| /* |
| * 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 "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(AVFormatContext *s, int size) |
| { |
| avio_w8(s->pb, size >> 21 & 0x7f); |
| avio_w8(s->pb, size >> 14 & 0x7f); |
| avio_w8(s->pb, size >> 7 & 0x7f); |
| avio_w8(s->pb, size & 0x7f); |
| } |
| |
| static int string_is_ascii(const uint8_t *str) |
| { |
| while (*str && *str < 128) str++; |
| return !*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(AVFormatContext *s, const char *str1, const char *str2, |
| uint32_t tag, enum ID3v2Encoding enc) |
| { |
| int len; |
| uint8_t *pb; |
| int (*put)(AVIOContext*, const char*); |
| 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); |
| if (enc == ID3v2_ENCODING_UTF16BOM) { |
| avio_wl16(dyn_buf, 0xFEFF); /* BOM */ |
| put = avio_put_str16le; |
| } else |
| put = avio_put_str; |
| |
| put(dyn_buf, str1); |
| if (str2) |
| put(dyn_buf, str2); |
| len = avio_close_dyn_buf(dyn_buf, &pb); |
| |
| avio_wb32(s->pb, tag); |
| id3v2_put_size(s, len); |
| avio_wb16(s->pb, 0); |
| avio_write(s->pb, pb, len); |
| |
| av_freep(&pb); |
| return len + ID3v2_HEADER_SIZE; |
| } |
| |
| static int id3v2_check_write_tag(AVFormatContext *s, 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(s, 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; |
| } |
| |
| int ff_id3v2_write(struct AVFormatContext *s, int id3v2_version, |
| const char *magic) |
| { |
| int64_t size_pos, cur_pos; |
| AVDictionaryEntry *t = NULL; |
| |
| int totlen = 0, enc = id3v2_version == 3 ? ID3v2_ENCODING_UTF16BOM : |
| ID3v2_ENCODING_UTF8; |
| |
| |
| avio_wb32(s->pb, MKBETAG(magic[0], magic[1], magic[2], id3v2_version)); |
| avio_w8(s->pb, 0); |
| avio_w8(s->pb, 0); /* flags */ |
| |
| /* reserve space for size */ |
| size_pos = avio_tell(s->pb); |
| avio_wb32(s->pb, 0); |
| |
| ff_metadata_conv(&s->metadata, ff_id3v2_34_metadata_conv, NULL); |
| if (id3v2_version == 3) |
| id3v2_3_metadata_split_date(&s->metadata); |
| else if (id3v2_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(s, t, ff_id3v2_tags, enc)) > 0) { |
| totlen += ret; |
| continue; |
| } |
| if ((ret = id3v2_check_write_tag(s, t, id3v2_version == 3 ? |
| ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) { |
| totlen += ret; |
| continue; |
| } |
| |
| /* unknown tag, write as TXXX frame */ |
| if ((ret = id3v2_put_ttag(s, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0) |
| return ret; |
| totlen += ret; |
| } |
| |
| cur_pos = avio_tell(s->pb); |
| avio_seek(s->pb, size_pos, SEEK_SET); |
| id3v2_put_size(s, totlen); |
| avio_seek(s->pb, cur_pos, SEEK_SET); |
| return 0; |
| } |