Mercurial > SDL_sound_CoreAudio
annotate decoders/mpglib/interface.c @ 274:9e7f9e09ea0e
Removed fprintf() calls. Replaced with SNDDBG() and Sound_SetError() calls.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sun, 10 Mar 2002 19:15:25 +0000 |
| parents | e1429f96aded |
| children | 52b9f37998db |
| 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 */ | |
| 14 struct mpstr *gmp; | |
| 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 gmp = mp; | |
| 162 | |
| 163 if(osize < 4608) { | |
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274
9e7f9e09ea0e
Removed fprintf() calls. Replaced with SNDDBG() and Sound_SetError() calls.
Ryan C. Gordon <icculus@icculus.org>
parents:
273
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changeset
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164 Sound_SetError("MPGLIB: Not enough output space for decoding!"); |
| 261 | 165 return MP3_ERR; |
| 166 } | |
| 167 | |
| 168 if(in) { | |
| 169 if(addbuf(mp,in,isize) == NULL) { | |
| 170 return MP3_ERR; | |
| 171 } | |
| 172 } | |
| 173 | |
| 174 /* First decode header */ | |
| 175 if(mp->framesize == 0) { | |
| 176 if(mp->bsize < 4) { | |
| 177 return MP3_NEED_MORE; | |
| 178 } | |
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179 |
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180 if (!read_head(mp)) |
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181 return MP3_ERR; |
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182 |
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183 if (!decode_header(&mp->fr,mp->header)) |
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184 return MP3_ERR; |
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185 |
| 261 | 186 mp->framesize = mp->fr.framesize; |
| 187 } | |
| 188 | |
| 189 if(mp->fr.framesize > mp->bsize) | |
| 190 return MP3_NEED_MORE; | |
| 191 | |
| 192 wordpointer = mp->bsspace[mp->bsnum] + 512; | |
| 193 mp->bsnum = (mp->bsnum + 1) & 0x1; | |
| 194 bitindex = 0; | |
| 195 | |
| 196 len = 0; | |
| 197 while(len < mp->framesize) { | |
| 198 int nlen; | |
| 199 int blen = mp->tail->size - mp->tail->pos; | |
| 200 if( (mp->framesize - len) <= blen) { | |
| 201 nlen = mp->framesize-len; | |
| 202 } | |
| 203 else { | |
| 204 nlen = blen; | |
| 205 } | |
| 206 memcpy(wordpointer+len,mp->tail->pnt+mp->tail->pos,nlen); | |
| 207 len += nlen; | |
| 208 mp->tail->pos += nlen; | |
| 209 mp->bsize -= nlen; | |
| 210 if(mp->tail->pos == mp->tail->size) { | |
| 211 remove_buf(mp); | |
| 212 } | |
| 213 } | |
| 214 | |
| 215 *done = 0; | |
| 216 if(mp->fr.error_protection) | |
| 217 getbits(16); | |
| 218 switch(mp->fr.lay) { | |
| 219 case 1: | |
| 220 do_layer1(&mp->fr,(unsigned char *) out,done); | |
| 221 break; | |
| 222 case 2: | |
| 223 do_layer2(&mp->fr,(unsigned char *) out,done); | |
| 224 break; | |
| 225 case 3: | |
| 226 do_layer3(&mp->fr,(unsigned char *) out,done); | |
| 227 break; | |
| 228 } | |
| 229 | |
| 230 mp->fsizeold = mp->framesize; | |
| 231 mp->framesize = 0; | |
| 232 | |
| 233 return MP3_OK; | |
| 234 } | |
| 235 | |
| 236 int set_pointer(long backstep) | |
| 237 { | |
| 238 unsigned char *bsbufold; | |
| 239 if(gmp->fsizeold < 0 && backstep > 0) { | |
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240 Sound_SetError("MPGLIB: Can't step back!"); /* FIXME: need formatting: %ld!\n",backstep); */ |
| 261 | 241 return MP3_ERR; |
| 242 } | |
| 243 bsbufold = gmp->bsspace[gmp->bsnum] + 512; | |
| 244 wordpointer -= backstep; | |
| 245 if (backstep) | |
| 246 memcpy(wordpointer,bsbufold+gmp->fsizeold-backstep,backstep); | |
| 247 bitindex = 0; | |
| 248 return MP3_OK; | |
| 249 } | |
| 250 | |
| 251 | |
| 252 | |
| 253 |