annotate decoders/mp3.c @ 140:c28566f219e2 release-0.1.3

Updated.
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 15 Oct 2001 18:26:27 +0000
parents 40de367eb59e
children 1df5c106504e
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 * Please see the file LICENSE in the source's root directory.
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28 *
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29 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org)
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30 */
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31
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32 #if HAVE_CONFIG_H
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33 # include <config.h>
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34 #endif
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35
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36 #ifdef SOUND_SUPPORTS_MP3
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37
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38 #include <stdio.h>
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39 #include <stdlib.h>
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40 #include <string.h>
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41 #include <assert.h>
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42
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43 #include "SDL_sound.h"
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44
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45 #define __SDL_SOUND_INTERNAL__
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46 #include "SDL_sound_internal.h"
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47
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48 #include "smpeg.h"
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49 #include "extra_rwops.h"
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50
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51
46
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52 static int MP3_init(void);
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53 static void MP3_quit(void);
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54 static int MP3_open(Sound_Sample *sample, const char *ext);
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55 static void MP3_close(Sound_Sample *sample);
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56 static Uint32 MP3_read(Sound_Sample *sample);
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57
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58 const Sound_DecoderFunctions __Sound_DecoderFunctions_MP3 =
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59 {
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60 {
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61 "MP3",
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62 "MPEG-1 Layer 3 audio through SMPEG",
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63 "Ryan C. Gordon <icculus@clutteredmind.org>",
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64 "http://www.icculus.org/SDL_sound/"
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65 },
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66
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67 MP3_init, /* init() method */
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68 MP3_quit, /* quit() method */
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69 MP3_open, /* open() method */
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70 MP3_close, /* close() method */
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71 MP3_read /* read() method */
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72 };
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74
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75 static int MP3_init(void)
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76 {
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77 return(1); /* always succeeds. */
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78 } /* MP3_init */
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79
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80
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81 static void MP3_quit(void)
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82 {
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83 /* it's a no-op. */
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84 } /* MP3_quit */
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85
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86
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87 static __inline__ void output_version(void)
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88 {
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89 static int first_time = 1;
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90
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91 if (first_time)
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92 {
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93 SMPEG_version v;
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94 SMPEG_VERSION(&v);
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95 SNDDBG(("MP3: Compiled against SMPEG v%d.%d.%d.\n",
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96 v.major, v.minor, v.patch));
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97 first_time = 0;
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98 } /* if */
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99 } /* output_version */
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100
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101
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102 static int MP3_open(Sound_Sample *sample, const char *ext)
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103 {
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104 SMPEG *smpeg;
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105 SMPEG_Info smpeg_info;
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106 SDL_AudioSpec spec;
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107 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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108 SDL_RWops *refCounter;
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109
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110 output_version();
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111
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112 /*
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113 * If I understand things correctly, MP3 files don't really have any
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114 * magic header we can check for. The MP3 player is expected to just
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115 * pick the first thing that looks like a valid frame and start
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116 * playing from there.
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117 *
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118 * So here's what we do: If the caller insists that this is really
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119 * MP3 we'll take his word for it. Otherwise, use the same test as
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120 * SDL_mixer does and check if the stream starts with something that
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121 * looks like a frame.
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122 *
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123 * A frame begins with 11 bits of frame sync (all bits must be set),
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124 * followed by a two-bit MPEG Audio version ID:
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125 *
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126 * 00 - MPEG Version 2.5 (later extension of MPEG 2)
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127 * 01 - reserved
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128 * 10 - MPEG Version 2 (ISO/IEC 13818-3)
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129 * 11 - MPEG Version 1 (ISO/IEC 11172-3)
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130 *
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131 * Apparently we don't handle MPEG Version 2.5.
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132 */
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133 if (__Sound_strcasecmp(ext, "MP3") != 0)
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134 {
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135 Uint8 mp3_magic[2];
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136
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137 if (SDL_RWread(internal->rw, mp3_magic, sizeof (mp3_magic), 1) != 1)
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138 {
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139 Sound_SetError("MP3: Could not read MP3 magic.");
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140 return(0);
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141 } /*if */
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142
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143 if (mp3_magic[0] != 0xFF || (mp3_magic[1] & 0xF0) != 0xF0)
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144 {
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145 Sound_SetError("MP3: Not an MP3 stream.");
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146 return(0);
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147 } /* if */
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148
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149 /* !!! FIXME: If the seek fails, we'll probably miss a frame */
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150 SDL_RWseek(internal->rw, -sizeof (mp3_magic), SEEK_CUR);
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151 } /* if */
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152
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153 refCounter = RWops_RWRefCounter_new(internal->rw);
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154 if (refCounter == NULL)
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155 {
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156 SNDDBG(("MP3: Failed to create reference counting RWops.\n"));
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157 return(0);
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158 } /* if */
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159
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160 /* replace original RWops. This is safe. Honest. :) */
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diff changeset
161 internal->rw = refCounter;
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Ryan C. Gordon <icculus@icculus.org>
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162
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Ryan C. Gordon <icculus@icculus.org>
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163 /*
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parents:
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164 * increment the refcount, since SMPEG will nuke the RWops if it can't
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165 * accept the contained data...
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166 */
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Ryan C. Gordon <icculus@icculus.org>
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167 RWops_RWRefCounter_addRef(refCounter);
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168 smpeg = SMPEG_new_rwops(refCounter, &smpeg_info, 0);
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169
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170 if (SMPEG_error(smpeg))
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171 {
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Ryan C. Gordon <icculus@icculus.org>
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172 Sound_SetError(SMPEG_error(smpeg));
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173 SMPEG_delete(smpeg);
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Ryan C. Gordon <icculus@icculus.org>
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174 return(0);
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Ryan C. Gordon <icculus@icculus.org>
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175 } /* if */
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176
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Ryan C. Gordon <icculus@icculus.org>
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177 if (!smpeg_info.has_audio)
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Ryan C. Gordon <icculus@icculus.org>
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178 {
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179 Sound_SetError("MP3: No audio stream found in data.");
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180 SMPEG_delete(smpeg);
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181 return(0);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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182 } /* if */
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183
62
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184 SNDDBG(("MP3: Accepting data stream.\n"));
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185 SNDDBG(("MP3: has_audio == {%s}.\n", smpeg_info.has_audio ? "TRUE" : "FALSE"));
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186 SNDDBG(("MP3: has_video == {%s}.\n", smpeg_info.has_video ? "TRUE" : "FALSE"));
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187 SNDDBG(("MP3: width == (%d).\n", smpeg_info.width));
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188 SNDDBG(("MP3: height == (%d).\n", smpeg_info.height));
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189 SNDDBG(("MP3: current_frame == (%d).\n", smpeg_info.current_frame));
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190 SNDDBG(("MP3: current_fps == (%f).\n", smpeg_info.current_fps));
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191 SNDDBG(("MP3: audio_string == [%s].\n", smpeg_info.audio_string));
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192 SNDDBG(("MP3: audio_current_frame == (%d).\n", smpeg_info.audio_current_frame));
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193 SNDDBG(("MP3: current_offset == (%d).\n", smpeg_info.current_offset));
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194 SNDDBG(("MP3: total_size == (%d).\n", smpeg_info.total_size));
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195 SNDDBG(("MP3: current_time == (%f).\n", smpeg_info.current_time));
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196 SNDDBG(("MP3: total_time == (%f).\n", smpeg_info.total_time));
14
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197
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Ryan C. Gordon <icculus@icculus.org>
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198 SMPEG_enablevideo(smpeg, 0);
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Ryan C. Gordon <icculus@icculus.org>
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199 SMPEG_enableaudio(smpeg, 1);
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Ryan C. Gordon <icculus@icculus.org>
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200 SMPEG_loop(smpeg, 0);
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Ryan C. Gordon <icculus@icculus.org>
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201
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202 SMPEG_wantedSpec(smpeg, &spec);
96
25e515dfa18d Fix for MP3 detection.
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diff changeset
203
54
6df2f69e037e Fixes by Torbj�rn...now the thing actually works! :) See the CHANGELOG
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204 /*
96
25e515dfa18d Fix for MP3 detection.
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205 * One of the MP3s I tried wouldn't work unless I added this line
54
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parents: 46
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206 * to tell SMPEG that yes, it may have the spec it wants.
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207 */
6df2f69e037e Fixes by Torbj�rn...now the thing actually works! :) See the CHANGELOG
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208 SMPEG_actualSpec(smpeg, &spec);
14
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209 sample->actual.format = spec.format;
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210 sample->actual.rate = spec.freq;
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Ryan C. Gordon <icculus@icculus.org>
parents:
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211 sample->actual.channels = spec.channels;
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212 sample->flags = SOUND_SAMPLEFLAG_NONE;
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213 internal->decoder_private = smpeg;
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214
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215 SMPEG_play(smpeg);
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216 return(1);
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Ryan C. Gordon <icculus@icculus.org>
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217 } /* MP3_open */
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218
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219
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220 static void MP3_close(Sound_Sample *sample)
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parents:
diff changeset
221 {
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Ryan C. Gordon <icculus@icculus.org>
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222 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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223 SMPEG_delete((SMPEG *) internal->decoder_private);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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224 } /* MP3_close */
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parents:
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225
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diff changeset
226
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Ryan C. Gordon <icculus@icculus.org>
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227 static Uint32 MP3_read(Sound_Sample *sample)
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diff changeset
228 {
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parents:
diff changeset
229 Uint32 retval;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
230 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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parents:
diff changeset
231 SMPEG *smpeg = (SMPEG *) internal->decoder_private;
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diff changeset
232
54
6df2f69e037e Fixes by Torbj�rn...now the thing actually works! :) See the CHANGELOG
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parents: 46
diff changeset
233 /*
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diff changeset
234 * We have to clear the buffer because apparently SMPEG_playAudio()
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parents: 46
diff changeset
235 * will mix the decoded audio with whatever's already in it. Nasty.
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Ryan C. Gordon <icculus@icculus.org>
parents: 46
diff changeset
236 */
6df2f69e037e Fixes by Torbj�rn...now the thing actually works! :) See the CHANGELOG
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
237 memset(internal->buffer, 0, internal->buffer_size);
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
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238 retval = SMPEG_playAudio(smpeg, internal->buffer, internal->buffer_size);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
239 if (retval < internal->buffer_size)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
240 {
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
241 char *errMsg = SMPEG_error(smpeg);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
242 if (errMsg == NULL)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
243 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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Ryan C. Gordon <icculus@icculus.org>
parents:
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244 else
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
245 {
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
246 Sound_SetError(errMsg);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
247 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
248 } /* else */
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Ryan C. Gordon <icculus@icculus.org>
parents:
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249 } /* if */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
250
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parents:
diff changeset
251 return(retval);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
252 } /* MP3_read */
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253
64
40006625142a Changes in preparation of autoconf support.
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diff changeset
254 #endif /* SOUND_SUPPORTS_MP3 */
40006625142a Changes in preparation of autoconf support.
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diff changeset
255
14
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
256 /* end of mp3.c ... */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
257