src/zm_jpeg.cpp
Rama master · réplica de lectura del repositorio original.
/*
* ZoneMinder JPEG memory encoding/decoding, $Date$, $Revision$
* Copyright (C) 2001-2008 Philip Coombes
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "zm_jpeg.h"
#include "zm_logger.h"
/* Overridden error handlers, mostly for decompression */
extern "C" {
#define MAX_JPEG_ERRS 25
#define MAX_JPEG_ERR_MULT 10 /* ratio of acceptable frame errors without a fatal error */
static int jpeg_err_count = 0;
void zm_jpeg_error_silent(j_common_ptr cinfo) {
zm_error_ptr zmerr = (zm_error_ptr)cinfo->err;
longjmp(zmerr->setjmp_buffer, 1);
}
void zm_jpeg_emit_silence(j_common_ptr cinfo, int msg_level) {
}
void zm_jpeg_error_exit(j_common_ptr cinfo) {
zm_error_ptr zmerr = (zm_error_ptr) cinfo->err;
char buffer[JMSG_LENGTH_MAX];
zmerr->pub.format_message(cinfo, buffer);
Error("%s", buffer);
jpeg_err_count += MAX_JPEG_ERR_MULT;
if (jpeg_err_count >= ( MAX_JPEG_ERRS * MAX_JPEG_ERR_MULT )) {
Fatal("Maximum number (%d) of JPEG errors reached, exiting", jpeg_err_count / MAX_JPEG_ERR_MULT);
}
longjmp(zmerr->setjmp_buffer, 1);
}
void zm_jpeg_emit_message(j_common_ptr cinfo, int msg_level) {
char buffer[JMSG_LENGTH_MAX];
zm_error_ptr zmerr = (zm_error_ptr) cinfo->err;
if (msg_level < 0) {
/* It's a warning message. Since corrupt files may generate many warnings,
* the policy implemented here is to show only the first warning,
* unless trace_level >= 3.
*/
if (zmerr->pub.num_warnings == 0 || zmerr->pub.trace_level >= 3) {
zmerr->pub.format_message(cinfo, buffer);
if (!strstr(buffer, "Corrupt JPEG data:"))
Warning("%s", buffer);
}
/* Always count warnings in num_warnings. */
zmerr->pub.num_warnings++;
} else {
/* It's a trace message. Show it if trace_level >= msg_level. */
if (zmerr->pub.trace_level >= msg_level) {
zmerr->pub.format_message(cinfo, buffer);
Debug(msg_level, "%s", buffer);
}
}
}
/* Expanded data destination object for memory */
typedef struct {
struct jpeg_destination_mgr pub; /* public fields */
JOCTET *outbuffer; /* target buffer */
size_t *outbuffer_size;
JOCTET *buffer; /* start of buffer */
} mem_destination_mgr;
typedef mem_destination_mgr * mem_dest_ptr;
#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
/*
* Initialize destination --- called by jpeg_start_compress
* before any data is actually written.
*/
static void init_destination (j_compress_ptr cinfo) {
mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
/* Allocate the output buffer --- it will be released when done with image */
dest->buffer = (JOCTET *)(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, OUTPUT_BUF_SIZE * SIZEOF(JOCTET));
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
*(dest->outbuffer_size) = 0;
}
/*
* Empty the output buffer --- called whenever buffer fills up.
*
* In typical applications, this should write the entire output buffer
* (ignoring the current state of next_output_byte & free_in_buffer),
* reset the pointer & count to the start of the buffer, and return TRUE
* indicating that the buffer has been dumped.
*
* In applications that need to be able to suspend compression due to output
* overrun, a FALSE return indicates that the buffer cannot be emptied now.
* In this situation, the compressor will return to its caller (possibly with
* an indication that it has not accepted all the supplied scanlines). The
* application should resume compression after it has made more room in the
* output buffer. Note that there are substantial restrictions on the use of
* suspension --- see the documentation.
*
* When suspending, the compressor will back up to a convenient restart point
* (typically the start of the current MCU). next_output_byte & free_in_buffer
* indicate where the restart point will be if the current call returns FALSE.
* Data beyond this point will be regenerated after resumption, so do not
* write it out when emptying the buffer externally.
*/
static boolean empty_output_buffer(j_compress_ptr cinfo) {
mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
memcpy(dest->outbuffer+*(dest->outbuffer_size), dest->buffer, OUTPUT_BUF_SIZE);
*(dest->outbuffer_size) += OUTPUT_BUF_SIZE;
dest->pub.next_output_byte = dest->buffer;
dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
return TRUE;
}
/*
* Terminate destination --- called by jpeg_finish_compress
* after all data has been written. Usually needs to flush buffer.
*
* NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
* application must deal with any cleanup that should happen even
* for error exit.
*/
static void term_destination(j_compress_ptr cinfo) {
mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
if ( datacount > 0 ) {
memcpy(dest->outbuffer+*(dest->outbuffer_size), dest->buffer, datacount);
*(dest->outbuffer_size) += datacount;
}
}
/*
* Prepare for output to a stdio stream.
* The caller must have already opened the stream, and is responsible
* for closing it after finishing compression.
*/
void zm_jpeg_mem_dest(j_compress_ptr cinfo, JOCTET *outbuffer, size_t *outbuffer_size) {
mem_dest_ptr dest;
/* The destination object is made permanent so that multiple JPEG images
* can be written to the same file without re-executing jpeg_stdio_dest.
* This makes it dangerous to use this manager and a different destination
* manager serially with the same JPEG object, because their private object
* sizes may be different. Caveat programmer.
*/
if ( cinfo->dest == nullptr ) {
/* first time for this JPEG object? */
cinfo->dest = (struct jpeg_destination_mgr *)(*cinfo->mem->alloc_small)
((j_common_ptr) cinfo, JPOOL_PERMANENT, SIZEOF(mem_destination_mgr));
}
dest = (mem_dest_ptr) cinfo->dest;
dest->pub.init_destination = init_destination;
dest->pub.empty_output_buffer = empty_output_buffer;
dest->pub.term_destination = term_destination;
dest->outbuffer = outbuffer;
dest->outbuffer_size = outbuffer_size;
}
/* Expanded data source object for memory input */
typedef struct {
struct jpeg_source_mgr pub; /* public fields */
JOCTET * inbuffer; /* source stream */
int inbuffer_size;
int inbuffer_size_hwm; /* High water mark */
JOCTET * buffer; /* start of buffer */
boolean start_of_data; /* have we gotten any data yet? */
} mem_source_mgr;
typedef mem_source_mgr * mem_src_ptr;
#define INPUT_BUF_SIZE 4096 /* choose an efficiently fread'able size */
/*
* Initialize source --- called by jpeg_read_header
* before any data is actually read.
*/
static void init_source (j_decompress_ptr cinfo) {
mem_src_ptr src = (mem_src_ptr) cinfo->src;
/* We reset the empty-input-file flag for each image,
* but we don't clear the input buffer.
* This is correct behavior for reading a series of images from one source.
*/
src->start_of_data = TRUE;
src->pub.bytes_in_buffer = 0;
}
/*
* Fill the input buffer --- called whenever buffer is emptied.
*
* In typical applications, this should read fresh data into the buffer
* (ignoring the current state of next_input_byte & bytes_in_buffer),
* reset the pointer & count to the start of the buffer, and return TRUE
* indicating that the buffer has been reloaded. It is not necessary to
* fill the buffer entirely, only to obtain at least one more byte.
*
* There is no such thing as an EOF return. If the end of the file has been
* reached, the routine has a choice of ERREXIT() or inserting fake data into
* the buffer. In most cases, generating a warning message and inserting a
* fake EOI marker is the best course of action --- this will allow the
* decompressor to output however much of the image is there. However,
* the resulting error message is misleading if the real problem is an empty
* input file, so we handle that case specially.
*
* In applications that need to be able to suspend compression due to input
* not being available yet, a FALSE return indicates that no more data can be
* obtained right now, but more may be forthcoming later. In this situation,
* the decompressor will return to its caller (with an indication of the
* number of scanlines it has read, if any). The application should resume
* decompression after it has loaded more data into the input buffer. Note
* that there are substantial restrictions on the use of suspension --- see
* the documentation.
*
* When suspending, the decompressor will back up to a convenient restart point
* (typically the start of the current MCU). next_input_byte & bytes_in_buffer
* indicate where the restart point will be if the current call returns FALSE.
* Data beyond this point must be rescanned after resumption, so move it to
* the front of the buffer rather than discarding it.
*/
static boolean fill_input_buffer (j_decompress_ptr cinfo) {
mem_src_ptr src = (mem_src_ptr) cinfo->src;
size_t nbytes;
memcpy(src->buffer, src->inbuffer, (size_t) src->inbuffer_size);
nbytes = src->inbuffer_size;
if ( nbytes == 0 ) {
if ( src->start_of_data ) /* Treat empty input file as fatal error */
ERREXIT(cinfo, JERR_INPUT_EMPTY);
WARNMS(cinfo, JWRN_JPEG_EOF);
/* Insert a fake EOI marker */
src->buffer[0] = (JOCTET) 0xFF;
src->buffer[1] = (JOCTET) JPEG_EOI;
nbytes = 2;
}
src->pub.next_input_byte = src->buffer;
src->pub.bytes_in_buffer = nbytes;
src->start_of_data = FALSE;
return TRUE;
}
/*
* Skip data --- used to skip over a potentially large amount of
* uninteresting data (such as an APPn marker).
*
* Writers of suspendable-input applications must note that skip_input_data
* is not granted the right to give a suspension return. If the skip extends
* beyond the data currently in the buffer, the buffer can be marked empty so
* that the next read will cause a fill_input_buffer call that can suspend.
* Arranging for additional bytes to be discarded before reloading the input
* buffer is the application writer's problem.
*/
static void skip_input_data(j_decompress_ptr cinfo, long num_bytes) {
mem_src_ptr src = (mem_src_ptr) cinfo->src;
/* Just a dumb implementation for now. Could use fseek() except
* it doesn't work on pipes. Not clear that being smart is worth
* any trouble anyway --- large skips are infrequent.
*/
if ( num_bytes > 0 ) {
while ( num_bytes > (long) src->pub.bytes_in_buffer ) {
num_bytes -= (long) src->pub.bytes_in_buffer;
(void) fill_input_buffer(cinfo);
/* note we assume that fill_input_buffer will never return FALSE,
* so suspension need not be handled.
*/
}
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
}
/*
* Terminate source --- called by jpeg_finish_decompress
* after all data has been read. Often a no-op.
*
* NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
* application must deal with any cleanup that should happen even
* for error exit.
*/
static void term_source(j_decompress_ptr cinfo) {
/* no work necessary here */
}
/*
* Prepare for input from a memory stream.
* The caller must have already opened the stream, and is responsible
* for closing it after finishing decompression.
*/
void zm_jpeg_mem_src(j_decompress_ptr cinfo, const JOCTET *inbuffer, size_t inbuffer_size) {
mem_src_ptr src;
/* The source object and input buffer are made permanent so that a series
* of JPEG images can be read from the same file by calling zm_jpeg_mem_src
* only before the first one. (If we discarded the buffer at the end of
* one image, we'd likely lose the start of the next one.)
* This makes it unsafe to use this manager and a different source
* manager serially with the same JPEG object. Caveat programmer.
*/
if ( cinfo->src == nullptr ) {
/* first time for this JPEG object? */
cinfo->src = (struct jpeg_source_mgr *)(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, SIZEOF(mem_source_mgr));
src = (mem_src_ptr) cinfo->src;
src->buffer = (JOCTET *)(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, inbuffer_size * SIZEOF(JOCTET));
src->inbuffer_size_hwm = inbuffer_size;
} else {
src = (mem_src_ptr) cinfo->src;
if ( static_cast<size_t>(src->inbuffer_size_hwm) < inbuffer_size ) {
src->buffer = (JOCTET *)(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, inbuffer_size * SIZEOF(JOCTET));
src->inbuffer_size_hwm = inbuffer_size;
}
}
src = (mem_src_ptr) cinfo->src;
src->pub.init_source = init_source;
src->pub.fill_input_buffer = fill_input_buffer;
src->pub.skip_input_data = skip_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
src->pub.term_source = term_source;
src->inbuffer = (JOCTET *)inbuffer;
src->inbuffer_size = inbuffer_size;
src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
src->pub.next_input_byte = nullptr; /* until buffer loaded */
/* Decrement the error count slowly when processing ok otherwise occasional frame errors build up to a zmc exit */
if (jpeg_err_count > 0) jpeg_err_count--; else jpeg_err_count = 0;
}
void zm_use_std_huff_tables(j_decompress_ptr cinfo) {
/* JPEG standard Huffman tables (cf. JPEG standard section K.3) */
/* IMPORTANT: these are only valid for 8-bit data precision! */
static const JHUFF_TBL dclumin = {
{ /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 },
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 },
FALSE
};
static const JHUFF_TBL dcchrome = {
{ /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 },
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 },
FALSE
};
static const JHUFF_TBL aclumin = {
{ /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d },
{
0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2a, 0x34, 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, 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, 0xe1, 0xe2,
0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
0xf9, 0xfa
},
FALSE
};
static const JHUFF_TBL acchrome = {
{ /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 },
{
0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
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;
}
}