git.sesse.net Git - ffmpeg/blob - libswresample/swresample.c

   1 /*
   2  * Copyright (C) 2011-2013 Michael Niedermayer (michaelni@gmx.at)
   3  *
   4  * This file is part of libswresample
   5  *
   6  * libswresample is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * libswresample 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with libswresample; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "libavutil/opt.h"
  22 #include "swresample_internal.h"
  23 #include "audioconvert.h"
  24 #include "libavutil/avassert.h"
  25 #include "libavutil/channel_layout.h"
  26 #include "libavutil/internal.h"
  27
  28 #include <float.h>
  29
  30 #define ALIGN 32
  31
  32 #include "libavutil/ffversion.h"
  33 const char swr_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
  34
  35 unsigned swresample_version(void)
  36 {
  37     av_assert0(LIBSWRESAMPLE_VERSION_MICRO >= 100);
  38     return LIBSWRESAMPLE_VERSION_INT;
  39 }
  40
  41 const char *swresample_configuration(void)
  42 {
  43     return FFMPEG_CONFIGURATION;
  44 }
  45
  46 const char *swresample_license(void)
  47 {
  48 #define LICENSE_PREFIX "libswresample license: "
  49     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
  50 }
  51
  52 int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map){
  53     if(!s || s->in_convert) // s needs to be allocated but not initialized
  54         return AVERROR(EINVAL);
  55     s->channel_map = channel_map;
  56     return 0;
  57 }
  58
  59 struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
  60                                       int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
  61                                       int64_t  in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
  62                                       int log_offset, void *log_ctx){
  63     if(!s) s= swr_alloc();
  64     if(!s) return NULL;
  65
  66     s->log_level_offset= log_offset;
  67     s->log_ctx= log_ctx;
  68
  69     if (av_opt_set_int(s, "ocl", out_ch_layout,   0) < 0)
  70         goto fail;
  71
  72     if (av_opt_set_int(s, "osf", out_sample_fmt,  0) < 0)
  73         goto fail;
  74
  75     if (av_opt_set_int(s, "osr", out_sample_rate, 0) < 0)
  76         goto fail;
  77
  78     if (av_opt_set_int(s, "icl", in_ch_layout,    0) < 0)
  79         goto fail;
  80
  81     if (av_opt_set_int(s, "isf", in_sample_fmt,   0) < 0)
  82         goto fail;
  83
  84     if (av_opt_set_int(s, "isr", in_sample_rate,  0) < 0)
  85         goto fail;
  86
  87     if (av_opt_set_int(s, "ich", av_get_channel_layout_nb_channels(s-> user_in_ch_layout), 0) < 0)
  88         goto fail;
  89
  90     if (av_opt_set_int(s, "och", av_get_channel_layout_nb_channels(s->user_out_ch_layout), 0) < 0)
  91         goto fail;
  92
  93     av_opt_set_int(s, "uch", 0, 0);
  94     return s;
  95 fail:
  96     av_log(s, AV_LOG_ERROR, "Failed to set option\n");
  97     swr_free(&s);
  98     return NULL;
  99 }
 100
 101 static void set_audiodata_fmt(AudioData *a, enum AVSampleFormat fmt){
 102     a->fmt   = fmt;
 103     a->bps   = av_get_bytes_per_sample(fmt);
 104     a->planar= av_sample_fmt_is_planar(fmt);
 105     if (a->ch_count == 1)
 106         a->planar = 1;
 107 }
 108
 109 static void free_temp(AudioData *a){
 110     av_free(a->data);
 111     memset(a, 0, sizeof(*a));
 112 }
 113
 114 static void clear_context(SwrContext *s){
 115     s->in_buffer_index= 0;
 116     s->in_buffer_count= 0;
 117     s->resample_in_constraint= 0;
 118     memset(s->in.ch, 0, sizeof(s->in.ch));
 119     memset(s->out.ch, 0, sizeof(s->out.ch));
 120     free_temp(&s->postin);
 121     free_temp(&s->midbuf);
 122     free_temp(&s->preout);
 123     free_temp(&s->in_buffer);
 124     free_temp(&s->silence);
 125     free_temp(&s->drop_temp);
 126     free_temp(&s->dither.noise);
 127     free_temp(&s->dither.temp);
 128     swri_audio_convert_free(&s-> in_convert);
 129     swri_audio_convert_free(&s->out_convert);
 130     swri_audio_convert_free(&s->full_convert);
 131     swri_rematrix_free(s);
 132
 133     s->delayed_samples_fixup = 0;
 134     s->flushed = 0;
 135 }
 136
 137 av_cold void swr_free(SwrContext **ss){
 138     SwrContext *s= *ss;
 139     if(s){
 140         clear_context(s);
 141         if (s->resampler)
 142             s->resampler->free(&s->resample);
 143     }
 144
 145     av_freep(ss);
 146 }
 147
 148 av_cold void swr_close(SwrContext *s){
 149     clear_context(s);
 150 }
 151
 152 av_cold int swr_init(struct SwrContext *s){
 153     int ret;
 154     char l1[1024], l2[1024];
 155
 156     clear_context(s);
 157
 158     if(s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
 159         av_log(s, AV_LOG_ERROR, "Requested input sample format %d is invalid\n", s->in_sample_fmt);
 160         return AVERROR(EINVAL);
 161     }
 162     if(s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
 163         av_log(s, AV_LOG_ERROR, "Requested output sample format %d is invalid\n", s->out_sample_fmt);
 164         return AVERROR(EINVAL);
 165     }
 166
 167     s->out.ch_count  = s-> user_out_ch_count;
 168     s-> in.ch_count  = s->  user_in_ch_count;
 169     s->used_ch_count = s->user_used_ch_count;
 170
 171     s-> in_ch_layout = s-> user_in_ch_layout;
 172     s->out_ch_layout = s->user_out_ch_layout;
 173
 174     s->int_sample_fmt= s->user_int_sample_fmt;
 175
 176     s->dither.method = s->user_dither_method;
 177
 178     if(av_get_channel_layout_nb_channels(s-> in_ch_layout) > SWR_CH_MAX) {
 179         av_log(s, AV_LOG_WARNING, "Input channel layout 0x%"PRIx64" is invalid or unsupported.\n", s-> in_ch_layout);
 180         s->in_ch_layout = 0;
 181     }
 182
 183     if(av_get_channel_layout_nb_channels(s->out_ch_layout) > SWR_CH_MAX) {
 184         av_log(s, AV_LOG_WARNING, "Output channel layout 0x%"PRIx64" is invalid or unsupported.\n", s->out_ch_layout);
 185         s->out_ch_layout = 0;
 186     }
 187
 188     switch(s->engine){
 189 #if CONFIG_LIBSOXR
 190         case SWR_ENGINE_SOXR: s->resampler = &swri_soxr_resampler; break;
 191 #endif
 192         case SWR_ENGINE_SWR : s->resampler = &swri_resampler; break;
 193         default:
 194             av_log(s, AV_LOG_ERROR, "Requested resampling engine is unavailable\n");
 195             return AVERROR(EINVAL);
 196     }
 197
 198     if(!s->used_ch_count)
 199         s->used_ch_count= s->in.ch_count;
 200
 201     if(s->used_ch_count && s-> in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s-> in_ch_layout)){
 202         av_log(s, AV_LOG_WARNING, "Input channel layout has a different number of channels than the number of used channels, ignoring layout\n");
 203         s-> in_ch_layout= 0;
 204     }
 205
 206     if(!s-> in_ch_layout)
 207         s-> in_ch_layout= av_get_default_channel_layout(s->used_ch_count);
 208     if(!s->out_ch_layout)
 209         s->out_ch_layout= av_get_default_channel_layout(s->out.ch_count);
 210
 211     s->rematrix= s->out_ch_layout  !=s->in_ch_layout || s->rematrix_volume!=1.0 ||
 212                  s->rematrix_custom;
 213
 214     if(s->int_sample_fmt == AV_SAMPLE_FMT_NONE){
 215         if(   av_get_bytes_per_sample(s-> in_sample_fmt) <= 2
 216            && av_get_bytes_per_sample(s->out_sample_fmt) <= 2){
 217             s->int_sample_fmt= AV_SAMPLE_FMT_S16P;
 218         }else if(   av_get_bytes_per_sample(s-> in_sample_fmt) <= 2
 219            && !s->rematrix
 220            && s->out_sample_rate==s->in_sample_rate
 221            && !(s->flags & SWR_FLAG_RESAMPLE)){
 222             s->int_sample_fmt= AV_SAMPLE_FMT_S16P;
 223         }else if(   av_get_planar_sample_fmt(s-> in_sample_fmt) == AV_SAMPLE_FMT_S32P
 224                  && av_get_planar_sample_fmt(s->out_sample_fmt) == AV_SAMPLE_FMT_S32P
 225                  && !s->rematrix
 226                  && s->engine != SWR_ENGINE_SOXR){
 227             s->int_sample_fmt= AV_SAMPLE_FMT_S32P;
 228         }else if(av_get_bytes_per_sample(s->in_sample_fmt) <= 4){
 229             s->int_sample_fmt= AV_SAMPLE_FMT_FLTP;
 230         }else{
 231             s->int_sample_fmt= AV_SAMPLE_FMT_DBLP;
 232         }
 233     }
 234     av_log(s, AV_LOG_DEBUG, "Using %s internally between filters\n", av_get_sample_fmt_name(s->int_sample_fmt));
 235
 236     if(   s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 237         &&s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 238         &&s->int_sample_fmt != AV_SAMPLE_FMT_S64P
 239         &&s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
 240         &&s->int_sample_fmt != AV_SAMPLE_FMT_DBLP){
 241         av_log(s, AV_LOG_ERROR, "Requested sample format %s is not supported internally, S16/S32/S64/FLT/DBL is supported\n", av_get_sample_fmt_name(s->int_sample_fmt));
 242         return AVERROR(EINVAL);
 243     }
 244
 245     set_audiodata_fmt(&s-> in, s-> in_sample_fmt);
 246     set_audiodata_fmt(&s->out, s->out_sample_fmt);
 247
 248     if (s->firstpts_in_samples != AV_NOPTS_VALUE) {
 249         if (!s->async && s->min_compensation >= FLT_MAX/2)
 250             s->async = 1;
 251         s->firstpts =
 252         s->outpts   = s->firstpts_in_samples * s->out_sample_rate;
 253     } else
 254         s->firstpts = AV_NOPTS_VALUE;
 255
 256     if (s->async) {
 257         if (s->min_compensation >= FLT_MAX/2)
 258             s->min_compensation = 0.001;
 259         if (s->async > 1.0001) {
 260             s->max_soft_compensation = s->async / (double) s->in_sample_rate;
 261         }
 262     }
 263
 264     if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
 265         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);
 266         if (!s->resample) {
 267             av_log(s, AV_LOG_ERROR, "Failed to initialize resampler\n");
 268             return AVERROR(ENOMEM);
 269         }
 270     }else
 271         s->resampler->free(&s->resample);
 272     if(    s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 273         && s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 274         && s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
 275         && s->int_sample_fmt != AV_SAMPLE_FMT_DBLP
 276         && s->resample){
 277         av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16/s32/flt/dbl\n");
 278         ret = AVERROR(EINVAL);
 279         goto fail;
 280     }
 281
 282 #define RSC 1 //FIXME finetune
 283     if(!s-> in.ch_count)
 284         s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
 285     if(!s->used_ch_count)
 286         s->used_ch_count= s->in.ch_count;
 287     if(!s->out.ch_count)
 288         s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
 289
 290     if(!s-> in.ch_count){
 291         av_assert0(!s->in_ch_layout);
 292         av_log(s, AV_LOG_ERROR, "Input channel count and layout are unset\n");
 293         ret = AVERROR(EINVAL);
 294         goto fail;
 295     }
 296
 297     av_get_channel_layout_string(l1, sizeof(l1), s-> in.ch_count, s-> in_ch_layout);
 298     av_get_channel_layout_string(l2, sizeof(l2), s->out.ch_count, s->out_ch_layout);
 299     if (s->out_ch_layout && s->out.ch_count != av_get_channel_layout_nb_channels(s->out_ch_layout)) {
 300         av_log(s, AV_LOG_ERROR, "Output channel layout %s mismatches specified channel count %d\n", l2, s->out.ch_count);
 301         ret = AVERROR(EINVAL);
 302         goto fail;
 303     }
 304     if (s->in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s->in_ch_layout)) {
 305         av_log(s, AV_LOG_ERROR, "Input channel layout %s mismatches specified channel count %d\n", l1, s->used_ch_count);
 306         ret = AVERROR(EINVAL);
 307         goto fail;
 308     }
 309
 310     if ((!s->out_ch_layout || !s->in_ch_layout) && s->used_ch_count != s->out.ch_count && !s->rematrix_custom) {
 311         av_log(s, AV_LOG_ERROR, "Rematrix is needed between %s and %s "
 312                "but there is not enough information to do it\n", l1, l2);
 313         ret = AVERROR(EINVAL);
 314         goto fail;
 315     }
 316
 317 av_assert0(s->used_ch_count);
 318 av_assert0(s->out.ch_count);
 319     s->resample_first= RSC*s->out.ch_count/s->in.ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;
 320
 321     s->in_buffer= s->in;
 322     s->silence  = s->in;
 323     s->drop_temp= s->out;
 324
 325     if ((ret = swri_dither_init(s, s->out_sample_fmt, s->int_sample_fmt)) < 0)
 326         goto fail;
 327
 328     if(!s->resample && !s->rematrix && !s->channel_map && !s->dither.method){
 329         s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt,
 330                                                    s-> in_sample_fmt, s-> in.ch_count, NULL, 0);
 331         return 0;
 332     }
 333
 334     s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt,
 335                                              s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0);
 336     s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt,
 337                                              s->int_sample_fmt, s->out.ch_count, NULL, 0);
 338
 339     if (!s->in_convert || !s->out_convert) {
 340         ret = AVERROR(ENOMEM);
 341         goto fail;
 342     }
 343
 344     s->postin= s->in;
 345     s->preout= s->out;
 346     s->midbuf= s->in;
 347
 348     if(s->channel_map){
 349         s->postin.ch_count=
 350         s->midbuf.ch_count= s->used_ch_count;
 351         if(s->resample)
 352             s->in_buffer.ch_count= s->used_ch_count;
 353     }
 354     if(!s->resample_first){
 355         s->midbuf.ch_count= s->out.ch_count;
 356         if(s->resample)
 357             s->in_buffer.ch_count = s->out.ch_count;
 358     }
 359
 360     set_audiodata_fmt(&s->postin, s->int_sample_fmt);
 361     set_audiodata_fmt(&s->midbuf, s->int_sample_fmt);
 362     set_audiodata_fmt(&s->preout, s->int_sample_fmt);
 363
 364     if(s->resample){
 365         set_audiodata_fmt(&s->in_buffer, s->int_sample_fmt);
 366     }
 367
 368     av_assert0(!s->preout.count);
 369     s->dither.noise = s->preout;
 370     s->dither.temp  = s->preout;
 371     if (s->dither.method > SWR_DITHER_NS) {
 372         s->dither.noise.bps = 4;
 373         s->dither.noise.fmt = AV_SAMPLE_FMT_FLTP;
 374         s->dither.noise_scale = 1;
 375     }
 376
 377     if(s->rematrix || s->dither.method) {
 378         ret = swri_rematrix_init(s);
 379         if (ret < 0)
 380             goto fail;
 381     }
 382
 383     return 0;
 384 fail:
 385     swr_close(s);
 386     return ret;
 387
 388 }
 389
 390 int swri_realloc_audio(AudioData *a, int count){
 391     int i, countb;
 392     AudioData old;
 393
 394     if(count < 0 || count > INT_MAX/2/a->bps/a->ch_count)
 395         return AVERROR(EINVAL);
 396
 397     if(a->count >= count)
 398         return 0;
 399
 400     count*=2;
 401
 402     countb= FFALIGN(count*a->bps, ALIGN);
 403     old= *a;
 404
 405     av_assert0(a->bps);
 406     av_assert0(a->ch_count);
 407
 408     a->data= av_mallocz_array(countb, a->ch_count);
 409     if(!a->data)
 410         return AVERROR(ENOMEM);
 411     for(i=0; i<a->ch_count; i++){
 412         a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
 413         if(a->count && a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
 414     }
 415     if(a->count && !a->planar) memcpy(a->ch[0], old.ch[0], a->count*a->ch_count*a->bps);
 416     av_freep(&old.data);
 417     a->count= count;
 418
 419     return 1;
 420 }
 421
 422 static void copy(AudioData *out, AudioData *in,
 423                  int count){
 424     av_assert0(out->planar == in->planar);
 425     av_assert0(out->bps == in->bps);
 426     av_assert0(out->ch_count == in->ch_count);
 427     if(out->planar){
 428         int ch;
 429         for(ch=0; ch<out->ch_count; ch++)
 430             memcpy(out->ch[ch], in->ch[ch], count*out->bps);
 431     }else
 432         memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
 433 }
 434
 435 static void fill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 436     int i;
 437     if(!in_arg){
 438         memset(out->ch, 0, sizeof(out->ch));
 439     }else if(out->planar){
 440         for(i=0; i<out->ch_count; i++)
 441             out->ch[i]= in_arg[i];
 442     }else{
 443         for(i=0; i<out->ch_count; i++)
 444             out->ch[i]= in_arg[0] + i*out->bps;
 445     }
 446 }
 447
 448 static void reversefill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 449     int i;
 450     if(out->planar){
 451         for(i=0; i<out->ch_count; i++)
 452             in_arg[i]= out->ch[i];
 453     }else{
 454         in_arg[0]= out->ch[0];
 455     }
 456 }
 457
 458 /**
 459  *
 460  * out may be equal in.
 461  */
 462 static void buf_set(AudioData *out, AudioData *in, int count){
 463     int ch;
 464     if(in->planar){
 465         for(ch=0; ch<out->ch_count; ch++)
 466             out->ch[ch]= in->ch[ch] + count*out->bps;
 467     }else{
 468         for(ch=out->ch_count-1; ch>=0; ch--)
 469             out->ch[ch]= in->ch[0] + (ch + count*out->ch_count) * out->bps;
 470     }
 471 }
 472
 473 /**
 474  *
 475  * @return number of samples output per channel
 476  */
 477 static int resample(SwrContext *s, AudioData *out_param, int out_count,
 478                              const AudioData * in_param, int in_count){
 479     AudioData in, out, tmp;
 480     int ret_sum=0;
 481     int border=0;
 482     int padless = ARCH_X86 && s->engine == SWR_ENGINE_SWR ? 7 : 0;
 483
 484     av_assert1(s->in_buffer.ch_count == in_param->ch_count);
 485     av_assert1(s->in_buffer.planar   == in_param->planar);
 486     av_assert1(s->in_buffer.fmt      == in_param->fmt);
 487
 488     tmp=out=*out_param;
 489     in =  *in_param;
 490
 491     border = s->resampler->invert_initial_buffer(s->resample, &s->in_buffer,
 492                  &in, in_count, &s->in_buffer_index, &s->in_buffer_count);
 493     if (border == INT_MAX) {
 494         return 0;
 495     } else if (border < 0) {
 496         return border;
 497     } else if (border) {
 498         buf_set(&in, &in, border);
 499         in_count -= border;
 500         s->resample_in_constraint = 0;
 501     }
 502
 503     do{
 504         int ret, size, consumed;
 505         if(!s->resample_in_constraint && s->in_buffer_count){
 506             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 507             ret= s->resampler->multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
 508             out_count -= ret;
 509             ret_sum += ret;
 510             buf_set(&out, &out, ret);
 511             s->in_buffer_count -= consumed;
 512             s->in_buffer_index += consumed;
 513
 514             if(!in_count)
 515                 break;
 516             if(s->in_buffer_count <= border){
 517                 buf_set(&in, &in, -s->in_buffer_count);
 518                 in_count += s->in_buffer_count;
 519                 s->in_buffer_count=0;
 520                 s->in_buffer_index=0;
 521                 border = 0;
 522             }
 523         }
 524
 525         if((s->flushed || in_count > padless) && !s->in_buffer_count){
 526             s->in_buffer_index=0;
 527             ret= s->resampler->multiple_resample(s->resample, &out, out_count, &in, FFMAX(in_count-padless, 0), &consumed);
 528             out_count -= ret;
 529             ret_sum += ret;
 530             buf_set(&out, &out, ret);
 531             in_count -= consumed;
 532             buf_set(&in, &in, consumed);
 533         }
 534
 535         //TODO is this check sane considering the advanced copy avoidance below
 536         size= s->in_buffer_index + s->in_buffer_count + in_count;
 537         if(   size > s->in_buffer.count
 538            && s->in_buffer_count + in_count <= s->in_buffer_index){
 539             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 540             copy(&s->in_buffer, &tmp, s->in_buffer_count);
 541             s->in_buffer_index=0;
 542         }else
 543             if((ret=swri_realloc_audio(&s->in_buffer, size)) < 0)
 544                 return ret;
 545
 546         if(in_count){
 547             int count= in_count;
 548             if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;
 549
 550             buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 551             copy(&tmp, &in, /*in_*/count);
 552             s->in_buffer_count += count;
 553             in_count -= count;
 554             border += count;
 555             buf_set(&in, &in, count);
 556             s->resample_in_constraint= 0;
 557             if(s->in_buffer_count != count || in_count)
 558                 continue;
 559             if (padless) {
 560                 padless = 0;
 561                 continue;
 562             }
 563         }
 564         break;
 565     }while(1);
 566
 567     s->resample_in_constraint= !!out_count;
 568
 569     return ret_sum;
 570 }
 571
 572 static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_count,
 573                                                       AudioData *in , int  in_count){
 574     AudioData *postin, *midbuf, *preout;
 575     int ret/*, in_max*/;
 576     AudioData preout_tmp, midbuf_tmp;
 577
 578     if(s->full_convert){
 579         av_assert0(!s->resample);
 580         swri_audio_convert(s->full_convert, out, in, in_count);
 581         return out_count;
 582     }
 583
 584 //     in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
 585 //     in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);
 586
 587     if((ret=swri_realloc_audio(&s->postin, in_count))<0)
 588         return ret;
 589     if(s->resample_first){
 590         av_assert0(s->midbuf.ch_count == s->used_ch_count);
 591         if((ret=swri_realloc_audio(&s->midbuf, out_count))<0)
 592             return ret;
 593     }else{
 594         av_assert0(s->midbuf.ch_count ==  s->out.ch_count);
 595         if((ret=swri_realloc_audio(&s->midbuf,  in_count))<0)
 596             return ret;
 597     }
 598     if((ret=swri_realloc_audio(&s->preout, out_count))<0)
 599         return ret;
 600
 601     postin= &s->postin;
 602
 603     midbuf_tmp= s->midbuf;
 604     midbuf= &midbuf_tmp;
 605     preout_tmp= s->preout;
 606     preout= &preout_tmp;
 607
 608     if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar && !s->channel_map)
 609         postin= in;
 610
 611     if(s->resample_first ? !s->resample : !s->rematrix)
 612         midbuf= postin;
 613
 614     if(s->resample_first ? !s->rematrix : !s->resample)
 615         preout= midbuf;
 616
 617     if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar
 618        && !(s->out_sample_fmt==AV_SAMPLE_FMT_S32P && (s->dither.output_sample_bits&31))){
 619         if(preout==in){
 620             out_count= FFMIN(out_count, in_count); //TODO check at the end if this is needed or redundant
 621             av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
 622             copy(out, in, out_count);
 623             return out_count;
 624         }
 625         else if(preout==postin) preout= midbuf= postin= out;
 626         else if(preout==midbuf) preout= midbuf= out;
 627         else                    preout= out;
 628     }
 629
 630     if(in != postin){
 631         swri_audio_convert(s->in_convert, postin, in, in_count);
 632     }
 633
 634     if(s->resample_first){
 635         if(postin != midbuf)
 636             out_count= resample(s, midbuf, out_count, postin, in_count);
 637         if(midbuf != preout)
 638             swri_rematrix(s, preout, midbuf, out_count, preout==out);
 639     }else{
 640         if(postin != midbuf)
 641             swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
 642         if(midbuf != preout)
 643             out_count= resample(s, preout, out_count, midbuf, in_count);
 644     }
 645
 646     if(preout != out && out_count){
 647         AudioData *conv_src = preout;
 648         if(s->dither.method){
 649             int ch;
 650             int dither_count= FFMAX(out_count, 1<<16);
 651
 652             if (preout == in) {
 653                 conv_src = &s->dither.temp;
 654                 if((ret=swri_realloc_audio(&s->dither.temp, dither_count))<0)
 655                     return ret;
 656             }
 657
 658             if((ret=swri_realloc_audio(&s->dither.noise, dither_count))<0)
 659                 return ret;
 660             if(ret)
 661                 for(ch=0; ch<s->dither.noise.ch_count; ch++)
 662                     if((ret=swri_get_dither(s, s->dither.noise.ch[ch], s->dither.noise.count, (12345678913579ULL*ch + 3141592) % 2718281828U, s->dither.noise.fmt))<0)
 663                         return ret;
 664             av_assert0(s->dither.noise.ch_count == preout->ch_count);
 665
 666             if(s->dither.noise_pos + out_count > s->dither.noise.count)
 667                 s->dither.noise_pos = 0;
 668
 669             if (s->dither.method < SWR_DITHER_NS){
 670                 if (s->mix_2_1_simd) {
 671                     int len1= out_count&~15;
 672                     int off = len1 * preout->bps;
 673
 674                     if(len1)
 675                         for(ch=0; ch<preout->ch_count; ch++)
 676                             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);
 677                     if(out_count != len1)
 678                         for(ch=0; ch<preout->ch_count; ch++)
 679                             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 + len1, s->native_one, 0, 0, out_count - len1);
 680                 } else {
 681                     for(ch=0; ch<preout->ch_count; ch++)
 682                         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);
 683                 }
 684             } else {
 685                 switch(s->int_sample_fmt) {
 686                 case AV_SAMPLE_FMT_S16P :swri_noise_shaping_int16(s, conv_src, preout, &s->dither.noise, out_count); break;
 687                 case AV_SAMPLE_FMT_S32P :swri_noise_shaping_int32(s, conv_src, preout, &s->dither.noise, out_count); break;
 688                 case AV_SAMPLE_FMT_FLTP :swri_noise_shaping_float(s, conv_src, preout, &s->dither.noise, out_count); break;
 689                 case AV_SAMPLE_FMT_DBLP :swri_noise_shaping_double(s,conv_src, preout, &s->dither.noise, out_count); break;
 690                 }
 691             }
 692             s->dither.noise_pos += out_count;
 693         }
 694 //FIXME packed doesn't need more than 1 chan here!
 695         swri_audio_convert(s->out_convert, out, conv_src, out_count);
 696     }
 697     return out_count;
 698 }
 699
 700 int swr_is_initialized(struct SwrContext *s) {
 701     return !!s->in_buffer.ch_count;
 702 }
 703
 704 int attribute_align_arg swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
 705                                                     const uint8_t *in_arg [SWR_CH_MAX], int  in_count){
 706     AudioData * in= &s->in;
 707     AudioData *out= &s->out;
 708     int av_unused max_output;
 709
 710     if (!swr_is_initialized(s)) {
 711         av_log(s, AV_LOG_ERROR, "Context has not been initialized\n");
 712         return AVERROR(EINVAL);
 713     }
 714 #if defined(ASSERT_LEVEL) && ASSERT_LEVEL >1
 715     max_output = swr_get_out_samples(s, in_count);
 716 #endif
 717
 718     while(s->drop_output > 0){
 719         int ret;
 720         uint8_t *tmp_arg[SWR_CH_MAX];
 721 #define MAX_DROP_STEP 16384
 722         if((ret=swri_realloc_audio(&s->drop_temp, FFMIN(s->drop_output, MAX_DROP_STEP)))<0)
 723             return ret;
 724
 725         reversefill_audiodata(&s->drop_temp, tmp_arg);
 726         s->drop_output *= -1; //FIXME find a less hackish solution
 727         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
 728         s->drop_output *= -1;
 729         in_count = 0;
 730         if(ret>0) {
 731             s->drop_output -= ret;
 732             if (!s->drop_output && !out_arg)
 733                 return 0;
 734             continue;
 735         }
 736
 737         av_assert0(s->drop_output);
 738         return 0;
 739     }
 740
 741     if(!in_arg){
 742         if(s->resample){
 743             if (!s->flushed)
 744                 s->resampler->flush(s);
 745             s->resample_in_constraint = 0;
 746             s->flushed = 1;
 747         }else if(!s->in_buffer_count){
 748             return 0;
 749         }
 750     }else
 751         fill_audiodata(in ,  (void*)in_arg);
 752
 753     fill_audiodata(out, out_arg);
 754
 755     if(s->resample){
 756         int ret = swr_convert_internal(s, out, out_count, in, in_count);
 757         if(ret>0 && !s->drop_output)
 758             s->outpts += ret * (int64_t)s->in_sample_rate;
 759
 760         av_assert2(max_output < 0 || ret < 0 || ret <= max_output);
 761
 762         return ret;
 763     }else{
 764         AudioData tmp= *in;
 765         int ret2=0;
 766         int ret, size;
 767         size = FFMIN(out_count, s->in_buffer_count);
 768         if(size){
 769             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 770             ret= swr_convert_internal(s, out, size, &tmp, size);
 771             if(ret<0)
 772                 return ret;
 773             ret2= ret;
 774             s->in_buffer_count -= ret;
 775             s->in_buffer_index += ret;
 776             buf_set(out, out, ret);
 777             out_count -= ret;
 778             if(!s->in_buffer_count)
 779                 s->in_buffer_index = 0;
 780         }
 781
 782         if(in_count){
 783             size= s->in_buffer_index + s->in_buffer_count + in_count - out_count;
 784
 785             if(in_count > out_count) { //FIXME move after swr_convert_internal
 786                 if(   size > s->in_buffer.count
 787                 && s->in_buffer_count + in_count - out_count <= s->in_buffer_index){
 788                     buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 789                     copy(&s->in_buffer, &tmp, s->in_buffer_count);
 790                     s->in_buffer_index=0;
 791                 }else
 792                     if((ret=swri_realloc_audio(&s->in_buffer, size)) < 0)
 793                         return ret;
 794             }
 795
 796             if(out_count){
 797                 size = FFMIN(in_count, out_count);
 798                 ret= swr_convert_internal(s, out, size, in, size);
 799                 if(ret<0)
 800                     return ret;
 801                 buf_set(in, in, ret);
 802                 in_count -= ret;
 803                 ret2 += ret;
 804             }
 805             if(in_count){
 806                 buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 807                 copy(&tmp, in, in_count);
 808                 s->in_buffer_count += in_count;
 809             }
 810         }
 811         if(ret2>0 && !s->drop_output)
 812             s->outpts += ret2 * (int64_t)s->in_sample_rate;
 813         av_assert2(max_output < 0 || ret2 < 0 || ret2 <= max_output);
 814         return ret2;
 815     }
 816 }
 817
 818 int swr_drop_output(struct SwrContext *s, int count){
 819     const uint8_t *tmp_arg[SWR_CH_MAX];
 820     s->drop_output += count;
 821
 822     if(s->drop_output <= 0)
 823         return 0;
 824
 825     av_log(s, AV_LOG_VERBOSE, "discarding %d audio samples\n", count);
 826     return swr_convert(s, NULL, s->drop_output, tmp_arg, 0);
 827 }
 828
 829 int swr_inject_silence(struct SwrContext *s, int count){
 830     int ret, i;
 831     uint8_t *tmp_arg[SWR_CH_MAX];
 832
 833     if(count <= 0)
 834         return 0;
 835
 836 #define MAX_SILENCE_STEP 16384
 837     while (count > MAX_SILENCE_STEP) {
 838         if ((ret = swr_inject_silence(s, MAX_SILENCE_STEP)) < 0)
 839             return ret;
 840         count -= MAX_SILENCE_STEP;
 841     }
 842
 843     if((ret=swri_realloc_audio(&s->silence, count))<0)
 844         return ret;
 845
 846     if(s->silence.planar) for(i=0; i<s->silence.ch_count; i++) {
 847         memset(s->silence.ch[i], s->silence.bps==1 ? 0x80 : 0, count*s->silence.bps);
 848     } else
 849         memset(s->silence.ch[0], s->silence.bps==1 ? 0x80 : 0, count*s->silence.bps*s->silence.ch_count);
 850
 851     reversefill_audiodata(&s->silence, tmp_arg);
 852     av_log(s, AV_LOG_VERBOSE, "adding %d audio samples of silence\n", count);
 853     ret = swr_convert(s, NULL, 0, (const uint8_t**)tmp_arg, count);
 854     return ret;
 855 }
 856
 857 int64_t swr_get_delay(struct SwrContext *s, int64_t base){
 858     if (s->resampler && s->resample){
 859         return s->resampler->get_delay(s, base);
 860     }else{
 861         return (s->in_buffer_count*base + (s->in_sample_rate>>1))/ s->in_sample_rate;
 862     }
 863 }
 864
 865 int swr_get_out_samples(struct SwrContext *s, int in_samples)
 866 {
 867     int64_t out_samples;
 868
 869     if (in_samples < 0)
 870         return AVERROR(EINVAL);
 871
 872     if (s->resampler && s->resample) {
 873         if (!s->resampler->get_out_samples)
 874             return AVERROR(ENOSYS);
 875         out_samples = s->resampler->get_out_samples(s, in_samples);
 876     } else {
 877         out_samples = s->in_buffer_count + in_samples;
 878         av_assert0(s->out_sample_rate == s->in_sample_rate);
 879     }
 880
 881     if (out_samples > INT_MAX)
 882         return AVERROR(EINVAL);
 883
 884     return out_samples;
 885 }
 886
 887 int swr_set_compensation(struct SwrContext *s, int sample_delta, int compensation_distance){
 888     int ret;
 889
 890     if (!s || compensation_distance < 0)
 891         return AVERROR(EINVAL);
 892     if (!compensation_distance && sample_delta)
 893         return AVERROR(EINVAL);
 894     if (!s->resample) {
 895         s->flags |= SWR_FLAG_RESAMPLE;
 896         ret = swr_init(s);
 897         if (ret < 0)
 898             return ret;
 899     }
 900     if (!s->resampler->set_compensation){
 901         return AVERROR(EINVAL);
 902     }else{
 903         return s->resampler->set_compensation(s->resample, sample_delta, compensation_distance);
 904     }
 905 }
 906
 907 int64_t swr_next_pts(struct SwrContext *s, int64_t pts){
 908     if(pts == INT64_MIN)
 909         return s->outpts;
 910
 911     if (s->firstpts == AV_NOPTS_VALUE)
 912         s->outpts = s->firstpts = pts;
 913
 914     if(s->min_compensation >= FLT_MAX) {
 915         return (s->outpts = pts - swr_get_delay(s, s->in_sample_rate * (int64_t)s->out_sample_rate));
 916     } else {
 917         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;
 918         double fdelta = delta /(double)(s->in_sample_rate * (int64_t)s->out_sample_rate);
 919
 920         if(fabs(fdelta) > s->min_compensation) {
 921             if(s->outpts == s->firstpts || fabs(fdelta) > s->min_hard_compensation){
 922                 int ret;
 923                 if(delta > 0) ret = swr_inject_silence(s,  delta / s->out_sample_rate);
 924                 else          ret = swr_drop_output   (s, -delta / s-> in_sample_rate);
 925                 if(ret<0){
 926                     av_log(s, AV_LOG_ERROR, "Failed to compensate for timestamp delta of %f\n", fdelta);
 927                 }
 928             } else if(s->soft_compensation_duration && s->max_soft_compensation) {
 929                 int duration = s->out_sample_rate * s->soft_compensation_duration;
 930                 double max_soft_compensation = s->max_soft_compensation / (s->max_soft_compensation < 0 ? -s->in_sample_rate : 1);
 931                 int comp = av_clipf(fdelta, -max_soft_compensation, max_soft_compensation) * duration ;
 932                 av_log(s, AV_LOG_VERBOSE, "compensating audio timestamp drift:%f compensation:%d in:%d\n", fdelta, comp, duration);
 933                 swr_set_compensation(s, comp, duration);
 934             }
 935         }
 936
 937         return s->outpts;
 938     }
 939 }