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         "Reference 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         g_free(flac_cfg.title.tag_format);
 224         flac_cfg.title.convert_char_set = FALSE;
 225
 226         cfg = xmms_cfg_open_default_file();
 227
 228         /* title */
 229
 230         xmms_cfg_read_boolean(cfg, "flac", "title.tag_override", &flac_cfg.title.tag_override);
 231
 232         if(!xmms_cfg_read_string(cfg, "flac", "title.tag_format", &flac_cfg.title.tag_format))
 233                 flac_cfg.title.tag_format = g_strdup("%p - %t");
 234
 235         xmms_cfg_read_boolean(cfg, "flac", "title.convert_char_set", &flac_cfg.title.convert_char_set);
 236
 237         if(!xmms_cfg_read_string(cfg, "flac", "title.user_char_set", &flac_cfg.title.user_char_set))
 238                 flac_cfg.title.user_char_set = FLAC_plugin__charset_get_current();
 239
 240         /* replaygain */
 241
 242         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.enable", &flac_cfg.output.replaygain.enable);
 243
 244         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.album_mode", &flac_cfg.output.replaygain.album_mode);
 245
 246         if(!xmms_cfg_read_int(cfg, "flac", "output.replaygain.preamp", &flac_cfg.output.replaygain.preamp))
 247                 flac_cfg.output.replaygain.preamp = 0;
 248
 249         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.hard_limit", &flac_cfg.output.replaygain.hard_limit);
 250
 251         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.normal.dither_24_to_16", &flac_cfg.output.resolution.normal.dither_24_to_16);
 252         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.replaygain.dither", &flac_cfg.output.resolution.replaygain.dither);
 253
 254         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.noise_shaping", &flac_cfg.output.resolution.replaygain.noise_shaping))
 255                 flac_cfg.output.resolution.replaygain.noise_shaping = 1;
 256
 257         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.bps_out", &flac_cfg.output.resolution.replaygain.bps_out))
 258                 flac_cfg.output.resolution.replaygain.bps_out = 16;
 259
 260         /* stream */
 261
 262         xmms_cfg_read_int(cfg, "flac", "stream.http_buffer_size", &flac_cfg.stream.http_buffer_size);
 263         xmms_cfg_read_int(cfg, "flac", "stream.http_prebuffer", &flac_cfg.stream.http_prebuffer);
 264         xmms_cfg_read_boolean(cfg, "flac", "stream.use_proxy", &flac_cfg.stream.use_proxy);
 265         xmms_cfg_read_string(cfg, "flac", "stream.proxy_host", &flac_cfg.stream.proxy_host);
 266         xmms_cfg_read_int(cfg, "flac", "stream.proxy_port", &flac_cfg.stream.proxy_port);
 267         xmms_cfg_read_boolean(cfg, "flac", "stream.proxy_use_auth", &flac_cfg.stream.proxy_use_auth);
 268         xmms_cfg_read_string(cfg, "flac", "stream.proxy_user", &flac_cfg.stream.proxy_user);
 269         xmms_cfg_read_string(cfg, "flac", "stream.proxy_pass", &flac_cfg.stream.proxy_pass);
 270         xmms_cfg_read_boolean(cfg, "flac", "stream.save_http_stream", &flac_cfg.stream.save_http_stream);
 271         if (!xmms_cfg_read_string(cfg, "flac", "stream.save_http_path", &flac_cfg.stream.save_http_path) ||
 272                  ! *flac_cfg.stream.save_http_path) {
 273                 if (flac_cfg.stream.save_http_path)
 274                         g_free (flac_cfg.stream.save_http_path);
 275                 flac_cfg.stream.save_http_path = homedir();
 276         }
 277         xmms_cfg_read_boolean(cfg, "flac", "stream.cast_title_streaming", &flac_cfg.stream.cast_title_streaming);
 278         xmms_cfg_read_boolean(cfg, "flac", "stream.use_udp_channel", &flac_cfg.stream.use_udp_channel);
 279
 280         init_decoder_func_tables();
 281         decoder_func_table_ = DECODER_FUNCS [DECODER_FILE];
 282         decoder_ = decoder_func_table_ -> new_decoder();
 283
 284         xmms_cfg_free(cfg);
 285 }
 286
 287 int FLAC_XMMS__is_our_file(char *filename)
 288 {
 289         char *ext;
 290
 291         ext = strrchr(filename, '.');
 292         if(ext)
 293                 if(!strcasecmp(ext, ".flac") || !strcasecmp(ext, ".fla"))
 294                         return 1;
 295         return 0;
 296 }
 297
 298 void FLAC_XMMS__play_file(char *filename)
 299 {
 300         FILE *f;
 301
 302         sample_buffer_first_ = sample_buffer_last_ = 0;
 303         audio_error_ = false;
 304         file_info_.abort_flag = false;
 305         file_info_.is_playing = false;
 306         file_info_.eof = false;
 307         file_info_.play_thread_open = false;
 308         file_info_.has_replaygain = false;
 309
 310         if (source_to_decoder_type (filename) == DECODER_FILE) {
 311                 if(0 == (f = fopen(filename, "r")))
 312                         return;
 313                 fclose(f);
 314         }
 315
 316         if(decoder_ == 0)
 317                 return;
 318
 319         if(!safe_decoder_init_(filename, &decoder_, &decoder_func_table_))
 320                 return;
 321
 322         if(file_info_.has_replaygain && flac_cfg.output.replaygain.enable) {
 323                 if(flac_cfg.output.resolution.replaygain.bps_out == 8) {
 324                         file_info_.sample_format = FMT_U8;
 325                         file_info_.sample_format_bytes_per_sample = 1;
 326                 }
 327                 else if(flac_cfg.output.resolution.replaygain.bps_out == 16) {
 328                         file_info_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
 329                         file_info_.sample_format_bytes_per_sample = 2;
 330                 }
 331                 else {
 332                         /*@@@ 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); */
 333                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", flac_cfg.output.resolution.replaygain.bps_out);
 334                         decoder_func_table_ -> safe_decoder_finish(decoder_);
 335                         return;
 336                 }
 337         }
 338         else {
 339                 if(file_info_.bits_per_sample == 8) {
 340                         file_info_.sample_format = FMT_U8;
 341                         file_info_.sample_format_bytes_per_sample = 1;
 342                 }
 343                 else if(file_info_.bits_per_sample == 16 || (file_info_.bits_per_sample == 24 && flac_cfg.output.resolution.normal.dither_24_to_16)) {
 344                         file_info_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
 345                         file_info_.sample_format_bytes_per_sample = 2;
 346                 }
 347                 else {
 348                         /*@@@ 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); */
 349                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", file_info_.bits_per_sample);
 350                         decoder_func_table_ -> safe_decoder_finish(decoder_);
 351                         return;
 352                 }
 353         }
 354         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);
 355         file_info_.is_playing = true;
 356
 357         if(flac_ip.output->open_audio(file_info_.sample_format, file_info_.sample_rate, file_info_.channels) == 0) {
 358                 audio_error_ = true;
 359                 decoder_func_table_ -> safe_decoder_finish(decoder_);
 360                 return;
 361         }
 362
 363         file_info_.title = flac_format_song_title(filename);
 364         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);
 365
 366         file_info_.seek_to_in_sec = -1;
 367         file_info_.play_thread_open = true;
 368         pthread_create(&decode_thread_, NULL, play_loop_, NULL);
 369 }
 370
 371 void FLAC_XMMS__stop()
 372 {
 373         if(file_info_.is_playing) {
 374                 file_info_.is_playing = false;
 375                 if(file_info_.play_thread_open) {
 376                         file_info_.play_thread_open = false;
 377                         pthread_join(decode_thread_, NULL);
 378                 }
 379                 flac_ip.output->close_audio();
 380                 decoder_func_table_ -> safe_decoder_finish (decoder_);
 381         }
 382 }
 383
 384 void FLAC_XMMS__pause(short p)
 385 {
 386         flac_ip.output->pause(p);
 387 }
 388
 389 void FLAC_XMMS__seek(int time)
 390 {
 391         if (decoder_func_table_->seekable) {
 392                 file_info_.seek_to_in_sec = time;
 393                 file_info_.eof = false;
 394
 395                 while(file_info_.seek_to_in_sec != -1)
 396                         xmms_usleep(10000);
 397         }
 398 }
 399
 400 int FLAC_XMMS__get_time()
 401 {
 402         if(audio_error_)
 403                 return -2;
 404         if(!file_info_.is_playing || (file_info_.eof && !flac_ip.output->buffer_playing()))
 405                 return -1;
 406         else
 407                 return flac_ip.output->output_time();
 408 }
 409
 410 void FLAC_XMMS__cleanup()
 411 {
 412         decoder_func_table_ -> safe_decoder_delete(decoder_);
 413         decoder_ = 0;
 414 }
 415
 416 void FLAC_XMMS__get_song_info(char *filename, char **title, int *length_in_msec)
 417 {
 418         FLAC__StreamMetadata streaminfo;
 419
 420         if(0 == filename)
 421                 filename = "";
 422
 423         if(!FLAC__metadata_get_streaminfo(filename, &streaminfo)) {
 424                 /* @@@ how to report the error? */
 425                 if(title) {
 426                         if (source_to_decoder_type (filename) == DECODER_FILE) {
 427                                 static const char *errtitle = "Invalid FLAC File: ";
 428                                 *title = g_malloc(strlen(errtitle) + 1 + strlen(filename) + 1 + 1);
 429                                 sprintf(*title, "%s\"%s\"", errtitle, filename);
 430                         } else {
 431                                 *title = NULL;
 432                         }
 433                 }
 434                 if(length_in_msec)
 435                         *length_in_msec = -1;
 436                 return;
 437         }
 438
 439         if(title) {
 440                 *title = flac_format_song_title(filename);
 441         }
 442         if(length_in_msec)
 443                 *length_in_msec = streaminfo.data.stream_info.total_samples * 10 / (streaminfo.data.stream_info.sample_rate / 100);
 444 }
 445
 446 /***********************************************************************
 447  * local routines
 448  **********************************************************************/
 449
 450 void *play_loop_(void *arg)
 451 {
 452         unsigned written_time_last = 0, bh_index_last_w = 0, bh_index_last_o = BITRATE_HIST_SIZE, blocksize = 1;
 453         FLAC__uint64 decode_position_last = 0, decode_position_frame_last = 0, decode_position_frame = 0;
 454
 455         (void)arg;
 456
 457         while(file_info_.is_playing) {
 458                 if(!file_info_.eof) {
 459                         while(sample_buffer_last_ - sample_buffer_first_ < SAMPLES_PER_WRITE) {
 460                                 unsigned s;
 461
 462                                 s = sample_buffer_last_ - sample_buffer_first_;
 463                                 if(decoder_func_table_ -> is_eof(decoder_)) {
 464                                         file_info_.eof = true;
 465                                         break;
 466                                 }
 467                                 else if (!decoder_func_table_ -> process_single(decoder_)) {
 468                                         /*@@@ this should probably be a dialog */
 469                                         fprintf(stderr, "libxmms-flac: READ ERROR processing frame\n");
 470                                         file_info_.eof = true;
 471                                         break;
 472                                 }
 473                                 blocksize = sample_buffer_last_ - sample_buffer_first_ - s;
 474                                 decode_position_frame_last = decode_position_frame;
 475                                 if(!decoder_func_table_->seekable || !FLAC__file_decoder_get_decode_position(decoder_, &decode_position_frame))
 476                                         decode_position_frame = 0;
 477                         }
 478                         if(sample_buffer_last_ - sample_buffer_first_ > 0) {
 479                                 const unsigned n = min(sample_buffer_last_ - sample_buffer_first_, SAMPLES_PER_WRITE);
 480                                 int bytes = n * file_info_.channels * file_info_.sample_format_bytes_per_sample;
 481                                 FLAC__byte *sample_buffer_start = sample_buffer_ + sample_buffer_first_ * file_info_.channels * file_info_.sample_format_bytes_per_sample;
 482                                 unsigned written_time, bh_index_w;
 483                                 FLAC__uint64 decode_position;
 484
 485                                 sample_buffer_first_ += n;
 486                                 flac_ip.add_vis_pcm(flac_ip.output->written_time(), file_info_.sample_format, file_info_.channels, bytes, sample_buffer_start);
 487                                 while(flac_ip.output->buffer_free() < (int)bytes && file_info_.is_playing && file_info_.seek_to_in_sec == -1)
 488                                         xmms_usleep(10000);
 489                                 if(file_info_.is_playing && file_info_.seek_to_in_sec == -1)
 490                                         flac_ip.output->write_audio(sample_buffer_start, bytes);
 491
 492                                 /* compute current bitrate */
 493
 494                                 written_time = flac_ip.output->written_time();
 495                                 bh_index_w = written_time / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 496                                 if(bh_index_w != bh_index_last_w) {
 497                                         bh_index_last_w = bh_index_w;
 498                                         decode_position = decode_position_frame - (double)(sample_buffer_last_ - sample_buffer_first_) * (double)(decode_position_frame - decode_position_frame_last) / (double)blocksize;
 499                                         bitrate_history_[(bh_index_w + BITRATE_HIST_SIZE - 1) % BITRATE_HIST_SIZE] =
 500                                                 decode_position > decode_position_last && written_time > written_time_last ?
 501                                                         8000 * (decode_position - decode_position_last) / (written_time - written_time_last) :
 502                                                         file_info_.sample_rate * file_info_.channels * file_info_.bits_per_sample;
 503                                         decode_position_last = decode_position;
 504                                         written_time_last = written_time;
 505                                 }
 506                         }
 507                         else {
 508                                 file_info_.eof = true;
 509                                 xmms_usleep(10000);
 510                         }
 511                 }
 512                 else
 513                         xmms_usleep(10000);
 514                 if(decoder_func_table_->seekable && file_info_.seek_to_in_sec != -1) {
 515                         const double distance = (double)file_info_.seek_to_in_sec * 1000.0 / (double)file_info_.length_in_msec;
 516                         unsigned target_sample = (unsigned)(distance * (double)file_info_.total_samples);
 517                         if(FLAC__file_decoder_seek_absolute(decoder_, (FLAC__uint64)target_sample)) {
 518                                 flac_ip.output->flush(file_info_.seek_to_in_sec * 1000);
 519                                 bh_index_last_w = bh_index_last_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 520                                 if(!FLAC__file_decoder_get_decode_position(decoder_, &decode_position_frame))
 521                                         decode_position_frame = 0;
 522                                 file_info_.seek_to_in_sec = -1;
 523                                 file_info_.eof = false;
 524                                 sample_buffer_first_ = sample_buffer_last_ = 0;
 525                         }
 526                 }
 527                 else {
 528                         /* display the right bitrate from history */
 529                         unsigned bh_index_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 530                         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) {
 531                                 bh_index_last_o = bh_index_o;
 532                                 flac_ip.set_info(file_info_.title, file_info_.length_in_msec, bitrate_history_[bh_index_o], file_info_.sample_rate, file_info_.channels);
 533                         }
 534                 }
 535         }
 536
 537         decoder_func_table_ -> safe_decoder_finish(decoder_);
 538
 539         /* are these two calls necessary? */
 540         flac_ip.output->buffer_free();
 541         flac_ip.output->buffer_free();
 542
 543         g_free(file_info_.title);
 544
 545         pthread_exit(NULL);
 546         return 0; /* to silence the compiler warning about not returning a value */
 547 }
 548
 549 /*********** File decoder functions */
 550
 551 static FLAC__bool file_decoder_init (void *decoder)
 552 {
 553         return FLAC__file_decoder_init( (FLAC__FileDecoder*) decoder) == FLAC__FILE_DECODER_OK;
 554 }
 555
 556 static void file_decoder_safe_decoder_finish_(void *decoder)
 557 {
 558         if(decoder && FLAC__file_decoder_get_state((FLAC__FileDecoder *) decoder) != FLAC__FILE_DECODER_UNINITIALIZED)
 559                 FLAC__file_decoder_finish((FLAC__FileDecoder *) decoder);
 560 }
 561
 562 static void file_decoder_safe_decoder_delete_(void *decoder)
 563 {
 564         if(decoder) {
 565                 file_decoder_safe_decoder_finish_(decoder);
 566                 FLAC__file_decoder_delete( (FLAC__FileDecoder *) decoder);
 567         }
 568 }
 569
 570 static FLAC__bool file_decoder_is_eof(void *decoder)
 571 {
 572         return FLAC__file_decoder_get_state((FLAC__FileDecoder *) decoder) == FLAC__FILE_DECODER_END_OF_FILE;
 573 }
 574
 575 static const decoder_funcs_t FILE_DECODER_FUNCTIONS = {
 576         true,
 577         (void* (*) (void)) FLAC__file_decoder_new,
 578         (FLAC__bool (*) (void *, FLAC__bool)) FLAC__file_decoder_set_md5_checking,
 579         (FLAC__bool (*) (void *, const char*)) FLAC__file_decoder_set_filename,
 580         (FLAC__bool (*) (void *)) FLAC__file_decoder_set_metadata_ignore_all,
 581         (FLAC__bool (*) (void *, FLAC__MetadataType)) FLAC__file_decoder_set_metadata_respond,
 582         (FLAC__bool (*) (void *, WriteCallback)) FLAC__file_decoder_set_write_callback,
 583         (FLAC__bool (*) (void *, MetadataCallback)) FLAC__file_decoder_set_metadata_callback,
 584         (FLAC__bool (*) (void *, ErrorCallback)) FLAC__file_decoder_set_error_callback,
 585         (FLAC__bool (*) (void *, void *)) FLAC__file_decoder_set_client_data,
 586         (FLAC__bool (*) (void *)) file_decoder_init,
 587         (void (*) (void *)) file_decoder_safe_decoder_finish_,
 588         (void (*) (void *)) file_decoder_safe_decoder_delete_,
 589         (FLAC__bool (*) (void *)) FLAC__file_decoder_process_until_end_of_metadata,
 590         (FLAC__bool (*) (void *)) FLAC__file_decoder_process_single,
 591         file_decoder_is_eof
 592 };
 593
 594 /*********** HTTP decoder functions */
 595
 596 static gchar *url_;
 597
 598 static FLAC__bool http_decoder_set_md5_checking (void *decoder, FLAC__bool value)
 599 {
 600         (void) value;
 601         // operation unsupported
 602         return FLAC__stream_decoder_get_state ((const FLAC__StreamDecoder *) decoder) ==
 603                 FLAC__STREAM_DECODER_UNINITIALIZED;
 604 }
 605
 606 static FLAC__bool http_decoder_set_url (void *decoder, const char* url)
 607 {
 608         (void) decoder;
 609         url_ = g_strdup (url);
 610         return true;
 611 }
 612
 613 static FLAC__StreamDecoderReadStatus http_decoder_read_callback (const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data)
 614 {
 615         (void) decoder;
 616         (void) client_data;
 617         *bytes = flac_http_read (buffer, *bytes);
 618         return *bytes ? FLAC__STREAM_DECODER_READ_STATUS_CONTINUE : FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
 619 }
 620
 621 static FLAC__bool http_decoder_init (void *decoder)
 622 {
 623         flac_http_open (url_, 0);
 624         g_free (url_);
 625         FLAC__stream_decoder_set_read_callback (decoder, http_decoder_read_callback);
 626         return FLAC__stream_decoder_init( (FLAC__StreamDecoder*) decoder) == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
 627 }
 628
 629 static void http_decoder_safe_decoder_finish_(void *decoder)
 630 {
 631         if(decoder && FLAC__stream_decoder_get_state((FLAC__StreamDecoder *) decoder) != FLAC__STREAM_DECODER_UNINITIALIZED) {
 632                 FLAC__stream_decoder_finish((FLAC__StreamDecoder *) decoder);
 633                 flac_http_close();
 634         }
 635 }
 636
 637 static void http_decoder_safe_decoder_delete_(void *decoder)
 638 {
 639         if(decoder) {
 640                 http_decoder_safe_decoder_finish_(decoder);
 641                 FLAC__stream_decoder_delete( (FLAC__StreamDecoder *) decoder);
 642         }
 643 }
 644
 645 static FLAC__bool http_decoder_is_eof(void *decoder)
 646 {
 647         return FLAC__stream_decoder_get_state((FLAC__StreamDecoder *) decoder) == FLAC__STREAM_DECODER_END_OF_STREAM;
 648 }
 649
 650 static const decoder_funcs_t HTTP_DECODER_FUNCTIONS = {
 651         false,
 652         (void* (*) (void)) FLAC__stream_decoder_new,
 653         http_decoder_set_md5_checking,
 654         (FLAC__bool (*) (void *, const char*)) http_decoder_set_url,
 655         (FLAC__bool (*) (void *)) FLAC__stream_decoder_set_metadata_ignore_all,
 656         (FLAC__bool (*) (void *, FLAC__MetadataType)) FLAC__stream_decoder_set_metadata_respond,
 657         (FLAC__bool (*) (void *, WriteCallback)) FLAC__stream_decoder_set_write_callback,
 658         (FLAC__bool (*) (void *, MetadataCallback)) FLAC__stream_decoder_set_metadata_callback,
 659         (FLAC__bool (*) (void *, ErrorCallback)) FLAC__stream_decoder_set_error_callback,
 660         (FLAC__bool (*) (void *, void *)) FLAC__stream_decoder_set_client_data,
 661         (FLAC__bool (*) (void *)) http_decoder_init,
 662         (void (*) (void *)) http_decoder_safe_decoder_finish_,
 663         (void (*) (void *)) http_decoder_safe_decoder_delete_,
 664         (FLAC__bool (*) (void *)) FLAC__stream_decoder_process_until_end_of_metadata,
 665         (FLAC__bool (*) (void *)) FLAC__stream_decoder_process_single,
 666         http_decoder_is_eof
 667 };
 668
 669 static decoder_funcs_t const *decoder_func_table_;
 670
 671 static void init_decoder_func_tables()
 672 {
 673         DECODER_FUNCS [DECODER_FILE] = & FILE_DECODER_FUNCTIONS;
 674         DECODER_FUNCS [DECODER_HTTP] = & HTTP_DECODER_FUNCTIONS;
 675 }
 676
 677 static decoder_t source_to_decoder_type (const char *source)
 678 {
 679         return strncasecmp(source, "http://", 7) ? DECODER_FILE : DECODER_HTTP;
 680 }
 681
 682 static void change_decoder_if_needed (decoder_t new_decoder_type, void **decoderp, decoder_funcs_t const ** fntabp)
 683 {
 684         const decoder_funcs_t *new_fn_table = DECODER_FUNCS [new_decoder_type];
 685         if (*fntabp != new_fn_table) {
 686                 (*fntabp)->safe_decoder_delete(*decoderp);
 687                 *fntabp = new_fn_table;
 688                 *decoderp = new_fn_table -> new_decoder();
 689         }
 690 }
 691
 692 FLAC__bool safe_decoder_init_(const char *filename, void **decoderp, decoder_funcs_t const ** fntabp)
 693 {
 694         if(decoderp == 0 || *decoderp == 0)
 695                 return false;
 696
 697         (*fntabp)->safe_decoder_finish(*decoderp);
 698
 699         change_decoder_if_needed(source_to_decoder_type(filename), decoderp, fntabp);
 700
 701         {
 702                 decoder_funcs_t const *fntab = *fntabp;
 703                 void *decoder = *decoderp;
 704
 705                 decoder = *decoderp;
 706                 fntab = *fntabp;
 707
 708                 fntab -> set_md5_checking(decoder, false);
 709                 fntab -> set_source(decoder, filename);
 710                 fntab -> set_metadata_ignore_all(decoder);
 711                 fntab -> set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO);
 712                 fntab -> set_metadata_respond(decoder, FLAC__METADATA_TYPE_VORBIS_COMMENT);
 713                 fntab -> set_write_callback(decoder, write_callback_);
 714                 fntab -> set_metadata_callback(decoder, metadata_callback_);
 715                 fntab -> set_error_callback(decoder, error_callback_);
 716                 fntab -> set_client_data(decoder, &file_info_);
 717                 if(!fntab -> decoder_init(decoder))
 718                         return false;
 719
 720                 if(!fntab -> process_until_end_of_metadata(decoder))
 721                         return false;
 722         }
 723
 724         return true;
 725 }
 726
 727 FLAC__StreamDecoderWriteStatus write_callback_(const void *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
 728 {
 729         file_info_struct *file_info = (file_info_struct *)client_data;
 730         const unsigned channels = file_info->channels, wide_samples = frame->header.blocksize;
 731         const unsigned bits_per_sample = file_info->bits_per_sample;
 732         FLAC__byte *sample_buffer_start;
 733
 734         (void)decoder;
 735
 736         if(file_info->abort_flag)
 737                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 738
 739         if((sample_buffer_last_ + wide_samples) > (SAMPLE_BUFFER_SIZE / (channels * file_info->sample_format_bytes_per_sample))) {
 740                 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);
 741                 sample_buffer_last_ -= sample_buffer_first_;
 742                 sample_buffer_first_ = 0;
 743         }
 744         sample_buffer_start = sample_buffer_ + sample_buffer_last_ * channels * file_info->sample_format_bytes_per_sample;
 745         if(file_info->has_replaygain && flac_cfg.output.replaygain.enable) {
 746                 FLAC__replaygain_synthesis__apply_gain(
 747                                 sample_buffer_start,
 748                                 !is_big_endian_host_,
 749                                 file_info->sample_format_bytes_per_sample == 1, /* unsigned_data_out */
 750                                 buffer,
 751                                 wide_samples,
 752                                 channels,
 753                                 bits_per_sample,
 754                                 file_info->sample_format_bytes_per_sample * 8,
 755                                 file_info->replay_scale,
 756                                 flac_cfg.output.replaygain.hard_limit,
 757                                 flac_cfg.output.resolution.replaygain.dither,
 758                                 &file_info->dither_context
 759                 );
 760         }
 761         else if(is_big_endian_host_) {
 762                 FLAC__plugin_common__pack_pcm_signed_big_endian(
 763                         sample_buffer_start,
 764                         buffer,
 765                         wide_samples,
 766                         channels,
 767                         bits_per_sample,
 768                         file_info->sample_format_bytes_per_sample * 8
 769                 );
 770         }
 771         else {
 772                 FLAC__plugin_common__pack_pcm_signed_little_endian(
 773                         sample_buffer_start,
 774                         buffer,
 775                         wide_samples,
 776                         channels,
 777                         bits_per_sample,
 778                         file_info->sample_format_bytes_per_sample * 8
 779                 );
 780         }
 781
 782         sample_buffer_last_ += wide_samples;
 783
 784         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
 785 }
 786
 787 void metadata_callback_(const void *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
 788 {
 789         file_info_struct *file_info = (file_info_struct *)client_data;
 790         (void)decoder;
 791         if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
 792                 FLAC__ASSERT(metadata->data.stream_info.total_samples < FLAC__U64L(0x100000000)); /* this plugin can only handle < 4 gigasamples */
 793                 file_info->total_samples = (unsigned)(metadata->data.stream_info.total_samples&0xffffffff);
 794                 file_info->bits_per_sample = metadata->data.stream_info.bits_per_sample;
 795                 file_info->channels = metadata->data.stream_info.channels;
 796                 file_info->sample_rate = metadata->data.stream_info.sample_rate;
 797                 file_info->length_in_msec = (FLAC__uint64)file_info->total_samples * 10 / (file_info->sample_rate / 100);
 798         }
 799         else if(metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
 800                 double gain, peak;
 801                 if(grabbag__replaygain_load_from_vorbiscomment(metadata, flac_cfg.output.replaygain.album_mode, &gain, &peak)) {
 802                         file_info->has_replaygain = true;
 803                         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);
 804                 }
 805         }
 806 }
 807
 808 void error_callback_(const void *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
 809 {
 810         file_info_struct *file_info = (file_info_struct *)client_data;
 811         (void)decoder;
 812         if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
 813                 file_info->abort_flag = true;
 814 }