/* * 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); 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 void 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; v = get_be32(s->pb); if(ff_mpa_check_header(v) < 0) return; ff_mpegaudio_decode_header(&c, v); if(c.layer != 3) return; /* 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; spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */ st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate}, st->time_base); } 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); 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; } #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