Mercurial > SDL_sound_CoreAudio
annotate decoders/mpglib.c @ 306:c97be6e1bd27
Added framework for Sound_Seek() support.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sun, 21 Apr 2002 18:39:47 +0000 |
| parents | ee6e1f8bfae9 |
| children | 31cc49d7d0ce |
| rev | line source |
|---|---|
| 261 | 1 /* |
| 2 * SDL_sound -- An abstract sound format decoding API. | |
| 3 * Copyright (C) 2001 Ryan C. Gordon. | |
| 4 * | |
| 5 * This library is free software; you can redistribute it and/or | |
| 6 * modify it under the terms of the GNU Lesser General Public | |
| 7 * License as published by the Free Software Foundation; either | |
| 8 * version 2.1 of the License, or (at your option) any later version. | |
| 9 * | |
| 10 * This library is distributed in the hope that it will be useful, | |
| 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 * Lesser General Public License for more details. | |
| 14 * | |
| 15 * You should have received a copy of the GNU Lesser General Public | |
| 16 * License along with this library; if not, write to the Free Software | |
| 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 */ | |
| 19 | |
| 20 /* | |
| 21 * MPGLIB decoder for SDL_sound. This is a very lightweight MP3 decoder, | |
| 22 * which is included with the SDL_sound source, so that it doesn't rely on | |
| 23 * unnecessary external libraries. | |
| 24 * | |
| 25 * The SMPEG decoder plays back more forms of MPEGs, and may behave better or | |
| 26 * worse under various conditions. mpglib is (apparently) more efficient than | |
| 27 * SMPEG, and, again, doesn't need an external library. You should test both | |
| 28 * decoders and use what you find works best for you. | |
| 29 * | |
|
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30 * mpglib is an LGPL'd portion of mpg123, which can be found in its original |
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31 * form at: http://www.mpg123.de/ |
| 261 | 32 * |
| 33 * Please see the file COPYING in the source's root directory. The included | |
| 34 * source code for mpglib falls under the LGPL, which is the same license as | |
| 35 * SDL_sound (so you can consider it a single work). | |
| 36 * | |
| 37 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
| 38 */ | |
| 39 | |
| 40 #if HAVE_CONFIG_H | |
| 41 # include <config.h> | |
| 42 #endif | |
| 43 | |
| 44 #ifdef SOUND_SUPPORTS_MPGLIB | |
| 45 | |
| 46 #include <stdio.h> | |
| 47 #include <stdlib.h> | |
| 48 #include <string.h> | |
| 49 #include <assert.h> | |
| 50 #include "mpglib/mpg123_sdlsound.h" | |
| 51 #include "mpglib/mpglib_sdlsound.h" | |
| 52 | |
| 53 #include "SDL_sound.h" | |
| 54 | |
| 55 #define __SDL_SOUND_INTERNAL__ | |
| 56 #include "SDL_sound_internal.h" | |
| 57 | |
| 58 static int MPGLIB_init(void); | |
| 59 static void MPGLIB_quit(void); | |
| 60 static int MPGLIB_open(Sound_Sample *sample, const char *ext); | |
| 61 static void MPGLIB_close(Sound_Sample *sample); | |
| 62 static Uint32 MPGLIB_read(Sound_Sample *sample); | |
| 63 static int MPGLIB_rewind(Sound_Sample *sample); | |
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64 static int MPGLIB_seek(Sound_Sample *sample, Uint32 ms); |
| 261 | 65 |
| 66 static const char *extensions_mpglib[] = { "MP3", NULL }; | |
| 67 const Sound_DecoderFunctions __Sound_DecoderFunctions_MPGLIB = | |
| 68 { | |
| 69 { | |
| 70 extensions_mpglib, | |
| 71 "MP3 decoding via internal mpglib", | |
| 72 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 73 "http://www.icculus.org/SDL_sound/" | |
| 74 }, | |
| 75 | |
| 76 MPGLIB_init, /* init() method */ | |
| 77 MPGLIB_quit, /* quit() method */ | |
| 78 MPGLIB_open, /* open() method */ | |
| 79 MPGLIB_close, /* close() method */ | |
| 80 MPGLIB_read, /* read() method */ | |
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81 MPGLIB_rewind, /* rewind() method */ |
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82 MPGLIB_seek /* seek() method */ |
| 261 | 83 }; |
| 84 | |
| 85 | |
| 86 /* this is what we store in our internal->decoder_private field... */ | |
| 87 typedef struct | |
| 88 { | |
| 89 struct mpstr mp; | |
| 90 Uint8 inbuf[16384]; | |
| 91 Uint8 outbuf[8192]; | |
| 92 int outleft; | |
| 93 int outpos; | |
| 94 } mpglib_t; | |
| 95 | |
| 96 | |
| 97 | |
| 98 static int MPGLIB_init(void) | |
| 99 { | |
| 100 return(1); /* always succeeds. */ | |
| 101 } /* MPGLIB_init */ | |
| 102 | |
| 103 | |
| 104 static void MPGLIB_quit(void) | |
| 105 { | |
| 106 /* it's a no-op. */ | |
| 107 } /* MPGLIB_quit */ | |
| 108 | |
| 109 | |
| 110 static int MPGLIB_open(Sound_Sample *sample, const char *ext) | |
| 111 { | |
| 112 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 113 mpglib_t *mpg = NULL; | |
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114 int rc; |
| 261 | 115 |
| 116 /* | |
| 117 * If I understand things correctly, MP3 files don't really have any | |
| 118 * magic header we can check for. The MP3 player is expected to just | |
| 119 * pick the first thing that looks like a valid frame and start | |
| 120 * playing from there. | |
| 121 * | |
| 122 * So here's what we do: If the caller insists that this is really | |
| 123 * MP3 we'll take his word for it. Otherwise, use the same test as | |
| 124 * SDL_mixer does and check if the stream starts with something that | |
| 125 * looks like a frame. | |
| 126 * | |
| 127 * A frame begins with 11 bits of frame sync (all bits must be set), | |
| 128 * followed by a two-bit MPEG Audio version ID: | |
| 129 * | |
| 130 * 00 - MPEG Version 2.5 (later extension of MPEG 2) | |
| 131 * 01 - reserved | |
| 132 * 10 - MPEG Version 2 (ISO/IEC 13818-3) | |
| 133 * 11 - MPEG Version 1 (ISO/IEC 11172-3) | |
| 134 * | |
| 135 * Apparently we don't handle MPEG Version 2.5. | |
| 136 */ | |
| 137 if (__Sound_strcasecmp(ext, "MP3") != 0) | |
| 138 { | |
| 139 Uint8 mp3_magic[2]; | |
| 140 | |
| 141 if (SDL_RWread(internal->rw, mp3_magic, sizeof (mp3_magic), 1) != 1) | |
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142 BAIL_MACRO("MP3: Could not read MP3 magic.", 0); |
| 261 | 143 |
| 144 if (mp3_magic[0] != 0xFF || (mp3_magic[1] & 0xF0) != 0xF0) | |
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145 BAIL_MACRO("MP3: Not an MP3 stream.", 0); |
| 261 | 146 |
| 147 /* !!! FIXME: If the seek fails, we'll probably miss a frame */ | |
| 148 SDL_RWseek(internal->rw, -sizeof (mp3_magic), SEEK_CUR); | |
| 149 } /* if */ | |
| 150 | |
| 151 mpg = (mpglib_t *) malloc(sizeof (mpglib_t)); | |
| 152 BAIL_IF_MACRO(mpg == NULL, ERR_OUT_OF_MEMORY, 0); | |
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153 memset(mpg, '\0', sizeof (mpglib_t)); |
| 261 | 154 InitMP3(&mpg->mp); |
| 155 | |
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156 rc = SDL_RWread(internal->rw, mpg->inbuf, 1, sizeof (mpg->inbuf)); |
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157 if (rc <= 0) |
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158 { |
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159 free(mpg); |
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160 BAIL_MACRO("MPGLIB: Failed to read any data at all", 0); |
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161 } /* if */ |
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162 |
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163 if (decodeMP3(&mpg->mp, mpg->inbuf, rc, |
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164 mpg->outbuf, sizeof (mpg->outbuf), |
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165 &mpg->outleft) == MP3_ERR) |
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166 { |
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167 free(mpg); |
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168 BAIL_MACRO("MPGLIB: Not an MP3 stream?", 0); |
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169 } /* if */ |
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170 |
| 261 | 171 SNDDBG(("MPGLIB: Accepting data stream.\n")); |
| 172 | |
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173 /* !!! FIXME: Determine what format mpglib is spitting out... */ |
| 261 | 174 internal->decoder_private = mpg; |
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175 sample->actual.rate = mpglib_freqs[mpg->mp.fr.sampling_frequency]; |
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176 sample->actual.channels = mpg->mp.fr.stereo; |
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177 sample->actual.format = AUDIO_S16LSB; /* !!! FIXME: Is this right? */ |
| 261 | 178 sample->flags = SOUND_SAMPLEFLAG_NONE; |
| 179 | |
| 180 return(1); /* we'll handle this data. */ | |
| 181 } /* MPGLIB_open */ | |
| 182 | |
| 183 | |
| 184 static void MPGLIB_close(Sound_Sample *sample) | |
| 185 { | |
| 186 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 187 mpglib_t *mpg = ((mpglib_t *) internal->decoder_private); | |
| 188 ExitMP3(&mpg->mp); | |
| 189 free(mpg); | |
| 190 } /* MPGLIB_close */ | |
| 191 | |
| 192 | |
| 193 static Uint32 MPGLIB_read(Sound_Sample *sample) | |
| 194 { | |
| 195 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 196 mpglib_t *mpg = ((mpglib_t *) internal->decoder_private); | |
| 197 Uint32 bw = 0; | |
| 198 int rc; | |
| 199 | |
| 200 while (bw < internal->buffer_size) | |
| 201 { | |
| 202 if (mpg->outleft > 0) | |
| 203 { | |
| 204 Uint16 cpysize = internal->buffer_size - bw; | |
| 205 if (cpysize > mpg->outleft) | |
| 206 cpysize = mpg->outleft; | |
| 207 memcpy(((Uint8 *) internal->buffer) + bw, | |
| 208 mpg->outbuf + mpg->outpos, cpysize); | |
| 209 bw += cpysize; | |
| 210 mpg->outpos += cpysize; | |
| 211 mpg->outleft -= cpysize; | |
| 212 continue; | |
| 213 } /* if */ | |
| 214 | |
| 215 /* need to decode more from the MP3 stream... */ | |
| 216 mpg->outpos = 0; | |
| 217 rc = decodeMP3(&mpg->mp, NULL, 0, mpg->outbuf, | |
| 218 sizeof (mpg->outbuf), &mpg->outleft); | |
| 219 if (rc == MP3_ERR) | |
| 220 { | |
| 221 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 222 return(bw); | |
| 223 } /* if */ | |
| 224 | |
| 225 else if (rc == MP3_NEED_MORE) | |
| 226 { | |
| 227 rc = SDL_RWread(internal->rw, mpg->inbuf, 1, sizeof (mpg->inbuf)); | |
| 228 if (rc == -1) | |
| 229 { | |
| 230 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 231 return(bw); | |
| 232 } /* if */ | |
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233 |
| 261 | 234 else if (rc == 0) |
| 235 { | |
| 236 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 237 return(bw); | |
| 238 } /* else if */ | |
| 239 | |
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240 /* make sure there isn't an ID3 tag. */ |
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241 /* |
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242 * !!! FIXME: This can fail under the following circumstances: |
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243 * First, if there's the sequence "TAG" 128 bytes from the end |
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244 * of a read that isn't the EOF. This is unlikely. |
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245 * Second, if the TAG sequence is split between two reads (ie, |
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246 * the last byte of a read is 'T', and the next read is the |
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247 * final 127 bytes of the stream, being the rest of the ID3 tag). |
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248 * While this is more likely, it's still not very likely at all. |
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249 * Still, something SHOULD be done about this. |
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250 * ID3v2 tags are more complex, too, not to mention LYRICS tags, |
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251 * etc, which aren't handled, either. Hey, this IS meant to be |
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252 * a lightweight decoder. Use SMPEG if you need an all-purpose |
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253 * decoder. mpglib really assumes you control all your assets. |
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254 */ |
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255 if (rc >= 128) |
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256 { |
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257 Uint8 *ptr = &mpg->inbuf[rc - 128]; |
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258 if ((ptr[0] == 'T') && (ptr[1] == 'A') && (ptr[2] == 'G')) |
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259 rc -= 128; /* disregard it. */ |
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260 } /* if */ |
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261 |
| 263 | 262 rc = decodeMP3(&mpg->mp, mpg->inbuf, rc, |
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263 mpg->outbuf, sizeof (mpg->outbuf), |
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264 &mpg->outleft); |
| 261 | 265 if (rc == MP3_ERR) |
| 266 { | |
| 267 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 268 return(bw); | |
| 269 } /* if */ | |
| 270 } /* else if */ | |
| 271 } /* while */ | |
| 272 | |
| 273 return(bw); | |
| 274 } /* MPGLIB_read */ | |
| 275 | |
| 276 | |
| 277 static int MPGLIB_rewind(Sound_Sample *sample) | |
| 278 { | |
| 279 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 280 mpglib_t *mpg = ((mpglib_t *) internal->decoder_private); | |
| 281 BAIL_IF_MACRO(SDL_RWseek(internal->rw, 0, SEEK_SET) != 0, ERR_IO_ERROR, 0); | |
| 282 | |
| 283 /* this is just resetting some fields in a structure; it's very fast. */ | |
| 284 ExitMP3(&mpg->mp); | |
| 285 InitMP3(&mpg->mp); | |
| 286 mpg->outpos = mpg->outleft = 0; | |
| 287 return(1); | |
| 288 } /* MPGLIB_rewind */ | |
| 289 | |
| 290 | |
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291 static int MPGLIB_seek(Sound_Sample *sample, Uint32 ms) |
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292 { |
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293 BAIL_MACRO("!!! FIXME: Not implemented", 0); |
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294 } /* MPGLIB_seek */ |
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295 |
| 261 | 296 #endif /* SOUND_SUPPORTS_MPGLIB */ |
| 297 | |
| 298 | |
| 299 /* end of mpglib.c ... */ | |
| 300 |