--- /dev/null
+/* GStreamer non-core tag registration and tag utility functions
+ * Copyright (C) 2005 Ross Burton <ross@burtonini.com>
+ * 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
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gst-i18n-plugin.h>
+#include <gst/base/gsttypefindhelper.h>
+#include <gst/gst.h>
+#include "tag.h"
+
+#include <string.h>
+
+/**
+ * SECTION:gsttag
+ * @short_description: additional tag definitions for plugins and applications
+ * @see_also: #GstTagList
+ *
+ * <refsect2>
+ * <para>
+ * Contains additional standardized GStreamer tag definitions for plugins
+ * and applications, and functions to register them with the GStreamer
+ * tag system.
+ * </para>
+ * </refsect2>
+ */
+
+#ifndef GST_DISABLE_GST_DEBUG
+#define GST_CAT_DEFAULT gst_tag_ensure_debug_category()
+
+static GstDebugCategory *
+gst_tag_ensure_debug_category (void)
+{
+ static gsize cat_gonce = 0;
+
+ if (g_once_init_enter (&cat_gonce)) {
+ GstDebugCategory *cat = NULL;
+
+ GST_DEBUG_CATEGORY_INIT (cat, "tag-tags", 0, "GstTag helper functions");
+
+ g_once_init_leave (&cat_gonce, (gsize) cat);
+ }
+
+ return (GstDebugCategory *) cat_gonce;
+}
+#endif /* GST_DISABLE_GST_DEBUG */
+
+static gpointer
+gst_tag_register_tags_internal (gpointer unused)
+{
+#ifdef ENABLE_NLS
+ GST_DEBUG ("binding text domain %s to locale dir %s", GETTEXT_PACKAGE,
+ LOCALEDIR);
+ bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
+ bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
+#endif
+
+ /* musicbrainz tags */
+ gst_tag_register (GST_TAG_MUSICBRAINZ_TRACKID, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("track ID"), _("MusicBrainz track ID"), NULL);
+ gst_tag_register (GST_TAG_MUSICBRAINZ_ARTISTID, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("artist ID"), _("MusicBrainz artist ID"), NULL);
+ gst_tag_register (GST_TAG_MUSICBRAINZ_ALBUMID, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("album ID"), _("MusicBrainz album ID"), NULL);
+ gst_tag_register (GST_TAG_MUSICBRAINZ_ALBUMARTISTID, GST_TAG_FLAG_META,
+ G_TYPE_STRING,
+ _("album artist ID"), _("MusicBrainz album artist ID"), NULL);
+ gst_tag_register (GST_TAG_MUSICBRAINZ_TRMID, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("track TRM ID"), _("MusicBrainz TRM ID"), NULL);
+
+ /* CDDA tags */
+ gst_tag_register (GST_TAG_CDDA_CDDB_DISCID, GST_TAG_FLAG_META,
+ G_TYPE_STRING, "discid", "CDDB discid for metadata retrieval",
+ gst_tag_merge_use_first);
+
+ gst_tag_register (GST_TAG_CDDA_CDDB_DISCID_FULL, GST_TAG_FLAG_META,
+ G_TYPE_STRING, "discid full",
+ "CDDB discid for metadata retrieval (full)", gst_tag_merge_use_first);
+
+ gst_tag_register (GST_TAG_CDDA_MUSICBRAINZ_DISCID, GST_TAG_FLAG_META,
+ G_TYPE_STRING, "musicbrainz-discid",
+ "Musicbrainz discid for metadata retrieval", gst_tag_merge_use_first);
+
+ gst_tag_register (GST_TAG_CDDA_MUSICBRAINZ_DISCID_FULL, GST_TAG_FLAG_META,
+ G_TYPE_STRING, "musicbrainz-discid-full",
+ "Musicbrainz discid for metadata retrieval (full)",
+ gst_tag_merge_use_first);
+
+ /* photography tags */
+ gst_tag_register (GST_TAG_CAPTURING_SHUTTER_SPEED, GST_TAG_FLAG_META,
+ GST_TYPE_FRACTION, _("capturing shutter speed"),
+ _("Shutter speed used when capturing an image, in seconds"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_FOCAL_RATIO, GST_TAG_FLAG_META,
+ G_TYPE_DOUBLE, _("capturing focal ratio"),
+ _("Focal ratio (f-number) used when capturing the image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_FOCAL_LENGTH, GST_TAG_FLAG_META,
+ G_TYPE_DOUBLE, _("capturing focal length"),
+ _("Focal length of the lens used capturing the image, in mm"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_DIGITAL_ZOOM_RATIO, GST_TAG_FLAG_META,
+ G_TYPE_DOUBLE, _("capturing digital zoom ratio"),
+ _("Digital zoom ratio used when capturing an image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_ISO_SPEED, GST_TAG_FLAG_META,
+ G_TYPE_INT, _("capturing iso speed"),
+ _("The ISO speed used when capturing an image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_EXPOSURE_PROGRAM, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("capturing exposure program"),
+ _("The exposure program used when capturing an image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_EXPOSURE_MODE, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("capturing exposure mode"),
+ _("The exposure mode used when capturing an image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_EXPOSURE_COMPENSATION, GST_TAG_FLAG_META,
+ G_TYPE_DOUBLE, _("capturing exposure compensation"),
+ _("The exposure compensation used when capturing an image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_SCENE_CAPTURE_TYPE, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("capturing scene capture type"),
+ _("The scene capture mode used when capturing an image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_GAIN_ADJUSTMENT, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("capturing gain adjustment"),
+ _("The overall gain adjustment applied on an image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_WHITE_BALANCE, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("capturing white balance"),
+ _("The white balance mode set when capturing an image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_CONTRAST, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("capturing contrast"),
+ _("The direction of contrast processing applied "
+ "when capturing an image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_SATURATION, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("capturing saturation"),
+ _("The direction of saturation processing applied when "
+ "capturing an image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_SHARPNESS, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("capturing sharpness"),
+ _("The direction of sharpness processing applied "
+ "when capturing an image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_FLASH_FIRED, GST_TAG_FLAG_META,
+ G_TYPE_BOOLEAN, _("capturing flash fired"),
+ _("If the flash fired while capturing an image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_FLASH_MODE, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("capturing flash mode"),
+ _("The selected flash mode while capturing an image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_METERING_MODE, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("capturing metering mode"),
+ _("The metering mode used while determining exposure for capturing an"
+ " image"), NULL);
+
+ gst_tag_register (GST_TAG_CAPTURING_SOURCE, GST_TAG_FLAG_META,
+ G_TYPE_STRING, _("capturing source"),
+ _("The source or type of device used for the capture"), NULL);
+
+ gst_tag_register (GST_TAG_IMAGE_HORIZONTAL_PPI, GST_TAG_FLAG_META,
+ G_TYPE_DOUBLE, _("image horizontal ppi"),
+ _("Media (image/video) intended horizontal pixel density in ppi"), NULL);
+
+ gst_tag_register (GST_TAG_IMAGE_VERTICAL_PPI, GST_TAG_FLAG_META,
+ G_TYPE_DOUBLE, _("image vertical ppi"),
+ _("Media (image/video) intended vertical pixel density in ppi"), NULL);
+
+ return NULL;
+}
+
+/* FIXME 0.11: rename this to gst_tag_init() or gst_tag_register_tags() or
+ * even better: make tags auto-register themselves, either by defining them
+ * to a wrapper func that does the initing, or by adding tag factories so
+ * that the core can load+register tags automatically when needed. */
+
+/**
+ * gst_tag_register_musicbrainz_tags
+ *
+ * Registers additional musicbrainz-specific tags with the GStreamer tag
+ * system. Plugins and applications that use these tags should call this
+ * function before using them. Can be called multiple times.
+ */
+void
+gst_tag_register_musicbrainz_tags (void)
+{
+ static GOnce mb_once = G_ONCE_INIT;
+
+ g_once (&mb_once, gst_tag_register_tags_internal, NULL);
+}
+
+static void
+register_tag_image_type_enum (GType * id)
+{
+ static const GEnumValue image_types[] = {
+ {GST_TAG_IMAGE_TYPE_NONE, "GST_TAG_IMAGE_TYPE_NONE", "none"},
+ {GST_TAG_IMAGE_TYPE_UNDEFINED, "GST_TAG_IMAGE_TYPE_UNDEFINED", "undefined"},
+ {GST_TAG_IMAGE_TYPE_FRONT_COVER, "GST_TAG_IMAGE_TYPE_FRONT_COVER",
+ "front-cover"},
+ {GST_TAG_IMAGE_TYPE_BACK_COVER, "GST_TAG_IMAGE_TYPE_BACK_COVER",
+ "back-cover"},
+ {GST_TAG_IMAGE_TYPE_LEAFLET_PAGE, "GST_TAG_IMAGE_TYPE_LEAFLET_PAGE",
+ "leaflet-page"},
+ {GST_TAG_IMAGE_TYPE_MEDIUM, "GST_TAG_IMAGE_TYPE_MEDIUM", "medium"},
+ {GST_TAG_IMAGE_TYPE_LEAD_ARTIST, "GST_TAG_IMAGE_TYPE_LEAD_ARTIST",
+ "lead-artist"},
+ {GST_TAG_IMAGE_TYPE_ARTIST, "GST_TAG_IMAGE_TYPE_ARTIST", "artist"},
+ {GST_TAG_IMAGE_TYPE_CONDUCTOR, "GST_TAG_IMAGE_TYPE_CONDUCTOR", "conductor"},
+ {GST_TAG_IMAGE_TYPE_BAND_ORCHESTRA, "GST_TAG_IMAGE_TYPE_BAND_ORCHESTRA",
+ "band-orchestra"},
+ {GST_TAG_IMAGE_TYPE_COMPOSER, "GST_TAG_IMAGE_TYPE_COMPOSER", "composer"},
+ {GST_TAG_IMAGE_TYPE_LYRICIST, "GST_TAG_IMAGE_TYPE_LYRICIST", "lyricist"},
+ {GST_TAG_IMAGE_TYPE_RECORDING_LOCATION,
+ "GST_TAG_IMAGE_TYPE_RECORDING_LOCATION",
+ "recording-location"},
+ {GST_TAG_IMAGE_TYPE_DURING_RECORDING, "GST_TAG_IMAGE_TYPE_DURING_RECORDING",
+ "during-recording"},
+ {GST_TAG_IMAGE_TYPE_DURING_PERFORMANCE,
+ "GST_TAG_IMAGE_TYPE_DURING_PERFORMANCE",
+ "during-performance"},
+ {GST_TAG_IMAGE_TYPE_VIDEO_CAPTURE, "GST_TAG_IMAGE_TYPE_VIDEO_CAPTURE",
+ "video-capture"},
+ {GST_TAG_IMAGE_TYPE_FISH, "GST_TAG_IMAGE_TYPE_FISH", "fish"},
+ {GST_TAG_IMAGE_TYPE_ILLUSTRATION, "GST_TAG_IMAGE_TYPE_ILLUSTRATION",
+ "illustration"},
+ {GST_TAG_IMAGE_TYPE_BAND_ARTIST_LOGO, "GST_TAG_IMAGE_TYPE_BAND_ARTIST_LOGO",
+ "artist-logo"},
+ {GST_TAG_IMAGE_TYPE_PUBLISHER_STUDIO_LOGO,
+ "GST_TAG_IMAGE_TYPE_PUBLISHER_STUDIO_LOGO",
+ "publisher-studio-logo"},
+ {0, NULL, NULL}
+ };
+
+ *id = g_enum_register_static ("GstTagImageType", image_types);
+
+ /* work around thread-safety issue with class creation in GLib */
+ g_type_class_ref (*id);
+}
+
+GType
+gst_tag_image_type_get_type (void)
+{
+ static GType id;
+
+ static GOnce once = G_ONCE_INIT;
+
+ g_once (&once, (GThreadFunc) register_tag_image_type_enum, &id);
+ 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
+ * @key: return location for the comment description key, or NULL
+ * @lang: return location for the comment ISO-639 language code, or NULL
+ * @value: return location for the actual comment string, or NULL
+ * @fail_if_no_key: whether to fail if strings are not in key=value form
+ *
+ * Convenience function to parse a GST_TAG_EXTENDED_COMMENT string and
+ * separate it into its components.
+ *
+ * If successful, @key, @lang and/or @value will be set to newly allocated
+ * strings that you need to free with g_free() when done. @key and @lang
+ * may also be set to NULL by this function if there is no key or no language
+ * code in the extended comment string.
+ *
+ * Returns: TRUE if the string could be parsed, otherwise FALSE
+ *
+ * Since: 0.10.10
+ */
+gboolean
+gst_tag_parse_extended_comment (const gchar * ext_comment, gchar ** key,
+ gchar ** lang, gchar ** value, gboolean fail_if_no_key)
+{
+ const gchar *div, *bop, *bcl;
+
+ g_return_val_if_fail (ext_comment != NULL, FALSE);
+ g_return_val_if_fail (g_utf8_validate (ext_comment, -1, NULL), FALSE);
+
+ if (key)
+ *key = NULL;
+ if (lang)
+ *lang = NULL;
+
+ div = strchr (ext_comment, '=');
+ bop = strchr (ext_comment, '[');
+ bcl = strchr (ext_comment, ']');
+
+ if (div == NULL) {
+ if (fail_if_no_key)
+ return FALSE;
+ if (value)
+ *value = g_strdup (ext_comment);
+ return TRUE;
+ }
+
+ if (bop != NULL && bop < div) {
+ if (bcl < bop || bcl > div)
+ return FALSE;
+ if (key)
+ *key = g_strndup (ext_comment, bop - ext_comment);
+ if (lang)
+ *lang = g_strndup (bop + 1, bcl - bop - 1);
+ } else {
+ if (key)
+ *key = g_strndup (ext_comment, div - ext_comment);
+ }
+
+ if (value)
+ *value = g_strdup (div + 1);
+
+ return TRUE;
+}
+
+/**
+ * gst_tag_freeform_string_to_utf8:
+ * @data: string data
+ * @size: length of string data, or -1 if the string is NUL-terminated
+ * @env_vars: a NULL-terminated string array of environment variable names,
+ * or NULL
+ *
+ * Convenience function to read a string with unknown character encoding. If
+ * the string is already in UTF-8 encoding, it will be returned right away.
+ * If not it tries to detect byte-order-mark for UTF-16/32 cases and use that.
+ * Otherwise, the environment will be searched for a number of environment
+ * variables (whose names are specified in the NULL-terminated string array
+ * @env_vars) containing a list of character encodings to try/use. If none
+ * are specified, the current locale will be tried. If that also doesn't work,
+ * WINDOWS-1252/ISO-8859-1 is assumed (which will almost always succeed).
+ *
+ * Returns: a newly-allocated string in UTF-8 encoding, or NULL
+ *
+ * Since: 0.10.13
+ */
+gchar *
+gst_tag_freeform_string_to_utf8 (const gchar * data, gint size,
+ const gchar ** env_vars)
+{
+ const gchar *cur_loc = NULL;
+
+ gsize bytes_read;
+
+ gchar *utf8 = NULL;
+
+ g_return_val_if_fail (data != NULL, NULL);
+
+ if (size < 0)
+ size = strlen (data);
+
+ /* chop off trailing string terminators to make sure utf8_validate doesn't
+ * get to see them (since that would make the utf8 check fail) */
+ while (size > 0 && data[size - 1] == '\0')
+ --size;
+
+ /* Should we try the charsets specified
+ * via environment variables FIRST ? */
+ if (g_utf8_validate (data, size, NULL)) {
+ utf8 = g_strndup (data, size);
+ GST_LOG ("String '%s' is valid UTF-8 already", utf8);
+ goto beach;
+ }
+
+ /* check for and use byte-order-mark for UTF-16/32 cases */
+ if (size >= 2) {
+ const gchar *c = NULL;
+ gint prefix, ssize;
+
+ if (size >= 4) {
+ prefix = 4;
+ ssize = GST_ROUND_DOWN_4 (size - 4);
+ switch (GST_READ_UINT32_BE (data)) {
+ case 0x0000FEFF:
+ c = "UTF-32BE";
+ break;
+ case 0xFFFE0000:
+ c = "UTF-32LE";
+ break;
+ default:
+ break;
+ }
+ }
+ if (!c) {
+ prefix = 2;
+ ssize = GST_ROUND_DOWN_2 (size - 2);
+ switch (GST_READ_UINT16_BE (data)) {
+ case 0xFEFF:
+ c = "UTF-16BE";
+ break;
+ case 0xFFFE:
+ c = "UTF-16LE";
+ break;
+ default:
+ break;
+ }
+ }
+ if (c) {
+ GST_LOG ("Trying to convert freeform string to UTF-8 from '%s'", c);
+ if ((utf8 =
+ g_convert (data + prefix, ssize, "UTF-8", c, &bytes_read, NULL,
+ NULL))) {
+ if (bytes_read == ssize)
+ goto beach;
+ g_free (utf8);
+ utf8 = NULL;
+ }
+ }
+ }
+
+ while (env_vars && *env_vars != NULL) {
+ const gchar *env = NULL;
+
+ /* Try charsets specified via the environment */
+ env = g_getenv (*env_vars);
+ if (env != NULL && *env != '\0') {
+ gchar **c, **csets;
+
+ csets = g_strsplit (env, G_SEARCHPATH_SEPARATOR_S, -1);
+
+ for (c = csets; c && *c; ++c) {
+ GST_LOG ("Trying to convert freeform string to UTF-8 from '%s'", *c);
+ if ((utf8 =
+ g_convert (data, size, "UTF-8", *c, &bytes_read, NULL, NULL))) {
+ if (bytes_read == size) {
+ g_strfreev (csets);
+ goto beach;
+ }
+ g_free (utf8);
+ utf8 = NULL;
+ }
+ }
+
+ g_strfreev (csets);
+ }
+ ++env_vars;
+ }
+
+ /* Try current locale (if not UTF-8) */
+ if (!g_get_charset (&cur_loc)) {
+ GST_LOG ("Trying to convert freeform string using locale ('%s')", cur_loc);
+ if ((utf8 = g_locale_to_utf8 (data, size, &bytes_read, NULL, NULL))) {
+ if (bytes_read == size) {
+ goto beach;
+ }
+ g_free (utf8);
+ utf8 = NULL;
+ }
+ }
+
+ /* Try Windows-1252 (which is a superset of ISO 8859-1 that uses a control
+ * character range in ISO 8859-1 for more printable characters) */
+ {
+ GError *err = NULL;
+
+ GST_LOG ("Trying to convert freeform string using Windows-1252/ISO-8859-1 "
+ "fallback");
+ utf8 = g_convert (data, size, "UTF-8", "WINDOWS-1252", &bytes_read, NULL,
+ &err);
+ if (err != NULL) {
+ /* fallback in case iconv implementation doesn't support windows-1252
+ * for some reason */
+ if (err->code == G_CONVERT_ERROR_NO_CONVERSION) {
+ utf8 = g_convert (data, size, "UTF-8", "ISO-8859-1", &bytes_read,
+ NULL, NULL);
+ }
+ g_error_free (err);
+ }
+
+ if (utf8 != NULL && bytes_read == size)
+ goto beach;
+ }
+
+ g_free (utf8);
+ return NULL;
+
+beach:
+
+ g_strchomp (utf8);
+ if (utf8 && utf8[0] != '\0') {
+ GST_LOG ("Returning '%s'", utf8);
+ return utf8;
+ }
+
+ 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';
+
+ /* 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;
+ }
+
+ /* Decrease size by 1 if we don't have an URI list
+ * to keep the original size of the image
+ */
+ if (!g_str_equal (name, "text/uri-list"))
+ GST_BUFFER_SIZE (image) = image_data_len;
+
+ 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 / mafwsubrenderer / blobdiff