Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 285 lines (244 sloc) 8.785 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284
/*
* 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 "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);
}

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 == 3)
        id3v2_3_metadata_split_date(&s->metadata);
    else 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->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 (strstr(ff_id3v2_picture_types[i], 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;
}
Something went wrong with that request. Please try again.