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/* GSL - Generic Sound Layer
* Copyright (C) 2002 Tim Janik
*
* 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 "gsl/gslloader.h"
#include <gsl/gsldatahandle.h>
#include "gsldatahandle-mad.h"
#include <unistd.h>
/* --- structures --- */
typedef struct
{
GslWaveFileInfo wfi;
guint n_channels;
gfloat mix_freq;
gfloat osc_freq;
} FileInfo;
/* --- functions --- */
static GslWaveFileInfo*
mad_load_file_info (gpointer data,
const gchar *file_name,
GslErrorType *error_p)
{
FileInfo *fi;
guint n_channels;
gfloat mix_freq;
GslErrorType error;
error = gsl_data_handle_mad_testopen (file_name, &n_channels, &mix_freq);
if (error)
{
*error_p = error;
return NULL;
}
fi = gsl_new_struct0 (FileInfo, 1);
fi->wfi.n_waves = 1; /* we support only a single MPEG stream */
fi->wfi.waves = g_malloc0 (sizeof (fi->wfi.waves[0]) * fi->wfi.n_waves);
fi->wfi.waves[0].name = g_strdup (file_name);
fi->n_channels = n_channels;
fi->mix_freq = mix_freq;
fi->osc_freq = 440.0; /* FIXME */
return &fi->wfi;
}
static void
mad_free_file_info (gpointer data,
GslWaveFileInfo *file_info)
{
FileInfo *fi = (FileInfo*) file_info;
guint i;
for (i = 0; i < fi->wfi.n_waves; i++)
g_free (fi->wfi.waves[i].name);
g_free (fi->wfi.waves);
gsl_delete_struct (FileInfo, fi);
}
static GslWaveDsc*
mad_load_wave_dsc (gpointer data,
GslWaveFileInfo *file_info,
guint nth_wave,
GslErrorType *error_p)
{
FileInfo *fi = (FileInfo*) file_info;
GslWaveDsc *wdsc = gsl_new_struct0 (GslWaveDsc, 1);
wdsc->name = g_strdup (fi->wfi.waves[0].name);
wdsc->n_channels = fi->n_channels;
wdsc->n_chunks = 1;
wdsc->chunks = g_new0 (GslWaveChunkDsc, 1);
wdsc->chunks[0].osc_freq = fi->osc_freq;
wdsc->chunks[0].mix_freq = fi->mix_freq;
return wdsc;
}
static void
mad_free_wave_dsc (gpointer data,
GslWaveDsc *wdsc)
{
g_free (wdsc->name);
g_free (wdsc->chunks);
gsl_delete_struct (GslWaveDsc, wdsc);
}
static GslDataHandle*
mad_create_chunk_handle (gpointer data,
GslWaveDsc *wdsc,
guint nth_chunk,
GslErrorType *error_p)
{
FileInfo *fi = (FileInfo*) wdsc->file_info;
GslDataHandle *dhandle;
g_return_val_if_fail (nth_chunk == 0, NULL);
dhandle = gsl_data_handle_new_mad (fi->wfi.file_name);
if (!dhandle)
*error_p = GSL_ERROR_OPEN_FAILED;
return dhandle;
}
#define MAGIC_MPEG_HEADER "0 beshort &0xffe0\n" /* MPEG */ \
"2 ubyte&0x0c <0x0c\n" /* valid samplefreq */ \
"2 ubyte&0xf0 <0xf0\n" /* valid bitrate */
#define MAGIC_MPEG10_I (MAGIC_MPEG_HEADER \
"1 byte&0x18 =0x18\n" /* 1.0 */ \
"1 byte&0x06 =0x06\n" /* I */)
#define MAGIC_MPEG10_II (MAGIC_MPEG_HEADER \
"1 byte&0x18 =0x18\n" /* 1.0 */ \
"1 byte&0x06 =0x04\n" /* II */)
#define MAGIC_MPEG10_III (MAGIC_MPEG_HEADER \
"1 byte&0x18 =0x18\n" /* 1.0 */ \
"1 byte&0x06 =0x02\n" /* III */)
#define MAGIC_MPEG20_I (MAGIC_MPEG_HEADER \
"1 byte&0x18 =0x10\n" /* 2.0 */ \
"1 byte&0x06 =0x06\n" /* I */)
#define MAGIC_MPEG20_II (MAGIC_MPEG_HEADER \
"1 byte&0x18 =0x10\n" /* 2.0 */ \
"1 byte&0x06 =0x04\n" /* II */)
#define MAGIC_MPEG20_III (MAGIC_MPEG_HEADER \
"1 byte&0x18 =0x10\n" /* 2.0 */ \
"1 byte&0x06 =0x02\n" /* III */)
#define MAGIC_MPEG25_I (MAGIC_MPEG_HEADER \
"1 byte&0x18 =0x00\n" /* 2.5 */ \
"1 byte&0x06 =0x06\n" /* I */)
#define MAGIC_MPEG25_II (MAGIC_MPEG_HEADER \
"1 byte&0x18 =0x00\n" /* 2.5 */ \
"1 byte&0x06 =0x04\n" /* II */)
#define MAGIC_MPEG25_III (MAGIC_MPEG_HEADER \
"1 byte&0x18 =0x00\n" /* 2.5 */ \
"1 byte&0x06 =0x02\n" /* III */)
#define MAGIC_RIFF_MPEG ("0 string RIFF\n" \
"8 string WAVE\n" \
"12 string fmt\\s\n" /* "fmt " */ \
"20 leshort 80\n" /* format: MPEG */)
#define MAGIC_RIFF_MPEG_III ("0 string RIFF\n" \
"8 string WAVE\n" \
"12 string fmt\\s\n" /* "fmt " */ \
"20 leshort 85\n" /* format: MPEG III */)
#define MAGIC_MPEG_ID3 ("0 string ID3\n" /* ID3v2 tag for mp3 */ \
"3 ubyte <0xff\n" /* major version */ \
"4 ubyte <0xff\n" /* revision */)
void
_gsl_init_loader_mad (void)
{
static const gchar *file_exts[] = {
"mp1", "mp2", "mp3",
NULL,
};
static const gchar *mime_types[] = {
"audio/mp3", "audio/x-mp3", "audio/mpg3", "audio/x-mpg3", "audio/mpeg3", "audio/x-mpeg3",
"audio/mp2", "audio/x-mp2", "audio/mpg2", "audio/x-mpg2", "audio/mpeg2", "audio/x-mpeg2",
"audio/mp1", "audio/x-mp1", "audio/mpg1", "audio/x-mpg1", "audio/mpeg1", "audio/x-mpeg1",
"audio/mpeg", "audio/x-mpeg",
NULL,
};
static const gchar *magics[] = {
MAGIC_MPEG10_I, MAGIC_MPEG10_II, MAGIC_MPEG10_III,
MAGIC_MPEG20_I, MAGIC_MPEG20_II, MAGIC_MPEG20_III,
MAGIC_MPEG25_I, MAGIC_MPEG25_II, MAGIC_MPEG25_III,
MAGIC_RIFF_MPEG, MAGIC_RIFF_MPEG_III,
MAGIC_MPEG_ID3,
NULL,
};
static GslLoader loader = {
"MPEG Audio (MAD: MPEG 1.0/2.0/2.5 Layer III/II/I Decoder)",
file_exts,
mime_types,
magics,
0, /* priority */
NULL,
mad_load_file_info,
mad_free_file_info,
mad_load_wave_dsc,
mad_free_wave_dsc,
mad_create_chunk_handle,
};
static gboolean initialized = FALSE;
g_assert (initialized == FALSE);
initialized = TRUE;
if (GSL_HAVE_LIBMAD)
gsl_loader_register (&loader);
}
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