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 #ifndef SIMULATOR
  23
  24 #include <inttypes.h>
  25 #include "codeclib.h"
  26
  27 CODEC_ENC_HEADER
  28
  29 struct aiff_header
  30 {
  31     uint8_t   form_id[4];           /* 00h - 'FORM'                          */
  32     uint32_t  form_size;            /* 04h - size of file - 8                */
  33     uint8_t   aiff_id[4];           /* 08h - 'AIFF'                          */
  34     uint8_t   comm_id[4];           /* 0Ch - 'COMM'                          */
  35     int32_t   comm_size;            /* 10h - num_channels through sample_rate
  36                                              (18)                            */
  37     int16_t   num_channels;         /* 14h - 1=M, 2=S, etc.                  */
  38     uint32_t  num_sample_frames;    /* 16h - num samples for each channel    */
  39     int16_t   sample_size;          /* 1ah - 1-32 bits per sample            */
  40     uint8_t   sample_rate[10];      /* 1ch - IEEE 754 80-bit floating point  */
  41     uint8_t   ssnd_id[4];           /* 26h - "SSND"                          */
  42     int32_t   ssnd_size;            /* 2ah - size of chunk from offset to
  43                                              end of pcm data                 */
  44     uint32_t  offset;               /* 2eh - data offset from end of header  */
  45     uint32_t  block_size;           /* 32h - pcm data alignment              */
  46                                     /* 36h */
  47 } __attribute__((packed));
  48
  49 #define PCM_DEPTH_BYTES             2
  50 #define PCM_DEPTH_BITS             16
  51 #define PCM_SAMP_PER_CHUNK       2048
  52 #define PCM_CHUNK_SIZE          (PCM_SAMP_PER_CHUNK*4)
  53
  54 /* Template headers */
  55 struct aiff_header aiff_header =
  56 {
  57     { 'F', 'O', 'R', 'M' },             /* form_id               */
  58     0,                                  /* form_size         (*) */
  59     { 'A', 'I', 'F', 'F' },             /* aiff_id               */
  60     { 'C', 'O', 'M', 'M' },             /* comm_id               */
  61     H_TO_BE32(18),                      /* comm_size             */
  62     0,                                  /* num_channels      (*) */
  63     0,                                  /* num_sample_frames (*) */
  64     H_TO_BE16(PCM_DEPTH_BITS),          /* sample_size           */
  65     { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },   /* sample_rate       (*) */
  66     { 'S', 'S', 'N', 'D' },             /* ssnd_id               */
  67     0,                                  /* ssnd_size         (*) */
  68     H_TO_BE32(0),                       /* offset                */
  69     H_TO_BE32(0),                       /* block_size            */
  70 };
  71
  72 /* (*) updated when finalizing file */
  73
  74 static int      num_channels IBSS_ATTR;
  75 static int      rec_mono_mode IBSS_ATTR;
  76 static uint32_t sample_rate;
  77 static uint32_t enc_size;
  78 static int32_t  err          IBSS_ATTR;
  79
  80 /* convert unsigned 32 bit value to 80-bit floating point number */
  81 STATICIRAM void uint32_h_to_ieee754_extended_be(uint8_t f[10], uint32_t l)
  82                                                 ICODE_ATTR;
  83 STATICIRAM void uint32_h_to_ieee754_extended_be(uint8_t f[10], uint32_t l)
  84 {
  85     int32_t exp;
  86
  87     ci->memset(f, 0, 10);
  88
  89     if (l == 0)
  90         return;
  91
  92     for (exp = 30; (l & (1ul << 31)) == 0; exp--)
  93         l <<= 1;
  94
  95     /* sign always zero - bit 79 */
  96     /* exponent is 0-31 (normalized: 31 - shift + 16383) - bits 64-78 */
  97     f[0] = 0x40;
  98     f[1] = (uint8_t)exp;
  99     /* mantissa is value left justified with most significant non-zero
 100        bit stored in bit 63 - bits 0-63 */
 101     *(uint32_t *)&f[2] = htobe32(l);
 102 } /* uint32_h_to_ieee754_extended_be */
 103
 104 /* called version often - inline */
 105 static inline bool is_file_data_ok(struct enc_file_event_data *data) ICODE_ATTR;
 106 static inline bool is_file_data_ok(struct enc_file_event_data *data)
 107 {
 108     return data->rec_file >= 0 && (long)data->chunk->flags >= 0;
 109 } /* is_file_data_ok */
 110
 111 /* called version often - inline */
 112 static inline bool on_write_chunk(struct enc_file_event_data *data) ICODE_ATTR;
 113 static inline bool on_write_chunk(struct enc_file_event_data *data)
 114 {
 115     if (!is_file_data_ok(data))
 116         return false;
 117
 118     if (data->chunk->enc_data == NULL)
 119     {
 120 #ifdef ROCKBOX_HAS_LOGF
 121         ci->logf("aiff enc: NULL data");
 122 #endif
 123         return true;
 124     }
 125
 126     if (ci->write(data->rec_file, data->chunk->enc_data,
 127                   data->chunk->enc_size) != (ssize_t)data->chunk->enc_size)
 128         return false;
 129
 130     data->num_pcm_samples += data->chunk->num_pcm;
 131     return true;
 132 } /* on_write_chunk */
 133
 134 static bool on_start_file(struct enc_file_event_data *data)
 135 {
 136     if ((data->chunk->flags & CHUNKF_ERROR) || *data->filename == '\0')
 137         return false;
 138
 139     data->rec_file = ci->open(data->filename, O_RDWR|O_CREAT|O_TRUNC);
 140
 141     if (data->rec_file < 0)
 142         return false;
 143
 144     /* reset sample count */
 145     data->num_pcm_samples = 0;
 146
 147     /* write template headers */
 148     if (ci->write(data->rec_file, &aiff_header, sizeof (aiff_header))
 149             != sizeof (aiff_header))
 150     {
 151         return false;
 152     }
 153
 154     data->new_enc_size += sizeof(aiff_header);
 155     return true;
 156 } /* on_start_file */
 157
 158 static bool on_end_file(struct enc_file_event_data *data)
 159 {
 160     /* update template headers */
 161     struct aiff_header hdr;
 162     uint32_t data_size;
 163
 164     if (!is_file_data_ok(data))
 165         return false;
 166
 167     if (ci->lseek(data->rec_file, 0, SEEK_SET) != 0 ||
 168         ci->read(data->rec_file, &hdr, sizeof (hdr)) != sizeof (hdr))
 169     {
 170         return false;
 171     }
 172
 173     data_size = data->num_pcm_samples*num_channels*PCM_DEPTH_BYTES;
 174
 175     /* 'FORM' chunk */
 176     hdr.form_size         = htobe32(data_size + sizeof (hdr) - 8);
 177
 178     /* 'COMM' chunk */
 179     hdr.num_channels      = htobe16(num_channels);
 180     hdr.num_sample_frames = htobe32(data->num_pcm_samples);
 181     uint32_h_to_ieee754_extended_be(hdr.sample_rate, sample_rate);
 182
 183     /* 'SSND' chunk */
 184     hdr.ssnd_size         = htobe32(data_size + 8);
 185
 186     if (ci->lseek(data->rec_file, 0, SEEK_SET) != 0 ||
 187         ci->write(data->rec_file, &hdr, sizeof (hdr)) != sizeof (hdr) ||
 188         ci->close(data->rec_file) != 0)
 189     {
 190         return false;
 191     }
 192
 193     data->rec_file = -1;
 194
 195     return true;
 196 } /* on_end_file */
 197
 198 STATICIRAM void enc_events_callback(enum enc_events event, void *data)
 199                                     ICODE_ATTR;
 200 STATICIRAM void enc_events_callback(enum enc_events event, void *data)
 201 {
 202     switch (event)
 203     {
 204     case ENC_WRITE_CHUNK:
 205         if (on_write_chunk((struct enc_file_event_data *)data))
 206             return;
 207
 208         break;
 209
 210     case ENC_START_FILE:
 211         if (on_start_file((struct enc_file_event_data *)data))
 212             return;
 213
 214         break;
 215
 216     case ENC_END_FILE:
 217         if (on_end_file((struct enc_file_event_data *)data))
 218             return;
 219
 220         break;
 221
 222     default:
 223         return;
 224     }
 225
 226     /* Something failed above. Signal error back to core. */
 227     ((struct enc_file_event_data *)data)->chunk->flags |= CHUNKF_ERROR;
 228 } /* enc_events_callback */
 229
 230 /* convert native pcm samples to aiff format samples */
 231 static inline void sample_to_mono(uint32_t **src, uint32_t **dst)
 232 {
 233     int32_t lr1, lr2;
 234
 235     switch(rec_mono_mode)
 236     {
 237         case 1:
 238             /* mono = L */
 239             lr1 = *(*src)++;
 240             lr1 = lr1 >> 16;
 241             lr2 = *(*src)++;
 242             lr2 = lr2 >> 16;
 243             break;
 244         case 2:
 245             /* mono = R */
 246             lr1 = *(*src)++;
 247             lr1 = (int16_t)lr1;
 248             lr2 = *(*src)++;
 249             lr2 = (int16_t)lr2;
 250             break;
 251         case 0:
 252         default:
 253             /* mono = (L+R)/2 */
 254             lr1 = *(*src)++;
 255             lr1 = (int16_t)lr1 + (lr1 >> 16) + err;
 256             err = lr1 & 1;
 257             lr1 >>= 1;
 258
 259             lr2 = *(*src)++;
 260             lr2 = (int16_t)lr2 + (lr2 >> 16) + err;
 261             err = lr2 & 1;
 262             lr2 >>= 1;
 263             break;
 264     }
 265     *(*dst)++ = htobe32((lr1 << 16) | (uint16_t)lr2);
 266 } /* sample_to_mono */
 267
 268 STATICIRAM void chunk_to_aiff_format(uint32_t *src, uint32_t *dst) ICODE_ATTR;
 269 STATICIRAM void chunk_to_aiff_format(uint32_t *src, uint32_t *dst)
 270 {
 271     if (num_channels == 1)
 272     {
 273         /* On big endian:
 274          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr|
 275          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr| =>
 276          *  |MMMMMMMMmmmmmmmm|MMMMMMMMmmmmmmmm|
 277          *
 278          * On little endian:
 279          *  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR|
 280          *  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR| =>
 281          *  |MMMMMMMMmmmmmmmm|MMMMMMMMmmmmmmmm|
 282          */
 283         uint32_t *src_end = src + PCM_SAMP_PER_CHUNK;
 284
 285         do
 286         {
 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             sample_to_mono(&src, &dst);
 294             sample_to_mono(&src, &dst);
 295         }
 296         while (src < src_end);
 297     }
 298     else
 299     {
 300 #ifdef ROCKBOX_BIG_ENDIAN
 301         /*  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr| =>
 302          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr|
 303          */
 304         ci->memcpy(dst, src, PCM_CHUNK_SIZE);
 305 #else
 306         /*  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR| =>
 307          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr|
 308          */
 309         uint32_t *src_end = src + PCM_SAMP_PER_CHUNK;
 310
 311         do
 312         {
 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             *dst++ = swap_odd_even32(*src++);
 320             *dst++ = swap_odd_even32(*src++);
 321         }
 322         while (src < src_end);
 323 #endif
 324     }
 325 } /* chunk_to_aiff_format */
 326
 327 static bool init_encoder(void)
 328 {
 329     struct enc_inputs     inputs;
 330     struct enc_parameters params;
 331
 332     if (ci->enc_get_inputs         == NULL ||
 333         ci->enc_set_parameters     == NULL ||
 334         ci->enc_get_chunk          == NULL ||
 335         ci->enc_finish_chunk       == NULL ||
 336         ci->enc_get_pcm_data       == NULL )
 337         return false;
 338
 339     ci->enc_get_inputs(&inputs);
 340
 341     if (inputs.config->afmt != AFMT_AIFF)
 342         return false;
 343
 344     sample_rate  = inputs.sample_rate;
 345     num_channels = inputs.num_channels;
 346     rec_mono_mode = inputs.rec_mono_mode;
 347     err          = 0;
 348
 349     /* configure the buffer system */
 350     params.afmt            = AFMT_AIFF;
 351     enc_size               = PCM_CHUNK_SIZE*inputs.num_channels / 2;
 352     params.chunk_size      = enc_size;
 353     params.enc_sample_rate = sample_rate;
 354     params.reserve_bytes   = 0;
 355     params.events_callback = enc_events_callback;
 356     ci->enc_set_parameters(&params);
 357
 358     return true;
 359 } /* init_encoder */
 360
 361 /* main codec entry point */
 362 enum codec_status codec_main(void)
 363 {
 364     if (!init_encoder())
 365     {
 366         ci->enc_codec_loaded = -1;
 367         return CODEC_ERROR;
 368     }
 369
 370     /* main application waits for this flag during encoder loading */
 371     ci->enc_codec_loaded = 1;
 372
 373     /* main encoding loop */
 374     while(!ci->stop_encoder)
 375     {
 376         uint32_t *src;
 377
 378         while ((src = (uint32_t *)ci->enc_get_pcm_data(PCM_CHUNK_SIZE)) != NULL)
 379         {
 380             struct enc_chunk_hdr *chunk;
 381
 382             if (ci->stop_encoder)
 383                 break;
 384
 385             chunk           = ci->enc_get_chunk();
 386             chunk->enc_size = enc_size;
 387             chunk->num_pcm  = PCM_SAMP_PER_CHUNK;
 388             chunk->enc_data = ENC_CHUNK_SKIP_HDR(chunk->enc_data, chunk);
 389
 390             chunk_to_aiff_format(src, (uint32_t *)chunk->enc_data);
 391
 392             ci->enc_finish_chunk();
 393             ci->yield();
 394         }
 395
 396         ci->yield();
 397     }
 398
 399     /* reset parameters to initial state */
 400     ci->enc_set_parameters(NULL);
 401
 402     /* main application waits for this flag during encoder removing */
 403     ci->enc_codec_loaded = 0;
 404
 405     return CODEC_OK;
 406 } /* codec_start */
 407
 408 #endif /* ndef SIMULATOR */