-
Notifications
You must be signed in to change notification settings - Fork 4
/
aq.c
790 lines (619 loc) · 19.5 KB
/
aq.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
/*C
(c) 2005 bl0rg.net
**/
#include "conf.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#ifdef DMALLOC
#include <dmalloc.h>
#endif
#ifdef DEBUG
#include <stdio.h>
#endif
#include <stdio.h>
#include "aq.h"
static void aq_discard_top_frame(aq_t *q);
static void aq_discard_top_adu(aq_t *q);
static void aq_enqueue_frame(aq_t *q, mp3_frame_t *frame);
static void aq_enqueue_adu(aq_t *q, adu_t *adu);
static void aq_make_adu(aq_t *q);
static void aq_insert_dummy_adu(aq_t *q, unsigned int backptr);
static void aq_insert_dummy_adus(aq_t *q);
static int aq_need_adu(aq_t *q);
static void aq_make_frame(aq_t *q);
/*S
General ADU queue functions
**/
/*M
\emph{Initialize an ADU queue structure.}
**/
void aq_init(aq_t *q) {
assert(q != NULL);
dlist_init(&q->frames);
dlist_init(&q->adus);
q->size = 0;
}
/*M
\emph{Destroy an ADU queue structure.}
**/
void aq_destroy(aq_t *q) {
assert(q != NULL);
dlist_destroy(&q->frames, free);
dlist_destroy(&q->adus, free);
}
/*M
\emph{Enqueue a new frame into the ADU queue.}
\verb|malloc| a new MP3 frame structure and initialize it by copying
the content of \verb|frame|. Append the new MP3 frame structure to
the frames linked list of the ADU queue.
Add the size of \verb|frame|'s audio data
($\verb|frame size| - \verb|sideinfo size| - \verb|header size|$)
to the total queue size.
**/
static void aq_enqueue_frame(aq_t *q, mp3_frame_t *frame) {
assert(q != NULL);
assert(frame != NULL);
mp3_frame_t *tmp_frame = malloc(sizeof(mp3_frame_t));
assert(tmp_frame != NULL);
memcpy(tmp_frame, frame, sizeof(mp3_frame_t));
dlist_t *dlist = dlist_ins_end(&q->frames, tmp_frame);
assert(dlist != NULL);
q->size += tmp_frame->frame_data_size;
}
/*M
\emph{Enqueue a new ADU into the ADU queue.}
**/
static void aq_enqueue_adu(aq_t *q, adu_t *adu) {
assert(q != NULL);
assert(adu != NULL);
adu_t *tmp_adu = malloc(sizeof(adu_t));
assert(tmp_adu != NULL);
memcpy(tmp_adu, adu, sizeof(adu_t));
dlist_t *dlist = dlist_ins_end(&q->adus, tmp_adu);
assert(dlist != NULL);
}
/*M
\emph{Returns the tail MPEG Frame in the queue.}
**/
dlist_t *aq_tail_frame(aq_t *q) {
assert(q != NULL);
return q->frames.end;
}
/*M
\emph{Returns the top MPEG Frame in the queue.}
**/
dlist_t *aq_top_frame(aq_t *q) {
assert(q != NULL);
return q->frames.dlist;
}
/*M
\emph{Returns the tail ADU in the queue.}
**/
dlist_t *aq_tail_adu(aq_t *q) {
assert(q != NULL);
return q->adus.end;
}
/*M
\emph{Returns the top ADU in the queue.}
**/
dlist_t *aq_top_adu(aq_t *q) {
assert(q != NULL);
return q->adus.dlist;
}
/*M
\emph{Pops the front ADU off the queue.}
**/
adu_t *aq_get_adu(aq_t *q) {
return dlist_get_front(&q->adus);
}
/*M
\emph{Pops the front MPEG Frame off the queue.}
Recalculates the total frame data size of the queue.
**/
mp3_frame_t *aq_get_frame(aq_t *q) {
mp3_frame_t *res = dlist_get_front(&q->frames);
if (res)
q->size -= res->frame_data_size;
return res;
}
/*M
\emph{Discard the top MPEG Frame of the queue.}
Recalculates the total frame data size of the queue.
**/
static void aq_discard_top_frame(aq_t *q) {
assert(q->frames.dlist != NULL);
mp3_frame_t *frame = dlist_get(&q->frames, q->frames.dlist);
assert(frame != NULL);
q->size -= frame->frame_data_size;
free(frame);
}
/*M
\emph{Discard the top ADU of the queue.}
**/
static void aq_discard_top_adu(aq_t *q) {
assert(q->adus.dlist != NULL);
adu_t *adu = dlist_get(&q->adus, q->adus.dlist);
assert(adu != NULL);
free(adu);
}
/*M
\emph{Generate an ADU frame out of MPEG frames.}
Enqueue frames into the queue until there is enough data
to generate the ADU for the most recently enqueued frame.
\begin{algorithm} \item[A1:] [Enqueue a new frame]
\verb|size_before| $\leftarrow$ size of the queue before enqueuing, enqueue the
new MP3 frame and add the frame size of the new MP3 frame to the
size of queue. \verb|size_after| $\leftarrow$ size of queue after enqueuing.
\item[A2:] [Check if new frame can be used to generate an ADU]
If the backpointer of the new frame is bigger than \verb|size_before|
then goto {\bf A1}.
\item[A3:] [Check for enough data]
[ If the size of the queue is smaller than the adu size of the new
frame then goto {\bf A1}.
\end{algorithm}
Now an ADU can be generated for the newest frame. The older frames
cannot be transformed to ADUs as data is missing. Get the first
frame in the queue containing ADU data for this frame, and get the
offset into the frame data.
\begin{algorithm}
\item[B1:] [Initialize]
\verb|prev_bytes| $\leftarrow$ backpointer of newest frame.
\item[B2:] [Handle previous frame]
\verb|a| $\leftarrow$ the previous enqueued frame.
Substract the frame size of \verb|a| from \verb|prev_bytes|.
\item[B3:] [Check for enough data]
If \verb|prev_bytes| $\leq$ 0 then \verb|offset| $\leftarrow$ $-$ \verb|prev_bytes|
and stop, else goto {\bf B2}.
\end{algorithm}
Now \verb|a| is the first frame containing data for the ADU, and
\verb|offset| contains the offset into the frame data of \verb|a|.
All olders frames can be discarded.
\begin{algorithm}
\item[C1:] If queue head $\leftarrow$ \verb|a| then stop, else free the queue
head and goto {\bf C1}.
\end{algorithm}
Get the ADU data.
\begin{algorithm}
\item[D1:] [Initialize]
\verb|adu_size| $\leftarrow$ \verb|adu_size| of newest frame.
\item[D2:] [Copy data from frame into ADU]
A:
\verb|data_here| $\leftarrow$ frame size of \verb|a| $-$ \verb|offset|,
\verb|bytes_here| $\leftarrow$ minimum of \verb|data_here| and \verb|adu_size|,
get \verb|bytes_here| bytes of data from current frame at offset
\verb|offset|, substract \verb|bytes_here| from \verb|adu_size|.
\item[D3:] [Get next frame]
\verb|a| $\leftarrow$ next frame in queue, \verb|offset| $\leftarrow$ 0.
If \verb|adu_size| $>$ 0 then goto {\bf D2}, else stop.
\end{algorithm}
**/
static void aq_make_adu(aq_t *q) {
/* get tail frame */
dlist_t *dlist = aq_tail_frame(q);
assert(dlist != NULL);
mp3_frame_t *tail = dlist->data;
assert(tail != NULL);
unsigned int back_ptr = tail->si.main_data_end;
adu_t adu;
memcpy(&adu, tail, sizeof(adu_t));
/* get first frame containing ADU data */
int offset = 0;
while (back_ptr > 0) {
dlist = dlist->prev;
assert(dlist != NULL);
mp3_frame_t *prev_frame = dlist->data;
assert(prev_frame != NULL);
if (prev_frame->frame_data_size < back_ptr) {
back_ptr -= prev_frame->frame_data_size;
} else {
offset = prev_frame->frame_data_size - back_ptr;
break;
}
}
/* discard unneeded top frames */
while (aq_top_frame(q) != dlist)
aq_discard_top_frame(q);
/* fill adu data */
int adu_size = tail->adu_size;
unsigned char *adu_ptr = mp3_frame_data_begin(&adu);
while (adu_size > 0) {
assert(dlist != NULL);
mp3_frame_t *f = dlist->data;
assert(f != NULL);
int data_here = f->frame_data_size - offset;
int bytes_here = adu_size > data_here ? data_here : adu_size;
unsigned char *ptr = mp3_frame_data_begin(f);
assert(((bytes_here + offset) <= (long)f->frame_data_size) ||
"Frame is too short");
memcpy(adu_ptr, ptr + offset, bytes_here);
adu_ptr += bytes_here;
adu_size -= bytes_here;
dlist = dlist->next;
offset = 0;
}
aq_enqueue_adu(q, &adu);
}
/*M
\emph{Add a MPEG frame to the queue and generate an ADU if possible.}
Returns 0 if no ADU could be generated, 1 if an ADU could be
generated.
**/
int aq_add_frame(aq_t *q, mp3_frame_t *frame) {
assert(q != NULL);
assert(frame != NULL);
int back_ptr = frame->si.main_data_end;
int size_before = q->size;
/* discard broken frames */
if (frame->adu_size > (frame->frame_data_size + back_ptr)) {
fprintf(stderr, "Broken frame, skipping...\n");
return 0;
}
assert(frame->adu_size <= (frame->frame_data_size + back_ptr));
aq_enqueue_frame(q, frame);
if ((size_before < back_ptr) ||
(q->size < frame->adu_size))
return 0;
aq_make_adu(q);
return 1;
}
/*M
\emph{Algorithms to convert ADU frames back to MP3 frames.}
Enqueue ADU frames into the queue until there is enough data to
generate the MP3 for the head ADU.
\begin{algorithm}
\item[A1:] [Initialize]
\verb|frame_len| $\leftarrow$ \verb|frame_data_size| of head ADU,
\verb|previous_frame_size| $\leftarrow$ 0,
\verb|adu| $\leftarrow$ head ADU.
\item[A2:]
A:
\verb|data_end| $\leftarrow$ size of \verb|adu| $-$ backpointer of \verb|adu| $+$
\verb|previous_frame_size|.
\item[A3:] [Check for enough data] If \verb|data_end| $>$
\verb|frame_len| then stop, else add the \verb|frame_data_size| of
\verb|adu| to \verb|previous_frame_size|.
\item[A4:] [Check for more ADUs]
If there are no more ADUs in the queue stop (more ADUs are needed), else
\verb|adu| $\leftarrow$ next ADU and goto {\bf A2}.
\end{algorithm}
After an ADU frame is enqueued, check if there are missing ADUs
(the backpointer of the recently enqueued ADU overlaps the data of
the previous ADU).
\begin{algorithm}
\item[B1:] [Initialize]
\verb|adu| $\leftarrow$ tail ADU of the ADU queue.
\item[B2:] [Get previous ADU]
If there is no previous ADU,
\verb|prev_adu_end| $\leftarrow$ 0 and goto {\bf B4}, else \verb|prev_adu| $\leftarrow$ previous
ADU, \verb|prev_adu_end| $\leftarrow$ \verb|frame_data_size| of \verb|prev_adu| $+$
\verb|main_data_end| of \verb|prev_adu| $-$ \verb|adu_size| of
\verb|prev_adu|.
\item[B3:] [Check previous ADU]
If \verb|prev_adu_end| $<$ 0 the frame was not well formed, abort.
\item[B4:] [Check if an ADU is missing]
If the \verb|main_data_end| of \verb|adu| $>$
\verb|prev_adu_end| an ADU is missing, insert a dummy ADU in front of
the tail and goto {\bf B2}.
\end{algorithm}
If there are enough ADUs in the queue, generate the top frame.
\begin{algorithm}
\item[C1:] [Initialize the new MPEG frame]
Copy the header and sideinfo from top adu into mp3 frame,
zero out the frame data.
\item[C2:] [Initialize]
\verb|adu| $\leftarrow$ top adu, offset of data in previous adus $\leftarrow$ 0.
\item [C3:] [Calculate beginning of data]
A:
\verb|data_start| (beginning of data contained in adu relative to beginning
of the mp3 frame data)
$\leftarrow$ offset of data in previous adus $-$ \verb|main_data_end| of \verb|adu|.
\item[C4:] []
If \verb|data_start| $>$ \verb|frame_data_size| of mp3
frame then goto B, else \verb|data_end| (end of data contained in
\verb|adu| relative to begging of the mp3 frame data) $\leftarrow$ maximum of
(\verb|data_start| $+$ size of \verb|adu|) and \verb|frame_data_size|
of mp3 frame.
\item[C5:] [Calculate data offsets]
If \verb|data_start| $<$ 0
then \verb|from_offset| $\leftarrow$ $-$ \verb|data_start|, \verb|to_offset| $\leftarrow$ 0 and
\verb|data_length| $\leftarrow$ \verb|data_end|
else \verb|from_offset| $\leftarrow$ 0, \verb|to_offset| $\leftarrow$ \verb|data_start| and
\verb|data_length| $\leftarrow$ \verb|data_end| $-$ \verb|data_start|.
\item[C6:] [Copy data from ADU to frame]
Copy \verb|data_length|
from \verb|adu| at offset \verb|from_offset| to mp3 frame at offset
\verb|to_offset| and add \verb|frame_data_size| of \verb|adu| to
offset of data in previous adus.
\item[C7:]
If \verb|data_end| $<$ \verb|frame_data_size| of mp3 frame
then \verb|adu| $\leftarrow$ next adu in queue and goto A.
\item[C8:]
B:
Discard top ADU.
\end{algorithm}
**/
/*M
\emph{Insert a dummy ADU.}
Inserts a dummy ADU by copying the frame header and sideinfo
information of tail ADU and zeroing out \verb|main_data_end| and the length
fields.
**/
static void aq_insert_dummy_adu(aq_t *q, unsigned int backptr) {
assert(q != NULL);
#ifdef DEBUG
fprintf(stderr, "XXX insert dummy adu backptr %d\n", backptr);
#endif
dlist_t *dlist = aq_tail_adu(q);
assert(dlist != NULL);
adu_t *tail = dlist->data;
assert(tail != NULL);
adu_t *dummy = malloc(sizeof(adu_t));
assert(dummy != NULL);
/* structure copy */
*dummy = *tail;
/* zero out backpointer and sideinfo length information */
dummy->si.main_data_end = backptr;
unsigned int i, j;
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++) {
dummy->si.channel[i].granule[j].part2_3_length =
dummy->si.channel[i].granule[j].big_values = 0;
dummy->si.channel[i].granule[j].scale_comp = 0;
dummy->si.channel[i].granule[j].tbl_sel[0] =
dummy->si.channel[i].granule[j].tbl_sel[1] =
dummy->si.channel[i].granule[j].tbl_sel[2] = 0;
}
dummy->adu_size = dummy->adu_bitsize = 0;
dlist_t *new = dlist_ins_before(&q->adus, dlist, dummy);
assert(new != NULL);
}
/*M
\emph{Insert dummy ADUs if necessary.}
**/
static void aq_insert_dummy_adus(aq_t *q) {
assert(q != NULL);
dlist_t *dlist = aq_tail_adu(q);
assert(dlist != NULL);
adu_t *tail = dlist->data;
assert(tail != NULL);
unsigned int prev_adu_end = 0;
if (dlist->prev) {
adu_t *prev = dlist->prev->data;
assert(prev != NULL);
prev_adu_end =
prev->frame_data_size + prev->si.main_data_end - prev->adu_size;
assert((prev_adu_end >= 0) || "bad formed ADU frame");
}
/* insert the necessary dummy adus */
int back_ptr = tail->si.main_data_end - prev_adu_end;
for (; back_ptr > 0;
back_ptr -= tail->frame_data_size,
prev_adu_end = 0)
aq_insert_dummy_adu(q, prev_adu_end);
}
//#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define MIN(a, b) minbla(a, b)
long minbla(long a, long b) {
return (a < b ? a : b);
}
/*M
\emph{Make a MP3 frame from ADUs.}
**/
static void aq_make_frame(aq_t *q) {
assert(q != NULL);
dlist_t *dlist = aq_top_adu(q);
assert(dlist != NULL);
adu_t *top = dlist->data;
assert(top != NULL);
#ifdef DEBUG
fprintf(stderr, "top adu size: %d, frame size: %d\n",
top->adu_size, top->frame_data_size);
#endif
mp3_frame_t frame;
memcpy(&frame, top, sizeof(adu_t));
memset(frame.raw, 0, MP3_RAW_SIZE);
unsigned int frames_offset = 0;
int data_end = 0;
do {
assert (dlist != NULL);
adu_t *adu = dlist->data;
assert(adu != NULL);
#ifdef DEBUG
fprintf(stderr, "frames offset %d, backptr %d\n", frames_offset, adu->si.main_data_end);
#endif
int data_start = frames_offset - adu->si.main_data_end;
if (data_start > (long)frame.frame_data_size)
break;
assert(data_start <= (long)frame.frame_data_size);
data_end = MIN(data_start + adu->adu_size, (long)frame.frame_data_size);
#ifdef DEBUG
fprintf(stderr, "data_start: %d, data_end: %d\n", data_start, data_end);
#endif
unsigned int from_offset, to_offset, data_length;
if (data_start < 0) {
from_offset = -data_start;
to_offset = 0;
if (data_end < 0)
data_length = 0;
else
data_length = data_end;
} else {
from_offset = 0;
to_offset = data_start;
data_length = data_end - data_start;
}
if (data_length > 0) {
assert(adu->adu_size >= from_offset + data_length);
#ifdef DEBUG
fprintf(stderr,
"memcpy (size: %d) from [%d:%d] to [%d:%d]\n",
adu->adu_size,
from_offset, from_offset + data_length,
to_offset, to_offset + data_length);
#endif
memcpy(mp3_frame_data_begin(&frame) + to_offset,
mp3_frame_data_begin(adu) + from_offset,
data_length);
}
frames_offset += adu->frame_data_size;
dlist = dlist->next;
} while (data_end < (long)frame.frame_data_size);
aq_discard_top_adu(q);
aq_enqueue_frame(q, &frame);
}
/*M
\emph{Check if there are enough ADUs in the queue to generate a new
MPEG frame.}
**/
static int aq_need_adu(aq_t *q) {
assert(q != NULL);
dlist_t *dlist = aq_top_adu(q);
assert(dlist != NULL);
adu_t *head = dlist->data;
assert(head != NULL);
int frame_len = head->frame_data_size;
#ifdef DEBUG
fprintf(stderr, "aq_need_adu: frame_len: %u\n", frame_len);
#endif
int prev_frames_size = 0;
while (dlist) {
adu_t *adu = dlist->data;
assert(adu != NULL);
int data_end =
prev_frames_size + adu->adu_size - adu->si.main_data_end;
#ifdef DEBUG
fprintf(stderr, "aq_need_adu: data_end: %d, prev_frames_size %u, adu_size %u, main_data_end %u\n",
data_end, prev_frames_size, adu->adu_size, adu->si.main_data_end);
#endif
if (data_end >= frame_len)
return 1;
prev_frames_size += adu->frame_data_size;
dlist = dlist->next;
}
return 0;
}
/*M
\emph{Adds an ADU to the queue and generates a MPEG frame if possible.}
**/
int aq_add_adu(aq_t *q, adu_t *adu) {
assert(q != NULL);
assert(adu != NULL);
aq_enqueue_adu(q, adu);
aq_insert_dummy_adus(q);
if (aq_need_adu(q)) {
aq_make_frame(q);
return 1;
} else {
return 0;
}
}
/*C
**/
#ifdef AQ1_TEST
#include <stdio.h>
int main(int argc, char *argv[]) {
mp3_file_t file;
mp3_frame_t frame;
aq_t qin;
char *f;
if (!(f = *++argv)) {
fprintf(stderr, "Usage: aq1 mp3file\n");
return 1;
}
aq_init(&qin);
if (!mp3_open_read(&file, f)) {
fprintf(stderr, "Could not open mp3 file: %s\n", f);
return 1;
}
while (mp3_next_frame(&file, &frame) > 0) {
if (!aq_add_frame(&qin, &frame)) {
printf("could not generate an ADU\n");
} else {
printf("could generate an ADU\n");
}
fgetc(stdin);
}
file_close(&file);
aq_destroy(&qin);
return 0;
}
#endif /* AQ1_TEST */
#ifdef AQ2_TEST
#include <stdio.h>
unsigned long cksum(unsigned char *buf, int cnt) {
unsigned long res = 0;
int i;
for (i = 0; i < cnt; i++)
res += buf[i];
return res;
}
int main(int argc, char *argv[]) {
char *f[2];
if (!(f[0] = *++argv) || !(f[1] = *++argv)) {
fprintf(stderr, "Usage: mp3-write mp3in mp3out\n");
return 1;
}
file_t in;
if (!file_open_read(&in, f[0])) {
fprintf(stderr, "Could not open mp3 file for read: %s\n", f[0]);
return 1;
}
file_t out;
if (!file_open_write(&out, f[1])) {
fprintf(stderr, "Could not open mp3 file for write: %s\n", f[1]);
file_close(&in);
return 1;
}
aq_t qin, qout;
aq_init(&qin);
aq_init(&qout);
mp3_frame_t frame;
while (mp3_next_frame(&in, &frame) > 0) {
static int cin = 0;
printf("%d in frame_size %ld, backptr %d, adu_size %ld, cksum %ld\n",
cin++,
frame.frame_data_size, frame.si.main_data_end, frame.adu_size,
cksum(frame.raw, frame.frame_size));
if (aq_add_frame(&qin, &frame)) {
adu_t *adu = aq_get_adu(&qin);
assert(adu != NULL);
static int count = 0;
if (count > 2000)
break;
if ((count++ % 25) <= 10) {
free(adu);
continue;
}
if (aq_add_adu(&qout, adu)) {
mp3_frame_t *frame_out = aq_get_frame(&qout);
assert(frame_out != NULL);
static int cout = 0;
memset(frame_out->raw, 0, 4 + frame_out->si_size);
if (!mp3_fill_hdr(frame_out) ||
!mp3_fill_si(frame_out) ||
(mp3_write_frame(&out, frame_out) <= 0)) {
fprintf(stderr, "Could not write frame\n");
file_close(&in);
file_close(&out);
return 1;
}
printf("%d out frame_size %ld, backptr %d, adu_size %ld, cksum %ld\n",
cout++,
frame_out->frame_data_size,
frame_out->si.main_data_end,
frame_out->adu_size,
cksum(frame_out->raw, frame_out->frame_size));
free(frame_out);
}
free(adu);
}
// fgetc(stdin);
}
file_close(&in);
file_close(&out);
aq_destroy(&qin);
aq_destroy(&qout);
return 0;
}
#endif /* AQ2_TEST */