APE tag writer

1 files changed, 69 insertions, 0 deletions

diff --git a/libavformat/apetagenc.c b/libavformat/apetagenc.c
new file mode 100644
index 0000000000..3fbcad1e13
--- /dev/null
+++ b/libavformat/apetagenc.c
@@ -0,0 +1,69 @@
+/*
+ * APE tag writer
+ * Copyright (c) 2012 Paul B Mahol
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/dict.h"
+#include "avio_internal.h"
+#include "avformat.h"
+#include "apetag.h"
+
+#define APE_TAG_PREAMBLE        "APETAGEX"
+#define APE_TAG_VERSION         2000
+#define APE_TAG_FOOTER_BYTES    32
+
+static int string_is_ascii(const uint8_t *str)
+{
+    while (*str && *str >= 0x20 && *str <= 0x7e ) str++;
+    return !*str;
+}
+
+void ff_ape_write(AVFormatContext *s)
+{
+    int64_t tag_bytes;
+    AVDictionaryEntry *t = NULL;
+    AVIOContext *pb = s->pb;
+    int tags = 0, vlen;
+
+    tag_bytes = avio_tell(s->pb);
+    while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
+        if (!string_is_ascii(t->key)) {
+            av_log(s, AV_LOG_WARNING, "Non ASCII keys are not allowed\n");
+            continue;
+        }
+
+        vlen = strlen(t->value);
+        avio_wl32(pb, vlen + 1);
+        avio_wl32(pb, 0); // flags
+        avio_put_str(pb, t->key);
+        avio_put_str(pb, t->value);
+        tags++;
+    }
+    tag_bytes = avio_tell(s->pb) - tag_bytes;
+
+    if (!tags)
+        return;
+
+    avio_write(pb, APE_TAG_PREAMBLE, 8);
+    avio_wl32(pb, APE_TAG_VERSION);
+    avio_wl32(pb, tag_bytes + APE_TAG_FOOTER_BYTES);
+    avio_wl32(pb, tags); // item count
+    avio_wl32(pb, 0); // global flags
+    ffio_fill(pb, 0, 8); // reserved
+}