src/plugin_xmms/plugin.c

   1 /* libxmms-flac - XMMS FLAC input plugin
   2  * Copyright (C) 2000-2009  Josh Coalson
   3  * Copyright (C) 2011-2013  Xiph.Org Foundation
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #include "plugin.h"
  21
  22 #include <limits.h>
  23 #include <pthread.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <stdio.h>
  27 #include <glib.h>
  28 #include <pwd.h>
  29 #include <sys/types.h>
  30 #include <unistd.h>
  31
  32 #include <xmms/plugin.h>
  33 #include <xmms/util.h>
  34 #include <xmms/configfile.h>
  35 #include <xmms/titlestring.h>
  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 extern void FLAC_XMMS__file_info_box(char *filename);
  56
  57 typedef struct {
  58         FLAC__bool abort_flag;
  59         FLAC__bool is_playing;
  60         FLAC__bool is_http_source;
  61         FLAC__bool eof;
  62         FLAC__bool play_thread_open; /* if true, is_playing must also be true */
  63         FLAC__uint64 total_samples;
  64         unsigned bits_per_sample;
  65         unsigned channels;
  66         unsigned sample_rate;
  67         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 */
  68         gchar *title;
  69         AFormat sample_format;
  70         unsigned sample_format_bytes_per_sample;
  71         int seek_to_in_sec;
  72         FLAC__bool has_replaygain;
  73         double replay_scale;
  74         DitherContext dither_context;
  75 } stream_data_struct;
  76
  77 static void FLAC_XMMS__init(void);
  78 static int  FLAC_XMMS__is_our_file(char *filename);
  79 static void FLAC_XMMS__play_file(char *filename);
  80 static void FLAC_XMMS__stop(void);
  81 static void FLAC_XMMS__pause(short p);
  82 static void FLAC_XMMS__seek(int time);
  83 static int  FLAC_XMMS__get_time(void);
  84 static void FLAC_XMMS__cleanup(void);
  85 static void FLAC_XMMS__get_song_info(char *filename, char **title, int *length);
  86
  87 static void *play_loop_(void *arg);
  88
  89 static FLAC__bool safe_decoder_init_(const char *filename, FLAC__StreamDecoder *decoder);
  90 static void safe_decoder_finish_(FLAC__StreamDecoder *decoder);
  91 static void safe_decoder_delete_(FLAC__StreamDecoder *decoder);
  92
  93 static FLAC__StreamDecoderReadStatus http_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
  94 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
  95 static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
  96 static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
  97
  98 InputPlugin flac_ip =
  99 {
 100         NULL,
 101         NULL,
 102         "FLAC Player v" VERSION,
 103         FLAC_XMMS__init,
 104         FLAC_XMMS__aboutbox,
 105         FLAC_XMMS__configure,
 106         FLAC_XMMS__is_our_file,
 107         NULL,
 108         FLAC_XMMS__play_file,
 109         FLAC_XMMS__stop,
 110         FLAC_XMMS__pause,
 111         FLAC_XMMS__seek,
 112         NULL,
 113         FLAC_XMMS__get_time,
 114         NULL,
 115         NULL,
 116         FLAC_XMMS__cleanup,
 117         NULL,
 118         NULL,
 119         NULL,
 120         NULL,
 121         FLAC_XMMS__get_song_info,
 122         FLAC_XMMS__file_info_box,
 123         NULL
 124 };
 125
 126 #define SAMPLES_PER_WRITE 512
 127 #define SAMPLE_BUFFER_SIZE ((FLAC__MAX_BLOCK_SIZE + SAMPLES_PER_WRITE) * FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS * (24/8))
 128 static FLAC__byte sample_buffer_[SAMPLE_BUFFER_SIZE];
 129 static unsigned sample_buffer_first_, sample_buffer_last_;
 130
 131 static FLAC__StreamDecoder *decoder_ = 0;
 132 static stream_data_struct stream_data_;
 133 static pthread_t decode_thread_;
 134 static FLAC__bool audio_error_ = false;
 135 static FLAC__bool is_big_endian_host_;
 136
 137 #define BITRATE_HIST_SEGMENT_MSEC 500
 138 /* 500ms * 50 = 25s should be enough */
 139 #define BITRATE_HIST_SIZE 50
 140 static unsigned bitrate_history_[BITRATE_HIST_SIZE];
 141
 142
 143 InputPlugin *get_iplugin_info(void)
 144 {
 145         flac_ip.description = g_strdup_printf("Reference FLAC Player v%s", FLAC__VERSION_STRING);
 146         return &flac_ip;
 147 }
 148
 149 void set_track_info(const char* title, int length_in_msec)
 150 {
 151         if (stream_data_.is_playing) {
 152                 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);
 153         }
 154 }
 155
 156 static gchar* homedir(void)
 157 {
 158         gchar *result;
 159         char *env_home = getenv("HOME");
 160         if (env_home) {
 161                 result = g_strdup (env_home);
 162         } else {
 163                 uid_t uid = getuid();
 164                 struct passwd *pwent;
 165                 do {
 166                         pwent = getpwent();
 167                 } while (pwent && pwent->pw_uid != uid);
 168                 result = pwent ? g_strdup (pwent->pw_dir) : NULL;
 169                 endpwent();
 170         }
 171         return result;
 172 }
 173
 174 static FLAC__bool is_http_source(const char *source)
 175 {
 176         return 0 == strncasecmp(source, "http://", 7);
 177 }
 178
 179 void FLAC_XMMS__init(void)
 180 {
 181         ConfigFile *cfg;
 182         FLAC__uint32 test = 1;
 183
 184         is_big_endian_host_ = (*((FLAC__byte*)(&test)))? false : true;
 185
 186         flac_cfg.title.tag_override = FALSE;
 187         if (flac_cfg.title.tag_format)
 188                 g_free(flac_cfg.title.tag_format);
 189         flac_cfg.title.convert_char_set = FALSE;
 190
 191         cfg = xmms_cfg_open_default_file();
 192
 193         /* title */
 194
 195         xmms_cfg_read_boolean(cfg, "flac", "title.tag_override", &flac_cfg.title.tag_override);
 196
 197         if(!xmms_cfg_read_string(cfg, "flac", "title.tag_format", &flac_cfg.title.tag_format))
 198                 flac_cfg.title.tag_format = g_strdup("%p - %t");
 199
 200         xmms_cfg_read_boolean(cfg, "flac", "title.convert_char_set", &flac_cfg.title.convert_char_set);
 201
 202         if(!xmms_cfg_read_string(cfg, "flac", "title.user_char_set", &flac_cfg.title.user_char_set))
 203                 flac_cfg.title.user_char_set = FLAC_plugin__charset_get_current();
 204
 205         /* replaygain */
 206
 207         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.enable", &flac_cfg.output.replaygain.enable);
 208
 209         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.album_mode", &flac_cfg.output.replaygain.album_mode);
 210
 211         if(!xmms_cfg_read_int(cfg, "flac", "output.replaygain.preamp", &flac_cfg.output.replaygain.preamp))
 212                 flac_cfg.output.replaygain.preamp = 0;
 213
 214         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.hard_limit", &flac_cfg.output.replaygain.hard_limit);
 215
 216         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.normal.dither_24_to_16", &flac_cfg.output.resolution.normal.dither_24_to_16);
 217         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.replaygain.dither", &flac_cfg.output.resolution.replaygain.dither);
 218
 219         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.noise_shaping", &flac_cfg.output.resolution.replaygain.noise_shaping))
 220                 flac_cfg.output.resolution.replaygain.noise_shaping = 1;
 221
 222         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.bps_out", &flac_cfg.output.resolution.replaygain.bps_out))
 223                 flac_cfg.output.resolution.replaygain.bps_out = 16;
 224
 225         /* stream */
 226
 227         xmms_cfg_read_int(cfg, "flac", "stream.http_buffer_size", &flac_cfg.stream.http_buffer_size);
 228         xmms_cfg_read_int(cfg, "flac", "stream.http_prebuffer", &flac_cfg.stream.http_prebuffer);
 229         xmms_cfg_read_boolean(cfg, "flac", "stream.use_proxy", &flac_cfg.stream.use_proxy);
 230         if(flac_cfg.stream.proxy_host)
 231                 g_free(flac_cfg.stream.proxy_host);
 232         if(!xmms_cfg_read_string(cfg, "flac", "stream.proxy_host", &flac_cfg.stream.proxy_host))
 233                 flac_cfg.stream.proxy_host = g_strdup("");
 234         xmms_cfg_read_int(cfg, "flac", "stream.proxy_port", &flac_cfg.stream.proxy_port);
 235         xmms_cfg_read_boolean(cfg, "flac", "stream.proxy_use_auth", &flac_cfg.stream.proxy_use_auth);
 236         if(flac_cfg.stream.proxy_user)
 237                 g_free(flac_cfg.stream.proxy_user);
 238         flac_cfg.stream.proxy_user = NULL;
 239         xmms_cfg_read_string(cfg, "flac", "stream.proxy_user", &flac_cfg.stream.proxy_user);
 240         if(flac_cfg.stream.proxy_pass)
 241                 g_free(flac_cfg.stream.proxy_pass);
 242         flac_cfg.stream.proxy_pass = NULL;
 243         xmms_cfg_read_string(cfg, "flac", "stream.proxy_pass", &flac_cfg.stream.proxy_pass);
 244         xmms_cfg_read_boolean(cfg, "flac", "stream.save_http_stream", &flac_cfg.stream.save_http_stream);
 245         if (flac_cfg.stream.save_http_path)
 246                 g_free (flac_cfg.stream.save_http_path);
 247         if (!xmms_cfg_read_string(cfg, "flac", "stream.save_http_path", &flac_cfg.stream.save_http_path) || ! *flac_cfg.stream.save_http_path) {
 248                 if (flac_cfg.stream.save_http_path)
 249                         g_free (flac_cfg.stream.save_http_path);
 250                 flac_cfg.stream.save_http_path = homedir();
 251         }
 252         xmms_cfg_read_boolean(cfg, "flac", "stream.cast_title_streaming", &flac_cfg.stream.cast_title_streaming);
 253         xmms_cfg_read_boolean(cfg, "flac", "stream.use_udp_channel", &flac_cfg.stream.use_udp_channel);
 254
 255         decoder_ = FLAC__stream_decoder_new();
 256
 257         xmms_cfg_free(cfg);
 258 }
 259
 260 int FLAC_XMMS__is_our_file(char *filename)
 261 {
 262         char *ext;
 263
 264         ext = strrchr(filename, '.');
 265         if(ext)
 266                 if(!strcasecmp(ext, ".flac") || !strcasecmp(ext, ".fla"))
 267                         return 1;
 268         return 0;
 269 }
 270
 271 void FLAC_XMMS__play_file(char *filename)
 272 {
 273         FILE *f;
 274
 275         sample_buffer_first_ = sample_buffer_last_ = 0;
 276         audio_error_ = false;
 277         stream_data_.abort_flag = false;
 278         stream_data_.is_playing = false;
 279         stream_data_.is_http_source = is_http_source(filename);
 280         stream_data_.eof = false;
 281         stream_data_.play_thread_open = false;
 282         stream_data_.has_replaygain = false;
 283
 284         if(!is_http_source(filename)) {
 285                 if(0 == (f = fopen(filename, "r")))
 286                         return;
 287                 fclose(f);
 288         }
 289
 290         if(decoder_ == 0)
 291                 return;
 292
 293         if(!safe_decoder_init_(filename, decoder_))
 294                 return;
 295
 296         if(stream_data_.has_replaygain && flac_cfg.output.replaygain.enable) {
 297                 if(flac_cfg.output.resolution.replaygain.bps_out == 8) {
 298                         stream_data_.sample_format = FMT_U8;
 299                         stream_data_.sample_format_bytes_per_sample = 1;
 300                 }
 301                 else if(flac_cfg.output.resolution.replaygain.bps_out == 16) {
 302                         stream_data_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
 303                         stream_data_.sample_format_bytes_per_sample = 2;
 304                 }
 305                 else {
 306                         /*@@@ 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); */
 307                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", flac_cfg.output.resolution.replaygain.bps_out);
 308                         safe_decoder_finish_(decoder_);
 309                         return;
 310                 }
 311         }
 312         else {
 313                 if(stream_data_.bits_per_sample == 8) {
 314                         stream_data_.sample_format = FMT_U8;
 315                         stream_data_.sample_format_bytes_per_sample = 1;
 316                 }
 317                 else if(stream_data_.bits_per_sample == 16 || (stream_data_.bits_per_sample == 24 && flac_cfg.output.resolution.normal.dither_24_to_16)) {
 318                         stream_data_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
 319                         stream_data_.sample_format_bytes_per_sample = 2;
 320                 }
 321                 else {
 322                         /*@@@ 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); */
 323                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", stream_data_.bits_per_sample);
 324                         safe_decoder_finish_(decoder_);
 325                         return;
 326                 }
 327         }
 328         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);
 329         stream_data_.is_playing = true;
 330
 331         if(flac_ip.output->open_audio(stream_data_.sample_format, stream_data_.sample_rate, stream_data_.channels) == 0) {
 332                 audio_error_ = true;
 333                 safe_decoder_finish_(decoder_);
 334                 return;
 335         }
 336
 337         stream_data_.title = flac_format_song_title(filename);
 338         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);
 339
 340         stream_data_.seek_to_in_sec = -1;
 341         stream_data_.play_thread_open = true;
 342         pthread_create(&decode_thread_, NULL, play_loop_, NULL);
 343 }
 344
 345 void FLAC_XMMS__stop(void)
 346 {
 347         if(stream_data_.is_playing) {
 348                 stream_data_.is_playing = false;
 349                 if(stream_data_.play_thread_open) {
 350                         stream_data_.play_thread_open = false;
 351                         pthread_join(decode_thread_, NULL);
 352                 }
 353                 flac_ip.output->close_audio();
 354                 safe_decoder_finish_(decoder_);
 355         }
 356 }
 357
 358 void FLAC_XMMS__pause(short p)
 359 {
 360         flac_ip.output->pause(p);
 361 }
 362
 363 void FLAC_XMMS__seek(int time)
 364 {
 365         if(!stream_data_.is_http_source) {
 366                 stream_data_.seek_to_in_sec = time;
 367                 stream_data_.eof = false;
 368
 369                 while(stream_data_.seek_to_in_sec != -1)
 370                         xmms_usleep(10000);
 371         }
 372 }
 373
 374 int FLAC_XMMS__get_time(void)
 375 {
 376         if(audio_error_)
 377                 return -2;
 378         if(!stream_data_.is_playing || (stream_data_.eof && !flac_ip.output->buffer_playing()))
 379                 return -1;
 380         else
 381                 return flac_ip.output->output_time();
 382 }
 383
 384 void FLAC_XMMS__cleanup(void)
 385 {
 386         safe_decoder_delete_(decoder_);
 387         decoder_ = 0;
 388 }
 389
 390 void FLAC_XMMS__get_song_info(char *filename, char **title, int *length_in_msec)
 391 {
 392         FLAC__StreamMetadata streaminfo;
 393
 394         if(0 == filename)
 395                 filename = "";
 396
 397         if(!FLAC__metadata_get_streaminfo(filename, &streaminfo)) {
 398                 /* @@@ how to report the error? */
 399                 if(title) {
 400                         if (!is_http_source(filename)) {
 401                                 static const char *errtitle = "Invalid FLAC File: ";
 402                                 if(strlen(errtitle) + 1 + strlen(filename) + 1 + 1 < strlen(filename)) { /* overflow check */
 403                                         *title = NULL;
 404                                 }
 405                                 else {
 406                                         size_t len = strlen(errtitle) + 1 + strlen(filename) + 1 + 1;
 407                                         *title = g_malloc(len);
 408                                         flac_snprintf(*title, len, "%s\"%s\"", errtitle, filename);
 409                                 }
 410                         } else {
 411                                 *title = NULL;
 412                         }
 413                 }
 414                 if(length_in_msec)
 415                         *length_in_msec = -1;
 416                 return;
 417         }
 418
 419         if(title) {
 420                 *title = flac_format_song_title(filename);
 421         }
 422         if(length_in_msec) {
 423                 FLAC__uint64 l = (FLAC__uint64)((double)streaminfo.data.stream_info.total_samples / (double)streaminfo.data.stream_info.sample_rate * 1000.0 + 0.5);
 424                 if (l > INT_MAX)
 425                         l = INT_MAX;
 426                 *length_in_msec = (int)l;
 427         }
 428 }
 429
 430 /***********************************************************************
 431  * local routines
 432  **********************************************************************/
 433
 434 void *play_loop_(void *arg)
 435 {
 436         unsigned written_time_last = 0, bh_index_last_w = 0, bh_index_last_o = BITRATE_HIST_SIZE, blocksize = 1;
 437         FLAC__uint64 decode_position_last = 0, decode_position_frame_last = 0, decode_position_frame = 0;
 438
 439         (void)arg;
 440
 441         while(stream_data_.is_playing) {
 442                 if(!stream_data_.eof) {
 443                         while(sample_buffer_last_ - sample_buffer_first_ < SAMPLES_PER_WRITE) {
 444                                 unsigned s;
 445
 446                                 s = sample_buffer_last_ - sample_buffer_first_;
 447                                 if(FLAC__stream_decoder_get_state(decoder_) == FLAC__STREAM_DECODER_END_OF_STREAM) {
 448                                         stream_data_.eof = true;
 449                                         break;
 450                                 }
 451                                 else if(!FLAC__stream_decoder_process_single(decoder_)) {
 452                                         /*@@@ this should probably be a dialog */
 453                                         fprintf(stderr, "libxmms-flac: READ ERROR processing frame\n");
 454                                         stream_data_.eof = true;
 455                                         break;
 456                                 }
 457                                 blocksize = sample_buffer_last_ - sample_buffer_first_ - s;
 458                                 decode_position_frame_last = decode_position_frame;
 459                                 if(stream_data_.is_http_source || !FLAC__stream_decoder_get_decode_position(decoder_, &decode_position_frame))
 460                                         decode_position_frame = 0;
 461                         }
 462                         if(sample_buffer_last_ - sample_buffer_first_ > 0) {
 463                                 const unsigned n = min(sample_buffer_last_ - sample_buffer_first_, SAMPLES_PER_WRITE);
 464                                 int bytes = n * stream_data_.channels * stream_data_.sample_format_bytes_per_sample;
 465                                 FLAC__byte *sample_buffer_start = sample_buffer_ + sample_buffer_first_ * stream_data_.channels * stream_data_.sample_format_bytes_per_sample;
 466                                 unsigned written_time, bh_index_w;
 467                                 FLAC__uint64 decode_position;
 468
 469                                 sample_buffer_first_ += n;
 470                                 flac_ip.add_vis_pcm(flac_ip.output->written_time(), stream_data_.sample_format, stream_data_.channels, bytes, sample_buffer_start);
 471                                 while(flac_ip.output->buffer_free() < (int)bytes && stream_data_.is_playing && stream_data_.seek_to_in_sec == -1)
 472                                         xmms_usleep(10000);
 473                                 if(stream_data_.is_playing && stream_data_.seek_to_in_sec == -1)
 474                                         flac_ip.output->write_audio(sample_buffer_start, bytes);
 475
 476                                 /* compute current bitrate */
 477
 478                                 written_time = flac_ip.output->written_time();
 479                                 bh_index_w = written_time / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 480                                 if(bh_index_w != bh_index_last_w) {
 481                                         bh_index_last_w = bh_index_w;
 482                                         decode_position = decode_position_frame - (double)(sample_buffer_last_ - sample_buffer_first_) * (double)(decode_position_frame - decode_position_frame_last) / (double)blocksize;
 483                                         bitrate_history_[(bh_index_w + BITRATE_HIST_SIZE - 1) % BITRATE_HIST_SIZE] =
 484                                                 decode_position > decode_position_last && written_time > written_time_last ?
 485                                                         8000 * (decode_position - decode_position_last) / (written_time - written_time_last) :
 486                                                         stream_data_.sample_rate * stream_data_.channels * stream_data_.bits_per_sample;
 487                                         decode_position_last = decode_position;
 488                                         written_time_last = written_time;
 489                                 }
 490                         }
 491                         else {
 492                                 stream_data_.eof = true;
 493                                 xmms_usleep(10000);
 494                         }
 495                 }
 496                 else
 497                         xmms_usleep(10000);
 498                 if(!stream_data_.is_http_source && stream_data_.seek_to_in_sec != -1) {
 499                         const double distance = (double)stream_data_.seek_to_in_sec * 1000.0 / (double)stream_data_.length_in_msec;
 500                         FLAC__uint64 target_sample = (FLAC__uint64)(distance * (double)stream_data_.total_samples);
 501                         if(stream_data_.total_samples > 0 && target_sample >= stream_data_.total_samples)
 502                                 target_sample = stream_data_.total_samples - 1;
 503                         if(FLAC__stream_decoder_seek_absolute(decoder_, target_sample)) {
 504                                 flac_ip.output->flush(stream_data_.seek_to_in_sec * 1000);
 505                                 bh_index_last_w = bh_index_last_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 506                                 if(!FLAC__stream_decoder_get_decode_position(decoder_, &decode_position_frame))
 507                                         decode_position_frame = 0;
 508                                 stream_data_.eof = false;
 509                                 sample_buffer_first_ = sample_buffer_last_ = 0;
 510                         }
 511                         else if(FLAC__stream_decoder_get_state(decoder_) == FLAC__STREAM_DECODER_SEEK_ERROR) {
 512                                 /*@@@ this should probably be a dialog */
 513                                 fprintf(stderr, "libxmms-flac: SEEK ERROR\n");
 514                                 FLAC__stream_decoder_flush(decoder_);
 515                                 stream_data_.eof = false;
 516                                 sample_buffer_first_ = sample_buffer_last_ = 0;
 517                         }
 518                         stream_data_.seek_to_in_sec = -1;
 519                 }
 520                 else {
 521                         /* display the right bitrate from history */
 522                         unsigned bh_index_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
 523                         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) {
 524                                 bh_index_last_o = bh_index_o;
 525                                 flac_ip.set_info(stream_data_.title, stream_data_.length_in_msec, bitrate_history_[bh_index_o], stream_data_.sample_rate, stream_data_.channels);
 526                         }
 527                 }
 528         }
 529
 530         safe_decoder_finish_(decoder_);
 531
 532         /* are these two calls necessary? */
 533         flac_ip.output->buffer_free();
 534         flac_ip.output->buffer_free();
 535
 536         g_free(stream_data_.title);
 537
 538         pthread_exit(NULL);
 539         return 0; /* to silence the compiler warning about not returning a value */
 540 }
 541
 542 FLAC__bool safe_decoder_init_(const char *filename, FLAC__StreamDecoder *decoder)
 543 {
 544         if(decoder == 0)
 545                 return false;
 546
 547         safe_decoder_finish_(decoder);
 548
 549         FLAC__stream_decoder_set_md5_checking(decoder, false);
 550         FLAC__stream_decoder_set_metadata_ignore_all(decoder);
 551         FLAC__stream_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO);
 552         FLAC__stream_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_VORBIS_COMMENT);
 553         if(stream_data_.is_http_source) {
 554                 flac_http_open(filename, 0);
 555                 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)
 556                         return false;
 557         }
 558         else {
 559                 if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, /*client_data=*/&stream_data_) != FLAC__STREAM_DECODER_INIT_STATUS_OK)
 560                         return false;
 561         }
 562
 563         if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder))
 564                 return false;
 565
 566         return true;
 567 }
 568
 569 void safe_decoder_finish_(FLAC__StreamDecoder *decoder)
 570 {
 571         if(decoder && FLAC__stream_decoder_get_state(decoder) != FLAC__STREAM_DECODER_UNINITIALIZED)
 572                 (void)FLAC__stream_decoder_finish(decoder);
 573         if(stream_data_.is_http_source)
 574                 flac_http_close();
 575 }
 576
 577 void safe_decoder_delete_(FLAC__StreamDecoder *decoder)
 578 {
 579         if(decoder) {
 580                 safe_decoder_finish_(decoder);
 581                 FLAC__stream_decoder_delete(decoder);
 582         }
 583 }
 584
 585 FLAC__StreamDecoderReadStatus http_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
 586 {
 587         (void)decoder;
 588         (void)client_data;
 589         *bytes = flac_http_read(buffer, *bytes);
 590         return *bytes ? FLAC__STREAM_DECODER_READ_STATUS_CONTINUE : FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
 591 }
 592
 593 FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
 594 {
 595         stream_data_struct *stream_data = (stream_data_struct *)client_data;
 596         const unsigned channels = stream_data->channels, wide_samples = frame->header.blocksize;
 597         const unsigned bits_per_sample = stream_data->bits_per_sample;
 598         FLAC__byte *sample_buffer_start;
 599
 600         (void)decoder;
 601
 602         if(stream_data->abort_flag)
 603                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 604
 605         if((sample_buffer_last_ + wide_samples) > (SAMPLE_BUFFER_SIZE / (channels * stream_data->sample_format_bytes_per_sample))) {
 606                 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);
 607                 sample_buffer_last_ -= sample_buffer_first_;
 608                 sample_buffer_first_ = 0;
 609         }
 610         sample_buffer_start = sample_buffer_ + sample_buffer_last_ * channels * stream_data->sample_format_bytes_per_sample;
 611         if(stream_data->has_replaygain && flac_cfg.output.replaygain.enable) {
 612                 FLAC__replaygain_synthesis__apply_gain(
 613                                 sample_buffer_start,
 614                                 !is_big_endian_host_,
 615                                 stream_data->sample_format_bytes_per_sample == 1, /* unsigned_data_out */
 616                                 buffer,
 617                                 wide_samples,
 618                                 channels,
 619                                 bits_per_sample,
 620                                 stream_data->sample_format_bytes_per_sample * 8,
 621                                 stream_data->replay_scale,
 622                                 flac_cfg.output.replaygain.hard_limit,
 623                                 flac_cfg.output.resolution.replaygain.dither,
 624                                 &stream_data->dither_context
 625                 );
 626         }
 627         else if(is_big_endian_host_) {
 628                 FLAC__plugin_common__pack_pcm_signed_big_endian(
 629                         sample_buffer_start,
 630                         buffer,
 631                         wide_samples,
 632                         channels,
 633                         bits_per_sample,
 634                         stream_data->sample_format_bytes_per_sample * 8
 635                 );
 636         }
 637         else {
 638                 FLAC__plugin_common__pack_pcm_signed_little_endian(
 639                         sample_buffer_start,
 640                         buffer,
 641                         wide_samples,
 642                         channels,
 643                         bits_per_sample,
 644                         stream_data->sample_format_bytes_per_sample * 8
 645                 );
 646         }
 647
 648         sample_buffer_last_ += wide_samples;
 649
 650         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
 651 }
 652
 653 void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
 654 {
 655         stream_data_struct *stream_data = (stream_data_struct *)client_data;
 656         (void)decoder;
 657         if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
 658                 stream_data->total_samples = metadata->data.stream_info.total_samples;
 659                 stream_data->bits_per_sample = metadata->data.stream_info.bits_per_sample;
 660                 stream_data->channels = metadata->data.stream_info.channels;
 661                 stream_data->sample_rate = metadata->data.stream_info.sample_rate;
 662                 {
 663                         FLAC__uint64 l = (FLAC__uint64)((double)stream_data->total_samples / (double)stream_data->sample_rate * 1000.0 + 0.5);
 664                         if (l > INT_MAX)
 665                                 l = INT_MAX;
 666                         stream_data->length_in_msec = (int)l;
 667                 }
 668         }
 669         else if(metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
 670                 double reference, gain, peak;
 671                 if(grabbag__replaygain_load_from_vorbiscomment(metadata, flac_cfg.output.replaygain.album_mode, /*strict=*/false, &reference, &gain, &peak)) {
 672                         stream_data->has_replaygain = true;
 673                         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);
 674                 }
 675         }
 676 }
 677
 678 void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
 679 {
 680         stream_data_struct *stream_data = (stream_data_struct *)client_data;
 681         (void)decoder;
 682         if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
 683                 stream_data->abort_flag = true;
 684 }