/*
* Writes the tag entry.
*
* The tag entry is the tag id, the tag type,
* the count and the offset.
*
* The offset is the on the amount of data writen so far, as one
* can't predict the total bytes that the tag entries will take.
* This means those fields requires being updated later.
*/
static void
gst_exif_writer_write_tag_header (GstExifWriter * writer,
guint16 exif_tag, guint16 exif_type, guint32 count, guint32 offset,
gboolean is_data)
{
GST_DEBUG ("Writing tag entry: id %x, type %u, count %u, offset %u",
exif_tag, exif_type, count, offset);
if (writer->byte_order == G_LITTLE_ENDIAN) {
gst_byte_writer_put_uint16_le (&writer->tagwriter, exif_tag);
gst_byte_writer_put_uint16_le (&writer->tagwriter, exif_type);
gst_byte_writer_put_uint32_le (&writer->tagwriter, count);
gst_byte_writer_put_uint32_le (&writer->tagwriter, offset);
} else if (writer->byte_order == G_BIG_ENDIAN) {
gst_byte_writer_put_uint16_be (&writer->tagwriter, exif_tag);
gst_byte_writer_put_uint16_be (&writer->tagwriter, exif_type);
gst_byte_writer_put_uint32_be (&writer->tagwriter, count);
if (is_data) {
gst_byte_writer_put_uint32_le (&writer->tagwriter, offset);
} else {
gst_byte_writer_put_uint32_be (&writer->tagwriter, offset);
}
} else {
g_assert_not_reached ();
}
writer->tags_total++;
}
/**
* gst_tag_list_to_exif_buffer_with_tiff_header:
* @taglist: The taglist
*
* Formats the tags in taglist into exif structure, a tiff header
* is put in the beginning of the buffer.
*
* Returns: A GstBuffer containing the data
*
* Since: 0.10.30
*/
GstBuffer *
gst_tag_list_to_exif_buffer_with_tiff_header (const GstTagList * taglist)
{
GstBuffer *ifd;
GstByteWriter writer;
guint size;
ifd = gst_tag_list_to_exif_buffer (taglist, G_BYTE_ORDER, 8);
if (ifd == NULL) {
GST_WARNING ("Failed to create exif buffer");
return NULL;
}
size = TIFF_HEADER_SIZE + GST_BUFFER_SIZE (ifd);
/* TODO what is the correct endianness here? */
gst_byte_writer_init_with_size (&writer, size, FALSE);
/* TIFF header */
if (G_BYTE_ORDER == G_LITTLE_ENDIAN) {
gst_byte_writer_put_uint16_le (&writer, TIFF_LITTLE_ENDIAN);
gst_byte_writer_put_uint16_le (&writer, 42);
gst_byte_writer_put_uint32_le (&writer, 8);
} else {
gst_byte_writer_put_uint16_be (&writer, TIFF_BIG_ENDIAN);
gst_byte_writer_put_uint16_be (&writer, 42);
gst_byte_writer_put_uint32_be (&writer, 8);
}
if (!gst_byte_writer_put_data (&writer, GST_BUFFER_DATA (ifd),
GST_BUFFER_SIZE (ifd))) {
GST_WARNING ("Byte writer size mismatch");
/* reaching here is a programming error because we should have a buffer
* large enough */
g_assert_not_reached ();
gst_buffer_unref (ifd);
gst_byte_writer_reset (&writer);
return NULL;
}
gst_buffer_unref (ifd);
return gst_byte_writer_reset_and_get_buffer (&writer);
}
static GstBuffer *
write_exif_ifd (const GstTagList * taglist, gboolean byte_order,
guint32 base_offset, const GstExifTagMatch * tag_map)
{
GstExifWriter writer;
gint i;
GST_DEBUG ("Formatting taglist %p as exif buffer. Byte order: %d, "
"base_offset: %u", taglist, byte_order, base_offset);
g_assert (byte_order == G_LITTLE_ENDIAN || byte_order == G_BIG_ENDIAN);
if (!gst_tag_list_has_ifd_tags (taglist, tag_map)) {
GST_DEBUG ("No tags for this ifd");
return NULL;
}
gst_exif_writer_init (&writer, byte_order);
/* write tag number as 0 */
gst_byte_writer_put_uint16_le (&writer.tagwriter, 0);
/* write both tag headers and data
* in ascending id order */
for (i = 0; tag_map[i].exif_tag != 0; i++) {
/* special cases have NULL gst tag */
if (tag_map[i].gst_tag == NULL) {
GstBuffer *inner_ifd = NULL;
const GstExifTagMatch *inner_tag_map = NULL;
GST_LOG ("Inner ifd tag: %x", tag_map[i].exif_tag);
if (tag_map[i].exif_tag == EXIF_GPS_IFD_TAG) {
inner_tag_map = tag_map_gps;
}
if (inner_tag_map) {
/* The base offset for this inner ifd is the sum of:
* - the current base offset
* - the total tag data of current this ifd
* - the total data of the current ifd
* - its own tag entry length still to be writen (12)
* - 4 bytes for the next ifd entry still to be writen
*/
inner_ifd = write_exif_ifd (taglist, byte_order, base_offset +
gst_byte_writer_get_size (&writer.tagwriter) +
gst_byte_writer_get_size (&writer.datawriter) + 12 + 4,
inner_tag_map);
}
if (inner_ifd) {
GST_DEBUG ("Adding inner ifd: %x", tag_map[i].exif_tag);
gst_exif_writer_write_tag_header (&writer, tag_map[i].exif_tag,
EXIF_TYPE_LONG, 1,
gst_byte_writer_get_size (&writer.datawriter), FALSE);
gst_byte_writer_put_data (&writer.datawriter,
GST_BUFFER_DATA (inner_ifd), GST_BUFFER_SIZE (inner_ifd));
gst_buffer_unref (inner_ifd);
}
continue;
}
GST_LOG ("Checking tag %s", tag_map[i].gst_tag);
if (gst_tag_list_get_value_index (taglist, tag_map[i].gst_tag, 0) == NULL)
continue;
write_exif_tag_from_taglist (&writer, taglist, &tag_map[i]);
}
/* Add the next IFD offset, we just set it to 0 because
* there is no easy way to predict what it is going to be.
* The user might rewrite the value if needed */
gst_byte_writer_put_uint32_le (&writer.tagwriter, 0);
/* write the number of tags */
gst_byte_writer_set_pos (&writer.tagwriter, 0);
if (writer.byte_order == G_LITTLE_ENDIAN)
gst_byte_writer_put_uint16_le (&writer.tagwriter, writer.tags_total);
else
gst_byte_writer_put_uint16_be (&writer.tagwriter, writer.tags_total);
/* now that we know the tag headers size, we can add the offsets */
gst_exif_tag_rewrite_offsets (&writer, base_offset);
return gst_exif_writer_reset_and_get_buffer (&writer);
}
static GstFlowReturn
gst_jif_mux_recombine_image (GstJifMux * self, GstBuffer ** new_buf,
GstBuffer * old_buf)
{
GstBuffer *buf;
GstByteWriter *writer;
GstFlowReturn fret;
GstJifMuxMarker *m;
GList *node;
guint size = self->priv->scan_size;
gboolean writer_status = TRUE;
/* iterate list and collect size */
for (node = self->priv->markers; node; node = g_list_next (node)) {
m = (GstJifMuxMarker *) node->data;
/* some markers like e.g. SOI are empty */
if (m->size) {
size += 2 + m->size;
}
/* 0xff <marker> */
size += 2;
}
GST_INFO_OBJECT (self, "old size: %u, new size: %u",
GST_BUFFER_SIZE (old_buf), size);
/* allocate new buffer */
fret = gst_pad_alloc_buffer_and_set_caps (self->priv->srcpad,
GST_BUFFER_OFFSET (old_buf), size, GST_PAD_CAPS (self->priv->srcpad),
&buf);
if (fret != GST_FLOW_OK)
goto no_buffer;
/* copy buffer metadata */
gst_buffer_copy_metadata (buf, old_buf,
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS);
/* memcopy markers */
writer = gst_byte_writer_new_with_buffer (buf, TRUE);
for (node = self->priv->markers; node && writer_status;
node = g_list_next (node)) {
m = (GstJifMuxMarker *) node->data;
writer_status &= gst_byte_writer_put_uint8 (writer, 0xff);
writer_status &= gst_byte_writer_put_uint8 (writer, m->marker);
GST_DEBUG_OBJECT (self, "marker = %2x, size = %u", m->marker, m->size + 2);
if (m->size) {
writer_status &= gst_byte_writer_put_uint16_be (writer, m->size + 2);
writer_status &= gst_byte_writer_put_data (writer, m->data, m->size);
}
if (m->marker == SOS) {
GST_DEBUG_OBJECT (self, "scan data, size = %u", self->priv->scan_size);
writer_status &=
gst_byte_writer_put_data (writer, self->priv->scan_data,
self->priv->scan_size);
}
}
gst_byte_writer_free (writer);
if (!writer_status) {
GST_WARNING_OBJECT (self, "Failed to write to buffer, calculated size "
"was probably too short");
g_assert_not_reached ();
}
*new_buf = buf;
return GST_FLOW_OK;
no_buffer:
GST_WARNING_OBJECT (self, "failed to allocate output buffer, flow_ret = %s",
gst_flow_get_name (fret));
return fret;
}
