apps/codecs/aiff_enc.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006 Antonius Hellmann
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include <inttypes.h>
  23 #include "codeclib.h"
  24
  25 CODEC_ENC_HEADER
  26
  27 struct aiff_header
  28 {
  29     uint8_t   form_id[4];           /* 00h - 'FORM'                          */
  30     uint32_t  form_size;            /* 04h - size of file - 8                */
  31     uint8_t   aiff_id[4];           /* 08h - 'AIFF'                          */
  32     uint8_t   comm_id[4];           /* 0Ch - 'COMM'                          */
  33     int32_t   comm_size;            /* 10h - num_channels through sample_rate
  34                                              (18)                            */
  35     int16_t   num_channels;         /* 14h - 1=M, 2=S, etc.                  */
  36     uint32_t  num_sample_frames;    /* 16h - num samples for each channel    */
  37     int16_t   sample_size;          /* 1ah - 1-32 bits per sample            */
  38     uint8_t   sample_rate[10];      /* 1ch - IEEE 754 80-bit floating point  */
  39     uint8_t   ssnd_id[4];           /* 26h - "SSND"                          */
  40     int32_t   ssnd_size;            /* 2ah - size of chunk from offset to
  41                                              end of pcm data                 */
  42     uint32_t  offset;               /* 2eh - data offset from end of header  */
  43     uint32_t  block_size;           /* 32h - pcm data alignment              */
  44                                     /* 36h */
  45 } __attribute__((packed));
  46
  47 #define PCM_DEPTH_BYTES             2
  48 #define PCM_DEPTH_BITS             16
  49 #define PCM_SAMP_PER_CHUNK       2048
  50 #define PCM_CHUNK_SIZE          (PCM_SAMP_PER_CHUNK*4)
  51
  52 /* Template headers */
  53 struct aiff_header aiff_header =
  54 {
  55     { 'F', 'O', 'R', 'M' },             /* form_id               */
  56     0,                                  /* form_size         (*) */
  57     { 'A', 'I', 'F', 'F' },             /* aiff_id               */
  58     { 'C', 'O', 'M', 'M' },             /* comm_id               */
  59     H_TO_BE32(18),                      /* comm_size             */
  60     0,                                  /* num_channels      (*) */
  61     0,                                  /* num_sample_frames (*) */
  62     H_TO_BE16(PCM_DEPTH_BITS),          /* sample_size           */
  63     { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },   /* sample_rate       (*) */
  64     { 'S', 'S', 'N', 'D' },             /* ssnd_id               */
  65     0,                                  /* ssnd_size         (*) */
  66     H_TO_BE32(0),                       /* offset                */
  67     H_TO_BE32(0),                       /* block_size            */
  68 };
  69
  70 /* (*) updated when finalizing file */
  71
  72 static int      num_channels IBSS_ATTR;
  73 static int      rec_mono_mode IBSS_ATTR;
  74 static uint32_t sample_rate;
  75 static uint32_t enc_size;
  76 static int32_t  err          IBSS_ATTR;
  77
  78 /* convert unsigned 32 bit value to 80-bit floating point number */
  79 STATICIRAM void uint32_h_to_ieee754_extended_be(uint8_t f[10], uint32_t l)
  80                                                 ICODE_ATTR;
  81 STATICIRAM void uint32_h_to_ieee754_extended_be(uint8_t f[10], uint32_t l)
  82 {
  83     int32_t exp;
  84
  85     ci->memset(f, 0, 10);
  86
  87     if (l == 0)
  88         return;
  89
  90     for (exp = 30; (l & (1ul << 31)) == 0; exp--)
  91         l <<= 1;
  92
  93     /* sign always zero - bit 79 */
  94     /* exponent is 0-31 (normalized: 31 - shift + 16383) - bits 64-78 */
  95     f[0] = 0x40;
  96     f[1] = (uint8_t)exp;
  97     /* mantissa is value left justified with most significant non-zero
  98        bit stored in bit 63 - bits 0-63 */
  99     *(uint32_t *)&f[2] = htobe32(l);
 100 } /* uint32_h_to_ieee754_extended_be */
 101
 102 /* called version often - inline */
 103 static inline bool is_file_data_ok(struct enc_file_event_data *data) ICODE_ATTR;
 104 static inline bool is_file_data_ok(struct enc_file_event_data *data)
 105 {
 106     return data->rec_file >= 0 && (long)data->chunk->flags >= 0;
 107 } /* is_file_data_ok */
 108
 109 /* called version often - inline */
 110 static inline bool on_write_chunk(struct enc_file_event_data *data) ICODE_ATTR;
 111 static inline bool on_write_chunk(struct enc_file_event_data *data)
 112 {
 113     if (!is_file_data_ok(data))
 114         return false;
 115
 116     if (data->chunk->enc_data == NULL)
 117     {
 118 #ifdef ROCKBOX_HAS_LOGF
 119         ci->logf("aiff enc: NULL data");
 120 #endif
 121         return true;
 122     }
 123
 124     if (ci->write(data->rec_file, data->chunk->enc_data,
 125                   data->chunk->enc_size) != (ssize_t)data->chunk->enc_size)
 126         return false;
 127
 128     data->num_pcm_samples += data->chunk->num_pcm;
 129     return true;
 130 } /* on_write_chunk */
 131
 132 static bool on_start_file(struct enc_file_event_data *data)
 133 {
 134     if ((data->chunk->flags & CHUNKF_ERROR) || *data->filename == '\0')
 135         return false;
 136
 137     data->rec_file = ci->open(data->filename, O_RDWR|O_CREAT|O_TRUNC, 0666);
 138
 139     if (data->rec_file < 0)
 140         return false;
 141
 142     /* reset sample count */
 143     data->num_pcm_samples = 0;
 144
 145     /* write template headers */
 146     if (ci->write(data->rec_file, &aiff_header, sizeof (aiff_header))
 147             != sizeof (aiff_header))
 148     {
 149         return false;
 150     }
 151
 152     data->new_enc_size += sizeof(aiff_header);
 153     return true;
 154 } /* on_start_file */
 155
 156 static bool on_end_file(struct enc_file_event_data *data)
 157 {
 158     /* update template headers */
 159     struct aiff_header hdr;
 160     uint32_t data_size;
 161
 162     if (!is_file_data_ok(data))
 163         return false;
 164
 165     if (ci->lseek(data->rec_file, 0, SEEK_SET) != 0 ||
 166         ci->read(data->rec_file, &hdr, sizeof (hdr)) != sizeof (hdr))
 167     {
 168         return false;
 169     }
 170
 171     data_size = data->num_pcm_samples*num_channels*PCM_DEPTH_BYTES;
 172
 173     /* 'FORM' chunk */
 174     hdr.form_size         = htobe32(data_size + sizeof (hdr) - 8);
 175
 176     /* 'COMM' chunk */
 177     hdr.num_channels      = htobe16(num_channels);
 178     hdr.num_sample_frames = htobe32(data->num_pcm_samples);
 179     uint32_h_to_ieee754_extended_be(hdr.sample_rate, sample_rate);
 180
 181     /* 'SSND' chunk */
 182     hdr.ssnd_size         = htobe32(data_size + 8);
 183
 184     if (ci->lseek(data->rec_file, 0, SEEK_SET) != 0 ||
 185         ci->write(data->rec_file, &hdr, sizeof (hdr)) != sizeof (hdr) ||
 186         ci->close(data->rec_file) != 0)
 187     {
 188         return false;
 189     }
 190
 191     data->rec_file = -1;
 192
 193     return true;
 194 } /* on_end_file */
 195
 196 STATICIRAM void enc_events_callback(enum enc_events event, void *data)
 197                                     ICODE_ATTR;
 198 STATICIRAM void enc_events_callback(enum enc_events event, void *data)
 199 {
 200     switch (event)
 201     {
 202     case ENC_WRITE_CHUNK:
 203         if (on_write_chunk((struct enc_file_event_data *)data))
 204             return;
 205
 206         break;
 207
 208     case ENC_START_FILE:
 209         if (on_start_file((struct enc_file_event_data *)data))
 210             return;
 211
 212         break;
 213
 214     case ENC_END_FILE:
 215         if (on_end_file((struct enc_file_event_data *)data))
 216             return;
 217
 218         break;
 219
 220     default:
 221         return;
 222     }
 223
 224     /* Something failed above. Signal error back to core. */
 225     ((struct enc_file_event_data *)data)->chunk->flags |= CHUNKF_ERROR;
 226 } /* enc_events_callback */
 227
 228 /* convert native pcm samples to aiff format samples */
 229 static inline void sample_to_mono(uint32_t **src, uint32_t **dst)
 230 {
 231     int32_t lr1, lr2;
 232
 233     switch(rec_mono_mode)
 234     {
 235         case 1:
 236             /* mono = L */
 237             lr1 = *(*src)++;
 238             lr1 = lr1 >> 16;
 239             lr2 = *(*src)++;
 240             lr2 = lr2 >> 16;
 241             break;
 242         case 2:
 243             /* mono = R */
 244             lr1 = *(*src)++;
 245             lr1 = (int16_t)lr1;
 246             lr2 = *(*src)++;
 247             lr2 = (int16_t)lr2;
 248             break;
 249         case 0:
 250         default:
 251             /* mono = (L+R)/2 */
 252             lr1 = *(*src)++;
 253             lr1 = (int16_t)lr1 + (lr1 >> 16) + err;
 254             err = lr1 & 1;
 255             lr1 >>= 1;
 256
 257             lr2 = *(*src)++;
 258             lr2 = (int16_t)lr2 + (lr2 >> 16) + err;
 259             err = lr2 & 1;
 260             lr2 >>= 1;
 261             break;
 262     }
 263     *(*dst)++ = htobe32((lr1 << 16) | (uint16_t)lr2);
 264 } /* sample_to_mono */
 265
 266 STATICIRAM void chunk_to_aiff_format(uint32_t *src, uint32_t *dst) ICODE_ATTR;
 267 STATICIRAM void chunk_to_aiff_format(uint32_t *src, uint32_t *dst)
 268 {
 269     if (num_channels == 1)
 270     {
 271         /* On big endian:
 272          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr|
 273          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr| =>
 274          *  |MMMMMMMMmmmmmmmm|MMMMMMMMmmmmmmmm|
 275          *
 276          * On little endian:
 277          *  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR|
 278          *  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR| =>
 279          *  |MMMMMMMMmmmmmmmm|MMMMMMMMmmmmmmmm|
 280          */
 281         uint32_t *src_end = src + PCM_SAMP_PER_CHUNK;
 282
 283         do
 284         {
 285             sample_to_mono(&src, &dst);
 286             sample_to_mono(&src, &dst);
 287             sample_to_mono(&src, &dst);
 288             sample_to_mono(&src, &dst);
 289             sample_to_mono(&src, &dst);
 290             sample_to_mono(&src, &dst);
 291             sample_to_mono(&src, &dst);
 292             sample_to_mono(&src, &dst);
 293         }
 294         while (src < src_end);
 295     }
 296     else
 297     {
 298 #ifdef ROCKBOX_BIG_ENDIAN
 299         /*  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr| =>
 300          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr|
 301          */
 302         ci->memcpy(dst, src, PCM_CHUNK_SIZE);
 303 #else
 304         /*  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR| =>
 305          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr|
 306          */
 307         uint32_t *src_end = src + PCM_SAMP_PER_CHUNK;
 308
 309         do
 310         {
 311             *dst++ = swap_odd_even32(*src++);
 312             *dst++ = swap_odd_even32(*src++);
 313             *dst++ = swap_odd_even32(*src++);
 314             *dst++ = swap_odd_even32(*src++);
 315             *dst++ = swap_odd_even32(*src++);
 316             *dst++ = swap_odd_even32(*src++);
 317             *dst++ = swap_odd_even32(*src++);
 318             *dst++ = swap_odd_even32(*src++);
 319         }
 320         while (src < src_end);
 321 #endif
 322     }
 323 } /* chunk_to_aiff_format */
 324
 325 static bool init_encoder(void)
 326 {
 327     struct enc_inputs     inputs;
 328     struct enc_parameters params;
 329
 330     if (ci->enc_get_inputs         == NULL ||
 331         ci->enc_set_parameters     == NULL ||
 332         ci->enc_get_chunk          == NULL ||
 333         ci->enc_finish_chunk       == NULL ||
 334         ci->enc_get_pcm_data       == NULL )
 335         return false;
 336
 337     ci->enc_get_inputs(&inputs);
 338
 339     if (inputs.config->afmt != AFMT_AIFF)
 340         return false;
 341
 342     sample_rate  = inputs.sample_rate;
 343     num_channels = inputs.num_channels;
 344     rec_mono_mode = inputs.rec_mono_mode;
 345     err          = 0;
 346
 347     /* configure the buffer system */
 348     params.afmt            = AFMT_AIFF;
 349     enc_size               = PCM_CHUNK_SIZE*inputs.num_channels / 2;
 350     params.chunk_size      = enc_size;
 351     params.enc_sample_rate = sample_rate;
 352     params.reserve_bytes   = 0;
 353     params.events_callback = enc_events_callback;
 354     ci->enc_set_parameters(&params);
 355
 356     return true;
 357 } /* init_encoder */
 358
 359 /* main codec entry point */
 360 enum codec_status codec_main(void)
 361 {
 362     if (!init_encoder())
 363     {
 364         ci->enc_codec_loaded = -1;
 365         return CODEC_ERROR;
 366     }
 367
 368     /* main application waits for this flag during encoder loading */
 369     ci->enc_codec_loaded = 1;
 370
 371     /* main encoding loop */
 372     while(!ci->stop_encoder)
 373     {
 374         uint32_t *src;
 375
 376         while ((src = (uint32_t *)ci->enc_get_pcm_data(PCM_CHUNK_SIZE)) != NULL)
 377         {
 378             struct enc_chunk_hdr *chunk;
 379
 380             if (ci->stop_encoder)
 381                 break;
 382
 383             chunk           = ci->enc_get_chunk();
 384             chunk->enc_size = enc_size;
 385             chunk->num_pcm  = PCM_SAMP_PER_CHUNK;
 386             chunk->enc_data = ENC_CHUNK_SKIP_HDR(chunk->enc_data, chunk);
 387
 388             chunk_to_aiff_format(src, (uint32_t *)chunk->enc_data);
 389
 390             ci->enc_finish_chunk();
 391             ci->yield();
 392         }
 393
 394         ci->yield();
 395     }
 396
 397     /* reset parameters to initial state */
 398     ci->enc_set_parameters(NULL);
 399
 400     /* main application waits for this flag during encoder removing */
 401     ci->enc_codec_loaded = 0;
 402
 403     return CODEC_OK;
 404 } /* codec_start */