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ffmpeg/libavformat/mp3.c

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/*
* MP3 muxer and demuxer
* 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 "libavutil/avstring.h"
#include "libavcodec/mpegaudio.h"
#include "libavcodec/mpegaudiodecheader.h"
#include "avformat.h"
#define ID3v2_HEADER_SIZE 10
#define ID3v1_TAG_SIZE 128
#define ID3v1_GENRE_MAX 125
static const char * const id3v1_genre_str[ID3v1_GENRE_MAX + 1] = {
[0] = "Blues",
[1] = "Classic Rock",
[2] = "Country",
[3] = "Dance",
[4] = "Disco",
[5] = "Funk",
[6] = "Grunge",
[7] = "Hip-Hop",
[8] = "Jazz",
[9] = "Metal",
[10] = "New Age",
[11] = "Oldies",
[12] = "Other",
[13] = "Pop",
[14] = "R&B",
[15] = "Rap",
[16] = "Reggae",
[17] = "Rock",
[18] = "Techno",
[19] = "Industrial",
[20] = "Alternative",
[21] = "Ska",
[22] = "Death Metal",
[23] = "Pranks",
[24] = "Soundtrack",
[25] = "Euro-Techno",
[26] = "Ambient",
[27] = "Trip-Hop",
[28] = "Vocal",
[29] = "Jazz+Funk",
[30] = "Fusion",
[31] = "Trance",
[32] = "Classical",
[33] = "Instrumental",
[34] = "Acid",
[35] = "House",
[36] = "Game",
[37] = "Sound Clip",
[38] = "Gospel",
[39] = "Noise",
[40] = "AlternRock",
[41] = "Bass",
[42] = "Soul",
[43] = "Punk",
[44] = "Space",
[45] = "Meditative",
[46] = "Instrumental Pop",
[47] = "Instrumental Rock",
[48] = "Ethnic",
[49] = "Gothic",
[50] = "Darkwave",
[51] = "Techno-Industrial",
[52] = "Electronic",
[53] = "Pop-Folk",
[54] = "Eurodance",
[55] = "Dream",
[56] = "Southern Rock",
[57] = "Comedy",
[58] = "Cult",
[59] = "Gangsta",
[60] = "Top 40",
[61] = "Christian Rap",
[62] = "Pop/Funk",
[63] = "Jungle",
[64] = "Native American",
[65] = "Cabaret",
[66] = "New Wave",
[67] = "Psychadelic",
[68] = "Rave",
[69] = "Showtunes",
[70] = "Trailer",
[71] = "Lo-Fi",
[72] = "Tribal",
[73] = "Acid Punk",
[74] = "Acid Jazz",
[75] = "Polka",
[76] = "Retro",
[77] = "Musical",
[78] = "Rock & Roll",
[79] = "Hard Rock",
[80] = "Folk",
[81] = "Folk-Rock",
[82] = "National Folk",
[83] = "Swing",
[84] = "Fast Fusion",
[85] = "Bebob",
[86] = "Latin",
[87] = "Revival",
[88] = "Celtic",
[89] = "Bluegrass",
[90] = "Avantgarde",
[91] = "Gothic Rock",
[92] = "Progressive Rock",
[93] = "Psychedelic Rock",
[94] = "Symphonic Rock",
[95] = "Slow Rock",
[96] = "Big Band",
[97] = "Chorus",
[98] = "Easy Listening",
[99] = "Acoustic",
[100] = "Humour",
[101] = "Speech",
[102] = "Chanson",
[103] = "Opera",
[104] = "Chamber Music",
[105] = "Sonata",
[106] = "Symphony",
[107] = "Booty Bass",
[108] = "Primus",
[109] = "Porn Groove",
[110] = "Satire",
[111] = "Slow Jam",
[112] = "Club",
[113] = "Tango",
[114] = "Samba",
[115] = "Folklore",
[116] = "Ballad",
[117] = "Power Ballad",
[118] = "Rhythmic Soul",
[119] = "Freestyle",
[120] = "Duet",
[121] = "Punk Rock",
[122] = "Drum Solo",
[123] = "A capella",
[124] = "Euro-House",
[125] = "Dance Hall",
};
/* buf must be ID3v2_HEADER_SIZE byte long */
static int id3v2_match(const uint8_t *buf)
{
return buf[0] == 'I' &&
buf[1] == 'D' &&
buf[2] == '3' &&
buf[3] != 0xff &&
buf[4] != 0xff &&
(buf[6] & 0x80) == 0 &&
(buf[7] & 0x80) == 0 &&
(buf[8] & 0x80) == 0 &&
(buf[9] & 0x80) == 0;
}
static unsigned int id3v2_get_size(ByteIOContext *s, int len)
{
int v=0;
while(len--)
v= (v<<7) + (get_byte(s)&0x7F);
return v;
}
static void id3v2_read_ttag(AVFormatContext *s, int taglen, char *dst, int dstlen)
{
char *q;
int len;
if(dstlen > 0)
dst[0]= 0;
if(taglen < 1)
return;
taglen--; /* account for encoding type byte */
dstlen--; /* Leave space for zero terminator */
switch(get_byte(s->pb)) { /* encoding type */
case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */
q = dst;
while(taglen--) {
uint8_t tmp;
PUT_UTF8(get_byte(s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;)
}
*q = '\0';
break;
case 3: /* UTF-8 */
len = FFMIN(taglen, dstlen-1);
get_buffer(s->pb, dst, len);
dst[len] = 0;
break;
}
}
/**
* ID3v2 parser
*
* Handles ID3v2.2, 2.3 and 2.4.
*
*/
static void id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
{
int isv34, tlen;
uint32_t tag;
int64_t next;
char tmp[16];
int taghdrlen;
const char *reason;
switch(version) {
case 2:
if(flags & 0x40) {
reason = "compression";
goto error;
}
isv34 = 0;
taghdrlen = 6;
break;
case 3:
case 4:
isv34 = 1;
taghdrlen = 10;
break;
default:
reason = "version";
goto error;
}
if(flags & 0x80) {
reason = "unsynchronization";
goto error;
}
if(isv34 && flags & 0x40) /* Extended header present, just skip over it */
url_fskip(s->pb, id3v2_get_size(s->pb, 4));
while(len >= taghdrlen) {
if(isv34) {
tag = get_be32(s->pb);
tlen = id3v2_get_size(s->pb, 4);
get_be16(s->pb); /* flags */
} else {
tag = get_be24(s->pb);
tlen = id3v2_get_size(s->pb, 3);
}
len -= taghdrlen + tlen;
if(len < 0)
break;
next = url_ftell(s->pb) + tlen;
switch(tag) {
case MKBETAG('T', 'I', 'T', '2'):
case MKBETAG(0, 'T', 'T', '2'):
id3v2_read_ttag(s, tlen, s->title, sizeof(s->title));
break;
case MKBETAG('T', 'P', 'E', '1'):
case MKBETAG(0, 'T', 'P', '1'):
id3v2_read_ttag(s, tlen, s->author, sizeof(s->author));
break;
case MKBETAG('T', 'A', 'L', 'B'):
case MKBETAG(0, 'T', 'A', 'L'):
id3v2_read_ttag(s, tlen, s->album, sizeof(s->album));
break;
case MKBETAG('T', 'C', 'O', 'N'):
case MKBETAG(0, 'T', 'C', 'O'):
id3v2_read_ttag(s, tlen, s->genre, sizeof(s->genre));
break;
case MKBETAG('T', 'C', 'O', 'P'):
case MKBETAG(0, 'T', 'C', 'R'):
id3v2_read_ttag(s, tlen, s->copyright, sizeof(s->copyright));
break;
case MKBETAG('T', 'R', 'C', 'K'):
case MKBETAG(0, 'T', 'R', 'K'):
id3v2_read_ttag(s, tlen, tmp, sizeof(tmp));
s->track = atoi(tmp);
break;
case 0:
/* padding, skip to end */
url_fskip(s->pb, len);
len = 0;
continue;
}
/* Skip to end of tag */
url_fseek(s->pb, next, SEEK_SET);
}
if(version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
url_fskip(s->pb, 10);
return;
error:
av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
url_fskip(s->pb, len);
}
static void id3v1_get_string(char *str, int str_size,
const uint8_t *buf, int buf_size)
{
int i, c;
char *q;
q = str;
for(i = 0; i < buf_size; i++) {
c = buf[i];
if (c == '\0')
break;
if ((q - str) >= str_size - 1)
break;
*q++ = c;
}
*q = '\0';
}
/* 'buf' must be ID3v1_TAG_SIZE byte long */
static int id3v1_parse_tag(AVFormatContext *s, const uint8_t *buf)
{
char str[5];
int genre;
if (!(buf[0] == 'T' &&
buf[1] == 'A' &&
buf[2] == 'G'))
return -1;
id3v1_get_string(s->title, sizeof(s->title), buf + 3, 30);
id3v1_get_string(s->author, sizeof(s->author), buf + 33, 30);
id3v1_get_string(s->album, sizeof(s->album), buf + 63, 30);
id3v1_get_string(str, sizeof(str), buf + 93, 4);
s->year = atoi(str);
id3v1_get_string(s->comment, sizeof(s->comment), buf + 97, 30);
if (buf[125] == 0 && buf[126] != 0)
s->track = buf[126];
genre = buf[127];
if (genre <= ID3v1_GENRE_MAX)
av_strlcpy(s->genre, id3v1_genre_str[genre], sizeof(s->genre));
return 0;
}
/* mp3 read */
static int mp3_read_probe(AVProbeData *p)
{
int max_frames, first_frames = 0;
int fsize, frames, sample_rate;
uint32_t header;
uint8_t *buf, *buf2, *end;
AVCodecContext avctx;
if(id3v2_match(p->buf))
return AVPROBE_SCORE_MAX/2+1; // this must be less than mpeg-ps because some retards put id3v2 tags before mpeg-ps files
max_frames = 0;
buf = p->buf;
end = buf + p->buf_size - sizeof(uint32_t);
for(; buf < end; buf= buf2+1) {
buf2 = buf;
for(frames = 0; buf2 < end; frames++) {
header = AV_RB32(buf2);
fsize = ff_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
if(fsize < 0)
break;
buf2 += fsize;
}
max_frames = FFMAX(max_frames, frames);
if(buf == p->buf)
first_frames= frames;
}
if (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
else if(max_frames>=1) return 1;
else return 0;
}
/**
* Try to find Xing/Info/VBRI tags and compute duration from info therein
*/
static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base)
{
uint32_t v, spf;
int frames = -1; /* Total number of frames in file */
const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
MPADecodeContext c;
int vbrtag_size = 0;
v = get_be32(s->pb);
if(ff_mpa_check_header(v) < 0)
return -1;
if (ff_mpegaudio_decode_header(&c, v) == 0)
vbrtag_size = c.frame_size;
if(c.layer != 3)
return -1;
/* Check for Xing / Info tag */
url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
v = get_be32(s->pb);
if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
v = get_be32(s->pb);
if(v & 0x1)
frames = get_be32(s->pb);
}
/* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
url_fseek(s->pb, base + 4 + 32, SEEK_SET);
v = get_be32(s->pb);
if(v == MKBETAG('V', 'B', 'R', 'I')) {
/* Check tag version */
if(get_be16(s->pb) == 1) {
/* skip delay, quality and total bytes */
url_fseek(s->pb, 8, SEEK_CUR);
frames = get_be32(s->pb);
}
}
if(frames < 0)
return -1;
/* Skip the vbr tag frame */
url_fseek(s->pb, base + vbrtag_size, SEEK_SET);
spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
st->time_base);
return 0;
}
static int mp3_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *st;
uint8_t buf[ID3v1_TAG_SIZE];
int len, ret, filesize;
int64_t off;
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_MP3;
st->need_parsing = AVSTREAM_PARSE_FULL;
st->start_time = 0;
/* try to get the TAG */
if (!url_is_streamed(s->pb)) {
/* XXX: change that */
filesize = url_fsize(s->pb);
if (filesize > 128) {
url_fseek(s->pb, filesize - 128, SEEK_SET);
ret = get_buffer(s->pb, buf, ID3v1_TAG_SIZE);
if (ret == ID3v1_TAG_SIZE) {
id3v1_parse_tag(s, buf);
}
url_fseek(s->pb, 0, SEEK_SET);
}
}
/* if ID3v2 header found, skip it */
ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
if (ret != ID3v2_HEADER_SIZE)
return -1;
if (id3v2_match(buf)) {
/* parse ID3v2 header */
len = ((buf[6] & 0x7f) << 21) |
((buf[7] & 0x7f) << 14) |
((buf[8] & 0x7f) << 7) |
(buf[9] & 0x7f);
id3v2_parse(s, len, buf[3], buf[5]);
} else {
url_fseek(s->pb, 0, SEEK_SET);
}
off = url_ftell(s->pb);
if (mp3_parse_vbr_tags(s, st, off) < 0)
url_fseek(s->pb, off, SEEK_SET);
/* the parameters will be extracted from the compressed bitstream */
return 0;
}
#define MP3_PACKET_SIZE 1024
static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, size;
// AVStream *st = s->streams[0];
size= MP3_PACKET_SIZE;
ret= av_get_packet(s->pb, pkt, size);
pkt->stream_index = 0;
if (ret <= 0) {
return AVERROR(EIO);
}
/* note: we need to modify the packet size here to handle the last
packet */
pkt->size = ret;
return ret;
}
#if defined(CONFIG_MP2_MUXER) || defined(CONFIG_MP3_MUXER)
static void id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
{
int v, i;
memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
buf[0] = 'T';
buf[1] = 'A';
buf[2] = 'G';
strncpy(buf + 3, s->title, 30);
strncpy(buf + 33, s->author, 30);
strncpy(buf + 63, s->album, 30);
v = s->year;
if (v > 0) {
for(i = 0;i < 4; i++) {
buf[96 - i] = '0' + (v % 10);
v = v / 10;
}
}
strncpy(buf + 97, s->comment, 30);
if (s->track != 0) {
buf[125] = 0;
buf[126] = s->track;
}
for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
if (!strcasecmp(s->genre, id3v1_genre_str[i])) {
buf[127] = i;
break;
}
}
}
/* 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 *string, uint32_t tag)
{
int len = strlen(string);
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, string, len);
}
/**
* Write an ID3v2.4 header at beginning of stream
*/
static int mp3_write_header(struct AVFormatContext *s)
{
int totlen = 0;
char tracktxt[10];
char yeartxt[10];
if(s->track)
snprintf(tracktxt, sizeof(tracktxt), "%d", s->track);
if(s->year)
snprintf( yeartxt, sizeof(yeartxt) , "%d", s->year );
if(s->title[0]) totlen += 11 + strlen(s->title);
if(s->author[0]) totlen += 11 + strlen(s->author);
if(s->album[0]) totlen += 11 + strlen(s->album);
if(s->genre[0]) totlen += 11 + strlen(s->genre);
if(s->copyright[0]) totlen += 11 + strlen(s->copyright);
if(s->track) totlen += 11 + strlen(tracktxt);
if(s->year) totlen += 11 + strlen(yeartxt);
if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
totlen += strlen(LIBAVFORMAT_IDENT) + 11;
if(totlen == 0)
return 0;
put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
put_byte(s->pb, 0);
put_byte(s->pb, 0); /* flags */
id3v2_put_size(s, totlen);
if(s->title[0]) id3v2_put_ttag(s, s->title, MKBETAG('T', 'I', 'T', '2'));
if(s->author[0]) id3v2_put_ttag(s, s->author, MKBETAG('T', 'P', 'E', '1'));
if(s->album[0]) id3v2_put_ttag(s, s->album, MKBETAG('T', 'A', 'L', 'B'));
if(s->genre[0]) id3v2_put_ttag(s, s->genre, MKBETAG('T', 'C', 'O', 'N'));
if(s->copyright[0]) id3v2_put_ttag(s, s->copyright, MKBETAG('T', 'C', 'O', 'P'));
if(s->track) id3v2_put_ttag(s, tracktxt, MKBETAG('T', 'R', 'C', 'K'));
if(s->year) id3v2_put_ttag(s, yeartxt, MKBETAG('T', 'Y', 'E', 'R'));
if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
id3v2_put_ttag(s, LIBAVFORMAT_IDENT, MKBETAG('T', 'E', 'N', 'C'));
return 0;
}
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 (s->title[0] != '\0') {
id3v1_create_tag(s, buf);
put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
put_flush_packet(s->pb);
}
return 0;
}
#endif /* defined(CONFIG_MP2_MUXER) || defined(CONFIG_MP3_MUXER) */
#ifdef CONFIG_MP3_DEMUXER
AVInputFormat mp3_demuxer = {
"mp3",
NULL_IF_CONFIG_SMALL("MPEG audio"),
0,
mp3_read_probe,
mp3_read_header,
mp3_read_packet,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "mp2,mp3,m2a", /* XXX: use probe */
};
#endif
#ifdef CONFIG_MP2_MUXER
AVOutputFormat mp2_muxer = {
"mp2",
NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
"audio/x-mpeg",
#ifdef CONFIG_LIBMP3LAME
"mp2,m2a",
#else
"mp2,mp3,m2a",
#endif
0,
CODEC_ID_MP2,
CODEC_ID_NONE,
NULL,
mp3_write_packet,
mp3_write_trailer,
};
#endif
#ifdef CONFIG_MP3_MUXER
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,
};
#endif
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