mirror of https://git.ffmpeg.org/ffmpeg.git
147 lines
4.3 KiB
C
147 lines
4.3 KiB
C
/*
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* ID3v2 header writer
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 <stdint.h>
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#include "libavutil/dict.h"
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "avio.h"
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#include "id3v2.h"
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static void id3v2_put_size(AVFormatContext *s, int size)
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{
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avio_w8(s->pb, size >> 21 & 0x7f);
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avio_w8(s->pb, size >> 14 & 0x7f);
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avio_w8(s->pb, size >> 7 & 0x7f);
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avio_w8(s->pb, size & 0x7f);
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}
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static int string_is_ascii(const uint8_t *str)
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{
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while (*str && *str < 128) str++;
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return !*str;
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}
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/**
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* Write a text frame with one (normal frames) or two (TXXX frames) strings
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* according to encoding (only UTF-8 or UTF-16+BOM supported).
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* @return number of bytes written or a negative error code.
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*/
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static int id3v2_put_ttag(AVFormatContext *s, const char *str1, const char *str2,
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uint32_t tag, enum ID3v2Encoding enc)
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{
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int len;
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uint8_t *pb;
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int (*put)(AVIOContext*, const char*);
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AVIOContext *dyn_buf;
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if (avio_open_dyn_buf(&dyn_buf) < 0)
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return AVERROR(ENOMEM);
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/* check if the strings are ASCII-only and use UTF16 only if
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* they're not */
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if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(str1) &&
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(!str2 || string_is_ascii(str2)))
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enc = ID3v2_ENCODING_ISO8859;
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avio_w8(dyn_buf, enc);
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if (enc == ID3v2_ENCODING_UTF16BOM) {
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avio_wl16(dyn_buf, 0xFEFF); /* BOM */
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put = avio_put_str16le;
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} else
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put = avio_put_str;
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put(dyn_buf, str1);
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if (str2)
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put(dyn_buf, str2);
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len = avio_close_dyn_buf(dyn_buf, &pb);
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avio_wb32(s->pb, tag);
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id3v2_put_size(s, len);
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avio_wb16(s->pb, 0);
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avio_write(s->pb, pb, len);
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av_freep(&pb);
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return len + ID3v2_HEADER_SIZE;
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}
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static int id3v2_check_write_tag(AVFormatContext *s, AVDictionaryEntry *t, const char table[][4],
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enum ID3v2Encoding enc)
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{
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uint32_t tag;
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int i;
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if (t->key[0] != 'T' || strlen(t->key) != 4)
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return -1;
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tag = AV_RB32(t->key);
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for (i = 0; *table[i]; i++)
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if (tag == AV_RB32(table[i]))
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return id3v2_put_ttag(s, t->value, NULL, tag, enc);
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return -1;
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}
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int ff_id3v2_write(struct AVFormatContext *s, int id3v2_version,
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const char *magic)
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{
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int64_t size_pos, cur_pos;
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AVDictionaryEntry *t = NULL;
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int totlen = 0, enc = id3v2_version == 3 ? ID3v2_ENCODING_UTF16BOM :
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ID3v2_ENCODING_UTF8;
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avio_wb32(s->pb, MKBETAG(magic[0], magic[1], magic[2], id3v2_version));
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avio_w8(s->pb, 0);
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avio_w8(s->pb, 0); /* flags */
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/* reserve space for size */
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size_pos = avio_tell(s->pb);
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avio_wb32(s->pb, 0);
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ff_metadata_conv(&s->metadata, ff_id3v2_34_metadata_conv, NULL);
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if (id3v2_version == 4)
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ff_metadata_conv(&s->metadata, ff_id3v2_4_metadata_conv, NULL);
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while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
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int ret;
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if ((ret = id3v2_check_write_tag(s, t, ff_id3v2_tags, enc)) > 0) {
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totlen += ret;
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continue;
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}
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if ((ret = id3v2_check_write_tag(s, t, id3v2_version == 3 ?
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ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) {
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totlen += ret;
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continue;
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}
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/* unknown tag, write as TXXX frame */
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if ((ret = id3v2_put_ttag(s, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0)
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return ret;
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totlen += ret;
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}
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cur_pos = avio_tell(s->pb);
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avio_seek(s->pb, size_pos, SEEK_SET);
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id3v2_put_size(s, totlen);
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avio_seek(s->pb, cur_pos, SEEK_SET);
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return 0;
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}
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