src/flac/encode.c

   1 /* flac - Command-line FLAC encoder/decoder
   2  * Copyright (C) 2000,2001  Josh Coalson
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 /*@@@ need to "_finish()" the verify decoder */
  20
  21 #if defined _WIN32 && !defined __CYGWIN__
  22 /* where MSVC puts unlink() */
  23 # include <io.h>
  24 #else
  25 # include <unistd.h>
  26 #endif
  27 #include <stdio.h> /* for FILE et al. */
  28 #include <stdlib.h> /* for malloc */
  29 #include <string.h> /* for strcmp() */
  30 #include "FLAC/all.h"
  31 #include "encode.h"
  32
  33 #ifdef min
  34 #undef min
  35 #endif
  36 #define min(x,y) ((x)<(y)?(x):(y))
  37
  38 #define CHUNK_OF_SAMPLES 2048
  39
  40 typedef enum {
  41         FLAC__VERIFY_OK,
  42         FLAC__VERIFY_FAILED_IN_FRAME,
  43         FLAC__VERIFY_FAILED_IN_METADATA
  44 } verify_code;
  45
  46 static const char *verify_code_string[] = {
  47         "FLAC__VERIFY_OK",
  48         "FLAC__VERIFY_FAILED_IN_FRAME",
  49         "FLAC__VERIFY_FAILED_IN_METADATA"
  50 };
  51
  52 typedef struct {
  53         int32 *original[FLAC__MAX_CHANNELS];
  54         unsigned size; /* of each original[] in samples */
  55         unsigned tail; /* in wide samples */
  56         const byte *encoded_signal;
  57         unsigned encoded_signal_capacity;
  58         unsigned encoded_bytes;
  59         bool into_frames;
  60         verify_code result;
  61         FLAC__StreamDecoder *decoder;
  62 } verify_fifo_struct;
  63
  64 typedef struct {
  65         FILE *fout;
  66         const char *outfilename;
  67         FLAC__Encoder *encoder;
  68         bool verify;
  69         bool verbose;
  70         uint64 unencoded_size;
  71         uint64 total_samples_to_encode;
  72         uint64 bytes_written;
  73         uint64 samples_written;
  74         uint64 stream_offset; /* i.e. number of bytes before the first byte of the the first frame's header */
  75         unsigned current_frame;
  76         verify_fifo_struct verify_fifo;
  77         FLAC__StreamMetaData_SeekTable seek_table;
  78         unsigned first_seek_point_to_check;
  79 } encoder_wrapper_struct;
  80
  81 static bool is_big_endian_host;
  82
  83 static unsigned char ucbuffer[CHUNK_OF_SAMPLES*FLAC__MAX_CHANNELS*((FLAC__MAX_BITS_PER_SAMPLE+7)/8)];
  84 static signed char *scbuffer = (signed char *)ucbuffer;
  85 static uint16 *usbuffer = (uint16 *)ucbuffer;
  86 static int16 *ssbuffer = (int16 *)ucbuffer;
  87
  88 static int32 in[FLAC__MAX_CHANNELS][CHUNK_OF_SAMPLES];
  89 static int32 *input[FLAC__MAX_CHANNELS];
  90
  91 /* local routines */
  92 static bool init(encoder_wrapper_struct *encoder_wrapper);
  93 static bool init_encoder(bool lax, bool do_mid_side, bool loose_mid_side, bool do_exhaustive_model_search, bool do_qlp_coeff_prec_search, unsigned min_residual_partition_order, unsigned max_residual_partition_order, unsigned rice_parameter_search_dist, unsigned max_lpc_order, unsigned blocksize, unsigned qlp_coeff_precision, unsigned channels, unsigned bps, unsigned sample_rate, unsigned padding, char *requested_seek_points, int num_requested_seek_points, encoder_wrapper_struct *encoder_wrapper);
  94 static bool convert_to_seek_table(char *requested_seek_points, int num_requested_seek_points, uint64 stream_samples, unsigned blocksize, FLAC__StreamMetaData_SeekTable *seek_table);
  95 static void append_point_to_seek_table(FLAC__StreamMetaData_SeekTable *seek_table, uint64 sample, uint64 stream_samples, uint64 blocksize);
  96 static int seekpoint_compare(const FLAC__StreamMetaData_SeekPoint *l, const FLAC__StreamMetaData_SeekPoint *r);
  97 static void format_input(unsigned wide_samples, bool is_big_endian, bool is_unsigned_samples, unsigned channels, unsigned bps, encoder_wrapper_struct *encoder_wrapper);
  98 static FLAC__EncoderWriteStatus write_callback(const FLAC__Encoder *encoder, const byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data);
  99 static void metadata_callback(const FLAC__Encoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data);
 100 static FLAC__StreamDecoderReadStatus verify_read_callback(const FLAC__StreamDecoder *decoder, byte buffer[], unsigned *bytes, void *client_data);
 101 static FLAC__StreamDecoderWriteStatus verify_write_callback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const int32 *buffer[], void *client_data);
 102 static void verify_metadata_callback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data);
 103 static void verify_error_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
 104 static void print_stats(const encoder_wrapper_struct *encoder_wrapper);
 105 static bool read_little_endian_uint16(FILE *f, uint16 *val, bool eof_ok);
 106 static bool read_little_endian_uint32(FILE *f, uint32 *val, bool eof_ok);
 107 static bool write_big_endian_uint16(FILE *f, uint16 val);
 108 static bool write_big_endian_uint64(FILE *f, uint64 val);
 109
 110 int flac__encode_wav(FILE *infile, long infilesize, const char *infilename, const char *outfilename, const byte *lookahead, unsigned lookahead_length, bool verbose, uint64 skip, bool verify, bool lax, bool do_mid_side, bool loose_mid_side, bool do_exhaustive_model_search, bool do_qlp_coeff_prec_search, unsigned min_residual_partition_order, unsigned max_residual_partition_order, unsigned rice_parameter_search_dist, unsigned max_lpc_order, unsigned blocksize, unsigned qlp_coeff_precision, unsigned padding, char *requested_seek_points, int num_requested_seek_points)
 111 {
 112         encoder_wrapper_struct encoder_wrapper;
 113         bool is_unsigned_samples = false;
 114         unsigned channels = 0, bps = 0, sample_rate = 0, data_bytes;
 115         size_t bytes_per_wide_sample, bytes_read;
 116         uint16 x;
 117         uint32 xx;
 118         bool got_fmt_chunk = false, got_data_chunk = false;
 119
 120         encoder_wrapper.encoder = 0;
 121         encoder_wrapper.verify = verify;
 122         encoder_wrapper.verbose = verbose;
 123         encoder_wrapper.bytes_written = 0;
 124         encoder_wrapper.samples_written = 0;
 125         encoder_wrapper.stream_offset = 0;
 126         encoder_wrapper.outfilename = outfilename;
 127         encoder_wrapper.seek_table.points = 0;
 128         encoder_wrapper.first_seek_point_to_check = 0;
 129         (void)infilesize;
 130         (void)lookahead;
 131         (void)lookahead_length;
 132
 133         if(0 == strcmp(outfilename, "-")) {
 134                 encoder_wrapper.fout = stdout;
 135         }
 136         else {
 137                 if(0 == (encoder_wrapper.fout = fopen(outfilename, "wb"))) {
 138                         fprintf(stderr, "ERROR: can't open output file %s\n", outfilename);
 139                         fclose(infile);
 140                         return false;
 141                 }
 142         }
 143
 144         if(!init(&encoder_wrapper))
 145                 goto wav_abort_;
 146
 147         /*
 148          * lookahead[] already has "RIFFxxxxWAVE", do sub-chunks
 149          */
 150         while(!feof(infile)) {
 151                 if(!read_little_endian_uint32(infile, &xx, true))
 152                         goto wav_abort_;
 153                 if(feof(infile))
 154                         break;
 155                 if(xx == 0x20746d66) { /* "fmt " */
 156                         if(got_fmt_chunk) {
 157                                 fprintf(stderr, "WARNING: skipping extra 'fmt ' sub-chunk\n");
 158                         }
 159                         else {
 160                                 /* fmt chunk size */
 161                                 if(!read_little_endian_uint32(infile, &xx, false))
 162                                         goto wav_abort_;
 163                                 if(xx != 16) {
 164                                         fprintf(stderr, "ERROR: unsupported chunk\n");
 165                                         goto wav_abort_;
 166                                 }
 167                                 /* compression code */
 168                                 if(!read_little_endian_uint16(infile, &x, false))
 169                                         goto wav_abort_;
 170                                 if(x != 1) {
 171                                         fprintf(stderr, "ERROR: unsupported compression type %u\n", (unsigned)x);
 172                                         goto wav_abort_;
 173                                 }
 174                                 /* number of channels */
 175                                 if(!read_little_endian_uint16(infile, &x, false))
 176                                         goto wav_abort_;
 177                                 if(x == 0 || x > FLAC__MAX_CHANNELS) {
 178                                         fprintf(stderr, "ERROR: unsupported number channels %u\n", (unsigned)x);
 179                                         goto wav_abort_;
 180                                 }
 181                                 channels = x;
 182                                 /* sample rate */
 183                                 if(!read_little_endian_uint32(infile, &xx, false))
 184                                         goto wav_abort_;
 185                                 if(xx == 0 || xx > FLAC__MAX_SAMPLE_RATE) {
 186                                         fprintf(stderr, "ERROR: unsupported sample rate %u\n", (unsigned)xx);
 187                                         goto wav_abort_;
 188                                 }
 189                                 sample_rate = xx;
 190                                 /* avg bytes per second (ignored) */
 191                                 if(!read_little_endian_uint32(infile, &xx, false))
 192                                         goto wav_abort_;
 193                                 /* block align (ignored) */
 194                                 if(!read_little_endian_uint16(infile, &x, false))
 195                                         goto wav_abort_;
 196                                 /* bits per sample */
 197                                 if(!read_little_endian_uint16(infile, &x, false))
 198                                         goto wav_abort_;
 199                                 if(x != 8 && x != 16) {
 200                                         fprintf(stderr, "ERROR: unsupported bits per sample %u\n", (unsigned)x);
 201                                         goto wav_abort_;
 202                                 }
 203                                 bps = x;
 204                                 is_unsigned_samples = (x == 8);
 205
 206                                 got_fmt_chunk = true;
 207                         }
 208                 }
 209                 else if(xx == 0x61746164) { /* "data" */
 210                         if(got_data_chunk) {
 211                                 fprintf(stderr, "WARNING: skipping extra 'data' sub-chunk\n");
 212                         }
 213                         else if(!got_fmt_chunk) {
 214                                 fprintf(stderr, "ERROR: got data sub-chunk before fmt sub-chunk\n");
 215                                 goto wav_abort_;
 216                         }
 217                         else {
 218                                 /* data size */
 219                                 if(!read_little_endian_uint32(infile, &xx, false))
 220                                         goto wav_abort_;
 221                                 data_bytes = xx;
 222
 223                                 bytes_per_wide_sample = channels * (bps >> 3);
 224
 225                                 if(skip > 0) {
 226                                         if(infile != stdin) {
 227                                                 if(-1 == fseek(infile, bytes_per_wide_sample * (unsigned)skip, SEEK_CUR)) {
 228                                                         fprintf(stderr, "ERROR seeking while skipping samples in input file %s\n", infilename);
 229                                                         goto wav_abort_;
 230                                                 }
 231                                         }
 232                                         else {
 233                                                 unsigned left, need;
 234                                                 for(left = skip; left > 0; ) {
 235                                                         need = min(left, CHUNK_OF_SAMPLES);
 236                                                         if(fread(ucbuffer, 1, bytes_per_wide_sample * need, infile) < need) {
 237                                                                 fprintf(stderr, "ERROR seeking while skipping samples in input file %s\n", infilename);
 238                                                                 goto wav_abort_;
 239                                                         }
 240                                                         left -= need;
 241                                                 }
 242                                         }
 243                                 }
 244
 245                                 encoder_wrapper.total_samples_to_encode = data_bytes / bytes_per_wide_sample - skip;
 246                                 encoder_wrapper.unencoded_size = encoder_wrapper.total_samples_to_encode * bytes_per_wide_sample + 44; /* 44 for the size of the WAV headers */
 247
 248                                 if(!init_encoder(lax, do_mid_side, loose_mid_side, do_exhaustive_model_search, do_qlp_coeff_prec_search, min_residual_partition_order, max_residual_partition_order, rice_parameter_search_dist, max_lpc_order, blocksize, qlp_coeff_precision, channels, bps, sample_rate, padding, requested_seek_points, num_requested_seek_points, &encoder_wrapper))
 249                                         goto wav_abort_;
 250
 251                                 encoder_wrapper.verify_fifo.into_frames = true;
 252
 253                                 while(data_bytes > 0) {
 254                                         bytes_read = fread(ucbuffer, sizeof(unsigned char), CHUNK_OF_SAMPLES * bytes_per_wide_sample, infile);
 255                                         if(bytes_read == 0) {
 256                                                 if(ferror(infile)) {
 257                                                         fprintf(stderr, "ERROR reading from %s\n", infilename);
 258                                                         goto wav_abort_;
 259                                                 }
 260                                                 else if(feof(infile))
 261                                                         break;
 262                                         }
 263                                         else {
 264                                                 if(bytes_read > data_bytes)
 265                                                         bytes_read = data_bytes; /* chop off anything after the end of the data chunk */
 266                                                 if(bytes_read % bytes_per_wide_sample != 0) {
 267                                                         fprintf(stderr, "ERROR, got partial sample from input file %s\n", infilename);
 268                                                         goto wav_abort_;
 269                                                 }
 270                                                 else {
 271                                                         unsigned wide_samples = bytes_read / bytes_per_wide_sample;
 272                                                         format_input(wide_samples, false, is_unsigned_samples, channels, bps, &encoder_wrapper);
 273
 274                                                         /* NOTE: some versions of GCC can't figure out const-ness right and will give you an 'incompatible pointer type' warning on arg 2 here: */
 275                                                         if(!FLAC__encoder_process(encoder_wrapper.encoder, input, wide_samples)) {
 276                                                                 fprintf(stderr, "ERROR during encoding, state = %d:%s\n", encoder_wrapper.encoder->state, FLAC__EncoderStateString[encoder_wrapper.encoder->state]);
 277                                                                 goto wav_abort_;
 278                                                         }
 279                                                         data_bytes -= bytes_read;
 280                                                 }
 281                                         }
 282                                 }
 283                                 got_data_chunk = true;
 284                         }
 285                 }
 286                 else {
 287                         fprintf(stderr, "WARNING: skipping unknown sub-chunk '%c%c%c%c'\n", (char)(xx&255), (char)((xx>>8)&255), (char)((xx>>16)&255), (char)(xx>>24));
 288                         /* chunk size */
 289                         if(!read_little_endian_uint32(infile, &xx, false))
 290                                 goto wav_abort_;
 291                         if(infile != stdin) {
 292                                 if(-1 == fseek(infile, xx, SEEK_CUR)) {
 293                                         fprintf(stderr, "ERROR seeking ahead while skipping unsupported sub-chunk in input file %s\n", infilename);
 294                                         goto wav_abort_;
 295                                 }
 296                         }
 297                         else {
 298                                 unsigned left, need;
 299                                 const unsigned chunk = sizeof(ucbuffer);
 300                                 for(left = xx; left > 0; ) {
 301                                         need = min(left, chunk);
 302                                         if(fread(ucbuffer, 1, need, infile) < need) {
 303                                                 fprintf(stderr, "ERROR seeking while skipping unsupported sub-chunk in input file %s\n", infilename);
 304                                                 goto wav_abort_;
 305                                         }
 306                                         left -= need;
 307                                 }
 308                         }
 309                 }
 310         }
 311
 312         if(encoder_wrapper.encoder) {
 313                 if(encoder_wrapper.encoder->state == FLAC__ENCODER_OK)
 314                         FLAC__encoder_finish(encoder_wrapper.encoder);
 315                 FLAC__encoder_free_instance(encoder_wrapper.encoder);
 316         }
 317         if(encoder_wrapper.verbose && encoder_wrapper.total_samples_to_encode > 0) {
 318                 print_stats(&encoder_wrapper);
 319                 fprintf(stderr, "\n");
 320         }
 321         if(0 != encoder_wrapper.seek_table.points)
 322                 free(encoder_wrapper.seek_table.points);
 323         if(verify) {
 324                 if(encoder_wrapper.verify_fifo.result != FLAC__VERIFY_OK) {
 325                         fprintf(stderr, "%s: Verify FAILED! (%s)  Do not trust %s\n", infilename, verify_code_string[encoder_wrapper.verify_fifo.result], outfilename);
 326                         return 1;
 327                 }
 328                 else if(encoder_wrapper.verbose) {
 329                         fprintf(stderr, "%s: Verify succeeded\n", infilename);
 330                 }
 331         }
 332         if(infile != stdin)
 333                 fclose(infile);
 334         return 0;
 335 wav_abort_:
 336         if(encoder_wrapper.verbose && encoder_wrapper.total_samples_to_encode > 0)
 337                 fprintf(stderr, "\n");
 338         if(encoder_wrapper.encoder) {
 339                 if(encoder_wrapper.encoder->state == FLAC__ENCODER_OK)
 340                         FLAC__encoder_finish(encoder_wrapper.encoder);
 341                 FLAC__encoder_free_instance(encoder_wrapper.encoder);
 342         }
 343         if(0 != encoder_wrapper.seek_table.points)
 344                 free(encoder_wrapper.seek_table.points);
 345         if(verify) {
 346                 if(encoder_wrapper.verify_fifo.result != FLAC__VERIFY_OK) {
 347                         fprintf(stderr, "%s: Verify FAILED! (%s)  Do not trust %s\n", infilename, verify_code_string[encoder_wrapper.verify_fifo.result], outfilename);
 348                         return 1;
 349                 }
 350                 else if(encoder_wrapper.verbose) {
 351                         fprintf(stderr, "%s: Verify succeeded\n", infilename);
 352                 }
 353         }
 354         if(infile != stdin)
 355                 fclose(infile);
 356         unlink(outfilename);
 357         return 1;
 358 }
 359
 360 int flac__encode_raw(FILE *infile, long infilesize, const char *infilename, const char *outfilename, const byte *lookahead, unsigned lookahead_length, bool verbose, uint64 skip, bool verify, bool lax, bool do_mid_side, bool loose_mid_side, bool do_exhaustive_model_search, bool do_qlp_coeff_prec_search, unsigned min_residual_partition_order, unsigned max_residual_partition_order, unsigned rice_parameter_search_dist, unsigned max_lpc_order, unsigned blocksize, unsigned qlp_coeff_precision, unsigned padding, char *requested_seek_points, int num_requested_seek_points, bool is_big_endian, bool is_unsigned_samples, unsigned channels, unsigned bps, unsigned sample_rate)
 361 {
 362         encoder_wrapper_struct encoder_wrapper;
 363         size_t bytes_read;
 364         const size_t bytes_per_wide_sample = channels * (bps >> 3);
 365
 366         encoder_wrapper.encoder = 0;
 367         encoder_wrapper.verify = verify;
 368         encoder_wrapper.verbose = verbose;
 369         encoder_wrapper.bytes_written = 0;
 370         encoder_wrapper.samples_written = 0;
 371         encoder_wrapper.stream_offset = 0;
 372         encoder_wrapper.outfilename = outfilename;
 373         encoder_wrapper.seek_table.points = 0;
 374         encoder_wrapper.first_seek_point_to_check = 0;
 375
 376         if(0 == strcmp(outfilename, "-")) {
 377                 encoder_wrapper.fout = stdout;
 378         }
 379         else {
 380                 if(0 == (encoder_wrapper.fout = fopen(outfilename, "wb"))) {
 381                         fprintf(stderr, "ERROR: can't open output file %s\n", outfilename);
 382                         fclose(infile);
 383                         return false;
 384                 }
 385         }
 386
 387         if(!init(&encoder_wrapper))
 388                 goto raw_abort_;
 389
 390         /* get the file length */
 391         if(infilesize < 0) {
 392                 encoder_wrapper.total_samples_to_encode = encoder_wrapper.unencoded_size = 0;
 393         }
 394         else {
 395                 encoder_wrapper.unencoded_size = (unsigned)infilesize - skip * bytes_per_wide_sample;
 396                 encoder_wrapper.total_samples_to_encode = (unsigned)infilesize / bytes_per_wide_sample - skip;
 397         }
 398
 399         if(encoder_wrapper.verbose && encoder_wrapper.total_samples_to_encode <= 0)
 400                 fprintf(stderr, "(No runtime statistics possible; please wait for encoding to finish...)\n");
 401
 402         if(skip > 0) {
 403                 unsigned skip_bytes = bytes_per_wide_sample * (unsigned)skip;
 404                 if(skip_bytes > lookahead_length) {
 405                         skip_bytes -= lookahead_length;
 406                         lookahead_length = 0;
 407                         if(infile != stdin) {
 408                                 if(-1 == fseek(infile, (long)skip_bytes, SEEK_SET)) {
 409                                         fprintf(stderr, "ERROR seeking while skipping samples in input file %s\n", infilename);
 410                                         goto raw_abort_;
 411                                 }
 412                         }
 413                         else {
 414                                 unsigned left, need;
 415                                 const unsigned chunk = sizeof(ucbuffer);
 416                                 for(left = skip_bytes; left > 0; ) {
 417                                         need = min(left, chunk);
 418                                         if(fread(ucbuffer, 1, need, infile) < need) {
 419                                                 fprintf(stderr, "ERROR seeking while skipping samples in input file %s\n", infilename);
 420                                                 goto raw_abort_;
 421                                         }
 422                                         left -= need;
 423                                 }
 424                         }
 425                 }
 426                 else {
 427                         lookahead += skip_bytes;
 428                         lookahead_length -= skip_bytes;
 429                 }
 430         }
 431         else {
 432                 fseek(infile, 0, SEEK_SET);
 433         }
 434
 435         if(!init_encoder(lax, do_mid_side, loose_mid_side, do_exhaustive_model_search, do_qlp_coeff_prec_search, min_residual_partition_order, max_residual_partition_order, rice_parameter_search_dist, max_lpc_order, blocksize, qlp_coeff_precision, channels, bps, sample_rate, padding, requested_seek_points, num_requested_seek_points, &encoder_wrapper))
 436                 goto raw_abort_;
 437
 438         encoder_wrapper.verify_fifo.into_frames = true;
 439
 440         while(!feof(infile)) {
 441                 if(lookahead_length > 0) {
 442                         FLAC__ASSERT(lookahead_length < CHUNK_OF_SAMPLES * bytes_per_wide_sample);
 443                         memcpy(ucbuffer, lookahead, lookahead_length);
 444                         bytes_read = fread(ucbuffer+lookahead_length, sizeof(unsigned char), CHUNK_OF_SAMPLES * bytes_per_wide_sample - lookahead_length, infile) + lookahead_length;
 445                         if(ferror(infile)) {
 446                                 fprintf(stderr, "ERROR reading from %s\n", infilename);
 447                                 goto raw_abort_;
 448                         }
 449                         lookahead_length = 0;
 450                 }
 451                 else
 452                         bytes_read = fread(ucbuffer, sizeof(unsigned char), CHUNK_OF_SAMPLES * bytes_per_wide_sample, infile);
 453
 454                 if(bytes_read == 0) {
 455                         if(ferror(infile)) {
 456                                 fprintf(stderr, "ERROR reading from %s\n", infilename);
 457                                 goto raw_abort_;
 458                         }
 459                 }
 460                 else if(bytes_read % bytes_per_wide_sample != 0) {
 461                         fprintf(stderr, "ERROR, got partial sample from input file %s\n", infilename);
 462                         goto raw_abort_;
 463                 }
 464                 else {
 465                         unsigned wide_samples = bytes_read / bytes_per_wide_sample;
 466                         format_input(wide_samples, is_big_endian, is_unsigned_samples, channels, bps, &encoder_wrapper);
 467
 468                         /* NOTE: some versions of GCC can't figure out const-ness right and will give you an 'incompatible pointer type' warning on arg 2 here: */
 469                         if(!FLAC__encoder_process(encoder_wrapper.encoder, input, wide_samples)) {
 470                                 fprintf(stderr, "ERROR during encoding, state = %d:%s\n", encoder_wrapper.encoder->state, FLAC__EncoderStateString[encoder_wrapper.encoder->state]);
 471                                 goto raw_abort_;
 472                         }
 473                 }
 474         }
 475
 476         if(encoder_wrapper.encoder) {
 477                 if(encoder_wrapper.encoder->state == FLAC__ENCODER_OK)
 478                         FLAC__encoder_finish(encoder_wrapper.encoder);
 479                 FLAC__encoder_free_instance(encoder_wrapper.encoder);
 480         }
 481         if(encoder_wrapper.verbose && encoder_wrapper.total_samples_to_encode > 0) {
 482                 print_stats(&encoder_wrapper);
 483                 fprintf(stderr, "\n");
 484         }
 485         if(0 != encoder_wrapper.seek_table.points)
 486                 free(encoder_wrapper.seek_table.points);
 487         if(verify) {
 488                 if(encoder_wrapper.verify_fifo.result != FLAC__VERIFY_OK) {
 489                         fprintf(stderr, "%s: Verify FAILED! (%s)  Do not trust %s\n", infilename, verify_code_string[encoder_wrapper.verify_fifo.result], outfilename);
 490                         return 1;
 491                 }
 492                 else if(encoder_wrapper.verbose) {
 493                         fprintf(stderr, "%s: Verify succeeded\n", infilename);
 494                 }
 495         }
 496         if(infile != stdin)
 497                 fclose(infile);
 498         return 0;
 499 raw_abort_:
 500         if(encoder_wrapper.verbose && encoder_wrapper.total_samples_to_encode > 0)
 501                 fprintf(stderr, "\n");
 502         if(encoder_wrapper.encoder) {
 503                 if(encoder_wrapper.encoder->state == FLAC__ENCODER_OK)
 504                         FLAC__encoder_finish(encoder_wrapper.encoder);
 505                 FLAC__encoder_free_instance(encoder_wrapper.encoder);
 506         }
 507         if(0 != encoder_wrapper.seek_table.points)
 508                 free(encoder_wrapper.seek_table.points);
 509         if(verify) {
 510                 if(encoder_wrapper.verify_fifo.result != FLAC__VERIFY_OK) {
 511                         fprintf(stderr, "%s: Verify FAILED! (%s)  Do not trust %s\n", infilename, verify_code_string[encoder_wrapper.verify_fifo.result], outfilename);
 512                         return 1;
 513                 }
 514                 else if(encoder_wrapper.verbose) {
 515                         fprintf(stderr, "%s: Verify succeeded\n", infilename);
 516                 }
 517         }
 518         if(infile != stdin)
 519                 fclose(infile);
 520         unlink(outfilename);
 521         return 1;
 522 }
 523
 524 bool init(encoder_wrapper_struct *encoder_wrapper)
 525 {
 526         unsigned i;
 527         uint32 test = 1;
 528
 529         is_big_endian_host = (*((byte*)(&test)))? false : true;
 530
 531         for(i = 0; i < FLAC__MAX_CHANNELS; i++)
 532                 input[i] = &(in[i][0]);
 533
 534         encoder_wrapper->encoder = FLAC__encoder_get_new_instance();
 535         if(0 == encoder_wrapper->encoder) {
 536                 fprintf(stderr, "ERROR creating the encoder instance\n");
 537                 return false;
 538         }
 539
 540         return true;
 541 }
 542
 543 bool init_encoder(bool lax, bool do_mid_side, bool loose_mid_side, bool do_exhaustive_model_search, bool do_qlp_coeff_prec_search, unsigned min_residual_partition_order, unsigned max_residual_partition_order, unsigned rice_parameter_search_dist, unsigned max_lpc_order, unsigned blocksize, unsigned qlp_coeff_precision, unsigned channels, unsigned bps, unsigned sample_rate, unsigned padding, char *requested_seek_points, int num_requested_seek_points, encoder_wrapper_struct *encoder_wrapper)
 544 {
 545         unsigned i;
 546
 547         if(channels != 2)
 548                 do_mid_side = loose_mid_side = false;
 549
 550         if(encoder_wrapper->verify) {
 551                 /* set up the fifo which will hold the original signal to compare against */
 552                 encoder_wrapper->verify_fifo.size = blocksize + CHUNK_OF_SAMPLES;
 553                 for(i = 0; i < channels; i++) {
 554                         if(0 == (encoder_wrapper->verify_fifo.original[i] = (int32*)malloc(sizeof(int32) * encoder_wrapper->verify_fifo.size))) {
 555                                 fprintf(stderr, "ERROR allocating verify buffers\n");
 556                                 return false;
 557                         }
 558                 }
 559                 encoder_wrapper->verify_fifo.tail = 0;
 560                 encoder_wrapper->verify_fifo.into_frames = false;
 561                 encoder_wrapper->verify_fifo.result = FLAC__VERIFY_OK;
 562
 563                 /* set up a stream decoder for verification */
 564                 encoder_wrapper->verify_fifo.decoder = FLAC__stream_decoder_get_new_instance();
 565                 if(0 == encoder_wrapper->verify_fifo.decoder) {
 566                         fprintf(stderr, "ERROR creating the verify decoder instance\n");
 567                         return false;
 568                 }
 569                 if(FLAC__stream_decoder_init(encoder_wrapper->verify_fifo.decoder, verify_read_callback, verify_write_callback, verify_metadata_callback, verify_error_callback, encoder_wrapper) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA) {
 570                         fprintf(stderr, "ERROR initializing decoder, state = %d:%s\n", encoder_wrapper->verify_fifo.decoder->state, FLAC__StreamDecoderStateString[encoder_wrapper->verify_fifo.decoder->state]);
 571                         return false;
 572                 }
 573         }
 574
 575         if(!convert_to_seek_table(requested_seek_points, num_requested_seek_points, encoder_wrapper->total_samples_to_encode, blocksize, &encoder_wrapper->seek_table)) {
 576                 fprintf(stderr, "ERROR allocating seek table\n");
 577                 return false;
 578         }
 579
 580         encoder_wrapper->encoder->streamable_subset = !lax;
 581         encoder_wrapper->encoder->channels = channels;
 582         encoder_wrapper->encoder->bits_per_sample = bps;
 583         encoder_wrapper->encoder->sample_rate = sample_rate;
 584         encoder_wrapper->encoder->blocksize = blocksize;
 585         encoder_wrapper->encoder->qlp_coeff_precision = qlp_coeff_precision;
 586         encoder_wrapper->encoder->max_lpc_order = max_lpc_order;
 587         encoder_wrapper->encoder->do_mid_side_stereo = do_mid_side;
 588         encoder_wrapper->encoder->loose_mid_side_stereo = loose_mid_side;
 589         encoder_wrapper->encoder->do_exhaustive_model_search = do_exhaustive_model_search;
 590         encoder_wrapper->encoder->do_qlp_coeff_prec_search = do_qlp_coeff_prec_search;
 591         encoder_wrapper->encoder->min_residual_partition_order = min_residual_partition_order;
 592         encoder_wrapper->encoder->max_residual_partition_order = max_residual_partition_order;
 593         encoder_wrapper->encoder->rice_parameter_search_dist = rice_parameter_search_dist;
 594         encoder_wrapper->encoder->total_samples_estimate = encoder_wrapper->total_samples_to_encode;
 595         encoder_wrapper->encoder->seek_table = (encoder_wrapper->seek_table.num_points > 0)? &encoder_wrapper->seek_table : 0;
 596         encoder_wrapper->encoder->padding = padding;
 597
 598         if(FLAC__encoder_init(encoder_wrapper->encoder, write_callback, metadata_callback, encoder_wrapper) != FLAC__ENCODER_OK) {
 599                 fprintf(stderr, "ERROR initializing encoder, state = %d:%s\n", encoder_wrapper->encoder->state, FLAC__EncoderStateString[encoder_wrapper->encoder->state]);
 600                 return false;
 601         }
 602
 603         /* the above call writes all the metadata, so we save the stream offset now */
 604         encoder_wrapper->stream_offset = encoder_wrapper->bytes_written;
 605
 606         return true;
 607 }
 608
 609 bool convert_to_seek_table(char *requested_seek_points, int num_requested_seek_points, uint64 stream_samples, unsigned blocksize, FLAC__StreamMetaData_SeekTable *seek_table)
 610 {
 611         unsigned i, j, real_points, placeholders;
 612         char *pt = requested_seek_points, *q;
 613         bool first;
 614
 615         seek_table->num_points = 0;
 616
 617         if(num_requested_seek_points == 0)
 618                 return true;
 619
 620         if(num_requested_seek_points < 0) {
 621                 strcpy(requested_seek_points, "100x<");
 622                 num_requested_seek_points = 1;
 623         }
 624
 625         /* first count how many individual seek point we may need */
 626         real_points = placeholders = 0;
 627         for(i = 0; i < (unsigned)num_requested_seek_points; i++) {
 628                 q = strchr(pt, '<');
 629                 FLAC__ASSERT(0 != q);
 630                 *q = '\0';
 631
 632                 if(0 == strcmp(pt, "X")) { /* -S X */
 633                         placeholders++;
 634                 }
 635                 else if(pt[strlen(pt)-1] == 'x') { /* -S #x */
 636                         if(stream_samples > 0) /* we can only do these if we know the number of samples to encode up front */
 637                                 real_points += (unsigned)atoi(pt);
 638                 }
 639                 else { /* -S # */
 640                         real_points++;
 641                 }
 642                 *q++ = '<';
 643
 644                 pt = q;
 645         }
 646         pt = requested_seek_points;
 647
 648         /* make some space */
 649         if(0 == (seek_table->points = (FLAC__StreamMetaData_SeekPoint*)malloc(sizeof(FLAC__StreamMetaData_SeekPoint) * (real_points+placeholders))))
 650                 return false;
 651
 652         /* initialize the seek_table.  we set frame_samples to zero to signify the points have not yet been hit by a frame write yet. */
 653         for(i = 0; i < real_points+placeholders; i++) {
 654                 seek_table->points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
 655                 seek_table->points[i].stream_offset = 0;
 656                 seek_table->points[i].frame_samples = 0;
 657         }
 658
 659         for(i = 0; i < (unsigned)num_requested_seek_points; i++) {
 660                 q = strchr(pt, '<');
 661                 FLAC__ASSERT(0 != q);
 662                 *q++ = '\0';
 663
 664                 if(0 == strcmp(pt, "X")) { /* -S X */
 665                         ; /* we append placeholders later */
 666                 }
 667                 else if(pt[strlen(pt)-1] == 'x') { /* -S #x */
 668                         if(stream_samples > 0) { /* we can only do these if we know the number of samples to encode up front */
 669                                 unsigned j, n;
 670                                 n = (unsigned)atoi(pt);
 671                                 for(j = 0; j < n; j++)
 672                                         append_point_to_seek_table(seek_table, stream_samples * (uint64)j / (uint64)n, stream_samples, blocksize);
 673                         }
 674                 }
 675                 else { /* -S # */
 676                         append_point_to_seek_table(seek_table, (uint64)atoi(pt), stream_samples, blocksize);
 677                 }
 678
 679                 pt = q;
 680         }
 681
 682         /* sort the seekpoints */
 683         qsort(seek_table->points, seek_table->num_points, sizeof(FLAC__StreamMetaData_SeekPoint), (int (*)(const void *, const void *))seekpoint_compare);
 684
 685         /* uniqify the seekpoints */
 686         first = true;
 687         for(i = j = 0; i < seek_table->num_points; i++) {
 688                 if(!first) {
 689                         if(seek_table->points[i].sample_number == seek_table->points[j-1].sample_number)
 690                                 continue;
 691                 }
 692                 first = false;
 693                 seek_table->points[j++] = seek_table->points[i];
 694         }
 695         seek_table->num_points = j;
 696
 697         /* append placeholders */
 698         for(i = 0, j = seek_table->num_points; i < placeholders; i++, j++)
 699                 seek_table->points[j].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
 700         seek_table->num_points += placeholders;
 701
 702         return true;
 703 }
 704
 705 void append_point_to_seek_table(FLAC__StreamMetaData_SeekTable *seek_table, uint64 sample, uint64 stream_samples, uint64 blocksize)
 706 {
 707         const uint64 target_sample = (sample / blocksize) * blocksize;
 708
 709         if(stream_samples == 0 || target_sample < stream_samples)
 710                 seek_table->points[seek_table->num_points++].sample_number = target_sample;
 711 }
 712
 713 int seekpoint_compare(const FLAC__StreamMetaData_SeekPoint *l, const FLAC__StreamMetaData_SeekPoint *r)
 714 {
 715         /* we don't just 'return l->sample_number - r->sample_number' since the result (int64) might overflow an 'int' */
 716         if(l->sample_number == r->sample_number)
 717                 return 0;
 718         else if(l->sample_number < r->sample_number)
 719                 return -1;
 720         else
 721                 return 1;
 722 }
 723
 724 void format_input(unsigned wide_samples, bool is_big_endian, bool is_unsigned_samples, unsigned channels, unsigned bps, encoder_wrapper_struct *encoder_wrapper)
 725 {
 726         unsigned wide_sample, sample, channel, byte;
 727
 728         if(bps == 8) {
 729                 if(is_unsigned_samples) {
 730                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 731                                 for(channel = 0; channel < channels; channel++, sample++)
 732                                         input[channel][wide_sample] = (int32)ucbuffer[sample] - 0x80;
 733                 }
 734                 else {
 735                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 736                                 for(channel = 0; channel < channels; channel++, sample++)
 737                                         input[channel][wide_sample] = (int32)scbuffer[sample];
 738                 }
 739         }
 740         else if(bps == 16) {
 741                 if(is_big_endian != is_big_endian_host) {
 742                         unsigned char tmp;
 743                         const unsigned bytes = wide_samples * channels * (bps >> 3);
 744                         for(byte = 0; byte < bytes; byte += 2) {
 745                                 tmp = ucbuffer[byte];
 746                                 ucbuffer[byte] = ucbuffer[byte+1];
 747                                 ucbuffer[byte+1] = tmp;
 748                         }
 749                 }
 750                 if(is_unsigned_samples) {
 751                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 752                                 for(channel = 0; channel < channels; channel++, sample++)
 753                                         input[channel][wide_sample] = (int32)usbuffer[sample] - 0x8000;
 754                 }
 755                 else {
 756                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 757                                 for(channel = 0; channel < channels; channel++, sample++)
 758                                         input[channel][wide_sample] = (int32)ssbuffer[sample];
 759                 }
 760         }
 761         else if(bps == 24) {
 762                 if(!is_big_endian) {
 763                         unsigned char tmp;
 764                         const unsigned bytes = wide_samples * channels * (bps >> 3);
 765                         for(byte = 0; byte < bytes; byte += 3) {
 766                                 tmp = ucbuffer[byte];
 767                                 ucbuffer[byte] = ucbuffer[byte+2];
 768                                 ucbuffer[byte+2] = tmp;
 769                         }
 770                 }
 771                 if(is_unsigned_samples) {
 772                         for(byte = sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 773                                 for(channel = 0; channel < channels; channel++, sample++) {
 774                                         input[channel][wide_sample]  = ucbuffer[byte++]; input[channel][wide_sample] <<= 8;
 775                                         input[channel][wide_sample] |= ucbuffer[byte++]; input[channel][wide_sample] <<= 8;
 776                                         input[channel][wide_sample] |= ucbuffer[byte++];
 777                                         input[channel][wide_sample] -= 0x800000;
 778                                 }
 779                 }
 780                 else {
 781                         for(byte = sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 782                                 for(channel = 0; channel < channels; channel++, sample++) {
 783                                         input[channel][wide_sample]  = scbuffer[byte++]; input[channel][wide_sample] <<= 8;
 784                                         input[channel][wide_sample] |= ucbuffer[byte++]; input[channel][wide_sample] <<= 8;
 785                                         input[channel][wide_sample] |= ucbuffer[byte++];
 786                                 }
 787                 }
 788         }
 789         else {
 790                 FLAC__ASSERT(0);
 791         }
 792
 793         if(encoder_wrapper->verify) {
 794                 for(channel = 0; channel < channels; channel++)
 795                         memcpy(&encoder_wrapper->verify_fifo.original[channel][encoder_wrapper->verify_fifo.tail], &input[channel][0], sizeof(int32) * wide_samples);
 796                 encoder_wrapper->verify_fifo.tail += wide_samples;
 797                 FLAC__ASSERT(encoder_wrapper->verify_fifo.tail <= encoder_wrapper->verify_fifo.size);
 798         }
 799 }
 800
 801 FLAC__EncoderWriteStatus write_callback(const FLAC__Encoder *encoder, const byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data)
 802 {
 803         encoder_wrapper_struct *encoder_wrapper = (encoder_wrapper_struct *)client_data;
 804         unsigned mask = (encoder->do_exhaustive_model_search || encoder->do_qlp_coeff_prec_search)? 0x1f : 0x7f;
 805
 806         /* mark the current seek point if hit (if stream_offset == 0 that means we're still writing metadata and haven't hit the first frame yet) */
 807         if(encoder_wrapper->stream_offset > 0 && encoder_wrapper->seek_table.num_points > 0) {
 808                 uint64 current_sample = (uint64)current_frame * (uint64)encoder->blocksize, test_sample;
 809                 unsigned i;
 810                 for(i = encoder_wrapper->first_seek_point_to_check; i < encoder_wrapper->seek_table.num_points; i++) {
 811                         test_sample = encoder_wrapper->seek_table.points[i].sample_number;
 812                         if(test_sample > current_sample) {
 813                                 break;
 814                         }
 815                         else if(test_sample == current_sample) {
 816                                 encoder_wrapper->seek_table.points[i].stream_offset = encoder_wrapper->bytes_written - encoder_wrapper->stream_offset;
 817                                 encoder_wrapper->seek_table.points[i].frame_samples = encoder->blocksize;
 818                                 encoder_wrapper->first_seek_point_to_check++;
 819                                 break;
 820                         }
 821                         else {
 822                                 encoder_wrapper->first_seek_point_to_check++;
 823                         }
 824                 }
 825         }
 826
 827         encoder_wrapper->bytes_written += bytes;
 828         encoder_wrapper->samples_written += samples;
 829         encoder_wrapper->current_frame = current_frame;
 830
 831         if(samples && encoder_wrapper->verbose && encoder_wrapper->total_samples_to_encode > 0 && !(current_frame & mask))
 832                 print_stats(encoder_wrapper);
 833
 834         if(encoder_wrapper->verify) {
 835                 encoder_wrapper->verify_fifo.encoded_signal = buffer;
 836                 encoder_wrapper->verify_fifo.encoded_bytes = bytes;
 837                 if(encoder_wrapper->verify_fifo.into_frames) {
 838                         if(!FLAC__stream_decoder_process_one_frame(encoder_wrapper->verify_fifo.decoder)) {
 839                                 encoder_wrapper->verify_fifo.result = FLAC__VERIFY_FAILED_IN_FRAME;
 840                                 return FLAC__ENCODER_WRITE_FATAL_ERROR;
 841                         }
 842                 }
 843                 else {
 844                         if(!FLAC__stream_decoder_process_metadata(encoder_wrapper->verify_fifo.decoder)) {
 845                                 encoder_wrapper->verify_fifo.result = FLAC__VERIFY_FAILED_IN_METADATA;
 846                                 return FLAC__ENCODER_WRITE_FATAL_ERROR;
 847                         }
 848                 }
 849         }
 850
 851         if(fwrite(buffer, sizeof(byte), bytes, encoder_wrapper->fout) == bytes)
 852                 return FLAC__ENCODER_WRITE_OK;
 853         else
 854                 return FLAC__ENCODER_WRITE_FATAL_ERROR;
 855 }
 856
 857 void metadata_callback(const FLAC__Encoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data)
 858 {
 859         encoder_wrapper_struct *encoder_wrapper = (encoder_wrapper_struct *)client_data;
 860         byte b;
 861         FILE *f;
 862         const uint64 samples = metadata->data.stream_info.total_samples;
 863         const unsigned min_framesize = metadata->data.stream_info.min_framesize;
 864         const unsigned max_framesize = metadata->data.stream_info.max_framesize;
 865
 866         FLAC__ASSERT(metadata->type == FLAC__METADATA_TYPE_STREAMINFO);
 867
 868         /*
 869          * we get called by the encoder when the encoding process has
 870          * finished so that we can update the STREAMINFO and SEEKTABLE
 871          * blocks.
 872          */
 873
 874         (void)encoder; /* silence compiler warning about unused parameter */
 875
 876         if(encoder_wrapper->fout == stdout)
 877                 return;
 878
 879         fclose(encoder_wrapper->fout);
 880         if(0 == (f = fopen(encoder_wrapper->outfilename, "r+b")))
 881                 return;
 882
 883         /* all this is based on intimate knowledge of the stream header
 884          * layout, but a change to the header format that would break this
 885          * would also break all streams encoded in the previous format.
 886          */
 887
 888         if(-1 == fseek(f, 26, SEEK_SET)) goto samples_;
 889         fwrite(metadata->data.stream_info.md5sum, 1, 16, f);
 890
 891 samples_:
 892         if(-1 == fseek(f, 21, SEEK_SET)) goto framesize_;
 893         if(fread(&b, 1, 1, f) != 1) goto framesize_;
 894         if(-1 == fseek(f, 21, SEEK_SET)) goto framesize_;
 895         b = (b & 0xf0) | (byte)((samples >> 32) & 0x0F);
 896         if(fwrite(&b, 1, 1, f) != 1) goto framesize_;
 897         b = (byte)((samples >> 24) & 0xFF);
 898         if(fwrite(&b, 1, 1, f) != 1) goto framesize_;
 899         b = (byte)((samples >> 16) & 0xFF);
 900         if(fwrite(&b, 1, 1, f) != 1) goto framesize_;
 901         b = (byte)((samples >> 8) & 0xFF);
 902         if(fwrite(&b, 1, 1, f) != 1) goto framesize_;
 903         b = (byte)(samples & 0xFF);
 904         if(fwrite(&b, 1, 1, f) != 1) goto framesize_;
 905
 906 framesize_:
 907         if(-1 == fseek(f, 12, SEEK_SET)) goto seektable_;
 908         b = (byte)((min_framesize >> 16) & 0xFF);
 909         if(fwrite(&b, 1, 1, f) != 1) goto seektable_;
 910         b = (byte)((min_framesize >> 8) & 0xFF);
 911         if(fwrite(&b, 1, 1, f) != 1) goto seektable_;
 912         b = (byte)(min_framesize & 0xFF);
 913         if(fwrite(&b, 1, 1, f) != 1) goto seektable_;
 914         b = (byte)((max_framesize >> 16) & 0xFF);
 915         if(fwrite(&b, 1, 1, f) != 1) goto seektable_;
 916         b = (byte)((max_framesize >> 8) & 0xFF);
 917         if(fwrite(&b, 1, 1, f) != 1) goto seektable_;
 918         b = (byte)(max_framesize & 0xFF);
 919         if(fwrite(&b, 1, 1, f) != 1) goto seektable_;
 920
 921 seektable_:
 922         if(encoder_wrapper->seek_table.num_points > 0) {
 923                 long pos;
 924                 unsigned i;
 925
 926                 /* convert any unused seek points to placeholders */
 927                 for(i = 0; i < encoder_wrapper->seek_table.num_points; i++) {
 928                         if(encoder_wrapper->seek_table.points[i].sample_number == FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER)
 929                                 break;
 930                         else if(encoder_wrapper->seek_table.points[i].frame_samples == 0)
 931                                 encoder_wrapper->seek_table.points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
 932                 }
 933
 934                 /* the offset of the seek table data 'pos' should be after then stream sync and STREAMINFO block and SEEKTABLE header */
 935                 pos = (FLAC__STREAM_SYNC_LEN + FLAC__STREAM_METADATA_IS_LAST_LEN + FLAC__STREAM_METADATA_TYPE_LEN + FLAC__STREAM_METADATA_LENGTH_LEN) / 8;
 936                 pos += metadata->length;
 937                 pos += (FLAC__STREAM_METADATA_IS_LAST_LEN + FLAC__STREAM_METADATA_TYPE_LEN + FLAC__STREAM_METADATA_LENGTH_LEN) / 8;
 938                 if(-1 == fseek(f, pos, SEEK_SET)) goto end_;
 939                 for(i = 0; i < encoder_wrapper->seek_table.num_points; i++) {
 940                         if(!write_big_endian_uint64(f, encoder_wrapper->seek_table.points[i].sample_number)) goto end_;
 941                         if(!write_big_endian_uint64(f, encoder_wrapper->seek_table.points[i].stream_offset)) goto end_;
 942                         if(!write_big_endian_uint16(f, encoder_wrapper->seek_table.points[i].frame_samples)) goto end_;
 943                 }
 944         }
 945
 946 end_:
 947         fclose(f);
 948         return;
 949 }
 950
 951 FLAC__StreamDecoderReadStatus verify_read_callback(const FLAC__StreamDecoder *decoder, byte buffer[], unsigned *bytes, void *client_data)
 952 {
 953         encoder_wrapper_struct *encoder_wrapper = (encoder_wrapper_struct *)client_data;
 954         const unsigned encoded_bytes = encoder_wrapper->verify_fifo.encoded_bytes;
 955         (void)decoder;
 956
 957         if(encoded_bytes <= *bytes) {
 958                 *bytes = encoded_bytes;
 959                 memcpy(buffer, encoder_wrapper->verify_fifo.encoded_signal, *bytes);
 960         }
 961         else {
 962                 memcpy(buffer, encoder_wrapper->verify_fifo.encoded_signal, *bytes);
 963                 encoder_wrapper->verify_fifo.encoded_signal += *bytes;
 964                 encoder_wrapper->verify_fifo.encoded_bytes -= *bytes;
 965         }
 966
 967         return FLAC__STREAM_DECODER_READ_CONTINUE;
 968 }
 969
 970 FLAC__StreamDecoderWriteStatus verify_write_callback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const int32 *buffer[], void *client_data)
 971 {
 972         encoder_wrapper_struct *encoder_wrapper = (encoder_wrapper_struct *)client_data;
 973         unsigned channel, l, r;
 974
 975         for(channel = 0; channel < decoder->channels; channel++) {
 976                 if(0 != memcmp(buffer[channel], encoder_wrapper->verify_fifo.original[channel], sizeof(int32) * decoder->blocksize)) {
 977                         fprintf(stderr, "\nERROR: mismatch in decoded data, verify FAILED!\n");
 978                         fprintf(stderr, "       Please submit a bug report to\n");
 979                         fprintf(stderr, "           http://sourceforge.net/bugs/?func=addbug&group_id=13478\n");
 980                         fprintf(stderr, "       Make sure to include an email contact in the comment and/or use the\n");
 981                         fprintf(stderr, "       \"Monitor\" feature to monitor the bug status.\n");
 982                         return FLAC__STREAM_DECODER_WRITE_ABORT;
 983                 }
 984         }
 985         /* dequeue the frame from the fifo */
 986         for(channel = 0; channel < decoder->channels; channel++) {
 987                 for(l = 0, r = frame->header.blocksize; r < encoder_wrapper->verify_fifo.tail; l++, r++) {
 988                         encoder_wrapper->verify_fifo.original[channel][l] = encoder_wrapper->verify_fifo.original[channel][r];
 989                 }
 990         }
 991         encoder_wrapper->verify_fifo.tail -= frame->header.blocksize;
 992         return FLAC__STREAM_DECODER_WRITE_CONTINUE;
 993 }
 994
 995 void verify_metadata_callback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data)
 996 {
 997         (void)decoder;
 998         (void)metadata;
 999         (void)client_data;
1000 }
1001
1002 void verify_error_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
1003 {
1004         (void)decoder;
1005         (void)client_data;
1006         fprintf(stderr, "\nERROR: verification decoder returned error %d:%s\n", status, FLAC__StreamDecoderErrorStatusString[status]);
1007 }
1008
1009 void print_stats(const encoder_wrapper_struct *encoder_wrapper)
1010 {
1011 #ifdef _MSC_VER
1012         /* with VC++ you have to spoon feed it the casting */
1013         double progress = (double)(int64)encoder_wrapper->samples_written / (double)(int64)encoder_wrapper->total_samples_to_encode;
1014 #else
1015         double progress = (double)encoder_wrapper->samples_written / (double)encoder_wrapper->total_samples_to_encode;
1016 #endif
1017         fprintf(stderr, "\r%0.2f%% complete: frame %u, wrote %u bytes (%u/%u samples), r=%5.3f",
1018                 progress * 100.0, encoder_wrapper->current_frame,
1019                 (unsigned)encoder_wrapper->bytes_written, (unsigned)encoder_wrapper->samples_written, (unsigned)encoder_wrapper->total_samples_to_encode,
1020 #ifdef _MSC_VER
1021                 /* with VC++ you have to spoon feed it the casting */
1022                 (double)(int64)encoder_wrapper->bytes_written / ((double)(int64)encoder_wrapper->unencoded_size * progress)
1023 #else
1024                 (double)encoder_wrapper->bytes_written / ((double)encoder_wrapper->unencoded_size * progress)
1025 #endif
1026         );
1027 }
1028
1029 bool read_little_endian_uint16(FILE *f, uint16 *val, bool eof_ok)
1030 {
1031         size_t bytes_read = fread(val, 1, 2, f);
1032
1033         if(bytes_read == 0) {
1034                 if(!eof_ok) {
1035                         fprintf(stderr, "ERROR: unexpected EOF\n");
1036                         return false;
1037                 }
1038                 else
1039                         return true;
1040         }
1041         else if(bytes_read < 2) {
1042                 fprintf(stderr, "ERROR: unexpected EOF\n");
1043                 return false;
1044         }
1045         else {
1046                 if(is_big_endian_host) {
1047                         byte tmp, *b = (byte*)val;
1048                         tmp = b[1]; b[1] = b[0]; b[0] = tmp;
1049                 }
1050                 return true;
1051         }
1052 }
1053
1054 bool read_little_endian_uint32(FILE *f, uint32 *val, bool eof_ok)
1055 {
1056         size_t bytes_read = fread(val, 1, 4, f);
1057
1058         if(bytes_read == 0) {
1059                 if(!eof_ok) {
1060                         fprintf(stderr, "ERROR: unexpected EOF\n");
1061                         return false;
1062                 }
1063                 else
1064                         return true;
1065         }
1066         else if(bytes_read < 4) {
1067                 fprintf(stderr, "ERROR: unexpected EOF\n");
1068                 return false;
1069         }
1070         else {
1071                 if(is_big_endian_host) {
1072                         byte tmp, *b = (byte*)val;
1073                         tmp = b[3]; b[3] = b[0]; b[0] = tmp;
1074                         tmp = b[2]; b[2] = b[1]; b[1] = tmp;
1075                 }
1076                 return true;
1077         }
1078 }
1079
1080 bool write_big_endian_uint16(FILE *f, uint16 val)
1081 {
1082         if(!is_big_endian_host) {
1083                 byte *b = (byte *)&val, tmp;
1084                 tmp = b[0]; b[0] = b[1]; b[1] = tmp;
1085         }
1086         return fwrite(&val, 1, 2, f) == 2;
1087 }
1088
1089 bool write_big_endian_uint64(FILE *f, uint64 val)
1090 {
1091         if(!is_big_endian_host) {
1092                 byte *b = (byte *)&val, tmp;
1093                 tmp = b[0]; b[0] = b[7]; b[7] = tmp;
1094                 tmp = b[1]; b[1] = b[6]; b[6] = tmp;
1095                 tmp = b[2]; b[2] = b[5]; b[5] = tmp;
1096                 tmp = b[3]; b[3] = b[4]; b[4] = tmp;
1097         }
1098         return fwrite(&val, 1, 8, f) == 8;
1099 }