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FFmpeg/libavformat/mp3.c

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  1. /*

  2.  * MP3 encoder and decoder

  3.  * Copyright (c) 2003 Fabrice Bellard.

  4.  *

  5.  * This library is free software; you can redistribute it and/or

  6.  * modify it under the terms of the GNU Lesser General Public

  7.  * License as published by the Free Software Foundation; either

  8.  * version 2 of the License, or (at your option) any later version.

  9.  *

  10.  * This library is distributed in the hope that it will be useful,

  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  13.  * Lesser General Public License for more details.

  14.  *

  15.  * You should have received a copy of the GNU Lesser General Public

  16.  * License along with this library; if not, write to the Free Software

  17.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  18.  */

  19. #include "avformat.h"

  20. #include "mpegaudio.h"

  21. 

  22. #define ID3_HEADER_SIZE 10

  23. #define ID3_TAG_SIZE 128

  24. 

  25. #define ID3_GENRE_MAX 125

  26. 

  27. static const char *id3_genre_str[ID3_GENRE_MAX + 1] = {

  28.     [0] = "Blues",

  29.     [1] = "Classic Rock",

  30.     [2] = "Country",

  31.     [3] = "Dance",

  32.     [4] = "Disco",

  33.     [5] = "Funk",

  34.     [6] = "Grunge",

  35.     [7] = "Hip-Hop",

  36.     [8] = "Jazz",

  37.     [9] = "Metal",

  38.     [10] = "New Age",

  39.     [11] = "Oldies",

  40.     [12] = "Other",

  41.     [13] = "Pop",

  42.     [14] = "R&B",

  43.     [15] = "Rap",

  44.     [16] = "Reggae",

  45.     [17] = "Rock",

  46.     [18] = "Techno",

  47.     [19] = "Industrial",

  48.     [20] = "Alternative",

  49.     [21] = "Ska",

  50.     [22] = "Death Metal",

  51.     [23] = "Pranks",

  52.     [24] = "Soundtrack",

  53.     [25] = "Euro-Techno",

  54.     [26] = "Ambient",

  55.     [27] = "Trip-Hop",

  56.     [28] = "Vocal",

  57.     [29] = "Jazz+Funk",

  58.     [30] = "Fusion",

  59.     [31] = "Trance",

  60.     [32] = "Classical",

  61.     [33] = "Instrumental",

  62.     [34] = "Acid",

  63.     [35] = "House",

  64.     [36] = "Game",

  65.     [37] = "Sound Clip",

  66.     [38] = "Gospel",

  67.     [39] = "Noise",

  68.     [40] = "AlternRock",

  69.     [41] = "Bass",

  70.     [42] = "Soul",

  71.     [43] = "Punk",

  72.     [44] = "Space",

  73.     [45] = "Meditative",

  74.     [46] = "Instrumental Pop",

  75.     [47] = "Instrumental Rock",

  76.     [48] = "Ethnic",

  77.     [49] = "Gothic",

  78.     [50] = "Darkwave",

  79.     [51] = "Techno-Industrial",

  80.     [52] = "Electronic",

  81.     [53] = "Pop-Folk",

  82.     [54] = "Eurodance",

  83.     [55] = "Dream",

  84.     [56] = "Southern Rock",

  85.     [57] = "Comedy",

  86.     [58] = "Cult",

  87.     [59] = "Gangsta",

  88.     [60] = "Top 40",

  89.     [61] = "Christian Rap",

  90.     [62] = "Pop/Funk",

  91.     [63] = "Jungle",

  92.     [64] = "Native American",

  93.     [65] = "Cabaret",

  94.     [66] = "New Wave",

  95.     [67] = "Psychadelic",

  96.     [68] = "Rave",

  97.     [69] = "Showtunes",

  98.     [70] = "Trailer",

  99.     [71] = "Lo-Fi",

  100.     [72] = "Tribal",

  101.     [73] = "Acid Punk",

  102.     [74] = "Acid Jazz",

  103.     [75] = "Polka",

  104.     [76] = "Retro",

  105.     [77] = "Musical",

  106.     [78] = "Rock & Roll",

  107.     [79] = "Hard Rock",

  108.     [80] = "Folk",

  109.     [81] = "Folk-Rock",

  110.     [82] = "National Folk",

  111.     [83] = "Swing",

  112.     [84] = "Fast Fusion",

  113.     [85] = "Bebob",

  114.     [86] = "Latin",

  115.     [87] = "Revival",

  116.     [88] = "Celtic",

  117.     [89] = "Bluegrass",

  118.     [90] = "Avantgarde",

  119.     [91] = "Gothic Rock",

  120.     [92] = "Progressive Rock",

  121.     [93] = "Psychedelic Rock",

  122.     [94] = "Symphonic Rock",

  123.     [95] = "Slow Rock",

  124.     [96] = "Big Band",

  125.     [97] = "Chorus",

  126.     [98] = "Easy Listening",

  127.     [99] = "Acoustic",

  128.     [100] = "Humour",

  129.     [101] = "Speech",

  130.     [102] = "Chanson",

  131.     [103] = "Opera",

  132.     [104] = "Chamber Music",

  133.     [105] = "Sonata",

  134.     [106] = "Symphony",

  135.     [107] = "Booty Bass",

  136.     [108] = "Primus",

  137.     [109] = "Porn Groove",

  138.     [110] = "Satire",

  139.     [111] = "Slow Jam",

  140.     [112] = "Club",

  141.     [113] = "Tango",

  142.     [114] = "Samba",

  143.     [115] = "Folklore",

  144.     [116] = "Ballad",

  145.     [117] = "Power Ballad",

  146.     [118] = "Rhythmic Soul",

  147.     [119] = "Freestyle",

  148.     [120] = "Duet",

  149.     [121] = "Punk Rock",

  150.     [122] = "Drum Solo",

  151.     [123] = "A capella",

  152.     [124] = "Euro-House",

  153.     [125] = "Dance Hall",

  154. };

  155. 

  156. /* buf must be ID3_HEADER_SIZE byte long */

  157. static int id3_match(const uint8_t *buf)

  158. {

  159.     return (buf[0] == 'I' &&

  160.             buf[1] == 'D' &&

  161.             buf[2] == '3' &&

  162.             buf[3] != 0xff &&

  163.             buf[4] != 0xff &&

  164.             (buf[6] & 0x80) == 0 &&

  165.             (buf[7] & 0x80) == 0 &&

  166.             (buf[8] & 0x80) == 0 &&

  167.             (buf[9] & 0x80) == 0);

  168. }

  169. 

  170. static void id3_get_string(char *str, int str_size,

  171.                            const uint8_t *buf, int buf_size)

  172. {

  173.     int i, c;

  174.     char *q;

  175. 

  176.     q = str;

  177.     for(i = 0; i < buf_size; i++) {

  178.         c = buf[i];

  179.         if (c == '\0')

  180.             break;

  181.         if ((q - str) >= str_size - 1)

  182.             break;

  183.         *q++ = c;

  184.     }

  185.     *q = '\0';

  186. }

  187. 

  188. /* 'buf' must be ID3_TAG_SIZE byte long */

  189. static int id3_parse_tag(AVFormatContext *s, const uint8_t *buf)

  190. {

  191.     char str[5];

  192.     int genre;

  193. 

  194.     if (!(buf[0] == 'T' &&

  195.           buf[1] == 'A' &&

  196.           buf[2] == 'G'))

  197.         return -1;

  198.     id3_get_string(s->title, sizeof(s->title), buf + 3, 30);

  199.     id3_get_string(s->author, sizeof(s->author), buf + 33, 30);

  200.     id3_get_string(s->album, sizeof(s->album), buf + 63, 30);

  201.     id3_get_string(str, sizeof(str), buf + 93, 4);

  202.     s->year = atoi(str);

  203.     id3_get_string(s->comment, sizeof(s->comment), buf + 97, 30);

  204.     if (buf[125] == 0 && buf[126] != 0)

  205.         s->track = buf[126];

  206.     genre = buf[127];

  207.     if (genre <= ID3_GENRE_MAX)

  208.         pstrcpy(s->genre, sizeof(s->genre), id3_genre_str[genre]);

  209.     return 0;

  210. }

  211. 

  212. static void id3_create_tag(AVFormatContext *s, uint8_t *buf)

  213. {

  214.     int v, i;

  215. 

  216.     memset(buf, 0, ID3_TAG_SIZE); /* fail safe */

  217.     buf[0] = 'T';

  218.     buf[1] = 'A';

  219.     buf[2] = 'G';

  220.     strncpy(buf + 3, s->title, 30);

  221.     strncpy(buf + 33, s->author, 30);

  222.     strncpy(buf + 63, s->album, 30);

  223.     v = s->year;

  224.     if (v > 0) {

  225.         for(i = 0;i < 4; i++) {

  226.             buf[96 - i] = '0' + (v % 10);

  227.             v = v / 10;

  228.         }

  229.     }

  230.     strncpy(buf + 97, s->comment, 30);

  231.     if (s->track != 0) {

  232.         buf[125] = 0;

  233.         buf[126] = s->track;

  234.     }

  235.     for(i = 0; i <= ID3_GENRE_MAX; i++) {

  236.         if (!strcasecmp(s->genre, id3_genre_str[i])) {

  237.             buf[127] = i;

  238.             break;

  239.         }

  240.     }

  241. }

  242. 

  243. /* mp3 read */

  244. 

  245. static int mp3_read_probe(AVProbeData *p)

  246. {

  247.     int max_frames;

  248.     int fsize, frames;

  249.     uint32_t header;

  250.     uint8_t *buf, *buf2, *end;

  251.     AVCodecContext avctx;

  252. 

  253.     if(p->buf_size < ID3_HEADER_SIZE)

  254.         return 0;

  255. 

  256.     if(id3_match(p->buf))

  257.         return AVPROBE_SCORE_MAX;

  258. 

  259.     max_frames = 0;

  260.     buf = p->buf;

  261.     end = buf + FFMIN(4096, p->buf_size - sizeof(uint32_t));

  262. 

  263.     for(; buf < end; buf++) {

  264.         buf2 = buf;

  265. 

  266.         for(frames = 0; buf2 < end; frames++) {

  267.             header = (buf2[0] << 24) | (buf2[1] << 16) | (buf2[2] << 8) | buf2[3];

  268.             fsize = mpa_decode_header(&avctx, header);

  269.             if(fsize < 0)

  270.                 break;

  271.             buf2 += fsize;

  272.         }

  273.         max_frames = FFMAX(max_frames, frames);

  274.     }

  275.     if     (max_frames>=3) return AVPROBE_SCORE_MAX/2+1;

  276.     else if(max_frames==2) return AVPROBE_SCORE_MAX/4;

  277.     else if(max_frames==1) return 1;

  278.     else                   return 0;

  279. }

  280. 

  281. static int mp3_read_header(AVFormatContext *s,

  282.                            AVFormatParameters *ap)

  283. {

  284.     AVStream *st;

  285.     uint8_t buf[ID3_TAG_SIZE];

  286.     int len, ret, filesize;

  287. 

  288.     st = av_new_stream(s, 0);

  289.     if (!st)

  290.         return AVERROR_NOMEM;

  291. 

  292.     st->codec->codec_type = CODEC_TYPE_AUDIO;

  293.     st->codec->codec_id = CODEC_ID_MP3;

  294.     st->need_parsing = 1;

  295. 

  296.     /* try to get the TAG */

  297.     if (!url_is_streamed(&s->pb)) {

  298.         /* XXX: change that */

  299.         filesize = url_fsize(&s->pb);

  300.         if (filesize > 128) {

  301.             url_fseek(&s->pb, filesize - 128, SEEK_SET);

  302.             ret = get_buffer(&s->pb, buf, ID3_TAG_SIZE);

  303.             if (ret == ID3_TAG_SIZE) {

  304.                 id3_parse_tag(s, buf);

  305.             }

  306.             url_fseek(&s->pb, 0, SEEK_SET);

  307.         }

  308.     }

  309. 

  310.     /* if ID3 header found, skip it */

  311.     ret = get_buffer(&s->pb, buf, ID3_HEADER_SIZE);

  312.     if (ret != ID3_HEADER_SIZE)

  313.         return -1;

  314.     if (id3_match(buf)) {

  315.         /* skip ID3 header */

  316.         len = ((buf[6] & 0x7f) << 21) |

  317.             ((buf[7] & 0x7f) << 14) |

  318.             ((buf[8] & 0x7f) << 7) |

  319.             (buf[9] & 0x7f);

  320.         url_fskip(&s->pb, len);

  321.     } else {

  322.         url_fseek(&s->pb, 0, SEEK_SET);

  323.     }

  324. 

  325.     /* the parameters will be extracted from the compressed bitstream */

  326.     return 0;

  327. }

  328. 

  329. #define MP3_PACKET_SIZE 1024

  330. 

  331. static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)

  332. {

  333.     int ret, size;

  334.     //    AVStream *st = s->streams[0];

  335. 

  336.     size= MP3_PACKET_SIZE;

  337. 

  338.     ret= av_get_packet(&s->pb, pkt, size);

  339. 

  340.     pkt->stream_index = 0;

  341.     if (ret <= 0) {

  342.         return AVERROR_IO;

  343.     }

  344.     /* note: we need to modify the packet size here to handle the last

  345.        packet */

  346.     pkt->size = ret;

  347.     return ret;

  348. }

  349. 

  350. static int mp3_read_close(AVFormatContext *s)

  351. {

  352.     return 0;

  353. }

  354. 

  355. #ifdef CONFIG_MUXERS

  356. /* simple formats */

  357. static int mp3_write_header(struct AVFormatContext *s)

  358. {

  359.     return 0;

  360. }

  361. 

  362. static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)

  363. {

  364.     put_buffer(&s->pb, pkt->data, pkt->size);

  365.     put_flush_packet(&s->pb);

  366.     return 0;

  367. }

  368. 

  369. static int mp3_write_trailer(struct AVFormatContext *s)

  370. {

  371.     uint8_t buf[ID3_TAG_SIZE];

  372. 

  373.     /* write the id3 header */

  374.     if (s->title[0] != '\0') {

  375.         id3_create_tag(s, buf);

  376.         put_buffer(&s->pb, buf, ID3_TAG_SIZE);

  377.         put_flush_packet(&s->pb);

  378.     }

  379.     return 0;

  380. }

  381. #endif //CONFIG_MUXERS

  382. 

  383. #ifdef CONFIG_MP3_DEMUXER

  384. AVInputFormat mp3_demuxer = {

  385.     "mp3",

  386.     "MPEG audio",

  387.     0,

  388.     mp3_read_probe,

  389.     mp3_read_header,

  390.     mp3_read_packet,

  391.     mp3_read_close,

  392.     .extensions = "mp2,mp3,m2a", /* XXX: use probe */

  393. };

  394. #endif

  395. #ifdef CONFIG_MP2_MUXER

  396. AVOutputFormat mp2_muxer = {

  397.     "mp2",

  398.     "MPEG audio layer 2",

  399.     "audio/x-mpeg",

  400. #ifdef CONFIG_MP3LAME

  401.     "mp2,m2a",

  402. #else

  403.     "mp2,mp3,m2a",

  404. #endif

  405.     0,

  406.     CODEC_ID_MP2,

  407.     0,

  408.     mp3_write_header,

  409.     mp3_write_packet,

  410.     mp3_write_trailer,

  411. };

  412. #endif

  413. #ifdef CONFIG_MP3_MUXER

  414. AVOutputFormat mp3_muxer = {

  415.     "mp3",

  416.     "MPEG audio layer 3",

  417.     "audio/x-mpeg",

  418.     "mp3",

  419.     0,

  420.     CODEC_ID_MP3,

  421.     0,

  422.     mp3_write_header,

  423.     mp3_write_packet,

  424.     mp3_write_trailer,

  425. };

  426. #endif