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-rw-r--r--flow/gsl/gslloader-mad.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/flow/gsl/gslloader-mad.c b/flow/gsl/gslloader-mad.c
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+++ b/flow/gsl/gslloader-mad.c
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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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