mirror of
https://github.com/FFmpeg/FFmpeg.git
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244 lines
7.0 KiB
C
244 lines
7.0 KiB
C
/*
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* ID3v2 header writer
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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/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 "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;
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uint8_t *pb;
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AVIOContext *dyn_buf;
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if (avio_open_dyn_buf(&dyn_buf) < 0)
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return AVERROR(ENOMEM);
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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_close_dyn_buf(dyn_buf, &pb);
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avio_wb32(avioc, tag);
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/* ID3v2.3 frame size is not synchsafe */
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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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av_freep(&pb);
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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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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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int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3)
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{
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AVDictionaryEntry *t = NULL;
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int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM :
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ID3v2_ENCODING_UTF8;
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ff_metadata_conv(&s->metadata, ff_id3v2_34_metadata_conv, NULL);
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if (id3->version == 4)
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ff_metadata_conv(&s->metadata, ff_id3v2_4_metadata_conv, NULL);
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while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
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int ret;
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if ((ret = id3v2_check_write_tag(id3, s->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, s->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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/* unknown tag, write as TXXX frame */
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if ((ret = id3v2_put_ttag(id3, s->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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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;
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/* get the mimetype*/
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while (mime->id != CODEC_ID_NONE) {
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if (mime->id == st->codec->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 (strstr(ff_id3v2_picture_types[i], 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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/* start writing */
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if (avio_open_dyn_buf(&dyn_buf) < 0)
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return AVERROR(ENOMEM);
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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_close_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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av_freep(&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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{
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int64_t 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);
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return 0;
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}
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