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