annotate decoders/mp3.c @ 100:6d9fdec2f708

added config.h, added --enable-debug flag, various other changes to the build system
author fingolfin
date Wed, 03 Oct 2001 12:25:34 +0000
parents 25e515dfa18d
children 103cfcb3c014
rev   line source
14
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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
64
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32 #ifdef SOUND_SUPPORTS_MP3
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33
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34 #define __SDL_SOUND_INTERNAL__
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35 #include "SDL_sound_internal.h"
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36
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37 #include <stdio.h>
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38 #include <stdlib.h>
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39 #include <string.h>
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40 #include <assert.h>
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41
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42 #include "smpeg.h"
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43 #include "SDL_sound.h"
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44 #include "extra_rwops.h"
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45
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46
46
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47 static int MP3_init(void);
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48 static void MP3_quit(void);
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49 static int MP3_open(Sound_Sample *sample, const char *ext);
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50 static void MP3_close(Sound_Sample *sample);
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51 static Uint32 MP3_read(Sound_Sample *sample);
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52
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53 const Sound_DecoderFunctions __Sound_DecoderFunctions_MP3 =
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54 {
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55 {
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56 "MP3",
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57 "MPEG-1 Layer 3 audio through SMPEG",
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58 "Ryan C. Gordon <icculus@clutteredmind.org>",
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59 "http://www.icculus.org/SDL_sound/"
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60 },
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61
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62 MP3_init, /* init() method */
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63 MP3_quit, /* quit() method */
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64 MP3_open, /* open() method */
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65 MP3_close, /* close() method */
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66 MP3_read /* read() method */
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67 };
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69
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70 static int MP3_init(void)
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71 {
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72 return(1); /* always succeeds. */
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73 } /* MP3_init */
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74
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75
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76 static void MP3_quit(void)
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77 {
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78 /* it's a no-op. */
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79 } /* MP3_quit */
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80
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81
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82 static __inline__ void output_version(void)
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83 {
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84 static int first_time = 1;
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85
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86 if (first_time)
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87 {
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88 SMPEG_version v;
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89 SMPEG_VERSION(&v);
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90 SNDDBG(("MP3: Compiled against SMPEG v%d.%d.%d.\n",
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91 v.major, v.minor, v.patch));
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92 first_time = 0;
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93 } /* if */
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94 } /* output_version */
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95
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96
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97 static int MP3_open(Sound_Sample *sample, const char *ext)
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98 {
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99 SMPEG *smpeg;
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100 SMPEG_Info smpeg_info;
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101 SDL_AudioSpec spec;
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102 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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103 SDL_RWops *refCounter;
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104
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105 output_version();
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106
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107 /*
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108 * If I understand things correctly, MP3 files don't really have any
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109 * magic header we can check for. The MP3 player is expected to just
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110 * pick the first thing that looks like a valid frame and start
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111 * playing from there.
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112 *
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113 * So here's what we do: If the caller insists that this is really
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114 * MP3 we'll take his word for it. Otherwise, use the same test as
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115 * SDL_mixer does and check if the stream starts with something that
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116 * looks like a frame.
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117 *
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118 * A frame begins with 11 bits of frame sync (all bits must be set),
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119 * followed by a two-bit MPEG Audio version ID:
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120 *
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121 * 00 - MPEG Version 2.5 (later extension of MPEG 2)
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122 * 01 - reserved
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123 * 10 - MPEG Version 2 (ISO/IEC 13818-3)
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124 * 11 - MPEG Version 1 (ISO/IEC 11172-3)
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125 *
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126 * Apparently we don't handle MPEG Version 2.5.
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127 */
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128 if (__Sound_strcasecmp(ext, "MP3") != 0)
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129 {
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130 Uint8 mp3_magic[2];
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131
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132 if (SDL_RWread(internal->rw, mp3_magic, sizeof (mp3_magic), 1) != 1)
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133 {
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134 Sound_SetError("MP3: Could not read MP3 magic.");
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135 return(0);
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136 } /*if */
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137
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138 if (mp3_magic[0] != 0xFF || (mp3_magic[1] & 0xF0) != 0xF0)
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139 {
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140 Sound_SetError("MP3: Not an MP3 stream.");
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141 return(0);
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142 } /* if */
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143
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144 /* !!! FIXME: If the seek fails, we'll probably miss a frame */
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145 SDL_RWseek(internal->rw, -sizeof (mp3_magic), SEEK_CUR);
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146 } /* if */
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147
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148 refCounter = RWops_RWRefCounter_new(internal->rw);
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149 if (refCounter == NULL)
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150 {
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151 SNDDBG(("MP3: Failed to create reference counting RWops.\n"));
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152 return(0);
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153 } /* if */
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154
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155 /* replace original RWops. This is safe. Honest. :) */
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156 internal->rw = refCounter;
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157
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158 /*
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159 * increment the refcount, since SMPEG will nuke the RWops if it can't
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160 * accept the contained data...
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161 */
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162 RWops_RWRefCounter_addRef(refCounter);
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163 smpeg = SMPEG_new_rwops(refCounter, &smpeg_info, 0);
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164
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165 if (SMPEG_error(smpeg))
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166 {
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167 Sound_SetError(SMPEG_error(smpeg));
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168 SMPEG_delete(smpeg);
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169 return(0);
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170 } /* if */
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171
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172 if (!smpeg_info.has_audio)
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173 {
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174 Sound_SetError("MP3: No audio stream found in data.");
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175 SMPEG_delete(smpeg);
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176 return(0);
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177 } /* if */
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178
62
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179 SNDDBG(("MP3: Accepting data stream.\n"));
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180 SNDDBG(("MP3: has_audio == {%s}.\n", smpeg_info.has_audio ? "TRUE" : "FALSE"));
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181 SNDDBG(("MP3: has_video == {%s}.\n", smpeg_info.has_video ? "TRUE" : "FALSE"));
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182 SNDDBG(("MP3: width == (%d).\n", smpeg_info.width));
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183 SNDDBG(("MP3: height == (%d).\n", smpeg_info.height));
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184 SNDDBG(("MP3: current_frame == (%d).\n", smpeg_info.current_frame));
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185 SNDDBG(("MP3: current_fps == (%f).\n", smpeg_info.current_fps));
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186 SNDDBG(("MP3: audio_string == [%s].\n", smpeg_info.audio_string));
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187 SNDDBG(("MP3: audio_current_frame == (%d).\n", smpeg_info.audio_current_frame));
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188 SNDDBG(("MP3: current_offset == (%d).\n", smpeg_info.current_offset));
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189 SNDDBG(("MP3: total_size == (%d).\n", smpeg_info.total_size));
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190 SNDDBG(("MP3: current_time == (%f).\n", smpeg_info.current_time));
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191 SNDDBG(("MP3: total_time == (%f).\n", smpeg_info.total_time));
14
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192
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193 SMPEG_enablevideo(smpeg, 0);
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194 SMPEG_enableaudio(smpeg, 1);
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195 SMPEG_loop(smpeg, 0);
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196
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197 SMPEG_wantedSpec(smpeg, &spec);
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25e515dfa18d Fix for MP3 detection.
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198
54
6df2f69e037e Fixes by Torbj�rn...now the thing actually works! :) See the CHANGELOG
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199 /*
96
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200 * One of the MP3s I tried wouldn't work unless I added this line
54
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201 * to tell SMPEG that yes, it may have the spec it wants.
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202 */
6df2f69e037e Fixes by Torbj�rn...now the thing actually works! :) See the CHANGELOG
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203 SMPEG_actualSpec(smpeg, &spec);
14
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204 sample->actual.format = spec.format;
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205 sample->actual.rate = spec.freq;
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206 sample->actual.channels = spec.channels;
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207 sample->flags = SOUND_SAMPLEFLAG_NONE;
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208 internal->decoder_private = smpeg;
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209
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210 SMPEG_play(smpeg);
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211 return(1);
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Ryan C. Gordon <icculus@icculus.org>
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212 } /* MP3_open */
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213
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214
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215 static void MP3_close(Sound_Sample *sample)
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216 {
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217 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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218 SMPEG_delete((SMPEG *) internal->decoder_private);
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Ryan C. Gordon <icculus@icculus.org>
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219 } /* MP3_close */
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220
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221
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222 static Uint32 MP3_read(Sound_Sample *sample)
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223 {
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224 Uint32 retval;
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225 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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226 SMPEG *smpeg = (SMPEG *) internal->decoder_private;
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227
54
6df2f69e037e Fixes by Torbj�rn...now the thing actually works! :) See the CHANGELOG
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diff changeset
228 /*
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229 * We have to clear the buffer because apparently SMPEG_playAudio()
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230 * will mix the decoded audio with whatever's already in it. Nasty.
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231 */
6df2f69e037e Fixes by Torbj�rn...now the thing actually works! :) See the CHANGELOG
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232 memset(internal->buffer, 0, internal->buffer_size);
14
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233 retval = SMPEG_playAudio(smpeg, internal->buffer, internal->buffer_size);
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Ryan C. Gordon <icculus@icculus.org>
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234 if (retval < internal->buffer_size)
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Ryan C. Gordon <icculus@icculus.org>
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235 {
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Ryan C. Gordon <icculus@icculus.org>
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236 char *errMsg = SMPEG_error(smpeg);
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Ryan C. Gordon <icculus@icculus.org>
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237 if (errMsg == NULL)
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Ryan C. Gordon <icculus@icculus.org>
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238 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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Ryan C. Gordon <icculus@icculus.org>
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239 else
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Ryan C. Gordon <icculus@icculus.org>
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240 {
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Ryan C. Gordon <icculus@icculus.org>
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241 Sound_SetError(errMsg);
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Ryan C. Gordon <icculus@icculus.org>
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242 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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Ryan C. Gordon <icculus@icculus.org>
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243 } /* else */
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Ryan C. Gordon <icculus@icculus.org>
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244 } /* if */
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245
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246 return(retval);
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Ryan C. Gordon <icculus@icculus.org>
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247 } /* MP3_read */
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248
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40006625142a Changes in preparation of autoconf support.
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249 #endif /* SOUND_SUPPORTS_MP3 */
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250
14
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251 /* end of mp3.c ... */
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Ryan C. Gordon <icculus@icculus.org>
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252