mirror of
https://git.ffmpeg.org/ffmpeg.git
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687 lines
18 KiB
C
687 lines
18 KiB
C
/*
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* MP3 muxer and demuxer
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* Copyright (c) 2003 Fabrice Bellard.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "libavutil/avstring.h"
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#include "libavcodec/mpegaudio.h"
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#include "libavcodec/mpegaudiodecheader.h"
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#include "avformat.h"
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#define ID3v2_HEADER_SIZE 10
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#define ID3v1_TAG_SIZE 128
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#define ID3v1_GENRE_MAX 125
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static const char *id3v1_genre_str[ID3v1_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 ID3v2_HEADER_SIZE byte long */
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static int id3v2_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 unsigned int id3v2_get_size(ByteIOContext *s, int len)
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{
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int v=0;
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while(len--)
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v= (v<<7) + (get_byte(s)&0x7F);
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return v;
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}
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static void id3v2_read_ttag(AVFormatContext *s, int taglen, char *dst, int dstlen)
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{
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char *q;
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int len;
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if(dstlen > 0)
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dst[0]= 0;
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if(taglen < 1)
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return;
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taglen--; /* account for encoding type byte */
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dstlen--; /* Leave space for zero terminator */
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switch(get_byte(s->pb)) { /* encoding type */
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case 0: /* ISO-8859-1 (0 - 255 maps directly into unicode) */
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q = dst;
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while(taglen--) {
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uint8_t tmp;
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PUT_UTF8(get_byte(s->pb), tmp, if (q - dst < dstlen - 1) *q++ = tmp;)
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}
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*q = '\0';
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break;
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case 3: /* UTF-8 */
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len = FFMIN(taglen, dstlen-1);
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get_buffer(s->pb, dst, len);
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dst[len] = 0;
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break;
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}
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}
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/**
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* ID3v2 parser
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*
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* Handles ID3v2.2, 2.3 and 2.4.
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*
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*/
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static void id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
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{
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int isv34, tlen;
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uint32_t tag;
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offset_t next;
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char tmp[16];
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int taghdrlen;
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const char *reason;
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switch(version) {
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case 2:
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if(flags & 0x40) {
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reason = "compression";
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goto error;
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}
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isv34 = 0;
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taghdrlen = 6;
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break;
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case 3:
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case 4:
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isv34 = 1;
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taghdrlen = 10;
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break;
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default:
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reason = "version";
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goto error;
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}
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if(flags & 0x80) {
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reason = "unsynchronization";
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goto error;
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}
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if(isv34 && flags & 0x40) /* Extended header present, just skip over it */
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url_fskip(s->pb, id3v2_get_size(s->pb, 4));
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while(len >= taghdrlen) {
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if(isv34) {
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tag = get_be32(s->pb);
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tlen = id3v2_get_size(s->pb, 4);
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get_be16(s->pb); /* flags */
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} else {
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tag = get_be24(s->pb);
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tlen = id3v2_get_size(s->pb, 3);
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}
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len -= taghdrlen + tlen;
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if(len < 0)
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break;
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next = url_ftell(s->pb) + tlen;
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switch(tag) {
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case MKBETAG('T', 'I', 'T', '2'):
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case MKBETAG(0, 'T', 'T', '2'):
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id3v2_read_ttag(s, tlen, s->title, sizeof(s->title));
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break;
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case MKBETAG('T', 'P', 'E', '1'):
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case MKBETAG(0, 'T', 'P', '1'):
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id3v2_read_ttag(s, tlen, s->author, sizeof(s->author));
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break;
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case MKBETAG('T', 'A', 'L', 'B'):
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case MKBETAG(0, 'T', 'A', 'L'):
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id3v2_read_ttag(s, tlen, s->album, sizeof(s->album));
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break;
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case MKBETAG('T', 'C', 'O', 'N'):
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case MKBETAG(0, 'T', 'C', 'O'):
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id3v2_read_ttag(s, tlen, s->genre, sizeof(s->genre));
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break;
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case MKBETAG('T', 'C', 'O', 'P'):
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case MKBETAG(0, 'T', 'C', 'R'):
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id3v2_read_ttag(s, tlen, s->copyright, sizeof(s->copyright));
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break;
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case MKBETAG('T', 'R', 'C', 'K'):
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case MKBETAG(0, 'T', 'R', 'K'):
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id3v2_read_ttag(s, tlen, tmp, sizeof(tmp));
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s->track = atoi(tmp);
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break;
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case 0:
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/* padding, skip to end */
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url_fskip(s->pb, len);
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len = 0;
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continue;
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}
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/* Skip to end of tag */
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url_fseek(s->pb, next, SEEK_SET);
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}
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if(version == 4 && flags & 0x10) /* Footer preset, always 10 bytes, skip over it */
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url_fskip(s->pb, 10);
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return;
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error:
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av_log(s, AV_LOG_INFO, "ID3v2.%d tag skipped, cannot handle %s\n", version, reason);
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url_fskip(s->pb, len);
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}
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static void id3v1_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 ID3v1_TAG_SIZE byte long */
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static int id3v1_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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id3v1_get_string(s->title, sizeof(s->title), buf + 3, 30);
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id3v1_get_string(s->author, sizeof(s->author), buf + 33, 30);
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id3v1_get_string(s->album, sizeof(s->album), buf + 63, 30);
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id3v1_get_string(str, sizeof(str), buf + 93, 4);
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s->year = atoi(str);
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id3v1_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 <= ID3v1_GENRE_MAX)
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av_strlcpy(s->genre, id3v1_genre_str[genre], sizeof(s->genre));
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return 0;
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}
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static void id3v1_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, ID3v1_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 <= ID3v1_GENRE_MAX; i++) {
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if (!strcasecmp(s->genre, id3v1_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_probe(AVProbeData *p)
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{
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int max_frames, first_frames = 0;
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int fsize, frames, sample_rate;
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uint32_t header;
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uint8_t *buf, *buf2, *end;
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AVCodecContext avctx;
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if(id3v2_match(p->buf))
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return AVPROBE_SCORE_MAX/2+1; // this must be less than mpeg-ps because some retards put id3v2 tags before mpeg-ps files
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max_frames = 0;
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buf = p->buf;
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end = buf + p->buf_size - sizeof(uint32_t);
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for(; buf < end; buf= buf2+1) {
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buf2 = buf;
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for(frames = 0; buf2 < end; frames++) {
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header = AV_RB32(buf2);
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fsize = ff_mpa_decode_header(&avctx, header, &sample_rate);
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if(fsize < 0)
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break;
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buf2 += fsize;
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}
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max_frames = FFMAX(max_frames, frames);
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if(buf == p->buf)
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first_frames= frames;
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}
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if (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
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else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
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else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
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else if(max_frames>=1) return 1;
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else return 0;
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}
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/**
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* Try to find Xing/Info/VBRI tags and compute duration from info therein
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*/
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static void mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, offset_t base)
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{
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uint32_t v, spf;
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int frames = -1; /* Total number of frames in file */
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const offset_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
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MPADecodeContext c;
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v = get_be32(s->pb);
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if(ff_mpa_check_header(v) < 0)
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return;
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ff_mpegaudio_decode_header(&c, v);
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if(c.layer != 3)
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return;
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/* Check for Xing / Info tag */
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url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
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v = get_be32(s->pb);
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if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
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v = get_be32(s->pb);
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if(v & 0x1)
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frames = get_be32(s->pb);
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}
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/* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
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url_fseek(s->pb, base + 4 + 32, SEEK_SET);
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v = get_be32(s->pb);
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if(v == MKBETAG('V', 'B', 'R', 'I')) {
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/* Check tag version */
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if(get_be16(s->pb) == 1) {
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/* skip delay, quality and total bytes */
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url_fseek(s->pb, 8, SEEK_CUR);
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frames = get_be32(s->pb);
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}
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}
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if(frames < 0)
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return;
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spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
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st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
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st->time_base);
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}
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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[ID3v1_TAG_SIZE];
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int len, ret, filesize;
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offset_t off;
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st = av_new_stream(s, 0);
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if (!st)
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return AVERROR(ENOMEM);
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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 = AVSTREAM_PARSE_FULL;
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st->start_time = 0;
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|
|
/* 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);
|
|
mp3_parse_vbr_tags(s, st, off);
|
|
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;
|
|
}
|
|
|
|
#ifdef CONFIG_MUXERS
|
|
/* 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 //CONFIG_MUXERS
|
|
|
|
#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
|