extern/ffmpeg/libavcodec/adx.c

   1 /*
   2  * ADX ADPCM codecs
   3  * Copyright (c) 2001,2003 BERO
   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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19 #include "avcodec.h"
  20
  21 /**
  22  * @file adx.c
  23  * SEGA CRI adx codecs.
  24  *
  25  * Reference documents:
  26  * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
  27  * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
  28  */
  29
  30 typedef struct {
  31     int s1,s2;
  32 } PREV;
  33
  34 typedef struct {
  35     PREV prev[2];
  36     int header_parsed;
  37     unsigned char dec_temp[18*2];
  38     unsigned short enc_temp[32*2];
  39     int in_temp;
  40 } ADXContext;
  41
  42 //#define    BASEVOL    0x11e0
  43 #define    BASEVOL   0x4000
  44 #define    SCALE1    0x7298
  45 #define    SCALE2    0x3350
  46
  47 #define    CLIP(s)    if (s>32767) s=32767; else if (s<-32768) s=-32768
  48
  49 /* 18 bytes <-> 32 samples */
  50
  51 #ifdef CONFIG_ENCODERS
  52 static void adx_encode(unsigned char *adx,const short *wav,PREV *prev)
  53 {
  54     int scale;
  55     int i;
  56     int s0,s1,s2,d;
  57     int max=0;
  58     int min=0;
  59     int data[32];
  60
  61     s1 = prev->s1;
  62     s2 = prev->s2;
  63     for(i=0;i<32;i++) {
  64         s0 = wav[i];
  65         d = ((s0<<14) - SCALE1*s1 + SCALE2*s2)/BASEVOL;
  66         data[i]=d;
  67         if (max<d) max=d;
  68         if (min>d) min=d;
  69         s2 = s1;
  70         s1 = s0;
  71     }
  72     prev->s1 = s1;
  73     prev->s2 = s2;
  74
  75     /* -8..+7 */
  76
  77     if (max==0 && min==0) {
  78         memset(adx,0,18);
  79         return;
  80     }
  81
  82     if (max/7>-min/8) scale = max/7;
  83     else scale = -min/8;
  84
  85     if (scale==0) scale=1;
  86
  87     adx[0] = scale>>8;
  88     adx[1] = scale;
  89
  90     for(i=0;i<16;i++) {
  91         adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf);
  92     }
  93 }
  94 #endif //CONFIG_ENCODERS
  95
  96 static void adx_decode(short *out,const unsigned char *in,PREV *prev)
  97 {
  98     int scale = ((in[0]<<8)|(in[1]));
  99     int i;
 100     int s0,s1,s2,d;
 101
 102 //    printf("%x ",scale);
 103
 104     in+=2;
 105     s1 = prev->s1;
 106     s2 = prev->s2;
 107     for(i=0;i<16;i++) {
 108         d = in[i];
 109         // d>>=4; if (d&8) d-=16;
 110         d = ((signed char)d >> 4);
 111         s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14;
 112         CLIP(s0);
 113         *out++=s0;
 114         s2 = s1;
 115         s1 = s0;
 116
 117         d = in[i];
 118         //d&=15; if (d&8) d-=16;
 119         d = ((signed char)(d<<4) >> 4);
 120         s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14;
 121         CLIP(s0);
 122         *out++=s0;
 123         s2 = s1;
 124         s1 = s0;
 125     }
 126     prev->s1 = s1;
 127     prev->s2 = s2;
 128
 129 }
 130
 131 static void adx_decode_stereo(short *out,const unsigned char *in,PREV *prev)
 132 {
 133     short tmp[32*2];
 134     int i;
 135
 136     adx_decode(tmp   ,in   ,prev);
 137     adx_decode(tmp+32,in+18,prev+1);
 138     for(i=0;i<32;i++) {
 139         out[i*2]   = tmp[i];
 140         out[i*2+1] = tmp[i+32];
 141     }
 142 }
 143
 144 #ifdef CONFIG_ENCODERS
 145
 146 static void write_long(unsigned char *p,uint32_t v)
 147 {
 148     p[0] = v>>24;
 149     p[1] = v>>16;
 150     p[2] = v>>8;
 151     p[3] = v;
 152 }
 153
 154 static int adx_encode_header(AVCodecContext *avctx,unsigned char *buf,size_t bufsize)
 155 {
 156 #if 0
 157     struct {
 158         uint32_t offset; /* 0x80000000 + sample start - 4 */
 159         unsigned char unknown1[3]; /* 03 12 04 */
 160         unsigned char channel; /* 1 or 2 */
 161         uint32_t freq;
 162         uint32_t size;
 163         uint32_t unknown2; /* 01 f4 03 00 */
 164         uint32_t unknown3; /* 00 00 00 00 */
 165         uint32_t unknown4; /* 00 00 00 00 */
 166
 167     /* if loop
 168         unknown3 00 15 00 01
 169         unknown4 00 00 00 01
 170         long loop_start_sample;
 171         long loop_start_byte;
 172         long loop_end_sample;
 173         long loop_end_byte;
 174         long
 175     */
 176     } adxhdr; /* big endian */
 177     /* offset-6 "(c)CRI" */
 178 #endif
 179     write_long(buf+0x00,0x80000000|0x20);
 180     write_long(buf+0x04,0x03120400|avctx->channels);
 181     write_long(buf+0x08,avctx->sample_rate);
 182     write_long(buf+0x0c,0); /* FIXME: set after */
 183     write_long(buf+0x10,0x01040300);
 184     write_long(buf+0x14,0x00000000);
 185     write_long(buf+0x18,0x00000000);
 186     memcpy(buf+0x1c,"\0\0(c)CRI",8);
 187     return 0x20+4;
 188 }
 189
 190 static int adx_decode_init(AVCodecContext *avctx);
 191 static int adx_encode_init(AVCodecContext *avctx)
 192 {
 193     if (avctx->channels > 2)
 194         return -1; /* only stereo or mono =) */
 195     avctx->frame_size = 32;
 196
 197     avctx->coded_frame= avcodec_alloc_frame();
 198     avctx->coded_frame->key_frame= 1;
 199
 200 //    avctx->bit_rate = avctx->sample_rate*avctx->channels*18*8/32;
 201
 202     av_log(avctx, AV_LOG_DEBUG, "adx encode init\n");
 203     adx_decode_init(avctx);
 204
 205     return 0;
 206 }
 207
 208 static int adx_encode_close(AVCodecContext *avctx)
 209 {
 210     av_freep(&avctx->coded_frame);
 211
 212     return 0;
 213 }
 214
 215 static int adx_encode_frame(AVCodecContext *avctx,
 216                 uint8_t *frame, int buf_size, void *data)
 217 {
 218     ADXContext *c = avctx->priv_data;
 219     const short *samples = data;
 220     unsigned char *dst = frame;
 221     int rest = avctx->frame_size;
 222
 223 /*
 224     input data size =
 225     ffmpeg.c: do_audio_out()
 226     frame_bytes = enc->frame_size * 2 * enc->channels;
 227 */
 228
 229 //    printf("sz=%d ",buf_size); fflush(stdout);
 230     if (!c->header_parsed) {
 231         int hdrsize = adx_encode_header(avctx,dst,buf_size);
 232         dst+=hdrsize;
 233         c->header_parsed = 1;
 234     }
 235
 236     if (avctx->channels==1) {
 237         while(rest>=32) {
 238             adx_encode(dst,samples,c->prev);
 239             dst+=18;
 240             samples+=32;
 241             rest-=32;
 242         }
 243     } else {
 244         while(rest>=32*2) {
 245             short tmpbuf[32*2];
 246             int i;
 247
 248             for(i=0;i<32;i++) {
 249                 tmpbuf[i] = samples[i*2];
 250                 tmpbuf[i+32] = samples[i*2+1];
 251             }
 252
 253             adx_encode(dst,tmpbuf,c->prev);
 254             adx_encode(dst+18,tmpbuf+32,c->prev+1);
 255             dst+=18*2;
 256             samples+=32*2;
 257             rest-=32*2;
 258         }
 259     }
 260     return dst-frame;
 261 }
 262
 263 #endif //CONFIG_ENCODERS
 264
 265 static uint32_t read_long(const unsigned char *p)
 266 {
 267     return (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3];
 268 }
 269
 270 int is_adx(const unsigned char *buf,size_t bufsize)
 271 {
 272     int    offset;
 273
 274     if (buf[0]!=0x80) return 0;
 275     offset = (read_long(buf)^0x80000000)+4;
 276     if (bufsize<offset || memcmp(buf+offset-6,"(c)CRI",6)) return 0;
 277     return offset;
 278 }
 279
 280 /* return data offset or 6 */
 281 static int adx_decode_header(AVCodecContext *avctx,const unsigned char *buf,size_t bufsize)
 282 {
 283     int offset;
 284     int channels,freq,size;
 285
 286     offset = is_adx(buf,bufsize);
 287     if (offset==0) return 0;
 288
 289     channels = buf[7];
 290     freq = read_long(buf+8);
 291     size = read_long(buf+12);
 292
 293 //    printf("freq=%d ch=%d\n",freq,channels);
 294
 295     avctx->sample_rate = freq;
 296     avctx->channels = channels;
 297     avctx->bit_rate = freq*channels*18*8/32;
 298 //    avctx->frame_size = 18*channels;
 299
 300     return offset;
 301 }
 302
 303 static int adx_decode_init(AVCodecContext * avctx)
 304 {
 305     ADXContext *c = avctx->priv_data;
 306
 307 //    printf("adx_decode_init\n"); fflush(stdout);
 308     c->prev[0].s1 = 0;
 309     c->prev[0].s2 = 0;
 310     c->prev[1].s1 = 0;
 311     c->prev[1].s2 = 0;
 312     c->header_parsed = 0;
 313     c->in_temp = 0;
 314     return 0;
 315 }
 316
 317 #if 0
 318 static void dump(unsigned char *buf,size_t len)
 319 {
 320     int i;
 321     for(i=0;i<len;i++) {
 322         if ((i&15)==0) av_log(NULL, AV_LOG_DEBUG, "%04x  ",i);
 323         av_log(NULL, AV_LOG_DEBUG, "%02x ",buf[i]);
 324         if ((i&15)==15) av_log(NULL, AV_LOG_DEBUG, "\n");
 325     }
 326     av_log(NULL, AV_LOG_ERROR, "\n");
 327 }
 328 #endif
 329
 330 static int adx_decode_frame(AVCodecContext *avctx,
 331                 void *data, int *data_size,
 332                 uint8_t *buf0, int buf_size)
 333 {
 334     ADXContext *c = avctx->priv_data;
 335     short *samples = data;
 336     const uint8_t *buf = buf0;
 337     int rest = buf_size;
 338
 339     if (!c->header_parsed) {
 340         int hdrsize = adx_decode_header(avctx,buf,rest);
 341         if (hdrsize==0) return -1;
 342         c->header_parsed = 1;
 343         buf  += hdrsize;
 344         rest -= hdrsize;
 345     }
 346
 347     if (c->in_temp) {
 348         int copysize = 18*avctx->channels - c->in_temp;
 349         memcpy(c->dec_temp+c->in_temp,buf,copysize);
 350         rest -= copysize;
 351         buf  += copysize;
 352         if (avctx->channels==1) {
 353             adx_decode(samples,c->dec_temp,c->prev);
 354             samples += 32;
 355         } else {
 356             adx_decode_stereo(samples,c->dec_temp,c->prev);
 357             samples += 32*2;
 358         }
 359     }
 360     //
 361     if (avctx->channels==1) {
 362         while(rest>=18) {
 363             adx_decode(samples,buf,c->prev);
 364             rest-=18;
 365             buf+=18;
 366             samples+=32;
 367         }
 368     } else {
 369         while(rest>=18*2) {
 370             adx_decode_stereo(samples,buf,c->prev);
 371             rest-=18*2;
 372             buf+=18*2;
 373             samples+=32*2;
 374         }
 375     }
 376     //
 377     c->in_temp = rest;
 378     if (rest) {
 379         memcpy(c->dec_temp,buf,rest);
 380         buf+=rest;
 381     }
 382     *data_size = (uint8_t*)samples - (uint8_t*)data;
 383 //    printf("%d:%d ",buf-buf0,*data_size); fflush(stdout);
 384     return buf-buf0;
 385 }
 386
 387 #ifdef CONFIG_ENCODERS
 388 AVCodec adx_adpcm_encoder = {
 389     "adx_adpcm",
 390     CODEC_TYPE_AUDIO,
 391     CODEC_ID_ADPCM_ADX,
 392     sizeof(ADXContext),
 393     adx_encode_init,
 394     adx_encode_frame,
 395     adx_encode_close,
 396     NULL,
 397 };
 398 #endif //CONFIG_ENCODERS
 399
 400 AVCodec adx_adpcm_decoder = {
 401     "adx_adpcm",
 402     CODEC_TYPE_AUDIO,
 403     CODEC_ID_ADPCM_ADX,
 404     sizeof(ADXContext),
 405     adx_decode_init,
 406     NULL,
 407     NULL,
 408     adx_decode_frame,
 409 };
 410