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tag/Id3Scan: support embedded pictures (the "APIC" tag)

This commit is contained in:
Max Kellermann 2019-08-12 13:39:29 +02:00
parent 96a1c69c29
commit 575ba51931
1 changed files with 42 additions and 0 deletions
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42
src/tag/Id3Scan.cxx
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@ -286,6 +286,47 @@ tag_id3_import_ufid(const struct id3_tag *id3_tag,
}
}
/**
* Handle "APIC" ("attached picture") tags.
*/
static void
tag_id3_handle_apic(const struct id3_tag *id3_tag,
TagHandler &handler) noexcept
{
if (!handler.WantPicture())
return;
for (unsigned i = 0;; ++i) {
const id3_frame *frame = id3_tag_findframe(id3_tag, "APIC", i);
if (frame == nullptr)
break;
id3_field *mime_type_field = id3_frame_field(frame, 1);
if (mime_type_field == nullptr)
continue;
const char *mime_type = (const char *)
id3_field_getlatin1(mime_type_field);
if (mime_type != nullptr &&
StringIsEqual(mime_type, "-->"))
/* this is a URL, not image data */
continue;
id3_field *data_field = id3_frame_field(frame, 4);
if (data_field == nullptr ||
data_field->type != ID3_FIELD_TYPE_BINARYDATA)
continue;
id3_length_t size;
const id3_byte_t *data =
id3_field_getbinarydata(data_field, &size);
if (data == nullptr || size == 0)
continue;
handler.OnPicture(mime_type, {data, size});
}
}
void
scan_id3_tag(const struct id3_tag *tag, TagHandler &handler) noexcept
{
@ -327,6 +368,7 @@ scan_id3_tag(const struct id3_tag *tag, TagHandler &handler) noexcept
tag_id3_import_musicbrainz(tag, handler);
tag_id3_import_ufid(tag, handler);
tag_id3_handle_apic(tag, handler);
}
Tag