[PATCH 1/2] mp4: add com.apple.iTunes freeform tags

[Johannes Weißl]

This enables Replay Gain with mp4, at least how foobar2000 stores it.
---
mp4.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/mp4.c b/mp4.c
index 4d1d0f5..04814ad 100644
--- a/mp4.c
+++ b/mp4.c
@@ -326,6 +326,7 @@ static int mp4_read_comments(struct input_plugin_data *ip_data,
uint32_t size;*/
#else
const MP4Tags *tags;
+ MP4ItmfItemList* itmf_list;
#endif
GROWING_KEYVALS(c);

@@ -417,6 +418,23 @@ static int mp4_read_comments(struct input_plugin_data *ip_data,

MP4TagsFree(tags);

+ itmf_list = MP4ItmfGetItemsByMeaning(priv->mp4.handle, "com.apple.iTunes", NULL);
+ if (itmf_list) {
+ int i;
+ for (i = 0; i < itmf_list->size; i++) {
+ MP4ItmfItem* item = &itmf_list->elements[i];
+ if (item->dataList.size < 1)
+ continue;
+ if (item->dataList.size > 1)
+ d_print("ignore multiple values for tag %s\n", item->name);
+ else {
+ MP4ItmfData* data = &item->dataList.elements[0];
+ char *val = xstrndup(data->value, data->valueSize);
+ comments_add(&c, item->name, val);
+ }
+ }
+ MP4ItmfItemListFree(itmf_list);
+ }
#endif

keyvals_terminate(&c);