return NULL;
return genres[id];
}
+
+/**
+ * gst_tag_list_add_id3_image:
+ * @tag_list: a tag list
+ * @image_data: the (encoded) image
+ * @image_data_len: the length of the encoded image data at @image_data
+ * @id3_picture_type: picture type as per the ID3 (v2.4.0) specification for
+ * the APIC frame (0 = unknown/other)
+ *
+ * Adds an image from an ID3 APIC frame (or similar, such as used in FLAC)
+ * to the given tag list. Also see gst_tag_image_data_to_image_buffer() for
+ * more information on image tags in GStreamer.
+ *
+ * Returns: %TRUE if the image was processed, otherwise %FALSE
+ *
+ * Since: 0.10.20
+ */
+gboolean
+gst_tag_list_add_id3_image (GstTagList * tag_list, const guint8 * image_data,
+ guint image_data_len, guint id3_picture_type)
+{
+ GstTagImageType tag_image_type;
+ const gchar *tag_name;
+ GstBuffer *image;
+
+ g_return_val_if_fail (GST_IS_TAG_LIST (tag_list), FALSE);
+ g_return_val_if_fail (image_data != NULL, FALSE);
+ g_return_val_if_fail (image_data_len > 0, FALSE);
+
+ if (id3_picture_type == 0x01 || id3_picture_type == 0x02) {
+ /* file icon for preview. Don't add image-type to caps, since there
+ * is only supposed to be one of these, and the type is already indicated
+ * via the special tag */
+ tag_name = GST_TAG_PREVIEW_IMAGE;
+ tag_image_type = GST_TAG_IMAGE_TYPE_NONE;
+ } else {
+ tag_name = GST_TAG_IMAGE;
+
+ /* Remap the ID3v2 APIC type our ImageType enum */
+ if (id3_picture_type >= 0x3 && id3_picture_type <= 0x14)
+ tag_image_type = (GstTagImageType) (id3_picture_type - 2);
+ else
+ tag_image_type = GST_TAG_IMAGE_TYPE_UNDEFINED;
+ }
+
+ image = gst_tag_image_data_to_image_buffer (image_data, image_data_len,
+ tag_image_type);
+
+ if (image == NULL)
+ return FALSE;
+
+ gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND, tag_name, image, NULL);
+ gst_buffer_unref (image);
+ return TRUE;
+}
/**
* GstTagImageType:
+ * @GST_TAG_IMAGE_TYPE_NONE : No image type. Can be used to
+ * tell functions such as gst_tag_image_data_to_image_buffer() that no
+ * image type should be set. (Since: 0.10.20)
* @GST_TAG_IMAGE_TYPE_UNDEFINED : Undefined/other image type
* @GST_TAG_IMAGE_TYPE_FRONT_COVER : Cover (front)
* @GST_TAG_IMAGE_TYPE_BACK_COVER : Cover (back)
* Since: 0.10.9
*/
typedef enum {
- GST_TAG_IMAGE_TYPE_UNDEFINED,
+ GST_TAG_IMAGE_TYPE_NONE = -1,
+ GST_TAG_IMAGE_TYPE_UNDEFINED = 0,
GST_TAG_IMAGE_TYPE_FRONT_COVER,
GST_TAG_IMAGE_TYPE_BACK_COVER,
GST_TAG_IMAGE_TYPE_LEAFLET_PAGE,
const gchar * id3_user_tag);
G_CONST_RETURN gchar * gst_tag_to_id3_tag (const gchar * gst_tag);
+gboolean gst_tag_list_add_id3_image (GstTagList * tag_list,
+ const guint8 * image_data,
+ guint image_data_len,
+ guint id3_picture_type);
+
/* other tag-related functions */
gboolean gst_tag_parse_extended_comment (const gchar * ext_comment,
gint size,
const gchar ** env_vars);
+GstBuffer * gst_tag_image_data_to_image_buffer (const guint8 * image_data,
+ guint image_data_len,
+ GstTagImageType image_type);
+
/* FIXME 0.11: replace with a more general gst_tag_library_init() */
void gst_tag_register_musicbrainz_tags (void);
/* GStreamer non-core tag registration and tag utility functions
* Copyright (C) 2005 Ross Burton <ross@burtonini.com>
- * Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
+ * Copyright (C) 2006-2008 Tim-Philipp Müller <tim centricular net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
#endif
#include <gst/gst-i18n-plugin.h>
+#include <gst/base/gsttypefindhelper.h>
#include <gst/gst.h>
#include "tag.h"
};
*id = g_enum_register_static ("GstTagImageType", image_types);
+
+ /* work around thread-safety issue with class creation in GLib */
+ g_type_class_ref (*id);
}
GType
return id;
}
+static inline gboolean
+gst_tag_image_type_is_valid (GstTagImageType type)
+{
+ GEnumClass *klass;
+ gboolean res;
+
+ klass = g_type_class_ref (gst_tag_image_type_get_type ());
+ res = (g_enum_get_value (klass, type) != NULL);
+ g_type_class_unref (klass);
+
+ return res;
+}
+
/**
* gst_tag_parse_extended_comment:
* @ext_comment: an extended comment string, see #GST_TAG_EXTENDED_COMMENT
g_free (utf8);
return NULL;
}
+
+/**
+ * gst_tag_image_data_to_image_buffer:
+ * @image_data: the (encoded) image
+ * @image_data_len: the length of the encoded image data at @image_data
+ * @image_type: type of the image, or #GST_TAG_IMAGE_TYPE_UNDEFINED. Pass
+ * #GST_TAG_IMAGE_TYPE_NONE if no image type should be set at all (e.g.
+ * for preview images)
+ *
+ * Helper function for tag-reading plugins to create a #GstBuffer suitable to
+ * add to a #GstTagList as an image tag (such as #GST_TAG_IMAGE or
+ * #GST_TAG_PREVIEW_IMAGE) from the encoded image data and an (optional) image
+ * type.
+ *
+ * Background: cover art and other images in tags are usually stored as a
+ * blob of binary image data, often accompanied by a MIME type or some other
+ * content type string (e.g. 'png', 'jpeg', 'jpg'). Sometimes there is also an
+ * 'image type' to indicate what kind of image this is (e.g. front cover,
+ * back cover, artist, etc.). The image data may also be an URI to the image
+ * rather than the image itself.
+ *
+ * In GStreamer, image tags are #GstBuffer<!-- -->s containing the raw image
+ * data, with the buffer caps describing the content type of the image
+ * (e.g. image/jpeg, image/png, text/uri-list). The buffer caps may contain
+ * an additional 'image-type' field of #GST_TYPE_TAG_IMAGE_TYPE to describe
+ * the type of image (front cover, back cover etc.). #GST_TAG_PREVIEW_IMAGE
+ * tags should not carry an image type, their type is already indicated via
+ * the special tag name.
+ *
+ * This function will do various checks and typefind the encoded image
+ * data (we can't trust the declared mime type).
+ *
+ * Returns: a newly-allocated image buffer for use in tag lists, or NULL
+ *
+ * Since: 0.10.20
+ */
+GstBuffer *
+gst_tag_image_data_to_image_buffer (const guint8 * image_data,
+ guint image_data_len, GstTagImageType image_type)
+{
+ const gchar *name;
+ GstBuffer *image;
+ GstCaps *caps;
+
+ g_return_val_if_fail (image_data != NULL, NULL);
+ g_return_val_if_fail (image_data_len > 0, NULL);
+ g_return_val_if_fail (gst_tag_image_type_is_valid (image_type), NULL);
+
+ GST_DEBUG ("image data len: %u bytes", image_data_len);
+
+ /* allocate space for a NUL terminator for an uri too */
+ image = gst_buffer_try_new_and_alloc (image_data_len + 1);
+ if (image == NULL) {
+ GST_WARNING ("failed to allocate buffer of %d for image", image_data_len);
+ return NULL;
+ }
+
+ memcpy (GST_BUFFER_DATA (image), image_data, image_data_len);
+ GST_BUFFER_DATA (image)[image_data_len] = '\0';
+ GST_BUFFER_SIZE (image) = image_data_len;
+
+ /* Find GStreamer media type, can't trust declared type */
+ caps = gst_type_find_helper_for_buffer (NULL, image, NULL);
+
+ if (caps == NULL)
+ goto no_type;
+
+ GST_DEBUG ("Found GStreamer media type: %" GST_PTR_FORMAT, caps);
+
+ /* sanity check: make sure typefound/declared caps are either URI or image */
+ name = gst_structure_get_name (gst_caps_get_structure (caps, 0));
+
+ if (!g_str_has_prefix (name, "image/") &&
+ !g_str_has_prefix (name, "video/") &&
+ !g_str_equal (name, "text/uri-list")) {
+ GST_DEBUG ("Unexpected image type '%s', ignoring image frame", name);
+ goto error;
+ }
+
+ if (image_type != GST_TAG_IMAGE_TYPE_NONE) {
+ GST_LOG ("Setting image type: %d", image_type);
+ caps = gst_caps_make_writable (caps);
+ gst_caps_set_simple (caps, "image-type", GST_TYPE_TAG_IMAGE_TYPE,
+ image_type, NULL);
+ }
+
+ gst_buffer_set_caps (image, caps);
+ gst_caps_unref (caps);
+ return image;
+
+/* ERRORS */
+no_type:
+ {
+ GST_DEBUG ("Could not determine GStreamer media type, ignoring image");
+ /* fall through */
+ }
+error:
+ {
+ if (image)
+ gst_buffer_unref (image);
+ if (caps)
+ gst_caps_unref (caps);
+ return NULL;
+ }
+}
projects / platform / upstream / gstreamer.git / commitdiff