void
metadatamux_exif_create_chunk_from_tag_list (guint8 ** buf, guint32 * size,
const GstTagList * taglist, const MetaExifWriteOptions * opts)
{
ExifData *ed = NULL;
GstBuffer *exif_chunk = NULL;
const GValue *val = NULL;
if (!(buf && size))
goto done;
g_free (*buf);
*buf = NULL;
*size = 0;
val = gst_tag_list_get_value_index (taglist, GST_TAG_EXIF, 0);
if (val) {
exif_chunk = gst_value_get_buffer (val);
if (exif_chunk) {
ed = exif_data_new_from_data (GST_BUFFER_DATA (exif_chunk),
GST_BUFFER_SIZE (exif_chunk));
}
}
if (!ed) {
ed = exif_data_new ();
GST_DEBUG ("setting byteorder %d", opts->byteorder);
switch (opts->byteorder) {
case GST_META_EXIF_BYTE_ORDER_MOTOROLA:
exif_data_set_byte_order (ed, EXIF_BYTE_ORDER_MOTOROLA);
break;
case GST_META_EXIF_BYTE_ORDER_INTEL:
exif_data_set_byte_order (ed, EXIF_BYTE_ORDER_INTEL);
break;
default:
break;
}
exif_data_set_data_type (ed, EXIF_DATA_TYPE_COMPRESSED);
exif_data_fix (ed);
}
gst_tag_list_foreach (taglist, metadatamux_exif_for_each_tag_in_list, ed);
exif_data_save_data (ed, buf, size);
done:
if (ed)
exif_data_unref (ed);
return;
}
static void load_exif_tags( ExifData * ed , JSON::Object & tags )
{
tplog2( " LOADING EXIF TAGS" );
exif_data_set_option( ed , EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS );
exif_data_set_option( ed , EXIF_DATA_OPTION_FOLLOW_SPECIFICATION );
exif_data_fix( ed );
ExifClosure closure;
closure.exif_data = ed;
closure.tags = & tags;
for ( int i = 0; i < EXIF_IFD_COUNT; ++i )
{
if ( ExifContent * c = ed->ifd[i] )
{
exif_content_foreach_entry( c , foreach_exif_entry , & closure );
}
}
tplog2( " LOADED EXIF TAGS" );
}
/* Scan the exif block on the image, if any, and make a set of vips metadata
* tags for what we find.
*/
int
vips__exif_parse( VipsImage *image )
{
void *data;
size_t length;
ExifData *ed;
VipsExifParams params;
const char *str;
if( !vips_image_get_typeof( image, VIPS_META_EXIF_NAME ) )
return( 0 );
if( vips_image_get_blob( image, VIPS_META_EXIF_NAME, &data, &length ) )
return( -1 );
if( !(ed = vips_exif_load_data_without_fix( data, length )) )
return( -1 );
#ifdef DEBUG_VERBOSE
show_tags( ed );
show_values( ed );
#endif /*DEBUG_VERBOSE*/
/* Look for resolution fields and use them to set the VIPS xres/yres
* fields.
*
* If the fields are missing, set them from the image, which will have
* previously had them set from something like JFIF.
*/
if( vips_image_resolution_from_exif( image, ed ) &&
vips_exif_resolution_from_image( ed, image ) ) {
exif_data_free( ed );
return( -1 );
}
/* Make sure all required fields are there before we attach the vips
* metadata.
*/
exif_data_fix( ed );
/* Attach informational fields for what we find.
*/
params.image = image;
params.ed = ed;
exif_data_foreach_content( ed,
(ExifDataForeachContentFunc) vips_exif_get_content, ¶ms );
vips_exif_get_thumbnail( image, ed );
exif_data_free( ed );
/* Orientation handling. ifd0 has the Orientation tag for the main
* image.
*/
if( vips_image_get_typeof( image, "exif-ifd0-Orientation" ) != 0 &&
!vips_image_get_string( image,
"exif-ifd0-Orientation", &str ) ) {
int orientation;
orientation = atoi( str );
orientation = VIPS_CLIP( 1, orientation, 8 );
vips_image_set_int( image, VIPS_META_ORIENTATION, orientation );
}
return( 0 );
}
/* Examine the metadata tags on the image and update the EXIF block.
*/
int
vips__exif_update( VipsImage *image )
{
unsigned char *data;
size_t length;
unsigned int idl;
ExifData *ed;
/* Either parse from the embedded EXIF, or if there's none, make
* some fresh EXIF we can write the resolution to.
*/
if( vips_image_get_typeof( image, VIPS_META_EXIF_NAME ) ) {
if( vips_image_get_blob( image, VIPS_META_EXIF_NAME,
(void *) &data, &length ) )
return( -1 );
if( !(ed = exif_data_new_from_data( data, length )) )
return( -1 );
}
else {
ed = exif_data_new();
exif_data_set_option( ed,
EXIF_DATA_OPTION_FOLLOW_SPECIFICATION );
exif_data_set_data_type( ed, EXIF_DATA_TYPE_COMPRESSED );
exif_data_set_byte_order( ed, EXIF_BYTE_ORDER_INTEL );
/* Create the mandatory EXIF fields with default data.
*/
exif_data_fix( ed );
}
/* Update EXIF tags from the image metadata.
*/
vips_exif_update( ed, image );
/* Update EXIF resolution from the vips image header.
*/
if( vips_exif_resolution_from_image( ed, image ) ) {
exif_data_free( ed );
return( -1 );
}
/* Update EXIF image dimensions from the vips image header.
*/
if( vips_exif_set_dimensions( ed, image ) ) {
exif_data_free( ed );
return( -1 );
}
/* Update EXIF orientation from the vips image header.
*/
if( vips_exif_set_orientation( ed, image ) ) {
exif_data_free( ed );
return( -1 );
}
/* Update the thumbnail.
*/
if( vips_exif_set_thumbnail( ed, image ) ) {
exif_data_free( ed );
return( -1 );
}
/* Reserialise and write. exif_data_save_data() returns an int for some
* reason.
*/
exif_data_save_data( ed, &data, &idl );
if( !idl ) {
vips_error( "exif", "%s", _( "error saving EXIF" ) );
exif_data_free( ed );
return( -1 );
}
length = idl;
#ifdef DEBUG
printf( "vips__exif_update: generated %zd bytes of EXIF\n", length );
#endif /*DEBUG*/
vips_image_set_blob( image, VIPS_META_EXIF_NAME,
(VipsCallbackFn) vips_free, data, length );
exif_data_free( ed );
return( 0 );
}
ExifData* createExifData(const CameraParameters& params) {
ExifData* exifData = exif_data_new();
exif_data_set_option(exifData, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION);
exif_data_set_data_type(exifData, EXIF_DATA_TYPE_COMPRESSED);
exif_data_set_byte_order(exifData, EXIF_BYTE_ORDER_INTEL);
// Create mandatory exif fields and set their default values
exif_data_fix(exifData);
float triplet[3];
float floatValue = 0.0f;
const char* stringValue;
int64_t degrees;
// Datetime, creating and initializing a datetime tag will automatically
// set the current date and time in the tag so just do that.
createEntry(exifData, EXIF_IFD_0, EXIF_TAG_DATE_TIME);
// Make and model
createEntry(exifData, EXIF_IFD_0, EXIF_TAG_MAKE, "Emulator-Goldfish");
createEntry(exifData, EXIF_IFD_0, EXIF_TAG_MODEL, "Emulator-Goldfish");
// Picture size
int width = -1, height = -1;
params.getPictureSize(&width, &height);
if (width >= 0 && height >= 0) {
createEntry(exifData, EXIF_IFD_EXIF,
EXIF_TAG_PIXEL_X_DIMENSION, width);
createEntry(exifData, EXIF_IFD_EXIF,
EXIF_TAG_PIXEL_Y_DIMENSION, height);
}
// Orientation
if (getCameraParam(params,
CameraParameters::KEY_ROTATION,
°rees)) {
// Exif orientation values, please refer to
// http://www.exif.org/Exif2-2.PDF, Section 4.6.4-A-Orientation
// Or these websites:
// http://sylvana.net/jpegcrop/exif_orientation.html
// http://www.impulseadventure.com/photo/exif-orientation.html
enum {
EXIF_ROTATE_CAMERA_CW0 = 1,
EXIF_ROTATE_CAMERA_CW90 = 6,
EXIF_ROTATE_CAMERA_CW180 = 3,
EXIF_ROTATE_CAMERA_CW270 = 8,
};
uint16_t exifOrien = 1;
switch (degrees) {
case 0:
exifOrien = EXIF_ROTATE_CAMERA_CW0;
break;
case 90:
exifOrien = EXIF_ROTATE_CAMERA_CW90;
break;
case 180:
exifOrien = EXIF_ROTATE_CAMERA_CW180;
break;
case 270:
exifOrien = EXIF_ROTATE_CAMERA_CW270;
break;
}
createEntry(exifData, EXIF_IFD_0, EXIF_TAG_ORIENTATION, exifOrien);
}
// Focal length
if (getCameraParam(params,
CameraParameters::KEY_FOCAL_LENGTH,
&floatValue)) {
createEntry(exifData, EXIF_IFD_EXIF, EXIF_TAG_FOCAL_LENGTH, floatValue);
}
// GPS latitude and reference, reference indicates sign, store unsigned
if (getCameraParam(params,
CameraParameters::KEY_GPS_LATITUDE,
&floatValue)) {
convertGpsCoordinate(floatValue, &triplet);
createEntry(exifData, EXIF_IFD_GPS, EXIF_TAG_GPS_LATITUDE, triplet);
const char* ref = floatValue < 0.0f ? "S" : "N";
createEntry(exifData, EXIF_IFD_GPS, EXIF_TAG_GPS_LATITUDE_REF, ref);
}
// GPS longitude and reference, reference indicates sign, store unsigned
if (getCameraParam(params,
CameraParameters::KEY_GPS_LONGITUDE,
&floatValue)) {
convertGpsCoordinate(floatValue, &triplet);
createEntry(exifData, EXIF_IFD_GPS, EXIF_TAG_GPS_LONGITUDE, triplet);
const char* ref = floatValue < 0.0f ? "W" : "E";
createEntry(exifData, EXIF_IFD_GPS, EXIF_TAG_GPS_LONGITUDE_REF, ref);
}
// GPS altitude and reference, reference indicates sign, store unsigned
if (getCameraParam(params,
CameraParameters::KEY_GPS_ALTITUDE,
&floatValue)) {
createEntry(exifData, EXIF_IFD_GPS, EXIF_TAG_GPS_ALTITUDE,
static_cast<float>(fabs(floatValue)));
// 1 indicated below sea level, 0 indicates above sea level
uint8_t ref = floatValue < 0.0f ? 1 : 0;
createEntry(exifData, EXIF_IFD_GPS, EXIF_TAG_GPS_ALTITUDE_REF, ref);
}
// GPS timestamp and datestamp
int64_t timestamp = 0;
if (getCameraParam(params,
CameraParameters::KEY_GPS_TIMESTAMP,
×tamp)) {
std::string date;
if (convertTimestampToTimeAndDate(timestamp, &triplet, &date)) {
createEntry(exifData, EXIF_IFD_GPS, EXIF_TAG_GPS_TIME_STAMP,
triplet, 1.0f);
createEntry(exifData, EXIF_IFD_GPS, EXIF_TAG_GPS_DATE_STAMP,
date.c_str());
}
}
// GPS processing method
if (getCameraParam(params,
CameraParameters::KEY_GPS_PROCESSING_METHOD,
&stringValue)) {
std::vector<unsigned char> data;
// Because this is a tag with an undefined format it has to be prefixed
// with the encoding type. Insert an ASCII prefix first, then the
// actual string. Undefined tags do not have to be null terminated.
data.insert(data.end(),
std::begin(kAsciiPrefix),
std::end(kAsciiPrefix));
data.insert(data.end(), stringValue, stringValue + strlen(stringValue));
createEntry(exifData, EXIF_IFD_GPS, EXIF_TAG_GPS_PROCESSING_METHOD,
&data[0], data.size());
}
return exifData;
}
void
exif_data_load_data (ExifData *data, const unsigned char *d_orig,
unsigned int ds_orig)
{
unsigned int l;
ExifLong offset;
ExifShort n;
const unsigned char *d = d_orig;
unsigned int ds = ds_orig, len;
if (!data || !data->priv || !d || !ds)
return;
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"Parsing %i byte(s) EXIF data...\n", ds);
/*
* It can be that the data starts with the EXIF header. If it does
* not, search the EXIF marker.
*/
if (ds < 6) {
LOG_TOO_SMALL;
return;
}
if (!memcmp (d, ExifHeader, 6)) {
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"Found EXIF header.");
} else {
while (1) {
while ((d[0] == 0xff) && ds) {
d++;
ds--;
}
/* JPEG_MARKER_SOI */
if (d[0] == JPEG_MARKER_SOI) {
d++;
ds--;
continue;
}
/* JPEG_MARKER_APP0 */
if (d[0] == JPEG_MARKER_APP0) {
d++;
ds--;
l = (d[0] << 8) | d[1];
if (l > ds)
return;
d += l;
ds -= l;
continue;
}
/* JPEG_MARKER_APP1 */
if (d[0] == JPEG_MARKER_APP1)
break;
/* Unknown marker or data. Give up. */
exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifData", _("EXIF marker not found."));
return;
}
d++;
ds--;
if (ds < 2) {
LOG_TOO_SMALL;
return;
}
len = (d[0] << 8) | d[1];
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"We have to deal with %i byte(s) of EXIF data.",
len);
d += 2;
ds -= 2;
}
/*
* Verify the exif header
* (offset 2, length 6).
*/
if (ds < 6) {
LOG_TOO_SMALL;
return;
}
if (memcmp (d, ExifHeader, 6)) {
exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifData", _("EXIF header not found."));
return;
}
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"Found EXIF header.");
/* Byte order (offset 6, length 2) */
if (ds < 14)
return;
if (!memcmp (d + 6, "II", 2))
data->priv->order = EXIF_BYTE_ORDER_INTEL;
else if (!memcmp (d + 6, "MM", 2))
data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
else {
exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifData", _("Unknown encoding."));
return;
}
/* Fixed value */
if (exif_get_short (d + 8, data->priv->order) != 0x002a)
return;
/* IFD 0 offset */
offset = exif_get_long (d + 10, data->priv->order);
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"IFD 0 at %i.", (int) offset);
/* Parse the actual exif data (usually offset 14 from start) */
exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
/* IFD 1 offset */
if (offset + 6 + 2 > ds) {
return;
}
n = exif_get_short (d + 6 + offset, data->priv->order);
if (offset + 6 + 2 + 12 * n + 4 > ds) {
return;
}
offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
if (offset) {
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"IFD 1 at %i.", (int) offset);
/* Sanity check. */
if (offset > ds - 6) {
exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
"ExifData", "Bogus offset of IFD1.");
} else {
exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
}
}
/*
* If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
* cameras use pointers in the maker note tag that point to the
* space between IFDs. Here is the only place where we have access
* to that data.
*/
interpret_maker_note(data, d, ds);
/* Fixup tags if requested */
if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
exif_data_fix (data);
}
static int Dfix (lua_State *L) { /** data:fix() */
ExifData *data = checkdata(L);
exif_data_fix(data);
return 0;
}
static int
write_exif( Write *write )
{
#ifdef HAVE_EXIF
unsigned char *data;
size_t data_length;
unsigned int idl;
ExifData *ed;
/* Either parse from the embedded EXIF, or if there's none, make
* some fresh EXIF we can write the resolution to.
*/
if( vips_image_get_typeof( write->in, VIPS_META_EXIF_NAME ) ) {
if( vips_image_get_blob( write->in, VIPS_META_EXIF_NAME,
(void *) &data, &data_length ) )
return( -1 );
if( !(ed = exif_data_new_from_data( data, data_length )) )
return( -1 );
}
else {
ed = exif_data_new();
exif_data_set_option( ed,
EXIF_DATA_OPTION_FOLLOW_SPECIFICATION );
exif_data_set_data_type( ed, EXIF_DATA_TYPE_COMPRESSED );
exif_data_set_byte_order( ed, EXIF_BYTE_ORDER_INTEL );
/* Create the mandatory EXIF fields with default data.
*/
exif_data_fix( ed );
}
/* Update EXIF tags from the image metadata.
*/
vips_exif_update( ed, write->in );
/* Update EXIF resolution from the vips image header.
*/
if( vips__set_exif_resolution( ed, write->in ) ) {
exif_data_free( ed );
return( -1 );
}
/* Update EXIF image dimensions from the vips image header.
*/
if( set_exif_dimensions( ed, write->in ) ) {
exif_data_free( ed );
return( -1 );
}
/* Update EXIF orientation from the vips image header.
*/
if( set_exif_orientation( ed, write->in ) ) {
exif_data_free( ed );
return( -1 );
}
/* Reserialise and write. exif_data_save_data() returns an int for some
* reason.
*/
exif_data_save_data( ed, &data, &idl );
if( !idl ) {
vips_error( "VipsJpeg", "%s", _( "error saving EXIF" ) );
exif_data_free( ed );
return( -1 );
}
data_length = idl;
#ifdef DEBUG
printf( "write_exif: attaching %zd bytes of EXIF\n", data_length );
#endif /*DEBUG*/
exif_data_free( ed );
jpeg_write_marker( &write->cinfo, JPEG_APP0 + 1, data, data_length );
free( data );
#else /*!HAVE_EXIF*/
/* No libexif ... just copy the embedded EXIF over.
*/
if( write_blob( write, VIPS_META_EXIF_NAME, JPEG_APP0 + 1 ) )
return( -1 );
#endif /*!HAVE_EXIF*/
return( 0 );
}
