decompress() is called. (Note that any call to the library 38ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * may reposition the arrays, so don't rely on access_virt_barray() results 39ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * to stay valid across library calls.) 40ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * 41ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Returns NULL if suspended. This case need be checked only if 42ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * a suspending data source is used. 43ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov */ 44ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 45ee451cb395940862dad63c85adfe8f2fd55e864cSvet GanovGLOBAL(jvirt_barray_ptr *) 46ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovjpeg_read_coefficients (j_decompress_ptr cinfo) 47ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov{ 48ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if (cinfo->global_state == DSTATE_READY) { 49ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* First call: initialize active modules */ 50ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov transdecode_master_selection(cinfo); 51ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov cinfo->global_state = DSTATE_RDCOEFS; 52ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 53ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if (cinfo->global_state == DSTATE_RDCOEFS) { 54ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* Absorb whole file into the coef buffer */ 55ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov for (;;) { 56ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov int retcode; 57ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* Call progress monitor hook if present */ 58ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if (cinfo->progress != NULL) 59ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo); 60ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* Absorb some more input */ 61ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov retcode = (*cinfo->inputctl->consume_input) (cinfo); 62ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if (retcode == JPEG_SUSPENDED) 63ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov return NULL; 64ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if (retcode == JPEG_REACHED_EOI) 65ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov break; 66ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* Advance progress counter if appropriate */ 67ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if (cinfo->progress != NULL && 68ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) { 69ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) { 70ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* startup underestimated number of scans; ratchet up one scan */ 71ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov cinfo->progress->pass_limit += (long) cinfo->total_iMCU_rows; 72ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 73ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 74ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 75ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* Set state so that jpeg_finish_decompress does the right thing */ 76ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov cinfo->global_state = DSTATE_STOPPING; 77ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 78ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* At this point we should be in state DSTATE_STOPPING if being used 79ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * standalone, or in state DSTATE_BUFIMAGE if being invoked to get access 80ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * to the coefficients during a full buffered-image-mode decompression. 81ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov */ 82ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if ((cinfo->global_state == DSTATE_STOPPING || 83ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov cinfo->global_state == DSTATE_BUFIMAGE) && cinfo->buffered_image) { 84ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov return cinfo->coef->coef_arrays; 85ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 86ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* Oops, improper usage */ 87ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 88ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov return NULL; /* keep compiler happy */ 89ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov} 90ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 91ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 92ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* 93ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * Master selection of decompression modules for transcoding. 94ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov * This substitutes for jdmaster.c's initialization of the full decompressor. 95ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov */ 96ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 97ee451cb395940862dad63c85adfe8f2fd55e864cSvet GanovLOCAL(void) 98ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganovtransdecode_master_selection (j_decompress_ptr cinfo) 99ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov{ 100ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* This is effectively a buffered-image operation. */ 101ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov cinfo->buffered_image = TRUE; 102ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 103ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* Entropy decoding: either Huffman or arithmetic coding. */ 104ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if (cinfo->arith_code) { 105ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov ERREXIT(cinfo, JERR_ARITH_NOTIMPL); 106ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } else { 107ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if (cinfo->progressive_mode) { 108ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef D_PROGRESSIVE_SUPPORTED 109ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov jinit_phuff_decoder(cinfo); 110ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#else 111ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov ERREXIT(cinfo, JERR_NOT_COMPILED); 112ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif 113ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } else 114ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov jinit_huff_decoder(cinfo); 115ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 116ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 117ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* Always get a full-image coefficient buffer. */ 118ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov jinit_d_coef_controller(cinfo, TRUE); 119ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 120ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* We can now tell the memory manager to allocate virtual arrays. */ 121ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo); 122ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 123ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* Initialize input side of decompressor to consume first scan. */ 124ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov (*cinfo->inputctl->start_input_pass) (cinfo); 125ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 126ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* Initialize progress monitoring. */ 127ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if (cinfo->progress != NULL) { 128ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov int nscans; 129ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* Estimate number of scans to set pass_limit. */ 130ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if (cinfo->progressive_mode) { 131ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* Arbitrarily estimate 2 interleaved DC scans + 3 AC scans/component. */ 132ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov nscans = 2 + 3 * cinfo->num_components; 133ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } else if (cinfo->inputctl->has_multiple_scans) { 134ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* For a nonprogressive multiscan file, estimate 1 scan per component. */ 135ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov nscans = cinfo->num_components; 136ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } else { 137ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov nscans = 1; 138ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 139ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov cinfo->progress->pass_counter = 0L; 140ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows * nscans; 141ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov cinfo->progress->completed_passes = 0; 142ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov cinfo->progress->total_passes = 1; 143ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 144ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov} 145ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 146ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif //_FX_JPEG_TURBO_ 147