456 lines
13 KiB
C
Executable file
456 lines
13 KiB
C
Executable file
/*
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* ID3v2 header writer
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*
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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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#include <stdint.h>
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#include <string.h>
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#include "libavutil/avstring.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 "avio_internal.h"
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#include "id3v2.h"
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static void id3v2_put_size(AVIOContext *pb, int size)
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{
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avio_w8(pb, size >> 21 & 0x7f);
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avio_w8(pb, size >> 14 & 0x7f);
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avio_w8(pb, size >> 7 & 0x7f);
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avio_w8(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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static void id3v2_encode_string(AVIOContext *pb, const uint8_t *str,
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enum ID3v2Encoding enc)
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{
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int (*put)(AVIOContext*, const char*);
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if (enc == ID3v2_ENCODING_UTF16BOM) {
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avio_wl16(pb, 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(pb, 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(ID3v2EncContext *id3, AVIOContext *avioc, 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, ret;
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uint8_t *pb;
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AVIOContext *dyn_buf;
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if ((ret = avio_open_dyn_buf(&dyn_buf)) < 0)
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return ret;
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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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id3v2_encode_string(dyn_buf, str1, enc);
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if (str2)
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id3v2_encode_string(dyn_buf, str2, enc);
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len = avio_get_dyn_buf(dyn_buf, &pb);
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avio_wb32(avioc, tag);
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/* ID3v2.3 frame size is not sync-safe */
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if (id3->version == 3)
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avio_wb32(avioc, len);
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else
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id3v2_put_size(avioc, len);
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avio_wb16(avioc, 0);
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avio_write(avioc, pb, len);
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ffio_free_dyn_buf(&dyn_buf);
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return len + ID3v2_HEADER_SIZE;
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}
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/**
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* Write a priv frame with owner and data. 'key' is the owner prepended with
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* ID3v2_PRIV_METADATA_PREFIX. 'data' is provided as a string. Any \xXX
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* (where 'X' is a valid hex digit) will be unescaped to the byte value.
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*/
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static int id3v2_put_priv(ID3v2EncContext *id3, AVIOContext *avioc, const char *key, const char *data)
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{
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int len, ret;
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uint8_t *pb;
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AVIOContext *dyn_buf;
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if (!av_strstart(key, ID3v2_PRIV_METADATA_PREFIX, &key)) {
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return 0;
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}
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if ((ret = avio_open_dyn_buf(&dyn_buf)) < 0)
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return ret;
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// owner + null byte.
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avio_write(dyn_buf, key, strlen(key) + 1);
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while (*data) {
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if (av_strstart(data, "\\x", &data)) {
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if (data[0] && data[1] && av_isxdigit(data[0]) && av_isxdigit(data[1])) {
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char digits[] = {data[0], data[1], 0};
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avio_w8(dyn_buf, strtol(digits, NULL, 16));
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data += 2;
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} else {
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ffio_free_dyn_buf(&dyn_buf);
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av_log(avioc, AV_LOG_ERROR, "Invalid escape '\\x%.2s' in metadata tag '"
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ID3v2_PRIV_METADATA_PREFIX "%s'.\n", data, key);
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return AVERROR(EINVAL);
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}
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} else {
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avio_write(dyn_buf, data++, 1);
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}
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}
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len = avio_get_dyn_buf(dyn_buf, &pb);
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avio_wb32(avioc, MKBETAG('P', 'R', 'I', 'V'));
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if (id3->version == 3)
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avio_wb32(avioc, len);
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else
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id3v2_put_size(avioc, len);
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avio_wb16(avioc, 0);
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avio_write(avioc, pb, len);
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ffio_free_dyn_buf(&dyn_buf);
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return len + ID3v2_HEADER_SIZE;
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}
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static int id3v2_check_write_tag(ID3v2EncContext *id3, AVIOContext *pb, AVDictionaryEntry *t,
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const char table[][4], 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(id3, pb, t->value, NULL, tag, enc);
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return -1;
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}
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static void id3v2_3_metadata_split_date(AVDictionary **pm)
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{
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AVDictionaryEntry *mtag = NULL;
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AVDictionary *dst = NULL;
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const char *key, *value;
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char year[5] = {0}, day_month[5] = {0};
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int i;
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while ((mtag = av_dict_get(*pm, "", mtag, AV_DICT_IGNORE_SUFFIX))) {
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key = mtag->key;
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if (!av_strcasecmp(key, "date")) {
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/* split date tag using "YYYY-MM-DD" format into year and month/day segments */
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value = mtag->value;
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i = 0;
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while (value[i] >= '0' && value[i] <= '9') i++;
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if (value[i] == '\0' || value[i] == '-') {
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av_strlcpy(year, value, sizeof(year));
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av_dict_set(&dst, "TYER", year, 0);
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if (value[i] == '-' &&
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value[i+1] >= '0' && value[i+1] <= '1' &&
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value[i+2] >= '0' && value[i+2] <= '9' &&
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value[i+3] == '-' &&
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value[i+4] >= '0' && value[i+4] <= '3' &&
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value[i+5] >= '0' && value[i+5] <= '9' &&
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(value[i+6] == '\0' || value[i+6] == ' ')) {
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snprintf(day_month, sizeof(day_month), "%.2s%.2s", value + i + 4, value + i + 1);
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av_dict_set(&dst, "TDAT", day_month, 0);
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}
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} else
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av_dict_set(&dst, key, value, 0);
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} else
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av_dict_set(&dst, key, mtag->value, 0);
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}
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av_dict_free(pm);
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*pm = dst;
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}
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void ff_id3v2_start(ID3v2EncContext *id3, AVIOContext *pb, int id3v2_version,
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const char *magic)
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{
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id3->version = id3v2_version;
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avio_wb32(pb, MKBETAG(magic[0], magic[1], magic[2], id3v2_version));
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avio_w8(pb, 0);
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avio_w8(pb, 0); /* flags */
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/* reserve space for size */
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id3->size_pos = avio_tell(pb);
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avio_wb32(pb, 0);
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}
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static int write_metadata(AVIOContext *pb, AVDictionary **metadata,
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ID3v2EncContext *id3, int enc)
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{
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AVDictionaryEntry *t = NULL;
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int ret;
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ff_metadata_conv(metadata, ff_id3v2_34_metadata_conv, NULL);
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if (id3->version == 3)
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id3v2_3_metadata_split_date(metadata);
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else if (id3->version == 4)
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ff_metadata_conv(metadata, ff_id3v2_4_metadata_conv, NULL);
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while ((t = av_dict_get(*metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
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if ((ret = id3v2_check_write_tag(id3, pb, t, ff_id3v2_tags, enc)) > 0) {
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id3->len += ret;
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continue;
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}
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if ((ret = id3v2_check_write_tag(id3, pb, t, id3->version == 3 ?
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ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) {
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id3->len += ret;
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continue;
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}
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if ((ret = id3v2_put_priv(id3, pb, t->key, t->value)) > 0) {
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id3->len += ret;
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continue;
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} else if (ret < 0) {
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return ret;
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}
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/* unknown tag, write as TXXX frame */
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if ((ret = id3v2_put_ttag(id3, pb, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0)
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return ret;
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id3->len += ret;
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}
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return 0;
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}
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static int write_ctoc(AVFormatContext *s, ID3v2EncContext *id3, int enc)
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{
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uint8_t *dyn_buf;
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AVIOContext *dyn_bc;
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char name[123];
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int len, ret;
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if (s->nb_chapters == 0)
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return 0;
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if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
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return ret;
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avio_put_str(dyn_bc, "toc");
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avio_w8(dyn_bc, 0x03);
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avio_w8(dyn_bc, s->nb_chapters);
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for (int i = 0; i < s->nb_chapters; i++) {
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snprintf(name, 122, "ch%d", i);
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avio_put_str(dyn_bc, name);
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}
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len = avio_get_dyn_buf(dyn_bc, &dyn_buf);
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id3->len += len + ID3v2_HEADER_SIZE;
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avio_wb32(s->pb, MKBETAG('C', 'T', 'O', 'C'));
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avio_wb32(s->pb, len);
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avio_wb16(s->pb, 0);
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avio_write(s->pb, dyn_buf, len);
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ffio_free_dyn_buf(&dyn_bc);
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return ret;
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}
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static int write_chapter(AVFormatContext *s, ID3v2EncContext *id3, int id, int enc)
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{
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const AVRational time_base = {1, 1000};
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AVChapter *ch = s->chapters[id];
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uint8_t *dyn_buf;
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AVIOContext *dyn_bc;
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char name[123];
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int len, start, end, ret;
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if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
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return ret;
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start = av_rescale_q(ch->start, ch->time_base, time_base);
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end = av_rescale_q(ch->end, ch->time_base, time_base);
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snprintf(name, 122, "ch%d", id);
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id3->len += avio_put_str(dyn_bc, name);
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avio_wb32(dyn_bc, start);
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avio_wb32(dyn_bc, end);
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avio_wb32(dyn_bc, 0xFFFFFFFFu);
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avio_wb32(dyn_bc, 0xFFFFFFFFu);
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if ((ret = write_metadata(dyn_bc, &ch->metadata, id3, enc)) < 0)
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goto fail;
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len = avio_get_dyn_buf(dyn_bc, &dyn_buf);
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id3->len += 16 + ID3v2_HEADER_SIZE;
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avio_wb32(s->pb, MKBETAG('C', 'H', 'A', 'P'));
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avio_wb32(s->pb, len);
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avio_wb16(s->pb, 0);
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avio_write(s->pb, dyn_buf, len);
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fail:
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ffio_free_dyn_buf(&dyn_bc);
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return ret;
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}
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int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3)
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{
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int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM :
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ID3v2_ENCODING_UTF8;
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int i, ret;
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ff_standardize_creation_time(s);
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if ((ret = write_metadata(s->pb, &s->metadata, id3, enc)) < 0)
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return ret;
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if ((ret = write_ctoc(s, id3, enc)) < 0)
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return ret;
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for (i = 0; i < s->nb_chapters; i++) {
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if ((ret = write_chapter(s, id3, i, enc)) < 0)
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return ret;
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}
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return 0;
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}
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int ff_id3v2_write_apic(AVFormatContext *s, ID3v2EncContext *id3, AVPacket *pkt)
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{
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AVStream *st = s->streams[pkt->stream_index];
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AVDictionaryEntry *e;
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AVIOContext *dyn_buf;
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uint8_t *buf;
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const CodecMime *mime = ff_id3v2_mime_tags;
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const char *mimetype = NULL, *desc = "";
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int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM :
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ID3v2_ENCODING_UTF8;
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int i, len, type = 0, ret;
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/* get the mimetype*/
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while (mime->id != AV_CODEC_ID_NONE) {
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if (mime->id == st->codecpar->codec_id) {
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mimetype = mime->str;
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break;
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}
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mime++;
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}
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if (!mimetype) {
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av_log(s, AV_LOG_ERROR, "No mimetype is known for stream %d, cannot "
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"write an attached picture.\n", st->index);
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return AVERROR(EINVAL);
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}
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/* get the picture type */
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e = av_dict_get(st->metadata, "comment", NULL, 0);
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for (i = 0; e && i < FF_ARRAY_ELEMS(ff_id3v2_picture_types); i++) {
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if (!av_strcasecmp(e->value, ff_id3v2_picture_types[i])) {
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type = i;
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break;
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}
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}
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/* get the description */
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if ((e = av_dict_get(st->metadata, "title", NULL, 0)))
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desc = e->value;
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/* use UTF16 only for non-ASCII strings */
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if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(desc))
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enc = ID3v2_ENCODING_ISO8859;
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/* start writing */
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if ((ret = avio_open_dyn_buf(&dyn_buf)) < 0)
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return ret;
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avio_w8(dyn_buf, enc);
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avio_put_str(dyn_buf, mimetype);
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avio_w8(dyn_buf, type);
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id3v2_encode_string(dyn_buf, desc, enc);
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avio_write(dyn_buf, pkt->data, pkt->size);
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len = avio_get_dyn_buf(dyn_buf, &buf);
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avio_wb32(s->pb, MKBETAG('A', 'P', 'I', 'C'));
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if (id3->version == 3)
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avio_wb32(s->pb, len);
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else
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id3v2_put_size(s->pb, len);
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avio_wb16(s->pb, 0);
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avio_write(s->pb, buf, len);
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ffio_free_dyn_buf(&dyn_buf);
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id3->len += len + ID3v2_HEADER_SIZE;
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return 0;
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}
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void ff_id3v2_finish(ID3v2EncContext *id3, AVIOContext *pb,
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int padding_bytes)
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{
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int64_t cur_pos;
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if (padding_bytes < 0)
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padding_bytes = 10;
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/* The ID3v2.3 specification states that 28 bits are used to represent the
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* size of the whole tag. Therefore the current size of the tag needs to be
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* subtracted from the upper limit of 2^28-1 to clip the value correctly. */
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/* The minimum of 10 is an arbitrary amount of padding at the end of the tag
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* to fix cover art display with some software such as iTunes, Traktor,
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* Serato, Torq. */
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padding_bytes = av_clip(padding_bytes, 10, 268435455 - id3->len);
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ffio_fill(pb, 0, padding_bytes);
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id3->len += padding_bytes;
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cur_pos = avio_tell(pb);
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avio_seek(pb, id3->size_pos, SEEK_SET);
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id3v2_put_size(pb, id3->len);
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avio_seek(pb, cur_pos, SEEK_SET);
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}
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int ff_id3v2_write_simple(struct AVFormatContext *s, int id3v2_version,
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const char *magic)
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{
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ID3v2EncContext id3 = { 0 };
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int ret;
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ff_id3v2_start(&id3, s->pb, id3v2_version, magic);
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if ((ret = ff_id3v2_write_metadata(s, &id3)) < 0)
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return ret;
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ff_id3v2_finish(&id3, s->pb, s->metadata_header_padding);
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return 0;
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}
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