+/**
+ * Convert win32 FILETIME to ISO-8601 string
+ */
+static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
+{
+ time_t t = (value / 10000000LL) - 11644473600LL;
+ strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
+}
+
+/**
+ * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
+ */
+static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
+{
+ time_t t = (value / 10000000LL) - 719162LL*86400LL;
+ strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
+}
+
+/**
+ * Convert OLE DATE to ISO-8601 string
+ */
+static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
+{
+ time_t t = 631112400LL + 86400*av_int2double(value);
+ strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
+}
+
+static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
+{
+ char mime[1024];
+ char description[1024];
+ unsigned int filesize;
+ AVStream *st;
+ int64_t pos = avio_tell(pb);
+
+ avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
+ if (strcmp(mime, "image/jpeg"))
+ goto done;
+
+ avio_r8(pb);
+ avio_get_str16le(pb, INT_MAX, description, sizeof(description));
+ filesize = avio_rl32(pb);
+ if (!filesize)
+ goto done;
+
+ st = avformat_new_stream(s, NULL);
+ if (!st)
+ goto done;
+ av_dict_set(&st->metadata, "title", description, 0);
+ st->codec->codec_id = CODEC_ID_MJPEG;
+ st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
+ st->codec->extradata = av_mallocz(filesize);
+ if (!st->codec->extradata)
+ goto done;
+ st->codec->extradata_size = filesize;
+ avio_read(pb, st->codec->extradata, filesize);
+done:
+ avio_seek(pb, pos + length, SEEK_SET);
+}
+
+static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
+{
+ int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
+ char *buf = av_malloc(buf_size);
+ if (!buf)
+ return;
+
+ if (type == 0 && length == 4) {
+ snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
+ } else if (type == 1) {
+ avio_get_str16le(pb, length, buf, buf_size);
+ if (!strlen(buf)) {
+ av_free(buf);
+ return;
+ }
+ } else if (type == 3 && length == 4) {
+ strcpy(buf, avio_rl32(pb) ? "true" : "false");
+ } else if (type == 4 && length == 8) {
+ int64_t num = avio_rl64(pb);
+ if (!strcmp(key, "WM/EncodingTime") ||
+ !strcmp(key, "WM/MediaOriginalBroadcastDateTime"))
+ filetime_to_iso8601(buf, buf_size, num);
+ else if (!strcmp(key, "WM/WMRVEncodeTime") ||
+ !strcmp(key, "WM/WMRVEndTime"))
+ crazytime_to_iso8601(buf, buf_size, num);
+ else if (!strcmp(key, "WM/WMRVExpirationDate"))
+ oledate_to_iso8601(buf, buf_size, num);
+ else if (!strcmp(key, "WM/WMRVBitrate"))
+ snprintf(buf, buf_size, "%f", av_int2double(num));
+ else
+ snprintf(buf, buf_size, "%"PRIi64, num);
+ } else if (type == 5 && length == 2) {
+ snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
+ } else if (type == 6 && length == 16) {
+ ff_asf_guid guid;
+ avio_read(pb, guid, 16);
+ snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
+ } else if (type == 2 && !strcmp(key, "WM/Picture")) {
+ get_attachment(s, pb, length);
+ av_freep(&buf);
+ return;
+ } else {
+ av_freep(&buf);
+ av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
+ avio_skip(pb, length);
+ return;
+ }
+
+ av_dict_set(&s->metadata, key, buf, 0);
+ av_freep(&buf);
+}
+
+/**
+ * Parse metadata entries
+ */
+static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
+{
+ ff_asf_guid guid;
+ int length, type;
+ while(!pb->eof_reached) {
+ char key[1024];
+ ff_get_guid(pb, &guid);
+ type = avio_rl32(pb);
+ length = avio_rl32(pb);
+ if (!length)
+ break;
+ if (ff_guidcmp(&guid, metadata_guid)) {
+ av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
+ "remaining metadata entries ignored\n", ARG_GUID(guid));
+ break;
+ }
+ avio_get_str16le(pb, INT_MAX, key, sizeof(key));
+ get_tag(s, pb, key, type, length);
+ }
+
+ ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
+}
+