/**
* gst_tag_list_from_exif_buffer_with_tiff_header:
* @buffer: The exif buffer
*
* Parses the exif tags starting with a tiff header structure.
*
* Returns: The taglist
*
* Since: 0.10.30
*/
GstTagList *
gst_tag_list_from_exif_buffer_with_tiff_header (const GstBuffer * buffer)
{
GstByteReader reader;
guint16 fortytwo = 42;
guint16 endianness = 0;
guint32 offset;
GstTagList *taglist = NULL;
GstBuffer *subbuffer;
GST_LOG ("Parsing exif tags with tiff header of size %u",
GST_BUFFER_SIZE (buffer));
gst_byte_reader_init_from_buffer (&reader, buffer);
GST_LOG ("Parsing the tiff header");
if (!gst_byte_reader_get_uint16_be (&reader, &endianness)) {
goto byte_reader_fail;
}
if (endianness == TIFF_LITTLE_ENDIAN) {
if (!gst_byte_reader_get_uint16_le (&reader, &fortytwo) ||
!gst_byte_reader_get_uint32_le (&reader, &offset))
goto byte_reader_fail;
} else if (endianness == TIFF_BIG_ENDIAN) {
if (!gst_byte_reader_get_uint16_be (&reader, &fortytwo) ||
!gst_byte_reader_get_uint32_be (&reader, &offset))
goto byte_reader_fail;
} else {
GST_WARNING ("Invalid endianness number %u", endianness);
return NULL;
}
if (fortytwo != 42) {
GST_WARNING ("Invalid magic number %u, should be 42", fortytwo);
return NULL;
}
subbuffer = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buffer) -
(TIFF_HEADER_SIZE - 2));
memcpy (GST_BUFFER_DATA (subbuffer),
GST_BUFFER_DATA (buffer) + TIFF_HEADER_SIZE,
GST_BUFFER_SIZE (buffer) - TIFF_HEADER_SIZE);
taglist = gst_tag_list_from_exif_buffer (subbuffer,
endianness == TIFF_LITTLE_ENDIAN ? G_LITTLE_ENDIAN : G_BIG_ENDIAN, 8);
gst_buffer_unref (subbuffer);
return taglist;
byte_reader_fail:
{
GST_WARNING ("Failed to read values from buffer");
return NULL;
}
}
static PyObject *
_wrap_gst_tag_list_from_exif_buffer(PyObject *self, PyObject *args, PyObject *kwargs)
{
static char *kwlist[] = { "buffer", "byte_order", "base_offset", NULL };
PyObject *py_buffer;
int byte_order;
GstTagList *ret;
unsigned long base_offset;
const GstBuffer *buffer;
if (!PyArg_ParseTupleAndKeywords(args, kwargs,"Oik:tag_list_from_exif_buffer", kwlist, &py_buffer, &byte_order, &base_offset))
return NULL;
buffer = GST_BUFFER(pygstminiobject_get (py_buffer));
if (PyErr_Occurred())
return NULL;
pyg_begin_allow_threads;
ret = gst_tag_list_from_exif_buffer(buffer, byte_order, base_offset);
pyg_end_allow_threads;
/* pyg_boxed_new handles NULL checking */
return pyg_boxed_new(GST_TYPE_TAG_LIST, (GstTagList*) ret, TRUE, TRUE);
}
