src/plugin_xmms/plugin.c

   1 /* libxmms-flac - XMMS FLAC input plugin
   2  * Copyright (C) 2000,2001,2002,2003,2004,2005,2006  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 HAVE_CONFIG_H
  20 #  include <config.h>
  21 #endif
  22
  23 #include <limits.h>
  24 #include <pthread.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include <glib.h>
  29 #include <pwd.h>
  30 #include <sys/types.h>
  31 #include <unistd.h>
  32
  33 #include <xmms/plugin.h>
  34 #include <xmms/util.h>
  35 #include <xmms/configfile.h>
  36 #include <xmms/titlestring.h>
  37
  38 #ifdef HAVE_LANGINFO_CODESET
  39 #include <langinfo.h>
  40 #endif
  41
  42 #include "FLAC/all.h"
  43 #include "plugin_common/all.h"
  44 #include "share/grabbag.h"
  45 #include "share/replaygain_synthesis.h"
  46 #include "configure.h"
  47 #include "charset.h"
  48 #include "http.h"
  49 #include "tag.h"
  50
  51 #ifdef min
  52 #undef min
  53 #endif
  54 #define min(x,y) ((x)<(y)?(x):(y))
  55
  56 extern void FLAC_XMMS__file_info_box(char *filename);
  57
  58 typedef struct {
  59         FLAC__bool abort_flag;
  60         FLAC__bool is_playing;
  61         FLAC__bool is_http_source;
  62         FLAC__bool eof;
  63         FLAC__bool play_thread_open; /* if true, is_playing must also be true */
  64         FLAC__uint64 total_samples;
  65         unsigned bits_per_sample;
  66         unsigned channels;
  67         unsigned sample_rate;
  68         int length_in_msec; /* int (instead of FLAC__uint64) only because that's what XMMS uses; seeking won't work right if this maxes out */
  69         gchar *title;
  70         AFormat sample_format;
  71         unsigned sample_format_bytes_per_sample;
  72         int seek_to_in_sec;
  73         FLAC__bool has_replaygain;
  74         double replay_scale;
  75         DitherContext dither_context;
  76 } stream_data_struct;
  77
  78 static void FLAC_XMMS__init();
  79 static int  FLAC_XMMS__is_our_file(char *filename);
  80 static void FLAC_XMMS__play_file(char *filename);
  81 static void FLAC_XMMS__stop();
  82 static void FLAC_XMMS__pause(short p);
  83 static void FLAC_XMMS__seek(int time);
  84 static int  FLAC_XMMS__get_time();
  85 static void FLAC_XMMS__cleanup();
  86 static void FLAC_XMMS__get_song_info(char *filename, char **title, int *length);
  87
  88 static void *play_loop_(void *arg);
  89
  90 static FLAC__bool safe_decoder_init_(const char *filename, FLAC__StreamDecoder *decoder);
  91 static void safe_decoder_finish_(FLAC__StreamDecoder *decoder);
  92 static void safe_decoder_delete_(FLAC__StreamDecoder *decoder);
  93
  94 static FLAC__StreamDecoderReadStatus http_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data);
  95 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
  96 static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
  97 static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
  98
  99 InputPlugin flac_ip =
 100 {
 101         NULL,
 102         NULL,
 103         "FLAC Player v" VERSION,
 104         FLAC_XMMS__init,
 105         FLAC_XMMS__aboutbox,
 106         FLAC_XMMS__configure,
 107         FLAC_XMMS__is_our_file,
 108         NULL,
 109         FLAC_XMMS__play_file,
 110         FLAC_XMMS__stop,
 111         FLAC_XMMS__pause,
 112         FLAC_XMMS__seek,
 113         NULL,
 114         FLAC_XMMS__get_time,
 115         NULL,
 116         NULL,
 117         FLAC_XMMS__cleanup,
 118         NULL,
 119         NULL,
 120         NULL,
 121         NULL,
 122         FLAC_XMMS__get_song_info,
 123         FLAC_XMMS__file_info_box,
 124         NULL
 125 };
 126
 127 #define SAMPLES_PER_WRITE 512
 128 #define SAMPLE_BUFFER_SIZE ((FLAC__MAX_BLOCK_SIZE + SAMPLES_PER_WRITE) * FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS * (24/8))
 129 static FLAC__byte sample_buffer_[SAMPLE_BUFFER_SIZE];
 130 static unsigned sample_buffer_first_, sample_buffer_last_;
 131
 132 static FLAC__StreamDecoder *decoder_ = 0;
 133 static stream_data_struct stream_data_;
 134 static pthread_t decode_thread_;
 135 static FLAC__bool audio_error_ = false;
 136 static FLAC__bool is_big_endian_host_;
 137
 138 #define BITRATE_HIST_SEGMENT_MSEC 500
 139 /* 500ms * 50 = 25s should be enough */
 140 #define BITRATE_HIST_SIZE 50
 141 static unsigned bitrate_history_[BITRATE_HIST_SIZE];
 142
 143
 144 InputPlugin *get_iplugin_info()
 145 {
 146         flac_ip.description = g_strdup_printf("Reference FLAC Player v%s", FLAC__VERSION_STRING);
 147         return &flac_ip;
 148 }
 149
 150 void set_track_info(const char* title, int length_in_msec)
 151 {
 152         if (stream_data_.is_playing) {
 153                 flac_ip.set_info((char*) title, length_in_msec, stream_data_.sample_rate * stream_data_.channels * stream_data_.bits_per_sample, stream_data_.sample_rate, stream_data_.channels);
 154         }
 155 }
 156
 157 static gchar* homedir()
 158 {
 159         gchar *result;
 160         char *env_home = getenv("HOME");
 161         if (env_home) {
 162                 result = g_strdup (env_home);
 163         } else {
 164                 uid_t uid = getuid();
 165                 struct passwd *pwent;
 166                 do {
 167                         pwent = getpwent();
 168                 } while (pwent && pwent->pw_uid != uid);
 169                 result = pwent ? g_strdup (pwent->pw_dir) : NULL;
 170                 endpwent();
 171         }
 172         return result;
 173 }
 174
 175 static FLAC__bool is_http_source(const char *source)
 176 {
 177         return 0 == strncasecmp(source, "http://", 7);
 178 }
 179
 180 void FLAC_XMMS__init()
 181 {
 182         ConfigFile *cfg;
 183         FLAC__uint32 test = 1;
 184
 185         is_big_endian_host_ = (*((FLAC__byte*)(&test)))? false : true;
 186
 187         flac_cfg.title.tag_override = FALSE;
 188         if (flac_cfg.title.tag_format)
 189                 g_free(flac_cfg.title.tag_format);
 190         flac_cfg.title.convert_char_set = FALSE;
 191
 192         cfg = xmms_cfg_open_default_file();
 193
 194         /* title */
 195
 196         xmms_cfg_read_boolean(cfg, "flac", "title.tag_override", &flac_cfg.title.tag_override);
 197
 198         if(!xmms_cfg_read_string(cfg, "flac", "title.tag_format", &flac_cfg.title.tag_format))
 199                 flac_cfg.title.tag_format = g_strdup("%p - %t");
 200
 201         xmms_cfg_read_boolean(cfg, "flac", "title.convert_char_set", &flac_cfg.title.convert_char_set);
 202
 203         if(!xmms_cfg_read_string(cfg, "flac", "title.user_char_set", &flac_cfg.title.user_char_set))
 204                 flac_cfg.title.user_char_set = FLAC_plugin__charset_get_current();
 205
 206         /* replaygain */
 207
 208         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.enable", &flac_cfg.output.replaygain.enable);
 209
 210         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.album_mode", &flac_cfg.output.replaygain.album_mode);
 211
 212         if(!xmms_cfg_read_int(cfg, "flac", "output.replaygain.preamp", &flac_cfg.output.replaygain.preamp))
 213                 flac_cfg.output.replaygain.preamp = 0;
 214
 215         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.hard_limit", &flac_cfg.output.replaygain.hard_limit);
 216
 217         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.normal.dither_24_to_16", &flac_cfg.output.resolution.normal.dither_24_to_16);
 218         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.replaygain.dither", &flac_cfg.output.resolution.replaygain.dither);
 219
 220         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.noise_shaping", &flac_cfg.output.resolution.replaygain.noise_shaping))
 221                 flac_cfg.output.resolution.replaygain.noise_shaping = 1;
 222
 223         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.bps_out", &flac_cfg.output.resolution.replaygain.bps_out))
 224                 flac_cfg.output.resolution.replaygain.bps_out = 16;
 225
 226         /* stream */
 227
 228         xmms_cfg_read_int(cfg, "flac", "stream.http_buffer_size", &flac_cfg.stream.http_buffer_size);
 229         xmms_cfg_read_int(cfg, "flac", "stream.http_prebuffer", &flac_cfg.stream.http_prebuffer);
 230         xmms_cfg_read_boolean(cfg, "flac", "stream.use_proxy", &flac_cfg.stream.use_proxy);
 231         if(flac_cfg.stream.proxy_host)
 232                 g_free(flac_cfg.stream.proxy_host);
 233         if(!xmms_cfg_read_string(cfg, "flac", "stream.proxy_host", &flac_cfg.stream.proxy_host))
 234                 flac_cfg.stream.proxy_host = g_strdup("");
 235         xmms_cfg_read_int(cfg, "flac", "stream.proxy_port", &flac_cfg.stream.proxy_port);
 236         xmms_cfg_read_boolean(cfg, "flac", "stream.proxy_use_auth", &flac_cfg.stream.proxy_use_auth);
 237         if(flac_cfg.stream.proxy_user)
 238                 g_free(flac_cfg.stream.proxy_user);
 239         flac_cfg.stream.proxy_user = NULL;
 240         xmms_cfg_read_string(cfg, "flac", "stream.proxy_user", &flac_cfg.stream.proxy_user);
 241         if(flac_cfg.stream.proxy_pass)
 242                 g_free(flac_cfg.stream.proxy_pass);
 243         flac_cfg.stream.proxy_pass = NULL;
 244         xmms_cfg_read_string(cfg, "flac", "stream.proxy_pass", &flac_cfg.stream.proxy_pass);
 245         xmms_cfg_read_boolean(cfg, "flac", "stream.save_http_stream", &flac_cfg.stream.save_http_stream);
 246         if (flac_cfg.stream.save_http_path)
 247                 g_free (flac_cfg.stream.save_http_path);
 248         if (!xmms_cfg_read_string(cfg, "flac", "stream.save_http_path", &flac_cfg.stream.save_http_path) || ! *flac_cfg.stream.save_http_path) {
 249                 if (flac_cfg.stream.save_http_path)
 250                         g_free (flac_cfg.stream.save_http_path);
 251                 flac_cfg.stream.save_http_path = homedir();
 252         }
 253         xmms_cfg_read_boolean(cfg, "flac", "stream.cast_title_streaming", &flac_cfg.stream.cast_title_streaming);
 254         xmms_cfg_read_boolean(cfg, "flac", "stream.use_udp_channel", &flac_cfg.stream.use_udp_channel);
 255
 256         decoder_ = FLAC__stream_decoder_new();
 257
 258         xmms_cfg_free(cfg);
 259 }
 260
 261 int FLAC_XMMS__is_our_file(char *filename)
 262 {
 263         char *ext;
 264
 265         ext = strrchr(filename, '.');
 266         if(ext)
 267                 if(!strcasecmp(ext, ".flac") || !strcasecmp(ext, ".fla"))
 268                         return 1;
 269         return 0;
 270 }
 271
 272 void FLAC_XMMS__play_file(char *filename)
 273 {
 274         FILE *f;
 275
 276         sample_buffer_first_ = sample_buffer_last_ = 0;
 277         audio_error_ = false;
 278         stream_data_.abort_flag = false;
 279         stream_data_.is_playing = false;
 280         stream_data_.is_http_source = is_http_source(filename);
 281         stream_data_.eof = false;
 282         stream_data_.play_thread_open = false;
 283         stream_data_.has_replaygain = false;
 284
 285         if(!is_http_source(filename)) {
 286                 if(0 == (f = fopen(filename, "r")))
 287                         return;
 288                 fclose(f);
 289         }
 290
 291         if(decoder_ == 0)
 292                 return;
 293
 294         if(!safe_decoder_init_(filename, decoder_))
 295                 return;
 296
 297         if(stream_data_.has_replaygain && flac_cfg.output.replaygain.enable) {
 298                 if(flac_cfg.output.resolution.replaygain.bps_out == 8) {
 299                         stream_data_.sample_format = FMT_U8;
 300                         stream_data_.sample_format_bytes_per_sample = 1;
 301                 }
 302                 else if(flac_cfg.output.resolution.replaygain.bps_out == 16) {
 303                         stream_data_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
 304                         stream_data_.sample_format_bytes_per_sample = 2;
 305                 }
 306                 else {
 307                         /*@@@ 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); */
 308                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", flac_cfg.output.resolution.replaygain.bps_out);
 309                         safe_decoder_finish_(decoder_);
 310                         return;
 311                 }
 312         }
 313         else {
 314                 if(stream_data_.bits_per_sample == 8) {
 315                         stream_data_.sample_format = FMT_U8;
 316                         stream_data_.sample_format_bytes_per_sample = 1;
 317                 }
 318                 else if(stream_data_.bits_per_sample == 16 || (stream_data_.bits_per_sample == 24 && flac_cfg.output.resolution.normal.dither_24_to_16)) {
 319                         stream_data_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
 320                         stream_data_.sample_format_bytes_per_sample = 2;
 321                 }
 322                 else {
 323                         /*@@@ 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); */
 324                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", stream_data_.bits_per_sample);
 325                         safe_decoder_finish_(decoder_);
 326                         return;
 327                 }
 328         }
 329         FLAC__replaygain_synthesis__init_dither_context(&stream_data_.dither_context, stream_data_.sample_format_bytes_per_sample * 8, flac_cfg.output.resolution.replaygain.noise_shaping);
 330         stream_data_.is_playing = true;
 331
 332         if(flac_ip.output->open_audio(stream_data_.sample_format, stream_data_.sample_rate, stream_data_.channels) == 0) {
 333                 audio_error_ = true;
 334                 safe_decoder_finish_(decoder_);
 335                 return;
 336         }
 337
 338         stream_data_.title = flac_format_song_title(filename);
 339         flac_ip.set_info(stream_data_.title, stream_data_.length_in_msec, stream_data_.sample_rate * stream_data_.channels * stream_data_.bits_per_sample, stream_data_.sample_rate, stream_data_.channels);
 340
 341         stream_data_.seek_to_in_sec = -1;
 342         stream_data_.play_thread_open = true;
 343         pthread_create(&decode_thread_, NULL, play_loop_, NULL);
 344 }
 345
 346 void FLAC_XMMS__stop()
 347 {
 348         if(stream_data_.is_playing) {
 349                 stream_data_.is_playing = false;
 350                 if(stream_data_.play_thread_open) {
 351                         stream_data_.play_thread_open = false;
 352                         pthread_join(decode_thread_, NULL);
 353                 }
 354                 flac_ip.output->close_audio();
 355                 safe_decoder_finish_(decoder_);
 356         }
 357 }
 358
 359 void FLAC_XMMS__pause(short p)
 360 {
 361         flac_ip.output->pause(p);
 362 }
 363
 364 void FLAC_XMMS__seek(int time)
 365 {
 366         if(!stream_data_.is_http_source) {
 367                 stream_data_.seek_to_in_sec = time;
 368                 stream_data_.eof = false;
 369
 370                 while(stream_data_.seek_to_in_sec != -1)
 371                         xmms_usleep(10000);
 372         }
 373 }
 374
 375 int FLAC_XMMS__get_time()
 376 {
 377         if(audio_error_)
 378                 return -2;
 379         if(!stream_data_.is_playing || (stream_data_.eof && !flac_ip.output->buffer_playing()))
 380                 return -1;
 381         else
 382                 return flac_ip.output->output_time();
 383 }
 384
 385 void FLAC_XMMS__cleanup()
 386 {
 387         safe_decoder_delete_(decoder_);
 388         decoder_ = 0;
 389 }
 390
 391 void FLAC_XMMS__get_song_info(char *filename, char **title, int *length_in_msec)
 392 {
 393         FLAC__StreamMetadata streaminfo;
 394
 395         if(0 == filename)
 396                 filename = "";
 397
 398         if(!FLAC__metadata_get_streaminfo(filename, &streaminfo)) {
 399                 /* @@@ how to report the error? */
 400                 if(title) {
 401                         if (!is_http_source(filename)) {
 402                                 static const char *errtitle = "Invalid FLAC File: ";
 403                                 *title = g_malloc(strlen(errtitle) + 1 + strlen(filename) + 1 + 1);
 404                                 sprintf(*title, "%s\"%s\"", errtitle, filename);
 405                         } else {
 406                                 *title = NULL;
 407                         }
 408                 }
 409                 if(length_in_msec)
 410                         *length_in_msec = -1;
 411                 return;
 412         }
 413
 414         if(title) {
 415                 *title = flac_format_song_title(filename);
 416         }
 417         if(length_in_msec) {
 418                 FLAC__uint64 l = (FLAC__uint64)((double)streaminfo.data.stream_info.total_samples / (double)streaminfo.data.stream_info.sample_rate * 1000.0 + 0.5);
 419                 if (l > INT_MAX)
 420                         l = INT_MAX;
 421                 *length_in_msec = (int)l;
 422         }
 423 }
 424
 425 /***********************************************************************
 426  * local routines
 427  **********************************************************************/
 428
 429 void *play_loop_(void *arg)
 430 {
 431         unsigned written_time_last = 0, bh_index_last_w = 0, bh_index_last_o = BITRATE_HIST_SIZE, blocksize = 1;
 432         FLAC__uint64 decode_position_last = 0, decode_position_frame_last = 0, decode_position_frame = 0;
 433
 434         (void)arg;
 435
 436         while(stream_data_.is_playing) {
 437                 if(!stream_data_.eof) {
 438                         while(sample_buffer_last_ - sample_buffer_first_ < SAMPLES_PER_WRITE) {
 439                                 unsigned s;
 440
 441                                 s = sample_buffer_last_ - sample_buffer_first_;
 442                                 if(FLAC__stream_decoder_get_state(decoder_) == FLAC__STREAM_DECODER_END_OF_STREAM) {
 443                                         stream_data_.eof = true;
 444                                         break;
 445                                 }
 446                                 else if(!FLAC__stream_decoder_process_single(decoder_)) {
 447                                         /*@@@ this should probably be a dialog */
 448                                         fprintf(stderr, "libxmms-flac: READ ERROR processing frame\n");
 449                                         stream_data_.eof = true;
 450                                         break;
 451                                 }
 452                                 blocksize = sample_buffer_last_ - sample_buffer_first_ - s;
 453                                 decode_position_frame_last = decode_position_frame;
 454                                 if(stream_data_.is_http_source || !FLAC__stream_decoder_get_decode_position(decoder_, &decode_position_frame))
 455                                         decode_position_frame = 0;
 456                         }
 457                         if(sample_buffer_last_ - sample_buffer_first_ > 0) {
 458                                 const unsigned n = min(sample_buffer_last_ - sample_buffer_first_, SAMPLES_PER_WRITE);
 459                                 int bytes = n * stream_data_.channels * stream_data_.sample_format_bytes_per_sample;
 460                                 FLAC__byte *sample_buffer_start = sample_buffer_ + sample_buffer_first_ * stream_data_.channels * stream_data_.sample_format_bytes_per_sample;
 461                                 unsigned written_time, bh_index_w;
 462                                 FLAC__uint64 decode_position;
 463
 464                                 sample_buffer_first_ += n;
 465                                 flac_ip.add_vis_pcm(flac_ip.output->written_time(), stream_data_.sample_format, stream_data_.channels, bytes, sample_buffer_start);
 466                                 while(flac_ip.output->buffer_free() < (int)bytes && stream_data_.is_playing && stream_data_.seek_to_in_sec == -1)
 467                                         xmms_usleep(10000);
 468                                 if(stream_data_.is_playing && stream_data_.seek_to_in_sec == -1)
 469                                         flac_ip.output->write_audio(sample_buffer_start, bytes);
 470
 471                                 /* compute current bitrate */
 472
 473                                 written_time = flac_ip.output->written_time();
 474                                 bh_index_w = written_time / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 475                                 if(bh_index_w != bh_index_last_w) {
 476                                         bh_index_last_w = bh_index_w;
 477                                         decode_position = decode_position_frame - (double)(sample_buffer_last_ - sample_buffer_first_) * (double)(decode_position_frame - decode_position_frame_last) / (double)blocksize;
 478                                         bitrate_history_[(bh_index_w + BITRATE_HIST_SIZE - 1) % BITRATE_HIST_SIZE] =
 479                                                 decode_position > decode_position_last && written_time > written_time_last ?
 480                                                         8000 * (decode_position - decode_position_last) / (written_time - written_time_last) :
 481                                                         stream_data_.sample_rate * stream_data_.channels * stream_data_.bits_per_sample;
 482                                         decode_position_last = decode_position;
 483                                         written_time_last = written_time;
 484                                 }
 485                         }
 486                         else {
 487                                 stream_data_.eof = true;
 488                                 xmms_usleep(10000);
 489                         }
 490                 }
 491                 else
 492                         xmms_usleep(10000);
 493                 if(!stream_data_.is_http_source && stream_data_.seek_to_in_sec != -1) {
 494                         const double distance = (double)stream_data_.seek_to_in_sec * 1000.0 / (double)stream_data_.length_in_msec;
 495                         FLAC__uint64 target_sample = (FLAC__uint64)(distance * (double)stream_data_.total_samples);
 496                         if(stream_data_.total_samples > 0 && target_sample >= stream_data_.total_samples)
 497                                 target_sample = stream_data_.total_samples - 1;
 498                         if(FLAC__stream_decoder_seek_absolute(decoder_, target_sample)) {
 499                                 flac_ip.output->flush(stream_data_.seek_to_in_sec * 1000);
 500                                 bh_index_last_w = bh_index_last_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 501                                 if(!FLAC__stream_decoder_get_decode_position(decoder_, &decode_position_frame))
 502                                         decode_position_frame = 0;
 503                                 stream_data_.eof = false;
 504                                 sample_buffer_first_ = sample_buffer_last_ = 0;
 505                         }
 506                         else if(FLAC__stream_decoder_get_state(decoder_) == FLAC__STREAM_DECODER_SEEK_ERROR) {
 507                                 /*@@@ this should probably be a dialog */
 508                                 fprintf(stderr, "libxmms-flac: SEEK ERROR\n");
 509                                 FLAC__stream_decoder_flush(decoder_);
 510                                 stream_data_.eof = false;
 511                                 sample_buffer_first_ = sample_buffer_last_ = 0;
 512                         }
 513                         stream_data_.seek_to_in_sec = -1;
 514                 }
 515                 else {
 516                         /* display the right bitrate from history */
 517                         unsigned bh_index_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 518                         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) {
 519                                 bh_index_last_o = bh_index_o;
 520                                 flac_ip.set_info(stream_data_.title, stream_data_.length_in_msec, bitrate_history_[bh_index_o], stream_data_.sample_rate, stream_data_.channels);
 521                         }
 522                 }
 523         }
 524
 525         safe_decoder_finish_(decoder_);
 526
 527         /* are these two calls necessary? */
 528         flac_ip.output->buffer_free();
 529         flac_ip.output->buffer_free();
 530
 531         g_free(stream_data_.title);
 532
 533         pthread_exit(NULL);
 534         return 0; /* to silence the compiler warning about not returning a value */
 535 }
 536
 537 FLAC__bool safe_decoder_init_(const char *filename, FLAC__StreamDecoder *decoder)
 538 {
 539         if(decoder == 0)
 540                 return false;
 541
 542         safe_decoder_finish_(decoder);
 543
 544         FLAC__stream_decoder_set_md5_checking(decoder, false);
 545         FLAC__stream_decoder_set_metadata_ignore_all(decoder);
 546         FLAC__stream_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO);
 547         FLAC__stream_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_VORBIS_COMMENT);
 548         if(stream_data_.is_http_source) {
 549                 flac_http_open(filename, 0);
 550                 if(FLAC__stream_decoder_init_stream(decoder, http_read_callback_, /*seek_callback=*/0, /*tell_callback=*/0, /*length_callback=*/0, /*eof_callback=*/0, write_callback_, metadata_callback_, error_callback_, /*client_data=*/&stream_data_) != FLAC__STREAM_DECODER_INIT_STATUS_OK)
 551                         return false;
 552         }
 553         else {
 554                 if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, /*client_data=*/&stream_data_) != FLAC__STREAM_DECODER_INIT_STATUS_OK)
 555                         return false;
 556         }
 557
 558         if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder))
 559                 return false;
 560
 561         return true;
 562 }
 563
 564 void safe_decoder_finish_(FLAC__StreamDecoder *decoder)
 565 {
 566         if(decoder && FLAC__stream_decoder_get_state(decoder) != FLAC__STREAM_DECODER_UNINITIALIZED)
 567                 FLAC__stream_decoder_finish(decoder);
 568         if(stream_data_.is_http_source)
 569                 flac_http_close();
 570 }
 571
 572 void safe_decoder_delete_(FLAC__StreamDecoder *decoder)
 573 {
 574         if(decoder) {
 575                 safe_decoder_finish_(decoder);
 576                 FLAC__stream_decoder_delete(decoder);
 577         }
 578 }
 579
 580 FLAC__StreamDecoderReadStatus http_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data)
 581 {
 582         (void)decoder;
 583         (void)client_data;
 584         *bytes = flac_http_read(buffer, *bytes);
 585         return *bytes ? FLAC__STREAM_DECODER_READ_STATUS_CONTINUE : FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
 586 }
 587
 588 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
 589 {
 590         stream_data_struct *stream_data = (stream_data_struct *)client_data;
 591         const unsigned channels = stream_data->channels, wide_samples = frame->header.blocksize;
 592         const unsigned bits_per_sample = stream_data->bits_per_sample;
 593         FLAC__byte *sample_buffer_start;
 594
 595         (void)decoder;
 596
 597         if(stream_data->abort_flag)
 598                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 599
 600         if((sample_buffer_last_ + wide_samples) > (SAMPLE_BUFFER_SIZE / (channels * stream_data->sample_format_bytes_per_sample))) {
 601                 memmove(sample_buffer_, sample_buffer_ + sample_buffer_first_ * channels * stream_data->sample_format_bytes_per_sample, (sample_buffer_last_ - sample_buffer_first_) * channels * stream_data->sample_format_bytes_per_sample);
 602                 sample_buffer_last_ -= sample_buffer_first_;
 603                 sample_buffer_first_ = 0;
 604         }
 605         sample_buffer_start = sample_buffer_ + sample_buffer_last_ * channels * stream_data->sample_format_bytes_per_sample;
 606         if(stream_data->has_replaygain && flac_cfg.output.replaygain.enable) {
 607                 FLAC__replaygain_synthesis__apply_gain(
 608                                 sample_buffer_start,
 609                                 !is_big_endian_host_,
 610                                 stream_data->sample_format_bytes_per_sample == 1, /* unsigned_data_out */
 611                                 buffer,
 612                                 wide_samples,
 613                                 channels,
 614                                 bits_per_sample,
 615                                 stream_data->sample_format_bytes_per_sample * 8,
 616                                 stream_data->replay_scale,
 617                                 flac_cfg.output.replaygain.hard_limit,
 618                                 flac_cfg.output.resolution.replaygain.dither,
 619                                 &stream_data->dither_context
 620                 );
 621         }
 622         else if(is_big_endian_host_) {
 623                 FLAC__plugin_common__pack_pcm_signed_big_endian(
 624                         sample_buffer_start,
 625                         buffer,
 626                         wide_samples,
 627                         channels,
 628                         bits_per_sample,
 629                         stream_data->sample_format_bytes_per_sample * 8
 630                 );
 631         }
 632         else {
 633                 FLAC__plugin_common__pack_pcm_signed_little_endian(
 634                         sample_buffer_start,
 635                         buffer,
 636                         wide_samples,
 637                         channels,
 638                         bits_per_sample,
 639                         stream_data->sample_format_bytes_per_sample * 8
 640                 );
 641         }
 642
 643         sample_buffer_last_ += wide_samples;
 644
 645         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
 646 }
 647
 648 void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
 649 {
 650         stream_data_struct *stream_data = (stream_data_struct *)client_data;
 651         (void)decoder;
 652         if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
 653                 stream_data->total_samples = metadata->data.stream_info.total_samples;
 654                 stream_data->bits_per_sample = metadata->data.stream_info.bits_per_sample;
 655                 stream_data->channels = metadata->data.stream_info.channels;
 656                 stream_data->sample_rate = metadata->data.stream_info.sample_rate;
 657                 {
 658                         FLAC__uint64 l = (FLAC__uint64)((double)stream_data->total_samples / (double)stream_data->sample_rate * 1000.0 + 0.5);
 659                         if (l > INT_MAX)
 660                                 l = INT_MAX;
 661                         stream_data->length_in_msec = (int)l;
 662                 }
 663         }
 664         else if(metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
 665                 double reference, gain, peak;
 666                 if(grabbag__replaygain_load_from_vorbiscomment(metadata, flac_cfg.output.replaygain.album_mode, /*strict=*/false, &reference, &gain, &peak)) {
 667                         stream_data->has_replaygain = true;
 668                         stream_data->replay_scale = grabbag__replaygain_compute_scale_factor(peak, gain, (double)flac_cfg.output.replaygain.preamp, /*prevent_clipping=*/!flac_cfg.output.replaygain.hard_limit);
 669                 }
 670         }
 671 }
 672
 673 void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
 674 {
 675         stream_data_struct *stream_data = (stream_data_struct *)client_data;
 676         (void)decoder;
 677         if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
 678                 stream_data->abort_flag = true;
 679 }