mirror of
https://git.ffmpeg.org/ffmpeg.git
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75 lines
2 KiB
C
75 lines
2 KiB
C
/*
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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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/**
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* Reads ID3v2 tags from an MP3 file and prints the raw tag names
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* without applying FFmpeg's internal metadata key conversion.
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*/
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#include <stdarg.h>
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#include <stdio.h>
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#include "libavutil/dict.h"
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#include "libavutil/log.h"
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#include "libavformat/avformat.h"
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#include "libavformat/id3v2.h"
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static void log_to_stdout(void *avcl, int level, const char *fmt, va_list vl)
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{
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if (level <= av_log_get_level())
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vprintf(fmt, vl);
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}
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int main(int argc, char *argv[])
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{
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AVFormatContext *s;
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ID3v2ExtraMeta *extra_meta = NULL;
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const AVDictionaryEntry *tag = NULL;
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int ret;
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av_log_set_callback(log_to_stdout);
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if (argc < 2) {
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fprintf(stderr, "Usage: %s <file>\n", argv[0]);
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return 1;
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}
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s = avformat_alloc_context();
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if (!s)
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return 1;
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s->debug |= AV_FDEBUG_ID3V2;
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ret = avio_open(&s->pb, argv[1], AVIO_FLAG_READ);
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if (ret < 0) {
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fprintf(stderr, "Failed to open '%s'\n", argv[1]);
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avformat_free_context(s);
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return 1;
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}
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ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &extra_meta, 0);
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while ((tag = av_dict_iterate(s->metadata, tag)))
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printf("%s=%s\n", tag->key, tag->value);
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ff_id3v2_free_extra_meta(&extra_meta);
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avio_closep(&s->pb);
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avformat_free_context(s);
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return 0;
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}
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