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authorWarren Dukes <warren.dukes@gmail.com>2004-02-23 23:41:20 +0000
committerWarren Dukes <warren.dukes@gmail.com>2004-02-23 23:41:20 +0000
commitd35747a40c7dea12de95f78a4f283a45ef687597 (patch)
tree3a85f138e68c7ef3e5a9ece863ed7266ad1cd7ce /src/libmad/frame.h
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import from SF CVS
git-svn-id: https://svn.musicpd.org/mpd/trunk@1 09075e82-0dd4-0310-85a5-a0d7c8717e4f
Diffstat (limited to 'src/libmad/frame.h')
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diff --git a/src/libmad/frame.h b/src/libmad/frame.h
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+/*
+ * libmad - MPEG audio decoder library
+ * Copyright (C) 2000-2003 Underbit Technologies, Inc.
+ *
+ * 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
+ *
+ * $Id: frame.h,v 1.1 2003/08/14 03:57:13 shank Exp $
+ */
+
+# ifndef LIBMAD_FRAME_H
+# define LIBMAD_FRAME_H
+
+# include "fixed.h"
+# include "timer.h"
+# include "stream.h"
+
+enum mad_layer {
+ MAD_LAYER_I = 1, /* Layer I */
+ MAD_LAYER_II = 2, /* Layer II */
+ MAD_LAYER_III = 3 /* Layer III */
+};
+
+enum mad_mode {
+ MAD_MODE_SINGLE_CHANNEL = 0, /* single channel */
+ MAD_MODE_DUAL_CHANNEL = 1, /* dual channel */
+ MAD_MODE_JOINT_STEREO = 2, /* joint (MS/intensity) stereo */
+ MAD_MODE_STEREO = 3 /* normal LR stereo */
+};
+
+enum mad_emphasis {
+ MAD_EMPHASIS_NONE = 0, /* no emphasis */
+ MAD_EMPHASIS_50_15_US = 1, /* 50/15 microseconds emphasis */
+ MAD_EMPHASIS_CCITT_J_17 = 3, /* CCITT J.17 emphasis */
+ MAD_EMPHASIS_RESERVED = 2 /* unknown emphasis */
+};
+
+struct mad_header {
+ enum mad_layer layer; /* audio layer (1, 2, or 3) */
+ enum mad_mode mode; /* channel mode (see above) */
+ int mode_extension; /* additional mode info */
+ enum mad_emphasis emphasis; /* de-emphasis to use (see above) */
+
+ unsigned long bitrate; /* stream bitrate (bps) */
+ unsigned int samplerate; /* sampling frequency (Hz) */
+
+ unsigned short crc_check; /* frame CRC accumulator */
+ unsigned short crc_target; /* final target CRC checksum */
+
+ int flags; /* flags (see below) */
+ int private_bits; /* private bits (see below) */
+
+ mad_timer_t duration; /* audio playing time of frame */
+};
+
+struct mad_frame {
+ struct mad_header header; /* MPEG audio header */
+
+ int options; /* decoding options (from stream) */
+
+ mad_fixed_t sbsample[2][36][32]; /* synthesis subband filter samples */
+ mad_fixed_t (*overlap)[2][32][18]; /* Layer III block overlap data */
+};
+
+# define MAD_NCHANNELS(header) ((header)->mode ? 2 : 1)
+# define MAD_NSBSAMPLES(header) \
+ ((header)->layer == MAD_LAYER_I ? 12 : \
+ (((header)->layer == MAD_LAYER_III && \
+ ((header)->flags & MAD_FLAG_LSF_EXT)) ? 18 : 36))
+
+enum {
+ MAD_FLAG_NPRIVATE_III = 0x0007, /* number of Layer III private bits */
+ MAD_FLAG_INCOMPLETE = 0x0008, /* header but not data is decoded */
+
+ MAD_FLAG_PROTECTION = 0x0010, /* frame has CRC protection */
+ MAD_FLAG_COPYRIGHT = 0x0020, /* frame is copyright */
+ MAD_FLAG_ORIGINAL = 0x0040, /* frame is original (else copy) */
+ MAD_FLAG_PADDING = 0x0080, /* frame has additional slot */
+
+ MAD_FLAG_I_STEREO = 0x0100, /* uses intensity joint stereo */
+ MAD_FLAG_MS_STEREO = 0x0200, /* uses middle/side joint stereo */
+ MAD_FLAG_FREEFORMAT = 0x0400, /* uses free format bitrate */
+
+ MAD_FLAG_LSF_EXT = 0x1000, /* lower sampling freq. extension */
+ MAD_FLAG_MC_EXT = 0x2000, /* multichannel audio extension */
+ MAD_FLAG_MPEG_2_5_EXT = 0x4000 /* MPEG 2.5 (unofficial) extension */
+};
+
+enum {
+ MAD_PRIVATE_HEADER = 0x0100, /* header private bit */
+ MAD_PRIVATE_III = 0x001f /* Layer III private bits (up to 5) */
+};
+
+void mad_header_init(struct mad_header *);
+
+# define mad_header_finish(header) /* nothing */
+
+int mad_header_decode(struct mad_header *, struct mad_stream *);
+
+void mad_frame_init(struct mad_frame *);
+void mad_frame_finish(struct mad_frame *);
+
+int mad_frame_decode(struct mad_frame *, struct mad_stream *);
+
+void mad_frame_mute(struct mad_frame *);
+
+# endif