mirror of
https://github.com/librempeg/librempeg
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404 lines
9.4 KiB
C
404 lines
9.4 KiB
C
/*
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* MP3 encoder and decoder
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* Copyright (c) 2003 Fabrice Bellard.
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.h"
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#define ID3_HEADER_SIZE 10
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#define ID3_TAG_SIZE 128
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#define ID3_GENRE_MAX 125
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static const char *id3_genre_str[ID3_GENRE_MAX + 1] = {
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[0] = "Blues",
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[1] = "Classic Rock",
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[2] = "Country",
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[3] = "Dance",
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[4] = "Disco",
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[5] = "Funk",
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[6] = "Grunge",
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[7] = "Hip-Hop",
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[8] = "Jazz",
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[9] = "Metal",
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[10] = "New Age",
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[11] = "Oldies",
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[12] = "Other",
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[13] = "Pop",
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[14] = "R&B",
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[15] = "Rap",
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[16] = "Reggae",
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[17] = "Rock",
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[18] = "Techno",
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[19] = "Industrial",
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[20] = "Alternative",
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[21] = "Ska",
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[22] = "Death Metal",
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[23] = "Pranks",
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[24] = "Soundtrack",
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[25] = "Euro-Techno",
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[26] = "Ambient",
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[27] = "Trip-Hop",
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[28] = "Vocal",
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[29] = "Jazz+Funk",
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[30] = "Fusion",
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[31] = "Trance",
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[32] = "Classical",
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[33] = "Instrumental",
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[34] = "Acid",
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[35] = "House",
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[36] = "Game",
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[37] = "Sound Clip",
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[38] = "Gospel",
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[39] = "Noise",
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[40] = "AlternRock",
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[41] = "Bass",
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[42] = "Soul",
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[43] = "Punk",
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[44] = "Space",
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[45] = "Meditative",
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[46] = "Instrumental Pop",
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[47] = "Instrumental Rock",
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[48] = "Ethnic",
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[49] = "Gothic",
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[50] = "Darkwave",
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[51] = "Techno-Industrial",
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[52] = "Electronic",
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[53] = "Pop-Folk",
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[54] = "Eurodance",
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[55] = "Dream",
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[56] = "Southern Rock",
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[57] = "Comedy",
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[58] = "Cult",
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[59] = "Gangsta",
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[60] = "Top 40",
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[61] = "Christian Rap",
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[62] = "Pop/Funk",
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[63] = "Jungle",
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[64] = "Native American",
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[65] = "Cabaret",
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[66] = "New Wave",
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[67] = "Psychadelic",
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[68] = "Rave",
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[69] = "Showtunes",
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[70] = "Trailer",
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[71] = "Lo-Fi",
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[72] = "Tribal",
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[73] = "Acid Punk",
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[74] = "Acid Jazz",
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[75] = "Polka",
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[76] = "Retro",
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[77] = "Musical",
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[78] = "Rock & Roll",
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[79] = "Hard Rock",
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[80] = "Folk",
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[81] = "Folk-Rock",
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[82] = "National Folk",
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[83] = "Swing",
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[84] = "Fast Fusion",
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[85] = "Bebob",
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[86] = "Latin",
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[87] = "Revival",
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[88] = "Celtic",
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[89] = "Bluegrass",
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[90] = "Avantgarde",
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[91] = "Gothic Rock",
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[92] = "Progressive Rock",
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[93] = "Psychedelic Rock",
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[94] = "Symphonic Rock",
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[95] = "Slow Rock",
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[96] = "Big Band",
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[97] = "Chorus",
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[98] = "Easy Listening",
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[99] = "Acoustic",
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[100] = "Humour",
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[101] = "Speech",
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[102] = "Chanson",
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[103] = "Opera",
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[104] = "Chamber Music",
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[105] = "Sonata",
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[106] = "Symphony",
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[107] = "Booty Bass",
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[108] = "Primus",
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[109] = "Porn Groove",
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[110] = "Satire",
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[111] = "Slow Jam",
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[112] = "Club",
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[113] = "Tango",
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[114] = "Samba",
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[115] = "Folklore",
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[116] = "Ballad",
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[117] = "Power Ballad",
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[118] = "Rhythmic Soul",
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[119] = "Freestyle",
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[120] = "Duet",
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[121] = "Punk Rock",
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[122] = "Drum Solo",
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[123] = "A capella",
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[124] = "Euro-House",
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[125] = "Dance Hall",
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};
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/* buf must be ID3_HEADER_SIZE byte long */
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static int id3_match(const uint8_t *buf)
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{
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return (buf[0] == 'I' &&
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buf[1] == 'D' &&
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buf[2] == '3' &&
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buf[3] != 0xff &&
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buf[4] != 0xff &&
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(buf[6] & 0x80) == 0 &&
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(buf[7] & 0x80) == 0 &&
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(buf[8] & 0x80) == 0 &&
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(buf[9] & 0x80) == 0);
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}
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static void id3_get_string(char *str, int str_size,
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const uint8_t *buf, int buf_size)
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{
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int i, c;
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char *q;
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q = str;
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for(i = 0; i < buf_size; i++) {
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c = buf[i];
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if (c == '\0')
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break;
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if ((q - str) >= str_size - 1)
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break;
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*q++ = c;
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}
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*q = '\0';
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}
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/* 'buf' must be ID3_TAG_SIZE byte long */
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static int id3_parse_tag(AVFormatContext *s, const uint8_t *buf)
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{
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char str[5];
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int genre;
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if (!(buf[0] == 'T' &&
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buf[1] == 'A' &&
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buf[2] == 'G'))
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return -1;
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id3_get_string(s->title, sizeof(s->title), buf + 3, 30);
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id3_get_string(s->author, sizeof(s->author), buf + 33, 30);
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id3_get_string(s->album, sizeof(s->album), buf + 63, 30);
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id3_get_string(str, sizeof(str), buf + 93, 4);
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s->year = atoi(str);
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id3_get_string(s->comment, sizeof(s->comment), buf + 97, 30);
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if (buf[125] == 0 && buf[126] != 0)
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s->track = buf[126];
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genre = buf[127];
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if (genre <= ID3_GENRE_MAX)
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pstrcpy(s->genre, sizeof(s->genre), id3_genre_str[genre]);
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return 0;
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}
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static void id3_create_tag(AVFormatContext *s, uint8_t *buf)
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{
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int v, i;
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memset(buf, 0, ID3_TAG_SIZE); /* fail safe */
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buf[0] = 'T';
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buf[1] = 'A';
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buf[2] = 'G';
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strncpy(buf + 3, s->title, 30);
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strncpy(buf + 33, s->author, 30);
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strncpy(buf + 63, s->album, 30);
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v = s->year;
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if (v > 0) {
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for(i = 0;i < 4; i++) {
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buf[96 - i] = '0' + (v % 10);
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v = v / 10;
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}
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}
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strncpy(buf + 97, s->comment, 30);
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if (s->track != 0) {
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buf[125] = 0;
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buf[126] = s->track;
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}
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for(i = 0; i <= ID3_GENRE_MAX; i++) {
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if (!strcasecmp(s->genre, id3_genre_str[i])) {
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buf[127] = i;
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break;
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}
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}
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}
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/* mp3 read */
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static int mp3_read_header(AVFormatContext *s,
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AVFormatParameters *ap)
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{
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AVStream *st;
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uint8_t buf[ID3_TAG_SIZE];
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int len, ret, filesize;
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR_NOMEM;
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st->codec.codec_type = CODEC_TYPE_AUDIO;
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st->codec.codec_id = CODEC_ID_MP3;
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st->need_parsing = 1;
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/* try to get the TAG */
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if (!url_is_streamed(&s->pb)) {
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/* XXX: change that */
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filesize = url_filesize(url_fileno(&s->pb));
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if (filesize > 128) {
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url_fseek(&s->pb, filesize - 128, SEEK_SET);
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ret = get_buffer(&s->pb, buf, ID3_TAG_SIZE);
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if (ret == ID3_TAG_SIZE) {
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id3_parse_tag(s, buf);
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}
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url_fseek(&s->pb, 0, SEEK_SET);
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}
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}
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/* if ID3 header found, skip it */
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ret = get_buffer(&s->pb, buf, ID3_HEADER_SIZE);
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if (ret != ID3_HEADER_SIZE)
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return -1;
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if (id3_match(buf)) {
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/* skip ID3 header */
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len = ((buf[6] & 0x7f) << 21) |
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((buf[7] & 0x7f) << 14) |
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((buf[8] & 0x7f) << 7) |
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(buf[9] & 0x7f);
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url_fskip(&s->pb, len);
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} else {
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url_fseek(&s->pb, 0, SEEK_SET);
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}
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/* the parameters will be extracted from the compressed bitstream */
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return 0;
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}
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#define MP3_PACKET_SIZE 1024
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static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret, size;
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// AVStream *st = s->streams[0];
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size= MP3_PACKET_SIZE;
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if (av_new_packet(pkt, size) < 0)
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return AVERROR_IO;
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pkt->stream_index = 0;
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ret = get_buffer(&s->pb, pkt->data, size);
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if (ret <= 0) {
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av_free_packet(pkt);
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return AVERROR_IO;
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}
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/* note: we need to modify the packet size here to handle the last
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packet */
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pkt->size = ret;
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return ret;
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}
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static int mp3_read_close(AVFormatContext *s)
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{
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return 0;
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}
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#ifdef CONFIG_ENCODERS
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/* simple formats */
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static int mp3_write_header(struct AVFormatContext *s)
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{
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return 0;
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}
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static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
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{
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put_buffer(&s->pb, pkt->data, pkt->size);
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put_flush_packet(&s->pb);
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return 0;
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}
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static int mp3_write_trailer(struct AVFormatContext *s)
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{
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uint8_t buf[ID3_TAG_SIZE];
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/* write the id3 header */
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if (s->title[0] != '\0') {
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id3_create_tag(s, buf);
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put_buffer(&s->pb, buf, ID3_TAG_SIZE);
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put_flush_packet(&s->pb);
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}
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return 0;
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}
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#endif //CONFIG_ENCODERS
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AVInputFormat mp3_iformat = {
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"mp3",
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"MPEG audio",
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0,
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NULL,
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mp3_read_header,
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mp3_read_packet,
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mp3_read_close,
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.extensions = "mp2,mp3", /* XXX: use probe */
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};
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#ifdef CONFIG_ENCODERS
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AVOutputFormat mp2_oformat = {
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"mp2",
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"MPEG audio layer 2",
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"audio/x-mpeg",
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#ifdef CONFIG_MP3LAME
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"mp2",
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#else
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"mp2,mp3",
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#endif
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0,
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CODEC_ID_MP2,
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0,
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mp3_write_header,
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mp3_write_packet,
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mp3_write_trailer,
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};
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#ifdef CONFIG_MP3LAME
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AVOutputFormat mp3_oformat = {
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"mp3",
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"MPEG audio layer 3",
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"audio/x-mpeg",
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"mp3",
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0,
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CODEC_ID_MP3,
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0,
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mp3_write_header,
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mp3_write_packet,
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mp3_write_trailer,
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};
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#endif
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#endif //CONFIG_ENCODERS
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int mp3_init(void)
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{
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av_register_input_format(&mp3_iformat);
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#ifdef CONFIG_ENCODERS
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av_register_output_format(&mp2_oformat);
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#ifdef CONFIG_MP3LAME
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av_register_output_format(&mp3_oformat);
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#endif
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#endif //CONFIG_ENCODERS
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return 0;
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}
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