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