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38
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1 /*
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2 * SDL_sound -- An abstract sound format decoding API.
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3 * Copyright (C) 2001 Ryan C. Gordon.
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4 *
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5 * This library is free software; you can redistribute it and/or
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6 * modify it under the terms of the GNU Lesser General Public
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7 * License as published by the Free Software Foundation; either
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8 * version 2.1 of the License, or (at your option) any later version.
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9 *
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10 * This library is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * Lesser General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU Lesser General Public
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16 * License along with this library; if not, write to the Free Software
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17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 */
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19
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20 /*
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21 * libmpg123 decoder for SDL_sound. This is a very lightweight MP3 decoder,
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22 * which is included with the SDL_sound source, so that it doesn't rely on
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23 * unnecessary external libraries.
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24 *
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25 * libmpg123 is part of mpg123, and can be found in its original
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26 * form at: http://www.mpg123.org/
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27 *
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28 * Please see the file LICENSE.txt in the source's root directory. The included
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29 * source code for libmpg123 falls under the LGPL, which is the same license
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30 * as SDL_sound (so you can consider it a single work).
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31 *
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32 * This file written by Ryan C. Gordon. (icculus@icculus.org)
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33 */
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34
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35 #if HAVE_CONFIG_H
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36 # include <config.h>
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37 #endif
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38
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39 #ifdef SOUND_SUPPORTS_MPG123
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40
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41 #include <stdio.h>
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42 #include <stdlib.h>
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43 #include <string.h>
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44 #include <assert.h>
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45
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46 #include "mpg123.h"
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47
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48 #ifdef ALMIXER_COMPILE_WITHOUT_SDL
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49 #include "SoundDecoder.h"
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50 #include "SoundDecoder_Internal.h"
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51 #include "SimpleMutex.h"
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52 #include "ALmixer_RWops.h"
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53 #include <stdint.h>
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54 typedef struct SimpleMutex SDL_mutex;
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55 typedef struct ALmixer_RWops SDL_RWops;
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56 #define SDL_CreateMutex SimpleMutex_CreateMutex
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57 #define SDL_DestroyMutex SimpleMutex_DestroyMutex
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58 #define SDL_LockMutex SimpleMutex_LockMutex
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59 #define SDL_UnlockMutex SimpleMutex_UnlockMutex
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60 typedef uint32_t Uint32;
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61 #define SDL_RWseek ALmixer_RWseek
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62 #define SDL_RWread ALmixer_RWread
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63
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64 #else
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65 #include "SDL_sound.h"
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66
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67 #define __SDL_SOUND_INTERNAL__
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68 #include "SDL_sound_internal.h"
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69 #endif
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70
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71 #ifdef _MSC_VER
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72 #define snprintf _snprintf
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73 #endif
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74
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75
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76 static int MPG123_init(void);
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77 static void MPG123_quit(void);
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78 static int MPG123_open(Sound_Sample *sample, const char *ext);
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79 static void MPG123_close(Sound_Sample *sample);
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80 static Uint32 MPG123_read(Sound_Sample *sample);
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81 static int MPG123_rewind(Sound_Sample *sample);
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82 static int MPG123_seek(Sound_Sample *sample, Uint32 ms);
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83
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84 /* !!! FIXME: MPEG and MPG extensions? */
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85 static const char *extensions_mpg123[] = { "MP3", NULL };
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86 const Sound_DecoderFunctions __Sound_DecoderFunctions_MPG123 =
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87 {
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88 {
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89 extensions_mpg123,
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90 "MP3 decoding via internal libmpg123",
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91 "Ryan C. Gordon <icculus@icculus.org>",
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92 "http://www.icculus.org/SDL_sound/"
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93 },
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94
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95 MPG123_init, /* init() method */
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96 MPG123_quit, /* quit() method */
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97 MPG123_open, /* open() method */
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98 MPG123_close, /* close() method */
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99 MPG123_read, /* read() method */
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100 MPG123_rewind, /* rewind() method */
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101 MPG123_seek /* seek() method */
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102 };
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103
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104
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105 /* this is what we store in our internal->decoder_private field... */
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106 typedef mpg123_handle mpg123_t;
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107
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108 static SDL_mutex *mpg123_mutex = NULL;
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109 static int mpg123_rwops_count = 0;
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110 static SDL_RWops **mpg123_rwops = NULL;
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111
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112 static void print_decoders(const char *kind, char **decoders)
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113 {
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114 SNDDBG(("%s:", kind));
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115 if (*decoders == NULL)
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116 {
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117 SNDDBG((" [none]"));
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118 }
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119 else
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120 {
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121 do
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122 {
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123 SNDDBG((" %s", *decoders));
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124 } while (*(++decoders));
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125 } /* else */
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126 SNDDBG(("\n"));
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127 } /* print_decoders */
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128
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129
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130 static int MPG123_init(void)
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131 {
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132 int retval = 0;
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133 assert(mpg123_mutex == NULL);
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134 if (mpg123_init() == MPG123_OK)
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135 {
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136 char **supported = mpg123_supported_decoders();
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137 print_decoders("ALL MPG123 DECODERS", mpg123_decoders());
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138 print_decoders("SUPPORTED MPG123 DECODERS", mpg123_supported_decoders());
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139 if ((supported != NULL) && (*supported != NULL))
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140 {
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141 mpg123_mutex = SDL_CreateMutex();
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142 if (mpg123_mutex != NULL)
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143 retval = 1; /* at least one decoder available. */
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144 } /* if */
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145 } /* if */
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146
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147 return retval;
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148 } /* MPG123_init */
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149
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150
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151 static void MPG123_quit(void)
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152 {
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153 mpg123_exit();
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154 SDL_DestroyMutex(mpg123_mutex);
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155 mpg123_mutex = NULL;
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156 free(mpg123_rwops);
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157 mpg123_rwops = NULL;
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158 mpg123_rwops_count = 0;
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159 } /* MPG123_quit */
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160
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161
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162 /* bridge rwops reading to libmpg123 hooks. */
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163 static ssize_t rwread(int fd, void *buf, size_t len)
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164 {
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165 SDL_RWops *rw = NULL;
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166 SDL_LockMutex(mpg123_mutex);
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167 rw = mpg123_rwops[fd];
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168 SDL_UnlockMutex(mpg123_mutex);
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169 return (ssize_t) SDL_RWread(rw, buf, 1, len);
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170 } /* rwread */
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171
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172
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173 /* bridge rwops seeking to libmpg123 hooks. */
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174 static off_t rwseek(int fd, off_t pos, int whence)
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175 {
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176 SDL_RWops *rw = NULL;
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177 SDL_LockMutex(mpg123_mutex);
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178 rw = mpg123_rwops[fd];
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179 SDL_UnlockMutex(mpg123_mutex);
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180 return (off_t) SDL_RWseek(rw, pos, whence);
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181 } /* rwseek */
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182
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183
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184 static const char *set_error(mpg123_handle *mp, const int err)
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185 {
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186 char buffer[128];
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187 const char *str = NULL;
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188 if ((err == MPG123_ERR) && (mp != NULL))
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189 str = mpg123_strerror(mp);
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190 else
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191 str = mpg123_plain_strerror(err);
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192
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193 snprintf(buffer, sizeof (buffer), "MPG123: %s", str);
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194 __Sound_SetError(buffer);
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195
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196 return(NULL); /* this is for BAIL_MACRO to not try to reset the string. */
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197 } /* set_error */
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198
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199
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200 /* Make sure we are only given decoded data in a format we can handle. */
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201 static int set_formats(mpg123_handle *mp)
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202 {
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203 int rc = 0;
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204 const long *rates = NULL;
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205 size_t ratecount = 0;
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206 const int channels = MPG123_STEREO | MPG123_MONO;
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207 const int encodings = /* !!! FIXME: SDL 1.3 can do sint32 and float32.
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208 MPG123_ENC_SIGNED_32 | MPG123_ENC_FLOAT_32 | */
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209 MPG123_ENC_SIGNED_8 | MPG123_ENC_UNSIGNED_8 |
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210 MPG123_ENC_SIGNED_16 | MPG123_ENC_UNSIGNED_16;
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211
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212 mpg123_rates(&rates, &ratecount);
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213
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214 rc = mpg123_format_none(mp);
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215 while ((ratecount--) && (rc == MPG123_OK))
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216 rc = mpg123_format(mp, *(rates++), channels, encodings);
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217
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218 return(rc);
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219 } /* set_formats */
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220
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221
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222 static int MPG123_open(Sound_Sample *sample, const char *ext)
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223 {
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224 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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225 mpg123_handle *mp = NULL;
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226 long rate = 0;
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227 int channels = 0;
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228 int fmt = 0;
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229 int rc = 0;
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230 off_t len = 0;
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231 int seekable = 0;
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232 void *ptr = NULL;
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233 int rwops = 0;
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234
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235 /* !!! FIXME: so much tapdance because we need a pointer, not an int. */
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236 SDL_LockMutex(mpg123_mutex);
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237 for (rwops = 0; rwops < mpg123_rwops_count; rwops++)
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238 {
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239 if (mpg123_rwops[rwops] == NULL)
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240 break;
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241 } /* for */
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242 if (rwops < mpg123_rwops_count)
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243 ptr = mpg123_rwops;
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244 else
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245 {
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246 mpg123_rwops_count++;
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247 ptr = realloc(mpg123_rwops, sizeof (SDL_RWops *) * mpg123_rwops_count);
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248 if (ptr != NULL)
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249 mpg123_rwops = (SDL_RWops **) ptr;
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250 } /* else */
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251 if (ptr != NULL)
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252 mpg123_rwops[rwops] = internal->rw;
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253 SDL_UnlockMutex(mpg123_mutex);
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254 BAIL_IF_MACRO(ptr == NULL, ERR_OUT_OF_MEMORY, 0);
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255
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256 if ((mp = mpg123_new(NULL, &rc)) == NULL)
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257 goto mpg123_open_failed;
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258 else if ((rc = set_formats(mp)) != MPG123_OK)
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259 goto mpg123_open_failed;
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260 else if ((rc = mpg123_replace_reader(mp, rwread, rwseek)) != MPG123_OK)
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261 goto mpg123_open_failed;
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262 else if ((rc = mpg123_open_fd(mp, rwops)) != MPG123_OK)
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263 goto mpg123_open_failed;
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264 else if ((rc = mpg123_scan(mp)) != MPG123_OK)
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265 goto mpg123_open_failed; /* !!! FIXME: this may be wrong. */
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266 else if ((rc = mpg123_getformat(mp, &rate, &channels, &fmt)) != MPG123_OK)
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267 goto mpg123_open_failed;
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268
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269 if (mpg123_seek(mp, 0, SEEK_END) >= 0) /* can seek? */
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270 {
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271 len = mpg123_tell(mp);
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272 if ((rc = (int) mpg123_seek(mp, 0, SEEK_SET)) < 0)
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273 goto mpg123_open_failed;
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274 seekable = 1;
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275 } /* if */
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276
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277 internal->decoder_private = mp;
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278 sample->actual.rate = rate;
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279 sample->actual.channels = channels;
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280
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281 rc = MPG123_BAD_OUTFORMAT; /* in case this fails... */
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282 if (fmt == MPG123_ENC_SIGNED_8)
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283 sample->actual.format = AUDIO_S8;
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284 else if (fmt == MPG123_ENC_UNSIGNED_8)
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285 sample->actual.format = AUDIO_U8;
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286 else if (fmt == MPG123_ENC_SIGNED_16)
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287 sample->actual.format = AUDIO_S16SYS;
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288 else if (fmt == MPG123_ENC_UNSIGNED_16)
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289 sample->actual.format = AUDIO_U16SYS;
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290 /* !!! FIXME: SDL 1.3 can do sint32 and float32 ...
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291 else if (fmt == MPG123_ENC_SIGNED_32)
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292 sample->actual.format = AUDIO_S32SYS;
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293 else if (fmt == MPG123_ENC_FLOAT_32)
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294 sample->actual.format = AUDIO_F32SYS;
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295 */
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296 else
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297 goto mpg123_open_failed;
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298
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299 SNDDBG(("MPG123: Accepting data stream.\n"));
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300
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301 sample->flags = SOUND_SAMPLEFLAG_NONE;
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302 internal->total_time = -1;
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303 if (seekable)
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304 {
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305 sample->flags |= SOUND_SAMPLEFLAG_CANSEEK;
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306 internal->total_time = ((len / rate) * 1000) +
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307 (((len % rate) * 1000) / rate);
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308 } /* if */
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309
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310 return(1); /* we'll handle this data. */
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311
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312 mpg123_open_failed:
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313 SDL_LockMutex(mpg123_mutex);
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314 mpg123_rwops[rwops] = NULL;
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315 if (rwops == mpg123_rwops_count)
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316 mpg123_rwops_count--;
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317 SDL_UnlockMutex(mpg123_mutex);
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318 set_error(mp, rc);
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319 mpg123_delete(mp); /* NULL is safe. */
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320 return(0);
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321 } /* MPG123_open */
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322
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323
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324 static void MPG123_close(Sound_Sample *sample)
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325 {
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326 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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327 mpg123_t *mp = ((mpg123_t *) internal->decoder_private);
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328 int i;
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329
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330 SDL_LockMutex(mpg123_mutex);
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331 for (i = 0; i < mpg123_rwops_count; i++)
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332 {
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333 if (mpg123_rwops[i] == internal->rw)
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334 mpg123_rwops[i] = NULL;
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335 } /* for */
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336
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337 for (i = mpg123_rwops_count-1; i >= 0; i--)
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338 {
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339 if (mpg123_rwops[i] != NULL)
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340 break;
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341 } /* for */
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342 mpg123_rwops_count = i + 1;
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343 SDL_UnlockMutex(mpg123_mutex);
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344
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345 mpg123_close(mp); /* don't need this at the moment, but it's safe. */
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346 mpg123_delete(mp);
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347 } /* MPG123_close */
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348
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349
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350 static Uint32 MPG123_read(Sound_Sample *sample)
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351 {
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352 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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353 mpg123_t *mp = ((mpg123_t *) internal->decoder_private);
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354 size_t bw = 0;
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355 const int rc = mpg123_read(mp, (unsigned char *) internal->buffer,
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356 internal->buffer_size, &bw);
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357 if (rc == MPG123_DONE)
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358 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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359 else if (rc != MPG123_OK)
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360 {
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361 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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362 set_error(mp, rc);
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363 } /* else if */
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364
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365 return((Uint32) bw);
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366 } /* MPG123_read */
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367
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368
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369 static int MPG123_rewind(Sound_Sample *sample)
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370 {
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371 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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372 mpg123_t *mp = ((mpg123_t *) internal->decoder_private);
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373 const int rc = (int) mpg123_seek(mp, 0, SEEK_SET);
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374 BAIL_IF_MACRO(rc < 0, set_error(mp, rc), 0);
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375 return(1);
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376 } /* MPG123_rewind */
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377
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378
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379 static int MPG123_seek(Sound_Sample *sample, Uint32 ms)
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380 {
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381 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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382 mpg123_t *mp = ((mpg123_t *) internal->decoder_private);
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383 const float frames_per_ms = ((float) sample->actual.rate) / 1000.0f;
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384 const off_t frame_offset = (off_t) (frames_per_ms * ((float) ms));
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385 const int rc = (int) mpg123_seek(mp, frame_offset , SEEK_SET);
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386 BAIL_IF_MACRO(rc < 0, set_error(mp, rc), 0);
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387 return(1);
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388 } /* MPG123_seek */
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389
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390 #endif /* SOUND_SUPPORTS_MPG123 */
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391
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392 /* end of mpg123.c ... */
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393
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