src/plugin_xmms/plugin.c

   1 /* libxmms-flac - XMMS FLAC input plugin
   2  * Copyright (C) 2000,2001,2002,2003  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 #include <pthread.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <stdio.h>
  23 #include <glib.h>
  24
  25 #include <xmms/plugin.h>
  26 #include <xmms/util.h>
  27 #include <xmms/configfile.h>
  28 #include <xmms/titlestring.h>
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include <config.h>
  32 #endif
  33
  34 #ifdef HAVE_LANGINFO_CODESET
  35 #include <langinfo.h>
  36 #endif
  37
  38 #include "FLAC/all.h"
  39 #include "plugin_common/all.h"
  40 #include "share/grabbag.h"
  41 #include "share/replaygain_synthesis.h"
  42 #include "configure.h"
  43 #include "wrap_id3.h"
  44 #include "charset.h"
  45
  46 #ifdef min
  47 #undef min
  48 #endif
  49 #define min(x,y) ((x)<(y)?(x):(y))
  50
  51 extern void FLAC_XMMS__file_info_box(char *filename);
  52
  53 typedef struct {
  54         FLAC__bool abort_flag;
  55         FLAC__bool is_playing;
  56         FLAC__bool eof;
  57         FLAC__bool play_thread_open; /* if true, is_playing must also be true */
  58         unsigned total_samples;
  59         unsigned bits_per_sample;
  60         unsigned channels;
  61         unsigned sample_rate;
  62         unsigned length_in_msec;
  63         gchar *title;
  64         AFormat sample_format;
  65         unsigned sample_format_bytes_per_sample;
  66         int seek_to_in_sec;
  67         FLAC__bool has_replaygain;
  68         double replay_scale;
  69         DitherContext dither_context;
  70 } file_info_struct;
  71
  72 static void FLAC_XMMS__init();
  73 static int  FLAC_XMMS__is_our_file(char *filename);
  74 static void FLAC_XMMS__play_file(char *filename);
  75 static void FLAC_XMMS__stop();
  76 static void FLAC_XMMS__pause(short p);
  77 static void FLAC_XMMS__seek(int time);
  78 static int  FLAC_XMMS__get_time();
  79 static void FLAC_XMMS__cleanup();
  80 static void FLAC_XMMS__get_song_info(char *filename, char **title, int *length);
  81
  82 static void *play_loop_(void *arg);
  83 static FLAC__bool safe_decoder_init_(const char *filename, FLAC__FileDecoder *decoder);
  84 static void safe_decoder_finish_(FLAC__FileDecoder *decoder);
  85 static void safe_decoder_delete_(FLAC__FileDecoder *decoder);
  86 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
  87 static void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
  88 static void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
  89
  90 InputPlugin flac_ip =
  91 {
  92         NULL,
  93         NULL,
  94         "Reference FLAC Player v" VERSION,
  95         FLAC_XMMS__init,
  96         FLAC_XMMS__aboutbox,
  97         FLAC_XMMS__configure,
  98         FLAC_XMMS__is_our_file,
  99         NULL,
 100         FLAC_XMMS__play_file,
 101         FLAC_XMMS__stop,
 102         FLAC_XMMS__pause,
 103         FLAC_XMMS__seek,
 104         NULL,
 105         FLAC_XMMS__get_time,
 106         NULL,
 107         NULL,
 108         FLAC_XMMS__cleanup,
 109         NULL,
 110         NULL,
 111         NULL,
 112         NULL,
 113         FLAC_XMMS__get_song_info,
 114         FLAC_XMMS__file_info_box,
 115         NULL
 116 };
 117
 118 #define SAMPLES_PER_WRITE 512
 119 #define SAMPLE_BUFFER_SIZE ((FLAC__MAX_BLOCK_SIZE + SAMPLES_PER_WRITE) * FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS * (24/8))
 120 static FLAC__byte sample_buffer_[SAMPLE_BUFFER_SIZE];
 121 static unsigned sample_buffer_first_, sample_buffer_last_;
 122
 123 static FLAC__FileDecoder *decoder_ = 0;
 124 static file_info_struct file_info_;
 125 static pthread_t decode_thread_;
 126 static FLAC__bool audio_error_ = false;
 127 static FLAC__bool is_big_endian_host_;
 128
 129 #define BITRATE_HIST_SEGMENT_MSEC 500
 130 /* 500ms * 50 = 25s should be enough */
 131 #define BITRATE_HIST_SIZE 50
 132 static unsigned bitrate_history_[BITRATE_HIST_SIZE];
 133
 134
 135 InputPlugin *get_iplugin_info()
 136 {
 137         flac_ip.description = g_strdup_printf("Reference FLAC Player v%s", FLAC__VERSION_STRING);
 138         return &flac_ip;
 139 }
 140
 141 void FLAC_XMMS__init()
 142 {
 143         ConfigFile *cfg;
 144         FLAC__uint32 test = 1;
 145
 146         is_big_endian_host_ = (*((FLAC__byte*)(&test)))? false : true;
 147
 148         flac_cfg.title.tag_override = FALSE;
 149         g_free(flac_cfg.title.tag_format);
 150         flac_cfg.title.convert_char_set = FALSE;
 151
 152         cfg = xmms_cfg_open_default_file();
 153
 154         /* title */
 155
 156         xmms_cfg_read_boolean(cfg, "flac", "title.tag_override", &flac_cfg.title.tag_override);
 157
 158         if(!xmms_cfg_read_string(cfg, "flac", "title.tag_format", &flac_cfg.title.tag_format))
 159                 flac_cfg.title.tag_format = g_strdup("%p - %t");
 160
 161         xmms_cfg_read_boolean(cfg, "flac", "title.convert_char_set", &flac_cfg.title.convert_char_set);
 162
 163         if(!xmms_cfg_read_string(cfg, "flac", "title.file_char_set", &flac_cfg.title.file_char_set))
 164                 flac_cfg.title.file_char_set = FLAC_plugin__charset_get_current();
 165
 166         if(!xmms_cfg_read_string(cfg, "flac", "title.user_char_set", &flac_cfg.title.user_char_set))
 167                 flac_cfg.title.user_char_set = FLAC_plugin__charset_get_current();
 168
 169         /* replaygain */
 170
 171         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.enable", &flac_cfg.output.replaygain.enable);
 172
 173         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.album_mode", &flac_cfg.output.replaygain.album_mode);
 174
 175         if(!xmms_cfg_read_int(cfg, "flac", "output.replaygain.preamp", &flac_cfg.output.replaygain.preamp))
 176                 flac_cfg.output.replaygain.preamp = 0;
 177
 178         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.hard_limit", &flac_cfg.output.replaygain.hard_limit);
 179
 180         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.normal.dither_24_to_16", &flac_cfg.output.resolution.normal.dither_24_to_16);
 181         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.replaygain.dither", &flac_cfg.output.resolution.replaygain.dither);
 182
 183         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.noise_shaping", &flac_cfg.output.resolution.replaygain.noise_shaping))
 184                 flac_cfg.output.resolution.replaygain.noise_shaping = 1;
 185
 186         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.bps_out", &flac_cfg.output.resolution.replaygain.bps_out))
 187                 flac_cfg.output.resolution.replaygain.bps_out = 16;
 188
 189         decoder_ = FLAC__file_decoder_new();
 190
 191         xmms_cfg_free(cfg);
 192 }
 193
 194 int FLAC_XMMS__is_our_file(char *filename)
 195 {
 196         char *ext;
 197
 198         ext = strrchr(filename, '.');
 199         if(ext)
 200                 if(!strcasecmp(ext, ".flac") || !strcasecmp(ext, ".fla"))
 201                         return 1;
 202         return 0;
 203 }
 204
 205 void FLAC_XMMS__play_file(char *filename)
 206 {
 207         FILE *f;
 208
 209         sample_buffer_first_ = sample_buffer_last_ = 0;
 210         audio_error_ = false;
 211         file_info_.abort_flag = false;
 212         file_info_.is_playing = false;
 213         file_info_.eof = false;
 214         file_info_.play_thread_open = false;
 215         file_info_.has_replaygain = false;
 216
 217         if(0 == (f = fopen(filename, "r")))
 218                 return;
 219         fclose(f);
 220
 221         if(decoder_ == 0)
 222                 return;
 223
 224         if(!safe_decoder_init_(filename, decoder_))
 225                 return;
 226
 227         if(file_info_.has_replaygain && flac_cfg.output.replaygain.enable) {
 228                 if(flac_cfg.output.resolution.replaygain.bps_out == 8) {
 229                         file_info_.sample_format = FMT_U8;
 230                         file_info_.sample_format_bytes_per_sample = 1;
 231                 }
 232                 else if(flac_cfg.output.resolution.replaygain.bps_out == 16) {
 233                         file_info_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
 234                         file_info_.sample_format_bytes_per_sample = 2;
 235                 }
 236                 else {
 237                         /*@@@ need some error here like wa2: MessageBox(mod_.hMainWindow, "ERROR: plugin can only handle 8/16-bit samples\n", "ERROR: plugin can only handle 8/16-bit samples", 0); */
 238                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", flac_cfg.output.resolution.replaygain.bps_out);
 239                         safe_decoder_finish_(decoder_);
 240                         return;
 241                 }
 242         }
 243         else {
 244                 if(file_info_.bits_per_sample == 8) {
 245                         file_info_.sample_format = FMT_U8;
 246                         file_info_.sample_format_bytes_per_sample = 1;
 247                 }
 248                 else if(file_info_.bits_per_sample == 16 || (file_info_.bits_per_sample == 24 && flac_cfg.output.resolution.normal.dither_24_to_16)) {
 249                         file_info_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
 250                         file_info_.sample_format_bytes_per_sample = 2;
 251                 }
 252                 else {
 253                         /*@@@ need some error here like wa2: MessageBox(mod_.hMainWindow, "ERROR: plugin can only handle 8/16-bit samples\n", "ERROR: plugin can only handle 8/16-bit samples", 0); */
 254                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", file_info_.bits_per_sample);
 255                         safe_decoder_finish_(decoder_);
 256                         return;
 257                 }
 258         }
 259         FLAC__replaygain_synthesis__init_dither_context(&file_info_.dither_context, file_info_.sample_format_bytes_per_sample * 8, flac_cfg.output.resolution.replaygain.noise_shaping);
 260         file_info_.is_playing = true;
 261
 262         if(flac_ip.output->open_audio(file_info_.sample_format, file_info_.sample_rate, file_info_.channels) == 0) {
 263                 audio_error_ = true;
 264                 safe_decoder_finish_(decoder_);
 265                 return;
 266         }
 267
 268         file_info_.title = flac_format_song_title(filename);
 269         flac_ip.set_info(file_info_.title, file_info_.length_in_msec, file_info_.sample_rate * file_info_.channels * file_info_.bits_per_sample, file_info_.sample_rate, file_info_.channels);
 270
 271         file_info_.seek_to_in_sec = -1;
 272         file_info_.play_thread_open = true;
 273         pthread_create(&decode_thread_, NULL, play_loop_, NULL);
 274 }
 275
 276 void FLAC_XMMS__stop()
 277 {
 278         if(file_info_.is_playing) {
 279                 file_info_.is_playing = false;
 280                 if(file_info_.play_thread_open) {
 281                         file_info_.play_thread_open = false;
 282                         pthread_join(decode_thread_, NULL);
 283                 }
 284                 flac_ip.output->close_audio();
 285                 safe_decoder_finish_(decoder_);
 286         }
 287 }
 288
 289 void FLAC_XMMS__pause(short p)
 290 {
 291         flac_ip.output->pause(p);
 292 }
 293
 294 void FLAC_XMMS__seek(int time)
 295 {
 296         file_info_.seek_to_in_sec = time;
 297         file_info_.eof = false;
 298
 299         while(file_info_.seek_to_in_sec != -1)
 300                 xmms_usleep(10000);
 301 }
 302
 303 int FLAC_XMMS__get_time()
 304 {
 305         if(audio_error_)
 306                 return -2;
 307         if(!file_info_.is_playing || (file_info_.eof && !flac_ip.output->buffer_playing()))
 308                 return -1;
 309         else
 310                 return flac_ip.output->output_time();
 311 }
 312
 313 void FLAC_XMMS__cleanup()
 314 {
 315         safe_decoder_delete_(decoder_);
 316         decoder_ = 0;
 317 }
 318
 319 void FLAC_XMMS__get_song_info(char *filename, char **title, int *length_in_msec)
 320 {
 321         FLAC__StreamMetadata streaminfo;
 322
 323         if(0 == filename)
 324                 filename = "";
 325
 326         if(!FLAC__metadata_get_streaminfo(filename, &streaminfo)) {
 327                 /* @@@ how to report the error? */
 328                 if(title) {
 329                         static const char *errtitle = "Invalid FLAC File: ";
 330                         *title = g_malloc(strlen(errtitle) + 1 + strlen(filename) + 1 + 1);
 331                         sprintf(*title, "%s\"%s\"", errtitle, filename);
 332                 }
 333                 if(length_in_msec)
 334                         *length_in_msec = -1;
 335                 return;
 336         }
 337
 338         if(title) {
 339                 *title = flac_format_song_title(filename);
 340         }
 341         if(length_in_msec)
 342                 *length_in_msec = streaminfo.data.stream_info.total_samples * 10 / (streaminfo.data.stream_info.sample_rate / 100);
 343 }
 344
 345 /***********************************************************************
 346  * local routines
 347  **********************************************************************/
 348
 349 void *play_loop_(void *arg)
 350 {
 351         unsigned written_time_last = 0, bh_index_last_w = 0, bh_index_last_o = BITRATE_HIST_SIZE, blocksize = 1;
 352         FLAC__uint64 decode_position_last = 0, decode_position_frame_last = 0, decode_position_frame = 0;
 353
 354         (void)arg;
 355
 356         while(file_info_.is_playing) {
 357                 if(!file_info_.eof) {
 358                         while(sample_buffer_last_ - sample_buffer_first_ < SAMPLES_PER_WRITE) {
 359                                 unsigned s;
 360
 361                                 s = sample_buffer_last_ - sample_buffer_first_;
 362                                 if(FLAC__file_decoder_get_state(decoder_) == FLAC__FILE_DECODER_END_OF_FILE) {
 363                                         file_info_.eof = true;
 364                                         break;
 365                                 }
 366                                 else if(!FLAC__file_decoder_process_single(decoder_)) {
 367                                         /*@@@ this should probably be a dialog */
 368                                         fprintf(stderr, "libxmms-flac: READ ERROR processing frame\n");
 369                                         file_info_.eof = true;
 370                                         break;
 371                                 }
 372                                 blocksize = sample_buffer_last_ - sample_buffer_first_ - s;
 373                                 decode_position_frame_last = decode_position_frame;
 374                                 if(!FLAC__file_decoder_get_decode_position(decoder_, &decode_position_frame))
 375                                         decode_position_frame = 0;
 376                         }
 377                         if(sample_buffer_last_ - sample_buffer_first_ > 0) {
 378                                 const unsigned n = min(sample_buffer_last_ - sample_buffer_first_, SAMPLES_PER_WRITE);
 379                                 int bytes = n * file_info_.channels * file_info_.sample_format_bytes_per_sample;
 380                                 FLAC__byte *sample_buffer_start = sample_buffer_ + sample_buffer_first_ * file_info_.channels * file_info_.sample_format_bytes_per_sample;
 381                                 unsigned written_time, bh_index_w;
 382                                 FLAC__uint64 decode_position;
 383
 384                                 sample_buffer_first_ += n;
 385                                 flac_ip.add_vis_pcm(flac_ip.output->written_time(), file_info_.sample_format, file_info_.channels, bytes, sample_buffer_start);
 386                                 while(flac_ip.output->buffer_free() < (int)bytes && file_info_.is_playing && file_info_.seek_to_in_sec == -1)
 387                                         xmms_usleep(10000);
 388                                 if(file_info_.is_playing && file_info_.seek_to_in_sec == -1)
 389                                         flac_ip.output->write_audio(sample_buffer_start, bytes);
 390
 391                                 /* compute current bitrate */
 392
 393                                 written_time = flac_ip.output->written_time();
 394                                 bh_index_w = written_time / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 395                                 if(bh_index_w != bh_index_last_w) {
 396                                         bh_index_last_w = bh_index_w;
 397                                         decode_position = decode_position_frame - (double)(sample_buffer_last_ - sample_buffer_first_) * (double)(decode_position_frame - decode_position_frame_last) / (double)blocksize;
 398                                         bitrate_history_[(bh_index_w + BITRATE_HIST_SIZE - 1) % BITRATE_HIST_SIZE] =
 399                                                 decode_position > decode_position_last && written_time > written_time_last ?
 400                                                         8000 * (decode_position - decode_position_last) / (written_time - written_time_last) :
 401                                                         file_info_.sample_rate * file_info_.channels * file_info_.bits_per_sample;
 402                                         decode_position_last = decode_position;
 403                                         written_time_last = written_time;
 404                                 }
 405                         }
 406                         else {
 407                                 file_info_.eof = true;
 408                                 xmms_usleep(10000);
 409                         }
 410                 }
 411                 else
 412                         xmms_usleep(10000);
 413                 if(file_info_.seek_to_in_sec != -1) {
 414                         const double distance = (double)file_info_.seek_to_in_sec * 1000.0 / (double)file_info_.length_in_msec;
 415                         unsigned target_sample = (unsigned)(distance * (double)file_info_.total_samples);
 416                         if(FLAC__file_decoder_seek_absolute(decoder_, (FLAC__uint64)target_sample)) {
 417                                 flac_ip.output->flush(file_info_.seek_to_in_sec * 1000);
 418                                 bh_index_last_w = bh_index_last_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 419                                 if(!FLAC__file_decoder_get_decode_position(decoder_, &decode_position_frame))
 420                                         decode_position_frame = 0;
 421                                 file_info_.seek_to_in_sec = -1;
 422                                 file_info_.eof = false;
 423                                 sample_buffer_first_ = sample_buffer_last_ = 0;
 424                         }
 425                 }
 426                 else {
 427                         /* display the right bitrate from history */
 428                         unsigned bh_index_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 429                         if(bh_index_o != bh_index_last_o && bh_index_o != bh_index_last_w && bh_index_o != (bh_index_last_w + 1) % BITRATE_HIST_SIZE) {
 430                                 bh_index_last_o = bh_index_o;
 431                                 flac_ip.set_info(file_info_.title, file_info_.length_in_msec, bitrate_history_[bh_index_o], file_info_.sample_rate, file_info_.channels);
 432                         }
 433                 }
 434         }
 435
 436         safe_decoder_finish_(decoder_);
 437
 438         /* are these two calls necessary? */
 439         flac_ip.output->buffer_free();
 440         flac_ip.output->buffer_free();
 441
 442         g_free(file_info_.title);
 443
 444         pthread_exit(NULL);
 445         return 0; /* to silence the compiler warning about not returning a value */
 446 }
 447
 448 FLAC__bool safe_decoder_init_(const char *filename, FLAC__FileDecoder *decoder)
 449 {
 450         if(decoder == 0)
 451                 return false;
 452
 453         safe_decoder_finish_(decoder);
 454
 455         FLAC__file_decoder_set_md5_checking(decoder, false);
 456         FLAC__file_decoder_set_filename(decoder, filename);
 457         FLAC__file_decoder_set_metadata_ignore_all(decoder);
 458         FLAC__file_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO);
 459         FLAC__file_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_VORBIS_COMMENT);
 460         FLAC__file_decoder_set_write_callback(decoder, write_callback_);
 461         FLAC__file_decoder_set_metadata_callback(decoder, metadata_callback_);
 462         FLAC__file_decoder_set_error_callback(decoder, error_callback_);
 463         FLAC__file_decoder_set_client_data(decoder, &file_info_);
 464         if(FLAC__file_decoder_init(decoder) != FLAC__FILE_DECODER_OK)
 465                 return false;
 466
 467         if(!FLAC__file_decoder_process_until_end_of_metadata(decoder))
 468                 return false;
 469
 470         return true;
 471 }
 472
 473 void safe_decoder_finish_(FLAC__FileDecoder *decoder)
 474 {
 475         if(decoder && FLAC__file_decoder_get_state(decoder) != FLAC__FILE_DECODER_UNINITIALIZED)
 476                 FLAC__file_decoder_finish(decoder);
 477 }
 478
 479 void safe_decoder_delete_(FLAC__FileDecoder *decoder)
 480 {
 481         if(decoder) {
 482                 safe_decoder_finish_(decoder);
 483                 FLAC__file_decoder_delete(decoder);
 484         }
 485 }
 486
 487 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
 488 {
 489         file_info_struct *file_info = (file_info_struct *)client_data;
 490         const unsigned channels = file_info->channels, wide_samples = frame->header.blocksize;
 491         const unsigned bits_per_sample = file_info->bits_per_sample;
 492         FLAC__byte *sample_buffer_start;
 493
 494         (void)decoder;
 495
 496         if(file_info->abort_flag)
 497                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 498
 499         if((sample_buffer_last_ + wide_samples) > (SAMPLE_BUFFER_SIZE / (channels * file_info->sample_format_bytes_per_sample))) {
 500                 memmove(sample_buffer_, sample_buffer_ + sample_buffer_first_ * channels * file_info->sample_format_bytes_per_sample, (sample_buffer_last_ - sample_buffer_first_) * channels * file_info->sample_format_bytes_per_sample);
 501                 sample_buffer_last_ -= sample_buffer_first_;
 502                 sample_buffer_first_ = 0;
 503         }
 504         sample_buffer_start = sample_buffer_ + sample_buffer_last_ * channels * file_info->sample_format_bytes_per_sample;
 505         if(file_info->has_replaygain && flac_cfg.output.replaygain.enable) {
 506                 FLAC__replaygain_synthesis__apply_gain(
 507                                 sample_buffer_start,
 508                                 !is_big_endian_host_,
 509                                 file_info->sample_format_bytes_per_sample == 1, /* unsigned_data_out */
 510                                 buffer,
 511                                 wide_samples,
 512                                 channels,
 513                                 bits_per_sample,
 514                                 file_info->sample_format_bytes_per_sample * 8,
 515                                 file_info->replay_scale,
 516                                 flac_cfg.output.replaygain.hard_limit,
 517                                 flac_cfg.output.resolution.replaygain.dither,
 518                                 &file_info->dither_context
 519                 );
 520         }
 521         else if(is_big_endian_host_) {
 522                 FLAC__plugin_common__pack_pcm_signed_big_endian(
 523                         sample_buffer_start,
 524                         buffer,
 525                         wide_samples,
 526                         channels,
 527                         bits_per_sample,
 528                         file_info->sample_format_bytes_per_sample * 8
 529                 );
 530         }
 531         else {
 532                 FLAC__plugin_common__pack_pcm_signed_little_endian(
 533                         sample_buffer_start,
 534                         buffer,
 535                         wide_samples,
 536                         channels,
 537                         bits_per_sample,
 538                         file_info->sample_format_bytes_per_sample * 8
 539                 );
 540         }
 541
 542         sample_buffer_last_ += wide_samples;
 543
 544         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
 545 }
 546
 547 void metadata_callback_(const FLAC__FileDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
 548 {
 549         file_info_struct *file_info = (file_info_struct *)client_data;
 550         (void)decoder;
 551         if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
 552                 FLAC__ASSERT(metadata->data.stream_info.total_samples < 0x100000000); /* this plugin can only handle < 4 gigasamples */
 553                 file_info->total_samples = (unsigned)(metadata->data.stream_info.total_samples&0xffffffff);
 554                 file_info->bits_per_sample = metadata->data.stream_info.bits_per_sample;
 555                 file_info->channels = metadata->data.stream_info.channels;
 556                 file_info->sample_rate = metadata->data.stream_info.sample_rate;
 557                 file_info->length_in_msec = (FLAC__uint64)file_info->total_samples * 10 / (file_info->sample_rate / 100);
 558         }
 559         else if(metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
 560                 double gain, peak;
 561                 if(grabbag__replaygain_load_from_vorbiscomment(metadata, flac_cfg.output.replaygain.album_mode, &gain, &peak)) {
 562                         file_info->has_replaygain = true;
 563                         file_info->replay_scale = grabbag__replaygain_compute_scale_factor(peak, gain, (double)flac_cfg.output.replaygain.preamp, /*prevent_clipping=*/!flac_cfg.output.replaygain.hard_limit);
 564                 }
 565         }
 566 }
 567
 568 void error_callback_(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
 569 {
 570         file_info_struct *file_info = (file_info_struct *)client_data;
 571         (void)decoder;
 572         if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
 573                 file_info->abort_flag = true;
 574 }