Andreas Grün / Mbed 2 deprecated madplayer

MP3 Player without external hardware MP3 Player without external hardware. A software based MP3 player based on a modified version of libmad. Mono output (at the moment) via AnalogOut. Files are read from an USB drive. This is a demo program, it plays only one file at the moment. Documentation is in "main.cpp" and "config.h"

Dependencies:   mbed

frame.h@2:f28cf0afd021, 2010-11-27 (annotated)

Committer:
Gruenfrosch
Date:
Sat Nov 27 17:27:33 2010 +0000
Revision:
2:f28cf0afd021
Parent:
0:7627c79db971 
Version 3:

 * moved another memory block into AHB RAM, giving more room for

 * stereo buffer.

 * moved content of decode() to main()

 * decoding	is now safe to be called multiple times (bug in older versions)

 * Output routine now fills stereo buffer, DAC output sums channels,

 * just for demonstration that stereo output could go here

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Gruenfrosch 0:7627c79db971 1 /*
Gruenfrosch 0:7627c79db971 2 * libmad - MPEG audio decoder library
Gruenfrosch 0:7627c79db971 3 * Copyright (C) 2000-2004 Underbit Technologies, Inc.
Gruenfrosch 0:7627c79db971 4 *
Gruenfrosch 0:7627c79db971 5 * This program is free software; you can redistribute it and/or modify
Gruenfrosch 0:7627c79db971 6 * it under the terms of the GNU General Public License as published by
Gruenfrosch 0:7627c79db971 7 * the Free Software Foundation; either version 2 of the License, or
Gruenfrosch 0:7627c79db971 8 * (at your option) any later version.
Gruenfrosch 0:7627c79db971 9 *
Gruenfrosch 0:7627c79db971 10 * This program is distributed in the hope that it will be useful,
Gruenfrosch 0:7627c79db971 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
Gruenfrosch 0:7627c79db971 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Gruenfrosch 0:7627c79db971 13 * GNU General Public License for more details.
Gruenfrosch 0:7627c79db971 14 *
Gruenfrosch 0:7627c79db971 15 * You should have received a copy of the GNU General Public License
Gruenfrosch 0:7627c79db971 16 * along with this program; if not, write to the Free Software
Gruenfrosch 0:7627c79db971 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Gruenfrosch 0:7627c79db971 18 *
Gruenfrosch 0:7627c79db971 19 * $Id: frame.h,v 1.1 2010/11/23 20:12:57 andy Exp $
Gruenfrosch 0:7627c79db971 20 */
Gruenfrosch 0:7627c79db971 21
Gruenfrosch 0:7627c79db971 22 # ifndef LIBMAD_FRAME_H
Gruenfrosch 0:7627c79db971 23 # define LIBMAD_FRAME_H
Gruenfrosch 0:7627c79db971 24
Gruenfrosch 0:7627c79db971 25 # include "fixed.h"
Gruenfrosch 0:7627c79db971 26 # include "timer.h"
Gruenfrosch 0:7627c79db971 27 # include "stream.h"
Gruenfrosch 0:7627c79db971 28
Gruenfrosch 0:7627c79db971 29 enum mad_layer {
Gruenfrosch 0:7627c79db971 30 MAD_LAYER_I = 1, /* Layer I */
Gruenfrosch 0:7627c79db971 31 MAD_LAYER_II = 2, /* Layer II */
Gruenfrosch 0:7627c79db971 32 MAD_LAYER_III = 3 /* Layer III */
Gruenfrosch 0:7627c79db971 33 };
Gruenfrosch 0:7627c79db971 34
Gruenfrosch 0:7627c79db971 35 enum mad_mode {
Gruenfrosch 0:7627c79db971 36 MAD_MODE_SINGLE_CHANNEL = 0, /* single channel */
Gruenfrosch 0:7627c79db971 37 MAD_MODE_DUAL_CHANNEL = 1, /* dual channel */
Gruenfrosch 0:7627c79db971 38 MAD_MODE_JOINT_STEREO = 2, /* joint (MS/intensity) stereo */
Gruenfrosch 0:7627c79db971 39 MAD_MODE_STEREO = 3 /* normal LR stereo */
Gruenfrosch 0:7627c79db971 40 };
Gruenfrosch 0:7627c79db971 41
Gruenfrosch 0:7627c79db971 42 enum mad_emphasis {
Gruenfrosch 0:7627c79db971 43 MAD_EMPHASIS_NONE = 0, /* no emphasis */
Gruenfrosch 0:7627c79db971 44 MAD_EMPHASIS_50_15_US = 1, /* 50/15 microseconds emphasis */
Gruenfrosch 0:7627c79db971 45 MAD_EMPHASIS_CCITT_J_17 = 3, /* CCITT J.17 emphasis */
Gruenfrosch 0:7627c79db971 46 MAD_EMPHASIS_RESERVED = 2 /* unknown emphasis */
Gruenfrosch 0:7627c79db971 47 };
Gruenfrosch 0:7627c79db971 48
Gruenfrosch 0:7627c79db971 49 struct mad_header {
Gruenfrosch 0:7627c79db971 50 enum mad_layer layer; /* audio layer (1, 2, or 3) */
Gruenfrosch 0:7627c79db971 51 enum mad_mode mode; /* channel mode (see above) */
Gruenfrosch 0:7627c79db971 52 int mode_extension; /* additional mode info */
Gruenfrosch 0:7627c79db971 53 enum mad_emphasis emphasis; /* de-emphasis to use (see above) */
Gruenfrosch 0:7627c79db971 54
Gruenfrosch 0:7627c79db971 55 unsigned long bitrate; /* stream bitrate (bps) */
Gruenfrosch 0:7627c79db971 56 unsigned int samplerate; /* sampling frequency (Hz) */
Gruenfrosch 0:7627c79db971 57
Gruenfrosch 0:7627c79db971 58 unsigned short crc_check; /* frame CRC accumulator */
Gruenfrosch 0:7627c79db971 59 unsigned short crc_target; /* final target CRC checksum */
Gruenfrosch 0:7627c79db971 60
Gruenfrosch 0:7627c79db971 61 int flags; /* flags (see below) */
Gruenfrosch 0:7627c79db971 62 int private_bits; /* private bits (see below) */
Gruenfrosch 0:7627c79db971 63
Gruenfrosch 0:7627c79db971 64 mad_timer_t duration; /* audio playing time of frame */
Gruenfrosch 0:7627c79db971 65 };
Gruenfrosch 0:7627c79db971 66
Gruenfrosch 0:7627c79db971 67 struct mad_frame {
Gruenfrosch 0:7627c79db971 68 struct mad_header header; /* MPEG audio header */
Gruenfrosch 0:7627c79db971 69
Gruenfrosch 0:7627c79db971 70 int options; /* decoding options (from stream) */
Gruenfrosch 0:7627c79db971 71
Gruenfrosch 0:7627c79db971 72 mad_fixed_t sbsample[2][36][32]; /* synthesis subband filter samples */
Gruenfrosch 2:f28cf0afd021 73 mad_fixed_t overlap[2][32][18]; /* Layer III block overlap data */
Gruenfrosch 0:7627c79db971 74 };
Gruenfrosch 0:7627c79db971 75
Gruenfrosch 0:7627c79db971 76 # define MAD_NCHANNELS(header) ((header)->mode ? 2 : 1)
Gruenfrosch 0:7627c79db971 77 # define MAD_NSBSAMPLES(header) \
Gruenfrosch 0:7627c79db971 78 ((header)->layer == MAD_LAYER_I ? 12 : \
Gruenfrosch 0:7627c79db971 79 (((header)->layer == MAD_LAYER_III && \
Gruenfrosch 0:7627c79db971 80 ((header)->flags & MAD_FLAG_LSF_EXT)) ? 18 : 36))
Gruenfrosch 0:7627c79db971 81
Gruenfrosch 0:7627c79db971 82 enum {
Gruenfrosch 0:7627c79db971 83 MAD_FLAG_NPRIVATE_III = 0x0007, /* number of Layer III private bits */
Gruenfrosch 0:7627c79db971 84 MAD_FLAG_INCOMPLETE = 0x0008, /* header but not data is decoded */
Gruenfrosch 0:7627c79db971 85
Gruenfrosch 0:7627c79db971 86 MAD_FLAG_PROTECTION = 0x0010, /* frame has CRC protection */
Gruenfrosch 0:7627c79db971 87 MAD_FLAG_COPYRIGHT = 0x0020, /* frame is copyright */
Gruenfrosch 0:7627c79db971 88 MAD_FLAG_ORIGINAL = 0x0040, /* frame is original (else copy) */
Gruenfrosch 0:7627c79db971 89 MAD_FLAG_PADDING = 0x0080, /* frame has additional slot */
Gruenfrosch 0:7627c79db971 90
Gruenfrosch 0:7627c79db971 91 MAD_FLAG_I_STEREO = 0x0100, /* uses intensity joint stereo */
Gruenfrosch 0:7627c79db971 92 MAD_FLAG_MS_STEREO = 0x0200, /* uses middle/side joint stereo */
Gruenfrosch 0:7627c79db971 93 MAD_FLAG_FREEFORMAT = 0x0400, /* uses free format bitrate */
Gruenfrosch 0:7627c79db971 94
Gruenfrosch 0:7627c79db971 95 MAD_FLAG_LSF_EXT = 0x1000, /* lower sampling freq. extension */
Gruenfrosch 0:7627c79db971 96 MAD_FLAG_MC_EXT = 0x2000, /* multichannel audio extension */
Gruenfrosch 0:7627c79db971 97 MAD_FLAG_MPEG_2_5_EXT = 0x4000 /* MPEG 2.5 (unofficial) extension */
Gruenfrosch 0:7627c79db971 98 };
Gruenfrosch 0:7627c79db971 99
Gruenfrosch 0:7627c79db971 100 enum {
Gruenfrosch 0:7627c79db971 101 MAD_PRIVATE_HEADER = 0x0100, /* header private bit */
Gruenfrosch 0:7627c79db971 102 MAD_PRIVATE_III = 0x001f /* Layer III private bits (up to 5) */
Gruenfrosch 0:7627c79db971 103 };
Gruenfrosch 0:7627c79db971 104
Gruenfrosch 0:7627c79db971 105 void mad_header_init(struct mad_header *);
Gruenfrosch 0:7627c79db971 106
Gruenfrosch 0:7627c79db971 107 # define mad_header_finish(header) /* nothing */
Gruenfrosch 0:7627c79db971 108
Gruenfrosch 0:7627c79db971 109 int mad_header_decode(struct mad_header *, struct mad_stream *);
Gruenfrosch 0:7627c79db971 110
Gruenfrosch 0:7627c79db971 111 void mad_frame_init(struct mad_frame *);
Gruenfrosch 0:7627c79db971 112 void mad_frame_finish(struct mad_frame *);
Gruenfrosch 0:7627c79db971 113
Gruenfrosch 0:7627c79db971 114 int mad_frame_decode(struct mad_frame *, struct mad_stream *);
Gruenfrosch 0:7627c79db971 115
Gruenfrosch 0:7627c79db971 116 void mad_frame_mute(struct mad_frame *);
Gruenfrosch 0:7627c79db971 117
Gruenfrosch 0:7627c79db971 118 # endif