apps/codecs/wav_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 riff_header
  28 {
  29     uint8_t  riff_id[4];      /* 00h - "RIFF"                            */
  30     uint32_t riff_size;       /* 04h - sz following headers + data_size  */
  31     /* format header */
  32     uint8_t  format[4];       /* 08h - "WAVE"                            */
  33     uint8_t  format_id[4];    /* 0Ch - "fmt "                            */
  34     uint32_t format_size;     /* 10h - 16 for PCM (sz format data)       */
  35     /* format data */
  36     uint16_t audio_format;    /* 14h - 1=PCM                             */
  37     uint16_t num_channels;    /* 16h - 1=M, 2=S, etc.                    */
  38     uint32_t sample_rate;     /* 18h - HZ                                */
  39     uint32_t byte_rate;       /* 1Ch - num_channels*sample_rate*bits_per_sample/8 */
  40     uint16_t block_align;     /* 20h - num_channels*bits_per_samples/8   */
  41     uint16_t bits_per_sample; /* 22h - 8=8 bits, 16=16 bits, etc.        */
  42     /* Not for audio_format=1 (PCM) */
  43 /*  unsigned short extra_param_size;   24h - size of extra data          */
  44 /*  unsigned char  *extra_params; */
  45     /* data header */
  46     uint8_t  data_id[4];      /* 24h - "data" */
  47     uint32_t data_size;       /* 28h - num_samples*num_channels*bits_per_sample/8 */
  48 /*  unsigned char  *data;              2ch - actual sound data */
  49 } __attribute__((packed));
  50
  51 #define RIFF_FMT_HEADER_SIZE       12 /* format -> format_size */
  52 #define RIFF_FMT_DATA_SIZE         16 /* audio_format -> bits_per_sample */
  53 #define RIFF_DATA_HEADER_SIZE       8 /* data_id -> data_size */
  54
  55 #define PCM_DEPTH_BYTES             2
  56 #define PCM_DEPTH_BITS             16
  57 #define PCM_SAMP_PER_CHUNK       2048
  58 #define PCM_CHUNK_SIZE          (PCM_SAMP_PER_CHUNK*4)
  59
  60 static int      num_channels IBSS_ATTR;
  61 static int      rec_mono_mode IBSS_ATTR;
  62 static uint32_t sample_rate;
  63 static uint32_t enc_size;
  64 static int32_t  err          IBSS_ATTR;
  65
  66 static const struct riff_header riff_header =
  67 {
  68     /* "RIFF" header */
  69     { 'R', 'I', 'F', 'F' },         /* riff_id          */
  70     0,                              /* riff_size   (*)  */
  71     /* format header */
  72     { 'W', 'A', 'V', 'E' },         /* format           */
  73     { 'f', 'm', 't', ' ' },         /* format_id        */
  74     H_TO_LE32(16),                  /* format_size      */
  75     /* format data */
  76     H_TO_LE16(1),                   /* audio_format     */
  77     0,                              /* num_channels (*) */
  78     0,                              /* sample_rate  (*) */
  79     0,                              /* byte_rate    (*) */
  80     0,                              /* block_align  (*) */
  81     H_TO_LE16(PCM_DEPTH_BITS),      /* bits_per_sample  */
  82     /* data header */
  83     { 'd', 'a', 't', 'a' },         /* data_id          */
  84     0                               /* data_size    (*) */
  85     /* (*) updated during ENC_END_FILE event */
  86 };
  87
  88 /* called version often - inline */
  89 static inline bool is_file_data_ok(struct enc_file_event_data *data) ICODE_ATTR;
  90 static inline bool is_file_data_ok(struct enc_file_event_data *data)
  91 {
  92     return data->rec_file >= 0 && (long)data->chunk->flags >= 0;
  93 } /* is_file_data_ok */
  94
  95 /* called version often - inline */
  96 static inline bool on_write_chunk(struct enc_file_event_data *data) ICODE_ATTR;
  97 static inline bool on_write_chunk(struct enc_file_event_data *data)
  98 {
  99     if (!is_file_data_ok(data))
 100         return false;
 101
 102     if (data->chunk->enc_data == NULL)
 103     {
 104 #ifdef ROCKBOX_HAS_LOGF
 105         ci->logf("wav enc: NULL data");
 106 #endif
 107         return true;
 108     }
 109
 110     if (ci->write(data->rec_file, data->chunk->enc_data,
 111                   data->chunk->enc_size) != (ssize_t)data->chunk->enc_size)
 112         return false;
 113
 114     data->num_pcm_samples += data->chunk->num_pcm;
 115     return true;
 116 } /* on_write_chunk */
 117
 118 static bool on_start_file(struct enc_file_event_data *data)
 119 {
 120     if ((data->chunk->flags & CHUNKF_ERROR) || *data->filename == '\0')
 121         return false;
 122
 123     data->rec_file = ci->open(data->filename, O_RDWR|O_CREAT|O_TRUNC, 0666);
 124
 125     if (data->rec_file < 0)
 126         return false;
 127
 128     /* reset sample count */
 129     data->num_pcm_samples = 0;
 130
 131     /* write template header */
 132     if (ci->write(data->rec_file, &riff_header, sizeof (riff_header))
 133             != sizeof (riff_header))
 134     {
 135         return false;
 136     }
 137
 138     data->new_enc_size += sizeof (riff_header);
 139     return true;
 140 } /* on_start_file */
 141
 142 static bool on_end_file(struct enc_file_event_data *data)
 143 {
 144     /* update template header */
 145     struct riff_header hdr;
 146     uint32_t data_size;
 147
 148     if (data->rec_file < 0)
 149         return false; /* file already closed, nothing more we can do */
 150
 151     /* always _try_ to write the file header, even on error */
 152     if ((ci->lseek(data->rec_file, 0, SEEK_SET)) ||
 153         (ci->read(data->rec_file, &hdr, sizeof (hdr)) != sizeof (hdr)))
 154     {
 155         return false;
 156     }
 157
 158     data_size = data->num_pcm_samples*num_channels*PCM_DEPTH_BYTES;
 159
 160     /* "RIFF" header */
 161     hdr.riff_size    = htole32(RIFF_FMT_HEADER_SIZE + RIFF_FMT_DATA_SIZE
 162                                + RIFF_DATA_HEADER_SIZE + data_size);
 163
 164     /* format data */
 165     hdr.num_channels = htole16(num_channels);
 166     hdr.sample_rate  = htole32(sample_rate);
 167     hdr.byte_rate    = htole32(sample_rate*num_channels* PCM_DEPTH_BYTES);
 168     hdr.block_align  = htole16(num_channels*PCM_DEPTH_BYTES);
 169
 170     /* data header */
 171     hdr.data_size    = htole32(data_size);
 172
 173     if (ci->lseek(data->rec_file, 0, SEEK_SET) != 0 ||
 174         ci->write(data->rec_file, &hdr, sizeof (hdr)) != sizeof (hdr) ||
 175         ci->close(data->rec_file) != 0)
 176     {
 177         return false;
 178     }
 179
 180     data->rec_file = -1;
 181
 182     return true;
 183 } /* on_end_file */
 184
 185 STATICIRAM void enc_events_callback(enum enc_events event, void *data)
 186                                     ICODE_ATTR;
 187 STATICIRAM void enc_events_callback(enum enc_events event, void *data)
 188 {
 189     switch (event)
 190     {
 191     case ENC_WRITE_CHUNK:
 192         if (on_write_chunk((struct enc_file_event_data *)data))
 193             return;
 194
 195         break;
 196
 197     case ENC_START_FILE:
 198         if (on_start_file((struct enc_file_event_data *)data))
 199             return;
 200
 201         break;
 202
 203     case ENC_END_FILE:
 204         if (on_end_file((struct enc_file_event_data *)data))
 205             return;
 206
 207         break;
 208
 209     default:
 210         return;
 211     }
 212
 213     /* Something failed above. Signal error back to core. */
 214     ((struct enc_file_event_data *)data)->chunk->flags |= CHUNKF_ERROR;
 215 } /* enc_events_callback */
 216
 217 /* convert native pcm samples to wav format samples */
 218 static inline void sample_to_mono(uint32_t **src, uint32_t **dst)
 219 {
 220     int32_t lr1, lr2;
 221
 222     switch(rec_mono_mode)
 223     {
 224         case 1:
 225             /* mono = L */
 226             lr1 = *(*src)++;
 227             lr1 = lr1 >> 16;
 228             lr2 = *(*src)++;
 229             lr2 = lr2 >> 16;
 230             break;
 231         case 2:
 232             /* mono = R */
 233             lr1 = *(*src)++;
 234             lr1 = (uint16_t)lr1;
 235             lr2 = *(*src)++;
 236             lr2 = (uint16_t)lr2;
 237             break;
 238         case 0:
 239         default:
 240             /* mono = (L+R)/2 */
 241             lr1 = *(*src)++;
 242             lr1 = (int16_t)lr1 + (lr1 >> 16) + err;
 243             err = lr1 & 1;
 244             lr1 >>= 1;
 245
 246             lr2 = *(*src)++;
 247             lr2 = (int16_t)lr2 + (lr2 >> 16) + err;
 248             err = lr2 & 1;
 249             lr2 >>= 1;
 250             break;
 251     }
 252     *(*dst)++ = htole32((lr2 << 16) | (uint16_t)lr1);
 253 } /* sample_to_mono */
 254
 255 STATICIRAM void chunk_to_wav_format(uint32_t *src, uint32_t *dst) ICODE_ATTR;
 256 STATICIRAM void chunk_to_wav_format(uint32_t *src, uint32_t *dst)
 257 {
 258     if (num_channels == 1)
 259     {
 260         /* On big endian:
 261          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr|
 262          *  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr| =>
 263          *  |mmmmmmmmMMMMMMMM|mmmmmmmmMMMMMMMM|
 264          *
 265          * On little endian:
 266          *  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR|
 267          *  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR| =>
 268          *  |mmmmmmmmMMMMMMMM|mmmmmmmmMMMMMMMM|
 269          */
 270         uint32_t *src_end = src + PCM_SAMP_PER_CHUNK;
 271
 272         do
 273         {
 274             sample_to_mono(&src, &dst);
 275             sample_to_mono(&src, &dst);
 276             sample_to_mono(&src, &dst);
 277             sample_to_mono(&src, &dst);
 278             sample_to_mono(&src, &dst);
 279             sample_to_mono(&src, &dst);
 280             sample_to_mono(&src, &dst);
 281             sample_to_mono(&src, &dst);
 282         }
 283         while (src < src_end);
 284     }
 285     else
 286     {
 287 #ifdef ROCKBOX_BIG_ENDIAN
 288         /*  |LLLLLLLLllllllll|RRRRRRRRrrrrrrrr| =>
 289          *  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR|
 290          */
 291         uint32_t *src_end = src + PCM_SAMP_PER_CHUNK;
 292
 293         do
 294         {
 295             *dst++ = swap_odd_even32(*src++);
 296             *dst++ = swap_odd_even32(*src++);
 297             *dst++ = swap_odd_even32(*src++);
 298             *dst++ = swap_odd_even32(*src++);
 299             *dst++ = swap_odd_even32(*src++);
 300             *dst++ = swap_odd_even32(*src++);
 301             *dst++ = swap_odd_even32(*src++);
 302             *dst++ = swap_odd_even32(*src++);
 303         }
 304         while (src < src_end);
 305 #else
 306         /*  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR| =>
 307          *  |llllllllLLLLLLLL|rrrrrrrrRRRRRRRR|
 308          */
 309         ci->memcpy(dst, src, PCM_CHUNK_SIZE);
 310 #endif
 311     }
 312 } /* chunk_to_wav_format */
 313
 314 static bool init_encoder(void)
 315 {
 316     struct enc_inputs     inputs;
 317     struct enc_parameters params;
 318
 319     if (ci->enc_get_inputs         == NULL ||
 320         ci->enc_set_parameters     == NULL ||
 321         ci->enc_get_chunk          == NULL ||
 322         ci->enc_finish_chunk       == NULL ||
 323         ci->enc_get_pcm_data       == NULL )
 324         return false;
 325
 326     ci->enc_get_inputs(&inputs);
 327
 328     if (inputs.config->afmt != AFMT_PCM_WAV)
 329         return false;
 330
 331     sample_rate  = inputs.sample_rate;
 332     num_channels = inputs.num_channels;
 333     rec_mono_mode = inputs.rec_mono_mode;
 334     err          = 0;
 335
 336     /* configure the buffer system */
 337     params.afmt            = AFMT_PCM_WAV;
 338     enc_size               = PCM_CHUNK_SIZE*inputs.num_channels / 2;
 339     params.chunk_size      = enc_size;
 340     params.enc_sample_rate = sample_rate;
 341     params.reserve_bytes   = 0;
 342     params.events_callback = enc_events_callback;
 343     ci->enc_set_parameters(&params);
 344
 345     return true;
 346 } /* init_encoder */
 347
 348 /* main codec entry point */
 349 enum codec_status codec_main(void)
 350 {
 351     if (!init_encoder())
 352     {
 353         ci->enc_codec_loaded = -1;
 354         return CODEC_ERROR;
 355     }
 356
 357     /* main application waits for this flag during encoder loading */
 358     ci->enc_codec_loaded = 1;
 359
 360     /* main encoding loop */
 361     while(!ci->stop_encoder)
 362     {
 363         uint32_t *src;
 364
 365         while ((src = (uint32_t *)ci->enc_get_pcm_data(PCM_CHUNK_SIZE)) != NULL)
 366         {
 367             struct enc_chunk_hdr *chunk;
 368
 369             if (ci->stop_encoder)
 370                 break;
 371
 372             chunk           = ci->enc_get_chunk();
 373             chunk->enc_size = enc_size;
 374             chunk->num_pcm  = PCM_SAMP_PER_CHUNK;
 375             chunk->enc_data = ENC_CHUNK_SKIP_HDR(chunk->enc_data, chunk);
 376
 377             chunk_to_wav_format(src, (uint32_t *)chunk->enc_data);
 378
 379             ci->enc_finish_chunk();
 380             ci->yield();
 381         }
 382
 383         ci->yield();
 384     }
 385
 386     /* reset parameters to initial state */
 387     ci->enc_set_parameters(NULL);
 388
 389     /* main application waits for this flag during encoder removing */
 390     ci->enc_codec_loaded = 0;
 391
 392     return CODEC_OK;
 393 } /* codec_start */