Mercurial > SDL_sound_CoreAudio

annotate decoders/smpeg.c @ 541:1f0a57a2483f stable-1.0

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Updated.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 17 Apr 2008 18:16:59 +0000
parents 50bb9a6cebfe
children
rev   line source
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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 * MPEG-1 Layer 3, or simply, "MP3", decoder for SDL_sound.
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22 *
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23 * This driver handles all those highly compressed songs you stole through
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24 * Napster. :) It depends on the SMPEG library for decoding, which can
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25 * be grabbed from: http://www.lokigames.com/development/smpeg.php3
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26 *
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27 * This should also be able to extract the audio stream from an MPEG movie.
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28 *
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29 * There is an alternative MP3 decoder available, called "mpglib", which
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30 * doesn't depend on external libraries (the decoder itself is part of
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31 * SDL_sound), and may be more efficient, but less flexible than SMPEG. YMMV.
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32 *
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33 * Please see the file COPYING in the source's root directory.
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34 *
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35 * This file written by Ryan C. Gordon. (icculus@icculus.org)
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36 */
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37
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38 #if HAVE_CONFIG_H
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39 # include <config.h>
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40 #endif
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41
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42 #ifdef SOUND_SUPPORTS_SMPEG
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43
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44 #include <stdio.h>
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45 #include <stdlib.h>
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46 #include <string.h>
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47
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48 #include "SDL_sound.h"
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49
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50 #define __SDL_SOUND_INTERNAL__
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51 #include "SDL_sound_internal.h"
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52
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53 #include "smpeg.h"
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54 #include "extra_rwops.h"
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55
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56
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57 static int _SMPEG_init(void);
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58 static void _SMPEG_quit(void);
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59 static int _SMPEG_open(Sound_Sample *sample, const char *ext);
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60 static void _SMPEG_close(Sound_Sample *sample);
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61 static Uint32 _SMPEG_read(Sound_Sample *sample);
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62 static int _SMPEG_rewind(Sound_Sample *sample);
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63 static int _SMPEG_seek(Sound_Sample *sample, Uint32 ms);
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64
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65 static const char *extensions_smpeg[] = { "MP3", "MPEG", "MPG", NULL };
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66 const Sound_DecoderFunctions __Sound_DecoderFunctions_SMPEG =
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67 {
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68 {
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69 extensions_smpeg,
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70 "MPEG-1 Layer 3 audio through SMPEG",
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71 "Ryan C. Gordon <icculus@icculus.org>",
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72 "http://icculus.org/smpeg/"
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73 },
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74
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75 _SMPEG_init, /* init() method */
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76 _SMPEG_quit, /* quit() method */
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77 _SMPEG_open, /* open() method */
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78 _SMPEG_close, /* close() method */
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79 _SMPEG_read, /* read() method */
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80 _SMPEG_rewind, /* rewind() method */
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81 _SMPEG_seek /* seek() method */
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82 };
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83
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84
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85 static int _SMPEG_init(void)
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86 {
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87 return(1); /* always succeeds. */
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88 } /* _SMPEG_init */
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89
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90
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91 static void _SMPEG_quit(void)
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92 {
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93 /* it's a no-op. */
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94 } /* _SMPEG_quit */
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95
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96
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97 static __inline__ void output_version(void)
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98 {
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99 static int first_time = 1;
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100
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101 if (first_time)
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102 {
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103 SMPEG_version v;
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104 SMPEG_VERSION(&v);
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105 SNDDBG(("SMPEG: Compiled against SMPEG v%d.%d.%d.\n",
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106 v.major, v.minor, v.patch));
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107 first_time = 0;
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108 } /* if */
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109 } /* output_version */
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110
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111
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112 static int _SMPEG_open(Sound_Sample *sample, const char *ext)
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113 {
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114 SMPEG *smpeg;
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115 SMPEG_Info smpeg_info;
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116 SDL_AudioSpec spec;
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117 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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118 SDL_RWops *refCounter;
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119 const char *err = NULL;
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120
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121 output_version();
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122
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123 /*
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124 * If I understand things correctly, MP3 files don't really have any
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125 * magic header we can check for. The MP3 player is expected to just
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126 * pick the first thing that looks like a valid frame and start
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127 * playing from there.
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128 *
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129 * So here's what we do: If the caller insists that this is really
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130 * MP3 we'll take his word for it. Otherwise, use the same test as
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131 * SDL_mixer does and check if the stream starts with something that
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132 * looks like a frame.
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133 *
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134 * A frame begins with 11 bits of frame sync (all bits must be set),
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135 * followed by a two-bit MPEG Audio version ID:
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136 *
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137 * 00 - MPEG Version 2.5 (later extension of MPEG 2)
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138 * 01 - reserved
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139 * 10 - MPEG Version 2 (ISO/IEC 13818-3)
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140 * 11 - MPEG Version 1 (ISO/IEC 11172-3)
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141 *
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142 * Apparently we don't handle MPEG Version 2.5.
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143 */
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144 if (__Sound_strcasecmp(ext, "MP3") != 0)
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145 {
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146 Uint8 mp3_magic[2];
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147
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148 if (SDL_RWread(internal->rw, mp3_magic, sizeof (mp3_magic), 1) != 1)
358
f11c10ffa31a Fixed some debug messages.
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149 BAIL_MACRO("SMPEG: Could not read MP3 magic.", 0);
260
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150
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151 if (mp3_magic[0] != 0xFF || (mp3_magic[1] & 0xF0) != 0xF0)
358
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152 BAIL_MACRO("SMPEG: Not an MP3 stream.", 0);
260
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153
351
069ce624d6cf FIXME cleanup.
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154 /* If the seek fails, we'll probably miss a frame, but oh well */
260
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155 SDL_RWseek(internal->rw, -sizeof (mp3_magic), SEEK_CUR);
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156 } /* if */
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157
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158 refCounter = RWops_RWRefCounter_new(internal->rw);
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159 if (refCounter == NULL)
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160 {
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161 SNDDBG(("SMPEG: Failed to create reference counting RWops.\n"));
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162 return(0);
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163 } /* if */
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164
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165 /* replace original RWops. This is safe. Honest. :) */
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166 internal->rw = refCounter;
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167
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168 /*
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169 * increment the refcount, since SMPEG will nuke the RWops if it can't
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170 * accept the contained data...
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171 */
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172 RWops_RWRefCounter_addRef(refCounter);
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173 smpeg = SMPEG_new_rwops(refCounter, &smpeg_info, 0);
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174
517
0f5888f9aef7 Fixed bogus memory deference when SMPEG fails init (thanks, Chris!).
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175 err = SMPEG_error(smpeg);
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176 if (err != NULL)
260
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177 {
517
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178 __Sound_SetError(err); /* make a copy before SMPEG_delete()... */
260
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179 SMPEG_delete(smpeg);
517
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180 return(0);
260
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181 } /* if */
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182
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183 if (!smpeg_info.has_audio)
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184 {
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185 SMPEG_delete(smpeg);
387
fb519e6028e3 Changed all the Sound_SetError() calls to __Sound_SetError (or BAIL*_MACRO)
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186 BAIL_MACRO("SMPEG: No audio stream found in data.", 0);
260
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187 } /* if */
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188
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189 SNDDBG(("SMPEG: Accepting data stream.\n"));
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190 SNDDBG(("SMPEG: has_audio == {%s}.\n", smpeg_info.has_audio ? "TRUE" : "FALSE"));
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191 SNDDBG(("SMPEG: has_video == {%s}.\n", smpeg_info.has_video ? "TRUE" : "FALSE"));
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192 SNDDBG(("SMPEG: width == (%d).\n", smpeg_info.width));
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193 SNDDBG(("SMPEG: height == (%d).\n", smpeg_info.height));
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194 SNDDBG(("SMPEG: current_frame == (%d).\n", smpeg_info.current_frame));
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195 SNDDBG(("SMPEG: current_fps == (%f).\n", smpeg_info.current_fps));
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196 SNDDBG(("SMPEG: audio_string == [%s].\n", smpeg_info.audio_string));
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197 SNDDBG(("SMPEG: audio_current_frame == (%d).\n", smpeg_info.audio_current_frame));
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198 SNDDBG(("SMPEG: current_offset == (%d).\n", smpeg_info.current_offset));
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199 SNDDBG(("SMPEG: total_size == (%d).\n", smpeg_info.total_size));
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200 SNDDBG(("SMPEG: current_time == (%f).\n", smpeg_info.current_time));
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201 SNDDBG(("SMPEG: total_time == (%f).\n", smpeg_info.total_time));
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202
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203 SMPEG_enablevideo(smpeg, 0);
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204 SMPEG_enableaudio(smpeg, 1);
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205 SMPEG_loop(smpeg, 0);
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206
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207 SMPEG_wantedSpec(smpeg, &spec);
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208
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209 /*
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210 * One of the MP3s I tried wouldn't work unless I added this line
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211 * to tell SMPEG that yes, it may have the spec it wants.
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212 */
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213 SMPEG_actualSpec(smpeg, &spec);
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214 sample->actual.format = spec.format;
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215 sample->actual.rate = spec.freq;
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216 sample->actual.channels = spec.channels;
326
1b33baef9bf9 Added seek method.
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217 sample->flags = SOUND_SAMPLEFLAG_CANSEEK;
260
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218 internal->decoder_private = smpeg;
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219
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220 SMPEG_play(smpeg);
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221 return(1);
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222 } /* _SMPEG_open */
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223
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224
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225 static void _SMPEG_close(Sound_Sample *sample)
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226 {
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227 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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228 SMPEG_delete((SMPEG *) internal->decoder_private);
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229 } /* _SMPEG_close */
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230
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231
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232 static Uint32 _SMPEG_read(Sound_Sample *sample)
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233 {
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234 Uint32 retval;
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235 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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236 SMPEG *smpeg = (SMPEG *) internal->decoder_private;
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237
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238 /*
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239 * We have to clear the buffer because apparently SMPEG_playAudio()
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240 * will mix the decoded audio with whatever's already in it. Nasty.
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241 */
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242 memset(internal->buffer, '\0', internal->buffer_size);
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243 retval = SMPEG_playAudio(smpeg, internal->buffer, internal->buffer_size);
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244 if (retval < internal->buffer_size)
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245 {
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246 char *errMsg = SMPEG_error(smpeg);
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247 if (errMsg == NULL)
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248 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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249 else
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250 {
387
fb519e6028e3 Changed all the Sound_SetError() calls to __Sound_SetError (or BAIL*_MACRO)
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diff changeset
251 __Sound_SetError(errMsg);
260
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252 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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253 } /* else */
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254 } /* if */
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255
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256 return(retval);
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257 } /* _SMPEG_read */
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258
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259
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260 static int _SMPEG_rewind(Sound_Sample *sample)
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261 {
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262 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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263 SMPEG *smpeg = (SMPEG *) internal->decoder_private;
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264 SMPEGstatus status;
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265
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266 /*
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267 * SMPEG_rewind() really means "stop and rewind", so we may have to
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268 * restart it afterwards.
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269 */
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270 status = SMPEG_status(smpeg);
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271 SMPEG_rewind(smpeg);
436
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272 /* EW: I think SMPEG_play() has an independent and unrelated meaning
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273 * to the flag, "SMPEG_PLAYING". This is why the SMPEG_play() call
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274 * is done in the open() function even though the file is not yet
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275 * technically playing. I believe SMPEG_play() must always be active
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276 * because this seems to be what's causing the:
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277 * "Can't rewind after the file has finished playing once" problem,
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278 * because always recalling it here seems to make the problem go away.
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279 */
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280 /*
260
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281 if (status == SMPEG_PLAYING)
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282 SMPEG_play(smpeg);
436
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283 */
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284 SMPEG_play(smpeg);
260
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285 return(1);
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286 } /* _SMPEG_rewind */
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287
306
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288
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289 static int _SMPEG_seek(Sound_Sample *sample, Uint32 ms)
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290 {
326
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291 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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292 SMPEG *smpeg = (SMPEG *) internal->decoder_private;
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293 SMPEGstatus status;
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294
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295 /*
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296 * SMPEG_rewind() really means "stop and rewind", so we may have to
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297 * restart it afterwards.
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298 */
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299 status = SMPEG_status(smpeg);
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300 SMPEG_rewind(smpeg);
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301 SMPEG_skip(smpeg, ((float) ms) / 1000.0);
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302 if (status == SMPEG_PLAYING)
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303 SMPEG_play(smpeg);
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304 return(1);
306
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305 } /* _SMPEG_seek */
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306
260
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307 #endif /* SOUND_SUPPORTS_SMPEG */
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308
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309 /* end of smpeg.c ... */
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310