src/plugin_xmms/plugin.c

   1 /* libxmms-flac - XMMS FLAC input plugin
   2  * Copyright (C) 2000,2001,2002,2003,2004,2005  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 #include <pwd.h>
  25 #include <sys/types.h>
  26 #include <unistd.h>
  27
  28 #include <xmms/plugin.h>
  29 #include <xmms/util.h>
  30 #include <xmms/configfile.h>
  31 #include <xmms/titlestring.h>
  32
  33 #ifdef HAVE_CONFIG_H
  34 #include <config.h>
  35 #endif
  36
  37 #ifdef HAVE_LANGINFO_CODESET
  38 #include <langinfo.h>
  39 #endif
  40
  41 #include "FLAC/all.h"
  42 #include "plugin_common/all.h"
  43 #include "share/grabbag.h"
  44 #include "share/replaygain_synthesis.h"
  45 #include "configure.h"
  46 #include "charset.h"
  47 #include "http.h"
  48 #include "tag.h"
  49
  50 #ifdef min
  51 #undef min
  52 #endif
  53 #define min(x,y) ((x)<(y)?(x):(y))
  54
  55 /* adjust for compilers that can't understand using LLU suffix for uint64_t literals */
  56 #ifdef _MSC_VER
  57 #define FLAC__U64L(x) x
  58 #else
  59 #define FLAC__U64L(x) x##LLU
  60 #endif
  61
  62 extern void FLAC_XMMS__file_info_box(char *filename);
  63
  64 typedef struct {
  65         FLAC__bool abort_flag;
  66         FLAC__bool is_playing;
  67         FLAC__bool eof;
  68         FLAC__bool play_thread_open; /* if true, is_playing must also be true */
  69         unsigned total_samples;
  70         unsigned bits_per_sample;
  71         unsigned channels;
  72         unsigned sample_rate;
  73         unsigned length_in_msec;
  74         gchar *title;
  75         AFormat sample_format;
  76         unsigned sample_format_bytes_per_sample;
  77         int seek_to_in_sec;
  78         FLAC__bool has_replaygain;
  79         double replay_scale;
  80         DitherContext dither_context;
  81 } file_info_struct;
  82
  83 typedef FLAC__StreamDecoderWriteStatus (*WriteCallback) (const void *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
  84 typedef void (*MetadataCallback) (const void *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
  85 typedef void (*ErrorCallback) (const void *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
  86
  87 typedef struct {
  88         FLAC__bool seekable;
  89         void* (*new_decoder) (void);
  90         FLAC__bool (*set_md5_checking) (void *decoder, FLAC__bool value);
  91         FLAC__bool (*set_source) (void *decoder, const char* source);
  92         FLAC__bool (*set_metadata_ignore_all) (void *decoder);
  93         FLAC__bool (*set_metadata_respond) (void *decoder, FLAC__MetadataType type);
  94         FLAC__bool (*set_write_callback) (void *decoder, WriteCallback value);
  95         FLAC__bool (*set_metadata_callback) (void *decoder, MetadataCallback value);
  96         FLAC__bool (*set_error_callback) (void *decoder, ErrorCallback value);
  97         FLAC__bool (*set_client_data) (void *decoder, void *value);
  98         FLAC__bool (*decoder_init) (void *decoder);
  99         void (*safe_decoder_finish) (void *decoder);
 100         void (*safe_decoder_delete) (void *decoder);
 101         FLAC__bool (*process_until_end_of_metadata) (void *decoder);
 102         FLAC__bool (*process_single) (void *decoder);
 103         FLAC__bool (*is_eof) (void *decoder);
 104 } decoder_funcs_t;
 105
 106 #define NUM_DECODER_TYPES 2
 107 typedef enum {
 108         DECODER_FILE,
 109         DECODER_HTTP
 110 } decoder_t;
 111
 112 static void FLAC_XMMS__init();
 113 static int  FLAC_XMMS__is_our_file(char *filename);
 114 static void FLAC_XMMS__play_file(char *filename);
 115 static void FLAC_XMMS__stop();
 116 static void FLAC_XMMS__pause(short p);
 117 static void FLAC_XMMS__seek(int time);
 118 static int  FLAC_XMMS__get_time();
 119 static void FLAC_XMMS__cleanup();
 120 static void FLAC_XMMS__get_song_info(char *filename, char **title, int *length);
 121
 122 static void *play_loop_(void *arg);
 123
 124 static FLAC__bool safe_decoder_init_(const char *filename, void **decoderp, decoder_funcs_t const ** fnsp);
 125 static void file_decoder_safe_decoder_finish_(void *decoder);
 126 static void file_decoder_safe_decoder_delete_(void *decoder);
 127 static FLAC__StreamDecoderWriteStatus write_callback_(const void *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
 128 static void metadata_callback_(const void *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
 129 static void error_callback_(const void *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
 130
 131 static void init_decoder_func_tables();
 132 static decoder_t source_to_decoder_type (const char *source);
 133
 134 InputPlugin flac_ip =
 135 {
 136         NULL,
 137         NULL,
 138         "FLAC Player v" VERSION,
 139         FLAC_XMMS__init,
 140         FLAC_XMMS__aboutbox,
 141         FLAC_XMMS__configure,
 142         FLAC_XMMS__is_our_file,
 143         NULL,
 144         FLAC_XMMS__play_file,
 145         FLAC_XMMS__stop,
 146         FLAC_XMMS__pause,
 147         FLAC_XMMS__seek,
 148         NULL,
 149         FLAC_XMMS__get_time,
 150         NULL,
 151         NULL,
 152         FLAC_XMMS__cleanup,
 153         NULL,
 154         NULL,
 155         NULL,
 156         NULL,
 157         FLAC_XMMS__get_song_info,
 158         FLAC_XMMS__file_info_box,
 159         NULL
 160 };
 161
 162 #define SAMPLES_PER_WRITE 512
 163 #define SAMPLE_BUFFER_SIZE ((FLAC__MAX_BLOCK_SIZE + SAMPLES_PER_WRITE) * FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS * (24/8))
 164 static FLAC__byte sample_buffer_[SAMPLE_BUFFER_SIZE];
 165 static unsigned sample_buffer_first_, sample_buffer_last_;
 166
 167 static void *decoder_ = 0;
 168 static file_info_struct file_info_;
 169 static pthread_t decode_thread_;
 170 static FLAC__bool audio_error_ = false;
 171 static FLAC__bool is_big_endian_host_;
 172
 173 #define BITRATE_HIST_SEGMENT_MSEC 500
 174 /* 500ms * 50 = 25s should be enough */
 175 #define BITRATE_HIST_SIZE 50
 176 static unsigned bitrate_history_[BITRATE_HIST_SIZE];
 177
 178 /* A table of sets of decoder functions, indexed by decoder_t */
 179 static const decoder_funcs_t* DECODER_FUNCS[NUM_DECODER_TYPES];
 180
 181 static decoder_funcs_t const * decoder_func_table_;
 182
 183
 184 InputPlugin *get_iplugin_info()
 185 {
 186         flac_ip.description = g_strdup_printf("Reference FLAC Player v%s", FLAC__VERSION_STRING);
 187         return &flac_ip;
 188 }
 189
 190 void set_track_info(const char* title, int length_in_msec)
 191 {
 192         if (file_info_.is_playing) {
 193                 flac_ip.set_info((char*) title, length_in_msec, file_info_.sample_rate * file_info_.channels * file_info_.bits_per_sample, file_info_.sample_rate, file_info_.channels);
 194         }
 195 }
 196
 197 static gchar* homedir()
 198 {
 199         gchar *result;
 200         char *env_home = getenv("HOME");
 201         if (env_home) {
 202                 result = g_strdup (env_home);
 203         } else {
 204                 uid_t uid = getuid();
 205                 struct passwd *pwent;
 206                 do {
 207                         pwent = getpwent();
 208                 } while (pwent && pwent->pw_uid != uid);
 209                 result = pwent ? g_strdup (pwent->pw_dir) : NULL;
 210                 endpwent();
 211         }
 212         return result;
 213 }
 214
 215 void FLAC_XMMS__init()
 216 {
 217         ConfigFile *cfg;
 218         FLAC__uint32 test = 1;
 219
 220         is_big_endian_host_ = (*((FLAC__byte*)(&test)))? false : true;
 221
 222         flac_cfg.title.tag_override = FALSE;
 223         if (flac_cfg.title.tag_format)
 224                 g_free(flac_cfg.title.tag_format);
 225         flac_cfg.title.convert_char_set = FALSE;
 226
 227         cfg = xmms_cfg_open_default_file();
 228
 229         /* title */
 230
 231         xmms_cfg_read_boolean(cfg, "flac", "title.tag_override", &flac_cfg.title.tag_override);
 232
 233         if(!xmms_cfg_read_string(cfg, "flac", "title.tag_format", &flac_cfg.title.tag_format))
 234                 flac_cfg.title.tag_format = g_strdup("%p - %t");
 235
 236         xmms_cfg_read_boolean(cfg, "flac", "title.convert_char_set", &flac_cfg.title.convert_char_set);
 237
 238         if(!xmms_cfg_read_string(cfg, "flac", "title.user_char_set", &flac_cfg.title.user_char_set))
 239                 flac_cfg.title.user_char_set = FLAC_plugin__charset_get_current();
 240
 241         /* replaygain */
 242
 243         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.enable", &flac_cfg.output.replaygain.enable);
 244
 245         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.album_mode", &flac_cfg.output.replaygain.album_mode);
 246
 247         if(!xmms_cfg_read_int(cfg, "flac", "output.replaygain.preamp", &flac_cfg.output.replaygain.preamp))
 248                 flac_cfg.output.replaygain.preamp = 0;
 249
 250         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.hard_limit", &flac_cfg.output.replaygain.hard_limit);
 251
 252         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.normal.dither_24_to_16", &flac_cfg.output.resolution.normal.dither_24_to_16);
 253         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.replaygain.dither", &flac_cfg.output.resolution.replaygain.dither);
 254
 255         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.noise_shaping", &flac_cfg.output.resolution.replaygain.noise_shaping))
 256                 flac_cfg.output.resolution.replaygain.noise_shaping = 1;
 257
 258         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.bps_out", &flac_cfg.output.resolution.replaygain.bps_out))
 259                 flac_cfg.output.resolution.replaygain.bps_out = 16;
 260
 261         /* stream */
 262
 263         xmms_cfg_read_int(cfg, "flac", "stream.http_buffer_size", &flac_cfg.stream.http_buffer_size);
 264         xmms_cfg_read_int(cfg, "flac", "stream.http_prebuffer", &flac_cfg.stream.http_prebuffer);
 265         xmms_cfg_read_boolean(cfg, "flac", "stream.use_proxy", &flac_cfg.stream.use_proxy);
 266         if(flac_cfg.stream.proxy_host)
 267                 g_free(flac_cfg.stream.proxy_host);
 268         if(!xmms_cfg_read_string(cfg, "flac", "stream.proxy_host", &flac_cfg.stream.proxy_host))
 269                 flac_cfg.stream.proxy_host = g_strdup("");
 270         xmms_cfg_read_int(cfg, "flac", "stream.proxy_port", &flac_cfg.stream.proxy_port);
 271         xmms_cfg_read_boolean(cfg, "flac", "stream.proxy_use_auth", &flac_cfg.stream.proxy_use_auth);
 272         if(flac_cfg.stream.proxy_user)
 273                 g_free(flac_cfg.stream.proxy_user);
 274         flac_cfg.stream.proxy_user = NULL;
 275         xmms_cfg_read_string(cfg, "flac", "stream.proxy_user", &flac_cfg.stream.proxy_user);
 276         if(flac_cfg.stream.proxy_pass)
 277                 g_free(flac_cfg.stream.proxy_pass);
 278         flac_cfg.stream.proxy_pass = NULL;
 279         xmms_cfg_read_string(cfg, "flac", "stream.proxy_pass", &flac_cfg.stream.proxy_pass);
 280         xmms_cfg_read_boolean(cfg, "flac", "stream.save_http_stream", &flac_cfg.stream.save_http_stream);
 281         if (flac_cfg.stream.save_http_path)
 282                 g_free (flac_cfg.stream.save_http_path);
 283         if (!xmms_cfg_read_string(cfg, "flac", "stream.save_http_path", &flac_cfg.stream.save_http_path) || ! *flac_cfg.stream.save_http_path) {
 284                 if (flac_cfg.stream.save_http_path)
 285                         g_free (flac_cfg.stream.save_http_path);
 286                 flac_cfg.stream.save_http_path = homedir();
 287         }
 288         xmms_cfg_read_boolean(cfg, "flac", "stream.cast_title_streaming", &flac_cfg.stream.cast_title_streaming);
 289         xmms_cfg_read_boolean(cfg, "flac", "stream.use_udp_channel", &flac_cfg.stream.use_udp_channel);
 290
 291         init_decoder_func_tables();
 292         decoder_func_table_ = DECODER_FUNCS [DECODER_FILE];
 293         decoder_ = decoder_func_table_ -> new_decoder();
 294
 295         xmms_cfg_free(cfg);
 296 }
 297
 298 int FLAC_XMMS__is_our_file(char *filename)
 299 {
 300         char *ext;
 301
 302         ext = strrchr(filename, '.');
 303         if(ext)
 304                 if(!strcasecmp(ext, ".flac") || !strcasecmp(ext, ".fla"))
 305                         return 1;
 306         return 0;
 307 }
 308
 309 void FLAC_XMMS__play_file(char *filename)
 310 {
 311         FILE *f;
 312
 313         sample_buffer_first_ = sample_buffer_last_ = 0;
 314         audio_error_ = false;
 315         file_info_.abort_flag = false;
 316         file_info_.is_playing = false;
 317         file_info_.eof = false;
 318         file_info_.play_thread_open = false;
 319         file_info_.has_replaygain = false;
 320
 321         if (source_to_decoder_type (filename) == DECODER_FILE) {
 322                 if(0 == (f = fopen(filename, "r")))
 323                         return;
 324                 fclose(f);
 325         }
 326
 327         if(decoder_ == 0)
 328                 return;
 329
 330         if(!safe_decoder_init_(filename, &decoder_, &decoder_func_table_))
 331                 return;
 332
 333         if(file_info_.has_replaygain && flac_cfg.output.replaygain.enable) {
 334                 if(flac_cfg.output.resolution.replaygain.bps_out == 8) {
 335                         file_info_.sample_format = FMT_U8;
 336                         file_info_.sample_format_bytes_per_sample = 1;
 337                 }
 338                 else if(flac_cfg.output.resolution.replaygain.bps_out == 16) {
 339                         file_info_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
 340                         file_info_.sample_format_bytes_per_sample = 2;
 341                 }
 342                 else {
 343                         /*@@@ 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); */
 344                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", flac_cfg.output.resolution.replaygain.bps_out);
 345                         decoder_func_table_ -> safe_decoder_finish(decoder_);
 346                         return;
 347                 }
 348         }
 349         else {
 350                 if(file_info_.bits_per_sample == 8) {
 351                         file_info_.sample_format = FMT_U8;
 352                         file_info_.sample_format_bytes_per_sample = 1;
 353                 }
 354                 else if(file_info_.bits_per_sample == 16 || (file_info_.bits_per_sample == 24 && flac_cfg.output.resolution.normal.dither_24_to_16)) {
 355                         file_info_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
 356                         file_info_.sample_format_bytes_per_sample = 2;
 357                 }
 358                 else {
 359                         /*@@@ 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); */
 360                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", file_info_.bits_per_sample);
 361                         decoder_func_table_ -> safe_decoder_finish(decoder_);
 362                         return;
 363                 }
 364         }
 365         FLAC__replaygain_synthesis__init_dither_context(&file_info_.dither_context, file_info_.sample_format_bytes_per_sample * 8, flac_cfg.output.resolution.replaygain.noise_shaping);
 366         file_info_.is_playing = true;
 367
 368         if(flac_ip.output->open_audio(file_info_.sample_format, file_info_.sample_rate, file_info_.channels) == 0) {
 369                 audio_error_ = true;
 370                 decoder_func_table_ -> safe_decoder_finish(decoder_);
 371                 return;
 372         }
 373
 374         file_info_.title = flac_format_song_title(filename);
 375         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);
 376
 377         file_info_.seek_to_in_sec = -1;
 378         file_info_.play_thread_open = true;
 379         pthread_create(&decode_thread_, NULL, play_loop_, NULL);
 380 }
 381
 382 void FLAC_XMMS__stop()
 383 {
 384         if(file_info_.is_playing) {
 385                 file_info_.is_playing = false;
 386                 if(file_info_.play_thread_open) {
 387                         file_info_.play_thread_open = false;
 388                         pthread_join(decode_thread_, NULL);
 389                 }
 390                 flac_ip.output->close_audio();
 391                 decoder_func_table_ -> safe_decoder_finish (decoder_);
 392         }
 393 }
 394
 395 void FLAC_XMMS__pause(short p)
 396 {
 397         flac_ip.output->pause(p);
 398 }
 399
 400 void FLAC_XMMS__seek(int time)
 401 {
 402         if (decoder_func_table_->seekable) {
 403                 file_info_.seek_to_in_sec = time;
 404                 file_info_.eof = false;
 405
 406                 while(file_info_.seek_to_in_sec != -1)
 407                         xmms_usleep(10000);
 408         }
 409 }
 410
 411 int FLAC_XMMS__get_time()
 412 {
 413         if(audio_error_)
 414                 return -2;
 415         if(!file_info_.is_playing || (file_info_.eof && !flac_ip.output->buffer_playing()))
 416                 return -1;
 417         else
 418                 return flac_ip.output->output_time();
 419 }
 420
 421 void FLAC_XMMS__cleanup()
 422 {
 423         decoder_func_table_ -> safe_decoder_delete(decoder_);
 424         decoder_ = 0;
 425 }
 426
 427 void FLAC_XMMS__get_song_info(char *filename, char **title, int *length_in_msec)
 428 {
 429         FLAC__StreamMetadata streaminfo;
 430
 431         if(0 == filename)
 432                 filename = "";
 433
 434         if(!FLAC__metadata_get_streaminfo(filename, &streaminfo)) {
 435                 /* @@@ how to report the error? */
 436                 if(title) {
 437                         if (source_to_decoder_type (filename) == DECODER_FILE) {
 438                                 static const char *errtitle = "Invalid FLAC File: ";
 439                                 *title = g_malloc(strlen(errtitle) + 1 + strlen(filename) + 1 + 1);
 440                                 sprintf(*title, "%s\"%s\"", errtitle, filename);
 441                         } else {
 442                                 *title = NULL;
 443                         }
 444                 }
 445                 if(length_in_msec)
 446                         *length_in_msec = -1;
 447                 return;
 448         }
 449
 450         if(title) {
 451                 *title = flac_format_song_title(filename);
 452         }
 453         if(length_in_msec)
 454                 *length_in_msec = (unsigned)((double)streaminfo.data.stream_info.total_samples / (double)streaminfo.data.stream_info.sample_rate * 1000.0 + 0.5);
 455 }
 456
 457 /***********************************************************************
 458  * local routines
 459  **********************************************************************/
 460
 461 void *play_loop_(void *arg)
 462 {
 463         unsigned written_time_last = 0, bh_index_last_w = 0, bh_index_last_o = BITRATE_HIST_SIZE, blocksize = 1;
 464         FLAC__uint64 decode_position_last = 0, decode_position_frame_last = 0, decode_position_frame = 0;
 465
 466         (void)arg;
 467
 468         while(file_info_.is_playing) {
 469                 if(!file_info_.eof) {
 470                         while(sample_buffer_last_ - sample_buffer_first_ < SAMPLES_PER_WRITE) {
 471                                 unsigned s;
 472
 473                                 s = sample_buffer_last_ - sample_buffer_first_;
 474                                 if(decoder_func_table_ -> is_eof(decoder_)) {
 475                                         file_info_.eof = true;
 476                                         break;
 477                                 }
 478                                 else if (!decoder_func_table_ -> process_single(decoder_)) {
 479                                         /*@@@ this should probably be a dialog */
 480                                         fprintf(stderr, "libxmms-flac: READ ERROR processing frame\n");
 481                                         file_info_.eof = true;
 482                                         break;
 483                                 }
 484                                 blocksize = sample_buffer_last_ - sample_buffer_first_ - s;
 485                                 decode_position_frame_last = decode_position_frame;
 486                                 if(!decoder_func_table_->seekable || !FLAC__file_decoder_get_decode_position(decoder_, &decode_position_frame))
 487                                         decode_position_frame = 0;
 488                         }
 489                         if(sample_buffer_last_ - sample_buffer_first_ > 0) {
 490                                 const unsigned n = min(sample_buffer_last_ - sample_buffer_first_, SAMPLES_PER_WRITE);
 491                                 int bytes = n * file_info_.channels * file_info_.sample_format_bytes_per_sample;
 492                                 FLAC__byte *sample_buffer_start = sample_buffer_ + sample_buffer_first_ * file_info_.channels * file_info_.sample_format_bytes_per_sample;
 493                                 unsigned written_time, bh_index_w;
 494                                 FLAC__uint64 decode_position;
 495
 496                                 sample_buffer_first_ += n;
 497                                 flac_ip.add_vis_pcm(flac_ip.output->written_time(), file_info_.sample_format, file_info_.channels, bytes, sample_buffer_start);
 498                                 while(flac_ip.output->buffer_free() < (int)bytes && file_info_.is_playing && file_info_.seek_to_in_sec == -1)
 499                                         xmms_usleep(10000);
 500                                 if(file_info_.is_playing && file_info_.seek_to_in_sec == -1)
 501                                         flac_ip.output->write_audio(sample_buffer_start, bytes);
 502
 503                                 /* compute current bitrate */
 504
 505                                 written_time = flac_ip.output->written_time();
 506                                 bh_index_w = written_time / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 507                                 if(bh_index_w != bh_index_last_w) {
 508                                         bh_index_last_w = bh_index_w;
 509                                         decode_position = decode_position_frame - (double)(sample_buffer_last_ - sample_buffer_first_) * (double)(decode_position_frame - decode_position_frame_last) / (double)blocksize;
 510                                         bitrate_history_[(bh_index_w + BITRATE_HIST_SIZE - 1) % BITRATE_HIST_SIZE] =
 511                                                 decode_position > decode_position_last && written_time > written_time_last ?
 512                                                         8000 * (decode_position - decode_position_last) / (written_time - written_time_last) :
 513                                                         file_info_.sample_rate * file_info_.channels * file_info_.bits_per_sample;
 514                                         decode_position_last = decode_position;
 515                                         written_time_last = written_time;
 516                                 }
 517                         }
 518                         else {
 519                                 file_info_.eof = true;
 520                                 xmms_usleep(10000);
 521                         }
 522                 }
 523                 else
 524                         xmms_usleep(10000);
 525                 if(decoder_func_table_->seekable && file_info_.seek_to_in_sec != -1) {
 526                         const double distance = (double)file_info_.seek_to_in_sec * 1000.0 / (double)file_info_.length_in_msec;
 527                         unsigned target_sample = (unsigned)(distance * (double)file_info_.total_samples);
 528                         if(FLAC__file_decoder_seek_absolute(decoder_, (FLAC__uint64)target_sample)) {
 529                                 flac_ip.output->flush(file_info_.seek_to_in_sec * 1000);
 530                                 bh_index_last_w = bh_index_last_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 531                                 if(!FLAC__file_decoder_get_decode_position(decoder_, &decode_position_frame))
 532                                         decode_position_frame = 0;
 533                                 file_info_.seek_to_in_sec = -1;
 534                                 file_info_.eof = false;
 535                                 sample_buffer_first_ = sample_buffer_last_ = 0;
 536                         }
 537                 }
 538                 else {
 539                         /* display the right bitrate from history */
 540                         unsigned bh_index_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 541                         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) {
 542                                 bh_index_last_o = bh_index_o;
 543                                 flac_ip.set_info(file_info_.title, file_info_.length_in_msec, bitrate_history_[bh_index_o], file_info_.sample_rate, file_info_.channels);
 544                         }
 545                 }
 546         }
 547
 548         decoder_func_table_ -> safe_decoder_finish(decoder_);
 549
 550         /* are these two calls necessary? */
 551         flac_ip.output->buffer_free();
 552         flac_ip.output->buffer_free();
 553
 554         g_free(file_info_.title);
 555
 556         pthread_exit(NULL);
 557         return 0; /* to silence the compiler warning about not returning a value */
 558 }
 559
 560 /*********** File decoder functions */
 561
 562 static FLAC__bool file_decoder_init (void *decoder)
 563 {
 564         return FLAC__file_decoder_init( (FLAC__FileDecoder*) decoder) == FLAC__FILE_DECODER_OK;
 565 }
 566
 567 static void file_decoder_safe_decoder_finish_(void *decoder)
 568 {
 569         if(decoder && FLAC__file_decoder_get_state((FLAC__FileDecoder *) decoder) != FLAC__FILE_DECODER_UNINITIALIZED)
 570                 FLAC__file_decoder_finish((FLAC__FileDecoder *) decoder);
 571 }
 572
 573 static void file_decoder_safe_decoder_delete_(void *decoder)
 574 {
 575         if(decoder) {
 576                 file_decoder_safe_decoder_finish_(decoder);
 577                 FLAC__file_decoder_delete( (FLAC__FileDecoder *) decoder);
 578         }
 579 }
 580
 581 static FLAC__bool file_decoder_is_eof(void *decoder)
 582 {
 583         return FLAC__file_decoder_get_state((FLAC__FileDecoder *) decoder) == FLAC__FILE_DECODER_END_OF_FILE;
 584 }
 585
 586 static const decoder_funcs_t FILE_DECODER_FUNCTIONS = {
 587         true,
 588         (void* (*) (void)) FLAC__file_decoder_new,
 589         (FLAC__bool (*) (void *, FLAC__bool)) FLAC__file_decoder_set_md5_checking,
 590         (FLAC__bool (*) (void *, const char*)) FLAC__file_decoder_set_filename,
 591         (FLAC__bool (*) (void *)) FLAC__file_decoder_set_metadata_ignore_all,
 592         (FLAC__bool (*) (void *, FLAC__MetadataType)) FLAC__file_decoder_set_metadata_respond,
 593         (FLAC__bool (*) (void *, WriteCallback)) FLAC__file_decoder_set_write_callback,
 594         (FLAC__bool (*) (void *, MetadataCallback)) FLAC__file_decoder_set_metadata_callback,
 595         (FLAC__bool (*) (void *, ErrorCallback)) FLAC__file_decoder_set_error_callback,
 596         (FLAC__bool (*) (void *, void *)) FLAC__file_decoder_set_client_data,
 597         (FLAC__bool (*) (void *)) file_decoder_init,
 598         (void (*) (void *)) file_decoder_safe_decoder_finish_,
 599         (void (*) (void *)) file_decoder_safe_decoder_delete_,
 600         (FLAC__bool (*) (void *)) FLAC__file_decoder_process_until_end_of_metadata,
 601         (FLAC__bool (*) (void *)) FLAC__file_decoder_process_single,
 602         file_decoder_is_eof
 603 };
 604
 605 /*********** HTTP decoder functions */
 606
 607 static gchar *url_;
 608
 609 static FLAC__bool http_decoder_set_md5_checking (void *decoder, FLAC__bool value)
 610 {
 611         (void) value;
 612         // operation unsupported
 613         return FLAC__stream_decoder_get_state ((const FLAC__StreamDecoder *) decoder) ==
 614                 FLAC__STREAM_DECODER_UNINITIALIZED;
 615 }
 616
 617 static FLAC__bool http_decoder_set_url (void *decoder, const char* url)
 618 {
 619         (void) decoder;
 620         url_ = g_strdup (url);
 621         return true;
 622 }
 623
 624 static FLAC__StreamDecoderReadStatus http_decoder_read_callback (const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data)
 625 {
 626         (void) decoder;
 627         (void) client_data;
 628         *bytes = flac_http_read (buffer, *bytes);
 629         return *bytes ? FLAC__STREAM_DECODER_READ_STATUS_CONTINUE : FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
 630 }
 631
 632 static FLAC__bool http_decoder_init (void *decoder)
 633 {
 634         flac_http_open (url_, 0);
 635         g_free (url_);
 636         FLAC__stream_decoder_set_read_callback (decoder, http_decoder_read_callback);
 637         return FLAC__stream_decoder_init( (FLAC__StreamDecoder*) decoder) == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 638 }
 639
 640 static void http_decoder_safe_decoder_finish_(void *decoder)
 641 {
 642         if(decoder && FLAC__stream_decoder_get_state((FLAC__StreamDecoder *) decoder) != FLAC__STREAM_DECODER_UNINITIALIZED) {
 643                 FLAC__stream_decoder_finish((FLAC__StreamDecoder *) decoder);
 644                 flac_http_close();
 645         }
 646 }
 647
 648 static void http_decoder_safe_decoder_delete_(void *decoder)
 649 {
 650         if(decoder) {
 651                 http_decoder_safe_decoder_finish_(decoder);
 652                 FLAC__stream_decoder_delete( (FLAC__StreamDecoder *) decoder);
 653         }
 654 }
 655
 656 static FLAC__bool http_decoder_is_eof(void *decoder)
 657 {
 658         return FLAC__stream_decoder_get_state((FLAC__StreamDecoder *) decoder) == FLAC__STREAM_DECODER_END_OF_STREAM;
 659 }
 660
 661 static const decoder_funcs_t HTTP_DECODER_FUNCTIONS = {
 662         false,
 663         (void* (*) (void)) FLAC__stream_decoder_new,
 664         http_decoder_set_md5_checking,
 665         (FLAC__bool (*) (void *, const char*)) http_decoder_set_url,
 666         (FLAC__bool (*) (void *)) FLAC__stream_decoder_set_metadata_ignore_all,
 667         (FLAC__bool (*) (void *, FLAC__MetadataType)) FLAC__stream_decoder_set_metadata_respond,
 668         (FLAC__bool (*) (void *, WriteCallback)) FLAC__stream_decoder_set_write_callback,
 669         (FLAC__bool (*) (void *, MetadataCallback)) FLAC__stream_decoder_set_metadata_callback,
 670         (FLAC__bool (*) (void *, ErrorCallback)) FLAC__stream_decoder_set_error_callback,
 671         (FLAC__bool (*) (void *, void *)) FLAC__stream_decoder_set_client_data,
 672         (FLAC__bool (*) (void *)) http_decoder_init,
 673         (void (*) (void *)) http_decoder_safe_decoder_finish_,
 674         (void (*) (void *)) http_decoder_safe_decoder_delete_,
 675         (FLAC__bool (*) (void *)) FLAC__stream_decoder_process_until_end_of_metadata,
 676         (FLAC__bool (*) (void *)) FLAC__stream_decoder_process_single,
 677         http_decoder_is_eof
 678 };
 679
 680 static decoder_funcs_t const *decoder_func_table_;
 681
 682 static void init_decoder_func_tables()
 683 {
 684         DECODER_FUNCS [DECODER_FILE] = & FILE_DECODER_FUNCTIONS;
 685         DECODER_FUNCS [DECODER_HTTP] = & HTTP_DECODER_FUNCTIONS;
 686 }
 687
 688 static decoder_t source_to_decoder_type (const char *source)
 689 {
 690         return strncasecmp(source, "http://", 7) ? DECODER_FILE : DECODER_HTTP;
 691 }
 692
 693 static void change_decoder_if_needed (decoder_t new_decoder_type, void **decoderp, decoder_funcs_t const ** fntabp)
 694 {
 695         const decoder_funcs_t *new_fn_table = DECODER_FUNCS [new_decoder_type];
 696         if (*fntabp != new_fn_table) {
 697                 (*fntabp)->safe_decoder_delete(*decoderp);
 698                 *fntabp = new_fn_table;
 699                 *decoderp = new_fn_table -> new_decoder();
 700         }
 701 }
 702
 703 FLAC__bool safe_decoder_init_(const char *filename, void **decoderp, decoder_funcs_t const ** fntabp)
 704 {
 705         if(decoderp == 0 || *decoderp == 0)
 706                 return false;
 707
 708         (*fntabp)->safe_decoder_finish(*decoderp);
 709
 710         change_decoder_if_needed(source_to_decoder_type(filename), decoderp, fntabp);
 711
 712         {
 713                 decoder_funcs_t const *fntab = *fntabp;
 714                 void *decoder = *decoderp;
 715
 716                 decoder = *decoderp;
 717                 fntab = *fntabp;
 718
 719                 fntab -> set_md5_checking(decoder, false);
 720                 fntab -> set_source(decoder, filename);
 721                 fntab -> set_metadata_ignore_all(decoder);
 722                 fntab -> set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO);
 723                 fntab -> set_metadata_respond(decoder, FLAC__METADATA_TYPE_VORBIS_COMMENT);
 724                 fntab -> set_write_callback(decoder, write_callback_);
 725                 fntab -> set_metadata_callback(decoder, metadata_callback_);
 726                 fntab -> set_error_callback(decoder, error_callback_);
 727                 fntab -> set_client_data(decoder, &file_info_);
 728                 if(!fntab -> decoder_init(decoder))
 729                         return false;
 730
 731                 if(!fntab -> process_until_end_of_metadata(decoder))
 732                         return false;
 733         }
 734
 735         return true;
 736 }
 737
 738 FLAC__StreamDecoderWriteStatus write_callback_(const void *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
 739 {
 740         file_info_struct *file_info = (file_info_struct *)client_data;
 741         const unsigned channels = file_info->channels, wide_samples = frame->header.blocksize;
 742         const unsigned bits_per_sample = file_info->bits_per_sample;
 743         FLAC__byte *sample_buffer_start;
 744
 745         (void)decoder;
 746
 747         if(file_info->abort_flag)
 748                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 749
 750         if((sample_buffer_last_ + wide_samples) > (SAMPLE_BUFFER_SIZE / (channels * file_info->sample_format_bytes_per_sample))) {
 751                 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);
 752                 sample_buffer_last_ -= sample_buffer_first_;
 753                 sample_buffer_first_ = 0;
 754         }
 755         sample_buffer_start = sample_buffer_ + sample_buffer_last_ * channels * file_info->sample_format_bytes_per_sample;
 756         if(file_info->has_replaygain && flac_cfg.output.replaygain.enable) {
 757                 FLAC__replaygain_synthesis__apply_gain(
 758                                 sample_buffer_start,
 759                                 !is_big_endian_host_,
 760                                 file_info->sample_format_bytes_per_sample == 1, /* unsigned_data_out */
 761                                 buffer,
 762                                 wide_samples,
 763                                 channels,
 764                                 bits_per_sample,
 765                                 file_info->sample_format_bytes_per_sample * 8,
 766                                 file_info->replay_scale,
 767                                 flac_cfg.output.replaygain.hard_limit,
 768                                 flac_cfg.output.resolution.replaygain.dither,
 769                                 &file_info->dither_context
 770                 );
 771         }
 772         else if(is_big_endian_host_) {
 773                 FLAC__plugin_common__pack_pcm_signed_big_endian(
 774                         sample_buffer_start,
 775                         buffer,
 776                         wide_samples,
 777                         channels,
 778                         bits_per_sample,
 779                         file_info->sample_format_bytes_per_sample * 8
 780                 );
 781         }
 782         else {
 783                 FLAC__plugin_common__pack_pcm_signed_little_endian(
 784                         sample_buffer_start,
 785                         buffer,
 786                         wide_samples,
 787                         channels,
 788                         bits_per_sample,
 789                         file_info->sample_format_bytes_per_sample * 8
 790                 );
 791         }
 792
 793         sample_buffer_last_ += wide_samples;
 794
 795         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
 796 }
 797
 798 void metadata_callback_(const void *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
 799 {
 800         file_info_struct *file_info = (file_info_struct *)client_data;
 801         (void)decoder;
 802         if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
 803                 FLAC__ASSERT(metadata->data.stream_info.total_samples < FLAC__U64L(0x100000000)); /* this plugin can only handle < 4 gigasamples */
 804                 file_info->total_samples = (unsigned)(metadata->data.stream_info.total_samples&0xffffffff);
 805                 file_info->bits_per_sample = metadata->data.stream_info.bits_per_sample;
 806                 file_info->channels = metadata->data.stream_info.channels;
 807                 file_info->sample_rate = metadata->data.stream_info.sample_rate;
 808                 file_info->length_in_msec = (unsigned)((double)file_info->total_samples / (double)file_info->sample_rate * 1000.0 + 0.5);
 809         }
 810         else if(metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
 811                 double gain, peak;
 812                 if(grabbag__replaygain_load_from_vorbiscomment(metadata, flac_cfg.output.replaygain.album_mode, /*strict=*/false, &gain, &peak)) {
 813                         file_info->has_replaygain = true;
 814                         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);
 815                 }
 816         }
 817 }
 818
 819 void error_callback_(const void *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
 820 {
 821         file_info_struct *file_info = (file_info_struct *)client_data;
 822         (void)decoder;
 823         if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
 824                 file_info->abort_flag = true;
 825 }