468 lines
17 KiB
C++
468 lines
17 KiB
C++
/*
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* ZoneMinder JPEG memory encoding/decoding, $Date$, $Revision$
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* Copyright (C) 2001-2008 Philip Coombes
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "zm_jpeg.h"
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#include "zm_logger.h"
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#include <unistd.h>
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/* Overridden error handlers, mostly for decompression */
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extern "C"
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{
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#define MAX_JPEG_ERRS 25
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static int jpeg_err_count = 0;
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void zm_jpeg_error_exit( j_common_ptr cinfo )
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{
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static char buffer[JMSG_LENGTH_MAX];
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zm_error_ptr zmerr = (zm_error_ptr)cinfo->err;
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(zmerr->pub.format_message)( cinfo, buffer );
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Error( "%s", buffer );
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if ( ++jpeg_err_count == MAX_JPEG_ERRS )
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{
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Fatal( "Maximum number (%d) of JPEG errors reached, exiting", jpeg_err_count );
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}
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longjmp( zmerr->setjmp_buffer, 1 );
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}
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void zm_jpeg_emit_message( j_common_ptr cinfo, int msg_level )
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{
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static char buffer[JMSG_LENGTH_MAX];
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zm_error_ptr zmerr = (zm_error_ptr)cinfo->err;
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if ( msg_level < 0 )
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{
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/* It's a warning message. Since corrupt files may generate many warnings,
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* the policy implemented here is to show only the first warning,
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* unless trace_level >= 3.
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*/
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if ( zmerr->pub.num_warnings == 0 || zmerr->pub.trace_level >= 3 )
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{
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(zmerr->pub.format_message)( cinfo, buffer );
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if (!strstr(buffer, "Corrupt JPEG data:"))
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Warning( "%s", buffer );
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}
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/* Always count warnings in num_warnings. */
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zmerr->pub.num_warnings++;
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}
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else
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{
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/* It's a trace message. Show it if trace_level >= msg_level. */
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if ( zmerr->pub.trace_level >= msg_level )
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{
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(zmerr->pub.format_message)( cinfo, buffer );
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Debug( msg_level, "%s", buffer );
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}
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}
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}
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/* Expanded data destination object for memory */
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typedef struct
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{
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struct jpeg_destination_mgr pub; /* public fields */
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JOCTET *outbuffer; /* target buffer */
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int *outbuffer_size;
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JOCTET *buffer; /* start of buffer */
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} mem_destination_mgr;
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typedef mem_destination_mgr * mem_dest_ptr;
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#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
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/*
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* Initialize destination --- called by jpeg_start_compress
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* before any data is actually written.
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*/
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static void init_destination (j_compress_ptr cinfo)
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{
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mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
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/* Allocate the output buffer --- it will be released when done with image */
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dest->buffer = (JOCTET *)(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, OUTPUT_BUF_SIZE * SIZEOF(JOCTET));
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dest->pub.next_output_byte = dest->buffer;
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dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
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*(dest->outbuffer_size) = 0;
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}
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/*
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* Empty the output buffer --- called whenever buffer fills up.
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*
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* In typical applications, this should write the entire output buffer
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* (ignoring the current state of next_output_byte & free_in_buffer),
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* reset the pointer & count to the start of the buffer, and return TRUE
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* indicating that the buffer has been dumped.
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*
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* In applications that need to be able to suspend compression due to output
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* overrun, a FALSE return indicates that the buffer cannot be emptied now.
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* In this situation, the compressor will return to its caller (possibly with
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* an indication that it has not accepted all the supplied scanlines). The
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* application should resume compression after it has made more room in the
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* output buffer. Note that there are substantial restrictions on the use of
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* suspension --- see the documentation.
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*
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* When suspending, the compressor will back up to a convenient restart point
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* (typically the start of the current MCU). next_output_byte & free_in_buffer
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* indicate where the restart point will be if the current call returns FALSE.
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* Data beyond this point will be regenerated after resumption, so do not
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* write it out when emptying the buffer externally.
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*/
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static boolean empty_output_buffer (j_compress_ptr cinfo)
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{
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mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
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memcpy( dest->outbuffer+*(dest->outbuffer_size), dest->buffer, OUTPUT_BUF_SIZE );
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*(dest->outbuffer_size) += OUTPUT_BUF_SIZE;
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dest->pub.next_output_byte = dest->buffer;
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dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
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return( TRUE );
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}
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/*
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* Terminate destination --- called by jpeg_finish_compress
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* after all data has been written. Usually needs to flush buffer.
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*
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* NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
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* application must deal with any cleanup that should happen even
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* for error exit.
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*/
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static void term_destination (j_compress_ptr cinfo)
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{
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mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
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size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
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if ( datacount > 0 )
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{
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memcpy( dest->outbuffer+*(dest->outbuffer_size), dest->buffer, datacount );
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*(dest->outbuffer_size) += datacount;
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}
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}
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/*
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* Prepare for output to a stdio stream.
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* The caller must have already opened the stream, and is responsible
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* for closing it after finishing compression.
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*/
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void zm_jpeg_mem_dest (j_compress_ptr cinfo, JOCTET *outbuffer, int *outbuffer_size )
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{
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mem_dest_ptr dest;
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/* The destination object is made permanent so that multiple JPEG images
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* can be written to the same file without re-executing jpeg_stdio_dest.
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* This makes it dangerous to use this manager and a different destination
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* manager serially with the same JPEG object, because their private object
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* sizes may be different. Caveat programmer.
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*/
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if ( cinfo->dest == NULL )
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{
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/* first time for this JPEG object? */
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cinfo->dest = (struct jpeg_destination_mgr *)(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, SIZEOF(mem_destination_mgr));
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}
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dest = (mem_dest_ptr) cinfo->dest;
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dest->pub.init_destination = init_destination;
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dest->pub.empty_output_buffer = empty_output_buffer;
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dest->pub.term_destination = term_destination;
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dest->outbuffer = outbuffer;
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dest->outbuffer_size = outbuffer_size;
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}
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/* Expanded data source object for memory input */
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typedef struct
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{
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struct jpeg_source_mgr pub; /* public fields */
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JOCTET * inbuffer; /* source stream */
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int inbuffer_size;
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int inbuffer_size_hwm; /* High water mark */
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JOCTET * buffer; /* start of buffer */
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boolean start_of_data; /* have we gotten any data yet? */
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} mem_source_mgr;
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typedef mem_source_mgr * mem_src_ptr;
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#define INPUT_BUF_SIZE 4096 /* choose an efficiently fread'able size */
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/*
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* Initialize source --- called by jpeg_read_header
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* before any data is actually read.
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*/
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static void init_source (j_decompress_ptr cinfo)
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{
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mem_src_ptr src = (mem_src_ptr) cinfo->src;
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/* We reset the empty-input-file flag for each image,
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* but we don't clear the input buffer.
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* This is correct behavior for reading a series of images from one source.
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*/
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src->start_of_data = TRUE;
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src->pub.bytes_in_buffer = 0;
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}
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/*
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* Fill the input buffer --- called whenever buffer is emptied.
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*
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* In typical applications, this should read fresh data into the buffer
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* (ignoring the current state of next_input_byte & bytes_in_buffer),
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* reset the pointer & count to the start of the buffer, and return TRUE
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* indicating that the buffer has been reloaded. It is not necessary to
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* fill the buffer entirely, only to obtain at least one more byte.
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*
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* There is no such thing as an EOF return. If the end of the file has been
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* reached, the routine has a choice of ERREXIT() or inserting fake data into
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* the buffer. In most cases, generating a warning message and inserting a
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* fake EOI marker is the best course of action --- this will allow the
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* decompressor to output however much of the image is there. However,
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* the resulting error message is misleading if the real problem is an empty
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* input file, so we handle that case specially.
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*
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* In applications that need to be able to suspend compression due to input
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* not being available yet, a FALSE return indicates that no more data can be
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* obtained right now, but more may be forthcoming later. In this situation,
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* the decompressor will return to its caller (with an indication of the
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* number of scanlines it has read, if any). The application should resume
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* decompression after it has loaded more data into the input buffer. Note
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* that there are substantial restrictions on the use of suspension --- see
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* the documentation.
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*
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* When suspending, the decompressor will back up to a convenient restart point
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* (typically the start of the current MCU). next_input_byte & bytes_in_buffer
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* indicate where the restart point will be if the current call returns FALSE.
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* Data beyond this point must be rescanned after resumption, so move it to
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* the front of the buffer rather than discarding it.
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*/
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static boolean fill_input_buffer (j_decompress_ptr cinfo)
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{
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mem_src_ptr src = (mem_src_ptr) cinfo->src;
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size_t nbytes;
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memcpy( src->buffer, src->inbuffer, (size_t) src->inbuffer_size );
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nbytes = src->inbuffer_size;
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if ( nbytes <= 0 )
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{
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if ( src->start_of_data ) /* Treat empty input file as fatal error */
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ERREXIT(cinfo, JERR_INPUT_EMPTY);
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WARNMS(cinfo, JWRN_JPEG_EOF);
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/* Insert a fake EOI marker */
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src->buffer[0] = (JOCTET) 0xFF;
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src->buffer[1] = (JOCTET) JPEG_EOI;
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nbytes = 2;
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}
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src->pub.next_input_byte = src->buffer;
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src->pub.bytes_in_buffer = nbytes;
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src->start_of_data = FALSE;
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return( TRUE );
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}
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/*
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* Skip data --- used to skip over a potentially large amount of
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* uninteresting data (such as an APPn marker).
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*
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* Writers of suspendable-input applications must note that skip_input_data
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* is not granted the right to give a suspension return. If the skip extends
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* beyond the data currently in the buffer, the buffer can be marked empty so
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* that the next read will cause a fill_input_buffer call that can suspend.
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* Arranging for additional bytes to be discarded before reloading the input
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* buffer is the application writer's problem.
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*/
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static void skip_input_data (j_decompress_ptr cinfo, long num_bytes)
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{
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mem_src_ptr src = (mem_src_ptr) cinfo->src;
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/* Just a dumb implementation for now. Could use fseek() except
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* it doesn't work on pipes. Not clear that being smart is worth
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* any trouble anyway --- large skips are infrequent.
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*/
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if ( num_bytes > 0 )
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{
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while ( num_bytes > (long) src->pub.bytes_in_buffer )
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{
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num_bytes -= (long) src->pub.bytes_in_buffer;
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(void) fill_input_buffer(cinfo);
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/* note we assume that fill_input_buffer will never return FALSE,
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* so suspension need not be handled.
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*/
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}
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src->pub.next_input_byte += (size_t) num_bytes;
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src->pub.bytes_in_buffer -= (size_t) num_bytes;
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}
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}
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/*
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* Terminate source --- called by jpeg_finish_decompress
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* after all data has been read. Often a no-op.
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*
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* NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
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* application must deal with any cleanup that should happen even
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* for error exit.
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*/
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static void term_source (j_decompress_ptr cinfo)
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{
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/* no work necessary here */
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}
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/*
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* Prepare for input from a memory stream.
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* The caller must have already opened the stream, and is responsible
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* for closing it after finishing decompression.
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*/
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void zm_jpeg_mem_src( j_decompress_ptr cinfo, const JOCTET *inbuffer, int inbuffer_size )
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{
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mem_src_ptr src;
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/* The source object and input buffer are made permanent so that a series
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* of JPEG images can be read from the same file by calling zm_jpeg_mem_src
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* only before the first one. (If we discarded the buffer at the end of
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* one image, we'd likely lose the start of the next one.)
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* This makes it unsafe to use this manager and a different source
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* manager serially with the same JPEG object. Caveat programmer.
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*/
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if ( cinfo->src == NULL )
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{
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/* first time for this JPEG object? */
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cinfo->src = (struct jpeg_source_mgr *)(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, SIZEOF(mem_source_mgr));
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src = (mem_src_ptr) cinfo->src;
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src->buffer = (JOCTET *)(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, inbuffer_size * SIZEOF(JOCTET));
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src->inbuffer_size_hwm = inbuffer_size;
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}
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else
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{
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src = (mem_src_ptr) cinfo->src;
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if ( src->inbuffer_size_hwm < inbuffer_size )
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{
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src->buffer = (JOCTET *)(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, inbuffer_size * SIZEOF(JOCTET));
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src->inbuffer_size_hwm = inbuffer_size;
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}
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}
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src = (mem_src_ptr) cinfo->src;
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src->pub.init_source = init_source;
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src->pub.fill_input_buffer = fill_input_buffer;
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src->pub.skip_input_data = skip_input_data;
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src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
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src->pub.term_source = term_source;
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src->inbuffer = (JOCTET *)inbuffer;
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src->inbuffer_size = inbuffer_size;
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src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
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src->pub.next_input_byte = NULL; /* until buffer loaded */
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}
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void zm_use_std_huff_tables( j_decompress_ptr cinfo ) {
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/* JPEG standard Huffman tables (cf. JPEG standard section K.3) */
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/* IMPORTANT: these are only valid for 8-bit data precision! */
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static const JHUFF_TBL dclumin = {
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{ /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 },
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 },
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FALSE
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};
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static const JHUFF_TBL dcchrome = {
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{ /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 },
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 },
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FALSE
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};
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static const JHUFF_TBL aclumin = {
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{ /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d },
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{ 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
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0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
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0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
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0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
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0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
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0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
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0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
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0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
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0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
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0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
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0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
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0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
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0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
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0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
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0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
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0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
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0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
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0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
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0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
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0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa },
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FALSE
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};
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static const JHUFF_TBL acchrome = {
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{ /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 },
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{ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
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0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
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0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
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0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
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0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
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0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
|
|
0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
|
|
0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
|
|
0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
|
|
0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
|
|
0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
|
|
0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
|
|
0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
|
|
0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
|
|
0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
|
|
0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
|
|
0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
|
|
0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
|
|
0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
|
|
0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
|
|
0xf9, 0xfa },
|
|
FALSE
|
|
};
|
|
|
|
cinfo->dc_huff_tbl_ptrs[0] = (JHUFF_TBL*)&dclumin;
|
|
cinfo->dc_huff_tbl_ptrs[1] = (JHUFF_TBL*)&dcchrome;
|
|
cinfo->ac_huff_tbl_ptrs[0] = (JHUFF_TBL*)&aclumin;
|
|
cinfo->ac_huff_tbl_ptrs[1] = (JHUFF_TBL*)&acchrome;
|
|
|
|
}
|
|
|
|
}
|