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   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     if(s-> in_sample_rate <= 0){
 168         av_log(s, AV_LOG_ERROR, "Requested input sample rate %d is invalid\n", s->in_sample_rate);
 169         return AVERROR(EINVAL);
 170     }
 171     if(s->out_sample_rate <= 0){
 172         av_log(s, AV_LOG_ERROR, "Requested output sample rate %d is invalid\n", s->out_sample_rate);
 173         return AVERROR(EINVAL);
 174     }
 175     s->out.ch_count  = s-> user_out_ch_count;
 176     s-> in.ch_count  = s->  user_in_ch_count;
 177     s->used_ch_count = s->user_used_ch_count;
 178
 179     s-> in_ch_layout = s-> user_in_ch_layout;
 180     s->out_ch_layout = s->user_out_ch_layout;
 181
 182     s->int_sample_fmt= s->user_int_sample_fmt;
 183
 184     s->dither.method = s->user_dither_method;
 185
 186     if(av_get_channel_layout_nb_channels(s-> in_ch_layout) > SWR_CH_MAX) {
 187         av_log(s, AV_LOG_WARNING, "Input channel layout 0x%"PRIx64" is invalid or unsupported.\n", s-> in_ch_layout);
 188         s->in_ch_layout = 0;
 189     }
 190
 191     if(av_get_channel_layout_nb_channels(s->out_ch_layout) > SWR_CH_MAX) {
 192         av_log(s, AV_LOG_WARNING, "Output channel layout 0x%"PRIx64" is invalid or unsupported.\n", s->out_ch_layout);
 193         s->out_ch_layout = 0;
 194     }
 195
 196     switch(s->engine){
 197 #if CONFIG_LIBSOXR
 198         case SWR_ENGINE_SOXR: s->resampler = &swri_soxr_resampler; break;
 199 #endif
 200         case SWR_ENGINE_SWR : s->resampler = &swri_resampler; break;
 201         default:
 202             av_log(s, AV_LOG_ERROR, "Requested resampling engine is unavailable\n");
 203             return AVERROR(EINVAL);
 204     }
 205
 206     if(!s->used_ch_count)
 207         s->used_ch_count= s->in.ch_count;
 208
 209     if(s->used_ch_count && s-> in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s-> in_ch_layout)){
 210         av_log(s, AV_LOG_WARNING, "Input channel layout has a different number of channels than the number of used channels, ignoring layout\n");
 211         s-> in_ch_layout= 0;
 212     }
 213
 214     if(!s-> in_ch_layout)
 215         s-> in_ch_layout= av_get_default_channel_layout(s->used_ch_count);
 216     if(!s->out_ch_layout)
 217         s->out_ch_layout= av_get_default_channel_layout(s->out.ch_count);
 218
 219     s->rematrix= s->out_ch_layout  !=s->in_ch_layout || s->rematrix_volume!=1.0 ||
 220                  s->rematrix_custom;
 221
 222     if(s->int_sample_fmt == AV_SAMPLE_FMT_NONE){
 223         if(   av_get_bytes_per_sample(s-> in_sample_fmt) <= 2
 224            && av_get_bytes_per_sample(s->out_sample_fmt) <= 2){
 225             s->int_sample_fmt= AV_SAMPLE_FMT_S16P;
 226         }else if(   av_get_bytes_per_sample(s-> in_sample_fmt) <= 2
 227            && !s->rematrix
 228            && s->out_sample_rate==s->in_sample_rate
 229            && !(s->flags & SWR_FLAG_RESAMPLE)){
 230             s->int_sample_fmt= AV_SAMPLE_FMT_S16P;
 231         }else if(   av_get_planar_sample_fmt(s-> in_sample_fmt) == AV_SAMPLE_FMT_S32P
 232                  && av_get_planar_sample_fmt(s->out_sample_fmt) == AV_SAMPLE_FMT_S32P
 233                  && !s->rematrix
 234                  && s->out_sample_rate == s->in_sample_rate
 235                  && !(s->flags & SWR_FLAG_RESAMPLE)
 236                  && s->engine != SWR_ENGINE_SOXR){
 237             s->int_sample_fmt= AV_SAMPLE_FMT_S32P;
 238         }else if(av_get_bytes_per_sample(s->in_sample_fmt) <= 4){
 239             s->int_sample_fmt= AV_SAMPLE_FMT_FLTP;
 240         }else{
 241             s->int_sample_fmt= AV_SAMPLE_FMT_DBLP;
 242         }
 243     }
 244     av_log(s, AV_LOG_DEBUG, "Using %s internally between filters\n", av_get_sample_fmt_name(s->int_sample_fmt));
 245
 246     if(   s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 247         &&s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 248         &&s->int_sample_fmt != AV_SAMPLE_FMT_S64P
 249         &&s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
 250         &&s->int_sample_fmt != AV_SAMPLE_FMT_DBLP){
 251         av_log(s, AV_LOG_ERROR, "Requested sample format %s is not supported internally, s16p/s32p/s64p/fltp/dblp are supported\n", av_get_sample_fmt_name(s->int_sample_fmt));
 252         return AVERROR(EINVAL);
 253     }
 254
 255     set_audiodata_fmt(&s-> in, s-> in_sample_fmt);
 256     set_audiodata_fmt(&s->out, s->out_sample_fmt);
 257
 258     if (s->firstpts_in_samples != AV_NOPTS_VALUE) {
 259         if (!s->async && s->min_compensation >= FLT_MAX/2)
 260             s->async = 1;
 261         s->firstpts =
 262         s->outpts   = s->firstpts_in_samples * s->out_sample_rate;
 263     } else
 264         s->firstpts = AV_NOPTS_VALUE;
 265
 266     if (s->async) {
 267         if (s->min_compensation >= FLT_MAX/2)
 268             s->min_compensation = 0.001;
 269         if (s->async > 1.0001) {
 270             s->max_soft_compensation = s->async / (double) s->in_sample_rate;
 271         }
 272     }
 273
 274     if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
 275         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);
 276         if (!s->resample) {
 277             av_log(s, AV_LOG_ERROR, "Failed to initialize resampler\n");
 278             return AVERROR(ENOMEM);
 279         }
 280     }else
 281         s->resampler->free(&s->resample);
 282     if(    s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 283         && s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 284         && s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
 285         && s->int_sample_fmt != AV_SAMPLE_FMT_DBLP
 286         && s->resample){
 287         av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16p/s32p/fltp/dblp\n");
 288         ret = AVERROR(EINVAL);
 289         goto fail;
 290     }
 291
 292 #define RSC 1 //FIXME finetune
 293     if(!s-> in.ch_count)
 294         s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
 295     if(!s->used_ch_count)
 296         s->used_ch_count= s->in.ch_count;
 297     if(!s->out.ch_count)
 298         s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
 299
 300     if(!s-> in.ch_count){
 301         av_assert0(!s->in_ch_layout);
 302         av_log(s, AV_LOG_ERROR, "Input channel count and layout are unset\n");
 303         ret = AVERROR(EINVAL);
 304         goto fail;
 305     }
 306
 307     av_get_channel_layout_string(l1, sizeof(l1), s-> in.ch_count, s-> in_ch_layout);
 308     av_get_channel_layout_string(l2, sizeof(l2), s->out.ch_count, s->out_ch_layout);
 309     if (s->out_ch_layout && s->out.ch_count != av_get_channel_layout_nb_channels(s->out_ch_layout)) {
 310         av_log(s, AV_LOG_ERROR, "Output channel layout %s mismatches specified channel count %d\n", l2, s->out.ch_count);
 311         ret = AVERROR(EINVAL);
 312         goto fail;
 313     }
 314     if (s->in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s->in_ch_layout)) {
 315         av_log(s, AV_LOG_ERROR, "Input channel layout %s mismatches specified channel count %d\n", l1, s->used_ch_count);
 316         ret = AVERROR(EINVAL);
 317         goto fail;
 318     }
 319
 320     if ((!s->out_ch_layout || !s->in_ch_layout) && s->used_ch_count != s->out.ch_count && !s->rematrix_custom) {
 321         av_log(s, AV_LOG_ERROR, "Rematrix is needed between %s and %s "
 322                "but there is not enough information to do it\n", l1, l2);
 323         ret = AVERROR(EINVAL);
 324         goto fail;
 325     }
 326
 327 av_assert0(s->used_ch_count);
 328 av_assert0(s->out.ch_count);
 329     s->resample_first= RSC*s->out.ch_count/s->used_ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;
 330
 331     s->in_buffer= s->in;
 332     s->silence  = s->in;
 333     s->drop_temp= s->out;
 334
 335     if ((ret = swri_dither_init(s, s->out_sample_fmt, s->int_sample_fmt)) < 0)
 336         goto fail;
 337
 338     if(!s->resample && !s->rematrix && !s->channel_map && !s->dither.method){
 339         s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt,
 340                                                    s-> in_sample_fmt, s-> in.ch_count, NULL, 0);
 341         return 0;
 342     }
 343
 344     s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt,
 345                                              s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0);
 346     s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt,
 347                                              s->int_sample_fmt, s->out.ch_count, NULL, 0);
 348
 349     if (!s->in_convert || !s->out_convert) {
 350         ret = AVERROR(ENOMEM);
 351         goto fail;
 352     }
 353
 354     s->postin= s->in;
 355     s->preout= s->out;
 356     s->midbuf= s->in;
 357
 358     if(s->channel_map){
 359         s->postin.ch_count=
 360         s->midbuf.ch_count= s->used_ch_count;
 361         if(s->resample)
 362             s->in_buffer.ch_count= s->used_ch_count;
 363     }
 364     if(!s->resample_first){
 365         s->midbuf.ch_count= s->out.ch_count;
 366         if(s->resample)
 367             s->in_buffer.ch_count = s->out.ch_count;
 368     }
 369
 370     set_audiodata_fmt(&s->postin, s->int_sample_fmt);
 371     set_audiodata_fmt(&s->midbuf, s->int_sample_fmt);
 372     set_audiodata_fmt(&s->preout, s->int_sample_fmt);
 373
 374     if(s->resample){
 375         set_audiodata_fmt(&s->in_buffer, s->int_sample_fmt);
 376     }
 377
 378     av_assert0(!s->preout.count);
 379     s->dither.noise = s->preout;
 380     s->dither.temp  = s->preout;
 381     if (s->dither.method > SWR_DITHER_NS) {
 382         s->dither.noise.bps = 4;
 383         s->dither.noise.fmt = AV_SAMPLE_FMT_FLTP;
 384         s->dither.noise_scale = 1;
 385     }
 386
 387     if(s->rematrix || s->dither.method) {
 388         ret = swri_rematrix_init(s);
 389         if (ret < 0)
 390             goto fail;
 391     }
 392
 393     return 0;
 394 fail:
 395     swr_close(s);
 396     return ret;
 397
 398 }
 399
 400 int swri_realloc_audio(AudioData *a, int count){
 401     int i, countb;
 402     AudioData old;
 403
 404     if(count < 0 || count > INT_MAX/2/a->bps/a->ch_count)
 405         return AVERROR(EINVAL);
 406
 407     if(a->count >= count)
 408         return 0;
 409
 410     count*=2;
 411
 412     countb= FFALIGN(count*a->bps, ALIGN);
 413     old= *a;
 414
 415     av_assert0(a->bps);
 416     av_assert0(a->ch_count);
 417
 418     a->data= av_mallocz_array(countb, a->ch_count);
 419     if(!a->data)
 420         return AVERROR(ENOMEM);
 421     for(i=0; i<a->ch_count; i++){
 422         a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
 423         if(a->count && a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
 424     }
 425     if(a->count && !a->planar) memcpy(a->ch[0], old.ch[0], a->count*a->ch_count*a->bps);
 426     av_freep(&old.data);
 427     a->count= count;
 428
 429     return 1;
 430 }
 431
 432 static void copy(AudioData *out, AudioData *in,
 433                  int count){
 434     av_assert0(out->planar == in->planar);
 435     av_assert0(out->bps == in->bps);
 436     av_assert0(out->ch_count == in->ch_count);
 437     if(out->planar){
 438         int ch;
 439         for(ch=0; ch<out->ch_count; ch++)
 440             memcpy(out->ch[ch], in->ch[ch], count*out->bps);
 441     }else
 442         memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
 443 }
 444
 445 static void fill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 446     int i;
 447     if(!in_arg){
 448         memset(out->ch, 0, sizeof(out->ch));
 449     }else if(out->planar){
 450         for(i=0; i<out->ch_count; i++)
 451             out->ch[i]= in_arg[i];
 452     }else{
 453         for(i=0; i<out->ch_count; i++)
 454             out->ch[i]= in_arg[0] + i*out->bps;
 455     }
 456 }
 457
 458 static void reversefill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 459     int i;
 460     if(out->planar){
 461         for(i=0; i<out->ch_count; i++)
 462             in_arg[i]= out->ch[i];
 463     }else{
 464         in_arg[0]= out->ch[0];
 465     }
 466 }
 467
 468 /**
 469  *
 470  * out may be equal in.
 471  */
 472 static void buf_set(AudioData *out, AudioData *in, int count){
 473     int ch;
 474     if(in->planar){
 475         for(ch=0; ch<out->ch_count; ch++)
 476             out->ch[ch]= in->ch[ch] + count*out->bps;
 477     }else{
 478         for(ch=out->ch_count-1; ch>=0; ch--)
 479             out->ch[ch]= in->ch[0] + (ch + count*out->ch_count) * out->bps;
 480     }
 481 }
 482
 483 /**
 484  *
 485  * @return number of samples output per channel
 486  */
 487 static int resample(SwrContext *s, AudioData *out_param, int out_count,
 488                              const AudioData * in_param, int in_count){
 489     AudioData in, out, tmp;
 490     int ret_sum=0;
 491     int border=0;
 492     int padless = ARCH_X86 && s->engine == SWR_ENGINE_SWR ? 7 : 0;
 493
 494     av_assert1(s->in_buffer.ch_count == in_param->ch_count);
 495     av_assert1(s->in_buffer.planar   == in_param->planar);
 496     av_assert1(s->in_buffer.fmt      == in_param->fmt);
 497
 498     tmp=out=*out_param;
 499     in =  *in_param;
 500
 501     border = s->resampler->invert_initial_buffer(s->resample, &s->in_buffer,
 502                  &in, in_count, &s->in_buffer_index, &s->in_buffer_count);
 503     if (border == INT_MAX) {
 504         return 0;
 505     } else if (border < 0) {
 506         return border;
 507     } else if (border) {
 508         buf_set(&in, &in, border);
 509         in_count -= border;
 510         s->resample_in_constraint = 0;
 511     }
 512
 513     do{
 514         int ret, size, consumed;
 515         if(!s->resample_in_constraint && s->in_buffer_count){
 516             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 517             ret= s->resampler->multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
 518             out_count -= ret;
 519             ret_sum += ret;
 520             buf_set(&out, &out, ret);
 521             s->in_buffer_count -= consumed;
 522             s->in_buffer_index += consumed;
 523
 524             if(!in_count)
 525                 break;
 526             if(s->in_buffer_count <= border){
 527                 buf_set(&in, &in, -s->in_buffer_count);
 528                 in_count += s->in_buffer_count;
 529                 s->in_buffer_count=0;
 530                 s->in_buffer_index=0;
 531                 border = 0;
 532             }
 533         }
 534
 535         if((s->flushed || in_count > padless) && !s->in_buffer_count){
 536             s->in_buffer_index=0;
 537             ret= s->resampler->multiple_resample(s->resample, &out, out_count, &in, FFMAX(in_count-padless, 0), &consumed);
 538             out_count -= ret;
 539             ret_sum += ret;
 540             buf_set(&out, &out, ret);
 541             in_count -= consumed;
 542             buf_set(&in, &in, consumed);
 543         }
 544
 545         //TODO is this check sane considering the advanced copy avoidance below
 546         size= s->in_buffer_index + s->in_buffer_count + in_count;
 547         if(   size > s->in_buffer.count
 548            && s->in_buffer_count + in_count <= s->in_buffer_index){
 549             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 550             copy(&s->in_buffer, &tmp, s->in_buffer_count);
 551             s->in_buffer_index=0;
 552         }else
 553             if((ret=swri_realloc_audio(&s->in_buffer, size)) < 0)
 554                 return ret;
 555
 556         if(in_count){
 557             int count= in_count;
 558             if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;
 559
 560             buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 561             copy(&tmp, &in, /*in_*/count);
 562             s->in_buffer_count += count;
 563             in_count -= count;
 564             border += count;
 565             buf_set(&in, &in, count);
 566             s->resample_in_constraint= 0;
 567             if(s->in_buffer_count != count || in_count)
 568                 continue;
 569             if (padless) {
 570                 padless = 0;
 571                 continue;
 572             }
 573         }
 574         break;
 575     }while(1);
 576
 577     s->resample_in_constraint= !!out_count;
 578
 579     return ret_sum;
 580 }
 581
 582 static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_count,
 583                                                       AudioData *in , int  in_count){
 584     AudioData *postin, *midbuf, *preout;
 585     int ret/*, in_max*/;
 586     AudioData preout_tmp, midbuf_tmp;
 587
 588     if(s->full_convert){
 589         av_assert0(!s->resample);
 590         swri_audio_convert(s->full_convert, out, in, in_count);
 591         return out_count;
 592     }
 593
 594 //     in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
 595 //     in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);
 596
 597     if((ret=swri_realloc_audio(&s->postin, in_count))<0)
 598         return ret;
 599     if(s->resample_first){
 600         av_assert0(s->midbuf.ch_count == s->used_ch_count);
 601         if((ret=swri_realloc_audio(&s->midbuf, out_count))<0)
 602             return ret;
 603     }else{
 604         av_assert0(s->midbuf.ch_count ==  s->out.ch_count);
 605         if((ret=swri_realloc_audio(&s->midbuf,  in_count))<0)
 606             return ret;
 607     }
 608     if((ret=swri_realloc_audio(&s->preout, out_count))<0)
 609         return ret;
 610
 611     postin= &s->postin;
 612
 613     midbuf_tmp= s->midbuf;
 614     midbuf= &midbuf_tmp;
 615     preout_tmp= s->preout;
 616     preout= &preout_tmp;
 617
 618     if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar && !s->channel_map)
 619         postin= in;
 620
 621     if(s->resample_first ? !s->resample : !s->rematrix)
 622         midbuf= postin;
 623
 624     if(s->resample_first ? !s->rematrix : !s->resample)
 625         preout= midbuf;
 626
 627     if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar
 628        && !(s->out_sample_fmt==AV_SAMPLE_FMT_S32P && (s->dither.output_sample_bits&31))){
 629         if(preout==in){
 630             out_count= FFMIN(out_count, in_count); //TODO check at the end if this is needed or redundant
 631             av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
 632             copy(out, in, out_count);
 633             return out_count;
 634         }
 635         else if(preout==postin) preout= midbuf= postin= out;
 636         else if(preout==midbuf) preout= midbuf= out;
 637         else                    preout= out;
 638     }
 639
 640     if(in != postin){
 641         swri_audio_convert(s->in_convert, postin, in, in_count);
 642     }
 643
 644     if(s->resample_first){
 645         if(postin != midbuf)
 646             out_count= resample(s, midbuf, out_count, postin, in_count);
 647         if(midbuf != preout)
 648             swri_rematrix(s, preout, midbuf, out_count, preout==out);
 649     }else{
 650         if(postin != midbuf)
 651             swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
 652         if(midbuf != preout)
 653             out_count= resample(s, preout, out_count, midbuf, in_count);
 654     }
 655
 656     if(preout != out && out_count){
 657         AudioData *conv_src = preout;
 658         if(s->dither.method){
 659             int ch;
 660             int dither_count= FFMAX(out_count, 1<<16);
 661
 662             if (preout == in) {
 663                 conv_src = &s->dither.temp;
 664                 if((ret=swri_realloc_audio(&s->dither.temp, dither_count))<0)
 665                     return ret;
 666             }
 667
 668             if((ret=swri_realloc_audio(&s->dither.noise, dither_count))<0)
 669                 return ret;
 670             if(ret)
 671                 for(ch=0; ch<s->dither.noise.ch_count; ch++)
 672                     if((ret=swri_get_dither(s, s->dither.noise.ch[ch], s->dither.noise.count, (12345678913579ULL*ch + 3141592) % 2718281828U, s->dither.noise.fmt))<0)
 673                         return ret;
 674             av_assert0(s->dither.noise.ch_count == preout->ch_count);
 675
 676             if(s->dither.noise_pos + out_count > s->dither.noise.count)
 677                 s->dither.noise_pos = 0;
 678
 679             if (s->dither.method < SWR_DITHER_NS){
 680                 if (s->mix_2_1_simd) {
 681                     int len1= out_count&~15;
 682                     int off = len1 * preout->bps;
 683
 684                     if(len1)
 685                         for(ch=0; ch<preout->ch_count; ch++)
 686                             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);
 687                     if(out_count != len1)
 688                         for(ch=0; ch<preout->ch_count; ch++)
 689                             s->mix_2_1_f(conv_src->ch[ch] + off, preout->ch[ch] + off, s->dither.noise.ch[ch] + s->dither.noise.bps * s->dither.noise_pos + off, s->native_one, 0, 0, out_count - len1);
 690                 } else {
 691                     for(ch=0; ch<preout->ch_count; ch++)
 692                         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);
 693                 }
 694             } else {
 695                 switch(s->int_sample_fmt) {
 696                 case AV_SAMPLE_FMT_S16P :swri_noise_shaping_int16(s, conv_src, preout, &s->dither.noise, out_count); break;
 697                 case AV_SAMPLE_FMT_S32P :swri_noise_shaping_int32(s, conv_src, preout, &s->dither.noise, out_count); break;
 698                 case AV_SAMPLE_FMT_FLTP :swri_noise_shaping_float(s, conv_src, preout, &s->dither.noise, out_count); break;
 699                 case AV_SAMPLE_FMT_DBLP :swri_noise_shaping_double(s,conv_src, preout, &s->dither.noise, out_count); break;
 700                 }
 701             }
 702             s->dither.noise_pos += out_count;
 703         }
 704 //FIXME packed doesn't need more than 1 chan here!
 705         swri_audio_convert(s->out_convert, out, conv_src, out_count);
 706     }
 707     return out_count;
 708 }
 709
 710 int swr_is_initialized(struct SwrContext *s) {
 711     return !!s->in_buffer.ch_count;
 712 }
 713
 714 int attribute_align_arg swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
 715                                                     const uint8_t *in_arg [SWR_CH_MAX], int  in_count){
 716     AudioData * in= &s->in;
 717     AudioData *out= &s->out;
 718     int av_unused max_output;
 719
 720     if (!swr_is_initialized(s)) {
 721         av_log(s, AV_LOG_ERROR, "Context has not been initialized\n");
 722         return AVERROR(EINVAL);
 723     }
 724 #if defined(ASSERT_LEVEL) && ASSERT_LEVEL >1
 725     max_output = swr_get_out_samples(s, in_count);
 726 #endif
 727
 728     while(s->drop_output > 0){
 729         int ret;
 730         uint8_t *tmp_arg[SWR_CH_MAX];
 731 #define MAX_DROP_STEP 16384
 732         if((ret=swri_realloc_audio(&s->drop_temp, FFMIN(s->drop_output, MAX_DROP_STEP)))<0)
 733             return ret;
 734
 735         reversefill_audiodata(&s->drop_temp, tmp_arg);
 736         s->drop_output *= -1; //FIXME find a less hackish solution
 737         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
 738         s->drop_output *= -1;
 739         in_count = 0;
 740         if(ret>0) {
 741             s->drop_output -= ret;
 742             if (!s->drop_output && !out_arg)
 743                 return 0;
 744             continue;
 745         }
 746
 747         av_assert0(s->drop_output);
 748         return 0;
 749     }
 750
 751     if(!in_arg){
 752         if(s->resample){
 753             if (!s->flushed)
 754                 s->resampler->flush(s);
 755             s->resample_in_constraint = 0;
 756             s->flushed = 1;
 757         }else if(!s->in_buffer_count){
 758             return 0;
 759         }
 760     }else
 761         fill_audiodata(in ,  (void*)in_arg);
 762
 763     fill_audiodata(out, out_arg);
 764
 765     if(s->resample){
 766         int ret = swr_convert_internal(s, out, out_count, in, in_count);
 767         if(ret>0 && !s->drop_output)
 768             s->outpts += ret * (int64_t)s->in_sample_rate;
 769
 770         av_assert2(max_output < 0 || ret < 0 || ret <= max_output);
 771
 772         return ret;
 773     }else{
 774         AudioData tmp= *in;
 775         int ret2=0;
 776         int ret, size;
 777         size = FFMIN(out_count, s->in_buffer_count);
 778         if(size){
 779             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 780             ret= swr_convert_internal(s, out, size, &tmp, size);
 781             if(ret<0)
 782                 return ret;
 783             ret2= ret;
 784             s->in_buffer_count -= ret;
 785             s->in_buffer_index += ret;
 786             buf_set(out, out, ret);
 787             out_count -= ret;
 788             if(!s->in_buffer_count)
 789                 s->in_buffer_index = 0;
 790         }
 791
 792         if(in_count){
 793             size= s->in_buffer_index + s->in_buffer_count + in_count - out_count;
 794
 795             if(in_count > out_count) { //FIXME move after swr_convert_internal
 796                 if(   size > s->in_buffer.count
 797                 && s->in_buffer_count + in_count - out_count <= s->in_buffer_index){
 798                     buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 799                     copy(&s->in_buffer, &tmp, s->in_buffer_count);
 800                     s->in_buffer_index=0;
 801                 }else
 802                     if((ret=swri_realloc_audio(&s->in_buffer, size)) < 0)
 803                         return ret;
 804             }
 805
 806             if(out_count){
 807                 size = FFMIN(in_count, out_count);
 808                 ret= swr_convert_internal(s, out, size, in, size);
 809                 if(ret<0)
 810                     return ret;
 811                 buf_set(in, in, ret);
 812                 in_count -= ret;
 813                 ret2 += ret;
 814             }
 815             if(in_count){
 816                 buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 817                 copy(&tmp, in, in_count);
 818                 s->in_buffer_count += in_count;
 819             }
 820         }
 821         if(ret2>0 && !s->drop_output)
 822             s->outpts += ret2 * (int64_t)s->in_sample_rate;
 823         av_assert2(max_output < 0 || ret2 < 0 || ret2 <= max_output);
 824         return ret2;
 825     }
 826 }
 827
 828 int swr_drop_output(struct SwrContext *s, int count){
 829     const uint8_t *tmp_arg[SWR_CH_MAX];
 830     s->drop_output += count;
 831
 832     if(s->drop_output <= 0)
 833         return 0;
 834
 835     av_log(s, AV_LOG_VERBOSE, "discarding %d audio samples\n", count);
 836     return swr_convert(s, NULL, s->drop_output, tmp_arg, 0);
 837 }
 838
 839 int swr_inject_silence(struct SwrContext *s, int count){
 840     int ret, i;
 841     uint8_t *tmp_arg[SWR_CH_MAX];
 842
 843     if(count <= 0)
 844         return 0;
 845
 846 #define MAX_SILENCE_STEP 16384
 847     while (count > MAX_SILENCE_STEP) {
 848         if ((ret = swr_inject_silence(s, MAX_SILENCE_STEP)) < 0)
 849             return ret;
 850         count -= MAX_SILENCE_STEP;
 851     }
 852
 853     if((ret=swri_realloc_audio(&s->silence, count))<0)
 854         return ret;
 855
 856     if(s->silence.planar) for(i=0; i<s->silence.ch_count; i++) {
 857         memset(s->silence.ch[i], s->silence.bps==1 ? 0x80 : 0, count*s->silence.bps);
 858     } else
 859         memset(s->silence.ch[0], s->silence.bps==1 ? 0x80 : 0, count*s->silence.bps*s->silence.ch_count);
 860
 861     reversefill_audiodata(&s->silence, tmp_arg);
 862     av_log(s, AV_LOG_VERBOSE, "adding %d audio samples of silence\n", count);
 863     ret = swr_convert(s, NULL, 0, (const uint8_t**)tmp_arg, count);
 864     return ret;
 865 }
 866
 867 int64_t swr_get_delay(struct SwrContext *s, int64_t base){
 868     if (s->resampler && s->resample){
 869         return s->resampler->get_delay(s, base);
 870     }else{
 871         return (s->in_buffer_count*base + (s->in_sample_rate>>1))/ s->in_sample_rate;
 872     }
 873 }
 874
 875 int swr_get_out_samples(struct SwrContext *s, int in_samples)
 876 {
 877     int64_t out_samples;
 878
 879     if (in_samples < 0)
 880         return AVERROR(EINVAL);
 881
 882     if (s->resampler && s->resample) {
 883         if (!s->resampler->get_out_samples)
 884             return AVERROR(ENOSYS);
 885         out_samples = s->resampler->get_out_samples(s, in_samples);
 886     } else {
 887         out_samples = s->in_buffer_count + in_samples;
 888         av_assert0(s->out_sample_rate == s->in_sample_rate);
 889     }
 890
 891     if (out_samples > INT_MAX)
 892         return AVERROR(EINVAL);
 893
 894     return out_samples;
 895 }
 896
 897 int swr_set_compensation(struct SwrContext *s, int sample_delta, int compensation_distance){
 898     int ret;
 899
 900     if (!s || compensation_distance < 0)
 901         return AVERROR(EINVAL);
 902     if (!compensation_distance && sample_delta)
 903         return AVERROR(EINVAL);
 904     if (!s->resample) {
 905         s->flags |= SWR_FLAG_RESAMPLE;
 906         ret = swr_init(s);
 907         if (ret < 0)
 908             return ret;
 909     }
 910     if (!s->resampler->set_compensation){
 911         return AVERROR(EINVAL);
 912     }else{
 913         return s->resampler->set_compensation(s->resample, sample_delta, compensation_distance);
 914     }
 915 }
 916
 917 int64_t swr_next_pts(struct SwrContext *s, int64_t pts){
 918     if(pts == INT64_MIN)
 919         return s->outpts;
 920
 921     if (s->firstpts == AV_NOPTS_VALUE)
 922         s->outpts = s->firstpts = pts;
 923
 924     if(s->min_compensation >= FLT_MAX) {
 925         return (s->outpts = pts - swr_get_delay(s, s->in_sample_rate * (int64_t)s->out_sample_rate));
 926     } else {
 927         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;
 928         double fdelta = delta /(double)(s->in_sample_rate * (int64_t)s->out_sample_rate);
 929
 930         if(fabs(fdelta) > s->min_compensation) {
 931             if(s->outpts == s->firstpts || fabs(fdelta) > s->min_hard_compensation){
 932                 int ret;
 933                 if(delta > 0) ret = swr_inject_silence(s,  delta / s->out_sample_rate);
 934                 else          ret = swr_drop_output   (s, -delta / s-> in_sample_rate);
 935                 if(ret<0){
 936                     av_log(s, AV_LOG_ERROR, "Failed to compensate for timestamp delta of %f\n", fdelta);
 937                 }
 938             } else if(s->soft_compensation_duration && s->max_soft_compensation) {
 939                 int duration = s->out_sample_rate * s->soft_compensation_duration;
 940                 double max_soft_compensation = s->max_soft_compensation / (s->max_soft_compensation < 0 ? -s->in_sample_rate : 1);
 941                 int comp = av_clipf(fdelta, -max_soft_compensation, max_soft_compensation) * duration ;
 942                 av_log(s, AV_LOG_VERBOSE, "compensating audio timestamp drift:%f compensation:%d in:%d\n", fdelta, comp, duration);
 943                 swr_set_compensation(s, comp, duration);
 944             }
 945         }
 946
 947         return s->outpts;
 948     }
 949 }