--- /dev/null
+/*
+ * 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,
+ const uint8_t *buf, int size, int64_t 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;
+}
projects / synfig.git / blobdiff