Move APE tag parsing into separate module.

Based on patch by Matti Hamalainen (mhamalai<mot>students<punkt>oamk<punkt>)

Originally committed as revision 19629 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 122 insertions, 0 deletions

diff --git a/libavformat/apetag.c b/libavformat/apetag.c
new file mode 100644
index 0000000000..435dd3fdcf
--- /dev/null
+++ b/libavformat/apetag.c
@@ -0,0 +1,122 @@
+/*
+ * APE tag handling
+ * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
+ *  based upon libdemac from Dave Chapman.
+ *
+ * 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/intreadwrite.h"
+#include "avformat.h"
+
+#define ENABLE_DEBUG 0
+
+#define APE_TAG_VERSION               2000
+#define APE_TAG_FOOTER_BYTES          32
+#define APE_TAG_FLAG_CONTAINS_HEADER  (1 << 31)
+#define APE_TAG_FLAG_IS_HEADER        (1 << 29)
+
+static int ape_tag_read_field(AVFormatContext *s)
+{
+    ByteIOContext *pb = s->pb;
+    uint8_t key[1024], value[1024];
+    uint32_t size, flags;
+    int i, l, c;
+
+    size = get_le32(pb);  /* field size */
+    flags = get_le32(pb); /* field flags */
+    for (i = 0; i < sizeof(key) - 1; i++) {
+        c = get_byte(pb);
+        if (c < 0x20 || c > 0x7E)
+            break;
+        else
+            key[i] = c;
+    }
+    key[i] = 0;
+    if (c != 0) {
+        av_log(s, AV_LOG_WARNING, "Invalid APE tag key '%s'.\n", key);
+        return -1;
+    }
+    l = FFMIN(size, sizeof(value)-1);
+    get_buffer(pb, value, l);
+    value[l] = 0;
+    url_fskip(pb, size-l);
+    if (l < size)
+        av_log(s, AV_LOG_WARNING, "Too long '%s' tag was truncated.\n", key);
+    av_metadata_set(&s->metadata, key, value);
+    return 0;
+}
+
+void ff_ape_parse_tag(AVFormatContext *s)
+{
+    ByteIOContext *pb = s->pb;
+    int file_size = url_fsize(pb);
+    uint32_t val, fields, tag_bytes;
+    uint8_t buf[8];
+    int i;
+
+    if (file_size < APE_TAG_FOOTER_BYTES)
+        return;
+
+    url_fseek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
+
+    get_buffer(pb, buf, 8);    /* APETAGEX */
+    if (strncmp(buf, "APETAGEX", 8)) {
+        return;
+    }
+
+    val = get_le32(pb);        /* APE tag version */
+    if (val > APE_TAG_VERSION) {
+        av_log(s, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION);
+        return;
+    }
+
+    tag_bytes = get_le32(pb);  /* tag size */
+    if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) {
+        av_log(s, AV_LOG_ERROR, "Tag size is way too big\n");
+        return;
+    }
+
+    fields = get_le32(pb);     /* number of fields */
+    if (fields > 65536) {
+        av_log(s, AV_LOG_ERROR, "Too many tag fields (%d)\n", fields);
+        return;
+    }
+
+    val = get_le32(pb);        /* flags */
+    if (val & APE_TAG_FLAG_IS_HEADER) {
+        av_log(s, AV_LOG_ERROR, "APE Tag is a header\n");
+        return;
+    }
+
+    url_fseek(pb, file_size - tag_bytes, SEEK_SET);
+
+    for (i=0; i<fields; i++)
+        if (ape_tag_read_field(s) < 0) break;
+
+#if ENABLE_DEBUG
+    av_log(s, AV_LOG_DEBUG, "\nAPE Tags:\n\n");
+    av_log(s, AV_LOG_DEBUG, "title     = %s\n", s->title);
+    av_log(s, AV_LOG_DEBUG, "author    = %s\n", s->author);
+    av_log(s, AV_LOG_DEBUG, "copyright = %s\n", s->copyright);
+    av_log(s, AV_LOG_DEBUG, "comment   = %s\n", s->comment);
+    av_log(s, AV_LOG_DEBUG, "album     = %s\n", s->album);
+    av_log(s, AV_LOG_DEBUG, "year      = %d\n", s->year);
+    av_log(s, AV_LOG_DEBUG, "track     = %d\n", s->track);
+    av_log(s, AV_LOG_DEBUG, "genre     = %s\n", s->genre);
+#endif
+}