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tag: exif: Write ExifVersion tag

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Write ExifVersion tag unconditionally when creating exif
buffers. Might help other applications parsing of this data.
This commit is contained in:
Thiago Santos 2010-08-04 13:01:21 -03:00
parent f600b510fe
commit 43e1f0474f
1 changed files with 31 additions and 0 deletions
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31
gst-libs/gst/tag/gstexiftag.c
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@ -166,6 +166,7 @@ static gint deserialize_speed (GstExifReader * exif_reader,
#define EXIF_IFD_TAG 0x8769
#define EXIF_GPS_IFD_TAG 0x8825
#define EXIF_VERSION_TAG 0x9000
/* useful macros for speed tag */
#define METERS_PER_SECOND_TO_KILOMETERS_PER_HOUR (3.6)
@ -184,6 +185,7 @@ static const GstExifTagMatch tag_map_ifd0[] = {
{GST_TAG_COPYRIGHT, 0x8298, EXIF_TYPE_ASCII, 0, NULL, NULL},
{NULL, EXIF_IFD_TAG, EXIF_TYPE_LONG, 0, NULL, NULL},
{NULL, EXIF_GPS_IFD_TAG, EXIF_TYPE_LONG, 0, NULL, NULL},
{NULL, EXIF_VERSION_TAG, EXIF_TYPE_UNDEFINED, 0, NULL, NULL},
{NULL, 0, 0, 0, NULL, NULL}
};
@ -404,6 +406,27 @@ gst_exif_writer_write_short_tag (GstExifWriter * writer, guint16 tag,
1, offset, TRUE);
}
static void
write_exif_undefined_tag (GstExifWriter * writer, guint16 tag,
const guint8 * data, gint size)
{
guint32 offset;
if (size > 4) {
/* we only use the data offset here, later we add up the
* resulting tag headers offset and the base offset */
offset = gst_byte_writer_get_size (&writer->datawriter);
gst_exif_writer_write_tag_header (writer, tag, EXIF_TYPE_UNDEFINED,
size, offset, FALSE);
gst_byte_writer_put_data (&writer->datawriter, data, size);
} else {
/* small enough to go in the offset */
memcpy ((guint8 *) & offset, data, size);
gst_exif_writer_write_tag_header (writer, tag, EXIF_TYPE_UNDEFINED,
size, offset, TRUE);
}
}
static void
write_exif_ascii_tag (GstExifWriter * writer, guint16 tag, const gchar * str)
{
@ -768,6 +791,10 @@ write_exif_ifd (const GstTagList * taglist, gboolean byte_order,
inner_tag_map = tag_map_gps;
} else if (tag_map[i].exif_tag == EXIF_IFD_TAG) {
inner_tag_map = tag_map_exif;
} else if (tag_map[i].exif_tag == EXIF_VERSION_TAG) {
/* special case where we write the exif version */
write_exif_undefined_tag (&writer, EXIF_VERSION_TAG, (guint8 *) "0230",
4);
}
if (inner_tag_map) {
@ -905,6 +932,10 @@ parse_exif_ifd (GstExifReader * exif_reader, gint buf_offset,
continue;
}
if (tagdata.tag == EXIF_VERSION_TAG) {
/* skip */
continue;
}
/* tags that need specialized deserialization */
if (tag_map[map_index].deserialize) {