src/plugin_xmms/plugin.c

   1 /* libxmms-flac - XMMS FLAC input plugin
   2  * Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007,2008,2009  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 along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include "plugin.h"
  20
  21 #include <limits.h>
  22 #include <pthread.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <stdio.h>
  26 #include <glib.h>
  27 #include <pwd.h>
  28 #include <sys/types.h>
  29 #include <unistd.h>
  30
  31 #include <xmms/plugin.h>
  32 #include <xmms/util.h>
  33 #include <xmms/configfile.h>
  34 #include <xmms/titlestring.h>
  35
  36 #ifdef HAVE_LANGINFO_CODESET
  37 #include <langinfo.h>
  38 #endif
  39
  40 #include "FLAC/all.h"
  41 #include "plugin_common/all.h"
  42 #include "share/grabbag.h"
  43 #include "share/replaygain_synthesis.h"
  44 #include "configure.h"
  45 #include "charset.h"
  46 #include "http.h"
  47 #include "tag.h"
  48
  49 #ifdef min
  50 #undef min
  51 #endif
  52 #define min(x,y) ((x)<(y)?(x):(y))
  53
  54 extern void FLAC_XMMS__file_info_box(char *filename);
  55
  56 typedef struct {
  57         FLAC__bool abort_flag;
  58         FLAC__bool is_playing;
  59         FLAC__bool is_http_source;
  60         FLAC__bool eof;
  61         FLAC__bool play_thread_open; /* if true, is_playing must also be true */
  62         FLAC__uint64 total_samples;
  63         unsigned bits_per_sample;
  64         unsigned channels;
  65         unsigned sample_rate;
  66         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 */
  67         gchar *title;
  68         AFormat sample_format;
  69         unsigned sample_format_bytes_per_sample;
  70         int seek_to_in_sec;
  71         FLAC__bool has_replaygain;
  72         double replay_scale;
  73         DitherContext dither_context;
  74 } stream_data_struct;
  75
  76 static void FLAC_XMMS__init(void);
  77 static int  FLAC_XMMS__is_our_file(char *filename);
  78 static void FLAC_XMMS__play_file(char *filename);
  79 static void FLAC_XMMS__stop(void);
  80 static void FLAC_XMMS__pause(short p);
  81 static void FLAC_XMMS__seek(int time);
  82 static int  FLAC_XMMS__get_time(void);
  83 static void FLAC_XMMS__cleanup(void);
  84 static void FLAC_XMMS__get_song_info(char *filename, char **title, int *length);
  85
  86 static void *play_loop_(void *arg);
  87
  88 static FLAC__bool safe_decoder_init_(const char *filename, FLAC__StreamDecoder *decoder);
  89 static void safe_decoder_finish_(FLAC__StreamDecoder *decoder);
  90 static void safe_decoder_delete_(FLAC__StreamDecoder *decoder);
  91
  92 static FLAC__StreamDecoderReadStatus http_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
  93 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
  94 static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
  95 static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
  96
  97 InputPlugin flac_ip =
  98 {
  99         NULL,
 100         NULL,
 101         "FLAC Player v" VERSION,
 102         FLAC_XMMS__init,
 103         FLAC_XMMS__aboutbox,
 104         FLAC_XMMS__configure,
 105         FLAC_XMMS__is_our_file,
 106         NULL,
 107         FLAC_XMMS__play_file,
 108         FLAC_XMMS__stop,
 109         FLAC_XMMS__pause,
 110         FLAC_XMMS__seek,
 111         NULL,
 112         FLAC_XMMS__get_time,
 113         NULL,
 114         NULL,
 115         FLAC_XMMS__cleanup,
 116         NULL,
 117         NULL,
 118         NULL,
 119         NULL,
 120         FLAC_XMMS__get_song_info,
 121         FLAC_XMMS__file_info_box,
 122         NULL
 123 };
 124
 125 #define SAMPLES_PER_WRITE 512
 126 #define SAMPLE_BUFFER_SIZE ((FLAC__MAX_BLOCK_SIZE + SAMPLES_PER_WRITE) * FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS * (24/8))
 127 static FLAC__byte sample_buffer_[SAMPLE_BUFFER_SIZE];
 128 static unsigned sample_buffer_first_, sample_buffer_last_;
 129
 130 static FLAC__StreamDecoder *decoder_ = 0;
 131 static stream_data_struct stream_data_;
 132 static pthread_t decode_thread_;
 133 static FLAC__bool audio_error_ = false;
 134 static FLAC__bool is_big_endian_host_;
 135
 136 #define BITRATE_HIST_SEGMENT_MSEC 500
 137 /* 500ms * 50 = 25s should be enough */
 138 #define BITRATE_HIST_SIZE 50
 139 static unsigned bitrate_history_[BITRATE_HIST_SIZE];
 140
 141
 142 InputPlugin *get_iplugin_info(void)
 143 {
 144         flac_ip.description = g_strdup_printf("Reference FLAC Player v%s", FLAC__VERSION_STRING);
 145         return &flac_ip;
 146 }
 147
 148 void set_track_info(const char* title, int length_in_msec)
 149 {
 150         if (stream_data_.is_playing) {
 151                 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);
 152         }
 153 }
 154
 155 static gchar* homedir(void)
 156 {
 157         gchar *result;
 158         char *env_home = getenv("HOME");
 159         if (env_home) {
 160                 result = g_strdup (env_home);
 161         } else {
 162                 uid_t uid = getuid();
 163                 struct passwd *pwent;
 164                 do {
 165                         pwent = getpwent();
 166                 } while (pwent && pwent->pw_uid != uid);
 167                 result = pwent ? g_strdup (pwent->pw_dir) : NULL;
 168                 endpwent();
 169         }
 170         return result;
 171 }
 172
 173 static FLAC__bool is_http_source(const char *source)
 174 {
 175         return 0 == strncasecmp(source, "http://", 7);
 176 }
 177
 178 void FLAC_XMMS__init(void)
 179 {
 180         ConfigFile *cfg;
 181         FLAC__uint32 test = 1;
 182
 183         is_big_endian_host_ = (*((FLAC__byte*)(&test)))? false : true;
 184
 185         flac_cfg.title.tag_override = FALSE;
 186         if (flac_cfg.title.tag_format)
 187                 g_free(flac_cfg.title.tag_format);
 188         flac_cfg.title.convert_char_set = FALSE;
 189
 190         cfg = xmms_cfg_open_default_file();
 191
 192         /* title */
 193
 194         xmms_cfg_read_boolean(cfg, "flac", "title.tag_override", &flac_cfg.title.tag_override);
 195
 196         if(!xmms_cfg_read_string(cfg, "flac", "title.tag_format", &flac_cfg.title.tag_format))
 197                 flac_cfg.title.tag_format = g_strdup("%p - %t");
 198
 199         xmms_cfg_read_boolean(cfg, "flac", "title.convert_char_set", &flac_cfg.title.convert_char_set);
 200
 201         if(!xmms_cfg_read_string(cfg, "flac", "title.user_char_set", &flac_cfg.title.user_char_set))
 202                 flac_cfg.title.user_char_set = FLAC_plugin__charset_get_current();
 203
 204         /* replaygain */
 205
 206         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.enable", &flac_cfg.output.replaygain.enable);
 207
 208         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.album_mode", &flac_cfg.output.replaygain.album_mode);
 209
 210         if(!xmms_cfg_read_int(cfg, "flac", "output.replaygain.preamp", &flac_cfg.output.replaygain.preamp))
 211                 flac_cfg.output.replaygain.preamp = 0;
 212
 213         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.hard_limit", &flac_cfg.output.replaygain.hard_limit);
 214
 215         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.normal.dither_24_to_16", &flac_cfg.output.resolution.normal.dither_24_to_16);
 216         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.replaygain.dither", &flac_cfg.output.resolution.replaygain.dither);
 217
 218         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.noise_shaping", &flac_cfg.output.resolution.replaygain.noise_shaping))
 219                 flac_cfg.output.resolution.replaygain.noise_shaping = 1;
 220
 221         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.bps_out", &flac_cfg.output.resolution.replaygain.bps_out))
 222                 flac_cfg.output.resolution.replaygain.bps_out = 16;
 223
 224         /* stream */
 225
 226         xmms_cfg_read_int(cfg, "flac", "stream.http_buffer_size", &flac_cfg.stream.http_buffer_size);
 227         xmms_cfg_read_int(cfg, "flac", "stream.http_prebuffer", &flac_cfg.stream.http_prebuffer);
 228         xmms_cfg_read_boolean(cfg, "flac", "stream.use_proxy", &flac_cfg.stream.use_proxy);
 229         if(flac_cfg.stream.proxy_host)
 230                 g_free(flac_cfg.stream.proxy_host);
 231         if(!xmms_cfg_read_string(cfg, "flac", "stream.proxy_host", &flac_cfg.stream.proxy_host))
 232                 flac_cfg.stream.proxy_host = g_strdup("");
 233         xmms_cfg_read_int(cfg, "flac", "stream.proxy_port", &flac_cfg.stream.proxy_port);
 234         xmms_cfg_read_boolean(cfg, "flac", "stream.proxy_use_auth", &flac_cfg.stream.proxy_use_auth);
 235         if(flac_cfg.stream.proxy_user)
 236                 g_free(flac_cfg.stream.proxy_user);
 237         flac_cfg.stream.proxy_user = NULL;
 238         xmms_cfg_read_string(cfg, "flac", "stream.proxy_user", &flac_cfg.stream.proxy_user);
 239         if(flac_cfg.stream.proxy_pass)
 240                 g_free(flac_cfg.stream.proxy_pass);
 241         flac_cfg.stream.proxy_pass = NULL;
 242         xmms_cfg_read_string(cfg, "flac", "stream.proxy_pass", &flac_cfg.stream.proxy_pass);
 243         xmms_cfg_read_boolean(cfg, "flac", "stream.save_http_stream", &flac_cfg.stream.save_http_stream);
 244         if (flac_cfg.stream.save_http_path)
 245                 g_free (flac_cfg.stream.save_http_path);
 246         if (!xmms_cfg_read_string(cfg, "flac", "stream.save_http_path", &flac_cfg.stream.save_http_path) || ! *flac_cfg.stream.save_http_path) {
 247                 if (flac_cfg.stream.save_http_path)
 248                         g_free (flac_cfg.stream.save_http_path);
 249                 flac_cfg.stream.save_http_path = homedir();
 250         }
 251         xmms_cfg_read_boolean(cfg, "flac", "stream.cast_title_streaming", &flac_cfg.stream.cast_title_streaming);
 252         xmms_cfg_read_boolean(cfg, "flac", "stream.use_udp_channel", &flac_cfg.stream.use_udp_channel);
 253
 254         decoder_ = FLAC__stream_decoder_new();
 255
 256         xmms_cfg_free(cfg);
 257 }
 258
 259 int FLAC_XMMS__is_our_file(char *filename)
 260 {
 261         char *ext;
 262
 263         ext = strrchr(filename, '.');
 264         if(ext)
 265                 if(!strcasecmp(ext, ".flac") || !strcasecmp(ext, ".fla"))
 266                         return 1;
 267         return 0;
 268 }
 269
 270 void FLAC_XMMS__play_file(char *filename)
 271 {
 272         FILE *f;
 273
 274         sample_buffer_first_ = sample_buffer_last_ = 0;
 275         audio_error_ = false;
 276         stream_data_.abort_flag = false;
 277         stream_data_.is_playing = false;
 278         stream_data_.is_http_source = is_http_source(filename);
 279         stream_data_.eof = false;
 280         stream_data_.play_thread_open = false;
 281         stream_data_.has_replaygain = false;
 282
 283         if(!is_http_source(filename)) {
 284                 if(0 == (f = fopen(filename, "r")))
 285                         return;
 286                 fclose(f);
 287         }
 288
 289         if(decoder_ == 0)
 290                 return;
 291
 292         if(!safe_decoder_init_(filename, decoder_))
 293                 return;
 294
 295         if(stream_data_.has_replaygain && flac_cfg.output.replaygain.enable) {
 296                 if(flac_cfg.output.resolution.replaygain.bps_out == 8) {
 297                         stream_data_.sample_format = FMT_U8;
 298                         stream_data_.sample_format_bytes_per_sample = 1;
 299                 }
 300                 else if(flac_cfg.output.resolution.replaygain.bps_out == 16) {
 301                         stream_data_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
 302                         stream_data_.sample_format_bytes_per_sample = 2;
 303                 }
 304                 else {
 305                         /*@@@ 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); */
 306                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", flac_cfg.output.resolution.replaygain.bps_out);
 307                         safe_decoder_finish_(decoder_);
 308                         return;
 309                 }
 310         }
 311         else {
 312                 if(stream_data_.bits_per_sample == 8) {
 313                         stream_data_.sample_format = FMT_U8;
 314                         stream_data_.sample_format_bytes_per_sample = 1;
 315                 }
 316                 else if(stream_data_.bits_per_sample == 16 || (stream_data_.bits_per_sample == 24 && flac_cfg.output.resolution.normal.dither_24_to_16)) {
 317                         stream_data_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
 318                         stream_data_.sample_format_bytes_per_sample = 2;
 319                 }
 320                 else {
 321                         /*@@@ 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); */
 322                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", stream_data_.bits_per_sample);
 323                         safe_decoder_finish_(decoder_);
 324                         return;
 325                 }
 326         }
 327         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);
 328         stream_data_.is_playing = true;
 329
 330         if(flac_ip.output->open_audio(stream_data_.sample_format, stream_data_.sample_rate, stream_data_.channels) == 0) {
 331                 audio_error_ = true;
 332                 safe_decoder_finish_(decoder_);
 333                 return;
 334         }
 335
 336         stream_data_.title = flac_format_song_title(filename);
 337         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);
 338
 339         stream_data_.seek_to_in_sec = -1;
 340         stream_data_.play_thread_open = true;
 341         pthread_create(&decode_thread_, NULL, play_loop_, NULL);
 342 }
 343
 344 void FLAC_XMMS__stop(void)
 345 {
 346         if(stream_data_.is_playing) {
 347                 stream_data_.is_playing = false;
 348                 if(stream_data_.play_thread_open) {
 349                         stream_data_.play_thread_open = false;
 350                         pthread_join(decode_thread_, NULL);
 351                 }
 352                 flac_ip.output->close_audio();
 353                 safe_decoder_finish_(decoder_);
 354         }
 355 }
 356
 357 void FLAC_XMMS__pause(short p)
 358 {
 359         flac_ip.output->pause(p);
 360 }
 361
 362 void FLAC_XMMS__seek(int time)
 363 {
 364         if(!stream_data_.is_http_source) {
 365                 stream_data_.seek_to_in_sec = time;
 366                 stream_data_.eof = false;
 367
 368                 while(stream_data_.seek_to_in_sec != -1)
 369                         xmms_usleep(10000);
 370         }
 371 }
 372
 373 int FLAC_XMMS__get_time(void)
 374 {
 375         if(audio_error_)
 376                 return -2;
 377         if(!stream_data_.is_playing || (stream_data_.eof && !flac_ip.output->buffer_playing()))
 378                 return -1;
 379         else
 380                 return flac_ip.output->output_time();
 381 }
 382
 383 void FLAC_XMMS__cleanup(void)
 384 {
 385         safe_decoder_delete_(decoder_);
 386         decoder_ = 0;
 387 }
 388
 389 void FLAC_XMMS__get_song_info(char *filename, char **title, int *length_in_msec)
 390 {
 391         FLAC__StreamMetadata streaminfo;
 392
 393         if(0 == filename)
 394                 filename = "";
 395
 396         if(!FLAC__metadata_get_streaminfo(filename, &streaminfo)) {
 397                 /* @@@ how to report the error? */
 398                 if(title) {
 399                         if (!is_http_source(filename)) {
 400                                 static const char *errtitle = "Invalid FLAC File: ";
 401                                 if(strlen(errtitle) + 1 + strlen(filename) + 1 + 1 < strlen(filename)) { /* overflow check */
 402                                         *title = NULL;
 403                                 }
 404                                 else {
 405                                         size_t len = strlen(errtitle) + 1 + strlen(filename) + 1 + 1;
 406                                         *title = g_malloc(len);
 407                                         flac_snprintf(*title, len, "%s\"%s\"", errtitle, filename);
 408                                 }
 409                         } else {
 410                                 *title = NULL;
 411                         }
 412                 }
 413                 if(length_in_msec)
 414                         *length_in_msec = -1;
 415                 return;
 416         }
 417
 418         if(title) {
 419                 *title = flac_format_song_title(filename);
 420         }
 421         if(length_in_msec) {
 422                 FLAC__uint64 l = (FLAC__uint64)((double)streaminfo.data.stream_info.total_samples / (double)streaminfo.data.stream_info.sample_rate * 1000.0 + 0.5);
 423                 if (l > INT_MAX)
 424                         l = INT_MAX;
 425                 *length_in_msec = (int)l;
 426         }
 427 }
 428
 429 /***********************************************************************
 430  * local routines
 431  **********************************************************************/
 432
 433 void *play_loop_(void *arg)
 434 {
 435         unsigned written_time_last = 0, bh_index_last_w = 0, bh_index_last_o = BITRATE_HIST_SIZE, blocksize = 1;
 436         FLAC__uint64 decode_position_last = 0, decode_position_frame_last = 0, decode_position_frame = 0;
 437
 438         (void)arg;
 439
 440         while(stream_data_.is_playing) {
 441                 if(!stream_data_.eof) {
 442                         while(sample_buffer_last_ - sample_buffer_first_ < SAMPLES_PER_WRITE) {
 443                                 unsigned s;
 444
 445                                 s = sample_buffer_last_ - sample_buffer_first_;
 446                                 if(FLAC__stream_decoder_get_state(decoder_) == FLAC__STREAM_DECODER_END_OF_STREAM) {
 447                                         stream_data_.eof = true;
 448                                         break;
 449                                 }
 450                                 else if(!FLAC__stream_decoder_process_single(decoder_)) {
 451                                         /*@@@ this should probably be a dialog */
 452                                         fprintf(stderr, "libxmms-flac: READ ERROR processing frame\n");
 453                                         stream_data_.eof = true;
 454                                         break;
 455                                 }
 456                                 blocksize = sample_buffer_last_ - sample_buffer_first_ - s;
 457                                 decode_position_frame_last = decode_position_frame;
 458                                 if(stream_data_.is_http_source || !FLAC__stream_decoder_get_decode_position(decoder_, &decode_position_frame))
 459                                         decode_position_frame = 0;
 460                         }
 461                         if(sample_buffer_last_ - sample_buffer_first_ > 0) {
 462                                 const unsigned n = min(sample_buffer_last_ - sample_buffer_first_, SAMPLES_PER_WRITE);
 463                                 int bytes = n * stream_data_.channels * stream_data_.sample_format_bytes_per_sample;
 464                                 FLAC__byte *sample_buffer_start = sample_buffer_ + sample_buffer_first_ * stream_data_.channels * stream_data_.sample_format_bytes_per_sample;
 465                                 unsigned written_time, bh_index_w;
 466                                 FLAC__uint64 decode_position;
 467
 468                                 sample_buffer_first_ += n;
 469                                 flac_ip.add_vis_pcm(flac_ip.output->written_time(), stream_data_.sample_format, stream_data_.channels, bytes, sample_buffer_start);
 470                                 while(flac_ip.output->buffer_free() < (int)bytes && stream_data_.is_playing && stream_data_.seek_to_in_sec == -1)
 471                                         xmms_usleep(10000);
 472                                 if(stream_data_.is_playing && stream_data_.seek_to_in_sec == -1)
 473                                         flac_ip.output->write_audio(sample_buffer_start, bytes);
 474
 475                                 /* compute current bitrate */
 476
 477                                 written_time = flac_ip.output->written_time();
 478                                 bh_index_w = written_time / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 479                                 if(bh_index_w != bh_index_last_w) {
 480                                         bh_index_last_w = bh_index_w;
 481                                         decode_position = decode_position_frame - (double)(sample_buffer_last_ - sample_buffer_first_) * (double)(decode_position_frame - decode_position_frame_last) / (double)blocksize;
 482                                         bitrate_history_[(bh_index_w + BITRATE_HIST_SIZE - 1) % BITRATE_HIST_SIZE] =
 483                                                 decode_position > decode_position_last && written_time > written_time_last ?
 484                                                         8000 * (decode_position - decode_position_last) / (written_time - written_time_last) :
 485                                                         stream_data_.sample_rate * stream_data_.channels * stream_data_.bits_per_sample;
 486                                         decode_position_last = decode_position;
 487                                         written_time_last = written_time;
 488                                 }
 489                         }
 490                         else {
 491                                 stream_data_.eof = true;
 492                                 xmms_usleep(10000);
 493                         }
 494                 }
 495                 else
 496                         xmms_usleep(10000);
 497                 if(!stream_data_.is_http_source && stream_data_.seek_to_in_sec != -1) {
 498                         const double distance = (double)stream_data_.seek_to_in_sec * 1000.0 / (double)stream_data_.length_in_msec;
 499                         FLAC__uint64 target_sample = (FLAC__uint64)(distance * (double)stream_data_.total_samples);
 500                         if(stream_data_.total_samples > 0 && target_sample >= stream_data_.total_samples)
 501                                 target_sample = stream_data_.total_samples - 1;
 502                         if(FLAC__stream_decoder_seek_absolute(decoder_, target_sample)) {
 503                                 flac_ip.output->flush(stream_data_.seek_to_in_sec * 1000);
 504                                 bh_index_last_w = bh_index_last_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 505                                 if(!FLAC__stream_decoder_get_decode_position(decoder_, &decode_position_frame))
 506                                         decode_position_frame = 0;
 507                                 stream_data_.eof = false;
 508                                 sample_buffer_first_ = sample_buffer_last_ = 0;
 509                         }
 510                         else if(FLAC__stream_decoder_get_state(decoder_) == FLAC__STREAM_DECODER_SEEK_ERROR) {
 511                                 /*@@@ this should probably be a dialog */
 512                                 fprintf(stderr, "libxmms-flac: SEEK ERROR\n");
 513                                 FLAC__stream_decoder_flush(decoder_);
 514                                 stream_data_.eof = false;
 515                                 sample_buffer_first_ = sample_buffer_last_ = 0;
 516                         }
 517                         stream_data_.seek_to_in_sec = -1;
 518                 }
 519                 else {
 520                         /* display the right bitrate from history */
 521                         unsigned bh_index_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 522                         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) {
 523                                 bh_index_last_o = bh_index_o;
 524                                 flac_ip.set_info(stream_data_.title, stream_data_.length_in_msec, bitrate_history_[bh_index_o], stream_data_.sample_rate, stream_data_.channels);
 525                         }
 526                 }
 527         }
 528
 529         safe_decoder_finish_(decoder_);
 530
 531         /* are these two calls necessary? */
 532         flac_ip.output->buffer_free();
 533         flac_ip.output->buffer_free();
 534
 535         g_free(stream_data_.title);
 536
 537         pthread_exit(NULL);
 538         return 0; /* to silence the compiler warning about not returning a value */
 539 }
 540
 541 FLAC__bool safe_decoder_init_(const char *filename, FLAC__StreamDecoder *decoder)
 542 {
 543         if(decoder == 0)
 544                 return false;
 545
 546         safe_decoder_finish_(decoder);
 547
 548         FLAC__stream_decoder_set_md5_checking(decoder, false);
 549         FLAC__stream_decoder_set_metadata_ignore_all(decoder);
 550         FLAC__stream_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO);
 551         FLAC__stream_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_VORBIS_COMMENT);
 552         if(stream_data_.is_http_source) {
 553                 flac_http_open(filename, 0);
 554                 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)
 555                         return false;
 556         }
 557         else {
 558                 if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, /*client_data=*/&stream_data_) != FLAC__STREAM_DECODER_INIT_STATUS_OK)
 559                         return false;
 560         }
 561
 562         if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder))
 563                 return false;
 564
 565         return true;
 566 }
 567
 568 void safe_decoder_finish_(FLAC__StreamDecoder *decoder)
 569 {
 570         if(decoder && FLAC__stream_decoder_get_state(decoder) != FLAC__STREAM_DECODER_UNINITIALIZED)
 571                 (void)FLAC__stream_decoder_finish(decoder);
 572         if(stream_data_.is_http_source)
 573                 flac_http_close();
 574 }
 575
 576 void safe_decoder_delete_(FLAC__StreamDecoder *decoder)
 577 {
 578         if(decoder) {
 579                 safe_decoder_finish_(decoder);
 580                 FLAC__stream_decoder_delete(decoder);
 581         }
 582 }
 583
 584 FLAC__StreamDecoderReadStatus http_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
 585 {
 586         (void)decoder;
 587         (void)client_data;
 588         *bytes = flac_http_read(buffer, *bytes);
 589         return *bytes ? FLAC__STREAM_DECODER_READ_STATUS_CONTINUE : FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
 590 }
 591
 592 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
 593 {
 594         stream_data_struct *stream_data = (stream_data_struct *)client_data;
 595         const unsigned channels = stream_data->channels, wide_samples = frame->header.blocksize;
 596         const unsigned bits_per_sample = stream_data->bits_per_sample;
 597         FLAC__byte *sample_buffer_start;
 598
 599         (void)decoder;
 600
 601         if(stream_data->abort_flag)
 602                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 603
 604         if((sample_buffer_last_ + wide_samples) > (SAMPLE_BUFFER_SIZE / (channels * stream_data->sample_format_bytes_per_sample))) {
 605                 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);
 606                 sample_buffer_last_ -= sample_buffer_first_;
 607                 sample_buffer_first_ = 0;
 608         }
 609         sample_buffer_start = sample_buffer_ + sample_buffer_last_ * channels * stream_data->sample_format_bytes_per_sample;
 610         if(stream_data->has_replaygain && flac_cfg.output.replaygain.enable) {
 611                 FLAC__replaygain_synthesis__apply_gain(
 612                                 sample_buffer_start,
 613                                 !is_big_endian_host_,
 614                                 stream_data->sample_format_bytes_per_sample == 1, /* unsigned_data_out */
 615                                 buffer,
 616                                 wide_samples,
 617                                 channels,
 618                                 bits_per_sample,
 619                                 stream_data->sample_format_bytes_per_sample * 8,
 620                                 stream_data->replay_scale,
 621                                 flac_cfg.output.replaygain.hard_limit,
 622                                 flac_cfg.output.resolution.replaygain.dither,
 623                                 &stream_data->dither_context
 624                 );
 625         }
 626         else if(is_big_endian_host_) {
 627                 FLAC__plugin_common__pack_pcm_signed_big_endian(
 628                         sample_buffer_start,
 629                         buffer,
 630                         wide_samples,
 631                         channels,
 632                         bits_per_sample,
 633                         stream_data->sample_format_bytes_per_sample * 8
 634                 );
 635         }
 636         else {
 637                 FLAC__plugin_common__pack_pcm_signed_little_endian(
 638                         sample_buffer_start,
 639                         buffer,
 640                         wide_samples,
 641                         channels,
 642                         bits_per_sample,
 643                         stream_data->sample_format_bytes_per_sample * 8
 644                 );
 645         }
 646
 647         sample_buffer_last_ += wide_samples;
 648
 649         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
 650 }
 651
 652 void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
 653 {
 654         stream_data_struct *stream_data = (stream_data_struct *)client_data;
 655         (void)decoder;
 656         if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
 657                 stream_data->total_samples = metadata->data.stream_info.total_samples;
 658                 stream_data->bits_per_sample = metadata->data.stream_info.bits_per_sample;
 659                 stream_data->channels = metadata->data.stream_info.channels;
 660                 stream_data->sample_rate = metadata->data.stream_info.sample_rate;
 661                 {
 662                         FLAC__uint64 l = (FLAC__uint64)((double)stream_data->total_samples / (double)stream_data->sample_rate * 1000.0 + 0.5);
 663                         if (l > INT_MAX)
 664                                 l = INT_MAX;
 665                         stream_data->length_in_msec = (int)l;
 666                 }
 667         }
 668         else if(metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
 669                 double reference, gain, peak;
 670                 if(grabbag__replaygain_load_from_vorbiscomment(metadata, flac_cfg.output.replaygain.album_mode, /*strict=*/false, &reference, &gain, &peak)) {
 671                         stream_data->has_replaygain = true;
 672                         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);
 673                 }
 674         }
 675 }
 676
 677 void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
 678 {
 679         stream_data_struct *stream_data = (stream_data_struct *)client_data;
 680         (void)decoder;
 681         if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
 682                 stream_data->abort_flag = true;
 683 }