/* * ID3v2 header writer * * 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 <stdint.h> #include <string.h> #include "libavutil/avstring.h" #include "libavutil/dict.h" #include "libavutil/intreadwrite.h" #include "avformat.h" #include "avio.h" #include "avio_internal.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 synchsafe */ 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; } static void id3v2_3_metadata_split_date(AVDictionary **pm) { AVDictionaryEntry *mtag = NULL; AVDictionary *dst = NULL; const char *key, *value; char year[5] = {0}, day_month[5] = {0}; int i; while ((mtag = av_dict_get(*pm, "", mtag, AV_DICT_IGNORE_SUFFIX))) { key = mtag->key; if (!av_strcasecmp(key, "date")) { /* split date tag using "YYYY-MM-DD" format into year and month/day segments */ value = mtag->value; i = 0; while (value[i] >= '0' && value[i] <= '9') i++; if (value[i] == '\0' || value[i] == '-') { av_strlcpy(year, value, sizeof(year)); av_dict_set(&dst, "TYER", year, 0); if (value[i] == '-' && value[i+1] >= '0' && value[i+1] <= '1' && value[i+2] >= '0' && value[i+2] <= '9' && value[i+3] == '-' && value[i+4] >= '0' && value[i+4] <= '3' && value[i+5] >= '0' && value[i+5] <= '9' && (value[i+6] == '\0' || value[i+6] == ' ')) { snprintf(day_month, sizeof(day_month), "%.2s%.2s", value + i + 4, value + i + 1); av_dict_set(&dst, "TDAT", day_month, 0); } } else av_dict_set(&dst, key, value, 0); } else av_dict_set(&dst, key, mtag->value, 0); } av_dict_free(pm); *pm = dst; } 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); } static int write_metadata(AVIOContext *pb, AVDictionary **metadata, ID3v2EncContext *id3, int enc) { AVDictionaryEntry *t = NULL; int ret; ff_metadata_conv(metadata, ff_id3v2_34_metadata_conv, NULL); if (id3->version == 3) id3v2_3_metadata_split_date(metadata); else if (id3->version == 4) ff_metadata_conv(metadata, ff_id3v2_4_metadata_conv, NULL); while ((t = av_dict_get(*metadata, "", t, AV_DICT_IGNORE_SUFFIX))) { if ((ret = id3v2_check_write_tag(id3, pb, t, ff_id3v2_tags, enc)) > 0) { id3->len += ret; continue; } if ((ret = id3v2_check_write_tag(id3, 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, pb, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0) return ret; id3->len += ret; } return 0; } static int write_chapter(AVFormatContext *s, ID3v2EncContext *id3, int id, int enc) { const AVRational time_base = {1, 1000}; AVChapter *ch = s->chapters[id]; uint8_t *dyn_buf = NULL; AVIOContext *dyn_bc = NULL; char name[123]; int len, start, end, ret; if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0) goto fail; start = av_rescale_q(ch->start, ch->time_base, time_base); end = av_rescale_q(ch->end, ch->time_base, time_base); snprintf(name, 122, "ch%d", id); id3->len += avio_put_str(dyn_bc, name); avio_wb32(dyn_bc, start); avio_wb32(dyn_bc, end); avio_wb32(dyn_bc, 0xFFFFFFFFu); avio_wb32(dyn_bc, 0xFFFFFFFFu); if ((ret = write_metadata(dyn_bc, &ch->metadata, id3, enc)) < 0) goto fail; len = avio_close_dyn_buf(dyn_bc, &dyn_buf); id3->len += 16 + ID3v2_HEADER_SIZE; avio_wb32(s->pb, MKBETAG('C', 'H', 'A', 'P')); avio_wb32(s->pb, len); avio_wb16(s->pb, 0); avio_write(s->pb, dyn_buf, len); fail: if (dyn_bc && !dyn_buf) avio_close_dyn_buf(dyn_bc, &dyn_buf); av_freep(&dyn_buf); return ret; } int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3) { int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM : ID3v2_ENCODING_UTF8; int i, ret; if ((ret = write_metadata(s->pb, &s->metadata, id3, enc)) < 0) return ret; for (i = 0; i < s->nb_chapters; i++) { if ((ret = write_chapter(s, id3, i, enc)) < 0) return 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->codec->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; /* use UTF16 only for non-ASCII strings */ if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(desc)) enc = ID3v2_ENCODING_ISO8859; /* 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, int padding_bytes) { int64_t cur_pos; if (padding_bytes < 0) padding_bytes = 10; /* The ID3v2.3 specification states that 28 bits are used to represent the * size of the whole tag. Therefore the current size of the tag needs to be * subtracted from the upper limit of 2^28-1 to clip the value correctly. */ /* The minimum of 10 is an arbitrary amount of padding at the end of the tag * to fix cover art display with some software such as iTunes, Traktor, * Serato, Torq. */ padding_bytes = av_clip(padding_bytes, 10, 268435455 - id3->len); ffio_fill(pb, 0, padding_bytes); id3->len += padding_bytes; 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, s->metadata_header_padding); return 0; }