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tag: exif: Adds mapping for GST_TAG_APPLICATION_DATA

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Adds mapping for GST_TAG_APPLICATION_DATA to the exif
'maker-note' tag.
This commit is contained in:
Thiago Santos 2010-08-17 15:05:32 -03:00
parent 421e1e05ff
commit 57013ae63e
2 changed files with 112 additions and 0 deletions
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100
gst-libs/gst/tag/gstexiftag.c
View file

@ -181,6 +181,7 @@ static const GstExifTagMatch tag_map_ifd0[] = {
static const GstExifTagMatch tag_map_exif[] = {
{NULL, EXIF_VERSION_TAG, EXIF_TYPE_UNDEFINED, 0, NULL, NULL},
{GST_TAG_DATE_TIME, 0x9003, EXIF_TYPE_ASCII, 0, NULL, NULL},
{GST_TAG_APPLICATION_DATA, 0x927C, EXIF_TYPE_UNDEFINED, 0, NULL, NULL},
{NULL, 0, 0, 0, NULL, NULL}
};
@ -492,6 +493,47 @@ write_exif_ascii_tag_from_taglist (GstExifWriter * writer,
g_free (str);
}
static void
write_exif_undefined_tag_from_taglist (GstExifWriter * writer,
const GstTagList * taglist, const GstExifTagMatch * exiftag)
{
const GValue *value;
const guint8 *data = NULL;
gint size = 0;
gint tag_size = gst_tag_list_get_tag_size (taglist, exiftag->gst_tag);
if (tag_size != 1) {
GST_WARNING ("Only the first item in the taglist will be serialized");
return;
}
value = gst_tag_list_get_value_index (taglist, exiftag->gst_tag, 0);
/* do some conversion if needed */
switch (G_VALUE_TYPE (value)) {
case G_TYPE_STRING:
data = (guint8 *) g_value_get_string (value);
size = strlen ((gchar *) data); /* no need to +1, undefined doesn't require it */
break;
default:
if (G_VALUE_TYPE (value) == GST_TYPE_BUFFER) {
GstBuffer *buf = gst_value_get_buffer (value);
data = GST_BUFFER_DATA (buf);
size = GST_BUFFER_SIZE (buf);
} else {
GST_WARNING ("Conversion from %s to raw data not supported",
G_VALUE_TYPE_NAME (value));
}
break;
}
if (size == 0)
return;
write_exif_undefined_tag (writer, exiftag->exif_tag, data, size);
}
static void
write_exif_tag_from_taglist (GstExifWriter * writer, const GstTagList * taglist,
const GstExifTagMatch * exiftag)
@ -508,6 +550,9 @@ write_exif_tag_from_taglist (GstExifWriter * writer, const GstTagList * taglist,
case EXIF_TYPE_ASCII:
write_exif_ascii_tag_from_taglist (writer, taglist, exiftag);
break;
case EXIF_TYPE_UNDEFINED:
write_exif_undefined_tag_from_taglist (writer, taglist, exiftag);
break;
default:
GST_WARNING ("Unhandled tag type %d", exiftag->exif_type);
}
@ -688,6 +733,58 @@ parse_exif_ascii_tag (GstExifReader * reader, const GstExifTagMatch * tag,
g_free (str);
}
static void
parse_exif_undefined_tag (GstExifReader * reader, const GstExifTagMatch * tag,
guint32 count, guint32 offset, const guint8 * offset_as_data)
{
GType tagtype;
guint8 *data;
guint32 real_offset;
if (count > 4) {
if (offset < reader->base_offset) {
GST_WARNING ("Offset is smaller (%u) than base offset (%u)", offset,
reader->base_offset);
return;
}
real_offset = offset - reader->base_offset;
if (real_offset >= GST_BUFFER_SIZE (reader->buffer)) {
GST_WARNING ("Invalid offset %u for buffer of size %u, not adding tag %s",
real_offset, GST_BUFFER_SIZE (reader->buffer), tag->gst_tag);
return;
}
/* +1 because it could be a string without the \0 */
data = malloc (sizeof (guint8) * count + 1);
memcpy (data, GST_BUFFER_DATA (reader->buffer) + real_offset, count);
data[count] = 0;
} else {
data = malloc (sizeof (guint8) * count + 1);
memcpy (data, (guint8 *) offset_as_data, count);
data[count] = 0;
}
tagtype = gst_tag_get_type (tag->gst_tag);
if (tagtype == GST_TYPE_BUFFER) {
GstBuffer *buf = gst_buffer_new ();
gst_buffer_set_data (buf, data, count);
data = NULL;
gst_tag_list_add (reader->taglist, GST_TAG_MERGE_APPEND, tag->gst_tag,
buf, NULL);
gst_buffer_unref (buf);
} else if (tagtype == G_TYPE_STRING) {
gst_tag_list_add (reader->taglist, GST_TAG_MERGE_REPLACE, tag->gst_tag,
data, NULL);
} else {
GST_WARNING ("No parsing function associated to %x(%s)", tag->exif_tag,
tag->gst_tag);
}
g_free (data);
}
static void
parse_exif_rational_tag (GstExifReader * exif_reader,
const gchar * gst_tag, guint32 count, guint32 offset, gdouble multiplier)
@ -946,6 +1043,9 @@ parse_exif_ifd (GstExifReader * exif_reader, gint buf_offset,
parse_exif_rational_tag (exif_reader, tag_map[map_index].gst_tag,
tagdata.count, tagdata.offset, 1);
break;
case EXIF_TYPE_UNDEFINED:
parse_exif_undefined_tag (exif_reader, &tag_map[map_index],
tagdata.count, tagdata.offset, tagdata.offset_as_data);
default:
GST_WARNING ("Unhandled tag type: %u", tagdata.tag_type);
break;

12
tests/check/libs/tag.c
View file

@ -1243,6 +1243,8 @@ GST_START_TEST (test_exif_tags_serialization_deserialization)
{
GValue value = { 0 };
GstDateTime *datetime = NULL;
GstBuffer *buf = NULL;
gint i;
g_value_init (&value, G_TYPE_STRING);
g_value_set_static_string (&value, "my string");
@ -1334,6 +1336,16 @@ GST_START_TEST (test_exif_tags_serialization_deserialization)
gst_date_time_unref (datetime);
do_simple_exif_tag_serialization_deserialization (GST_TAG_DATE_TIME, &value);
g_value_unset (&value);
g_value_init (&value, GST_TYPE_BUFFER);
buf = gst_buffer_new_and_alloc (1024);
for (i = 0; i < 1024; i++)
GST_BUFFER_DATA (buf)[i] = i % 255;
gst_value_set_buffer (&value, buf);
gst_buffer_unref (buf);
do_simple_exif_tag_serialization_deserialization (GST_TAG_APPLICATION_DATA,
&value);
g_value_unset (&value);
}
GST_END_TEST;