/* * ID3v2 header writer * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include #include "libavutil/avstring.h" #include "libavutil/dict.h" #include "libavutil/intreadwrite.h" #include "avformat.h" #include "avio.h" #include "id3v2.h" static void id3v2_put_size(AVIOContext *pb, int size) { avio_w8(pb, size >> 21 & 0x7f); avio_w8(pb, size >> 14 & 0x7f); avio_w8(pb, size >> 7 & 0x7f); avio_w8(pb, size & 0x7f); } static int string_is_ascii(const uint8_t *str) { while (*str && *str < 128) str++; return !*str; } static void id3v2_encode_string(AVIOContext *pb, const uint8_t *str, enum ID3v2Encoding enc) { int (*put)(AVIOContext*, const char*); if (enc == ID3v2_ENCODING_UTF16BOM) { avio_wl16(pb, 0xFEFF); /* BOM */ put = avio_put_str16le; } else put = avio_put_str; put(pb, str); } /** * Write a text frame with one (normal frames) or two (TXXX frames) strings * according to encoding (only UTF-8 or UTF-16+BOM supported). * @return number of bytes written or a negative error code. */ static int id3v2_put_ttag(ID3v2EncContext *id3, AVIOContext *avioc, const char *str1, const char *str2, uint32_t tag, enum ID3v2Encoding enc) { int len; uint8_t *pb; AVIOContext *dyn_buf; if (avio_open_dyn_buf(&dyn_buf) < 0) return AVERROR(ENOMEM); /* check if the strings are ASCII-only and use UTF16 only if * they're not */ if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(str1) && (!str2 || string_is_ascii(str2))) enc = ID3v2_ENCODING_ISO8859; avio_w8(dyn_buf, enc); id3v2_encode_string(dyn_buf, str1, enc); if (str2) id3v2_encode_string(dyn_buf, str2, enc); len = avio_close_dyn_buf(dyn_buf, &pb); avio_wb32(avioc, tag); /* ID3v2.3 frame size is not sync-safe */ if (id3->version == 3) avio_wb32(avioc, len); else id3v2_put_size(avioc, len); avio_wb16(avioc, 0); avio_write(avioc, pb, len); av_freep(&pb); return len + ID3v2_HEADER_SIZE; } static int id3v2_check_write_tag(ID3v2EncContext *id3, AVIOContext *pb, AVDictionaryEntry *t, const char table[][4], enum ID3v2Encoding enc) { uint32_t tag; int i; if (t->key[0] != 'T' || strlen(t->key) != 4) return -1; tag = AV_RB32(t->key); for (i = 0; *table[i]; i++) if (tag == AV_RB32(table[i])) return id3v2_put_ttag(id3, pb, t->value, NULL, tag, enc); return -1; } void ff_id3v2_start(ID3v2EncContext *id3, AVIOContext *pb, int id3v2_version, const char *magic) { id3->version = id3v2_version; avio_wb32(pb, MKBETAG(magic[0], magic[1], magic[2], id3v2_version)); avio_w8(pb, 0); avio_w8(pb, 0); /* flags */ /* reserve space for size */ id3->size_pos = avio_tell(pb); avio_wb32(pb, 0); } int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3) { AVDictionaryEntry *t = NULL; int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM : ID3v2_ENCODING_UTF8; ff_metadata_conv(&s->metadata, ff_id3v2_34_metadata_conv, NULL); if (id3->version == 4) ff_metadata_conv(&s->metadata, ff_id3v2_4_metadata_conv, NULL); while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) { int ret; if ((ret = id3v2_check_write_tag(id3, s->pb, t, ff_id3v2_tags, enc)) > 0) { id3->len += ret; continue; } if ((ret = id3v2_check_write_tag(id3, s->pb, t, id3->version == 3 ? ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) { id3->len += ret; continue; } /* unknown tag, write as TXXX frame */ if ((ret = id3v2_put_ttag(id3, s->pb, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0) return ret; id3->len += ret; } return 0; } int ff_id3v2_write_apic(AVFormatContext *s, ID3v2EncContext *id3, AVPacket *pkt) { AVStream *st = s->streams[pkt->stream_index]; AVDictionaryEntry *e; AVIOContext *dyn_buf; uint8_t *buf; const CodecMime *mime = ff_id3v2_mime_tags; const char *mimetype = NULL, *desc = ""; int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM : ID3v2_ENCODING_UTF8; int i, len, type = 0; /* get the mimetype*/ while (mime->id != AV_CODEC_ID_NONE) { if (mime->id == st->codecpar->codec_id) { mimetype = mime->str; break; } mime++; } if (!mimetype) { av_log(s, AV_LOG_ERROR, "No mimetype is known for stream %d, cannot " "write an attached picture.\n", st->index); return AVERROR(EINVAL); } /* get the picture type */ e = av_dict_get(st->metadata, "comment", NULL, 0); for (i = 0; e && i < FF_ARRAY_ELEMS(ff_id3v2_picture_types); i++) { if (!av_strcasecmp(e->value, ff_id3v2_picture_types[i])) { type = i; break; } } /* get the description */ if ((e = av_dict_get(st->metadata, "title", NULL, 0))) desc = e->value; /* start writing */ if (avio_open_dyn_buf(&dyn_buf) < 0) return AVERROR(ENOMEM); avio_w8(dyn_buf, enc); avio_put_str(dyn_buf, mimetype); avio_w8(dyn_buf, type); id3v2_encode_string(dyn_buf, desc, enc); avio_write(dyn_buf, pkt->data, pkt->size); len = avio_close_dyn_buf(dyn_buf, &buf); avio_wb32(s->pb, MKBETAG('A', 'P', 'I', 'C')); if (id3->version == 3) avio_wb32(s->pb, len); else id3v2_put_size(s->pb, len); avio_wb16(s->pb, 0); avio_write(s->pb, buf, len); av_freep(&buf); id3->len += len + ID3v2_HEADER_SIZE; return 0; } void ff_id3v2_finish(ID3v2EncContext *id3, AVIOContext *pb) { int64_t cur_pos = avio_tell(pb); avio_seek(pb, id3->size_pos, SEEK_SET); id3v2_put_size(pb, id3->len); avio_seek(pb, cur_pos, SEEK_SET); } int ff_id3v2_write_simple(struct AVFormatContext *s, int id3v2_version, const char *magic) { ID3v2EncContext id3 = { 0 }; int ret; ff_id3v2_start(&id3, s->pb, id3v2_version, magic); if ((ret = ff_id3v2_write_metadata(s, &id3)) < 0) return ret; ff_id3v2_finish(&id3, s->pb); return 0; }