static inline gboolean
gst_jpeg_parse_skip_marker (GstJpegParse * parse,
GstByteReader * reader, guint8 marker)
{
guint16 size = 0;
if (!gst_byte_reader_get_uint16_be (reader, &size))
return FALSE;
#ifndef GST_DISABLE_DEBUG
/* We'd pry the id of the skipped application segment */
if (marker >= APP0 && marker <= APP15) {
const gchar *id_str = NULL;
if (gst_byte_reader_peek_string_utf8 (reader, &id_str)) {
GST_DEBUG_OBJECT (parse, "unhandled marker %x: '%s' skiping %u bytes",
marker, id_str ? id_str : "(NULL)", size);
} else {
GST_DEBUG_OBJECT (parse, "unhandled marker %x skiping %u bytes", marker,
size);
}
}
#else
GST_DEBUG_OBJECT (parse, "unhandled marker %x skiping %u bytes", marker,
size);
#endif // GST_DISABLE_DEBUG
if (!gst_byte_reader_skip (reader, size - 2))
return FALSE;
return TRUE;
}
static inline gboolean
gst_jpeg_parse_app1 (GstJpegParse * parse, GstByteReader * reader)
{
guint16 size = 0;
const gchar *id_str;
const guint8 *data = NULL;
if (!gst_byte_reader_get_uint16_be (reader, &size))
return FALSE;
size -= 2; /* 2 bytes for the mark */
if (!gst_byte_reader_peek_string_utf8 (reader, &id_str))
return FALSE;
if (!strncmp (id_str, "Exif", 4)) {
/* skip id + NUL + padding */
if (!gst_byte_reader_skip (reader, 6))
return FALSE;
size -= 6;
/* handle exif metadata */
if (!gst_byte_reader_get_data (reader, size, &data))
return FALSE;
extract_and_queue_tags (parse, size, (guint8 *) data,
gst_tag_list_from_exif_buffer_with_tiff_header);
GST_LOG_OBJECT (parse, "parsed marker %x: '%s' %u bytes",
APP1, id_str, size);
} else if (!strncmp (id_str, "http://ns.adobe.com/xap/1.0/", 28)) {
/* skip the id + NUL */
if (!gst_byte_reader_skip (reader, 29))
return FALSE;
size -= 29;
/* handle xmp metadata */
if (!gst_byte_reader_get_data (reader, size, &data))
return FALSE;
extract_and_queue_tags (parse, size, (guint8 *) data,
gst_tag_list_from_xmp_buffer);
GST_LOG_OBJECT (parse, "parsed marker %x: '%s' %u bytes",
APP1, id_str, size);
} else {
if (!gst_jpeg_parse_skip_marker (parse, reader, APP1))
return FALSE;
}
return TRUE;
}
/* Ideas from gstjpegparse.c */
GstTagList *
gst_droidcamsrc_exif_tags_from_jpeg_data (void *data, size_t size)
{
GstByteReader reader;
guint16 len = 0;
const gchar *id;
const guint8 *exif = NULL;
GstBuffer *buff;
GstTagList *tags = NULL;
void *app1 = memmem (data, size, marker, 2);
if (!app1) {
GST_ERROR ("No tags found");
goto out;
}
size -= (app1 - data);
gst_byte_reader_init (&reader, app1, size);
if (!gst_byte_reader_skip (&reader, 2)) {
GST_ERROR ("Not enough jpeg data for tags");
goto out;
}
if (!gst_byte_reader_get_uint16_be (&reader, &len)) {
GST_ERROR ("Failed to get APP1 size");
goto out;
}
len -= 2; /* for the marker itself */
if (!gst_byte_reader_peek_string_utf8 (&reader, &id)) {
goto out;
}
if (!strncmp (id, "Exif", 4)) {
/* id + NUL + padding */
if (!gst_byte_reader_skip (&reader, 6)) {
goto out;
}
len -= 6;
if (!gst_byte_reader_get_data (&reader, len, &exif)) {
goto out;
}
buff =
gst_buffer_new_wrapped_full (GST_MEMORY_FLAG_READONLY, (gpointer) exif,
len, 0, len, NULL, NULL);
tags = gst_tag_list_from_exif_buffer_with_tiff_header (buff);
gst_buffer_unref (buff);
return tags;
}
out:
return NULL;
}
