113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/*
|
|
* 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"
|
|
#include "apetag.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;
|
|
uint32_t size, flags;
|
|
int i, 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;
|
|
}
|
|
if (size >= UINT_MAX)
|
|
return -1;
|
|
value = av_malloc(size+1);
|
|
if (!value)
|
|
return AVERROR_NOMEM;
|
|
get_buffer(pb, value, size);
|
|
value[size] = 0;
|
|
av_metadata_set2(&s->metadata, key, value, AV_METADATA_DONT_STRDUP_VAL);
|
|
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;
|
|
}
|