diff options
Diffstat (limited to 'src/libmpg123/mpg123.c')
| -rwxr-xr-x | src/libmpg123/mpg123.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/src/libmpg123/mpg123.c b/src/libmpg123/mpg123.c new file mode 100755 index 0000000..1def17e --- /dev/null +++ b/src/libmpg123/mpg123.c @@ -0,0 +1,172 @@ +/* XMMS - Cross-platform multimedia player + * Copyright (C) 1998-2000 Peter Alm, Mikael Alm, Olle Hallnas, Thomas Nilsson and 4Front Technologies + * Copyright (C) 1999,2000 Håvard Kvålen + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +/* + * Note : removed code not used in EasyTAG + */ + +#include "mpg123.h" + + +double mpg123_compute_tpf(struct frame *fr) +{ + const int bs[4] = {0, 384, 1152, 1152}; + double tpf; + + tpf = bs[fr->lay]; + tpf /= mpg123_freqs[fr->sampling_frequency] << (fr->lsf); + return tpf; +} + + +static guint32 convert_to_header(guint8 * buf) +{ + + return (buf[0] << 24) + (buf[1] << 16) + (buf[2] << 8) + buf[3]; +} + + +#define DET_BUF_SIZE 1024 + +#if 0 /* Not used at the present time */ +static gboolean mpg123_detect_by_content(gchar *filename) +{ + FILE *file; + guchar tmp[4]; + guint32 head; + struct frame fr; + guchar buf[DET_BUF_SIZE]; + gint in_buf, i; + + if((file = fopen(filename, "rb")) == NULL) + return FALSE; + if (fread(tmp, 1, 4, file) != 4) + goto done; + head = convert_to_header(tmp); + while(!mpg123_head_check(head)) + { + /* + * The mpeg-stream can start anywhere in the file, + * so we check the entire file + */ + /* Optimize this */ + in_buf = fread(buf, 1, DET_BUF_SIZE, file); + if(in_buf == 0) + goto done; + + for (i = 0; i < in_buf; i++) + { + head <<= 8; + head |= buf[i]; + if(mpg123_head_check(head)) + { + fseek(file, i+1-in_buf, SEEK_CUR); + break; + } + } + } + if (mpg123_decode_header(&fr, head)) + { + /* + * We found something which looks like a MPEG-header. + * We check the next frame too, to be sure + */ + + if (fseek(file, fr.framesize, SEEK_CUR) != 0) + goto done; + if (fread(tmp, 1, 4, file) != 4) + goto done; + head = convert_to_header(tmp); + if (mpg123_head_check(head) && mpg123_decode_header(&fr, head)) + { + fclose(file); + return TRUE; + } + } + + done: + fclose(file); + return FALSE; +} +#endif + +//static guint get_song_time(FILE * file) +guint mpg123_get_song_time(FILE * file) +{ + guint32 head; + guchar tmp[4], *buf; + struct frame frm; + XHEADDATA xing_header; + double tpf, bpf; + guint32 len; + long id3v2size = 0; + + if (!file) + return -1; + + fseek(file, 0, SEEK_SET); + if (fread(tmp, 1, 4, file) != 4) + return 0; + + // Skip data of the ID3v2.x tag (patch from Artur Polaczynski) + if (tmp[0] == 'I' && tmp[1] == 'D' && tmp[2] == '3' && tmp[3] < 0xFF) + { + // id3v2 tag skipeer $49 44 33 yy yy xx zz zz zz zz [zz size] + fseek(file, 2, SEEK_CUR); // Size is 6-9 position + if (fread(tmp, 1, 4, file) != 4) + return 0; + id3v2size = 10 + ( (long)(tmp[3]) | ((long)(tmp[2]) << 7) | ((long)(tmp[1]) << 14) | ((long)(tmp[0]) << 21) ); + fseek(file, id3v2size, SEEK_SET); + if (fread(tmp, 1, 4, file) != 4) // Read mpeg header + return 0; + } + + head = convert_to_header(tmp); + while (!mpg123_head_check(head)) + { + head <<= 8; + if (fread(tmp, 1, 1, file) != 1) + return 0; + head |= tmp[0]; + } + if (mpg123_decode_header(&frm, head)) + { + buf = g_malloc(frm.framesize + 4); + fseek(file, -4, SEEK_CUR); + fread(buf, 1, frm.framesize + 4, file); + xing_header.toc = NULL; + tpf = mpg123_compute_tpf(&frm); + if (mpg123_get_xing_header(&xing_header, buf)) + { + g_free(buf); + return ((guint) (tpf * xing_header.frames * 1000)); + } + g_free(buf); + bpf = mpg123_compute_bpf(&frm); + fseek(file, 0, SEEK_END); + len = ftell(file) - id3v2size; + fseek(file, -128, SEEK_END); + fread(tmp, 1, 3, file); + if (!strncmp(tmp, "TAG", 3)) + len -= 128; + return ((guint) ((guint)(len / bpf) * tpf * 1000)); + } + return 0; +} + |