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/*
* MP3 muxer
* Copyright (c) 2003 Fabrice Bellard
*
* 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 <strings.h>
#include "avformat.h"
#include "id3v1.h"
#include "id3v2.h"
#include "libavutil/intreadwrite.h"
static int id3v1_set_string(AVFormatContext *s, const char *key,
uint8_t *buf, int buf_size)
{
AVMetadataTag *tag;
if ((tag = av_metadata_get(s->metadata, key, NULL, 0)))
strncpy(buf, tag->value, buf_size);
return !!tag;
}
static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
{
AVMetadataTag *tag;
int i, count = 0;
memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
buf[0] = 'T';
buf[1] = 'A';
buf[2] = 'G';
count += id3v1_set_string(s, "TIT2", buf + 3, 30); //title
count += id3v1_set_string(s, "TPE1", buf + 33, 30); //author|artist
count += id3v1_set_string(s, "TALB", buf + 63, 30); //album
count += id3v1_set_string(s, "TDRL", buf + 93, 4); //date
count += id3v1_set_string(s, "comment", buf + 97, 30);
if ((tag = av_metadata_get(s->metadata, "TRCK", NULL, 0))) { //track
buf[125] = 0;
buf[126] = atoi(tag->value);
count++;
}
buf[127] = 0xFF; /* default to unknown genre */
if ((tag = av_metadata_get(s->metadata, "TCON", NULL, 0))) { //genre
for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
buf[127] = i;
count++;
break;
}
}
}
return count;
}
/* simple formats */
static void id3v2_put_size(AVFormatContext *s, int size)
{
put_byte(s->pb, size >> 21 & 0x7f);
put_byte(s->pb, size >> 14 & 0x7f);
put_byte(s->pb, size >> 7 & 0x7f);
put_byte(s->pb, size & 0x7f);
}
static void id3v2_put_ttag(AVFormatContext *s, const char *buf, int len,
uint32_t tag)
{
put_be32(s->pb, tag);
id3v2_put_size(s, len + 1);
put_be16(s->pb, 0);
put_byte(s->pb, 3); /* UTF-8 */
put_buffer(s->pb, buf, len);
}
static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
{
put_buffer(s->pb, pkt->data, pkt->size);
put_flush_packet(s->pb);
return 0;
}
static int mp3_write_trailer(struct AVFormatContext *s)
{
uint8_t buf[ID3v1_TAG_SIZE];
/* write the id3v1 tag */
if (id3v1_create_tag(s, buf) > 0) {
put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
put_flush_packet(s->pb);
}
return 0;
}
#if CONFIG_MP2_MUXER
AVOutputFormat mp2_muxer = {
"mp2",
NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
"audio/x-mpeg",
"mp2,m2a",
0,
CODEC_ID_MP2,
CODEC_ID_NONE,
NULL,
mp3_write_packet,
mp3_write_trailer,
};
#endif
#if CONFIG_MP3_MUXER
/**
* Write an ID3v2.4 header at beginning of stream
*/
static int mp3_write_header(struct AVFormatContext *s)
{
AVMetadataTag *t = NULL;
int totlen = 0;
int64_t size_pos, cur_pos;
put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
put_byte(s->pb, 0);
put_byte(s->pb, 0); /* flags */
/* reserve space for size */
size_pos = url_ftell(s->pb);
put_be32(s->pb, 0);
ff_metadata_conv(&s->metadata, ff_id3v2_metadata_conv, NULL);
while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) {
uint32_t tag = 0;
if (t->key[0] == 'T' && strlen(t->key) == 4) {
int i;
for (i = 0; *ff_id3v2_tags[i]; i++)
if (AV_RB32(t->key) == AV_RB32(ff_id3v2_tags[i])) {
int len = strlen(t->value);
tag = AV_RB32(t->key);
totlen += len + ID3v2_HEADER_SIZE + 2;
id3v2_put_ttag(s, t->value, len + 1, tag);
break;
}
}
if (!tag) { /* unknown tag, write as TXXX frame */
int len = strlen(t->key), len1 = strlen(t->value);
char *buf = av_malloc(len + len1 + 2);
if (!buf)
return AVERROR(ENOMEM);
tag = MKBETAG('T', 'X', 'X', 'X');
strcpy(buf, t->key);
strcpy(buf + len + 1, t->value);
id3v2_put_ttag(s, buf, len + len1 + 2, tag);
totlen += len + len1 + ID3v2_HEADER_SIZE + 3;
av_free(buf);
}
}
cur_pos = url_ftell(s->pb);
url_fseek(s->pb, size_pos, SEEK_SET);
id3v2_put_size(s, totlen);
url_fseek(s->pb, cur_pos, SEEK_SET);
return 0;
}
AVOutputFormat mp3_muxer = {
"mp3",
NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
"audio/x-mpeg",
"mp3",
0,
CODEC_ID_MP3,
CODEC_ID_NONE,
mp3_write_header,
mp3_write_packet,
mp3_write_trailer,
AVFMT_NOTIMESTAMPS,
};
#endif
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