aboutsummaryrefslogtreecommitdiffstats
path: root/libswresample/swresample.c
blob: 5884f8d53309c309aaa10848d5bc2a0aeabf0c46 (plain) (blame)
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
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
/*
 * Copyright (C) 2011-2013 Michael Niedermayer (michaelni@gmx.at)
 *
 * This file is part of libswresample
 *
 * libswresample is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * libswresample is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with libswresample; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/opt.h"
#include "swresample_internal.h"
#include "audioconvert.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/internal.h"

#include <float.h>

#define ALIGN 32

int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map){
    if(!s || s->in_convert) // s needs to be allocated but not initialized
        return AVERROR(EINVAL);
    s->channel_map = channel_map;
    return 0;
}

#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
                                      int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
                                      int64_t  in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
                                      int log_offset, void *log_ctx){
    if(!s) s= swr_alloc();
    if(!s) return NULL;

    s->log_level_offset= log_offset;
    s->log_ctx= log_ctx;

    if (av_opt_set_int(s, "ocl", out_ch_layout,   0) < 0)
        goto fail;

    if (av_opt_set_int(s, "osf", out_sample_fmt,  0) < 0)
        goto fail;

    if (av_opt_set_int(s, "osr", out_sample_rate, 0) < 0)
        goto fail;

    if (av_opt_set_int(s, "icl", in_ch_layout,    0) < 0)
        goto fail;

    if (av_opt_set_int(s, "isf", in_sample_fmt,   0) < 0)
        goto fail;

    if (av_opt_set_int(s, "isr", in_sample_rate,  0) < 0)
        goto fail;

    if (av_opt_set_int(s, "ich", av_get_channel_layout_nb_channels(s-> user_in_ch_layout), 0) < 0)
        goto fail;

    if (av_opt_set_int(s, "och", av_get_channel_layout_nb_channels(s->user_out_ch_layout), 0) < 0)
        goto fail;

    av_opt_set_int(s, "uch", 0, 0);
    return s;
fail:
    av_log(s, AV_LOG_ERROR, "Failed to set option\n");
    swr_free(&s);
    return NULL;
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif

int swr_alloc_set_opts2(struct SwrContext **ps,
                        const AVChannelLayout *out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
                        const AVChannelLayout *in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
                        int log_offset, void *log_ctx) {
    struct SwrContext *s = *ps;
    int ret;

    if (!s) s = swr_alloc();
    if (!s) return AVERROR(ENOMEM);

    *ps = s;

    s->log_level_offset = log_offset;
    s->log_ctx = log_ctx;

    if ((ret = av_opt_set_chlayout(s, "ochl", out_ch_layout, 0)) < 0)
        goto fail;

    if ((ret = av_opt_set_int(s, "osf", out_sample_fmt, 0)) < 0)
        goto fail;

    if ((ret = av_opt_set_int(s, "osr", out_sample_rate, 0)) < 0)
        goto fail;

    if ((ret = av_opt_set_chlayout(s, "ichl", in_ch_layout, 0)) < 0)
        goto fail;

    if ((ret = av_opt_set_int(s, "isf", in_sample_fmt, 0)) < 0)
        goto fail;

    if ((ret = av_opt_set_int(s, "isr", in_sample_rate, 0)) < 0)
        goto fail;

    av_opt_set_int(s, "uch", 0, 0);

#if FF_API_OLD_CHANNEL_LAYOUT
    // Clear old API values so they don't take precedence in swr_init()
    av_opt_set_int(s, "icl", 0, 0);
    av_opt_set_int(s, "ocl", 0, 0);
    av_opt_set_int(s, "ich", 0, 0);
    av_opt_set_int(s, "och", 0, 0);
#endif

    return 0;
fail:
    av_log(s, AV_LOG_ERROR, "Failed to set option\n");
    swr_free(ps);
    return ret;
}

static void set_audiodata_fmt(AudioData *a, enum AVSampleFormat fmt){
    a->fmt   = fmt;
    a->bps   = av_get_bytes_per_sample(fmt);
    a->planar= av_sample_fmt_is_planar(fmt);
    if (a->ch_count == 1)
        a->planar = 1;
}

static void free_temp(AudioData *a){
    av_free(a->data);
    memset(a, 0, sizeof(*a));
}

static void clear_context(SwrContext *s){
    s->in_buffer_index= 0;
    s->in_buffer_count= 0;
    s->resample_in_constraint= 0;
    memset(s->in.ch, 0, sizeof(s->in.ch));
    memset(s->out.ch, 0, sizeof(s->out.ch));
    free_temp(&s->postin);
    free_temp(&s->midbuf);
    free_temp(&s->preout);
    free_temp(&s->in_buffer);
    free_temp(&s->silence);
    free_temp(&s->drop_temp);
    free_temp(&s->dither.noise);
    free_temp(&s->dither.temp);
    av_channel_layout_uninit(&s->in_ch_layout);
    av_channel_layout_uninit(&s->out_ch_layout);
    swri_audio_convert_free(&s-> in_convert);
    swri_audio_convert_free(&s->out_convert);
    swri_audio_convert_free(&s->full_convert);
    swri_rematrix_free(s);

    s->delayed_samples_fixup = 0;
    s->flushed = 0;
}

av_cold void swr_free(SwrContext **ss){
    SwrContext *s= *ss;
    if(s){
        clear_context(s);
        av_channel_layout_uninit(&s->user_in_chlayout);
        av_channel_layout_uninit(&s->user_out_chlayout);

        if (s->resampler)
            s->resampler->free(&s->resample);
    }

    av_freep(ss);
}

av_cold void swr_close(SwrContext *s){
    clear_context(s);
}

av_cold int swr_init(struct SwrContext *s){
    int ret;
    char l1[1024], l2[1024];

    clear_context(s);

    if(s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
        av_log(s, AV_LOG_ERROR, "Requested input sample format %d is invalid\n", s->in_sample_fmt);
        return AVERROR(EINVAL);
    }
    if(s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
        av_log(s, AV_LOG_ERROR, "Requested output sample format %d is invalid\n", s->out_sample_fmt);
        return AVERROR(EINVAL);
    }

    if(s-> in_sample_rate <= 0){
        av_log(s, AV_LOG_ERROR, "Requested input sample rate %d is invalid\n", s->in_sample_rate);
        return AVERROR(EINVAL);
    }
    if(s->out_sample_rate <= 0){
        av_log(s, AV_LOG_ERROR, "Requested output sample rate %d is invalid\n", s->out_sample_rate);
        return AVERROR(EINVAL);
    }
    s->used_ch_count = s->user_used_ch_count;
#if FF_API_OLD_CHANNEL_LAYOUT
    s->out.ch_count  = s-> user_out_ch_count;
    s-> in.ch_count  = s->  user_in_ch_count;

    // if the old/new fields are set inconsistently, prefer the old ones
    if ((s->user_in_ch_count && s->user_in_ch_count != s->user_in_chlayout.nb_channels) ||
        (s->user_in_ch_layout && (s->user_in_chlayout.order != AV_CHANNEL_ORDER_NATIVE ||
                                  s->user_in_chlayout.u.mask != s->user_in_ch_layout))) {
        av_channel_layout_uninit(&s->in_ch_layout);
        if (s->user_in_ch_layout)
            av_channel_layout_from_mask(&s->in_ch_layout, s->user_in_ch_layout);
        else {
            s->in_ch_layout.order       = AV_CHANNEL_ORDER_UNSPEC;
            s->in_ch_layout.nb_channels = s->user_in_ch_count;
        }
    } else if (av_channel_layout_check(&s->user_in_chlayout))
        av_channel_layout_copy(&s->in_ch_layout, &s->user_in_chlayout);

    if ((s->user_out_ch_count && s->user_out_ch_count != s->user_out_chlayout.nb_channels) ||
        (s->user_out_ch_layout && (s->user_out_chlayout.order != AV_CHANNEL_ORDER_NATIVE ||
                                   s->user_out_chlayout.u.mask != s->user_out_ch_layout))) {
        av_channel_layout_uninit(&s->out_ch_layout);
        if (s->user_out_ch_layout)
            av_channel_layout_from_mask(&s->out_ch_layout, s->user_out_ch_layout);
        else {
            s->out_ch_layout.order       = AV_CHANNEL_ORDER_UNSPEC;
            s->out_ch_layout.nb_channels = s->user_out_ch_count;
        }
    } else if (av_channel_layout_check(&s->user_out_chlayout))
        av_channel_layout_copy(&s->out_ch_layout, &s->user_out_chlayout);

    if (!s->out.ch_count && !s->user_out_ch_layout)
        s->out.ch_count  = s->out_ch_layout.nb_channels;
    if (!s-> in.ch_count && !s-> user_in_ch_layout)
        s-> in.ch_count  = s->in_ch_layout.nb_channels;

    if (!(ret = av_channel_layout_check(&s->in_ch_layout)) || s->in_ch_layout.nb_channels > SWR_CH_MAX) {
        if (ret)
            av_channel_layout_describe(&s->in_ch_layout, l1, sizeof(l1));
        av_log(s, AV_LOG_WARNING, "Input channel layout \"%s\" is invalid or unsupported.\n", ret ? l1 : "");
        return AVERROR(EINVAL);
    }

    if (!(ret = av_channel_layout_check(&s->out_ch_layout)) || s->out_ch_layout.nb_channels > SWR_CH_MAX) {
        if (ret)
            av_channel_layout_describe(&s->out_ch_layout, l2, sizeof(l2));
        av_log(s, AV_LOG_WARNING, "Output channel layout \"%s\" is invalid or unsupported.\n", ret ? l2 : "");
        return AVERROR(EINVAL);
    }
#else
    s->out.ch_count  = s-> user_out_chlayout.nb_channels;
    s-> in.ch_count  = s->  user_in_chlayout.nb_channels;

    if (!(ret = av_channel_layout_check(&s->user_in_chlayout)) || s->user_in_chlayout.nb_channels > SWR_CH_MAX) {
        if (ret)
            av_channel_layout_describe(&s->user_in_chlayout, l1, sizeof(l1));
        av_log(s, AV_LOG_WARNING, "Input channel layout \"%s\" is invalid or unsupported.\n", ret ? l1 : "");
        return AVERROR(EINVAL);
    }

    if (!(ret = av_channel_layout_check(&s->user_out_chlayout)) || s->user_out_chlayout.nb_channels > SWR_CH_MAX) {
        if (ret)
            av_channel_layout_describe(&s->user_out_chlayout, l2, sizeof(l2));
        av_log(s, AV_LOG_WARNING, "Output channel layout \"%s\" is invalid or unsupported.\n", ret ? l2 : "");
        return AVERROR(EINVAL);
    }

    ret  = av_channel_layout_copy(&s->in_ch_layout, &s->user_in_chlayout);
    ret |= av_channel_layout_copy(&s->out_ch_layout, &s->user_out_chlayout);
    if (ret < 0)
        return ret;
#endif

    s->int_sample_fmt= s->user_int_sample_fmt;

    s->dither.method = s->user_dither_method;

    switch(s->engine){
#if CONFIG_LIBSOXR
        case SWR_ENGINE_SOXR: s->resampler = &swri_soxr_resampler; break;
#endif
        case SWR_ENGINE_SWR : s->resampler = &swri_resampler; break;
        default:
            av_log(s, AV_LOG_ERROR, "Requested resampling engine is unavailable\n");
            return AVERROR(EINVAL);
    }

    if(!s->used_ch_count)
        s->used_ch_count= s->in.ch_count;

    if (s->used_ch_count && s->in_ch_layout.order != AV_CHANNEL_ORDER_UNSPEC && s->used_ch_count != s->in_ch_layout.nb_channels) {
        av_log(s, AV_LOG_WARNING, "Input channel layout has a different number of channels than the number of used channels, ignoring layout\n");
        av_channel_layout_uninit(&s->in_ch_layout);
    }

    if (s->in_ch_layout.order == AV_CHANNEL_ORDER_UNSPEC)
        av_channel_layout_default(&s->in_ch_layout, s->used_ch_count);
    if (s->out_ch_layout.order == AV_CHANNEL_ORDER_UNSPEC)
        av_channel_layout_default(&s->out_ch_layout, s->out.ch_count);

    s->rematrix = av_channel_layout_compare(&s->out_ch_layout, &s->in_ch_layout) ||
                 s->rematrix_volume!=1.0 ||
                 s->rematrix_custom;

    if(s->int_sample_fmt == AV_SAMPLE_FMT_NONE){
        if(   av_get_bytes_per_sample(s-> in_sample_fmt) <= 2
           && av_get_bytes_per_sample(s->out_sample_fmt) <= 2){
            s->int_sample_fmt= AV_SAMPLE_FMT_S16P;
        }else if(   av_get_bytes_per_sample(s-> in_sample_fmt) <= 2
           && !s->rematrix
           && s->out_sample_rate==s->in_sample_rate
           && !(s->flags & SWR_FLAG_RESAMPLE)){
            s->int_sample_fmt= AV_SAMPLE_FMT_S16P;
        }else if(   av_get_planar_sample_fmt(s-> in_sample_fmt) == AV_SAMPLE_FMT_S32P
                 && av_get_planar_sample_fmt(s->out_sample_fmt) == AV_SAMPLE_FMT_S32P
                 && !s->rematrix
                 && s->out_sample_rate == s->in_sample_rate
                 && !(s->flags & SWR_FLAG_RESAMPLE)
                 && s->engine != SWR_ENGINE_SOXR){
            s->int_sample_fmt= AV_SAMPLE_FMT_S32P;
        }else if(av_get_bytes_per_sample(s->in_sample_fmt) <= 4){
            s->int_sample_fmt= AV_SAMPLE_FMT_FLTP;
        }else{
            s->int_sample_fmt= AV_SAMPLE_FMT_DBLP;
        }
    }
    av_log(s, AV_LOG_DEBUG, "Using %s internally between filters\n", av_get_sample_fmt_name(s->int_sample_fmt));

    if(   s->int_sample_fmt != AV_SAMPLE_FMT_S16P
        &&s->int_sample_fmt != AV_SAMPLE_FMT_S32P
        &&s->int_sample_fmt != AV_SAMPLE_FMT_S64P
        &&s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
        &&s->int_sample_fmt != AV_SAMPLE_FMT_DBLP){
        av_log(s, AV_LOG_ERROR, "Requested sample format %s is not supported internally, s16p/s32p/s64p/fltp/dblp are supported\n", av_get_sample_fmt_name(s->int_sample_fmt));
        return AVERROR(EINVAL);
    }

    set_audiodata_fmt(&s-> in, s-> in_sample_fmt);
    set_audiodata_fmt(&s->out, s->out_sample_fmt);

    if (s->firstpts_in_samples != AV_NOPTS_VALUE) {
        if (!s->async && s->min_compensation >= FLT_MAX/2)
            s->async = 1;
        s->firstpts =
        s->outpts   = s->firstpts_in_samples * s->out_sample_rate;
    } else
        s->firstpts = AV_NOPTS_VALUE;

    if (s->async) {
        if (s->min_compensation >= FLT_MAX/2)
            s->min_compensation = 0.001;
        if (s->async > 1.0001) {
            s->max_soft_compensation = s->async / (double) s->in_sample_rate;
        }
    }

    if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
        s->resample = s->resampler->init(s->resample, s->out_sample_rate, s->in_sample_rate, s->filter_size, s->phase_shift, s->linear_interp, s->cutoff, s->int_sample_fmt, s->filter_type, s->kaiser_beta, s->precision, s->cheby, s->exact_rational);
        if (!s->resample) {
            av_log(s, AV_LOG_ERROR, "Failed to initialize resampler\n");
            return AVERROR(ENOMEM);
        }
    }else
        s->resampler->free(&s->resample);
    if(    s->int_sample_fmt != AV_SAMPLE_FMT_S16P
        && s->int_sample_fmt != AV_SAMPLE_FMT_S32P
        && s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
        && s->int_sample_fmt != AV_SAMPLE_FMT_DBLP
        && s->resample){
        av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16p/s32p/fltp/dblp\n");
        ret = AVERROR(EINVAL);
        goto fail;
    }

#define RSC 1 //FIXME finetune
    if(!s-> in.ch_count)
        s-> in.ch_count = s->in_ch_layout.nb_channels;
    if(!s->used_ch_count)
        s->used_ch_count= s->in.ch_count;
    if(!s->out.ch_count)
        s->out.ch_count = s->out_ch_layout.nb_channels;

    if(!s-> in.ch_count){
        av_assert0(s->in_ch_layout.order == AV_CHANNEL_ORDER_UNSPEC);
        av_log(s, AV_LOG_ERROR, "Input channel count and layout are unset\n");
        ret = AVERROR(EINVAL);
        goto fail;
    }

    av_channel_layout_describe(&s->out_ch_layout, l2, sizeof(l2));
#if FF_API_OLD_CHANNEL_LAYOUT
    if (s->out_ch_layout.order != AV_CHANNEL_ORDER_UNSPEC && s->out.ch_count != s->out_ch_layout.nb_channels) {
        av_log(s, AV_LOG_ERROR, "Output channel layout %s mismatches specified channel count %d\n", l2, s->out.ch_count);
        ret = AVERROR(EINVAL);
        goto fail;
    }
#endif
    av_channel_layout_describe(&s->in_ch_layout, l1, sizeof(l1));
    if (s->in_ch_layout.order != AV_CHANNEL_ORDER_UNSPEC && s->used_ch_count != s->in_ch_layout.nb_channels) {
        av_log(s, AV_LOG_ERROR, "Input channel layout %s mismatches specified channel count %d\n", l1, s->used_ch_count);
        ret = AVERROR(EINVAL);
        goto fail;
    }

    if ((   s->out_ch_layout.order == AV_CHANNEL_ORDER_UNSPEC
         || s-> in_ch_layout.order == AV_CHANNEL_ORDER_UNSPEC) && s->used_ch_count != s->out.ch_count && !s->rematrix_custom) {
        av_log(s, AV_LOG_ERROR, "Rematrix is needed between %s and %s "
               "but there is not enough information to do it\n", l1, l2);
        ret = AVERROR(EINVAL);
        goto fail;
    }

av_assert0(s->used_ch_count);
av_assert0(s->out.ch_count);
    s->resample_first= RSC*s->out.ch_count/s->used_ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;

    s->in_buffer= s->in;
    s->silence  = s->in;
    s->drop_temp= s->out;

    if ((ret = swri_dither_init(s, s->out_sample_fmt, s->int_sample_fmt)) < 0)
        goto fail;

    if(!s->resample && !s->rematrix && !s->channel_map && !s->dither.method){
        s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt,
                                                   s-> in_sample_fmt, s-> in.ch_count, NULL, 0);
        return 0;
    }

    s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt,
                                             s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0);
    s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt,
                                             s->int_sample_fmt, s->out.ch_count, NULL, 0);

    if (!s->in_convert || !s->out_convert) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    s->postin= s->in;
    s->preout= s->out;
    s->midbuf= s->in;

    if(s->channel_map){
        s->postin.ch_count=
        s->midbuf.ch_count= s->used_ch_count;
        if(s->resample)
            s->in_buffer.ch_count= s->used_ch_count;
    }
    if(!s->resample_first){
        s->midbuf.ch_count= s->out.ch_count;
        if(s->resample)
            s->in_buffer.ch_count = s->out.ch_count;
    }

    set_audiodata_fmt(&s->postin, s->int_sample_fmt);
    set_audiodata_fmt(&s->midbuf, s->int_sample_fmt);
    set_audiodata_fmt(&s->preout, s->int_sample_fmt);

    if(s->resample){
        set_audiodata_fmt(&s->in_buffer, s->int_sample_fmt);
    }

    av_assert0(!s->preout.count);
    s->dither.noise = s->preout;
    s->dither.temp  = s->preout;
    if (s->dither.method > SWR_DITHER_NS) {
        s->dither.noise.bps = 4;
        s->dither.noise.fmt = AV_SAMPLE_FMT_FLTP;
        s->dither.noise_scale = 1;
    }

    if(s->rematrix || s->dither.method) {
        ret = swri_rematrix_init(s);
        if (ret < 0)
            goto fail;
    }

    return 0;
fail:
    swr_close(s);
    return ret;

}

int swri_realloc_audio(AudioData *a, int count){
    int i, countb;
    AudioData old;

    if(count < 0 || count > INT_MAX/2/a->bps/a->ch_count)
        return AVERROR(EINVAL);

    if(a->count >= count)
        return 0;

    count*=2;

    countb= FFALIGN(count*a->bps, ALIGN);
    old= *a;

    av_assert0(a->bps);
    av_assert0(a->ch_count);

    a->data = av_calloc(countb, a->ch_count);
    if(!a->data)
        return AVERROR(ENOMEM);
    for(i=0; i<a->ch_count; i++){
        a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
        if(a->count && a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
    }
    if(a->count && !a->planar) memcpy(a->ch[0], old.ch[0], a->count*a->ch_count*a->bps);
    av_freep(&old.data);
    a->count= count;

    return 1;
}

static void copy(AudioData *out, AudioData *in,
                 int count){
    av_assert0(out->planar == in->planar);
    av_assert0(out->bps == in->bps);
    av_assert0(out->ch_count == in->ch_count);
    if(out->planar){
        int ch;
        for(ch=0; ch<out->ch_count; ch++)
            memcpy(out->ch[ch], in->ch[ch], count*out->bps);
    }else
        memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
}

static void fill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
    int i;
    if(!in_arg){
        memset(out->ch, 0, sizeof(out->ch));
    }else if(out->planar){
        for(i=0; i<out->ch_count; i++)
            out->ch[i]= in_arg[i];
    }else{
        for(i=0; i<out->ch_count; i++)
            out->ch[i]= in_arg[0] + i*out->bps;
    }
}

static void reversefill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
    int i;
    if(out->planar){
        for(i=0; i<out->ch_count; i++)
            in_arg[i]= out->ch[i];
    }else{
        in_arg[0]= out->ch[0];
    }
}

/**
 *
 * out may be equal in.
 */
static void buf_set(AudioData *out, AudioData *in, int count){
    int ch;
    if(in->planar){
        for(ch=0; ch<out->ch_count; ch++)
            out->ch[ch]= in->ch[ch] + count*out->bps;
    }else{
        for(ch=out->ch_count-1; ch>=0; ch--)
            out->ch[ch]= in->ch[0] + (ch + count*out->ch_count) * out->bps;
    }
}

/**
 *
 * @return number of samples output per channel
 */
static int resample(SwrContext *s, AudioData *out_param, int out_count,
                             const AudioData * in_param, int in_count){
    AudioData in, out, tmp;
    int ret_sum=0;
    int border=0;
    int padless = ARCH_X86 && s->engine == SWR_ENGINE_SWR ? 7 : 0;

    av_assert1(s->in_buffer.ch_count == in_param->ch_count);
    av_assert1(s->in_buffer.planar   == in_param->planar);
    av_assert1(s->in_buffer.fmt      == in_param->fmt);

    tmp=out=*out_param;
    in =  *in_param;

    border = s->resampler->invert_initial_buffer(s->resample, &s->in_buffer,
                 &in, in_count, &s->in_buffer_index, &s->in_buffer_count);
    if (border == INT_MAX) {
        return 0;
    } else if (border < 0) {
        return border;
    } else if (border) {
        buf_set(&in, &in, border);
        in_count -= border;
        s->resample_in_constraint = 0;
    }

    do{
        int ret, size, consumed;
        if(!s->resample_in_constraint && s->in_buffer_count){
            buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
            ret= s->resampler->multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
            out_count -= ret;
            ret_sum += ret;
            buf_set(&out, &out, ret);
            s->in_buffer_count -= consumed;
            s->in_buffer_index += consumed;

            if(!in_count)
                break;
            if(s->in_buffer_count <= border){
                buf_set(&in, &in, -s->in_buffer_count);
                in_count += s->in_buffer_count;
                s->in_buffer_count=0;
                s->in_buffer_index=0;
                border = 0;
            }
        }

        if((s->flushed || in_count > padless) && !s->in_buffer_count){
            s->in_buffer_index=0;
            ret= s->resampler->multiple_resample(s->resample, &out, out_count, &in, FFMAX(in_count-padless, 0), &consumed);
            out_count -= ret;
            ret_sum += ret;
            buf_set(&out, &out, ret);
            in_count -= consumed;
            buf_set(&in, &in, consumed);
        }

        //TODO is this check sane considering the advanced copy avoidance below
        size= s->in_buffer_index + s->in_buffer_count + in_count;
        if(   size > s->in_buffer.count
           && s->in_buffer_count + in_count <= s->in_buffer_index){
            buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
            copy(&s->in_buffer, &tmp, s->in_buffer_count);
            s->in_buffer_index=0;
        }else
            if((ret=swri_realloc_audio(&s->in_buffer, size)) < 0)
                return ret;

        if(in_count){
            int count= in_count;
            if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;

            buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
            copy(&tmp, &in, /*in_*/count);
            s->in_buffer_count += count;
            in_count -= count;
            border += count;
            buf_set(&in, &in, count);
            s->resample_in_constraint= 0;
            if(s->in_buffer_count != count || in_count)
                continue;
            if (padless) {
                padless = 0;
                continue;
            }
        }
        break;
    }while(1);

    s->resample_in_constraint= !!out_count;

    return ret_sum;
}

static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_count,
                                                      AudioData *in , int  in_count){
    AudioData *postin, *midbuf, *preout;
    int ret/*, in_max*/;
    AudioData preout_tmp, midbuf_tmp;

    if(s->full_convert){
        av_assert0(!s->resample);
        swri_audio_convert(s->full_convert, out, in, in_count);
        return out_count;
    }

//     in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
//     in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);

    if((ret=swri_realloc_audio(&s->postin, in_count))<0)
        return ret;
    if(s->resample_first){
        av_assert0(s->midbuf.ch_count == s->used_ch_count);
        if((ret=swri_realloc_audio(&s->midbuf, out_count))<0)
            return ret;
    }else{
        av_assert0(s->midbuf.ch_count ==  s->out.ch_count);
        if((ret=swri_realloc_audio(&s->midbuf,  in_count))<0)
            return ret;
    }
    if((ret=swri_realloc_audio(&s->preout, out_count))<0)
        return ret;

    postin= &s->postin;

    midbuf_tmp= s->midbuf;
    midbuf= &midbuf_tmp;
    preout_tmp= s->preout;
    preout= &preout_tmp;

    if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar && !s->channel_map)
        postin= in;

    if(s->resample_first ? !s->resample : !s->rematrix)
        midbuf= postin;

    if(s->resample_first ? !s->rematrix : !s->resample)
        preout= midbuf;

    if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar
       && !(s->out_sample_fmt==AV_SAMPLE_FMT_S32P && (s->dither.output_sample_bits&31))){
        if(preout==in){
            out_count= FFMIN(out_count, in_count); //TODO check at the end if this is needed or redundant
            av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
            copy(out, in, out_count);
            return out_count;
        }
        else if(preout==postin) preout= midbuf= postin= out;
        else if(preout==midbuf) preout= midbuf= out;
        else                    preout= out;
    }

    if(in != postin){
        swri_audio_convert(s->in_convert, postin, in, in_count);
    }

    if(s->resample_first){
        if(postin != midbuf)
            if ((out_count = resample(s, midbuf, out_count, postin, in_count)) < 0)
                return out_count;
        if(midbuf != preout)
            swri_rematrix(s, preout, midbuf, out_count, preout==out);
    }else{
        if(postin != midbuf)
            swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
        if(midbuf != preout)
            if ((out_count = resample(s, preout, out_count, midbuf, in_count)) < 0)
                return out_count;
    }

    if(preout != out && out_count){
        AudioData *conv_src = preout;
        if(s->dither.method){
            int ch;
            int dither_count= FFMAX(out_count, 1<<16);

            if (preout == in) {
                conv_src = &s->dither.temp;
                if((ret=swri_realloc_audio(&s->dither.temp, dither_count))<0)
                    return ret;
            }

            if((ret=swri_realloc_audio(&s->dither.noise, dither_count))<0)
                return ret;
            if(ret)
                for(ch=0; ch<s->dither.noise.ch_count; ch++)
                    if((ret=swri_get_dither(s, s->dither.noise.ch[ch], s->dither.noise.count, (12345678913579ULL*ch + 3141592) % 2718281828U, s->dither.noise.fmt))<0)
                        return ret;
            av_assert0(s->dither.noise.ch_count == preout->ch_count);

            if(s->dither.noise_pos + out_count > s->dither.noise.count)
                s->dither.noise_pos = 0;

            if (s->dither.method < SWR_DITHER_NS){
                if (s->mix_2_1_simd) {
                    int len1= out_count&~15;
                    int off = len1 * preout->bps;

                    if(len1)
                        for(ch=0; ch<preout->ch_count; ch++)
                            s->mix_2_1_simd(conv_src->ch[ch], preout->ch[ch], s->dither.noise.ch[ch] + s->dither.noise.bps * s->dither.noise_pos, s->native_simd_one, 0, 0, len1);
                    if(out_count != len1)
                        for(ch=0; ch<preout->ch_count; ch++)
                            s->mix_2_1_f(conv_src->ch[ch] + off, preout->ch[ch] + off, s->dither.noise.ch[ch] + s->dither.noise.bps * s->dither.noise_pos + off, s->native_one, 0, 0, out_count - len1);
                } else {
                    for(ch=0; ch<preout->ch_count; ch++)
                        s->mix_2_1_f(conv_src->ch[ch], preout->ch[ch], s->dither.noise.ch[ch] + s->dither.noise.bps * s->dither.noise_pos, s->native_one, 0, 0, out_count);
                }
            } else {
                switch(s->int_sample_fmt) {
                case AV_SAMPLE_FMT_S16P :swri_noise_shaping_int16(s, conv_src, preout, &s->dither.noise, out_count); break;
                case AV_SAMPLE_FMT_S32P :swri_noise_shaping_int32(s, conv_src, preout, &s->dither.noise, out_count); break;
                case AV_SAMPLE_FMT_FLTP :swri_noise_shaping_float(s, conv_src, preout, &s->dither.noise, out_count); break;
                case AV_SAMPLE_FMT_DBLP :swri_noise_shaping_double(s,conv_src, preout, &s->dither.noise, out_count); break;
                }
            }
            s->dither.noise_pos += out_count;
        }
//FIXME packed doesn't need more than 1 chan here!
        swri_audio_convert(s->out_convert, out, conv_src, out_count);
    }
    return out_count;
}

int swr_is_initialized(struct SwrContext *s) {
    return !!s->in_buffer.ch_count;
}

int attribute_align_arg swr_convert(struct SwrContext *s,
                                          uint8_t **out_arg, int out_count,
                                    const uint8_t **in_arg,  int in_count)
{
    AudioData * in= &s->in;
    AudioData *out= &s->out;
    int av_unused max_output;

    if (!swr_is_initialized(s)) {
        av_log(s, AV_LOG_ERROR, "Context has not been initialized\n");
        return AVERROR(EINVAL);
    }
#if defined(ASSERT_LEVEL) && ASSERT_LEVEL >1
    max_output = swr_get_out_samples(s, in_count);
#endif

    while(s->drop_output > 0){
        int ret;
        uint8_t *tmp_arg[SWR_CH_MAX];
#define MAX_DROP_STEP 16384
        if((ret=swri_realloc_audio(&s->drop_temp, FFMIN(s->drop_output, MAX_DROP_STEP)))<0)
            return ret;

        reversefill_audiodata(&s->drop_temp, tmp_arg);
        s->drop_output *= -1; //FIXME find a less hackish solution
        ret = swr_convert(s, tmp_arg, FFMIN(-s->drop_output, MAX_DROP_STEP), in_arg, in_count); //FIXME optimize but this is as good as never called so maybe it doesn't matter
        s->drop_output *= -1;
        in_count = 0;
        if(ret>0) {
            s->drop_output -= ret;
            if (!s->drop_output && !out_arg)
                return 0;
            continue;
        }

        av_assert0(s->drop_output);
        return 0;
    }

    if(!in_arg){
        if(s->resample){
            if (!s->flushed)
                s->resampler->flush(s);
            s->resample_in_constraint = 0;
            s->flushed = 1;
        }else if(!s->in_buffer_count){
            return 0;
        }
    }else
        fill_audiodata(in ,  (void*)in_arg);

    fill_audiodata(out, out_arg);

    if(s->resample){
        int ret = swr_convert_internal(s, out, out_count, in, in_count);
        if(ret>0 && !s->drop_output)
            s->outpts += ret * (int64_t)s->in_sample_rate;

        av_assert2(max_output < 0 || ret <= max_output);

        return ret;
    }else{
        AudioData tmp= *in;
        int ret2=0;
        int ret, size;
        size = FFMIN(out_count, s->in_buffer_count);
        if(size){
            buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
            ret= swr_convert_internal(s, out, size, &tmp, size);
            if(ret<0)
                return ret;
            ret2= ret;
            s->in_buffer_count -= ret;
            s->in_buffer_index += ret;
            buf_set(out, out, ret);
            out_count -= ret;
            if(!s->in_buffer_count)
                s->in_buffer_index = 0;
        }

        if(in_count){
            size= s->in_buffer_index + s->in_buffer_count + in_count - out_count;

            if(in_count > out_count) { //FIXME move after swr_convert_internal
                if(   size > s->in_buffer.count
                && s->in_buffer_count + in_count - out_count <= s->in_buffer_index){
                    buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
                    copy(&s->in_buffer, &tmp, s->in_buffer_count);
                    s->in_buffer_index=0;
                }else
                    if((ret=swri_realloc_audio(&s->in_buffer, size)) < 0)
                        return ret;
            }

            if(out_count){
                size = FFMIN(in_count, out_count);
                ret= swr_convert_internal(s, out, size, in, size);
                if(ret<0)
                    return ret;
                buf_set(in, in, ret);
                in_count -= ret;
                ret2 += ret;
            }
            if(in_count){
                buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
                copy(&tmp, in, in_count);
                s->in_buffer_count += in_count;
            }
        }
        if(ret2>0 && !s->drop_output)
            s->outpts += ret2 * (int64_t)s->in_sample_rate;
        av_assert2(max_output < 0 || ret2 < 0 || ret2 <= max_output);
        return ret2;
    }
}

int swr_drop_output(struct SwrContext *s, int count){
    const uint8_t *tmp_arg[SWR_CH_MAX];
    s->drop_output += count;

    if(s->drop_output <= 0)
        return 0;

    av_log(s, AV_LOG_VERBOSE, "discarding %d audio samples\n", count);
    return swr_convert(s, NULL, s->drop_output, tmp_arg, 0);
}

int swr_inject_silence(struct SwrContext *s, int count){
    int ret, i;
    uint8_t *tmp_arg[SWR_CH_MAX];

    if(count <= 0)
        return 0;

#define MAX_SILENCE_STEP 16384
    while (count > MAX_SILENCE_STEP) {
        if ((ret = swr_inject_silence(s, MAX_SILENCE_STEP)) < 0)
            return ret;
        count -= MAX_SILENCE_STEP;
    }

    if((ret=swri_realloc_audio(&s->silence, count))<0)
        return ret;

    if(s->silence.planar) for(i=0; i<s->silence.ch_count; i++) {
        memset(s->silence.ch[i], s->silence.bps==1 ? 0x80 : 0, count*s->silence.bps);
    } else
        memset(s->silence.ch[0], s->silence.bps==1 ? 0x80 : 0, count*s->silence.bps*s->silence.ch_count);

    reversefill_audiodata(&s->silence, tmp_arg);
    av_log(s, AV_LOG_VERBOSE, "adding %d audio samples of silence\n", count);
    ret = swr_convert(s, NULL, 0, (const uint8_t**)tmp_arg, count);
    return ret;
}

int64_t swr_get_delay(struct SwrContext *s, int64_t base){
    if (s->resampler && s->resample){
        return s->resampler->get_delay(s, base);
    }else{
        return (s->in_buffer_count*base + (s->in_sample_rate>>1))/ s->in_sample_rate;
    }
}

int swr_get_out_samples(struct SwrContext *s, int in_samples)
{
    int64_t out_samples;

    if (in_samples < 0)
        return AVERROR(EINVAL);

    if (s->resampler && s->resample) {
        if (!s->resampler->get_out_samples)
            return AVERROR(ENOSYS);
        out_samples = s->resampler->get_out_samples(s, in_samples);
    } else {
        out_samples = s->in_buffer_count + in_samples;
        av_assert0(s->out_sample_rate == s->in_sample_rate);
    }

    if (out_samples > INT_MAX)
        return AVERROR(EINVAL);

    return out_samples;
}

int swr_set_compensation(struct SwrContext *s, int sample_delta, int compensation_distance){
    int ret;

    if (!s || compensation_distance < 0)
        return AVERROR(EINVAL);
    if (!compensation_distance && sample_delta)
        return AVERROR(EINVAL);
    if (!s->resample) {
        s->flags |= SWR_FLAG_RESAMPLE;
        ret = swr_init(s);
        if (ret < 0)
            return ret;
    }
    if (!s->resampler->set_compensation){
        return AVERROR(EINVAL);
    }else{
        return s->resampler->set_compensation(s->resample, sample_delta, compensation_distance);
    }
}

int64_t swr_next_pts(struct SwrContext *s, int64_t pts){
    if(pts == INT64_MIN)
        return s->outpts;

    if (s->firstpts == AV_NOPTS_VALUE)
        s->outpts = s->firstpts = pts;

    if(s->min_compensation >= FLT_MAX) {
        return (s->outpts = pts - swr_get_delay(s, s->in_sample_rate * (int64_t)s->out_sample_rate));
    } else {
        int64_t delta = pts - swr_get_delay(s, s->in_sample_rate * (int64_t)s->out_sample_rate) - s->outpts + s->drop_output*(int64_t)s->in_sample_rate;
        double fdelta = delta /(double)(s->in_sample_rate * (int64_t)s->out_sample_rate);

        if(fabs(fdelta) > s->min_compensation) {
            if(s->outpts == s->firstpts || fabs(fdelta) > s->min_hard_compensation){
                int ret;
                if(delta > 0) ret = swr_inject_silence(s,  delta / s->out_sample_rate);
                else          ret = swr_drop_output   (s, -delta / s-> in_sample_rate);
                if(ret<0){
                    av_log(s, AV_LOG_ERROR, "Failed to compensate for timestamp delta of %f\n", fdelta);
                }
            } else if(s->soft_compensation_duration && s->max_soft_compensation) {
                int duration = s->out_sample_rate * s->soft_compensation_duration;
                double max_soft_compensation = s->max_soft_compensation / (s->max_soft_compensation < 0 ? -s->in_sample_rate : 1);
                int comp = av_clipf(fdelta, -max_soft_compensation, max_soft_compensation) * duration ;
                av_log(s, AV_LOG_VERBOSE, "compensating audio timestamp drift:%f compensation:%d in:%d\n", fdelta, comp, duration);
                swr_set_compensation(s, comp, duration);
            }
        }

        return s->outpts;
    }
}