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/* 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;
}
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