Mercurial > SDL_sound_CoreAudio
annotate decoders/mpglib/interface.c @ 355:5dbf2f9cde00
Added docs stuff.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 07 Jun 2002 13:26:13 +0000 |
| parents | ad4c8f34136a |
| children | fb519e6028e3 |
| rev | line source |
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| 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 | |
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14 BOOL InitMP3(struct mpstr *mp) |
| 261 | 15 { |
| 16 static int init = 0; | |
| 17 | |
| 18 memset(mp,0,sizeof(struct mpstr)); | |
| 19 | |
| 20 mp->framesize = 0; | |
| 21 mp->fsizeold = -1; | |
| 22 mp->bsize = 0; | |
| 23 mp->head = mp->tail = NULL; | |
| 24 mp->fr.single = -1; | |
| 25 mp->bsnum = 0; | |
| 26 mp->synth_bo = 1; | |
| 27 | |
| 28 if(!init) { | |
| 29 init = 1; | |
| 30 make_decode_tables(32767); | |
| 31 init_layer2(); | |
| 32 init_layer3(SBLIMIT); | |
| 33 } | |
| 34 | |
| 35 return !0; | |
| 36 } | |
| 37 | |
| 38 void ExitMP3(struct mpstr *mp) | |
| 39 { | |
| 40 struct buf *b,*bn; | |
| 41 | |
| 42 b = mp->tail; | |
| 43 while(b) { | |
| 44 free(b->pnt); | |
| 45 bn = b->next; | |
| 46 free(b); | |
| 47 b = bn; | |
| 48 } | |
| 49 } | |
| 50 | |
| 51 static struct buf *addbuf(struct mpstr *mp,char *buf,int size) | |
| 52 { | |
| 53 struct buf *nbuf; | |
| 54 | |
| 55 nbuf = malloc( sizeof(struct buf) ); | |
| 56 if(!nbuf) { | |
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57 Sound_SetError("MPGLIB: Out of memory!"); |
| 261 | 58 return NULL; |
| 59 } | |
| 60 nbuf->pnt = malloc(size); | |
| 61 if(!nbuf->pnt) { | |
| 62 free(nbuf); | |
| 63 return NULL; | |
| 64 } | |
| 65 nbuf->size = size; | |
| 66 memcpy(nbuf->pnt,buf,size); | |
| 67 nbuf->next = NULL; | |
| 68 nbuf->prev = mp->head; | |
| 69 nbuf->pos = 0; | |
| 70 | |
| 71 if(!mp->tail) { | |
| 72 mp->tail = nbuf; | |
| 73 } | |
| 74 else { | |
| 75 mp->head->next = nbuf; | |
| 76 } | |
| 77 | |
| 78 mp->head = nbuf; | |
| 79 mp->bsize += size; | |
| 80 | |
| 81 return nbuf; | |
| 82 } | |
| 83 | |
| 84 static void remove_buf(struct mpstr *mp) | |
| 85 { | |
| 86 struct buf *buf = mp->tail; | |
| 87 | |
| 88 mp->tail = buf->next; | |
| 89 if(mp->tail) | |
| 90 mp->tail->prev = NULL; | |
| 91 else { | |
| 92 mp->tail = mp->head = NULL; | |
| 93 } | |
| 94 | |
| 95 free(buf->pnt); | |
| 96 free(buf); | |
| 97 | |
| 98 } | |
| 99 | |
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100 static int read_buf_byte(struct mpstr *mp, unsigned long *retval) |
| 261 | 101 { |
| 102 int pos; | |
| 103 | |
| 104 pos = mp->tail->pos; | |
| 105 while(pos >= mp->tail->size) { | |
| 106 remove_buf(mp); | |
| 107 pos = mp->tail->pos; | |
| 108 if(!mp->tail) { | |
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109 Sound_SetError("MPGLIB: Fatal error! Short read in read_buf_byte()!"); |
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110 return 0; |
| 261 | 111 } |
| 112 } | |
| 113 | |
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114 if (retval != NULL) |
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115 *retval = mp->tail->pnt[pos]; |
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116 |
| 261 | 117 mp->bsize--; |
| 118 mp->tail->pos++; | |
| 119 | |
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120 return 1; |
| 261 | 121 } |
| 122 | |
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123 static int read_head(struct mpstr *mp) |
| 261 | 124 { |
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125 unsigned long val; |
| 261 | 126 unsigned long head; |
| 127 | |
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128 if (!read_buf_byte(mp, &val)) |
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129 return 0; |
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130 |
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131 head = val << 8; |
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132 |
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133 if (!read_buf_byte(mp, &val)) |
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134 return 0; |
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135 |
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136 head |= val; |
| 261 | 137 head <<= 8; |
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138 |
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139 if (!read_buf_byte(mp, &val)) |
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140 return 0; |
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141 |
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142 head |= val; |
| 261 | 143 head <<= 8; |
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144 |
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145 if (!read_buf_byte(mp, &val)) |
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146 return 0; |
| 261 | 147 |
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148 head |= val; |
| 261 | 149 mp->header = head; |
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150 return 1; |
| 261 | 151 } |
| 152 | |
| 153 int decodeMP3(struct mpstr *mp,char *in,int isize,char *out, | |
| 154 int osize,int *done) | |
| 155 { | |
| 156 int len; | |
| 157 | |
| 158 if(osize < 4608) { | |
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159 Sound_SetError("MPGLIB: Not enough output space for decoding!"); |
| 261 | 160 return MP3_ERR; |
| 161 } | |
| 162 | |
| 163 if(in) { | |
| 164 if(addbuf(mp,in,isize) == NULL) { | |
| 165 return MP3_ERR; | |
| 166 } | |
| 167 } | |
| 168 | |
| 169 /* First decode header */ | |
| 170 if(mp->framesize == 0) { | |
| 171 if(mp->bsize < 4) { | |
| 172 return MP3_NEED_MORE; | |
| 173 } | |
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174 |
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175 if (!read_head(mp)) |
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176 return MP3_ERR; |
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177 |
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178 if (!decode_header(&mp->fr,mp->header)) |
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179 return MP3_ERR; |
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180 |
| 261 | 181 mp->framesize = mp->fr.framesize; |
| 182 } | |
| 183 | |
| 184 if(mp->fr.framesize > mp->bsize) | |
| 185 return MP3_NEED_MORE; | |
| 186 | |
| 187 wordpointer = mp->bsspace[mp->bsnum] + 512; | |
| 188 mp->bsnum = (mp->bsnum + 1) & 0x1; | |
| 189 bitindex = 0; | |
| 190 | |
| 191 len = 0; | |
| 192 while(len < mp->framesize) { | |
| 193 int nlen; | |
| 194 int blen = mp->tail->size - mp->tail->pos; | |
| 195 if( (mp->framesize - len) <= blen) { | |
| 196 nlen = mp->framesize-len; | |
| 197 } | |
| 198 else { | |
| 199 nlen = blen; | |
| 200 } | |
| 201 memcpy(wordpointer+len,mp->tail->pnt+mp->tail->pos,nlen); | |
| 202 len += nlen; | |
| 203 mp->tail->pos += nlen; | |
| 204 mp->bsize -= nlen; | |
| 205 if(mp->tail->pos == mp->tail->size) { | |
| 206 remove_buf(mp); | |
| 207 } | |
| 208 } | |
| 209 | |
| 210 *done = 0; | |
| 211 if(mp->fr.error_protection) | |
| 212 getbits(16); | |
| 213 switch(mp->fr.lay) { | |
| 214 case 1: | |
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215 do_layer1(&mp->fr,(unsigned char *) out,done,mp); |
| 261 | 216 break; |
| 217 case 2: | |
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218 do_layer2(&mp->fr,(unsigned char *) out,done,mp); |
| 261 | 219 break; |
| 220 case 3: | |
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221 do_layer3(&mp->fr,(unsigned char *) out,done,mp); |
| 261 | 222 break; |
| 223 } | |
| 224 | |
| 225 mp->fsizeold = mp->framesize; | |
| 226 mp->framesize = 0; | |
| 227 | |
| 228 return MP3_OK; | |
| 229 } | |
| 230 | |
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231 int set_pointer(long backstep, struct mpstr *mp) |
| 261 | 232 { |
| 233 unsigned char *bsbufold; | |
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234 if(mp->fsizeold < 0 && backstep > 0) { |
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235 Sound_SetError("MPGLIB: Can't step back!"); /* FIXME: need formatting: %ld!\n",backstep); */ |
| 261 | 236 return MP3_ERR; |
| 237 } | |
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238 bsbufold = mp->bsspace[mp->bsnum] + 512; |
| 261 | 239 wordpointer -= backstep; |
| 240 if (backstep) | |
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241 memcpy(wordpointer,bsbufold+mp->fsizeold-backstep,backstep); |
| 261 | 242 bitindex = 0; |
| 243 return MP3_OK; | |
| 244 } | |
| 245 | |
| 246 | |
| 247 | |
| 248 |