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, "tsf", AV_SAMPLE_FMT_NONE,   0) < 0)
  88         goto fail;
  89
  90     if (av_opt_set_int(s, "ich", av_get_channel_layout_nb_channels(s-> user_in_ch_layout), 0) < 0)
  91         goto fail;
  92
  93     if (av_opt_set_int(s, "och", av_get_channel_layout_nb_channels(s->user_out_ch_layout), 0) < 0)
  94         goto fail;
  95
  96     av_opt_set_int(s, "uch", 0, 0);
  97     return s;
  98 fail:
  99     av_log(s, AV_LOG_ERROR, "Failed to set option\n");
 100     swr_free(&s);
 101     return NULL;
 102 }
 103
 104 static void set_audiodata_fmt(AudioData *a, enum AVSampleFormat fmt){
 105     a->fmt   = fmt;
 106     a->bps   = av_get_bytes_per_sample(fmt);
 107     a->planar= av_sample_fmt_is_planar(fmt);
 108     if (a->ch_count == 1)
 109         a->planar = 1;
 110 }
 111
 112 static void free_temp(AudioData *a){
 113     av_free(a->data);
 114     memset(a, 0, sizeof(*a));
 115 }
 116
 117 static void clear_context(SwrContext *s){
 118     s->in_buffer_index= 0;
 119     s->in_buffer_count= 0;
 120     s->resample_in_constraint= 0;
 121     memset(s->in.ch, 0, sizeof(s->in.ch));
 122     memset(s->out.ch, 0, sizeof(s->out.ch));
 123     free_temp(&s->postin);
 124     free_temp(&s->midbuf);
 125     free_temp(&s->preout);
 126     free_temp(&s->in_buffer);
 127     free_temp(&s->silence);
 128     free_temp(&s->drop_temp);
 129     free_temp(&s->dither.noise);
 130     free_temp(&s->dither.temp);
 131     swri_audio_convert_free(&s-> in_convert);
 132     swri_audio_convert_free(&s->out_convert);
 133     swri_audio_convert_free(&s->full_convert);
 134     swri_rematrix_free(s);
 135
 136     s->delayed_samples_fixup = 0;
 137     s->flushed = 0;
 138 }
 139
 140 av_cold void swr_free(SwrContext **ss){
 141     SwrContext *s= *ss;
 142     if(s){
 143         clear_context(s);
 144         if (s->resampler)
 145             s->resampler->free(&s->resample);
 146     }
 147
 148     av_freep(ss);
 149 }
 150
 151 av_cold void swr_close(SwrContext *s){
 152     clear_context(s);
 153 }
 154
 155 av_cold int swr_init(struct SwrContext *s){
 156     int ret;
 157     char l1[1024], l2[1024];
 158
 159     clear_context(s);
 160
 161     if(s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
 162         av_log(s, AV_LOG_ERROR, "Requested input sample format %d is invalid\n", s->in_sample_fmt);
 163         return AVERROR(EINVAL);
 164     }
 165     if(s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
 166         av_log(s, AV_LOG_ERROR, "Requested output sample format %d is invalid\n", s->out_sample_fmt);
 167         return AVERROR(EINVAL);
 168     }
 169
 170     s->out.ch_count  = s-> user_out_ch_count;
 171     s-> in.ch_count  = s->  user_in_ch_count;
 172     s->used_ch_count = s->user_used_ch_count;
 173
 174     s-> in_ch_layout = s-> user_in_ch_layout;
 175     s->out_ch_layout = s->user_out_ch_layout;
 176
 177     s->int_sample_fmt= s->user_int_sample_fmt;
 178
 179     s->dither.method = s->user_dither_method;
 180
 181     if(av_get_channel_layout_nb_channels(s-> in_ch_layout) > SWR_CH_MAX) {
 182         av_log(s, AV_LOG_WARNING, "Input channel layout 0x%"PRIx64" is invalid or unsupported.\n", s-> in_ch_layout);
 183         s->in_ch_layout = 0;
 184     }
 185
 186     if(av_get_channel_layout_nb_channels(s->out_ch_layout) > SWR_CH_MAX) {
 187         av_log(s, AV_LOG_WARNING, "Output channel layout 0x%"PRIx64" is invalid or unsupported.\n", s->out_ch_layout);
 188         s->out_ch_layout = 0;
 189     }
 190
 191     switch(s->engine){
 192 #if CONFIG_LIBSOXR
 193         case SWR_ENGINE_SOXR: s->resampler = &swri_soxr_resampler; break;
 194 #endif
 195         case SWR_ENGINE_SWR : s->resampler = &swri_resampler; break;
 196         default:
 197             av_log(s, AV_LOG_ERROR, "Requested resampling engine is unavailable\n");
 198             return AVERROR(EINVAL);
 199     }
 200
 201     if(!s->used_ch_count)
 202         s->used_ch_count= s->in.ch_count;
 203
 204     if(s->used_ch_count && s-> in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s-> in_ch_layout)){
 205         av_log(s, AV_LOG_WARNING, "Input channel layout has a different number of channels than the number of used channels, ignoring layout\n");
 206         s-> in_ch_layout= 0;
 207     }
 208
 209     if(!s-> in_ch_layout)
 210         s-> in_ch_layout= av_get_default_channel_layout(s->used_ch_count);
 211     if(!s->out_ch_layout)
 212         s->out_ch_layout= av_get_default_channel_layout(s->out.ch_count);
 213
 214     s->rematrix= s->out_ch_layout  !=s->in_ch_layout || s->rematrix_volume!=1.0 ||
 215                  s->rematrix_custom;
 216
 217     if(s->int_sample_fmt == AV_SAMPLE_FMT_NONE){
 218         if(   av_get_bytes_per_sample(s-> in_sample_fmt) <= 2
 219            && av_get_bytes_per_sample(s->out_sample_fmt) <= 2){
 220             s->int_sample_fmt= AV_SAMPLE_FMT_S16P;
 221         }else if(   av_get_bytes_per_sample(s-> in_sample_fmt) <= 2
 222            && !s->rematrix
 223            && s->out_sample_rate==s->in_sample_rate
 224            && !(s->flags & SWR_FLAG_RESAMPLE)){
 225             s->int_sample_fmt= AV_SAMPLE_FMT_S16P;
 226         }else if(   av_get_planar_sample_fmt(s-> in_sample_fmt) == AV_SAMPLE_FMT_S32P
 227                  && av_get_planar_sample_fmt(s->out_sample_fmt) == AV_SAMPLE_FMT_S32P
 228                  && !s->rematrix
 229                  && s->engine != SWR_ENGINE_SOXR){
 230             s->int_sample_fmt= AV_SAMPLE_FMT_S32P;
 231         }else if(av_get_bytes_per_sample(s->in_sample_fmt) <= 4){
 232             s->int_sample_fmt= AV_SAMPLE_FMT_FLTP;
 233         }else{
 234             s->int_sample_fmt= AV_SAMPLE_FMT_DBLP;
 235         }
 236     }
 237     av_log(s, AV_LOG_DEBUG, "Using %s internally between filters\n", av_get_sample_fmt_name(s->int_sample_fmt));
 238
 239     if(   s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 240         &&s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 241         &&s->int_sample_fmt != AV_SAMPLE_FMT_S64P
 242         &&s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
 243         &&s->int_sample_fmt != AV_SAMPLE_FMT_DBLP){
 244         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));
 245         return AVERROR(EINVAL);
 246     }
 247
 248     set_audiodata_fmt(&s-> in, s-> in_sample_fmt);
 249     set_audiodata_fmt(&s->out, s->out_sample_fmt);
 250
 251     if (s->firstpts_in_samples != AV_NOPTS_VALUE) {
 252         if (!s->async && s->min_compensation >= FLT_MAX/2)
 253             s->async = 1;
 254         s->firstpts =
 255         s->outpts   = s->firstpts_in_samples * s->out_sample_rate;
 256     } else
 257         s->firstpts = AV_NOPTS_VALUE;
 258
 259     if (s->async) {
 260         if (s->min_compensation >= FLT_MAX/2)
 261             s->min_compensation = 0.001;
 262         if (s->async > 1.0001) {
 263             s->max_soft_compensation = s->async / (double) s->in_sample_rate;
 264         }
 265     }
 266
 267     if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
 268         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);
 269         if (!s->resample) {
 270             av_log(s, AV_LOG_ERROR, "Failed to initialize resampler\n");
 271             return AVERROR(ENOMEM);
 272         }
 273     }else
 274         s->resampler->free(&s->resample);
 275     if(    s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 276         && s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 277         && s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
 278         && s->int_sample_fmt != AV_SAMPLE_FMT_DBLP
 279         && s->resample){
 280         av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16/s32/flt/dbl\n");
 281         ret = AVERROR(EINVAL);
 282         goto fail;
 283     }
 284
 285 #define RSC 1 //FIXME finetune
 286     if(!s-> in.ch_count)
 287         s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
 288     if(!s->used_ch_count)
 289         s->used_ch_count= s->in.ch_count;
 290     if(!s->out.ch_count)
 291         s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
 292
 293     if(!s-> in.ch_count){
 294         av_assert0(!s->in_ch_layout);
 295         av_log(s, AV_LOG_ERROR, "Input channel count and layout are unset\n");
 296         ret = AVERROR(EINVAL);
 297         goto fail;
 298     }
 299
 300     av_get_channel_layout_string(l1, sizeof(l1), s-> in.ch_count, s-> in_ch_layout);
 301     av_get_channel_layout_string(l2, sizeof(l2), s->out.ch_count, s->out_ch_layout);
 302     if (s->out_ch_layout && s->out.ch_count != av_get_channel_layout_nb_channels(s->out_ch_layout)) {
 303         av_log(s, AV_LOG_ERROR, "Output channel layout %s mismatches specified channel count %d\n", l2, s->out.ch_count);
 304         ret = AVERROR(EINVAL);
 305         goto fail;
 306     }
 307     if (s->in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s->in_ch_layout)) {
 308         av_log(s, AV_LOG_ERROR, "Input channel layout %s mismatches specified channel count %d\n", l1, s->used_ch_count);
 309         ret = AVERROR(EINVAL);
 310         goto fail;
 311     }
 312
 313     if ((!s->out_ch_layout || !s->in_ch_layout) && s->used_ch_count != s->out.ch_count && !s->rematrix_custom) {
 314         av_log(s, AV_LOG_ERROR, "Rematrix is needed between %s and %s "
 315                "but there is not enough information to do it\n", l1, l2);
 316         ret = AVERROR(EINVAL);
 317         goto fail;
 318     }
 319
 320 av_assert0(s->used_ch_count);
 321 av_assert0(s->out.ch_count);
 322     s->resample_first= RSC*s->out.ch_count/s->in.ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;
 323
 324     s->in_buffer= s->in;
 325     s->silence  = s->in;
 326     s->drop_temp= s->out;
 327
 328     if ((ret = swri_dither_init(s, s->out_sample_fmt, s->int_sample_fmt)) < 0)
 329         goto fail;
 330
 331     if(!s->resample && !s->rematrix && !s->channel_map && !s->dither.method){
 332         s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt,
 333                                                    s-> in_sample_fmt, s-> in.ch_count, NULL, 0);
 334         return 0;
 335     }
 336
 337     s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt,
 338                                              s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0);
 339     s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt,
 340                                              s->int_sample_fmt, s->out.ch_count, NULL, 0);
 341
 342     if (!s->in_convert || !s->out_convert) {
 343         ret = AVERROR(ENOMEM);
 344         goto fail;
 345     }
 346
 347     s->postin= s->in;
 348     s->preout= s->out;
 349     s->midbuf= s->in;
 350
 351     if(s->channel_map){
 352         s->postin.ch_count=
 353         s->midbuf.ch_count= s->used_ch_count;
 354         if(s->resample)
 355             s->in_buffer.ch_count= s->used_ch_count;
 356     }
 357     if(!s->resample_first){
 358         s->midbuf.ch_count= s->out.ch_count;
 359         if(s->resample)
 360             s->in_buffer.ch_count = s->out.ch_count;
 361     }
 362
 363     set_audiodata_fmt(&s->postin, s->int_sample_fmt);
 364     set_audiodata_fmt(&s->midbuf, s->int_sample_fmt);
 365     set_audiodata_fmt(&s->preout, s->int_sample_fmt);
 366
 367     if(s->resample){
 368         set_audiodata_fmt(&s->in_buffer, s->int_sample_fmt);
 369     }
 370
 371     av_assert0(!s->preout.count);
 372     s->dither.noise = s->preout;
 373     s->dither.temp  = s->preout;
 374     if (s->dither.method > SWR_DITHER_NS) {
 375         s->dither.noise.bps = 4;
 376         s->dither.noise.fmt = AV_SAMPLE_FMT_FLTP;
 377         s->dither.noise_scale = 1;
 378     }
 379
 380     if(s->rematrix || s->dither.method) {
 381         ret = swri_rematrix_init(s);
 382         if (ret < 0)
 383             goto fail;
 384     }
 385
 386     return 0;
 387 fail:
 388     swr_close(s);
 389     return ret;
 390
 391 }
 392
 393 int swri_realloc_audio(AudioData *a, int count){
 394     int i, countb;
 395     AudioData old;
 396
 397     if(count < 0 || count > INT_MAX/2/a->bps/a->ch_count)
 398         return AVERROR(EINVAL);
 399
 400     if(a->count >= count)
 401         return 0;
 402
 403     count*=2;
 404
 405     countb= FFALIGN(count*a->bps, ALIGN);
 406     old= *a;
 407
 408     av_assert0(a->bps);
 409     av_assert0(a->ch_count);
 410
 411     a->data= av_mallocz_array(countb, a->ch_count);
 412     if(!a->data)
 413         return AVERROR(ENOMEM);
 414     for(i=0; i<a->ch_count; i++){
 415         a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
 416         if(a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
 417     }
 418     if(!a->planar) memcpy(a->ch[0], old.ch[0], a->count*a->ch_count*a->bps);
 419     av_freep(&old.data);
 420     a->count= count;
 421
 422     return 1;
 423 }
 424
 425 static void copy(AudioData *out, AudioData *in,
 426                  int count){
 427     av_assert0(out->planar == in->planar);
 428     av_assert0(out->bps == in->bps);
 429     av_assert0(out->ch_count == in->ch_count);
 430     if(out->planar){
 431         int ch;
 432         for(ch=0; ch<out->ch_count; ch++)
 433             memcpy(out->ch[ch], in->ch[ch], count*out->bps);
 434     }else
 435         memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
 436 }
 437
 438 static void fill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 439     int i;
 440     if(!in_arg){
 441         memset(out->ch, 0, sizeof(out->ch));
 442     }else if(out->planar){
 443         for(i=0; i<out->ch_count; i++)
 444             out->ch[i]= in_arg[i];
 445     }else{
 446         for(i=0; i<out->ch_count; i++)
 447             out->ch[i]= in_arg[0] + i*out->bps;
 448     }
 449 }
 450
 451 static void reversefill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 452     int i;
 453     if(out->planar){
 454         for(i=0; i<out->ch_count; i++)
 455             in_arg[i]= out->ch[i];
 456     }else{
 457         in_arg[0]= out->ch[0];
 458     }
 459 }
 460
 461 /**
 462  *
 463  * out may be equal in.
 464  */
 465 static void buf_set(AudioData *out, AudioData *in, int count){
 466     int ch;
 467     if(in->planar){
 468         for(ch=0; ch<out->ch_count; ch++)
 469             out->ch[ch]= in->ch[ch] + count*out->bps;
 470     }else{
 471         for(ch=out->ch_count-1; ch>=0; ch--)
 472             out->ch[ch]= in->ch[0] + (ch + count*out->ch_count) * out->bps;
 473     }
 474 }
 475
 476 /**
 477  *
 478  * @return number of samples output per channel
 479  */
 480 static int resample(SwrContext *s, AudioData *out_param, int out_count,
 481                              const AudioData * in_param, int in_count){
 482     AudioData in, out, tmp;
 483     int ret_sum=0;
 484     int border=0;
 485     int padless = ARCH_X86 && s->engine == SWR_ENGINE_SWR ? 7 : 0;
 486
 487     av_assert1(s->in_buffer.ch_count == in_param->ch_count);
 488     av_assert1(s->in_buffer.planar   == in_param->planar);
 489     av_assert1(s->in_buffer.fmt      == in_param->fmt);
 490
 491     tmp=out=*out_param;
 492     in =  *in_param;
 493
 494     border = s->resampler->invert_initial_buffer(s->resample, &s->in_buffer,
 495                  &in, in_count, &s->in_buffer_index, &s->in_buffer_count);
 496     if (border == INT_MAX) {
 497         return 0;
 498     } else if (border < 0) {
 499         return border;
 500     } else if (border) {
 501         buf_set(&in, &in, border);
 502         in_count -= border;
 503         s->resample_in_constraint = 0;
 504     }
 505
 506     do{
 507         int ret, size, consumed;
 508         if(!s->resample_in_constraint && s->in_buffer_count){
 509             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 510             ret= s->resampler->multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
 511             out_count -= ret;
 512             ret_sum += ret;
 513             buf_set(&out, &out, ret);
 514             s->in_buffer_count -= consumed;
 515             s->in_buffer_index += consumed;
 516
 517             if(!in_count)
 518                 break;
 519             if(s->in_buffer_count <= border){
 520                 buf_set(&in, &in, -s->in_buffer_count);
 521                 in_count += s->in_buffer_count;
 522                 s->in_buffer_count=0;
 523                 s->in_buffer_index=0;
 524                 border = 0;
 525             }
 526         }
 527
 528         if((s->flushed || in_count > padless) && !s->in_buffer_count){
 529             s->in_buffer_index=0;
 530             ret= s->resampler->multiple_resample(s->resample, &out, out_count, &in, FFMAX(in_count-padless, 0), &consumed);
 531             out_count -= ret;
 532             ret_sum += ret;
 533             buf_set(&out, &out, ret);
 534             in_count -= consumed;
 535             buf_set(&in, &in, consumed);
 536         }
 537
 538         //TODO is this check sane considering the advanced copy avoidance below
 539         size= s->in_buffer_index + s->in_buffer_count + in_count;
 540         if(   size > s->in_buffer.count
 541            && s->in_buffer_count + in_count <= s->in_buffer_index){
 542             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 543             copy(&s->in_buffer, &tmp, s->in_buffer_count);
 544             s->in_buffer_index=0;
 545         }else
 546             if((ret=swri_realloc_audio(&s->in_buffer, size)) < 0)
 547                 return ret;
 548
 549         if(in_count){
 550             int count= in_count;
 551             if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;
 552
 553             buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 554             copy(&tmp, &in, /*in_*/count);
 555             s->in_buffer_count += count;
 556             in_count -= count;
 557             border += count;
 558             buf_set(&in, &in, count);
 559             s->resample_in_constraint= 0;
 560             if(s->in_buffer_count != count || in_count)
 561                 continue;
 562             if (padless) {
 563                 padless = 0;
 564                 continue;
 565             }
 566         }
 567         break;
 568     }while(1);
 569
 570     s->resample_in_constraint= !!out_count;
 571
 572     return ret_sum;
 573 }
 574
 575 static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_count,
 576                                                       AudioData *in , int  in_count){
 577     AudioData *postin, *midbuf, *preout;
 578     int ret/*, in_max*/;
 579     AudioData preout_tmp, midbuf_tmp;
 580
 581     if(s->full_convert){
 582         av_assert0(!s->resample);
 583         swri_audio_convert(s->full_convert, out, in, in_count);
 584         return out_count;
 585     }
 586
 587 //     in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
 588 //     in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);
 589
 590     if((ret=swri_realloc_audio(&s->postin, in_count))<0)
 591         return ret;
 592     if(s->resample_first){
 593         av_assert0(s->midbuf.ch_count == s->used_ch_count);
 594         if((ret=swri_realloc_audio(&s->midbuf, out_count))<0)
 595             return ret;
 596     }else{
 597         av_assert0(s->midbuf.ch_count ==  s->out.ch_count);
 598         if((ret=swri_realloc_audio(&s->midbuf,  in_count))<0)
 599             return ret;
 600     }
 601     if((ret=swri_realloc_audio(&s->preout, out_count))<0)
 602         return ret;
 603
 604     postin= &s->postin;
 605
 606     midbuf_tmp= s->midbuf;
 607     midbuf= &midbuf_tmp;
 608     preout_tmp= s->preout;
 609     preout= &preout_tmp;
 610
 611     if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar && !s->channel_map)
 612         postin= in;
 613
 614     if(s->resample_first ? !s->resample : !s->rematrix)
 615         midbuf= postin;
 616
 617     if(s->resample_first ? !s->rematrix : !s->resample)
 618         preout= midbuf;
 619
 620     if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar
 621        && !(s->out_sample_fmt==AV_SAMPLE_FMT_S32P && (s->dither.output_sample_bits&31))){
 622         if(preout==in){
 623             out_count= FFMIN(out_count, in_count); //TODO check at the end if this is needed or redundant
 624             av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
 625             copy(out, in, out_count);
 626             return out_count;
 627         }
 628         else if(preout==postin) preout= midbuf= postin= out;
 629         else if(preout==midbuf) preout= midbuf= out;
 630         else                    preout= out;
 631     }
 632
 633     if(in != postin){
 634         swri_audio_convert(s->in_convert, postin, in, in_count);
 635     }
 636
 637     if(s->resample_first){
 638         if(postin != midbuf)
 639             out_count= resample(s, midbuf, out_count, postin, in_count);
 640         if(midbuf != preout)
 641             swri_rematrix(s, preout, midbuf, out_count, preout==out);
 642     }else{
 643         if(postin != midbuf)
 644             swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
 645         if(midbuf != preout)
 646             out_count= resample(s, preout, out_count, midbuf, in_count);
 647     }
 648
 649     if(preout != out && out_count){
 650         AudioData *conv_src = preout;
 651         if(s->dither.method){
 652             int ch;
 653             int dither_count= FFMAX(out_count, 1<<16);
 654
 655             if (preout == in) {
 656                 conv_src = &s->dither.temp;
 657                 if((ret=swri_realloc_audio(&s->dither.temp, dither_count))<0)
 658                     return ret;
 659             }
 660
 661             if((ret=swri_realloc_audio(&s->dither.noise, dither_count))<0)
 662                 return ret;
 663             if(ret)
 664                 for(ch=0; ch<s->dither.noise.ch_count; ch++)
 665                     if((ret=swri_get_dither(s, s->dither.noise.ch[ch], s->dither.noise.count, (12345678913579ULL*ch + 3141592) % 2718281828U, s->dither.noise.fmt))<0)
 666                         return ret;
 667             av_assert0(s->dither.noise.ch_count == preout->ch_count);
 668
 669             if(s->dither.noise_pos + out_count > s->dither.noise.count)
 670                 s->dither.noise_pos = 0;
 671
 672             if (s->dither.method < SWR_DITHER_NS){
 673                 if (s->mix_2_1_simd) {
 674                     int len1= out_count&~15;
 675                     int off = len1 * preout->bps;
 676
 677                     if(len1)
 678                         for(ch=0; ch<preout->ch_count; ch++)
 679                             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);
 680                     if(out_count != len1)
 681                         for(ch=0; ch<preout->ch_count; ch++)
 682                             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);
 683                 } else {
 684                     for(ch=0; ch<preout->ch_count; ch++)
 685                         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);
 686                 }
 687             } else {
 688                 switch(s->int_sample_fmt) {
 689                 case AV_SAMPLE_FMT_S16P :swri_noise_shaping_int16(s, conv_src, preout, &s->dither.noise, out_count); break;
 690                 case AV_SAMPLE_FMT_S32P :swri_noise_shaping_int32(s, conv_src, preout, &s->dither.noise, out_count); break;
 691                 case AV_SAMPLE_FMT_FLTP :swri_noise_shaping_float(s, conv_src, preout, &s->dither.noise, out_count); break;
 692                 case AV_SAMPLE_FMT_DBLP :swri_noise_shaping_double(s,conv_src, preout, &s->dither.noise, out_count); break;
 693                 }
 694             }
 695             s->dither.noise_pos += out_count;
 696         }
 697 //FIXME packed doesn't need more than 1 chan here!
 698         swri_audio_convert(s->out_convert, out, conv_src, out_count);
 699     }
 700     return out_count;
 701 }
 702
 703 int swr_is_initialized(struct SwrContext *s) {
 704     return !!s->in_buffer.ch_count;
 705 }
 706
 707 int attribute_align_arg swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
 708                                                     const uint8_t *in_arg [SWR_CH_MAX], int  in_count){
 709     AudioData * in= &s->in;
 710     AudioData *out= &s->out;
 711     int av_unused max_output;
 712
 713     if (!swr_is_initialized(s)) {
 714         av_log(s, AV_LOG_ERROR, "Context has not been initialized\n");
 715         return AVERROR(EINVAL);
 716     }
 717 #if defined(ASSERT_LEVEL) && ASSERT_LEVEL >1
 718     max_output = swr_get_out_samples(s, in_count);
 719 #endif
 720
 721     while(s->drop_output > 0){
 722         int ret;
 723         uint8_t *tmp_arg[SWR_CH_MAX];
 724 #define MAX_DROP_STEP 16384
 725         if((ret=swri_realloc_audio(&s->drop_temp, FFMIN(s->drop_output, MAX_DROP_STEP)))<0)
 726             return ret;
 727
 728         reversefill_audiodata(&s->drop_temp, tmp_arg);
 729         s->drop_output *= -1; //FIXME find a less hackish solution
 730         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
 731         s->drop_output *= -1;
 732         in_count = 0;
 733         if(ret>0) {
 734             s->drop_output -= ret;
 735             if (!s->drop_output && !out_arg)
 736                 return 0;
 737             continue;
 738         }
 739
 740         av_assert0(s->drop_output);
 741         return 0;
 742     }
 743
 744     if(!in_arg){
 745         if(s->resample){
 746             if (!s->flushed)
 747                 s->resampler->flush(s);
 748             s->resample_in_constraint = 0;
 749             s->flushed = 1;
 750         }else if(!s->in_buffer_count){
 751             return 0;
 752         }
 753     }else
 754         fill_audiodata(in ,  (void*)in_arg);
 755
 756     fill_audiodata(out, out_arg);
 757
 758     if(s->resample){
 759         int ret = swr_convert_internal(s, out, out_count, in, in_count);
 760         if(ret>0 && !s->drop_output)
 761             s->outpts += ret * (int64_t)s->in_sample_rate;
 762
 763         av_assert2(max_output < 0 || ret < 0 || ret <= max_output);
 764
 765         return ret;
 766     }else{
 767         AudioData tmp= *in;
 768         int ret2=0;
 769         int ret, size;
 770         size = FFMIN(out_count, s->in_buffer_count);
 771         if(size){
 772             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 773             ret= swr_convert_internal(s, out, size, &tmp, size);
 774             if(ret<0)
 775                 return ret;
 776             ret2= ret;
 777             s->in_buffer_count -= ret;
 778             s->in_buffer_index += ret;
 779             buf_set(out, out, ret);
 780             out_count -= ret;
 781             if(!s->in_buffer_count)
 782                 s->in_buffer_index = 0;
 783         }
 784
 785         if(in_count){
 786             size= s->in_buffer_index + s->in_buffer_count + in_count - out_count;
 787
 788             if(in_count > out_count) { //FIXME move after swr_convert_internal
 789                 if(   size > s->in_buffer.count
 790                 && s->in_buffer_count + in_count - out_count <= s->in_buffer_index){
 791                     buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 792                     copy(&s->in_buffer, &tmp, s->in_buffer_count);
 793                     s->in_buffer_index=0;
 794                 }else
 795                     if((ret=swri_realloc_audio(&s->in_buffer, size)) < 0)
 796                         return ret;
 797             }
 798
 799             if(out_count){
 800                 size = FFMIN(in_count, out_count);
 801                 ret= swr_convert_internal(s, out, size, in, size);
 802                 if(ret<0)
 803                     return ret;
 804                 buf_set(in, in, ret);
 805                 in_count -= ret;
 806                 ret2 += ret;
 807             }
 808             if(in_count){
 809                 buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 810                 copy(&tmp, in, in_count);
 811                 s->in_buffer_count += in_count;
 812             }
 813         }
 814         if(ret2>0 && !s->drop_output)
 815             s->outpts += ret2 * (int64_t)s->in_sample_rate;
 816         av_assert2(max_output < 0 || ret2 < 0 || ret2 <= max_output);
 817         return ret2;
 818     }
 819 }
 820
 821 int swr_drop_output(struct SwrContext *s, int count){
 822     const uint8_t *tmp_arg[SWR_CH_MAX];
 823     s->drop_output += count;
 824
 825     if(s->drop_output <= 0)
 826         return 0;
 827
 828     av_log(s, AV_LOG_VERBOSE, "discarding %d audio samples\n", count);
 829     return swr_convert(s, NULL, s->drop_output, tmp_arg, 0);
 830 }
 831
 832 int swr_inject_silence(struct SwrContext *s, int count){
 833     int ret, i;
 834     uint8_t *tmp_arg[SWR_CH_MAX];
 835
 836     if(count <= 0)
 837         return 0;
 838
 839 #define MAX_SILENCE_STEP 16384
 840     while (count > MAX_SILENCE_STEP) {
 841         if ((ret = swr_inject_silence(s, MAX_SILENCE_STEP)) < 0)
 842             return ret;
 843         count -= MAX_SILENCE_STEP;
 844     }
 845
 846     if((ret=swri_realloc_audio(&s->silence, count))<0)
 847         return ret;
 848
 849     if(s->silence.planar) for(i=0; i<s->silence.ch_count; i++) {
 850         memset(s->silence.ch[i], s->silence.bps==1 ? 0x80 : 0, count*s->silence.bps);
 851     } else
 852         memset(s->silence.ch[0], s->silence.bps==1 ? 0x80 : 0, count*s->silence.bps*s->silence.ch_count);
 853
 854     reversefill_audiodata(&s->silence, tmp_arg);
 855     av_log(s, AV_LOG_VERBOSE, "adding %d audio samples of silence\n", count);
 856     ret = swr_convert(s, NULL, 0, (const uint8_t**)tmp_arg, count);
 857     return ret;
 858 }
 859
 860 int64_t swr_get_delay(struct SwrContext *s, int64_t base){
 861     if (s->resampler && s->resample){
 862         return s->resampler->get_delay(s, base);
 863     }else{
 864         return (s->in_buffer_count*base + (s->in_sample_rate>>1))/ s->in_sample_rate;
 865     }
 866 }
 867
 868 int swr_get_out_samples(struct SwrContext *s, int in_samples)
 869 {
 870     int64_t out_samples;
 871
 872     if (in_samples < 0)
 873         return AVERROR(EINVAL);
 874
 875     if (s->resampler && s->resample) {
 876         if (!s->resampler->get_out_samples)
 877             return AVERROR(ENOSYS);
 878         out_samples = s->resampler->get_out_samples(s, in_samples);
 879     } else {
 880         out_samples = s->in_buffer_count + in_samples;
 881         av_assert0(s->out_sample_rate == s->in_sample_rate);
 882     }
 883
 884     if (out_samples > INT_MAX)
 885         return AVERROR(EINVAL);
 886
 887     return out_samples;
 888 }
 889
 890 int swr_set_compensation(struct SwrContext *s, int sample_delta, int compensation_distance){
 891     int ret;
 892
 893     if (!s || compensation_distance < 0)
 894         return AVERROR(EINVAL);
 895     if (!compensation_distance && sample_delta)
 896         return AVERROR(EINVAL);
 897     if (!s->resample) {
 898         s->flags |= SWR_FLAG_RESAMPLE;
 899         ret = swr_init(s);
 900         if (ret < 0)
 901             return ret;
 902     }
 903     if (!s->resampler->set_compensation){
 904         return AVERROR(EINVAL);
 905     }else{
 906         return s->resampler->set_compensation(s->resample, sample_delta, compensation_distance);
 907     }
 908 }
 909
 910 int64_t swr_next_pts(struct SwrContext *s, int64_t pts){
 911     if(pts == INT64_MIN)
 912         return s->outpts;
 913
 914     if (s->firstpts == AV_NOPTS_VALUE)
 915         s->outpts = s->firstpts = pts;
 916
 917     if(s->min_compensation >= FLT_MAX) {
 918         return (s->outpts = pts - swr_get_delay(s, s->in_sample_rate * (int64_t)s->out_sample_rate));
 919     } else {
 920         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;
 921         double fdelta = delta /(double)(s->in_sample_rate * (int64_t)s->out_sample_rate);
 922
 923         if(fabs(fdelta) > s->min_compensation) {
 924             if(s->outpts == s->firstpts || fabs(fdelta) > s->min_hard_compensation){
 925                 int ret;
 926                 if(delta > 0) ret = swr_inject_silence(s,  delta / s->out_sample_rate);
 927                 else          ret = swr_drop_output   (s, -delta / s-> in_sample_rate);
 928                 if(ret<0){
 929                     av_log(s, AV_LOG_ERROR, "Failed to compensate for timestamp delta of %f\n", fdelta);
 930                 }
 931             } else if(s->soft_compensation_duration && s->max_soft_compensation) {
 932                 int duration = s->out_sample_rate * s->soft_compensation_duration;
 933                 double max_soft_compensation = s->max_soft_compensation / (s->max_soft_compensation < 0 ? -s->in_sample_rate : 1);
 934                 int comp = av_clipf(fdelta, -max_soft_compensation, max_soft_compensation) * duration ;
 935                 av_log(s, AV_LOG_VERBOSE, "compensating audio timestamp drift:%f compensation:%d in:%d\n", fdelta, comp, duration);
 936                 swr_set_compensation(s, comp, duration);
 937             }
 938         }
 939
 940         return s->outpts;
 941     }
 942 }