complete largefile support
[flac.git] / src / plugin_xmms / plugin.c
1 /* libxmms-flac - XMMS FLAC input plugin
2  * Copyright (C) 2000,2001,2002,2003,2004,2005,2006  Josh Coalson
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License
6  * as published by the Free Software Foundation; either version 2
7  * of the License, or (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
17  */
18
19 #if HAVE_CONFIG_H
20 #  include <config.h>
21 #endif
22
23 #include <limits.h>
24 #include <pthread.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <stdio.h>
28 #include <glib.h>
29 #include <pwd.h>
30 #include <sys/types.h>
31 #include <unistd.h>
32
33 #include <xmms/plugin.h>
34 #include <xmms/util.h>
35 #include <xmms/configfile.h>
36 #include <xmms/titlestring.h>
37
38 #ifdef HAVE_LANGINFO_CODESET
39 #include <langinfo.h>
40 #endif
41
42 #include "FLAC/all.h"
43 #include "plugin_common/all.h"
44 #include "share/grabbag.h"
45 #include "share/replaygain_synthesis.h"
46 #include "configure.h"
47 #include "charset.h"
48 #include "http.h"
49 #include "tag.h"
50
51 #ifdef min
52 #undef min
53 #endif
54 #define min(x,y) ((x)<(y)?(x):(y))
55
56 extern void FLAC_XMMS__file_info_box(char *filename);
57
58 typedef struct {
59         FLAC__bool abort_flag;
60         FLAC__bool is_playing;
61         FLAC__bool 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 } file_info_struct;
76
77 typedef FLAC__StreamDecoderWriteStatus (*WriteCallback) (const void *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
78 typedef void (*MetadataCallback) (const void *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
79 typedef void (*ErrorCallback) (const void *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
80
81 typedef struct {
82         FLAC__bool seekable;
83         void* (*new_decoder) (void);
84         FLAC__bool (*set_md5_checking) (void *decoder, FLAC__bool value);
85         FLAC__bool (*set_source) (void *decoder, const char* source);
86         FLAC__bool (*set_metadata_ignore_all) (void *decoder);
87         FLAC__bool (*set_metadata_respond) (void *decoder, FLAC__MetadataType type);
88         FLAC__bool (*set_write_callback) (void *decoder, WriteCallback value);
89         FLAC__bool (*set_metadata_callback) (void *decoder, MetadataCallback value);
90         FLAC__bool (*set_error_callback) (void *decoder, ErrorCallback value);
91         FLAC__bool (*set_client_data) (void *decoder, void *value);
92         FLAC__bool (*decoder_init) (void *decoder);
93         void (*safe_decoder_finish) (void *decoder);
94         void (*safe_decoder_delete) (void *decoder);
95         FLAC__bool (*process_until_end_of_metadata) (void *decoder);
96         FLAC__bool (*process_single) (void *decoder);
97         FLAC__bool (*is_eof) (void *decoder);
98 } decoder_funcs_t;
99
100 #define NUM_DECODER_TYPES 2
101 typedef enum {
102         DECODER_FILE,
103         DECODER_HTTP
104 } decoder_t;
105
106 static void FLAC_XMMS__init();
107 static int  FLAC_XMMS__is_our_file(char *filename);
108 static void FLAC_XMMS__play_file(char *filename);
109 static void FLAC_XMMS__stop();
110 static void FLAC_XMMS__pause(short p);
111 static void FLAC_XMMS__seek(int time);
112 static int  FLAC_XMMS__get_time();
113 static void FLAC_XMMS__cleanup();
114 static void FLAC_XMMS__get_song_info(char *filename, char **title, int *length);
115
116 static void *play_loop_(void *arg);
117
118 static FLAC__bool safe_decoder_init_(const char *filename, void **decoderp, decoder_funcs_t const ** fnsp);
119 static void file_decoder_safe_decoder_finish_(void *decoder);
120 static void file_decoder_safe_decoder_delete_(void *decoder);
121 static FLAC__StreamDecoderWriteStatus write_callback_(const void *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
122 static void metadata_callback_(const void *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
123 static void error_callback_(const void *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
124
125 static void init_decoder_func_tables();
126 static decoder_t source_to_decoder_type (const char *source);
127
128 InputPlugin flac_ip =
129 {
130         NULL,
131         NULL,
132         "FLAC Player v" VERSION,
133         FLAC_XMMS__init,
134         FLAC_XMMS__aboutbox,
135         FLAC_XMMS__configure,
136         FLAC_XMMS__is_our_file,
137         NULL,
138         FLAC_XMMS__play_file,
139         FLAC_XMMS__stop,
140         FLAC_XMMS__pause,
141         FLAC_XMMS__seek,
142         NULL,
143         FLAC_XMMS__get_time,
144         NULL,
145         NULL,
146         FLAC_XMMS__cleanup,
147         NULL,
148         NULL,
149         NULL,
150         NULL,
151         FLAC_XMMS__get_song_info,
152         FLAC_XMMS__file_info_box,
153         NULL
154 };
155
156 #define SAMPLES_PER_WRITE 512
157 #define SAMPLE_BUFFER_SIZE ((FLAC__MAX_BLOCK_SIZE + SAMPLES_PER_WRITE) * FLAC_PLUGIN__MAX_SUPPORTED_CHANNELS * (24/8))
158 static FLAC__byte sample_buffer_[SAMPLE_BUFFER_SIZE];
159 static unsigned sample_buffer_first_, sample_buffer_last_;
160
161 static void *decoder_ = 0;
162 static file_info_struct file_info_;
163 static pthread_t decode_thread_;
164 static FLAC__bool audio_error_ = false;
165 static FLAC__bool is_big_endian_host_;
166
167 #define BITRATE_HIST_SEGMENT_MSEC 500
168 /* 500ms * 50 = 25s should be enough */
169 #define BITRATE_HIST_SIZE 50
170 static unsigned bitrate_history_[BITRATE_HIST_SIZE];
171
172 /* A table of sets of decoder functions, indexed by decoder_t */
173 static const decoder_funcs_t* DECODER_FUNCS[NUM_DECODER_TYPES];
174
175 static decoder_funcs_t const * decoder_func_table_;
176
177
178 InputPlugin *get_iplugin_info()
179 {
180         flac_ip.description = g_strdup_printf("Reference FLAC Player v%s", FLAC__VERSION_STRING);
181         return &flac_ip;
182 }
183
184 void set_track_info(const char* title, int length_in_msec)
185 {
186         if (file_info_.is_playing) {
187                 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);
188         }
189 }
190
191 static gchar* homedir()
192 {
193         gchar *result;
194         char *env_home = getenv("HOME");
195         if (env_home) {
196                 result = g_strdup (env_home);
197         } else {
198                 uid_t uid = getuid();
199                 struct passwd *pwent;
200                 do {
201                         pwent = getpwent();
202                 } while (pwent && pwent->pw_uid != uid);
203                 result = pwent ? g_strdup (pwent->pw_dir) : NULL;
204                 endpwent();
205         }
206         return result;
207 }
208
209 void FLAC_XMMS__init()
210 {
211         ConfigFile *cfg;
212         FLAC__uint32 test = 1;
213
214         is_big_endian_host_ = (*((FLAC__byte*)(&test)))? false : true;
215
216         flac_cfg.title.tag_override = FALSE;
217         if (flac_cfg.title.tag_format)
218                 g_free(flac_cfg.title.tag_format);
219         flac_cfg.title.convert_char_set = FALSE;
220
221         cfg = xmms_cfg_open_default_file();
222
223         /* title */
224
225         xmms_cfg_read_boolean(cfg, "flac", "title.tag_override", &flac_cfg.title.tag_override);
226
227         if(!xmms_cfg_read_string(cfg, "flac", "title.tag_format", &flac_cfg.title.tag_format))
228                 flac_cfg.title.tag_format = g_strdup("%p - %t");
229
230         xmms_cfg_read_boolean(cfg, "flac", "title.convert_char_set", &flac_cfg.title.convert_char_set);
231
232         if(!xmms_cfg_read_string(cfg, "flac", "title.user_char_set", &flac_cfg.title.user_char_set))
233                 flac_cfg.title.user_char_set = FLAC_plugin__charset_get_current();
234
235         /* replaygain */
236
237         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.enable", &flac_cfg.output.replaygain.enable);
238
239         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.album_mode", &flac_cfg.output.replaygain.album_mode);
240
241         if(!xmms_cfg_read_int(cfg, "flac", "output.replaygain.preamp", &flac_cfg.output.replaygain.preamp))
242                 flac_cfg.output.replaygain.preamp = 0;
243
244         xmms_cfg_read_boolean(cfg, "flac", "output.replaygain.hard_limit", &flac_cfg.output.replaygain.hard_limit);
245
246         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.normal.dither_24_to_16", &flac_cfg.output.resolution.normal.dither_24_to_16);
247         xmms_cfg_read_boolean(cfg, "flac", "output.resolution.replaygain.dither", &flac_cfg.output.resolution.replaygain.dither);
248
249         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.noise_shaping", &flac_cfg.output.resolution.replaygain.noise_shaping))
250                 flac_cfg.output.resolution.replaygain.noise_shaping = 1;
251
252         if(!xmms_cfg_read_int(cfg, "flac", "output.resolution.replaygain.bps_out", &flac_cfg.output.resolution.replaygain.bps_out))
253                 flac_cfg.output.resolution.replaygain.bps_out = 16;
254
255         /* stream */
256
257         xmms_cfg_read_int(cfg, "flac", "stream.http_buffer_size", &flac_cfg.stream.http_buffer_size);
258         xmms_cfg_read_int(cfg, "flac", "stream.http_prebuffer", &flac_cfg.stream.http_prebuffer);
259         xmms_cfg_read_boolean(cfg, "flac", "stream.use_proxy", &flac_cfg.stream.use_proxy);
260         if(flac_cfg.stream.proxy_host)
261                 g_free(flac_cfg.stream.proxy_host);
262         if(!xmms_cfg_read_string(cfg, "flac", "stream.proxy_host", &flac_cfg.stream.proxy_host))
263                 flac_cfg.stream.proxy_host = g_strdup("");
264         xmms_cfg_read_int(cfg, "flac", "stream.proxy_port", &flac_cfg.stream.proxy_port);
265         xmms_cfg_read_boolean(cfg, "flac", "stream.proxy_use_auth", &flac_cfg.stream.proxy_use_auth);
266         if(flac_cfg.stream.proxy_user)
267                 g_free(flac_cfg.stream.proxy_user);
268         flac_cfg.stream.proxy_user = NULL;
269         xmms_cfg_read_string(cfg, "flac", "stream.proxy_user", &flac_cfg.stream.proxy_user);
270         if(flac_cfg.stream.proxy_pass)
271                 g_free(flac_cfg.stream.proxy_pass);
272         flac_cfg.stream.proxy_pass = NULL;
273         xmms_cfg_read_string(cfg, "flac", "stream.proxy_pass", &flac_cfg.stream.proxy_pass);
274         xmms_cfg_read_boolean(cfg, "flac", "stream.save_http_stream", &flac_cfg.stream.save_http_stream);
275         if (flac_cfg.stream.save_http_path)
276                 g_free (flac_cfg.stream.save_http_path);
277         if (!xmms_cfg_read_string(cfg, "flac", "stream.save_http_path", &flac_cfg.stream.save_http_path) || ! *flac_cfg.stream.save_http_path) {
278                 if (flac_cfg.stream.save_http_path)
279                         g_free (flac_cfg.stream.save_http_path);
280                 flac_cfg.stream.save_http_path = homedir();
281         }
282         xmms_cfg_read_boolean(cfg, "flac", "stream.cast_title_streaming", &flac_cfg.stream.cast_title_streaming);
283         xmms_cfg_read_boolean(cfg, "flac", "stream.use_udp_channel", &flac_cfg.stream.use_udp_channel);
284
285         init_decoder_func_tables();
286         decoder_func_table_ = DECODER_FUNCS [DECODER_FILE];
287         decoder_ = decoder_func_table_ -> new_decoder();
288
289         xmms_cfg_free(cfg);
290 }
291
292 int FLAC_XMMS__is_our_file(char *filename)
293 {
294         char *ext;
295
296         ext = strrchr(filename, '.');
297         if(ext)
298                 if(!strcasecmp(ext, ".flac") || !strcasecmp(ext, ".fla"))
299                         return 1;
300         return 0;
301 }
302
303 void FLAC_XMMS__play_file(char *filename)
304 {
305         FILE *f;
306
307         sample_buffer_first_ = sample_buffer_last_ = 0;
308         audio_error_ = false;
309         file_info_.abort_flag = false;
310         file_info_.is_playing = false;
311         file_info_.eof = false;
312         file_info_.play_thread_open = false;
313         file_info_.has_replaygain = false;
314
315         if (source_to_decoder_type (filename) == DECODER_FILE) {
316                 if(0 == (f = fopen(filename, "r")))
317                         return;
318                 fclose(f);
319         }
320
321         if(decoder_ == 0)
322                 return;
323
324         if(!safe_decoder_init_(filename, &decoder_, &decoder_func_table_))
325                 return;
326
327         if(file_info_.has_replaygain && flac_cfg.output.replaygain.enable) {
328                 if(flac_cfg.output.resolution.replaygain.bps_out == 8) {
329                         file_info_.sample_format = FMT_U8;
330                         file_info_.sample_format_bytes_per_sample = 1;
331                 }
332                 else if(flac_cfg.output.resolution.replaygain.bps_out == 16) {
333                         file_info_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
334                         file_info_.sample_format_bytes_per_sample = 2;
335                 }
336                 else {
337                         /*@@@ 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); */
338                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", flac_cfg.output.resolution.replaygain.bps_out);
339                         decoder_func_table_ -> safe_decoder_finish(decoder_);
340                         return;
341                 }
342         }
343         else {
344                 if(file_info_.bits_per_sample == 8) {
345                         file_info_.sample_format = FMT_U8;
346                         file_info_.sample_format_bytes_per_sample = 1;
347                 }
348                 else if(file_info_.bits_per_sample == 16 || (file_info_.bits_per_sample == 24 && flac_cfg.output.resolution.normal.dither_24_to_16)) {
349                         file_info_.sample_format = (is_big_endian_host_) ? FMT_S16_BE : FMT_S16_LE;
350                         file_info_.sample_format_bytes_per_sample = 2;
351                 }
352                 else {
353                         /*@@@ 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); */
354                         fprintf(stderr, "libxmms-flac: can't handle %d bit output\n", file_info_.bits_per_sample);
355                         decoder_func_table_ -> safe_decoder_finish(decoder_);
356                         return;
357                 }
358         }
359         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);
360         file_info_.is_playing = true;
361
362         if(flac_ip.output->open_audio(file_info_.sample_format, file_info_.sample_rate, file_info_.channels) == 0) {
363                 audio_error_ = true;
364                 decoder_func_table_ -> safe_decoder_finish(decoder_);
365                 return;
366         }
367
368         file_info_.title = flac_format_song_title(filename);
369         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);
370
371         file_info_.seek_to_in_sec = -1;
372         file_info_.play_thread_open = true;
373         pthread_create(&decode_thread_, NULL, play_loop_, NULL);
374 }
375
376 void FLAC_XMMS__stop()
377 {
378         if(file_info_.is_playing) {
379                 file_info_.is_playing = false;
380                 if(file_info_.play_thread_open) {
381                         file_info_.play_thread_open = false;
382                         pthread_join(decode_thread_, NULL);
383                 }
384                 flac_ip.output->close_audio();
385                 decoder_func_table_ -> safe_decoder_finish (decoder_);
386         }
387 }
388
389 void FLAC_XMMS__pause(short p)
390 {
391         flac_ip.output->pause(p);
392 }
393
394 void FLAC_XMMS__seek(int time)
395 {
396         if (decoder_func_table_->seekable) {
397                 file_info_.seek_to_in_sec = time;
398                 file_info_.eof = false;
399
400                 while(file_info_.seek_to_in_sec != -1)
401                         xmms_usleep(10000);
402         }
403 }
404
405 int FLAC_XMMS__get_time()
406 {
407         if(audio_error_)
408                 return -2;
409         if(!file_info_.is_playing || (file_info_.eof && !flac_ip.output->buffer_playing()))
410                 return -1;
411         else
412                 return flac_ip.output->output_time();
413 }
414
415 void FLAC_XMMS__cleanup()
416 {
417         decoder_func_table_ -> safe_decoder_delete(decoder_);
418         decoder_ = 0;
419 }
420
421 void FLAC_XMMS__get_song_info(char *filename, char **title, int *length_in_msec)
422 {
423         FLAC__StreamMetadata streaminfo;
424
425         if(0 == filename)
426                 filename = "";
427
428         if(!FLAC__metadata_get_streaminfo(filename, &streaminfo)) {
429                 /* @@@ how to report the error? */
430                 if(title) {
431                         if (source_to_decoder_type (filename) == DECODER_FILE) {
432                                 static const char *errtitle = "Invalid FLAC File: ";
433                                 *title = g_malloc(strlen(errtitle) + 1 + strlen(filename) + 1 + 1);
434                                 sprintf(*title, "%s\"%s\"", errtitle, filename);
435                         } else {
436                                 *title = NULL;
437                         }
438                 }
439                 if(length_in_msec)
440                         *length_in_msec = -1;
441                 return;
442         }
443
444         if(title) {
445                 *title = flac_format_song_title(filename);
446         }
447         if(length_in_msec) {
448                 FLAC__uint64 l = (FLAC__uint64)((double)streaminfo.data.stream_info.total_samples / (double)streaminfo.data.stream_info.sample_rate * 1000.0 + 0.5);
449                 if (l > INT_MAX)
450                         l = INT_MAX;
451                 *length_in_msec = (int)l;
452         }
453 }
454
455 /***********************************************************************
456  * local routines
457  **********************************************************************/
458
459 void *play_loop_(void *arg)
460 {
461         unsigned written_time_last = 0, bh_index_last_w = 0, bh_index_last_o = BITRATE_HIST_SIZE, blocksize = 1;
462         FLAC__uint64 decode_position_last = 0, decode_position_frame_last = 0, decode_position_frame = 0;
463
464         (void)arg;
465
466         while(file_info_.is_playing) {
467                 if(!file_info_.eof) {
468                         while(sample_buffer_last_ - sample_buffer_first_ < SAMPLES_PER_WRITE) {
469                                 unsigned s;
470
471                                 s = sample_buffer_last_ - sample_buffer_first_;
472                                 if(decoder_func_table_ -> is_eof(decoder_)) {
473                                         file_info_.eof = true;
474                                         break;
475                                 }
476                                 else if (!decoder_func_table_ -> process_single(decoder_)) {
477                                         /*@@@ this should probably be a dialog */
478                                         fprintf(stderr, "libxmms-flac: READ ERROR processing frame\n");
479                                         file_info_.eof = true;
480                                         break;
481                                 }
482                                 blocksize = sample_buffer_last_ - sample_buffer_first_ - s;
483                                 decode_position_frame_last = decode_position_frame;
484                                 if(!decoder_func_table_->seekable || !FLAC__file_decoder_get_decode_position(decoder_, &decode_position_frame))
485                                         decode_position_frame = 0;
486                         }
487                         if(sample_buffer_last_ - sample_buffer_first_ > 0) {
488                                 const unsigned n = min(sample_buffer_last_ - sample_buffer_first_, SAMPLES_PER_WRITE);
489                                 int bytes = n * file_info_.channels * file_info_.sample_format_bytes_per_sample;
490                                 FLAC__byte *sample_buffer_start = sample_buffer_ + sample_buffer_first_ * file_info_.channels * file_info_.sample_format_bytes_per_sample;
491                                 unsigned written_time, bh_index_w;
492                                 FLAC__uint64 decode_position;
493
494                                 sample_buffer_first_ += n;
495                                 flac_ip.add_vis_pcm(flac_ip.output->written_time(), file_info_.sample_format, file_info_.channels, bytes, sample_buffer_start);
496                                 while(flac_ip.output->buffer_free() < (int)bytes && file_info_.is_playing && file_info_.seek_to_in_sec == -1)
497                                         xmms_usleep(10000);
498                                 if(file_info_.is_playing && file_info_.seek_to_in_sec == -1)
499                                         flac_ip.output->write_audio(sample_buffer_start, bytes);
500
501                                 /* compute current bitrate */
502
503                                 written_time = flac_ip.output->written_time();
504                                 bh_index_w = written_time / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
505                                 if(bh_index_w != bh_index_last_w) {
506                                         bh_index_last_w = bh_index_w;
507                                         decode_position = decode_position_frame - (double)(sample_buffer_last_ - sample_buffer_first_) * (double)(decode_position_frame - decode_position_frame_last) / (double)blocksize;
508                                         bitrate_history_[(bh_index_w + BITRATE_HIST_SIZE - 1) % BITRATE_HIST_SIZE] =
509                                                 decode_position > decode_position_last && written_time > written_time_last ?
510                                                         8000 * (decode_position - decode_position_last) / (written_time - written_time_last) :
511                                                         file_info_.sample_rate * file_info_.channels * file_info_.bits_per_sample;
512                                         decode_position_last = decode_position;
513                                         written_time_last = written_time;
514                                 }
515                         }
516                         else {
517                                 file_info_.eof = true;
518                                 xmms_usleep(10000);
519                         }
520                 }
521                 else
522                         xmms_usleep(10000);
523                 if(decoder_func_table_->seekable && file_info_.seek_to_in_sec != -1) {
524                         const double distance = (double)file_info_.seek_to_in_sec * 1000.0 / (double)file_info_.length_in_msec;
525                         FLAC__uint64 target_sample = (FLAC__uint64)(distance * (double)file_info_.total_samples);
526                         if(FLAC__file_decoder_seek_absolute(decoder_, target_sample)) {
527                                 flac_ip.output->flush(file_info_.seek_to_in_sec * 1000);
528                                 bh_index_last_w = bh_index_last_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
529                                 if(!FLAC__file_decoder_get_decode_position(decoder_, &decode_position_frame))
530                                         decode_position_frame = 0;
531                                 file_info_.seek_to_in_sec = -1;
532                                 file_info_.eof = false;
533                                 sample_buffer_first_ = sample_buffer_last_ = 0;
534                         }
535                 }
536                 else {
537                         /* display the right bitrate from history */
538                         unsigned bh_index_o = flac_ip.output->output_time() / BITRATE_HIST_SEGMENT_MSEC % BITRATE_HIST_SIZE;
539                         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) {
540                                 bh_index_last_o = bh_index_o;
541                                 flac_ip.set_info(file_info_.title, file_info_.length_in_msec, bitrate_history_[bh_index_o], file_info_.sample_rate, file_info_.channels);
542                         }
543                 }
544         }
545
546         decoder_func_table_ -> safe_decoder_finish(decoder_);
547
548         /* are these two calls necessary? */
549         flac_ip.output->buffer_free();
550         flac_ip.output->buffer_free();
551
552         g_free(file_info_.title);
553
554         pthread_exit(NULL);
555         return 0; /* to silence the compiler warning about not returning a value */
556 }
557
558 /*********** File decoder functions */
559
560 static FLAC__bool file_decoder_init (void *decoder)
561 {
562         return FLAC__file_decoder_init( (FLAC__FileDecoder*) decoder) == FLAC__FILE_DECODER_OK;
563 }
564
565 static void file_decoder_safe_decoder_finish_(void *decoder)
566 {
567         if(decoder && FLAC__file_decoder_get_state((FLAC__FileDecoder *) decoder) != FLAC__FILE_DECODER_UNINITIALIZED)
568                 FLAC__file_decoder_finish((FLAC__FileDecoder *) decoder);
569 }
570
571 static void file_decoder_safe_decoder_delete_(void *decoder)
572 {
573         if(decoder) {
574                 file_decoder_safe_decoder_finish_(decoder);
575                 FLAC__file_decoder_delete( (FLAC__FileDecoder *) decoder);
576         }
577 }
578
579 static FLAC__bool file_decoder_is_eof(void *decoder)
580 {
581         return FLAC__file_decoder_get_state((FLAC__FileDecoder *) decoder) == FLAC__FILE_DECODER_END_OF_FILE;
582 }
583
584 static const decoder_funcs_t FILE_DECODER_FUNCTIONS = {
585         true,
586         (void* (*) (void)) FLAC__file_decoder_new,
587         (FLAC__bool (*) (void *, FLAC__bool)) FLAC__file_decoder_set_md5_checking,
588         (FLAC__bool (*) (void *, const char*)) FLAC__file_decoder_set_filename,
589         (FLAC__bool (*) (void *)) FLAC__file_decoder_set_metadata_ignore_all,
590         (FLAC__bool (*) (void *, FLAC__MetadataType)) FLAC__file_decoder_set_metadata_respond,
591         (FLAC__bool (*) (void *, WriteCallback)) FLAC__file_decoder_set_write_callback,
592         (FLAC__bool (*) (void *, MetadataCallback)) FLAC__file_decoder_set_metadata_callback,
593         (FLAC__bool (*) (void *, ErrorCallback)) FLAC__file_decoder_set_error_callback,
594         (FLAC__bool (*) (void *, void *)) FLAC__file_decoder_set_client_data,
595         (FLAC__bool (*) (void *)) file_decoder_init,
596         (void (*) (void *)) file_decoder_safe_decoder_finish_,
597         (void (*) (void *)) file_decoder_safe_decoder_delete_,
598         (FLAC__bool (*) (void *)) FLAC__file_decoder_process_until_end_of_metadata,
599         (FLAC__bool (*) (void *)) FLAC__file_decoder_process_single,
600         file_decoder_is_eof
601 };
602
603 /*********** HTTP decoder functions */
604
605 static gchar *url_;
606
607 static FLAC__bool http_decoder_set_md5_checking (void *decoder, FLAC__bool value)
608 {
609         (void) value;
610         // operation unsupported
611         return FLAC__stream_decoder_get_state ((const FLAC__StreamDecoder *) decoder) == FLAC__STREAM_DECODER_UNINITIALIZED;
612 }
613
614 static FLAC__bool http_decoder_set_url (void *decoder, const char* url)
615 {
616         (void) decoder;
617         url_ = g_strdup (url);
618         return true;
619 }
620
621 static FLAC__StreamDecoderReadStatus http_decoder_read_callback (const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data)
622 {
623         (void) decoder;
624         (void) client_data;
625         *bytes = flac_http_read (buffer, *bytes);
626         return *bytes ? FLAC__STREAM_DECODER_READ_STATUS_CONTINUE : FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
627 }
628
629 static FLAC__bool http_decoder_init (void *decoder)
630 {
631         flac_http_open (url_, 0);
632         g_free (url_);
633         FLAC__stream_decoder_set_read_callback (decoder, http_decoder_read_callback);
634         return FLAC__stream_decoder_init( (FLAC__StreamDecoder*) decoder) == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
635 }
636
637 static void http_decoder_safe_decoder_finish_(void *decoder)
638 {
639         if(decoder && FLAC__stream_decoder_get_state((FLAC__StreamDecoder *) decoder) != FLAC__STREAM_DECODER_UNINITIALIZED) {
640                 FLAC__stream_decoder_finish((FLAC__StreamDecoder *) decoder);
641                 flac_http_close();
642         }
643 }
644
645 static void http_decoder_safe_decoder_delete_(void *decoder)
646 {
647         if(decoder) {
648                 http_decoder_safe_decoder_finish_(decoder);
649                 FLAC__stream_decoder_delete( (FLAC__StreamDecoder *) decoder);
650         }
651 }
652
653 static FLAC__bool http_decoder_is_eof(void *decoder)
654 {
655         return FLAC__stream_decoder_get_state((FLAC__StreamDecoder *) decoder) == FLAC__STREAM_DECODER_END_OF_STREAM;
656 }
657
658 static const decoder_funcs_t HTTP_DECODER_FUNCTIONS = {
659         false,
660         (void* (*) (void)) FLAC__stream_decoder_new,
661         http_decoder_set_md5_checking,
662         (FLAC__bool (*) (void *, const char*)) http_decoder_set_url,
663         (FLAC__bool (*) (void *)) FLAC__stream_decoder_set_metadata_ignore_all,
664         (FLAC__bool (*) (void *, FLAC__MetadataType)) FLAC__stream_decoder_set_metadata_respond,
665         (FLAC__bool (*) (void *, WriteCallback)) FLAC__stream_decoder_set_write_callback,
666         (FLAC__bool (*) (void *, MetadataCallback)) FLAC__stream_decoder_set_metadata_callback,
667         (FLAC__bool (*) (void *, ErrorCallback)) FLAC__stream_decoder_set_error_callback,
668         (FLAC__bool (*) (void *, void *)) FLAC__stream_decoder_set_client_data,
669         (FLAC__bool (*) (void *)) http_decoder_init,
670         (void (*) (void *)) http_decoder_safe_decoder_finish_,
671         (void (*) (void *)) http_decoder_safe_decoder_delete_,
672         (FLAC__bool (*) (void *)) FLAC__stream_decoder_process_until_end_of_metadata,
673         (FLAC__bool (*) (void *)) FLAC__stream_decoder_process_single,
674         http_decoder_is_eof
675 };
676
677 static decoder_funcs_t const *decoder_func_table_;
678
679 static void init_decoder_func_tables()
680 {
681         DECODER_FUNCS [DECODER_FILE] = & FILE_DECODER_FUNCTIONS;
682         DECODER_FUNCS [DECODER_HTTP] = & HTTP_DECODER_FUNCTIONS;
683 }
684
685 static decoder_t source_to_decoder_type (const char *source)
686 {
687         return strncasecmp(source, "http://", 7) ? DECODER_FILE : DECODER_HTTP;
688 }
689
690 static void change_decoder_if_needed (decoder_t new_decoder_type, void **decoderp, decoder_funcs_t const ** fntabp)
691 {
692         const decoder_funcs_t *new_fn_table = DECODER_FUNCS [new_decoder_type];
693         if (*fntabp != new_fn_table) {
694                 (*fntabp)->safe_decoder_delete(*decoderp);
695                 *fntabp = new_fn_table;
696                 *decoderp = new_fn_table -> new_decoder();
697         }
698 }
699
700 FLAC__bool safe_decoder_init_(const char *filename, void **decoderp, decoder_funcs_t const ** fntabp)
701 {
702         if(decoderp == 0 || *decoderp == 0)
703                 return false;
704
705         (*fntabp)->safe_decoder_finish(*decoderp);
706
707         change_decoder_if_needed(source_to_decoder_type(filename), decoderp, fntabp);
708
709         {
710                 decoder_funcs_t const *fntab = *fntabp;
711                 void *decoder = *decoderp;
712
713                 decoder = *decoderp;
714                 fntab = *fntabp;
715
716                 fntab -> set_md5_checking(decoder, false);
717                 fntab -> set_source(decoder, filename);
718                 fntab -> set_metadata_ignore_all(decoder);
719                 fntab -> set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO);
720                 fntab -> set_metadata_respond(decoder, FLAC__METADATA_TYPE_VORBIS_COMMENT);
721                 fntab -> set_write_callback(decoder, write_callback_);
722                 fntab -> set_metadata_callback(decoder, metadata_callback_);
723                 fntab -> set_error_callback(decoder, error_callback_);
724                 fntab -> set_client_data(decoder, &file_info_);
725                 if(!fntab -> decoder_init(decoder))
726                         return false;
727
728                 if(!fntab -> process_until_end_of_metadata(decoder))
729                         return false;
730         }
731
732         return true;
733 }
734
735 FLAC__StreamDecoderWriteStatus write_callback_(const void *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
736 {
737         file_info_struct *file_info = (file_info_struct *)client_data;
738         const unsigned channels = file_info->channels, wide_samples = frame->header.blocksize;
739         const unsigned bits_per_sample = file_info->bits_per_sample;
740         FLAC__byte *sample_buffer_start;
741
742         (void)decoder;
743
744         if(file_info->abort_flag)
745                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
746
747         if((sample_buffer_last_ + wide_samples) > (SAMPLE_BUFFER_SIZE / (channels * file_info->sample_format_bytes_per_sample))) {
748                 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);
749                 sample_buffer_last_ -= sample_buffer_first_;
750                 sample_buffer_first_ = 0;
751         }
752         sample_buffer_start = sample_buffer_ + sample_buffer_last_ * channels * file_info->sample_format_bytes_per_sample;
753         if(file_info->has_replaygain && flac_cfg.output.replaygain.enable) {
754                 FLAC__replaygain_synthesis__apply_gain(
755                                 sample_buffer_start,
756                                 !is_big_endian_host_,
757                                 file_info->sample_format_bytes_per_sample == 1, /* unsigned_data_out */
758                                 buffer,
759                                 wide_samples,
760                                 channels,
761                                 bits_per_sample,
762                                 file_info->sample_format_bytes_per_sample * 8,
763                                 file_info->replay_scale,
764                                 flac_cfg.output.replaygain.hard_limit,
765                                 flac_cfg.output.resolution.replaygain.dither,
766                                 &file_info->dither_context
767                 );
768         }
769         else if(is_big_endian_host_) {
770                 FLAC__plugin_common__pack_pcm_signed_big_endian(
771                         sample_buffer_start,
772                         buffer,
773                         wide_samples,
774                         channels,
775                         bits_per_sample,
776                         file_info->sample_format_bytes_per_sample * 8
777                 );
778         }
779         else {
780                 FLAC__plugin_common__pack_pcm_signed_little_endian(
781                         sample_buffer_start,
782                         buffer,
783                         wide_samples,
784                         channels,
785                         bits_per_sample,
786                         file_info->sample_format_bytes_per_sample * 8
787                 );
788         }
789
790         sample_buffer_last_ += wide_samples;
791
792         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
793 }
794
795 void metadata_callback_(const void *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
796 {
797         file_info_struct *file_info = (file_info_struct *)client_data;
798         (void)decoder;
799         if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
800                 file_info->total_samples = metadata->data.stream_info.total_samples;
801                 file_info->bits_per_sample = metadata->data.stream_info.bits_per_sample;
802                 file_info->channels = metadata->data.stream_info.channels;
803                 file_info->sample_rate = metadata->data.stream_info.sample_rate;
804                 {
805                         FLAC__uint64 l = (FLAC__uint64)((double)file_info->total_samples / (double)file_info->sample_rate * 1000.0 + 0.5);
806                         if (l > INT_MAX)
807                                 l = INT_MAX;
808                         file_info->length_in_msec = (int)l;
809                 }
810         }
811         else if(metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
812                 double gain, peak;
813                 if(grabbag__replaygain_load_from_vorbiscomment(metadata, flac_cfg.output.replaygain.album_mode, /*strict=*/false, &gain, &peak)) {
814                         file_info->has_replaygain = true;
815                         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);
816                 }
817         }
818 }
819
820 void error_callback_(const void *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
821 {
822         file_info_struct *file_info = (file_info_struct *)client_data;
823         (void)decoder;
824         if(status != FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC)
825                 file_info->abort_flag = true;
826 }