+ /* add the channel layout tag */
+ if (codec->channel_layout &&
+ !(codec->channel_layout & ~0x3ffffULL) &&
+ !ff_flac_is_native_layout(codec->channel_layout)) {
+ AVDictionaryEntry *chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK",
+ NULL, 0);
+
+ if (chmask) {
+ av_log(s, AV_LOG_WARNING, "A WAVEFORMATEXTENSIBLE_CHANNEL_MASK is "
+ "already present, this muxer will not overwrite it.\n");
+ } else {
+ uint8_t buf[32];
+ snprintf(buf, sizeof(buf), "0x%"PRIx64, codec->channel_layout);
+ av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
+ }
+ }
+