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     htobe32(18),                        /* comm_size             */
  60     0,                                  /* num_channels      (*) */
  61     0,                                  /* num_sample_frames (*) */
  62     htobe16(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     htobe32(0),                         /* offset                */
  67     htobe32(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     f[2] = (uint8_t)(l >> 24);
 100     f[3] = (uint8_t)(l >> 16);
 101     f[4] = (uint8_t)(l >>  8);
 102     f[5] = (uint8_t)(l >>  0);
 103 } /* uint32_h_to_ieee754_extended_be */
 104
 105 /* called version often - inline */
 106 static inline bool is_file_data_ok(struct enc_file_event_data *data) ICODE_ATTR;
 107 static inline bool is_file_data_ok(struct enc_file_event_data *data)
 108 {
 109     return data->rec_file >= 0 && (long)data->chunk->flags >= 0;
 110 } /* is_file_data_ok */
 111
 112 /* called version often - inline */
 113 static inline bool on_write_chunk(struct enc_file_event_data *data) ICODE_ATTR;
 114 static inline bool on_write_chunk(struct enc_file_event_data *data)
 115 {
 116     if (!is_file_data_ok(data))
 117         return false;
 118
 119     if (data->chunk->enc_data == NULL)
 120     {
 121 #ifdef ROCKBOX_HAS_LOGF
 122         ci->logf("aiff enc: NULL data");
 123 #endif
 124         return true;
 125     }
 126
 127     if (ci->write(data->rec_file, data->chunk->enc_data,
 128                   data->chunk->enc_size) != (ssize_t)data->chunk->enc_size)
 129         return false;
 130
 131     data->num_pcm_samples += data->chunk->num_pcm;
 132     return true;
 133 } /* on_write_chunk */
 134
 135 static bool on_start_file(struct enc_file_event_data *data)
 136 {
 137     if ((data->chunk->flags & CHUNKF_ERROR) || *data->filename == '\0')
 138         return false;
 139
 140     data->rec_file = ci->open(data->filename, O_RDWR|O_CREAT|O_TRUNC, 0666);
 141
 142     if (data->rec_file < 0)
 143         return false;
 144
 145     /* reset sample count */
 146     data->num_pcm_samples = 0;
 147
 148     /* write template headers */
 149     if (ci->write(data->rec_file, &aiff_header, sizeof (aiff_header))
 150             != sizeof (aiff_header))
 151     {
 152         return false;
 153     }
 154
 155     data->new_enc_size += sizeof(aiff_header);
 156     return true;
 157 } /* on_start_file */
 158
 159 static bool on_end_file(struct enc_file_event_data *data)
 160 {
 161     /* update template headers */
 162     struct aiff_header hdr;
 163     uint32_t data_size;
 164
 165     if (!is_file_data_ok(data))
 166         return false;
 167
 168     if (ci->lseek(data->rec_file, 0, SEEK_SET) != 0 ||
 169         ci->read(data->rec_file, &hdr, sizeof (hdr)) != sizeof (hdr))
 170     {
 171         return false;
 172     }
 173
 174     data_size = data->num_pcm_samples*num_channels*PCM_DEPTH_BYTES;
 175
 176     /* 'FORM' chunk */
 177     hdr.form_size         = htobe32(data_size + sizeof (hdr) - 8);
 178
 179     /* 'COMM' chunk */
 180     hdr.num_channels      = htobe16(num_channels);
 181     hdr.num_sample_frames = htobe32(data->num_pcm_samples);
 182     uint32_h_to_ieee754_extended_be(hdr.sample_rate, sample_rate);
 183
 184     /* 'SSND' chunk */
 185     hdr.ssnd_size         = htobe32(data_size + 8);
 186
 187     if (ci->lseek(data->rec_file, 0, SEEK_SET) != 0 ||
 188         ci->write(data->rec_file, &hdr, sizeof (hdr)) != sizeof (hdr) ||
 189         ci->close(data->rec_file) != 0)
 190     {
 191         return false;
 192     }
 193
 194     data->rec_file = -1;
 195
 196     return true;
 197 } /* on_end_file */
 198
 199 STATICIRAM void enc_events_callback(enum enc_events event, void *data)
 200                                     ICODE_ATTR;
 201 STATICIRAM void enc_events_callback(enum enc_events event, void *data)
 202 {
 203     switch (event)
 204     {
 205     case ENC_WRITE_CHUNK:
 206         if (on_write_chunk((struct enc_file_event_data *)data))
 207             return;
 208
 209         break;
 210
 211     case ENC_START_FILE:
 212         if (on_start_file((struct enc_file_event_data *)data))
 213             return;
 214
 215         break;
 216
 217     case ENC_END_FILE:
 218         if (on_end_file((struct enc_file_event_data *)data))
 219             return;
 220
 221         break;
 222
 223     default:
 224         return;
 225     }
 226
 227     /* Something failed above. Signal error back to core. */
 228     ((struct enc_file_event_data *)data)->chunk->flags |= CHUNKF_ERROR;
 229 } /* enc_events_callback */
 230
 231 /* convert native pcm samples to aiff format samples */
 232 static inline void sample_to_mono(uint32_t **src, uint32_t **dst)
 233 {
 234     int32_t lr1, lr2;
 235
 236     switch(rec_mono_mode)
 237     {
 238         case 1:
 239             /* mono = L */
 240             lr1 = *(*src)++;
 241             lr1 = lr1 >> 16;
 242             lr2 = *(*src)++;
 243             lr2 = lr2 >> 16;
 244             break;
 245         case 2:
 246             /* mono = R */
 247             lr1 = *(*src)++;
 248             lr1 = (int16_t)lr1;
 249             lr2 = *(*src)++;
 250             lr2 = (int16_t)lr2;
 251             break;
 252         case 0:
 253         default:
 254             /* mono = (L+R)/2 */
 255             lr1 = *(*src)++;
 256             lr1 = (int16_t)lr1 + (lr1 >> 16) + err;
 257             err = lr1 & 1;
 258             lr1 >>= 1;
 259
 260             lr2 = *(*src)++;
 261             lr2 = (int16_t)lr2 + (lr2 >> 16) + err;
 262             err = lr2 & 1;
 263             lr2 >>= 1;
 264             break;
 265     }
 266     *(*dst)++ = htobe32((lr1 << 16) | (uint16_t)lr2);
 267 } /* sample_to_mono */
 268
 269 STATICIRAM void chunk_to_aiff_format(uint32_t *src, uint32_t *dst) ICODE_ATTR;
 270 STATICIRAM void chunk_to_aiff_format(uint32_t *src, uint32_t *dst)
 271 {
 272     if (num_channels == 1)
 273     {
 274         /* On big endian:
 275          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr|
 276          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr| =>
 277          *  |MMMMMMMMmmmmmmmm|MMMMMMMMmmmmmmmm|
 278          *
 279          * On little endian:
 280          *  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR|
 281          *  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR| =>
 282          *  |MMMMMMMMmmmmmmmm|MMMMMMMMmmmmmmmm|
 283          */
 284         uint32_t *src_end = src + PCM_SAMP_PER_CHUNK;
 285
 286         do
 287         {
 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             sample_to_mono(&src, &dst);
 296         }
 297         while (src < src_end);
 298     }
 299     else
 300     {
 301 #ifdef ROCKBOX_BIG_ENDIAN
 302         /*  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr| =>
 303          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr|
 304          */
 305         ci->memcpy(dst, src, PCM_CHUNK_SIZE);
 306 #else
 307         /*  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR| =>
 308          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr|
 309          */
 310         uint32_t *src_end = src + PCM_SAMP_PER_CHUNK;
 311
 312         do
 313         {
 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             *dst++ = swap_odd_even32(*src++);
 322         }
 323         while (src < src_end);
 324 #endif
 325     }
 326 } /* chunk_to_aiff_format */
 327
 328 static bool init_encoder(void)
 329 {
 330     struct enc_inputs     inputs;
 331     struct enc_parameters params;
 332
 333     if (ci->enc_get_inputs         == NULL ||
 334         ci->enc_set_parameters     == NULL ||
 335         ci->enc_get_chunk          == NULL ||
 336         ci->enc_finish_chunk       == NULL ||
 337         ci->enc_get_pcm_data       == NULL )
 338         return false;
 339
 340     ci->enc_get_inputs(&inputs);
 341
 342     if (inputs.config->afmt != AFMT_AIFF)
 343         return false;
 344
 345     sample_rate  = inputs.sample_rate;
 346     num_channels = inputs.num_channels;
 347     rec_mono_mode = inputs.rec_mono_mode;
 348     err          = 0;
 349
 350     /* configure the buffer system */
 351     params.afmt            = AFMT_AIFF;
 352     enc_size               = PCM_CHUNK_SIZE*inputs.num_channels / 2;
 353     params.chunk_size      = enc_size;
 354     params.enc_sample_rate = sample_rate;
 355     params.reserve_bytes   = 0;
 356     params.events_callback = enc_events_callback;
 357     ci->enc_set_parameters(&params);
 358
 359     return true;
 360 } /* init_encoder */
 361
 362 /* main codec entry point */
 363 enum codec_status codec_main(void)
 364 {
 365     if (!init_encoder())
 366         return CODEC_ERROR;
 367
 368     /* main encoding loop */
 369     while(!ci->stop_codec)
 370     {
 371         uint32_t *src;
 372
 373         while ((src = (uint32_t *)ci->enc_get_pcm_data(PCM_CHUNK_SIZE)) != NULL)
 374         {
 375             struct enc_chunk_hdr *chunk;
 376
 377             if (ci->stop_codec)
 378                 break;
 379
 380             chunk           = ci->enc_get_chunk();
 381             chunk->enc_size = enc_size;
 382             chunk->num_pcm  = PCM_SAMP_PER_CHUNK;
 383             chunk->enc_data = ENC_CHUNK_SKIP_HDR(chunk->enc_data, chunk);
 384
 385             chunk_to_aiff_format(src, (uint32_t *)chunk->enc_data);
 386
 387             ci->enc_finish_chunk();
 388             ci->yield();
 389         }
 390
 391         ci->yield();
 392     }
 393
 394     /* reset parameters to initial state */
 395     ci->enc_set_parameters(NULL);
 396
 397     return CODEC_OK;
 398 } /* codec_start */