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->out_sample_rate == s->in_sample_rate
 227                  && !(s->flags & SWR_FLAG_RESAMPLE)
 228                  && s->engine != SWR_ENGINE_SOXR){
 229             s->int_sample_fmt= AV_SAMPLE_FMT_S32P;
 230         }else if(av_get_bytes_per_sample(s->in_sample_fmt) <= 4){
 231             s->int_sample_fmt= AV_SAMPLE_FMT_FLTP;
 232         }else{
 233             s->int_sample_fmt= AV_SAMPLE_FMT_DBLP;
 234         }
 235     }
 236     av_log(s, AV_LOG_DEBUG, "Using %s internally between filters\n", av_get_sample_fmt_name(s->int_sample_fmt));
 237
 238     if(   s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 239         &&s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 240         &&s->int_sample_fmt != AV_SAMPLE_FMT_S64P
 241         &&s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
 242         &&s->int_sample_fmt != AV_SAMPLE_FMT_DBLP){
 243         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));
 244         return AVERROR(EINVAL);
 245     }
 246
 247     set_audiodata_fmt(&s-> in, s-> in_sample_fmt);
 248     set_audiodata_fmt(&s->out, s->out_sample_fmt);
 249
 250     if (s->firstpts_in_samples != AV_NOPTS_VALUE) {
 251         if (!s->async && s->min_compensation >= FLT_MAX/2)
 252             s->async = 1;
 253         s->firstpts =
 254         s->outpts   = s->firstpts_in_samples * s->out_sample_rate;
 255     } else
 256         s->firstpts = AV_NOPTS_VALUE;
 257
 258     if (s->async) {
 259         if (s->min_compensation >= FLT_MAX/2)
 260             s->min_compensation = 0.001;
 261         if (s->async > 1.0001) {
 262             s->max_soft_compensation = s->async / (double) s->in_sample_rate;
 263         }
 264     }
 265
 266     if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
 267         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);
 268         if (!s->resample) {
 269             av_log(s, AV_LOG_ERROR, "Failed to initialize resampler\n");
 270             return AVERROR(ENOMEM);
 271         }
 272     }else
 273         s->resampler->free(&s->resample);
 274     if(    s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 275         && s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 276         && s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
 277         && s->int_sample_fmt != AV_SAMPLE_FMT_DBLP
 278         && s->resample){
 279         av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16/s32/flt/dbl\n");
 280         ret = AVERROR(EINVAL);
 281         goto fail;
 282     }
 283
 284 #define RSC 1 //FIXME finetune
 285     if(!s-> in.ch_count)
 286         s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
 287     if(!s->used_ch_count)
 288         s->used_ch_count= s->in.ch_count;
 289     if(!s->out.ch_count)
 290         s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
 291
 292     if(!s-> in.ch_count){
 293         av_assert0(!s->in_ch_layout);
 294         av_log(s, AV_LOG_ERROR, "Input channel count and layout are unset\n");
 295         ret = AVERROR(EINVAL);
 296         goto fail;
 297     }
 298
 299     av_get_channel_layout_string(l1, sizeof(l1), s-> in.ch_count, s-> in_ch_layout);
 300     av_get_channel_layout_string(l2, sizeof(l2), s->out.ch_count, s->out_ch_layout);
 301     if (s->out_ch_layout && s->out.ch_count != av_get_channel_layout_nb_channels(s->out_ch_layout)) {
 302         av_log(s, AV_LOG_ERROR, "Output channel layout %s mismatches specified channel count %d\n", l2, s->out.ch_count);
 303         ret = AVERROR(EINVAL);
 304         goto fail;
 305     }
 306     if (s->in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s->in_ch_layout)) {
 307         av_log(s, AV_LOG_ERROR, "Input channel layout %s mismatches specified channel count %d\n", l1, s->used_ch_count);
 308         ret = AVERROR(EINVAL);
 309         goto fail;
 310     }
 311
 312     if ((!s->out_ch_layout || !s->in_ch_layout) && s->used_ch_count != s->out.ch_count && !s->rematrix_custom) {
 313         av_log(s, AV_LOG_ERROR, "Rematrix is needed between %s and %s "
 314                "but there is not enough information to do it\n", l1, l2);
 315         ret = AVERROR(EINVAL);
 316         goto fail;
 317     }
 318
 319 av_assert0(s->used_ch_count);
 320 av_assert0(s->out.ch_count);
 321     s->resample_first= RSC*s->out.ch_count/s->in.ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;
 322
 323     s->in_buffer= s->in;
 324     s->silence  = s->in;
 325     s->drop_temp= s->out;
 326
 327     if ((ret = swri_dither_init(s, s->out_sample_fmt, s->int_sample_fmt)) < 0)
 328         goto fail;
 329
 330     if(!s->resample && !s->rematrix && !s->channel_map && !s->dither.method){
 331         s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt,
 332                                                    s-> in_sample_fmt, s-> in.ch_count, NULL, 0);
 333         return 0;
 334     }
 335
 336     s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt,
 337                                              s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0);
 338     s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt,
 339                                              s->int_sample_fmt, s->out.ch_count, NULL, 0);
 340
 341     if (!s->in_convert || !s->out_convert) {
 342         ret = AVERROR(ENOMEM);
 343         goto fail;
 344     }
 345
 346     s->postin= s->in;
 347     s->preout= s->out;
 348     s->midbuf= s->in;
 349
 350     if(s->channel_map){
 351         s->postin.ch_count=
 352         s->midbuf.ch_count= s->used_ch_count;
 353         if(s->resample)
 354             s->in_buffer.ch_count= s->used_ch_count;
 355     }
 356     if(!s->resample_first){
 357         s->midbuf.ch_count= s->out.ch_count;
 358         if(s->resample)
 359             s->in_buffer.ch_count = s->out.ch_count;
 360     }
 361
 362     set_audiodata_fmt(&s->postin, s->int_sample_fmt);
 363     set_audiodata_fmt(&s->midbuf, s->int_sample_fmt);
 364     set_audiodata_fmt(&s->preout, s->int_sample_fmt);
 365
 366     if(s->resample){
 367         set_audiodata_fmt(&s->in_buffer, s->int_sample_fmt);
 368     }
 369
 370     av_assert0(!s->preout.count);
 371     s->dither.noise = s->preout;
 372     s->dither.temp  = s->preout;
 373     if (s->dither.method > SWR_DITHER_NS) {
 374         s->dither.noise.bps = 4;
 375         s->dither.noise.fmt = AV_SAMPLE_FMT_FLTP;
 376         s->dither.noise_scale = 1;
 377     }
 378
 379     if(s->rematrix || s->dither.method) {
 380         ret = swri_rematrix_init(s);
 381         if (ret < 0)
 382             goto fail;
 383     }
 384
 385     return 0;
 386 fail:
 387     swr_close(s);
 388     return ret;
 389
 390 }
 391
 392 int swri_realloc_audio(AudioData *a, int count){
 393     int i, countb;
 394     AudioData old;
 395
 396     if(count < 0 || count > INT_MAX/2/a->bps/a->ch_count)
 397         return AVERROR(EINVAL);
 398
 399     if(a->count >= count)
 400         return 0;
 401
 402     count*=2;
 403
 404     countb= FFALIGN(count*a->bps, ALIGN);
 405     old= *a;
 406
 407     av_assert0(a->bps);
 408     av_assert0(a->ch_count);
 409
 410     a->data= av_mallocz_array(countb, a->ch_count);
 411     if(!a->data)
 412         return AVERROR(ENOMEM);
 413     for(i=0; i<a->ch_count; i++){
 414         a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
 415         if(a->count && a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
 416     }
 417     if(a->count && !a->planar) memcpy(a->ch[0], old.ch[0], a->count*a->ch_count*a->bps);
 418     av_freep(&old.data);
 419     a->count= count;
 420
 421     return 1;
 422 }
 423
 424 static void copy(AudioData *out, AudioData *in,
 425                  int count){
 426     av_assert0(out->planar == in->planar);
 427     av_assert0(out->bps == in->bps);
 428     av_assert0(out->ch_count == in->ch_count);
 429     if(out->planar){
 430         int ch;
 431         for(ch=0; ch<out->ch_count; ch++)
 432             memcpy(out->ch[ch], in->ch[ch], count*out->bps);
 433     }else
 434         memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
 435 }
 436
 437 static void fill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 438     int i;
 439     if(!in_arg){
 440         memset(out->ch, 0, sizeof(out->ch));
 441     }else if(out->planar){
 442         for(i=0; i<out->ch_count; i++)
 443             out->ch[i]= in_arg[i];
 444     }else{
 445         for(i=0; i<out->ch_count; i++)
 446             out->ch[i]= in_arg[0] + i*out->bps;
 447     }
 448 }
 449
 450 static void reversefill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 451     int i;
 452     if(out->planar){
 453         for(i=0; i<out->ch_count; i++)
 454             in_arg[i]= out->ch[i];
 455     }else{
 456         in_arg[0]= out->ch[0];
 457     }
 458 }
 459
 460 /**
 461  *
 462  * out may be equal in.
 463  */
 464 static void buf_set(AudioData *out, AudioData *in, int count){
 465     int ch;
 466     if(in->planar){
 467         for(ch=0; ch<out->ch_count; ch++)
 468             out->ch[ch]= in->ch[ch] + count*out->bps;
 469     }else{
 470         for(ch=out->ch_count-1; ch>=0; ch--)
 471             out->ch[ch]= in->ch[0] + (ch + count*out->ch_count) * out->bps;
 472     }
 473 }
 474
 475 /**
 476  *
 477  * @return number of samples output per channel
 478  */
 479 static int resample(SwrContext *s, AudioData *out_param, int out_count,
 480                              const AudioData * in_param, int in_count){
 481     AudioData in, out, tmp;
 482     int ret_sum=0;
 483     int border=0;
 484     int padless = ARCH_X86 && s->engine == SWR_ENGINE_SWR ? 7 : 0;
 485
 486     av_assert1(s->in_buffer.ch_count == in_param->ch_count);
 487     av_assert1(s->in_buffer.planar   == in_param->planar);
 488     av_assert1(s->in_buffer.fmt      == in_param->fmt);
 489
 490     tmp=out=*out_param;
 491     in =  *in_param;
 492
 493     border = s->resampler->invert_initial_buffer(s->resample, &s->in_buffer,
 494                  &in, in_count, &s->in_buffer_index, &s->in_buffer_count);
 495     if (border == INT_MAX) {
 496         return 0;
 497     } else if (border < 0) {
 498         return border;
 499     } else if (border) {
 500         buf_set(&in, &in, border);
 501         in_count -= border;
 502         s->resample_in_constraint = 0;
 503     }
 504
 505     do{
 506         int ret, size, consumed;
 507         if(!s->resample_in_constraint && s->in_buffer_count){
 508             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 509             ret= s->resampler->multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
 510             out_count -= ret;
 511             ret_sum += ret;
 512             buf_set(&out, &out, ret);
 513             s->in_buffer_count -= consumed;
 514             s->in_buffer_index += consumed;
 515
 516             if(!in_count)
 517                 break;
 518             if(s->in_buffer_count <= border){
 519                 buf_set(&in, &in, -s->in_buffer_count);
 520                 in_count += s->in_buffer_count;
 521                 s->in_buffer_count=0;
 522                 s->in_buffer_index=0;
 523                 border = 0;
 524             }
 525         }
 526
 527         if((s->flushed || in_count > padless) && !s->in_buffer_count){
 528             s->in_buffer_index=0;
 529             ret= s->resampler->multiple_resample(s->resample, &out, out_count, &in, FFMAX(in_count-padless, 0), &consumed);
 530             out_count -= ret;
 531             ret_sum += ret;
 532             buf_set(&out, &out, ret);
 533             in_count -= consumed;
 534             buf_set(&in, &in, consumed);
 535         }
 536
 537         //TODO is this check sane considering the advanced copy avoidance below
 538         size= s->in_buffer_index + s->in_buffer_count + in_count;
 539         if(   size > s->in_buffer.count
 540            && s->in_buffer_count + in_count <= s->in_buffer_index){
 541             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 542             copy(&s->in_buffer, &tmp, s->in_buffer_count);
 543             s->in_buffer_index=0;
 544         }else
 545             if((ret=swri_realloc_audio(&s->in_buffer, size)) < 0)
 546                 return ret;
 547
 548         if(in_count){
 549             int count= in_count;
 550             if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;
 551
 552             buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 553             copy(&tmp, &in, /*in_*/count);
 554             s->in_buffer_count += count;
 555             in_count -= count;
 556             border += count;
 557             buf_set(&in, &in, count);
 558             s->resample_in_constraint= 0;
 559             if(s->in_buffer_count != count || in_count)
 560                 continue;
 561             if (padless) {
 562                 padless = 0;
 563                 continue;
 564             }
 565         }
 566         break;
 567     }while(1);
 568
 569     s->resample_in_constraint= !!out_count;
 570
 571     return ret_sum;
 572 }
 573
 574 static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_count,
 575                                                       AudioData *in , int  in_count){
 576     AudioData *postin, *midbuf, *preout;
 577     int ret/*, in_max*/;
 578     AudioData preout_tmp, midbuf_tmp;
 579
 580     if(s->full_convert){
 581         av_assert0(!s->resample);
 582         swri_audio_convert(s->full_convert, out, in, in_count);
 583         return out_count;
 584     }
 585
 586 //     in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
 587 //     in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);
 588
 589     if((ret=swri_realloc_audio(&s->postin, in_count))<0)
 590         return ret;
 591     if(s->resample_first){
 592         av_assert0(s->midbuf.ch_count == s->used_ch_count);
 593         if((ret=swri_realloc_audio(&s->midbuf, out_count))<0)
 594             return ret;
 595     }else{
 596         av_assert0(s->midbuf.ch_count ==  s->out.ch_count);
 597         if((ret=swri_realloc_audio(&s->midbuf,  in_count))<0)
 598             return ret;
 599     }
 600     if((ret=swri_realloc_audio(&s->preout, out_count))<0)
 601         return ret;
 602
 603     postin= &s->postin;
 604
 605     midbuf_tmp= s->midbuf;
 606     midbuf= &midbuf_tmp;
 607     preout_tmp= s->preout;
 608     preout= &preout_tmp;
 609
 610     if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar && !s->channel_map)
 611         postin= in;
 612
 613     if(s->resample_first ? !s->resample : !s->rematrix)
 614         midbuf= postin;
 615
 616     if(s->resample_first ? !s->rematrix : !s->resample)
 617         preout= midbuf;
 618
 619     if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar
 620        && !(s->out_sample_fmt==AV_SAMPLE_FMT_S32P && (s->dither.output_sample_bits&31))){
 621         if(preout==in){
 622             out_count= FFMIN(out_count, in_count); //TODO check at the end if this is needed or redundant
 623             av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
 624             copy(out, in, out_count);
 625             return out_count;
 626         }
 627         else if(preout==postin) preout= midbuf= postin= out;
 628         else if(preout==midbuf) preout= midbuf= out;
 629         else                    preout= out;
 630     }
 631
 632     if(in != postin){
 633         swri_audio_convert(s->in_convert, postin, in, in_count);
 634     }
 635
 636     if(s->resample_first){
 637         if(postin != midbuf)
 638             out_count= resample(s, midbuf, out_count, postin, in_count);
 639         if(midbuf != preout)
 640             swri_rematrix(s, preout, midbuf, out_count, preout==out);
 641     }else{
 642         if(postin != midbuf)
 643             swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
 644         if(midbuf != preout)
 645             out_count= resample(s, preout, out_count, midbuf, in_count);
 646     }
 647
 648     if(preout != out && out_count){
 649         AudioData *conv_src = preout;
 650         if(s->dither.method){
 651             int ch;
 652             int dither_count= FFMAX(out_count, 1<<16);
 653
 654             if (preout == in) {
 655                 conv_src = &s->dither.temp;
 656                 if((ret=swri_realloc_audio(&s->dither.temp, dither_count))<0)
 657                     return ret;
 658             }
 659
 660             if((ret=swri_realloc_audio(&s->dither.noise, dither_count))<0)
 661                 return ret;
 662             if(ret)
 663                 for(ch=0; ch<s->dither.noise.ch_count; ch++)
 664                     if((ret=swri_get_dither(s, s->dither.noise.ch[ch], s->dither.noise.count, (12345678913579ULL*ch + 3141592) % 2718281828U, s->dither.noise.fmt))<0)
 665                         return ret;
 666             av_assert0(s->dither.noise.ch_count == preout->ch_count);
 667
 668             if(s->dither.noise_pos + out_count > s->dither.noise.count)
 669                 s->dither.noise_pos = 0;
 670
 671             if (s->dither.method < SWR_DITHER_NS){
 672                 if (s->mix_2_1_simd) {
 673                     int len1= out_count&~15;
 674                     int off = len1 * preout->bps;
 675
 676                     if(len1)
 677                         for(ch=0; ch<preout->ch_count; ch++)
 678                             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);
 679                     if(out_count != len1)
 680                         for(ch=0; ch<preout->ch_count; ch++)
 681                             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);
 682                 } else {
 683                     for(ch=0; ch<preout->ch_count; ch++)
 684                         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);
 685                 }
 686             } else {
 687                 switch(s->int_sample_fmt) {
 688                 case AV_SAMPLE_FMT_S16P :swri_noise_shaping_int16(s, conv_src, preout, &s->dither.noise, out_count); break;
 689                 case AV_SAMPLE_FMT_S32P :swri_noise_shaping_int32(s, conv_src, preout, &s->dither.noise, out_count); break;
 690                 case AV_SAMPLE_FMT_FLTP :swri_noise_shaping_float(s, conv_src, preout, &s->dither.noise, out_count); break;
 691                 case AV_SAMPLE_FMT_DBLP :swri_noise_shaping_double(s,conv_src, preout, &s->dither.noise, out_count); break;
 692                 }
 693             }
 694             s->dither.noise_pos += out_count;
 695         }
 696 //FIXME packed doesn't need more than 1 chan here!
 697         swri_audio_convert(s->out_convert, out, conv_src, out_count);
 698     }
 699     return out_count;
 700 }
 701
 702 int swr_is_initialized(struct SwrContext *s) {
 703     return !!s->in_buffer.ch_count;
 704 }
 705
 706 int attribute_align_arg swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
 707                                                     const uint8_t *in_arg [SWR_CH_MAX], int  in_count){
 708     AudioData * in= &s->in;
 709     AudioData *out= &s->out;
 710     int av_unused max_output;
 711
 712     if (!swr_is_initialized(s)) {
 713         av_log(s, AV_LOG_ERROR, "Context has not been initialized\n");
 714         return AVERROR(EINVAL);
 715     }
 716 #if defined(ASSERT_LEVEL) && ASSERT_LEVEL >1
 717     max_output = swr_get_out_samples(s, in_count);
 718 #endif
 719
 720     while(s->drop_output > 0){
 721         int ret;
 722         uint8_t *tmp_arg[SWR_CH_MAX];
 723 #define MAX_DROP_STEP 16384
 724         if((ret=swri_realloc_audio(&s->drop_temp, FFMIN(s->drop_output, MAX_DROP_STEP)))<0)
 725             return ret;
 726
 727         reversefill_audiodata(&s->drop_temp, tmp_arg);
 728         s->drop_output *= -1; //FIXME find a less hackish solution
 729         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
 730         s->drop_output *= -1;
 731         in_count = 0;
 732         if(ret>0) {
 733             s->drop_output -= ret;
 734             if (!s->drop_output && !out_arg)
 735                 return 0;
 736             continue;
 737         }
 738
 739         av_assert0(s->drop_output);
 740         return 0;
 741     }
 742
 743     if(!in_arg){
 744         if(s->resample){
 745             if (!s->flushed)
 746                 s->resampler->flush(s);
 747             s->resample_in_constraint = 0;
 748             s->flushed = 1;
 749         }else if(!s->in_buffer_count){
 750             return 0;
 751         }
 752     }else
 753         fill_audiodata(in ,  (void*)in_arg);
 754
 755     fill_audiodata(out, out_arg);
 756
 757     if(s->resample){
 758         int ret = swr_convert_internal(s, out, out_count, in, in_count);
 759         if(ret>0 && !s->drop_output)
 760             s->outpts += ret * (int64_t)s->in_sample_rate;
 761
 762         av_assert2(max_output < 0 || ret < 0 || ret <= max_output);
 763
 764         return ret;
 765     }else{
 766         AudioData tmp= *in;
 767         int ret2=0;
 768         int ret, size;
 769         size = FFMIN(out_count, s->in_buffer_count);
 770         if(size){
 771             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 772             ret= swr_convert_internal(s, out, size, &tmp, size);
 773             if(ret<0)
 774                 return ret;
 775             ret2= ret;
 776             s->in_buffer_count -= ret;
 777             s->in_buffer_index += ret;
 778             buf_set(out, out, ret);
 779             out_count -= ret;
 780             if(!s->in_buffer_count)
 781                 s->in_buffer_index = 0;
 782         }
 783
 784         if(in_count){
 785             size= s->in_buffer_index + s->in_buffer_count + in_count - out_count;
 786
 787             if(in_count > out_count) { //FIXME move after swr_convert_internal
 788                 if(   size > s->in_buffer.count
 789                 && s->in_buffer_count + in_count - out_count <= s->in_buffer_index){
 790                     buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 791                     copy(&s->in_buffer, &tmp, s->in_buffer_count);
 792                     s->in_buffer_index=0;
 793                 }else
 794                     if((ret=swri_realloc_audio(&s->in_buffer, size)) < 0)
 795                         return ret;
 796             }
 797
 798             if(out_count){
 799                 size = FFMIN(in_count, out_count);
 800                 ret= swr_convert_internal(s, out, size, in, size);
 801                 if(ret<0)
 802                     return ret;
 803                 buf_set(in, in, ret);
 804                 in_count -= ret;
 805                 ret2 += ret;
 806             }
 807             if(in_count){
 808                 buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 809                 copy(&tmp, in, in_count);
 810                 s->in_buffer_count += in_count;
 811             }
 812         }
 813         if(ret2>0 && !s->drop_output)
 814             s->outpts += ret2 * (int64_t)s->in_sample_rate;
 815         av_assert2(max_output < 0 || ret2 < 0 || ret2 <= max_output);
 816         return ret2;
 817     }
 818 }
 819
 820 int swr_drop_output(struct SwrContext *s, int count){
 821     const uint8_t *tmp_arg[SWR_CH_MAX];
 822     s->drop_output += count;
 823
 824     if(s->drop_output <= 0)
 825         return 0;
 826
 827     av_log(s, AV_LOG_VERBOSE, "discarding %d audio samples\n", count);
 828     return swr_convert(s, NULL, s->drop_output, tmp_arg, 0);
 829 }
 830
 831 int swr_inject_silence(struct SwrContext *s, int count){
 832     int ret, i;
 833     uint8_t *tmp_arg[SWR_CH_MAX];
 834
 835     if(count <= 0)
 836         return 0;
 837
 838 #define MAX_SILENCE_STEP 16384
 839     while (count > MAX_SILENCE_STEP) {
 840         if ((ret = swr_inject_silence(s, MAX_SILENCE_STEP)) < 0)
 841             return ret;
 842         count -= MAX_SILENCE_STEP;
 843     }
 844
 845     if((ret=swri_realloc_audio(&s->silence, count))<0)
 846         return ret;
 847
 848     if(s->silence.planar) for(i=0; i<s->silence.ch_count; i++) {
 849         memset(s->silence.ch[i], s->silence.bps==1 ? 0x80 : 0, count*s->silence.bps);
 850     } else
 851         memset(s->silence.ch[0], s->silence.bps==1 ? 0x80 : 0, count*s->silence.bps*s->silence.ch_count);
 852
 853     reversefill_audiodata(&s->silence, tmp_arg);
 854     av_log(s, AV_LOG_VERBOSE, "adding %d audio samples of silence\n", count);
 855     ret = swr_convert(s, NULL, 0, (const uint8_t**)tmp_arg, count);
 856     return ret;
 857 }
 858
 859 int64_t swr_get_delay(struct SwrContext *s, int64_t base){
 860     if (s->resampler && s->resample){
 861         return s->resampler->get_delay(s, base);
 862     }else{
 863         return (s->in_buffer_count*base + (s->in_sample_rate>>1))/ s->in_sample_rate;
 864     }
 865 }
 866
 867 int swr_get_out_samples(struct SwrContext *s, int in_samples)
 868 {
 869     int64_t out_samples;
 870
 871     if (in_samples < 0)
 872         return AVERROR(EINVAL);
 873
 874     if (s->resampler && s->resample) {
 875         if (!s->resampler->get_out_samples)
 876             return AVERROR(ENOSYS);
 877         out_samples = s->resampler->get_out_samples(s, in_samples);
 878     } else {
 879         out_samples = s->in_buffer_count + in_samples;
 880         av_assert0(s->out_sample_rate == s->in_sample_rate);
 881     }
 882
 883     if (out_samples > INT_MAX)
 884         return AVERROR(EINVAL);
 885
 886     return out_samples;
 887 }
 888
 889 int swr_set_compensation(struct SwrContext *s, int sample_delta, int compensation_distance){
 890     int ret;
 891
 892     if (!s || compensation_distance < 0)
 893         return AVERROR(EINVAL);
 894     if (!compensation_distance && sample_delta)
 895         return AVERROR(EINVAL);
 896     if (!s->resample) {
 897         s->flags |= SWR_FLAG_RESAMPLE;
 898         ret = swr_init(s);
 899         if (ret < 0)
 900             return ret;
 901     }
 902     if (!s->resampler->set_compensation){
 903         return AVERROR(EINVAL);
 904     }else{
 905         return s->resampler->set_compensation(s->resample, sample_delta, compensation_distance);
 906     }
 907 }
 908
 909 int64_t swr_next_pts(struct SwrContext *s, int64_t pts){
 910     if(pts == INT64_MIN)
 911         return s->outpts;
 912
 913     if (s->firstpts == AV_NOPTS_VALUE)
 914         s->outpts = s->firstpts = pts;
 915
 916     if(s->min_compensation >= FLT_MAX) {
 917         return (s->outpts = pts - swr_get_delay(s, s->in_sample_rate * (int64_t)s->out_sample_rate));
 918     } else {
 919         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;
 920         double fdelta = delta /(double)(s->in_sample_rate * (int64_t)s->out_sample_rate);
 921
 922         if(fabs(fdelta) > s->min_compensation) {
 923             if(s->outpts == s->firstpts || fabs(fdelta) > s->min_hard_compensation){
 924                 int ret;
 925                 if(delta > 0) ret = swr_inject_silence(s,  delta / s->out_sample_rate);
 926                 else          ret = swr_drop_output   (s, -delta / s-> in_sample_rate);
 927                 if(ret<0){
 928                     av_log(s, AV_LOG_ERROR, "Failed to compensate for timestamp delta of %f\n", fdelta);
 929                 }
 930             } else if(s->soft_compensation_duration && s->max_soft_compensation) {
 931                 int duration = s->out_sample_rate * s->soft_compensation_duration;
 932                 double max_soft_compensation = s->max_soft_compensation / (s->max_soft_compensation < 0 ? -s->in_sample_rate : 1);
 933                 int comp = av_clipf(fdelta, -max_soft_compensation, max_soft_compensation) * duration ;
 934                 av_log(s, AV_LOG_VERBOSE, "compensating audio timestamp drift:%f compensation:%d in:%d\n", fdelta, comp, duration);
 935                 swr_set_compensation(s, comp, duration);
 936             }
 937         }
 938
 939         return s->outpts;
 940     }
 941 }