Mercurial > SDL_sound_CoreAudio
annotate decoders/mpglib/interface.c @ 279:52b9f37998db
Removed global state variable; should be thread safe now.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 14 Mar 2002 16:38:59 +0000 |
| parents | 9e7f9e09ea0e |
| children | ad4c8f34136a |
| rev | line source |
|---|---|
| 261 | 1 |
| 2 #include <stdlib.h> | |
| 3 #include <stdio.h> | |
| 4 | |
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5 #include "SDL_sound.h" |
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6 |
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7 #define __SDL_SOUND_INTERNAL__ |
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8 #include "SDL_sound_internal.h" |
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9 |
| 261 | 10 #include "mpg123_sdlsound.h" |
| 11 #include "mpglib_sdlsound.h" | |
| 12 | |
| 13 /* Global mp .. it's a hack */ | |
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14 /*struct mpstr *gmp;*/ |
| 261 | 15 |
| 16 | |
| 17 BOOL InitMP3(struct mpstr *mp) | |
| 18 { | |
| 19 static int init = 0; | |
| 20 | |
| 21 memset(mp,0,sizeof(struct mpstr)); | |
| 22 | |
| 23 mp->framesize = 0; | |
| 24 mp->fsizeold = -1; | |
| 25 mp->bsize = 0; | |
| 26 mp->head = mp->tail = NULL; | |
| 27 mp->fr.single = -1; | |
| 28 mp->bsnum = 0; | |
| 29 mp->synth_bo = 1; | |
| 30 | |
| 31 if(!init) { | |
| 32 init = 1; | |
| 33 make_decode_tables(32767); | |
| 34 init_layer2(); | |
| 35 init_layer3(SBLIMIT); | |
| 36 } | |
| 37 | |
| 38 return !0; | |
| 39 } | |
| 40 | |
| 41 void ExitMP3(struct mpstr *mp) | |
| 42 { | |
| 43 struct buf *b,*bn; | |
| 44 | |
| 45 b = mp->tail; | |
| 46 while(b) { | |
| 47 free(b->pnt); | |
| 48 bn = b->next; | |
| 49 free(b); | |
| 50 b = bn; | |
| 51 } | |
| 52 } | |
| 53 | |
| 54 static struct buf *addbuf(struct mpstr *mp,char *buf,int size) | |
| 55 { | |
| 56 struct buf *nbuf; | |
| 57 | |
| 58 nbuf = malloc( sizeof(struct buf) ); | |
| 59 if(!nbuf) { | |
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60 Sound_SetError("MPGLIB: Out of memory!"); |
| 261 | 61 return NULL; |
| 62 } | |
| 63 nbuf->pnt = malloc(size); | |
| 64 if(!nbuf->pnt) { | |
| 65 free(nbuf); | |
| 66 return NULL; | |
| 67 } | |
| 68 nbuf->size = size; | |
| 69 memcpy(nbuf->pnt,buf,size); | |
| 70 nbuf->next = NULL; | |
| 71 nbuf->prev = mp->head; | |
| 72 nbuf->pos = 0; | |
| 73 | |
| 74 if(!mp->tail) { | |
| 75 mp->tail = nbuf; | |
| 76 } | |
| 77 else { | |
| 78 mp->head->next = nbuf; | |
| 79 } | |
| 80 | |
| 81 mp->head = nbuf; | |
| 82 mp->bsize += size; | |
| 83 | |
| 84 return nbuf; | |
| 85 } | |
| 86 | |
| 87 static void remove_buf(struct mpstr *mp) | |
| 88 { | |
| 89 struct buf *buf = mp->tail; | |
| 90 | |
| 91 mp->tail = buf->next; | |
| 92 if(mp->tail) | |
| 93 mp->tail->prev = NULL; | |
| 94 else { | |
| 95 mp->tail = mp->head = NULL; | |
| 96 } | |
| 97 | |
| 98 free(buf->pnt); | |
| 99 free(buf); | |
| 100 | |
| 101 } | |
| 102 | |
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103 static int read_buf_byte(struct mpstr *mp, unsigned long *retval) |
| 261 | 104 { |
| 105 int pos; | |
| 106 | |
| 107 pos = mp->tail->pos; | |
| 108 while(pos >= mp->tail->size) { | |
| 109 remove_buf(mp); | |
| 110 pos = mp->tail->pos; | |
| 111 if(!mp->tail) { | |
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112 Sound_SetError("MPGLIB: Fatal error! Short read in read_buf_byte()!"); |
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113 return 0; |
| 261 | 114 } |
| 115 } | |
| 116 | |
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117 if (retval != NULL) |
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118 *retval = mp->tail->pnt[pos]; |
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119 |
| 261 | 120 mp->bsize--; |
| 121 mp->tail->pos++; | |
| 122 | |
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123 return 1; |
| 261 | 124 } |
| 125 | |
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126 static int read_head(struct mpstr *mp) |
| 261 | 127 { |
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128 unsigned long val; |
| 261 | 129 unsigned long head; |
| 130 | |
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131 if (!read_buf_byte(mp, &val)) |
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132 return 0; |
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133 |
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134 head = val << 8; |
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135 |
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136 if (!read_buf_byte(mp, &val)) |
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137 return 0; |
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138 |
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139 head |= val; |
| 261 | 140 head <<= 8; |
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141 |
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142 if (!read_buf_byte(mp, &val)) |
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143 return 0; |
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144 |
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145 head |= val; |
| 261 | 146 head <<= 8; |
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147 |
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148 if (!read_buf_byte(mp, &val)) |
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149 return 0; |
| 261 | 150 |
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151 head |= val; |
| 261 | 152 mp->header = head; |
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153 return 1; |
| 261 | 154 } |
| 155 | |
| 156 int decodeMP3(struct mpstr *mp,char *in,int isize,char *out, | |
| 157 int osize,int *done) | |
| 158 { | |
| 159 int len; | |
| 160 | |
| 161 if(osize < 4608) { | |
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162 Sound_SetError("MPGLIB: Not enough output space for decoding!"); |
| 261 | 163 return MP3_ERR; |
| 164 } | |
| 165 | |
| 166 if(in) { | |
| 167 if(addbuf(mp,in,isize) == NULL) { | |
| 168 return MP3_ERR; | |
| 169 } | |
| 170 } | |
| 171 | |
| 172 /* First decode header */ | |
| 173 if(mp->framesize == 0) { | |
| 174 if(mp->bsize < 4) { | |
| 175 return MP3_NEED_MORE; | |
| 176 } | |
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177 |
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178 if (!read_head(mp)) |
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179 return MP3_ERR; |
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180 |
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181 if (!decode_header(&mp->fr,mp->header)) |
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182 return MP3_ERR; |
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183 |
| 261 | 184 mp->framesize = mp->fr.framesize; |
| 185 } | |
| 186 | |
| 187 if(mp->fr.framesize > mp->bsize) | |
| 188 return MP3_NEED_MORE; | |
| 189 | |
| 190 wordpointer = mp->bsspace[mp->bsnum] + 512; | |
| 191 mp->bsnum = (mp->bsnum + 1) & 0x1; | |
| 192 bitindex = 0; | |
| 193 | |
| 194 len = 0; | |
| 195 while(len < mp->framesize) { | |
| 196 int nlen; | |
| 197 int blen = mp->tail->size - mp->tail->pos; | |
| 198 if( (mp->framesize - len) <= blen) { | |
| 199 nlen = mp->framesize-len; | |
| 200 } | |
| 201 else { | |
| 202 nlen = blen; | |
| 203 } | |
| 204 memcpy(wordpointer+len,mp->tail->pnt+mp->tail->pos,nlen); | |
| 205 len += nlen; | |
| 206 mp->tail->pos += nlen; | |
| 207 mp->bsize -= nlen; | |
| 208 if(mp->tail->pos == mp->tail->size) { | |
| 209 remove_buf(mp); | |
| 210 } | |
| 211 } | |
| 212 | |
| 213 *done = 0; | |
| 214 if(mp->fr.error_protection) | |
| 215 getbits(16); | |
| 216 switch(mp->fr.lay) { | |
| 217 case 1: | |
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218 do_layer1(&mp->fr,(unsigned char *) out,done,mp); |
| 261 | 219 break; |
| 220 case 2: | |
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221 do_layer2(&mp->fr,(unsigned char *) out,done,mp); |
| 261 | 222 break; |
| 223 case 3: | |
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224 do_layer3(&mp->fr,(unsigned char *) out,done,mp); |
| 261 | 225 break; |
| 226 } | |
| 227 | |
| 228 mp->fsizeold = mp->framesize; | |
| 229 mp->framesize = 0; | |
| 230 | |
| 231 return MP3_OK; | |
| 232 } | |
| 233 | |
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234 int set_pointer(long backstep, struct mpstr *mp) |
| 261 | 235 { |
| 236 unsigned char *bsbufold; | |
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237 if(mp->fsizeold < 0 && backstep > 0) { |
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238 Sound_SetError("MPGLIB: Can't step back!"); /* FIXME: need formatting: %ld!\n",backstep); */ |
| 261 | 239 return MP3_ERR; |
| 240 } | |
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241 bsbufold = mp->bsspace[mp->bsnum] + 512; |
| 261 | 242 wordpointer -= backstep; |
| 243 if (backstep) | |
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244 memcpy(wordpointer,bsbufold+mp->fsizeold-backstep,backstep); |
| 261 | 245 bitindex = 0; |
| 246 return MP3_OK; | |
| 247 } | |
| 248 | |
| 249 | |
| 250 | |
| 251 |