Mercurial > SDL_sound_CoreAudio
annotate decoders/mpglib/interface.c @ 431:54a68e39fa7c
Updated.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Tue, 10 Dec 2002 02:14:47 +0000 |
| parents | 9d0b5ec9cc26 |
| children |
| 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) ); | |
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56 BAIL_IF_MACRO(!nbuf, ERR_OUT_OF_MEMORY, NULL); |
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57 |
| 261 | 58 nbuf->pnt = malloc(size); |
| 59 if(!nbuf->pnt) { | |
| 60 free(nbuf); | |
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61 BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL); |
| 261 | 62 } |
| 63 nbuf->size = size; | |
| 64 memcpy(nbuf->pnt,buf,size); | |
| 65 nbuf->next = NULL; | |
| 66 nbuf->prev = mp->head; | |
| 67 nbuf->pos = 0; | |
| 68 | |
| 69 if(!mp->tail) { | |
| 70 mp->tail = nbuf; | |
| 71 } | |
| 72 else { | |
| 73 mp->head->next = nbuf; | |
| 74 } | |
| 75 | |
| 76 mp->head = nbuf; | |
| 77 mp->bsize += size; | |
| 78 | |
| 79 return nbuf; | |
| 80 } | |
| 81 | |
| 82 static void remove_buf(struct mpstr *mp) | |
| 83 { | |
| 84 struct buf *buf = mp->tail; | |
| 85 | |
| 86 mp->tail = buf->next; | |
| 87 if(mp->tail) | |
| 88 mp->tail->prev = NULL; | |
| 89 else { | |
| 90 mp->tail = mp->head = NULL; | |
| 91 } | |
| 92 | |
| 93 free(buf->pnt); | |
| 94 free(buf); | |
| 95 | |
| 96 } | |
| 97 | |
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98 static int read_buf_byte(struct mpstr *mp, unsigned long *retval) |
| 261 | 99 { |
| 100 int pos; | |
| 101 | |
| 102 pos = mp->tail->pos; | |
| 103 while(pos >= mp->tail->size) { | |
| 104 remove_buf(mp); | |
| 105 pos = mp->tail->pos; | |
| 106 if(!mp->tail) { | |
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107 BAIL_MACRO("MPGLIB: Short read in read_buf_byte()!", 0); |
| 261 | 108 } |
| 109 } | |
| 110 | |
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111 if (retval != NULL) |
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112 *retval = mp->tail->pnt[pos]; |
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113 |
| 261 | 114 mp->bsize--; |
| 115 mp->tail->pos++; | |
| 116 | |
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117 return 1; |
| 261 | 118 } |
| 119 | |
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120 static int read_head(struct mpstr *mp) |
| 261 | 121 { |
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122 unsigned long val; |
| 261 | 123 unsigned long head; |
| 124 | |
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125 if (!read_buf_byte(mp, &val)) |
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126 return 0; |
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127 |
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128 head = val << 8; |
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129 |
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130 if (!read_buf_byte(mp, &val)) |
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131 return 0; |
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132 |
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133 head |= val; |
| 261 | 134 head <<= 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; |
| 261 | 144 |
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145 head |= val; |
| 261 | 146 mp->header = head; |
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147 return 1; |
| 261 | 148 } |
| 149 | |
| 150 int decodeMP3(struct mpstr *mp,char *in,int isize,char *out, | |
| 151 int osize,int *done) | |
| 152 { | |
| 153 int len; | |
| 154 | |
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155 BAIL_IF_MACRO(osize < 4608, "MPGLIB: Output buffer too small", MP3_ERR); |
| 261 | 156 |
| 157 if(in) { | |
| 158 if(addbuf(mp,in,isize) == NULL) { | |
| 159 return MP3_ERR; | |
| 160 } | |
| 161 } | |
| 162 | |
| 163 /* First decode header */ | |
| 164 if(mp->framesize == 0) { | |
| 165 if(mp->bsize < 4) { | |
| 166 return MP3_NEED_MORE; | |
| 167 } | |
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168 |
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169 if (!read_head(mp)) |
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170 return MP3_ERR; |
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171 |
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172 if (!decode_header(&mp->fr,mp->header)) |
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173 return MP3_ERR; |
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174 |
| 261 | 175 mp->framesize = mp->fr.framesize; |
| 176 } | |
| 177 | |
| 178 if(mp->fr.framesize > mp->bsize) | |
| 179 return MP3_NEED_MORE; | |
| 180 | |
| 181 wordpointer = mp->bsspace[mp->bsnum] + 512; | |
| 182 mp->bsnum = (mp->bsnum + 1) & 0x1; | |
| 183 bitindex = 0; | |
| 184 | |
| 185 len = 0; | |
| 186 while(len < mp->framesize) { | |
| 187 int nlen; | |
| 188 int blen = mp->tail->size - mp->tail->pos; | |
| 189 if( (mp->framesize - len) <= blen) { | |
| 190 nlen = mp->framesize-len; | |
| 191 } | |
| 192 else { | |
| 193 nlen = blen; | |
| 194 } | |
| 195 memcpy(wordpointer+len,mp->tail->pnt+mp->tail->pos,nlen); | |
| 196 len += nlen; | |
| 197 mp->tail->pos += nlen; | |
| 198 mp->bsize -= nlen; | |
| 199 if(mp->tail->pos == mp->tail->size) { | |
| 200 remove_buf(mp); | |
| 201 } | |
| 202 } | |
| 203 | |
| 204 *done = 0; | |
| 205 if(mp->fr.error_protection) | |
| 206 getbits(16); | |
| 207 switch(mp->fr.lay) { | |
| 208 case 1: | |
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209 do_layer1(&mp->fr,(unsigned char *) out,done,mp); |
| 261 | 210 break; |
| 211 case 2: | |
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212 do_layer2(&mp->fr,(unsigned char *) out,done,mp); |
| 261 | 213 break; |
| 214 case 3: | |
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215 do_layer3(&mp->fr,(unsigned char *) out,done,mp); |
| 261 | 216 break; |
| 217 } | |
| 218 | |
| 219 mp->fsizeold = mp->framesize; | |
| 220 mp->framesize = 0; | |
| 221 | |
| 222 return MP3_OK; | |
| 223 } | |
| 224 | |
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225 int set_pointer(long backstep, struct mpstr *mp) |
| 261 | 226 { |
| 227 unsigned char *bsbufold; | |
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228 if(mp->fsizeold < 0 && backstep > 0) { |
| 400 | 229 char err[128]; |
| 230 snprintf(err, sizeof (err), "MPGLIB: Can't step back! %ld!", backstep); | |
| 231 BAIL_MACRO(err, MP3_ERR); | |
| 261 | 232 } |
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233 bsbufold = mp->bsspace[mp->bsnum] + 512; |
| 261 | 234 wordpointer -= backstep; |
| 235 if (backstep) | |
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236 memcpy(wordpointer,bsbufold+mp->fsizeold-backstep,backstep); |
| 261 | 237 bitindex = 0; |
| 238 return MP3_OK; | |
| 239 } | |
| 240 | |
| 241 | |
| 242 | |
| 243 |