ID3 parsing and generation in MP3 format

Originally committed as revision 2237 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 397 insertions, 0 deletions

diff --git a/libavformat/mp3.c b/libavformat/mp3.c
new file mode 100644
index 0000000000..fa27283fc9
--- /dev/null
+++ b/libavformat/mp3.c
@@ -0,0 +1,397 @@
+/* 
+ * MP3 encoder and decoder
+ * Copyright (c) 2003 Fabrice Bellard.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "avformat.h"
+
+#define ID3_HEADER_SIZE 10
+#define ID3_TAG_SIZE 128
+
+#define ID3_GENRE_MAX 125
+
+static const char *id3_genre_str[ID3_GENRE_MAX + 1] = {
+    [0] = "Blues",
+    [1] = "Classic Rock",
+    [2] = "Country",
+    [3] = "Dance",
+    [4] = "Disco",
+    [5] = "Funk",
+    [6] = "Grunge",
+    [7] = "Hip-Hop",
+    [8] = "Jazz",
+    [9] = "Metal",
+    [10] = "New Age",
+    [11] = "Oldies",
+    [12] = "Other",
+    [13] = "Pop",
+    [14] = "R&B",
+    [15] = "Rap",
+    [16] = "Reggae",
+    [17] = "Rock",
+    [18] = "Techno",
+    [19] = "Industrial",
+    [20] = "Alternative",
+    [21] = "Ska",
+    [22] = "Death Metal",
+    [23] = "Pranks",
+    [24] = "Soundtrack",
+    [25] = "Euro-Techno",
+    [26] = "Ambient",
+    [27] = "Trip-Hop",
+    [28] = "Vocal",
+    [29] = "Jazz+Funk",
+    [30] = "Fusion",
+    [31] = "Trance",
+    [32] = "Classical",
+    [33] = "Instrumental",
+    [34] = "Acid",
+    [35] = "House",
+    [36] = "Game",
+    [37] = "Sound Clip",
+    [38] = "Gospel",
+    [39] = "Noise",
+    [40] = "AlternRock",
+    [41] = "Bass",
+    [42] = "Soul",
+    [43] = "Punk",
+    [44] = "Space",
+    [45] = "Meditative",
+    [46] = "Instrumental Pop",
+    [47] = "Instrumental Rock",
+    [48] = "Ethnic",
+    [49] = "Gothic",
+    [50] = "Darkwave",
+    [51] = "Techno-Industrial",
+    [52] = "Electronic",
+    [53] = "Pop-Folk",
+    [54] = "Eurodance",
+    [55] = "Dream",
+    [56] = "Southern Rock",
+    [57] = "Comedy",
+    [58] = "Cult",
+    [59] = "Gangsta",
+    [60] = "Top 40",
+    [61] = "Christian Rap",
+    [62] = "Pop/Funk",
+    [63] = "Jungle",
+    [64] = "Native American",
+    [65] = "Cabaret",
+    [66] = "New Wave",
+    [67] = "Psychadelic",
+    [68] = "Rave",
+    [69] = "Showtunes",
+    [70] = "Trailer",
+    [71] = "Lo-Fi",
+    [72] = "Tribal",
+    [73] = "Acid Punk",
+    [74] = "Acid Jazz",
+    [75] = "Polka",
+    [76] = "Retro",
+    [77] = "Musical",
+    [78] = "Rock & Roll",
+    [79] = "Hard Rock",
+    [80] = "Folk",
+    [81] = "Folk-Rock",
+    [82] = "National Folk",
+    [83] = "Swing",
+    [84] = "Fast Fusion",
+    [85] = "Bebob",
+    [86] = "Latin",
+    [87] = "Revival",
+    [88] = "Celtic",
+    [89] = "Bluegrass",
+    [90] = "Avantgarde",
+    [91] = "Gothic Rock",
+    [92] = "Progressive Rock",
+    [93] = "Psychedelic Rock",
+    [94] = "Symphonic Rock",
+    [95] = "Slow Rock",
+    [96] = "Big Band",
+    [97] = "Chorus",
+    [98] = "Easy Listening",
+    [99] = "Acoustic",
+    [100] = "Humour",
+    [101] = "Speech",
+    [102] = "Chanson",
+    [103] = "Opera",
+    [104] = "Chamber Music",
+    [105] = "Sonata",
+    [106] = "Symphony",
+    [107] = "Booty Bass",
+    [108] = "Primus",
+    [109] = "Porn Groove",
+    [110] = "Satire",
+    [111] = "Slow Jam",
+    [112] = "Club",
+    [113] = "Tango",
+    [114] = "Samba",
+    [115] = "Folklore",
+    [116] = "Ballad",
+    [117] = "Power Ballad",
+    [118] = "Rhythmic Soul",
+    [119] = "Freestyle",
+    [120] = "Duet",
+    [121] = "Punk Rock",
+    [122] = "Drum Solo",
+    [123] = "A capella",
+    [124] = "Euro-House",
+    [125] = "Dance Hall",
+};
+
+/* buf must be ID3_HEADER_SIZE byte long */
+static int id3_match(const uint8_t *buf)
+{
+    return (buf[0] == 'I' &&
+            buf[1] == 'D' &&
+            buf[2] == '3' &&
+            buf[3] != 0xff &&
+            buf[4] != 0xff &&
+            (buf[6] & 0x80) == 0 &&
+            (buf[7] & 0x80) == 0 &&
+            (buf[8] & 0x80) == 0 &&
+            (buf[9] & 0x80) == 0);
+}
+
+static void id3_get_string(char *str, int str_size, 
+                           const uint8_t *buf, int buf_size)
+{
+    int i, c;
+    char *q;
+
+    q = str;
+    for(i = 0; i < buf_size; i++) {
+        c = buf[i];
+        if (c == '\0')
+            break;
+        if ((q - str) >= str_size - 1)
+            break;
+        *q++ = c;
+    }
+    *q = '\0';
+}
+
+/* 'buf' must be ID3_TAG_SIZE byte long */
+static int id3_parse_tag(AVFormatContext *s, const uint8_t *buf)
+{
+    char str[5];
+    int genre;
+    
+    if (!(buf[0] == 'T' &&
+          buf[1] == 'A' &&
+          buf[2] == 'G'))
+        return -1;
+    id3_get_string(s->title, sizeof(s->title), buf + 3, 30);
+    id3_get_string(s->author, sizeof(s->author), buf + 33, 30);
+    id3_get_string(s->album, sizeof(s->album), buf + 63, 30);
+    id3_get_string(str, sizeof(str), buf + 93, 4);
+    s->year = atoi(str);
+    id3_get_string(s->comment, sizeof(s->comment), buf + 97, 30);
+    if (buf[125] == 0 && buf[126] != 0)
+        s->track = buf[126];
+    genre = buf[127];
+    if (genre <= ID3_GENRE_MAX)
+        pstrcpy(s->genre, sizeof(s->genre), id3_genre_str[genre]);
+    return 0;
+}
+
+static void id3_create_tag(AVFormatContext *s, uint8_t *buf)
+{
+    int v, i;
+
+    memset(buf, 0, ID3_TAG_SIZE); /* fail safe */
+    buf[0] = 'T';
+    buf[1] = 'A';
+    buf[2] = 'G';
+    strncpy(buf + 3, s->title, 30);
+    strncpy(buf + 33, s->author, 30);
+    strncpy(buf + 63, s->album, 30);
+    v = s->year;
+    if (v > 0) {
+        for(i = 0;i < 4; i++) {
+            buf[96 - i] = '0' + (v % 10);
+            v = v / 10;
+        }
+    }
+    strncpy(buf + 97, s->comment, 30);
+    if (s->track != 0) {
+        buf[125] = 0;
+        buf[126] = s->track;
+    }
+    for(i = 0; i <= ID3_GENRE_MAX; i++) {
+        if (!strcasecmp(s->genre, id3_genre_str[i])) {
+            buf[127] = i;
+            break;
+        }
+    }
+}
+
+/* mp3 read */
+static int mp3_read_header(AVFormatContext *s,
+                           AVFormatParameters *ap)
+{
+    AVStream *st;
+    uint8_t buf[ID3_TAG_SIZE];
+    int len, ret, filesize;
+
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+
+    st->codec.codec_type = CODEC_TYPE_AUDIO;
+    st->codec.codec_id = CODEC_ID_MP3;
+
+    /* try to get the TAG */
+    if (!url_is_streamed(&s->pb)) {
+        /* XXX: change that */
+        filesize = url_filesize(url_fileno(&s->pb));
+        if (filesize > 128) {
+            url_fseek(&s->pb, filesize - 128, SEEK_SET);
+            ret = get_buffer(&s->pb, buf, ID3_TAG_SIZE);
+            if (ret == ID3_TAG_SIZE) {
+                id3_parse_tag(s, buf);
+            }
+            url_fseek(&s->pb, 0, SEEK_SET);
+        }
+    }
+
+    /* if ID3 header found, skip it */
+    ret = get_buffer(&s->pb, buf, ID3_HEADER_SIZE);
+    if (ret != ID3_HEADER_SIZE)
+        return -1;
+    if (id3_match(buf)) {
+        /* skip ID3 header */
+        len = ((buf[6] & 0x7f) << 21) |
+            ((buf[7] & 0x7f) << 14) |
+            ((buf[8] & 0x7f) << 7) |
+            (buf[9] & 0x7f);
+        url_fskip(&s->pb, len);
+    } else {
+        url_fseek(&s->pb, 0, SEEK_SET);
+    }
+
+    /* the parameters will be extracted from the compressed bitstream */
+    return 0;
+}
+
+#define MP3_PACKET_SIZE 1024
+
+static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int ret, size;
+    //    AVStream *st = s->streams[0];
+    
+    size= MP3_PACKET_SIZE;
+
+    if (av_new_packet(pkt, size) < 0)
+        return -EIO;
+
+    pkt->stream_index = 0;
+    ret = get_buffer(&s->pb, pkt->data, size);
+    if (ret <= 0) {
+        av_free_packet(pkt);
+        return -EIO;
+    }
+    /* note: we need to modify the packet size here to handle the last
+       packet */
+    pkt->size = ret;
+    return ret;
+}
+
+static int mp3_read_close(AVFormatContext *s)
+{
+    return 0;
+}
+
+/* simple formats */
+static int mp3_write_header(struct AVFormatContext *s)
+{
+    return 0;
+}
+
+static int mp3_write_packet(struct AVFormatContext *s, int stream_index,
+			    unsigned char *buf, int size, int force_pts)
+{
+    put_buffer(&s->pb, buf, size);
+    put_flush_packet(&s->pb);
+    return 0;
+}
+
+static int mp3_write_trailer(struct AVFormatContext *s)
+{
+    uint8_t buf[ID3_TAG_SIZE];
+
+    /* write the id3 header */
+    if (s->title[0] != '\0') {
+        id3_create_tag(s, buf);
+        put_buffer(&s->pb, buf, ID3_TAG_SIZE);
+        put_flush_packet(&s->pb);
+    }
+    return 0;
+}
+
+AVInputFormat mp3_iformat = {
+    "mp3",
+    "MPEG audio",
+    0,
+    NULL,
+    mp3_read_header,
+    mp3_read_packet,
+    mp3_read_close,
+    .extensions = "mp2,mp3", /* XXX: use probe */
+};
+
+AVOutputFormat mp2_oformat = {
+    "mp2",
+    "MPEG audio layer 2",
+    "audio/x-mpeg",
+#ifdef CONFIG_MP3LAME
+    "mp2",
+#else
+    "mp2,mp3",
+#endif
+    0,
+    CODEC_ID_MP2,
+    0,
+    mp3_write_header,
+    mp3_write_packet,
+    mp3_write_trailer,
+};
+
+#ifdef CONFIG_MP3LAME
+AVOutputFormat mp3_oformat = {
+    "mp3",
+    "MPEG audio layer 3",
+    "audio/x-mpeg",
+    "mp3",
+    0,
+    CODEC_ID_MP3,
+    0,
+    mp3_write_header,
+    mp3_write_packet,
+    mp3_write_trailer,
+};
+#endif
+
+int mp3_init(void)
+{
+    av_register_input_format(&mp3_iformat);
+    av_register_output_format(&mp2_oformat);
+#ifdef CONFIG_MP3LAME
+    av_register_output_format(&mp3_oformat);
+#endif    
+    return 0;
+}