mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-20 22:41:11 +00:00
404 lines
9.4 KiB
C
404 lines
9.4 KiB
C
/*
|
|
* MP3 encoder and decoder
|
|
* Copyright (c) 2003 Fabrice Bellard.
|
|
*
|
|
* This library 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 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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 this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include "avformat.h"
|
|
|
|
#define ID3_HEADER_SIZE 10
|
|
#define ID3_TAG_SIZE 128
|
|
|
|
#define ID3_GENRE_MAX 125
|
|
|
|
static const char *id3_genre_str[ID3_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 ID3_HEADER_SIZE byte long */
|
|
static int id3_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 void id3_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 ID3_TAG_SIZE byte long */
|
|
static int id3_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;
|
|
id3_get_string(s->title, sizeof(s->title), buf + 3, 30);
|
|
id3_get_string(s->author, sizeof(s->author), buf + 33, 30);
|
|
id3_get_string(s->album, sizeof(s->album), buf + 63, 30);
|
|
id3_get_string(str, sizeof(str), buf + 93, 4);
|
|
s->year = atoi(str);
|
|
id3_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 <= ID3_GENRE_MAX)
|
|
pstrcpy(s->genre, sizeof(s->genre), id3_genre_str[genre]);
|
|
return 0;
|
|
}
|
|
|
|
static void id3_create_tag(AVFormatContext *s, uint8_t *buf)
|
|
{
|
|
int v, i;
|
|
|
|
memset(buf, 0, ID3_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 <= ID3_GENRE_MAX; i++) {
|
|
if (!strcasecmp(s->genre, id3_genre_str[i])) {
|
|
buf[127] = i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* mp3 read */
|
|
static int mp3_read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
AVStream *st;
|
|
uint8_t buf[ID3_TAG_SIZE];
|
|
int len, ret, filesize;
|
|
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR_NOMEM;
|
|
|
|
st->codec.codec_type = CODEC_TYPE_AUDIO;
|
|
st->codec.codec_id = CODEC_ID_MP3;
|
|
st->need_parsing = 1;
|
|
|
|
/* try to get the TAG */
|
|
if (!url_is_streamed(&s->pb)) {
|
|
/* XXX: change that */
|
|
filesize = url_filesize(url_fileno(&s->pb));
|
|
if (filesize > 128) {
|
|
url_fseek(&s->pb, filesize - 128, SEEK_SET);
|
|
ret = get_buffer(&s->pb, buf, ID3_TAG_SIZE);
|
|
if (ret == ID3_TAG_SIZE) {
|
|
id3_parse_tag(s, buf);
|
|
}
|
|
url_fseek(&s->pb, 0, SEEK_SET);
|
|
}
|
|
}
|
|
|
|
/* if ID3 header found, skip it */
|
|
ret = get_buffer(&s->pb, buf, ID3_HEADER_SIZE);
|
|
if (ret != ID3_HEADER_SIZE)
|
|
return -1;
|
|
if (id3_match(buf)) {
|
|
/* skip ID3 header */
|
|
len = ((buf[6] & 0x7f) << 21) |
|
|
((buf[7] & 0x7f) << 14) |
|
|
((buf[8] & 0x7f) << 7) |
|
|
(buf[9] & 0x7f);
|
|
url_fskip(&s->pb, len);
|
|
} else {
|
|
url_fseek(&s->pb, 0, 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;
|
|
|
|
if (av_new_packet(pkt, size) < 0)
|
|
return AVERROR_IO;
|
|
|
|
pkt->stream_index = 0;
|
|
ret = get_buffer(&s->pb, pkt->data, size);
|
|
if (ret <= 0) {
|
|
av_free_packet(pkt);
|
|
return AVERROR_IO;
|
|
}
|
|
/* note: we need to modify the packet size here to handle the last
|
|
packet */
|
|
pkt->size = ret;
|
|
return ret;
|
|
}
|
|
|
|
static int mp3_read_close(AVFormatContext *s)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_ENCODERS
|
|
/* simple formats */
|
|
static int mp3_write_header(struct AVFormatContext *s)
|
|
{
|
|
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[ID3_TAG_SIZE];
|
|
|
|
/* write the id3 header */
|
|
if (s->title[0] != '\0') {
|
|
id3_create_tag(s, buf);
|
|
put_buffer(&s->pb, buf, ID3_TAG_SIZE);
|
|
put_flush_packet(&s->pb);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif //CONFIG_ENCODERS
|
|
|
|
AVInputFormat mp3_iformat = {
|
|
"mp3",
|
|
"MPEG audio",
|
|
0,
|
|
NULL,
|
|
mp3_read_header,
|
|
mp3_read_packet,
|
|
mp3_read_close,
|
|
.extensions = "mp2,mp3", /* XXX: use probe */
|
|
};
|
|
|
|
#ifdef CONFIG_ENCODERS
|
|
AVOutputFormat mp2_oformat = {
|
|
"mp2",
|
|
"MPEG audio layer 2",
|
|
"audio/x-mpeg",
|
|
#ifdef CONFIG_MP3LAME
|
|
"mp2",
|
|
#else
|
|
"mp2,mp3",
|
|
#endif
|
|
0,
|
|
CODEC_ID_MP2,
|
|
0,
|
|
mp3_write_header,
|
|
mp3_write_packet,
|
|
mp3_write_trailer,
|
|
};
|
|
|
|
#ifdef CONFIG_MP3LAME
|
|
AVOutputFormat mp3_oformat = {
|
|
"mp3",
|
|
"MPEG audio layer 3",
|
|
"audio/x-mpeg",
|
|
"mp3",
|
|
0,
|
|
CODEC_ID_MP3,
|
|
0,
|
|
mp3_write_header,
|
|
mp3_write_packet,
|
|
mp3_write_trailer,
|
|
};
|
|
#endif
|
|
#endif //CONFIG_ENCODERS
|
|
|
|
int mp3_init(void)
|
|
{
|
|
av_register_input_format(&mp3_iformat);
|
|
#ifdef CONFIG_ENCODERS
|
|
av_register_output_format(&mp2_oformat);
|
|
#ifdef CONFIG_MP3LAME
|
|
av_register_output_format(&mp3_oformat);
|
|
#endif
|
|
#endif //CONFIG_ENCODERS
|
|
return 0;
|
|
}
|