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191e34cd67
Based on patch by Matti Hamalainen (mhamalai<mot>students<punkt>oamk<punkt>) Originally committed as revision 19629 to svn://svn.ffmpeg.org/ffmpeg/trunk
123 lines
3.7 KiB
C
123 lines
3.7 KiB
C
/*
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* APE tag handling
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* Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
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* based upon libdemac from Dave Chapman.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#define ENABLE_DEBUG 0
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#define APE_TAG_VERSION 2000
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#define APE_TAG_FOOTER_BYTES 32
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#define APE_TAG_FLAG_CONTAINS_HEADER (1 << 31)
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#define APE_TAG_FLAG_IS_HEADER (1 << 29)
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static int ape_tag_read_field(AVFormatContext *s)
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{
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ByteIOContext *pb = s->pb;
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uint8_t key[1024], value[1024];
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uint32_t size, flags;
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int i, l, c;
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size = get_le32(pb); /* field size */
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flags = get_le32(pb); /* field flags */
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for (i = 0; i < sizeof(key) - 1; i++) {
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c = get_byte(pb);
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if (c < 0x20 || c > 0x7E)
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break;
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else
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key[i] = c;
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}
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key[i] = 0;
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if (c != 0) {
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av_log(s, AV_LOG_WARNING, "Invalid APE tag key '%s'.\n", key);
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return -1;
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}
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l = FFMIN(size, sizeof(value)-1);
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get_buffer(pb, value, l);
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value[l] = 0;
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url_fskip(pb, size-l);
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if (l < size)
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av_log(s, AV_LOG_WARNING, "Too long '%s' tag was truncated.\n", key);
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av_metadata_set(&s->metadata, key, value);
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return 0;
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}
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void ff_ape_parse_tag(AVFormatContext *s)
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{
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ByteIOContext *pb = s->pb;
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int file_size = url_fsize(pb);
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uint32_t val, fields, tag_bytes;
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uint8_t buf[8];
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int i;
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if (file_size < APE_TAG_FOOTER_BYTES)
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return;
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url_fseek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
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get_buffer(pb, buf, 8); /* APETAGEX */
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if (strncmp(buf, "APETAGEX", 8)) {
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return;
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}
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val = get_le32(pb); /* APE tag version */
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if (val > APE_TAG_VERSION) {
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av_log(s, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION);
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return;
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}
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tag_bytes = get_le32(pb); /* tag size */
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if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) {
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av_log(s, AV_LOG_ERROR, "Tag size is way too big\n");
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return;
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}
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fields = get_le32(pb); /* number of fields */
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if (fields > 65536) {
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av_log(s, AV_LOG_ERROR, "Too many tag fields (%d)\n", fields);
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return;
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}
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val = get_le32(pb); /* flags */
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if (val & APE_TAG_FLAG_IS_HEADER) {
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av_log(s, AV_LOG_ERROR, "APE Tag is a header\n");
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return;
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}
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url_fseek(pb, file_size - tag_bytes, SEEK_SET);
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for (i=0; i<fields; i++)
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if (ape_tag_read_field(s) < 0) break;
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#if ENABLE_DEBUG
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av_log(s, AV_LOG_DEBUG, "\nAPE Tags:\n\n");
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av_log(s, AV_LOG_DEBUG, "title = %s\n", s->title);
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av_log(s, AV_LOG_DEBUG, "author = %s\n", s->author);
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av_log(s, AV_LOG_DEBUG, "copyright = %s\n", s->copyright);
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av_log(s, AV_LOG_DEBUG, "comment = %s\n", s->comment);
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av_log(s, AV_LOG_DEBUG, "album = %s\n", s->album);
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av_log(s, AV_LOG_DEBUG, "year = %d\n", s->year);
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av_log(s, AV_LOG_DEBUG, "track = %d\n", s->track);
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av_log(s, AV_LOG_DEBUG, "genre = %s\n", s->genre);
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#endif
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}
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