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/*
* netcam_jpeg.c
*
* Module for handling JPEG decompression for network cameras.
*
* This code was inspired by the original module written by
* Jeroen Vreeken and enhanced by several Motion project
* contributors, particularly Angel Carpintero and
* Christopher Price.
*
* Copyright 2005, William M. Brack
* This program is published under the GNU Public license
*/
#include "rotate.h" /* already includes motion.h */
#include <jpeglib.h>
#include <jerror.h>
/*
* netcam_source_mgr is a locally-defined structure to contain elements
* which are not present in the standard libjpeg (the element 'pub' is a
* pointer to the standard information)
*/
typedef struct {
struct jpeg_source_mgr pub;
char *data;
int length;
JOCTET *buffer;
boolean start_of_file;
} netcam_source_mgr;
typedef netcam_source_mgr *netcam_src_ptr;
/*
* Here we declare function prototypes for all the routines involved with
* overriding libjpeg functions. The reason these are required is that,
* although the standard library handles input and output with stdio,
* we are working with "remote" data (from the camera or from a file).
*/
static void netcam_init_source(j_decompress_ptr);
static boolean netcam_fill_input_buffer(j_decompress_ptr);
static void netcam_skip_input_data(j_decompress_ptr, long);
static void netcam_term_source(j_decompress_ptr);
static void netcam_memory_src(j_decompress_ptr, char *, int);
static void netcam_error_exit(j_common_ptr);
static void netcam_init_source(j_decompress_ptr cinfo)
{
/*
* Get our "private" structure from the libjpeg structure
*/
netcam_src_ptr src = (netcam_src_ptr) cinfo->src;
/*
* Set the 'start_of_file' flag in our private structure
* (used by my_fill_input_buffer)
*/
src->start_of_file = TRUE;
}
static boolean netcam_fill_input_buffer(j_decompress_ptr cinfo)
{
netcam_src_ptr src = (netcam_src_ptr) cinfo->src;
size_t nbytes;
/*
* start_of_file is set any time netcam_init_source has been called
* since the last entry to this routine. This would be the normal
* path when a new image is to be processed. It is assumed that
* this routine will only be called once for the entire image.
* If an unexpected call (with start_of_file FALSE) occurs, the
* routine will insert a "fake" "end of image" marker and return
* to the library to process whatever data remains from the original
* image (the one with errors).
*
* I'm not yet clear on what the result (from the application's
* point of view) will be from this logic. If the application
* expects that a completely new image will be started, this will
* give trouble.
*/
if (src->start_of_file) {
nbytes = src->length;
src->buffer = (JOCTET *) src->data;
} else {
/* Insert a fake EOI marker - as per jpeglib recommendation */
if (debug_level > CAMERA_VERBOSE)
motion_log(LOG_INFO, 0, "%s: **fake EOI inserted**", __FUNCTION__);
src->buffer[0] = (JOCTET) 0xFF;
src->buffer[1] = (JOCTET) JPEG_EOI; /* 0xD9 */
nbytes = 2;
}
src->pub.next_input_byte = src->buffer;
src->pub.bytes_in_buffer = nbytes;
src->start_of_file = FALSE;
return TRUE;
}
static void netcam_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
{
netcam_src_ptr src = (netcam_src_ptr) cinfo->src;
if (num_bytes > 0) {
while (num_bytes > (long) src->pub.bytes_in_buffer) {
num_bytes -= (long) src->pub.bytes_in_buffer;
(void) netcam_fill_input_buffer (cinfo);
}
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
}
static void netcam_term_source(j_decompress_ptr cinfo ATTRIBUTE_UNUSED)
{
}
/**
* netcam_memory_src
*
* Routine to setup for fetching data from a netcam buffer, used by the
* JPEG library decompression routine.
*
* Parameters:
* cinfo pointer to the jpeg decompression object
* data pointer to the image data received from a netcam
* length total size of the image
*
* Returns: Nothing
*
*/
static void netcam_memory_src(j_decompress_ptr cinfo, char *data, int length)
{
netcam_src_ptr src;
if (cinfo->src == NULL) {
cinfo->src = (struct jpeg_source_mgr *)
(*cinfo->mem->alloc_small)
((j_common_ptr) cinfo, JPOOL_PERMANENT,
sizeof (netcam_source_mgr));
}
src = (netcam_src_ptr)cinfo->src;
src->data = data;
src->length = length;
src->pub.init_source = netcam_init_source;
src->pub.fill_input_buffer = netcam_fill_input_buffer;
src->pub.skip_input_data = netcam_skip_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart;
src->pub.term_source = netcam_term_source;
src->pub.bytes_in_buffer = 0;
src->pub.next_input_byte = NULL;
}
/**
* netcam_error_exit
*
* Routine to override the libjpeg error exit routine so
* that we can just throw away the bad frame and continue
* with more data from the netcam.
*
* Parameters
*
* cinfo pointer to the decompression control structure
*
* Returns: does an (ugly) longjmp to get back to netcam_jpeg
* code
*
*/
static void netcam_error_exit(j_common_ptr cinfo)
{
/* fetch our pre-stored pointer to the netcam context */
netcam_context_ptr netcam = cinfo->client_data;
/* output the message associated with the error */
(*cinfo->err->output_message)(cinfo);
/* set flag to show the decompression had errors */
netcam->jpeg_error |= 1;
/* need to "cleanup" the aborted decompression */
jpeg_destroy (cinfo);
if (debug_level > CAMERA_VERBOSE)
motion_log(LOG_ERR, 0, "%s: netcam->jpeg_error %d",
__FUNCTION__, netcam->jpeg_error);
/* jump back to wherever we started */
longjmp(netcam->setjmp_buffer, 1);
}
/**
* netcam_output_message
*
* Routine to override the libjpeg error message output routine.
* We do this so that we can output our module and thread i.d.,
* as well as put the message to the motion log.
*
* Parameters
*
* cinfo pointer to the decompression control structure
*
* Returns Nothing
*
*/
static void netcam_output_message(j_common_ptr cinfo)
{
char buffer[JMSG_LENGTH_MAX];
/* fetch our pre-stored pointer to the netcam context */
netcam_context_ptr netcam = cinfo->client_data;
/*
* While experimenting with a "appro" netcam it was discovered
* that the jpeg data produced by the camera caused warning
* messages from libjpeg (JWRN_EXTRANEOUS_DATA). The following
* code is to assure that specific warning is ignored.
*
* NOTE: It's likely that we will discover other error message
* codes which we want to ignore. In that case, we should have
* some sort of table-lookup to decide which messages we really
* care about.
*/
if ((cinfo->err->msg_code != JWRN_EXTRANEOUS_DATA) &&
(cinfo->err->msg_code == JWRN_NOT_SEQUENTIAL) && (!netcam->netcam_tolerant_check))
netcam->jpeg_error |= 2; /* Set flag to show problem */
/*
* We only display and log errors when debug_level
* is non-zero. The reasoning here is that these kinds
* of errors are only produced when the input data is
* wrong, and that indicates a network problem rather
* than a problem with the content.
*/
if (debug_level > CAMERA_VERBOSE) {
/*
* Format the message according to library standards.
* Write it out to the motion log.
*/
(*cinfo->err->format_message)(cinfo, buffer);
motion_log(LOG_ERR, 0, "%s: %s", __FUNCTION__, buffer);
}
}
/**
* netcam_init_jpeg
*
* Initialises the JPEG library prior to doing a
* decompression.
*
* Parameters:
* netcam pointer to netcam_context
* cinfo pointer to JPEG decompression context
*
* Returns: Error code
*/
static int netcam_init_jpeg(netcam_context_ptr netcam, j_decompress_ptr cinfo)
{
netcam_buff_ptr buff;
/*
* First we check whether a new image has arrived. If not, we
* setup to wait for 1/2 a frame time. This will (hopefully)
* help in synchronizing the camera frames with the motion main
* loop.
*/
pthread_mutex_lock(&netcam->mutex);
if (netcam->imgcnt_last == netcam->imgcnt) { /* need to wait */
struct timespec waittime;
struct timeval curtime;
int retcode;
/*
* We calculate the delay time (representing the desired frame
* rate). This delay time is in *nanoseconds*.
* We will wait 0.5 seconds which gives a practical minimum
* framerate of 2 which is desired for the motion_loop to
* function.
*/
gettimeofday(&curtime, NULL);
curtime.tv_usec += 500000;
if (curtime.tv_usec > 1000000) {
curtime.tv_usec -= 1000000;
curtime.tv_sec++;
}
waittime.tv_sec = curtime.tv_sec;
waittime.tv_nsec = 1000L * curtime.tv_usec;
do {
retcode = pthread_cond_timedwait(&netcam->pic_ready,
&netcam->mutex, &waittime);
} while (retcode == EINTR);
if (retcode) { /* we assume a non-zero reply is ETIMEOUT */
pthread_mutex_unlock(&netcam->mutex);
if (debug_level > CAMERA_WARNINGS)
motion_log(-1, 0, "%s: no new pic, no signal rcvd", __FUNCTION__);
return NETCAM_GENERAL_ERROR | NETCAM_NOTHING_NEW_ERROR;
}
if (debug_level > CAMERA_VERBOSE)
motion_log(-1, 0, "%s: ***new pic delay successful***", __FUNCTION__);
}
netcam->imgcnt_last = netcam->imgcnt;
/* set latest buffer as "current" */
buff = netcam->latest;
netcam->latest = netcam->jpegbuf;
netcam->jpegbuf = buff;
pthread_mutex_unlock(&netcam->mutex);
/* clear any error flag from previous work */
netcam->jpeg_error = 0;
buff = netcam->jpegbuf;
/* prepare for the decompression */
/* Initialize the JPEG decompression object */
jpeg_create_decompress(cinfo);
/* Set up own error exit routine */
cinfo->err = jpeg_std_error(&netcam->jerr);
cinfo->client_data = netcam;
netcam->jerr.error_exit = netcam_error_exit;
netcam->jerr.output_message = netcam_output_message;
/* Specify the data source as our own routine */
netcam_memory_src(cinfo, buff->ptr, buff->used);
/* Read file parameters (rejecting tables-only) */
jpeg_read_header(cinfo, TRUE);
/* Override the desired colour space */
cinfo->out_color_space = JCS_YCbCr;
/* Start the decompressor */
jpeg_start_decompress(cinfo);
if (debug_level > CAMERA_VERBOSE)
motion_log(LOG_INFO, 0, "%s: jpeg_error %d", __FUNCTION__, netcam->jpeg_error);
return netcam->jpeg_error;
}
static int netcam_image_conv(netcam_context_ptr netcam,
struct jpeg_decompress_struct *cinfo,
unsigned char *image)
{
JSAMPARRAY line; /* array of decomp data lines */
unsigned char *wline; /* will point to line[0] */
/* Working variables */
int linesize, i;
unsigned char *upic, *vpic;
unsigned char *pic = image;
unsigned char y; /* switch for decoding YUV data */
unsigned int width, height;
width = cinfo->output_width;
height = cinfo->output_height;
if (width && ((width != netcam->width) || (height != netcam->height))) {
motion_log(LOG_ERR, 0,
"%s: JPEG image size %dx%d, JPEG was %dx%d",
__FUNCTION__, netcam->width, netcam->height, width, height);
jpeg_destroy_decompress (cinfo);
netcam->jpeg_error |= 4;
return netcam->jpeg_error;
}
/* Set the output pointers (these come from YUV411P definition */
upic = pic + width * height;
vpic = upic + (width * height) / 4;
/* YCbCr format will give us one byte each for YUV */
linesize = cinfo->output_width * 3;
/* Allocate space for one line */
line = (cinfo->mem->alloc_sarray)((j_common_ptr) cinfo, JPOOL_IMAGE,
cinfo->output_width * cinfo->output_components, 1);
wline = line[0];
y = 0;
while (cinfo->output_scanline < height) {
jpeg_read_scanlines (cinfo, line, 1);
for (i = 0; i < linesize; i += 3) {
pic[i / 3] = wline[i];
if (i & 1) {
upic[(i / 3) / 2] = wline[i + 1];
vpic[(i / 3) / 2] = wline[i + 2];
}
}
pic += linesize / 3;
if (y++ & 1) {
upic += width / 2;
vpic += width / 2;
}
}
jpeg_finish_decompress (cinfo);
jpeg_destroy_decompress (cinfo);
/* rotate as specified */
if (netcam->cnt->rotate_data.degrees > 0)
rotate_map(netcam->cnt, image);
if (debug_level > CAMERA_VERBOSE)
motion_log(LOG_INFO, 0, "%s: jpeg_error %d",
__FUNCTION__, netcam->jpeg_error);
return netcam->jpeg_error;
}
/**
* netcam_proc_jpeg
*
* Routine to decode an image received from a netcam into a YUV420P buffer
* suitable for processing by motion.
*
* Parameters:
* netcam pointer to the netcam_context structure
* image Pointer to a buffer for the returned image
*
* Returns:
*
* 0 Success
* non-zero error code from other routines
* (e.g. netcam_init_jpeg or netcam_image_conv)
* or just NETCAM_GENERAL_ERROR
*/
int netcam_proc_jpeg(netcam_context_ptr netcam, unsigned char *image)
{
struct jpeg_decompress_struct cinfo; /* decompression control struct */
int retval = 0; /* value returned to caller */
int ret; /* working var */
/*
* This routine is only called from the main thread.
* We need to "protect" the "latest" image while we
* decompress it. netcam_init_jpeg uses
* netcam->mutex to do this;
*/
if (debug_level > CAMERA_INFO)
motion_log(LOG_INFO, 0, "%s: processing jpeg image - content length "
"%d", __FUNCTION__, netcam->latest->content_length);
ret = netcam_init_jpeg(netcam, &cinfo);
if (ret != 0) {
if (debug_level > CAMERA_INFO)
motion_log(LOG_ERR, 0, "%s: ret %d", __FUNCTION__, ret);
return ret;
}
/* Do a sanity check on dimensions
* If dimensions have changed we throw an
* error message that will cause
* restart of Motion
*/
if (netcam->width) { /* 0 means not yet init'ed */
if ((cinfo.output_width != netcam->width) ||
(cinfo.output_height != netcam->height)) {
retval = NETCAM_RESTART_ERROR;
motion_log(LOG_ERR, 0,
"%s: Camera width/height mismatch "
"with JPEG image - expected %dx%d, JPEG %dx%d",
" retval %d", __FUNCTION__, netcam->width, netcam->height,
cinfo.output_width, cinfo.output_height, retval);
return retval;
}
}
/* do the conversion */
ret = netcam_image_conv(netcam, &cinfo, image);
if (ret != 0) {
retval |= NETCAM_JPEG_CONV_ERROR;
if (debug_level > CAMERA_INFO)
motion_log(LOG_ERR, 0, "%s: ret %d retval %d", __FUNCTION__,
ret, retval);
}
return retval;
}
/**
* netcam_get_dimensions
*
* This function gets the height and width of the JPEG image
* located in the supplied netcam_image_buffer
*
* Parameters
*
* netcam pointer to the netcam context
*
* Returns: Nothing, but fills in width and height into context
*
*/
void netcam_get_dimensions(netcam_context_ptr netcam)
{
struct jpeg_decompress_struct cinfo; /* decompression control struct */
int ret;
ret = netcam_init_jpeg(netcam, &cinfo);
netcam->width = cinfo.output_width;
netcam->height = cinfo.output_height;
netcam->JFIF_marker = cinfo.saw_JFIF_marker;
jpeg_destroy_decompress(&cinfo);
if (debug_level > CAMERA_INFO)
motion_log(LOG_ERR, 0, "%s: JFIF_marker %s PRESENT ret %d",
__FUNCTION__, netcam->JFIF_marker ? "IS" : "NOT", ret);
}
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