1 /*
2 * Copyright (C) 2000-2019 the xine project
3 *
4 * This file is part of xine, a free video player.
5 *
6 * xine is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * xine is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
19 */
20
21 /*
22 * FLAC File Demuxer by Mike Melanson (melanson@pcisys.net)
23 * For more information on the FLAC file format, visit:
24 * http://flac.sourceforge.net/
25 */
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include <stdio.h>
32 #include <fcntl.h>
33 #include <unistd.h>
34 #include <string.h>
35 #include <stdlib.h>
36 #ifdef HAVE_MALLOC_H
37 #include <malloc.h>
38 #endif
39
40 #define LOG_MODULE "demux_flac"
41 #define LOG_VERBOSE
42 /*
43 #define LOG
44 */
45
46 #define USE_FRAME_BUF
47
48 #include <xine/xine_internal.h>
49 #include <xine/xineutils.h>
50 #include <xine/compat.h>
51 #include <xine/demux.h>
52 #include "bswap.h"
53 #include "group_audio.h"
54
55 #include "id3.h"
56 #include "flacutils.h"
57
58 typedef struct {
59 demux_plugin_t demux_plugin;
60
61 xine_stream_t *stream;
62 fifo_buffer_t *audio_fifo;
63 input_plugin_t *input;
64 int status;
65
66 int sample_rate;
67 int bits_per_sample;
68 int channels;
69 int64_t total_samples;
70 off_t data_start;
71 off_t data_size;
72
73 flac_seekpoint_t *seekpoints;
74 int seekpoint_count;
75
76 #ifdef USE_FRAME_BUF
77 uint8_t frame_head_crc_tab[256];
78 uint8_t frame_head[16];
79 uint8_t *frame_buf;
80 uint32_t frame_buf_used;
81 uint32_t frame_buf_size;
82 off_t frame_buf_filepos;
83 struct {
84 off_t filepos;
85 uint32_t rate;
86 uint32_t bits;
87 uint32_t channels;
88 uint32_t vbs;
89 uint32_t hsize;
90 uint32_t bsize;
91 uint32_t num;
92 uint32_t max_size;
93 uint32_t buf_pos;
94 } frame1, frame2;
95 int64_t last_pts;
96 int seek_flag;
97 int read_errs;
98 #endif
99
100 unsigned char streaminfo[sizeof(xine_waveformatex) + FLAC_STREAMINFO_SIZE];
101 } demux_flac_t;
102
103 #ifdef USE_FRAME_BUF
104 static const uint32_t flac_sample_rates[16] = {
105 0, 88200, 176400, 192000,
106 8000, 16000, 22050, 24000,
107 32000, 44100, 48000, 96000,
108 1, 2, 3, 0
109 };
110
111 static const uint32_t flac_blocksizes[16] = {
112 0, 192, 576, 2 * 576,
113 4 * 576, 8 * 576, 1, 2,
114 256, 2 * 256, 4 * 256, 8 * 256,
115 16 * 256, 32 * 256, 64 * 256, 128 * 256
116 };
117
118 static const uint8_t flac_sample_sizes[8] = {
119 0, 8, 12, 0,
120 16, 20, 24, 0
121 };
122
123 static const uint8_t flac_channels[16] = {
124 1, /* mono */
125 2, /* stereo */
126 3, /* surround */
127 4, /* quadrophonic */
128 5, /* 5.0 */
129 6, /* 5.1 */
130 7, /* 6.1 */
131 8, /* 7.1 */
132 2, /* left + side */
133 2, /* right + side */
134 2, /* mid + side */
135 0,
136 0,
137 0,
138 0,
139 0
140 };
141
flac_init_frame_head(demux_flac_t * flac)142 static void flac_init_frame_head (demux_flac_t *flac) {
143 uint32_t i, j, v;
144 for (i = 0; i < 256; i++) {
145 v = i << 24;
146 for (j = 0; j < 8; j++)
147 v = (v << 1) ^ (0x07000000 & (((int32_t)v) >> 31));
148 flac->frame_head_crc_tab[i] = v >> 24;
149 }
150 }
151
flac_reset_head(demux_flac_t * flac)152 static void flac_reset_head (demux_flac_t *flac) {
153 flac->frame1.buf_pos = 0;
154 flac->frame2.buf_pos = 0;
155 flac->frame1.hsize = 0;
156 flac->frame2.hsize = 0;
157 flac->frame_buf_used = 0;
158 }
159
flac_test_frame_head(demux_flac_t * flac,uint32_t len)160 static uint32_t flac_test_frame_head (demux_flac_t *flac, uint32_t len) {
161 uint8_t *p = flac->frame_head;
162 uint32_t v = 0;
163 while (len--)
164 v = (v >> 8) ^ flac->frame_head_crc_tab[*p++ ^ (v & 0xff)];
165 return v;
166 }
167
flac_parse_frame_head(demux_flac_t * flac)168 static int flac_parse_frame_head (demux_flac_t *flac) {
169 const uint8_t *p = flac->frame_head;
170 uint32_t v;
171 /* sync word */
172 if (p[0] != 0xff)
173 return 1;
174 if ((p[1] & 0xfe) != 0xf8)
175 return 1;
176 /* reserved */
177 if (flac->frame_head[3] & 1)
178 return 2;
179 /* variable block size */
180 flac->frame2.vbs = flac->frame_head[1] & 0x01;
181 /* channels */
182 v = flac_channels[flac->frame_head[3] >> 4];
183 if (v == 0)
184 return 2;
185 flac->frame2.channels = v;
186 /* bits */
187 v = flac_sample_sizes[(flac->frame_head[3] >> 1) & 7];
188 if (v == 0)
189 return 2;
190 flac->frame2.bits = v;
191 /* frame num (fixed block size) or sample num (utf8) */
192 p += 4;
193 v = _X_BE_32 (p);
194 if ((v & 0x80000000) == 0) {
195 flac->frame2.num = v >> 24;
196 p += 1;
197 } else if ((v & 0xe0c00000) == 0xc0800000) {
198 flac->frame2.num = ((v & 0x1f000000) >> 18)
199 | ((v & 0x003f0000) >> 16);
200 p += 2;
201 } else if ((v & 0xf0c0c000) == 0xe0808000) {
202 flac->frame2.num = ((v & 0x0f000000) >> 12)
203 | ((v & 0x003f0000) >> 10)
204 | ((v & 0x00003f00) >> 8);
205 p += 3;
206 } else if ((v & 0xf8c0c0c0) == 0xf0808080) {
207 flac->frame2.num = ((v & 0x07000000) >> 6)
208 | ((v & 0x003f0000) >> 4)
209 | ((v & 0x00003f00) >> 2)
210 | (v & 0x0000003f);
211 p += 4;
212 } else if ((v & 0xfcc0c0c0) == 0xf8808080) {
213 flac->frame2.num = (v & 0x03000000)
214 | ((v & 0x003f0000) << 2)
215 | ((v & 0x00003f00) << 4)
216 | ((v & 0x0000003f) << 6)
217 | (p[4] & 0x3f);
218 p += 5;
219 } else if ((v & 0xfec0c0c0) == 0xfc808080) {
220 flac->frame2.num = ((v & 0x01000000) << 6)
221 | ((v & 0x003f0000) << 8)
222 | ((v & 0x00003f00) << 10)
223 | ((v & 0x0000003f) << 12)
224 | ((p[4] & 0x3f) << 6)
225 | (p[5] & 0x3f);
226 p += 6;
227 } else {
228 return 2;
229 }
230 /* block size */
231 v = flac_blocksizes[flac->frame_head[2] >> 4];
232 if (v < 4) {
233 switch (v) {
234 case 1:
235 v = *p++ + 1;
236 break;
237 case 2:
238 v = _X_BE_16 (p) + 1; p += 2;
239 break;
240 default:
241 return 2;
242 }
243 }
244 flac->frame2.bsize = v;
245 /* sample rate */
246 v = flac_sample_rates[flac->frame_head[2] & 0x0f];
247 if (v < 4) {
248 switch (v) {
249 case 1:
250 v = *p++ * 1000;
251 break;
252 case 2:
253 v = _X_BE_16 (p); p += 2;
254 break;
255 case 3:
256 v = _X_BE_16 (p) * 10; p += 2;
257 break;
258 default:
259 return 2;
260 }
261 }
262 flac->frame2.rate = v;
263 /* crc test */
264 p++;
265 flac->frame2.hsize = p - flac->frame_head;
266 if (flac_test_frame_head (flac, flac->frame2.hsize) != 0)
267 return 2;
268 /* flac shall make things smaller than the uncompressed size. */
269 /* frame head + frame crc + channel heads */
270 v = 18 + flac->frame2.channels * (((flac->frame2.bits + 7) >> 3) + 1);
271 /* uncompressed samples */
272 if (flac->frame2.channels == 2)
273 v += ((2 * flac->frame2.bits + 1) * flac->frame2.bsize + 7) >> 3;
274 else
275 v += (flac->frame2.channels * flac->frame2.bits * flac->frame2.bsize + 7) >> 3;
276 flac->frame2.max_size = v;
277 return 0;
278 }
279
flac_get_frame(demux_flac_t * flac)280 static int flac_get_frame (demux_flac_t *flac) {
281 int r = -1;
282 uint32_t v;
283 uint8_t *p, *e;
284
285 flac->frame1 = flac->frame2;
286 p = flac->frame_buf + flac->frame2.buf_pos + flac->frame2.hsize;
287 e = flac->frame_buf + flac->frame_buf_used;
288 memcpy (e, "\xff\xf8\x00\x00", 4);
289 v = _X_BE_32 (p); p += 4;
290
291 while (1) {
292 uint32_t l;
293 int32_t s;
294 while ((v & 0xfffe0001) != 0xfff80000)
295 v = (v << 8) | *p++;
296 if (p + sizeof (flac->frame_head) - 4 <= e) {
297 flac->frame2.buf_pos = p - 4 - flac->frame_buf;
298 flac->frame2.filepos = flac->frame_buf_filepos + flac->frame2.buf_pos;
299 memcpy (flac->frame_head, flac->frame_buf + flac->frame2.buf_pos, sizeof (flac->frame_head));
300 r = flac_parse_frame_head (flac);
301 if (r == 0)
302 break;
303 v = (v << 8) | *p++;
304 continue;
305 }
306 if (flac->frame1.bits == 0) {
307 p = flac->frame_buf + 4;
308 flac->frame1.buf_pos = 0;
309 flac->frame_buf_used = 0;
310 } else if (flac->frame1.buf_pos) {
311 l = flac->frame_buf_used - flac->frame1.buf_pos;
312 if (l) {
313 if (l <= flac->frame1.buf_pos)
314 memcpy (flac->frame_buf, flac->frame_buf + flac->frame1.buf_pos, l);
315 else
316 memmove (flac->frame_buf, flac->frame_buf + flac->frame1.buf_pos, l);
317 }
318 p -= flac->frame1.buf_pos;
319 flac->frame1.buf_pos = 0;
320 flac->frame_buf_used = l;
321 }
322 flac->frame2.buf_pos = p - 4 - flac->frame_buf;
323 flac->frame2.hsize = 0;
324 l = flac->frame_buf_size - flac->frame_buf_used;
325 if (!l)
326 break;
327 flac->frame_buf_filepos = flac->input->get_current_pos (flac->input) - flac->frame_buf_used;
328 s = flac->input->read (flac->input, flac->frame_buf + flac->frame_buf_used, l);
329 if (s <= 0)
330 break;
331 flac->frame_buf_used += s;
332 e = flac->frame_buf + flac->frame_buf_used;
333 memcpy (e, "\xff\xf8\x00\x00", 4);
334 v = _X_BE_32 (p - 4);
335 }
336
337 /* enlarge buf? */
338 if ((r == 0) && (flac->frame2.max_size > flac->frame_buf_size)) {
339 uint32_t need = 3 * flac->frame2.max_size / 2;
340 uint8_t *n = realloc (flac->frame_buf, need + 16);
341 if (n) {
342 flac->frame_buf = n;
343 flac->frame_buf_size = need;
344 xprintf (flac->stream->xine, XINE_VERBOSITY_DEBUG,
345 "demux_flac: frame buffer enlarged to %u bytes.\n", (unsigned int)need);
346 }
347 }
348
349 return flac->frame2.buf_pos - flac->frame1.buf_pos;
350 }
351 #endif
352
353 /* Open a flac file
354 * This function is called from the _open() function of this demuxer.
355 * It returns 1 if flac file was opened successfully. */
open_flac_file(demux_flac_t * flac)356 static int open_flac_file(demux_flac_t *flac) {
357
358 uint32_t signature;
359 unsigned char preamble[10];
360 unsigned int block_length;
361 unsigned char buffer[FLAC_SEEKPOINT_SIZE];
362 unsigned char *streaminfo = flac->streaminfo + sizeof(xine_waveformatex);
363 int i;
364
365 /* fetch the file signature, 4 bytes will read both the fLaC
366 * signature and the */
367 if (_x_demux_read_header(flac->input, &signature, 4) != 4)
368 return 0;
369
370 flac->input->seek(flac->input, 4, SEEK_SET);
371
372 /* Unfortunately some FLAC files have an ID3 flag prefixed on them
373 * before the actual FLAC headers... these are barely legal, but
374 * users use them and want them working, so check and skip the ID3
375 * tag if present.
376 */
377 if ( id3v2_istag(signature) ) {
378 id3v2_parse_tag(flac->input, flac->stream, signature);
379
380 if ( flac->input->read(flac->input, &signature, 4) != 4 )
381 return 0;
382 }
383
384 /* validate signature */
385 if ( signature != ME_FOURCC('f', 'L', 'a', 'C') )
386 return 0;
387
388 /* loop through the metadata blocks; use a do-while construct since there
389 * will always be 1 metadata block */
390 do {
391
392 if (flac->input->read(flac->input, preamble, FLAC_SIGNATURE_SIZE) !=
393 FLAC_SIGNATURE_SIZE)
394 return 0;
395
396 block_length = (preamble[1] << 16) |
397 (preamble[2] << 8) |
398 (preamble[3] << 0);
399
400 switch (preamble[0] & 0x7F) {
401
402 /* STREAMINFO */
403 case 0:
404 lprintf ("STREAMINFO metadata\n");
405 if (block_length != FLAC_STREAMINFO_SIZE) {
406 lprintf ("expected STREAMINFO chunk of %d bytes\n",
407 FLAC_STREAMINFO_SIZE);
408 return 0;
409 }
410 if (flac->input->read(flac->input,
411 flac->streaminfo + sizeof(xine_waveformatex),
412 FLAC_STREAMINFO_SIZE) != FLAC_STREAMINFO_SIZE)
413 return 0;
414 flac->sample_rate = _X_BE_32(&streaminfo[10]);
415 flac->channels = ((flac->sample_rate >> 9) & 0x07) + 1;
416 flac->bits_per_sample = ((flac->sample_rate >> 4) & 0x1F) + 1;
417 flac->sample_rate >>= 12;
418 flac->total_samples = _X_BE_64(&streaminfo[10]) & UINT64_C(0x0FFFFFFFFF); /* 36 bits */
419 lprintf ("%d Hz, %d bits, %d channels, %"PRId64" total samples\n",
420 flac->sample_rate, flac->bits_per_sample,
421 flac->channels, flac->total_samples);
422 break;
423
424 /* PADDING */
425 case 1:
426 lprintf ("PADDING metadata\n");
427 flac->input->seek(flac->input, block_length, SEEK_CUR);
428 break;
429
430 /* APPLICATION */
431 case 2:
432 lprintf ("APPLICATION metadata\n");
433 flac->input->seek(flac->input, block_length, SEEK_CUR);
434 break;
435
436 /* SEEKTABLE */
437 case 3:
438 lprintf ("SEEKTABLE metadata, %d bytes\n", block_length);
439 if (!flac->sample_rate)
440 break;
441 flac->seekpoint_count = block_length / FLAC_SEEKPOINT_SIZE;
442 if (!flac->seekpoint_count)
443 break;
444 flac->seekpoints = calloc(flac->seekpoint_count, sizeof(flac_seekpoint_t));
445 if (!flac->seekpoints)
446 return 0;
447 for (i = 0; i < flac->seekpoint_count; i++) {
448 if (flac->input->read(flac->input, buffer, FLAC_SEEKPOINT_SIZE) != FLAC_SEEKPOINT_SIZE)
449 return 0;
450 flac->seekpoints[i].sample_number = _X_BE_64(&buffer[0]);
451 lprintf (" %d: sample %"PRId64", ", i, flac->seekpoints[i].sample_number);
452 flac->seekpoints[i].offset = _X_BE_64(&buffer[8]);
453 flac->seekpoints[i].size = _X_BE_16(&buffer[16]);
454 lprintf ("@ 0x%"PRIX64", size = %d bytes, ",
455 flac->seekpoints[i].offset, flac->seekpoints[i].size);
456 flac->seekpoints[i].pts = flac->seekpoints[i].sample_number;
457 flac->seekpoints[i].pts *= 90000;
458 flac->seekpoints[i].pts /= flac->sample_rate;
459 lprintf ("pts = %"PRId64"\n", flac->seekpoints[i].pts);
460 }
461 break;
462
463 /* VORBIS_COMMENT
464 *
465 * For a description of the format please have a look at
466 * http://www.xiph.org/vorbis/doc/v-comment.html */
467 case 4:
468 lprintf ("VORBIS_COMMENT metadata\n");
469 {
470 char *comments;
471 uint32_t length, user_comment_list_length, cn;
472 char *comment;
473 char c;
474
475 if (block_length < 8)
476 break;
477
478 comments = malloc(block_length + 1); /* last byte for NUL termination */
479 if (!comments)
480 break;
481
482 if (flac->input->read(flac->input, comments, block_length) == block_length) {
483 char *ptr = comments;
484 int tracknumber = -1;
485 int tracktotal = -1;
486
487 length = _X_LE_32(ptr);
488 ptr += 4 + length;
489 if (length > block_length - 8) {
490 free(comments);
491 return 0; /* bad length or too little left in the buffer */
492 }
493
494 user_comment_list_length = _X_LE_32(ptr);
495 ptr += 4;
496
497 cn = 0;
498 for (; cn < user_comment_list_length; cn++) {
499 if (ptr > comments + block_length - 4) {
500 free(comments);
501 return 0; /* too little left in the buffer */
502 }
503
504 length = _X_LE_32(ptr);
505 ptr += 4;
506 if (length >= block_length || ptr + length > comments + block_length) {
507 free(comments);
508 return 0; /* bad length */
509 }
510
511 comment = (char*) ptr;
512 c = comment[length];
513 comment[length] = 0; /* NUL termination */
514
515 lprintf ("comment[%02d] = %s\n", cn, comment);
516
517 if ((strncasecmp ("TITLE=", comment, 6) == 0)
518 && (length - 6 > 0)) {
519 _x_meta_info_set_utf8 (flac->stream, XINE_META_INFO_TITLE, comment + 6);
520 } else if ((strncasecmp ("ARTIST=", comment, 7) == 0)
521 && (length - 7 > 0)) {
522 _x_meta_info_set_utf8 (flac->stream, XINE_META_INFO_ARTIST, comment + 7);
523 } else if ((strncasecmp ("COMPOSER=", comment, 9) == 0)
524 && (length - 9 > 0)) {
525 _x_meta_info_set_utf8 (flac->stream, XINE_META_INFO_COMPOSER, comment + 9);
526 } else if ((strncasecmp ("ALBUM=", comment, 6) == 0)
527 && (length - 6 > 0)) {
528 _x_meta_info_set_utf8 (flac->stream, XINE_META_INFO_ALBUM, comment + 6);
529 } else if ((strncasecmp ("DATE=", comment, 5) == 0)
530 && (length - 5 > 0)) {
531 _x_meta_info_set_utf8 (flac->stream, XINE_META_INFO_YEAR, comment + 5);
532 } else if ((strncasecmp ("GENRE=", comment, 6) == 0)
533 && (length - 6 > 0)) {
534 _x_meta_info_set_utf8 (flac->stream, XINE_META_INFO_GENRE, comment + 6);
535 } else if ((strncasecmp ("Comment=", comment, 8) == 0)
536 && (length - 8 > 0)) {
537 _x_meta_info_set_utf8 (flac->stream, XINE_META_INFO_COMMENT, comment + 8);
538 } else if ((strncasecmp ("TRACKNUMBER=", comment, 12) == 0)
539 && (length - 12 > 0)) {
540 tracknumber = atoi (comment + 12);
541 } else if ((strncasecmp ("TRACKTOTAL=", comment, 11) == 0)
542 && (length - 11 > 0)) {
543 tracktotal = atoi (comment + 11);
544 }
545 comment[length] = c;
546
547 ptr += length;
548 }
549
550 if ((tracknumber > 0) && (tracktotal > 0)) {
551 char tn[24];
552 snprintf (tn, 24, "%02d/%02d", tracknumber, tracktotal);
553 _x_meta_info_set(flac->stream, XINE_META_INFO_TRACK_NUMBER, tn);
554 }
555 else if (tracknumber > 0) {
556 char tn[16];
557 snprintf (tn, 16, "%02d", tracknumber);
558 _x_meta_info_set(flac->stream, XINE_META_INFO_TRACK_NUMBER, tn);
559 }
560 }
561 free(comments);
562 }
563 break;
564
565 /* CUESHEET */
566 case 5:
567 lprintf ("CUESHEET metadata\n");
568 flac->input->seek(flac->input, block_length, SEEK_CUR);
569 break;
570
571 /* 6-127 are presently reserved */
572 default:
573 lprintf ("unknown metadata chunk: %d\n", preamble[0] & 0x7F);
574 flac->input->seek(flac->input, block_length, SEEK_CUR);
575 break;
576
577 }
578
579 } while ((preamble[0] & 0x80) == 0);
580
581 /* do not bail out yet, maybe decoder can handle this
582 if (!flac->sample_rate)
583 return 0;
584 */
585
586 flac->data_start = flac->input->get_current_pos(flac->input);
587 flac->data_size = flac->input->get_length(flac->input) - flac->data_start;
588
589 /* now at the beginning of the audio, adjust the seekpoint offsets */
590 for (i = 0; i < flac->seekpoint_count; i++) {
591 flac->seekpoints[i].offset += flac->data_start;
592 }
593
594 return 1;
595 }
596
demux_flac_send_chunk(demux_plugin_t * this_gen)597 static int demux_flac_send_chunk(demux_plugin_t *this_gen) {
598 demux_flac_t *this = (demux_flac_t *) this_gen;
599 buf_element_t *buf = NULL;
600 #ifdef USE_FRAME_BUF
601 int l;
602 #else
603 int64_t input_time_guess;
604 #endif
605
606 #ifdef USE_FRAME_BUF
607 l = flac_get_frame (this);
608 if (l) {
609 uint32_t flags, normpos = 0;
610 uint8_t *p;
611 int64_t pts;
612 int itime;
613
614 if (this->data_size > 0)
615 normpos = (double)(this->frame1.filepos - this->data_start) * 65535 / this->data_size;
616
617 if (this->frame1.rate) {
618 if (this->frame1.vbs)
619 pts = (double)this->frame1.num * 90000 / this->frame1.rate;
620 else
621 pts = (double)this->frame1.num * this->frame1.bsize * 90000 / this->frame1.rate;
622 itime = pts / 90;
623 } else {
624 pts = 0;
625 itime = 0;
626 }
627
628 if (this->seek_flag) {
629 _x_demux_control_newpts (this->stream, pts, BUF_FLAG_SEEK);
630 this->seek_flag = 0;
631 } else {
632 int64_t diff = pts - this->last_pts;
633 if (diff < 0)
634 diff = -diff;
635 if (diff > 220000)
636 _x_demux_control_newpts (this->stream, pts, 0);
637 }
638 this->last_pts = pts;
639
640 this->read_errs = 3;
641 flags = BUF_FLAG_FRAME_START;
642 p = this->frame_buf + this->frame1.buf_pos;
643 while (l) {
644 buf = this->audio_fifo->buffer_pool_size_alloc (this->audio_fifo, l);
645 buf->type = BUF_AUDIO_FLAC;
646 buf->size = l > buf->max_size ? buf->max_size : l;
647 memcpy (buf->content, p, buf->size);
648 p += buf->size;
649 l -= buf->size;
650 if (!l)
651 flags |= BUF_FLAG_FRAME_END;
652 buf->decoder_flags |= flags;
653 flags &= ~BUF_FLAG_FRAME_START;
654 buf->extra_info->input_normpos = normpos;
655 buf->pts = pts;
656 buf->extra_info->input_time = itime;
657 pts = 0;
658 itime = 0;
659 this->audio_fifo->put (this->audio_fifo, buf);
660 }
661 } else if (!this->seek_flag) {
662 if (--this->read_errs < 0)
663 this->status = DEMUX_FINISHED;
664 }
665 #else
666 /* just send a buffer-sized chunk; let the decoder figure out the
667 * boundaries and let the engine figure out the pts */
668 buf = this->audio_fifo->buffer_pool_alloc (this->audio_fifo);
669 buf->type = BUF_AUDIO_FLAC;
670 if( this->data_size )
671 buf->extra_info->input_normpos = (int) ( (double) (this->input->get_current_pos(this->input) -
672 this->data_start) * 65535 / this->data_size );
673 buf->pts = 0;
674 buf->size = buf->max_size;
675
676 /*
677 * Estimate the input_time field based on file position:
678 *
679 * current_pos input time
680 * ----------- = ----------
681 * total_pos total time
682 *
683 * total time = total samples / sample rate * 1000
684 */
685
686 /* do this one step at a time to make sure all the numbers stay safe */
687 if (this->sample_rate) {
688 input_time_guess = this->total_samples;
689 input_time_guess /= this->sample_rate;
690 input_time_guess *= 1000;
691 input_time_guess *= buf->extra_info->input_normpos;
692 input_time_guess /= 65535;
693 buf->extra_info->input_time = input_time_guess;
694 }
695
696 if (this->input->read(this->input, buf->content, buf->size) !=
697 buf->size) {
698 buf->free_buffer(buf);
699 this->status = DEMUX_FINISHED;
700 return this->status;
701 }
702 buf->decoder_flags |= BUF_FLAG_FRAME_END;
703 this->audio_fifo->put(this->audio_fifo, buf);
704 #endif
705 return this->status;
706 }
707
demux_flac_send_headers(demux_plugin_t * this_gen)708 static void demux_flac_send_headers(demux_plugin_t *this_gen) {
709 demux_flac_t *this = (demux_flac_t *) this_gen;
710 buf_element_t *buf;
711 xine_waveformatex wave;
712 int bits;
713
714 memset(&wave, 0, sizeof(wave));
715
716 this->audio_fifo = this->stream->audio_fifo;
717
718 /* send start buffers */
719 _x_demux_control_start(this->stream);
720
721 if ( ! this->audio_fifo )
722 {
723 this->status = DEMUX_FINISHED;
724 return;
725 }
726
727 /* lie about 24bps */
728 bits = this->bits_per_sample > 16 ? 16 : this->bits_per_sample;
729
730 buf = this->audio_fifo->buffer_pool_alloc (this->audio_fifo);
731 buf->type = BUF_AUDIO_FLAC;
732 buf->decoder_flags = BUF_FLAG_HEADER|BUF_FLAG_STDHEADER|BUF_FLAG_FRAME_END;
733 buf->decoder_info[0] = 0;
734 buf->decoder_info[1] = this->sample_rate;
735 buf->decoder_info[2] = bits;
736 buf->decoder_info[3] = this->channels;
737 /* copy the faux WAV header */
738 buf->size = sizeof(xine_waveformatex) + FLAC_STREAMINFO_SIZE;
739 memcpy(buf->content, this->streaminfo, buf->size);
740 /* forge a WAV header with the proper length */
741 wave.cbSize = FLAC_STREAMINFO_SIZE;
742 memcpy(buf->content, &wave, sizeof(xine_waveformatex));
743 this->audio_fifo->put (this->audio_fifo, buf);
744
745 _x_stream_info_set(this->stream, XINE_STREAM_INFO_HAS_VIDEO, 0);
746 _x_stream_info_set(this->stream, XINE_STREAM_INFO_HAS_AUDIO, 1);
747 _x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_CHANNELS,
748 this->channels);
749 _x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_SAMPLERATE,
750 this->sample_rate);
751 _x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_BITS,
752 bits);
753
754 this->status = DEMUX_OK;
755 }
756
demux_flac_seek(demux_plugin_t * this_gen,off_t start_pos,int start_time,int playing)757 static int demux_flac_seek (demux_plugin_t *this_gen,
758 off_t start_pos, int start_time, int playing) {
759 demux_flac_t *this = (demux_flac_t *) this_gen;
760 int seekpoint_index = 0;
761 int64_t start_pts;
762 #ifndef USE_FRAME_BUF
763 unsigned char buf[4];
764 #endif
765
766 start_pos = (off_t) ( (double) start_pos / 65535 *
767 this->data_size );
768
769 /* if thread is not running, initialize demuxer */
770 if( !playing && !start_pos) {
771
772 /* send new pts */
773 _x_demux_control_newpts(this->stream, 0, 0);
774
775 this->status = DEMUX_OK;
776 } else {
777
778 if (this->seekpoints == NULL && !start_pos) {
779 /* cannot seek if there is no seekpoints */
780 this->status = DEMUX_OK;
781 return this->status;
782 }
783
784 /* Don't use seekpoints if start_pos != 0. This allows smooth seeking */
785 if (start_pos) {
786 /* offset-based seek */
787 this->status = DEMUX_OK;
788 start_pos += this->data_start;
789 this->input->seek(this->input, start_pos, SEEK_SET);
790 #ifdef USE_FRAME_BUF
791 flac_reset_head (this);
792 this->seek_flag = 1;
793 #else
794 while(1){ /* here we try to find something that resembles a frame header */
795
796 if (this->input->read(this->input, buf, 2) != 2){
797 this->status = DEMUX_FINISHED; /* we sought past the end of stream ? */
798 break;
799 }
800
801 if (buf[0] == 0xff && buf[1] == 0xf8)
802 break; /* this might be the frame header... or it may be not. We pass it to the decoder
803 * to decide, but this way we reduce the number of warnings */
804 start_pos +=2;
805 }
806 #endif
807 _x_demux_flush_engine(this->stream);
808 this->input->seek(this->input, start_pos, SEEK_SET);
809 _x_demux_control_newpts(this->stream, 0, BUF_FLAG_SEEK);
810 return this->status;
811
812 } else {
813 #ifdef USE_FRAME_BUF
814 flac_reset_head (this);
815 this->seek_flag = 1;
816 #endif
817 /* do a lazy, linear seek based on the assumption that there are not
818 * that many seek points; time-based seek */
819 start_pts = start_time;
820 start_pts *= 90;
821 if (start_pts < this->seekpoints[0].pts)
822 seekpoint_index = 0;
823 else {
824 for (seekpoint_index = 0; seekpoint_index < this->seekpoint_count - 1;
825 seekpoint_index++) {
826 if (start_pts < this->seekpoints[seekpoint_index + 1].pts) {
827 break;
828 }
829 }
830 }
831 }
832
833 _x_demux_flush_engine(this->stream);
834 this->input->seek(this->input, this->seekpoints[seekpoint_index].offset,
835 SEEK_SET);
836 _x_demux_control_newpts(this->stream,
837 this->seekpoints[seekpoint_index].pts, BUF_FLAG_SEEK);
838 }
839
840 return this->status;
841 }
842
demux_flac_dispose(demux_plugin_t * this_gen)843 static void demux_flac_dispose (demux_plugin_t *this_gen) {
844 demux_flac_t *this = (demux_flac_t *) this_gen;
845
846 free(this->seekpoints);
847 #ifdef USE_FRAME_BUF
848 free (this->frame_buf);
849 #endif
850 free(this);
851 }
852
demux_flac_get_status(demux_plugin_t * this_gen)853 static int demux_flac_get_status (demux_plugin_t *this_gen) {
854 demux_flac_t *this = (demux_flac_t *) this_gen;
855
856 return this->status;
857 }
858
demux_flac_get_stream_length(demux_plugin_t * this_gen)859 static int demux_flac_get_stream_length (demux_plugin_t *this_gen) {
860 demux_flac_t *this = (demux_flac_t *) this_gen;
861 int64_t length = this->total_samples;
862
863 if (!this->sample_rate)
864 return 0;
865
866 length *= 1000;
867 length /= this->sample_rate;
868
869 return length;
870 }
871
demux_flac_get_capabilities(demux_plugin_t * this_gen)872 static uint32_t demux_flac_get_capabilities(demux_plugin_t *this_gen) {
873 (void)this_gen;
874 return DEMUX_CAP_NOCAP;
875 }
876
demux_flac_get_optional_data(demux_plugin_t * this_gen,void * data,int data_type)877 static int demux_flac_get_optional_data(demux_plugin_t *this_gen,
878 void *data, int data_type) {
879 (void)this_gen;
880 (void)data;
881 (void)data_type;
882 return DEMUX_OPTIONAL_UNSUPPORTED;
883 }
884
open_plugin(demux_class_t * class_gen,xine_stream_t * stream,input_plugin_t * input)885 static demux_plugin_t *open_plugin (demux_class_t *class_gen, xine_stream_t *stream,
886 input_plugin_t *input) {
887
888 demux_flac_t *this;
889
890 /* this should change eventually... */
891 if (!INPUT_IS_SEEKABLE(input)) {
892 xprintf(stream->xine, XINE_VERBOSITY_DEBUG, "input not seekable, can not handle!\n");
893 return NULL;
894 }
895
896 this = calloc(1, sizeof(demux_flac_t));
897 if (!this)
898 return NULL;
899 #ifndef HAVE_ZERO_SAFE_MEM
900 # ifdef USE_FRAME_BUF
901 this->frame_buf_filepos = 0;
902 this->frame_buf_used = 0;
903 this->frame2.filepos = 0;
904 this->frame2.rate = 0;
905 this->frame2.bits = 0;
906 this->frame2.channels = 0;
907 this->frame2.vbs = 0;
908 this->frame2.bsize = 0;
909 this->frame2.num = 0;
910 this->frame2.max_size = 0;
911 this->frame2.buf_pos = 0;
912 this->last_pts = 0;
913 this->seek_flag = 0;
914 # endif
915 this->seekpoints = NULL;
916 #endif
917
918 #ifdef USE_FRAME_BUF
919 this->frame_buf_size = 8 << 10;
920 this->frame_buf = malloc (this->frame_buf_size + 16);
921 if (!this->frame_buf) {
922 free (this);
923 return NULL;
924 }
925 flac_init_frame_head (this);
926 this->read_errs = 3;
927 #endif
928
929 this->stream = stream;
930 this->input = input;
931
932 this->demux_plugin.send_headers = demux_flac_send_headers;
933 this->demux_plugin.send_chunk = demux_flac_send_chunk;
934 this->demux_plugin.seek = demux_flac_seek;
935 this->demux_plugin.dispose = demux_flac_dispose;
936 this->demux_plugin.get_status = demux_flac_get_status;
937 this->demux_plugin.get_stream_length = demux_flac_get_stream_length;
938 this->demux_plugin.get_capabilities = demux_flac_get_capabilities;
939 this->demux_plugin.get_optional_data = demux_flac_get_optional_data;
940 this->demux_plugin.demux_class = class_gen;
941
942 this->status = DEMUX_FINISHED;
943
944 switch (stream->content_detection_method) {
945
946 case METHOD_BY_MRL:
947 case METHOD_BY_CONTENT:
948 case METHOD_EXPLICIT:
949
950 if (!open_flac_file(this)) {
951 demux_flac_dispose (&this->demux_plugin);
952 return NULL;
953 }
954
955 break;
956
957 default:
958 #ifdef USE_FRAME_BUF
959 free (this->frame_buf);
960 #endif
961 free (this);
962 return NULL;
963 }
964
965 return &this->demux_plugin;
966 }
967
demux_flac_init_plugin(xine_t * xine,const void * data)968 void *demux_flac_init_plugin (xine_t *xine, const void *data) {
969
970 (void)xine;
971 (void)data;
972
973 static const demux_class_t demux_flac_class = {
974 .open_plugin = open_plugin,
975 .description = N_("Free Lossless Audio Codec (flac) demux plugin"),
976 .identifier = "FLAC",
977 .mimetypes =
978 "audio/x-flac: flac: FLAC Audio;"
979 "audio/flac: flac: FLAC Audio;",
980 .extensions = "flac",
981 .dispose = NULL,
982 };
983
984 return (void *)&demux_flac_class;
985 }
986
987
988