170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jdtrans.c 370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Copyright (C) 1995-1997, Thomas G. Lane. 570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This file is part of the Independent JPEG Group's software. 670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * For conditions of distribution and use, see the accompanying README file. 770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This file contains library routines for transcoding decompression, 970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * that is, reading raw DCT coefficient arrays from an input JPEG file. 1070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The routines in jdapimin.c will also be needed by a transcoder. 1170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 1270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 1370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define JPEG_INTERNALS 1470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jinclude.h" 1570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jpeglib.h" 1670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 1770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 1870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Forward declarations */ 1970a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) transdecode_master_selection JPP((j_decompress_ptr cinfo)); 2070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 2370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Read the coefficient arrays from a JPEG file. 2470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jpeg_read_header must be completed before calling this. 2570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 2670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The entire image is read into a set of virtual coefficient-block arrays, 2770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * one per component. The return value is a pointer to the array of 2870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * virtual-array descriptors. These can be manipulated directly via the 2970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * JPEG memory manager, or handed off to jpeg_write_coefficients(). 3070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * To release the memory occupied by the virtual arrays, call 3170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jpeg_finish_decompress() when done with the data. 3270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 3370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * An alternative usage is to simply obtain access to the coefficient arrays 3470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * during a buffered-image-mode decompression operation. This is allowed 3570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * after any jpeg_finish_output() call. The arrays can be accessed until 3670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jpeg_finish_decompress() is called. (Note that any call to the library 3770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * may reposition the arrays, so don't rely on access_virt_barray() results 3870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * to stay valid across library calls.) 3970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 4070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Returns NULL if suspended. This case need be checked only if 4170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * a suspending data source is used. 4270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 4370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 4470a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(jvirt_barray_ptr *) 4570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_read_coefficients (j_decompress_ptr cinfo) 4670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 4770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->global_state == DSTATE_READY) { 4870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* First call: initialize active modules */ 4970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine transdecode_master_selection(cinfo); 5070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->global_state = DSTATE_RDCOEFS; 5170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 5270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->global_state == DSTATE_RDCOEFS) { 5370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Absorb whole file into the coef buffer */ 5470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (;;) { 5570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int retcode; 5670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Call progress monitor hook if present */ 5770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->progress != NULL) 5870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo); 5970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Absorb some more input */ 6070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine retcode = (*cinfo->inputctl->consume_input) (cinfo); 6170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (retcode == JPEG_SUSPENDED) 6270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return NULL; 6370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (retcode == JPEG_REACHED_EOI) 6470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine break; 6570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Advance progress counter if appropriate */ 6670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->progress != NULL && 6770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) { 6870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) { 6970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* startup underestimated number of scans; ratchet up one scan */ 7070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->progress->pass_limit += (long) cinfo->total_iMCU_rows; 7170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 7270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 7370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 7470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Set state so that jpeg_finish_decompress does the right thing */ 7570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->global_state = DSTATE_STOPPING; 7670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 7770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* At this point we should be in state DSTATE_STOPPING if being used 7870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * standalone, or in state DSTATE_BUFIMAGE if being invoked to get access 7970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * to the coefficients during a full buffered-image-mode decompression. 8070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 8170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ((cinfo->global_state == DSTATE_STOPPING || 8270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->global_state == DSTATE_BUFIMAGE) && cinfo->buffered_image) { 8370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return cinfo->coef->coef_arrays; 8470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 8570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Oops, improper usage */ 8670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 8770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return NULL; /* keep compiler happy */ 8870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 8970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 9070a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(boolean) 9170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_build_huffman_index_progressive(j_decompress_ptr cinfo, 9270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine huffman_index *index) 9370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 9470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->global_state == DSTATE_READY) { 9570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine printf("Progressive Mode\n"); 9670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* First call: initialize active modules */ 9770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine transdecode_master_selection(cinfo); 9870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->global_state = DSTATE_RDCOEFS; 9970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 10070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->global_state == DSTATE_RDCOEFS) { 10170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int mcu, i; 10270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->marker->get_sos_marker_position(cinfo, index); 10370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 10470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Absorb whole file into the coef buffer */ 10570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (mcu = 0; mcu < cinfo->total_iMCU_rows; mcu++) { 10670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int retcode = 0; 10770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Call progress monitor hook if present */ 10870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->progress != NULL) 10970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo); 11070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Absorb some more input */ 11170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jinit_phuff_decoder(cinfo); 11270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (i = 0; i < index->scan_count; i++) { 11370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->inputctl->finish_input_pass) (cinfo); 11470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jset_input_stream_position(cinfo, index->scan[i].bitstream_offset); 11570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->unread_marker = 0; 11670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine retcode = (*cinfo->inputctl->consume_input_build_huffman_index) 11770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (cinfo, index, i); 11870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (retcode == JPEG_REACHED_EOI) 11970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine break; 12070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->input_iMCU_row = mcu; 12170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (mcu != 0) 12270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->entropy->configure_huffman_decoder) 12370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (cinfo, index->scan[i].prev_MCU_offset); 12470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->input_scan_number = i; 12570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine retcode = (*cinfo->inputctl->consume_input_build_huffman_index) 12670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (cinfo, index, i); 12770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 12870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (retcode == JPEG_SUSPENDED) 12970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return FALSE; 13070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (retcode == JPEG_REACHED_EOI) 13170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine break; 13270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Advance progress counter if appropriate */ 13370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->progress != NULL && 13470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) { 13570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) { 13670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* startup underestimated number of scans; ratchet up one scan */ 13770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->progress->pass_limit += (long) cinfo->total_iMCU_rows; 13870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 13970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 14070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 14170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->global_state = DSTATE_STOPPING; 14270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 14370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* At this point we should be in state DSTATE_STOPPING if being used 14470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * standalone, or in state DSTATE_BUFIMAGE if being invoked to get access 14570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * to the coefficients during a full buffered-image-mode decompression. 14670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 14770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ((cinfo->global_state == DSTATE_STOPPING || 14870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->global_state == DSTATE_BUFIMAGE) && cinfo->buffered_image) { 14970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return TRUE; 15070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 15170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Oops, improper usage */ 15270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 15370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return FALSE; /* keep compiler happy */ 15470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 15570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 15670a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(boolean) 15770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_build_huffman_index_baseline(j_decompress_ptr cinfo, huffman_index *index) 15870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 15970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->global_state == DSTATE_READY) { 16070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine printf("Baseline Mode\n"); 16170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* First call: initialize active modules */ 16270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine transdecode_master_selection(cinfo); 16370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->global_state = DSTATE_RDCOEFS; 16470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 16570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->global_state == DSTATE_RDCOEFS) { 16670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Absorb whole file into the coef buffer */ 16770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (;;) { 16870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int retcode; 16970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Call progress monitor hook if present */ 17070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->progress != NULL) 17170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo); 17270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Absorb some more input */ 17370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine retcode = (*cinfo->inputctl->consume_input_build_huffman_index) 17470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (cinfo, index, 0); 17570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (retcode == JPEG_SUSPENDED) 17670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return FALSE; 17770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (retcode == JPEG_REACHED_EOI) 17870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine break; 17970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (retcode == JPEG_SCAN_COMPLETED) 18070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine break; 18170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 18270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Advance progress counter if appropriate */ 18370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->progress != NULL && 18470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) { 18570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) { 18670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* startup underestimated number of scans; ratchet up one scan */ 18770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->progress->pass_limit += (long) cinfo->total_iMCU_rows; 18870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 18970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 19070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 19170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Set state so that jpeg_finish_decompress does the right thing */ 19270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->global_state = DSTATE_STOPPING; 19370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 19470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* At this point we should be in state DSTATE_STOPPING if being used 19570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * standalone, or in state DSTATE_BUFIMAGE if being invoked to get access 19670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * to the coefficients during a full buffered-image-mode decompression. 19770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 19870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ((cinfo->global_state == DSTATE_STOPPING || 19970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->global_state == DSTATE_BUFIMAGE) && cinfo->buffered_image) { 20070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return TRUE; 20170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 20270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Oops, improper usage */ 20370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 20470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return FALSE; /* keep compiler happy */ 20570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 20670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 20770a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(boolean) 20870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_build_huffman_index(j_decompress_ptr cinfo, huffman_index *index) 20970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 21070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->tile_decode = TRUE; 21170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->progressive_mode) 21270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return jpeg_build_huffman_index_progressive(cinfo, index); 21370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine else 21470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return jpeg_build_huffman_index_baseline(cinfo, index); 21570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 21670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 21870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Master selection of decompression modules for transcoding. 21970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This substitutes for jdmaster.c's initialization of the full decompressor. 22070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 22170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 22270a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 22370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinetransdecode_master_selection (j_decompress_ptr cinfo) 22470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 22570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* This is effectively a buffered-image operation. */ 22670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->buffered_image = TRUE; 22770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 22870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Entropy decoding: either Huffman or arithmetic coding. */ 22970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->arith_code) { 23070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_ARITH_NOTIMPL); 23170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 23270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->progressive_mode) { 23370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#ifdef D_PROGRESSIVE_SUPPORTED 23470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jinit_phuff_decoder(cinfo); 23570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#else 23670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_NOT_COMPILED); 23770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#endif 23870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 23970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jinit_huff_decoder(cinfo); 24070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 24170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 24270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Always get a full-image coefficient buffer. */ 24470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jinit_d_coef_controller(cinfo, TRUE); 24570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* We can now tell the memory manager to allocate virtual arrays. */ 24770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo); 24870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Initialize input side of decompressor to consume first scan. */ 25070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->inputctl->start_input_pass) (cinfo); 25170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 25270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Initialize progress monitoring. */ 25370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->progress != NULL) { 25470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int nscans; 25570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Estimate number of scans to set pass_limit. */ 25670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->progressive_mode) { 25770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Arbitrarily estimate 2 interleaved DC scans + 3 AC scans/component. */ 25870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine nscans = 2 + 3 * cinfo->num_components; 25970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else if (cinfo->inputctl->has_multiple_scans) { 26070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* For a nonprogressive multiscan file, estimate 1 scan per component. */ 26170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine nscans = cinfo->num_components; 26270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 26370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine nscans = 1; 26470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 26570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->progress->pass_counter = 0L; 26670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows * nscans; 26770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->progress->completed_passes = 0; 26870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->progress->total_passes = 1; 26970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 27070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 271