[FFmpeg-cvslog] apetag: add support for writing APE tags
Anton Khirnov
git at videolan.org
Wed May 29 10:51:35 CEST 2013
ffmpeg | branch: master | Anton Khirnov <anton at khirnov.net> | Tue May 28 17:43:22 2013 +0200| [88de0c7901ee2bd6021cf32def87ce98ce63155c] | committer: Anton Khirnov
apetag: add support for writing APE tags
This will be useful in the WavPack muxer.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=88de0c7901ee2bd6021cf32def87ce98ce63155c
---
libavformat/apetag.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++
libavformat/apetag.h | 5 +++++
2 files changed, 61 insertions(+)
diff --git a/libavformat/apetag.c b/libavformat/apetag.c
index 0d2cb97..68f2df6 100644
--- a/libavformat/apetag.c
+++ b/libavformat/apetag.c
@@ -23,12 +23,14 @@
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "avformat.h"
+#include "avio_internal.h"
#include "apetag.h"
#include "internal.h"
#define APE_TAG_VERSION 2000
#define APE_TAG_FOOTER_BYTES 32
#define APE_TAG_FLAG_CONTAINS_HEADER (1 << 31)
+#define APE_TAG_FLAG_CONTAINS_FOOTER (1 << 30)
#define APE_TAG_FLAG_IS_HEADER (1 << 29)
#define APE_TAG_FLAG_IS_BINARY (1 << 1)
@@ -169,3 +171,57 @@ int64_t ff_ape_parse_tag(AVFormatContext *s)
return tag_start;
}
+
+int ff_ape_write_tag(AVFormatContext *s)
+{
+ AVDictionaryEntry *e = NULL;
+ int64_t start, end;
+ int size, count = 0;
+
+ if (!s->pb->seekable)
+ return 0;
+
+ start = avio_tell(s->pb);
+
+ // header
+ avio_write(s->pb, "APETAGEX", 8); // id
+ avio_wl32 (s->pb, APE_TAG_VERSION); // version
+ avio_wl32(s->pb, 0); // reserve space for size
+ avio_wl32(s->pb, 0); // reserve space for tag count
+
+ // flags
+ avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_CONTAINS_FOOTER |
+ APE_TAG_FLAG_IS_HEADER);
+ ffio_fill(s->pb, 0, 8); // reserved
+
+ while ((e = av_dict_get(s->metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
+ int val_len = strlen(e->value);
+
+ avio_wl32(s->pb, val_len); // value length
+ avio_wl32(s->pb, 0); // item flags
+ avio_put_str(s->pb, e->key); // key
+ avio_write(s->pb, e->value, val_len); // value
+ count++;
+ }
+
+ size = avio_tell(s->pb) - start;
+
+ // footer
+ avio_write(s->pb, "APETAGEX", 8); // id
+ avio_wl32 (s->pb, APE_TAG_VERSION); // version
+ avio_wl32(s->pb, size); // size
+ avio_wl32(s->pb, count); // tag count
+
+ // flags
+ avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_CONTAINS_FOOTER);
+ ffio_fill(s->pb, 0, 8); // reserved
+
+ // update values in the header
+ end = avio_tell(s->pb);
+ avio_seek(s->pb, start + 12, SEEK_SET);
+ avio_wl32(s->pb, size);
+ avio_wl32(s->pb, count);
+ avio_seek(s->pb, end, SEEK_SET);
+
+ return 0;
+}
diff --git a/libavformat/apetag.h b/libavformat/apetag.h
index 279972f..36e3211 100644
--- a/libavformat/apetag.h
+++ b/libavformat/apetag.h
@@ -32,4 +32,9 @@
*/
int64_t ff_ape_parse_tag(AVFormatContext *s);
+/**
+ * Write an APE tag into a file.
+ */
+int ff_ape_write_tag(AVFormatContext *s);
+
#endif /* AVFORMAT_APETAG_H */
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