push

ip/nomad.h

@@ -0,0 +1,103 @@
+/*
+ * Copyright 2008-2013 Various Authors
+ * Copyright 2004 Timo Hirvonen
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef CMUS_NOMAD_H
+#define CMUS_NOMAD_H
+
+#include <sys/types.h>
+
+#ifndef __GNUC__
+#include <unistd.h>
+#endif
+
+/* default callbacks use read, lseek, close */
+struct nomad_callbacks {
+	ssize_t (*read)(void *datasource, void *buffer, size_t count);
+	off_t (*lseek)(void *datasource, off_t offset, int whence);
+	int (*close)(void *datasource);
+};
+
+enum {
+	XING_FRAMES = 0x00000001L,
+	XING_BYTES  = 0x00000002L,
+	XING_TOC    = 0x00000004L,
+	XING_SCALE  = 0x00000008L
+};
+
+struct nomad_xing {
+	unsigned int is_info : 1;
+	unsigned int flags;
+	unsigned int nr_frames;
+	unsigned int bytes;
+	unsigned int scale;
+	unsigned char toc[100];
+};
+
+struct nomad_lame {
+	char encoder[10];   /* 9 byte encoder name/version ("LAME3.97b") */
+	int vbr_method;     /* VBR method */
+	float peak;         /* replaygain peak */
+	float trackGain;    /* replaygain track gain */
+	float albumGain;    /* replaygain album gain */
+	int encoderDelay;   /* # of added samples at start of mp3 */
+	int encoderPadding; /* # of added samples at end of mp3 */
+};
+
+/* always 16-bit signed little-endian */
+struct nomad_info {
+	double duration;
+	int sample_rate;
+	int channels;
+	int nr_frames;
+	int layer;
+	/* guessed */
+	int vbr;
+	/* guessed */
+	int avg_bitrate;
+	/* -1 if file not seekable */
+	off_t filesize;
+	unsigned int joint_stereo : 1;
+	unsigned int dual_channel : 1;
+};
+
+enum {
+	NOMAD_ERROR_SUCCESS,
+	NOMAD_ERROR_ERRNO,
+	NOMAD_ERROR_FILE_FORMAT
+};
+
+struct nomad;
+
+/* -NOMAD_ERROR_ERRNO -NOMAD_ERROR_FILE_FORMAT */
+int nomad_open_callbacks(struct nomad **nomadp, void *datasource,
+		struct nomad_callbacks *cbs);
+
+void nomad_close(struct nomad *nomad);
+
+/* -NOMAD_ERROR_ERRNO */
+int nomad_read(struct nomad *nomad, char *buffer, int count);
+
+/* -NOMAD_ERROR_ERRNO */
+int nomad_time_seek(struct nomad *nomad, double pos);
+
+const struct nomad_xing *nomad_xing(struct nomad *nomad);
+const struct nomad_lame *nomad_lame(struct nomad *nomad);
+const struct nomad_info *nomad_info(struct nomad *nomad);
+long nomad_current_bitrate(struct nomad *nomad);
+
+#endif