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

   1 /*
   2  * Copyright (C) 2011 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/audioconvert.h"
  26
  27 #define  C30DB  M_SQRT2
  28 #define  C15DB  1.189207115
  29 #define C__0DB  1.0
  30 #define C_15DB  0.840896415
  31 #define C_30DB  M_SQRT1_2
  32 #define C_45DB  0.594603558
  33 #define C_60DB  0.5
  34
  35
  36 //TODO split options array out?
  37 #define OFFSET(x) offsetof(SwrContext,x)
  38 static const AVOption options[]={
  39 {"ich",  "input channel count", OFFSET( in.ch_count   ), AV_OPT_TYPE_INT, {.dbl=2}, 0, SWR_CH_MAX, 0},
  40 {"och", "output channel count", OFFSET(out.ch_count   ), AV_OPT_TYPE_INT, {.dbl=2}, 0, SWR_CH_MAX, 0},
  41 {"uch",   "used channel count", OFFSET(used_ch_count  ), AV_OPT_TYPE_INT, {.dbl=0}, 0, SWR_CH_MAX, 0},
  42 {"isr",  "input sample rate"  , OFFSET( in_sample_rate), AV_OPT_TYPE_INT, {.dbl=48000}, 1, INT_MAX, 0},
  43 {"osr", "output sample rate"  , OFFSET(out_sample_rate), AV_OPT_TYPE_INT, {.dbl=48000}, 1, INT_MAX, 0},
  44 //{"ip" ,  "input planar"       , OFFSET( in.planar     ), AV_OPT_TYPE_INT, {.dbl=0},    0,       1, 0},
  45 //{"op" , "output planar"       , OFFSET(out.planar     ), AV_OPT_TYPE_INT, {.dbl=0},    0,       1, 0},
  46 {"isf",  "input sample format", OFFSET( in_sample_fmt ), AV_OPT_TYPE_INT, {.dbl=AV_SAMPLE_FMT_S16}, 0, AV_SAMPLE_FMT_NB-1+256, 0},
  47 {"osf", "output sample format", OFFSET(out_sample_fmt ), AV_OPT_TYPE_INT, {.dbl=AV_SAMPLE_FMT_S16}, 0, AV_SAMPLE_FMT_NB-1+256, 0},
  48 {"tsf", "internal sample format", OFFSET(int_sample_fmt ), AV_OPT_TYPE_INT, {.dbl=AV_SAMPLE_FMT_NONE}, -1, AV_SAMPLE_FMT_FLT, 0},
  49 {"icl",  "input channel layout" , OFFSET( in_ch_layout), AV_OPT_TYPE_INT64, {.dbl=0}, 0, INT64_MAX, 0, "channel_layout"},
  50 {"ocl",  "output channel layout", OFFSET(out_ch_layout), AV_OPT_TYPE_INT64, {.dbl=0}, 0, INT64_MAX, 0, "channel_layout"},
  51 {"clev", "center mix level"     , OFFSET(clev)         , AV_OPT_TYPE_FLOAT, {.dbl=C_30DB}, 0, 4, 0},
  52 {"slev", "sourround mix level"  , OFFSET(slev)         , AV_OPT_TYPE_FLOAT, {.dbl=C_30DB}, 0, 4, 0},
  53 {"rmvol", "rematrix volume"     , OFFSET(rematrix_volume), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, -1000, 1000, 0},
  54 {"flags", NULL                  , OFFSET(flags)        , AV_OPT_TYPE_FLAGS, {.dbl=0}, 0,  UINT_MAX, 0, "flags"},
  55 {"res", "force resampling", 0, AV_OPT_TYPE_CONST, {.dbl=SWR_FLAG_RESAMPLE}, INT_MIN, INT_MAX, 0, "flags"},
  56 {"dither", "dither method"      , OFFSET(dither_method), AV_OPT_TYPE_INT, {.dbl=0}, 0, SWR_DITHER_NB-1, 0, "dither_method"},
  57 {"rectangular", "rectangular dither", 0, AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_RECTANGULAR}, INT_MIN, INT_MAX, 0, "dither_method"},
  58 {"triangular" , "triangular dither" , 0, AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_TRIANGULAR }, INT_MIN, INT_MAX, 0, "dither_method"},
  59 {"triangular_hp" , "triangular dither with high pass" , 0, AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_TRIANGULAR_HIGHPASS }, INT_MIN, INT_MAX, 0, "dither_method"},
  60
  61 {0}
  62 };
  63
  64 static const char* context_to_name(void* ptr) {
  65     return "SWR";
  66 }
  67
  68 static const AVClass av_class = {
  69     .class_name                = "SwrContext",
  70     .item_name                 = context_to_name,
  71     .option                    = options,
  72     .version                   = LIBAVUTIL_VERSION_INT,
  73     .log_level_offset_offset   = OFFSET(log_level_offset),
  74     .parent_log_context_offset = OFFSET(log_ctx),
  75 };
  76
  77 unsigned swresample_version(void)
  78 {
  79     av_assert0(LIBSWRESAMPLE_VERSION_MICRO >= 100);
  80     return LIBSWRESAMPLE_VERSION_INT;
  81 }
  82
  83 const char *swresample_configuration(void)
  84 {
  85     return FFMPEG_CONFIGURATION;
  86 }
  87
  88 const char *swresample_license(void)
  89 {
  90 #define LICENSE_PREFIX "libswresample license: "
  91     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
  92 }
  93
  94 int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map){
  95     if(!s || s->in_convert) // s needs to be allocated but not initialized
  96         return AVERROR(EINVAL);
  97     s->channel_map = channel_map;
  98     return 0;
  99 }
 100
 101 const AVClass *swr_get_class(void)
 102 {
 103     return &av_class;
 104 }
 105
 106 struct SwrContext *swr_alloc(void){
 107     SwrContext *s= av_mallocz(sizeof(SwrContext));
 108     if(s){
 109         s->av_class= &av_class;
 110         av_opt_set_defaults(s);
 111     }
 112     return s;
 113 }
 114
 115 struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
 116                                       int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
 117                                       int64_t  in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
 118                                       int log_offset, void *log_ctx){
 119     if(!s) s= swr_alloc();
 120     if(!s) return NULL;
 121
 122     s->log_level_offset= log_offset;
 123     s->log_ctx= log_ctx;
 124
 125     av_opt_set_int(s, "ocl", out_ch_layout,   0);
 126     av_opt_set_int(s, "osf", out_sample_fmt,  0);
 127     av_opt_set_int(s, "osr", out_sample_rate, 0);
 128     av_opt_set_int(s, "icl", in_ch_layout,    0);
 129     av_opt_set_int(s, "isf", in_sample_fmt,   0);
 130     av_opt_set_int(s, "isr", in_sample_rate,  0);
 131     av_opt_set_int(s, "tsf", AV_SAMPLE_FMT_NONE,   0);
 132     av_opt_set_int(s, "ich", av_get_channel_layout_nb_channels(s-> in_ch_layout), 0);
 133     av_opt_set_int(s, "och", av_get_channel_layout_nb_channels(s->out_ch_layout), 0);
 134     av_opt_set_int(s, "uch", 0, 0);
 135     return s;
 136 }
 137
 138
 139 static void free_temp(AudioData *a){
 140     av_free(a->data);
 141     memset(a, 0, sizeof(*a));
 142 }
 143
 144 void swr_free(SwrContext **ss){
 145     SwrContext *s= *ss;
 146     if(s){
 147         free_temp(&s->postin);
 148         free_temp(&s->midbuf);
 149         free_temp(&s->preout);
 150         free_temp(&s->in_buffer);
 151         free_temp(&s->dither);
 152         swri_audio_convert_free(&s-> in_convert);
 153         swri_audio_convert_free(&s->out_convert);
 154         swri_audio_convert_free(&s->full_convert);
 155         swri_resample_free(&s->resample);
 156     }
 157
 158     av_freep(ss);
 159 }
 160
 161 int swr_init(struct SwrContext *s){
 162     s->in_buffer_index= 0;
 163     s->in_buffer_count= 0;
 164     s->resample_in_constraint= 0;
 165     free_temp(&s->postin);
 166     free_temp(&s->midbuf);
 167     free_temp(&s->preout);
 168     free_temp(&s->in_buffer);
 169     free_temp(&s->dither);
 170     swri_audio_convert_free(&s-> in_convert);
 171     swri_audio_convert_free(&s->out_convert);
 172     swri_audio_convert_free(&s->full_convert);
 173
 174     s->flushed = 0;
 175
 176     s-> in.planar= av_sample_fmt_is_planar(s-> in_sample_fmt);
 177     s->out.planar= av_sample_fmt_is_planar(s->out_sample_fmt);
 178     s-> in_sample_fmt= av_get_alt_sample_fmt(s-> in_sample_fmt, 0);
 179     s->out_sample_fmt= av_get_alt_sample_fmt(s->out_sample_fmt, 0);
 180
 181     if(s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
 182         av_log(s, AV_LOG_ERROR, "Requested input sample format %d is invalid\n", s->in_sample_fmt);
 183         return AVERROR(EINVAL);
 184     }
 185     if(s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
 186         av_log(s, AV_LOG_ERROR, "Requested output sample format %d is invalid\n", s->out_sample_fmt);
 187         return AVERROR(EINVAL);
 188     }
 189
 190     //FIXME should we allow/support using FLT on material that doesnt need it ?
 191     if(s->in_sample_fmt <= AV_SAMPLE_FMT_S16 || s->int_sample_fmt==AV_SAMPLE_FMT_S16){
 192         s->int_sample_fmt= AV_SAMPLE_FMT_S16;
 193     }else
 194         s->int_sample_fmt= AV_SAMPLE_FMT_FLT;
 195
 196     if(   s->int_sample_fmt != AV_SAMPLE_FMT_S16
 197         &&s->int_sample_fmt != AV_SAMPLE_FMT_S32
 198         &&s->int_sample_fmt != AV_SAMPLE_FMT_FLT){
 199         av_log(s, AV_LOG_ERROR, "Requested sample format %s is not supported internally, S16/S32/FLT is supported\n", av_get_sample_fmt_name(s->int_sample_fmt));
 200         return AVERROR(EINVAL);
 201     }
 202
 203     if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
 204         s->resample = swri_resample_init(s->resample, s->out_sample_rate, s->in_sample_rate, 16, 10, 0, 0.8, s->int_sample_fmt);
 205     }else
 206         swri_resample_free(&s->resample);
 207     if(    s->int_sample_fmt != AV_SAMPLE_FMT_S16
 208         && s->int_sample_fmt != AV_SAMPLE_FMT_S32
 209         && s->int_sample_fmt != AV_SAMPLE_FMT_FLT
 210         && s->resample){
 211         av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16/s32/flt\n");
 212         return -1;
 213     }
 214
 215     if(!s->used_ch_count)
 216         s->used_ch_count= s->in.ch_count;
 217
 218     if(s->used_ch_count && s-> in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s-> in_ch_layout)){
 219         av_log(s, AV_LOG_WARNING, "Input channel layout has a different number of channels than the number of used channels, ignoring layout\n");
 220         s-> in_ch_layout= 0;
 221     }
 222
 223     if(!s-> in_ch_layout)
 224         s-> in_ch_layout= av_get_default_channel_layout(s->used_ch_count);
 225     if(!s->out_ch_layout)
 226         s->out_ch_layout= av_get_default_channel_layout(s->out.ch_count);
 227
 228     s->rematrix= s->out_ch_layout  !=s->in_ch_layout || s->rematrix_volume!=1.0 ||
 229                  s->rematrix_custom;
 230
 231 #define RSC 1 //FIXME finetune
 232     if(!s-> in.ch_count)
 233         s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
 234     if(!s->used_ch_count)
 235         s->used_ch_count= s->in.ch_count;
 236     if(!s->out.ch_count)
 237         s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
 238
 239     if(!s-> in.ch_count){
 240         av_assert0(!s->in_ch_layout);
 241         av_log(s, AV_LOG_ERROR, "Input channel count and layout are unset\n");
 242         return -1;
 243     }
 244
 245     if ((!s->out_ch_layout || !s->in_ch_layout) && s->used_ch_count != s->out.ch_count && !s->rematrix_custom) {
 246         av_log(s, AV_LOG_ERROR, "Rematrix is needed but there is not enough information to do it\n");
 247         return -1;
 248     }
 249
 250 av_assert0(s->used_ch_count);
 251 av_assert0(s->out.ch_count);
 252     s->resample_first= RSC*s->out.ch_count/s->in.ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;
 253
 254     s-> in.bps= av_get_bytes_per_sample(s-> in_sample_fmt);
 255     s->int_bps= av_get_bytes_per_sample(s->int_sample_fmt);
 256     s->out.bps= av_get_bytes_per_sample(s->out_sample_fmt);
 257     s->in_buffer= s->in;
 258
 259     if(!s->resample && !s->rematrix && !s->channel_map){
 260         s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt,
 261                                                    s-> in_sample_fmt, s-> in.ch_count, NULL, 0);
 262         return 0;
 263     }
 264
 265     s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt,
 266                                              s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0);
 267     s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt,
 268                                              s->int_sample_fmt, s->out.ch_count, NULL, 0);
 269
 270
 271     s->postin= s->in;
 272     s->preout= s->out;
 273     s->midbuf= s->in;
 274
 275     if(s->channel_map){
 276         s->postin.ch_count=
 277         s->midbuf.ch_count= s->used_ch_count;
 278         if(s->resample)
 279             s->in_buffer.ch_count= s->used_ch_count;
 280     }
 281     if(!s->resample_first){
 282         s->midbuf.ch_count= s->out.ch_count;
 283         if(s->resample)
 284             s->in_buffer.ch_count = s->out.ch_count;
 285     }
 286
 287     s->postin.bps    = s->midbuf.bps    = s->preout.bps    =  s->int_bps;
 288     s->postin.planar = s->midbuf.planar = s->preout.planar =  1;
 289
 290     if(s->resample){
 291         s->in_buffer.bps    = s->int_bps;
 292         s->in_buffer.planar = 1;
 293     }
 294
 295     s->dither = s->preout;
 296
 297     if(s->rematrix)
 298         return swri_rematrix_init(s);
 299
 300     return 0;
 301 }
 302
 303 static int realloc_audio(AudioData *a, int count){
 304     int i, countb;
 305     AudioData old;
 306
 307     if(a->count >= count)
 308         return 0;
 309
 310     count*=2;
 311
 312     countb= FFALIGN(count*a->bps, 32);
 313     old= *a;
 314
 315     av_assert0(a->bps);
 316     av_assert0(a->ch_count);
 317
 318     a->data= av_malloc(countb*a->ch_count);
 319     if(!a->data)
 320         return AVERROR(ENOMEM);
 321     for(i=0; i<a->ch_count; i++){
 322         a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
 323         if(a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
 324     }
 325     if(!a->planar) memcpy(a->ch[0], old.ch[0], a->count*a->ch_count*a->bps);
 326     av_free(old.data);
 327     a->count= count;
 328
 329     return 1;
 330 }
 331
 332 static void copy(AudioData *out, AudioData *in,
 333                  int count){
 334     av_assert0(out->planar == in->planar);
 335     av_assert0(out->bps == in->bps);
 336     av_assert0(out->ch_count == in->ch_count);
 337     if(out->planar){
 338         int ch;
 339         for(ch=0; ch<out->ch_count; ch++)
 340             memcpy(out->ch[ch], in->ch[ch], count*out->bps);
 341     }else
 342         memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
 343 }
 344
 345 static void fill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 346     int i;
 347     if(out->planar){
 348         for(i=0; i<out->ch_count; i++)
 349             out->ch[i]= in_arg[i];
 350     }else{
 351         for(i=0; i<out->ch_count; i++)
 352             out->ch[i]= in_arg[0] + i*out->bps;
 353     }
 354 }
 355
 356 /**
 357  *
 358  * out may be equal in.
 359  */
 360 static void buf_set(AudioData *out, AudioData *in, int count){
 361     if(in->planar){
 362         int ch;
 363         for(ch=0; ch<out->ch_count; ch++)
 364             out->ch[ch]= in->ch[ch] + count*out->bps;
 365     }else
 366         out->ch[0]= in->ch[0] + count*out->ch_count*out->bps;
 367 }
 368
 369 /**
 370  *
 371  * @return number of samples output per channel
 372  */
 373 static int resample(SwrContext *s, AudioData *out_param, int out_count,
 374                              const AudioData * in_param, int in_count){
 375     AudioData in, out, tmp;
 376     int ret_sum=0;
 377     int border=0;
 378
 379     tmp=out=*out_param;
 380     in =  *in_param;
 381
 382     do{
 383         int ret, size, consumed;
 384         if(!s->resample_in_constraint && s->in_buffer_count){
 385             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 386             ret= swri_multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
 387             out_count -= ret;
 388             ret_sum += ret;
 389             buf_set(&out, &out, ret);
 390             s->in_buffer_count -= consumed;
 391             s->in_buffer_index += consumed;
 392
 393             if(!in_count)
 394                 break;
 395             if(s->in_buffer_count <= border){
 396                 buf_set(&in, &in, -s->in_buffer_count);
 397                 in_count += s->in_buffer_count;
 398                 s->in_buffer_count=0;
 399                 s->in_buffer_index=0;
 400                 border = 0;
 401             }
 402         }
 403
 404         if(in_count && !s->in_buffer_count){
 405             s->in_buffer_index=0;
 406             ret= swri_multiple_resample(s->resample, &out, out_count, &in, in_count, &consumed);
 407             out_count -= ret;
 408             ret_sum += ret;
 409             buf_set(&out, &out, ret);
 410             in_count -= consumed;
 411             buf_set(&in, &in, consumed);
 412         }
 413
 414         //TODO is this check sane considering the advanced copy avoidance below
 415         size= s->in_buffer_index + s->in_buffer_count + in_count;
 416         if(   size > s->in_buffer.count
 417            && s->in_buffer_count + in_count <= s->in_buffer_index){
 418             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 419             copy(&s->in_buffer, &tmp, s->in_buffer_count);
 420             s->in_buffer_index=0;
 421         }else
 422             if((ret=realloc_audio(&s->in_buffer, size)) < 0)
 423                 return ret;
 424
 425         if(in_count){
 426             int count= in_count;
 427             if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;
 428
 429             buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 430             copy(&tmp, &in, /*in_*/count);
 431             s->in_buffer_count += count;
 432             in_count -= count;
 433             border += count;
 434             buf_set(&in, &in, count);
 435             s->resample_in_constraint= 0;
 436             if(s->in_buffer_count != count || in_count)
 437                 continue;
 438         }
 439         break;
 440     }while(1);
 441
 442     s->resample_in_constraint= !!out_count;
 443
 444     return ret_sum;
 445 }
 446
 447 static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_count,
 448                                                       AudioData *in , int  in_count){
 449     AudioData *postin, *midbuf, *preout;
 450     int ret/*, in_max*/;
 451     AudioData preout_tmp, midbuf_tmp;
 452
 453     if(s->full_convert){
 454         av_assert0(!s->resample);
 455         swri_audio_convert(s->full_convert, out, in, in_count);
 456         return out_count;
 457     }
 458
 459 //     in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
 460 //     in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);
 461
 462     if((ret=realloc_audio(&s->postin, in_count))<0)
 463         return ret;
 464     if(s->resample_first){
 465         av_assert0(s->midbuf.ch_count == s->used_ch_count);
 466         if((ret=realloc_audio(&s->midbuf, out_count))<0)
 467             return ret;
 468     }else{
 469         av_assert0(s->midbuf.ch_count ==  s->out.ch_count);
 470         if((ret=realloc_audio(&s->midbuf,  in_count))<0)
 471             return ret;
 472     }
 473     if((ret=realloc_audio(&s->preout, out_count))<0)
 474         return ret;
 475
 476     postin= &s->postin;
 477
 478     midbuf_tmp= s->midbuf;
 479     midbuf= &midbuf_tmp;
 480     preout_tmp= s->preout;
 481     preout= &preout_tmp;
 482
 483     if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar)
 484         postin= in;
 485
 486     if(s->resample_first ? !s->resample : !s->rematrix)
 487         midbuf= postin;
 488
 489     if(s->resample_first ? !s->rematrix : !s->resample)
 490         preout= midbuf;
 491
 492     if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar){
 493         if(preout==in){
 494             out_count= FFMIN(out_count, in_count); //TODO check at the end if this is needed or redundant
 495             av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
 496             copy(out, in, out_count);
 497             return out_count;
 498         }
 499         else if(preout==postin) preout= midbuf= postin= out;
 500         else if(preout==midbuf) preout= midbuf= out;
 501         else                    preout= out;
 502     }
 503
 504     if(in != postin){
 505         swri_audio_convert(s->in_convert, postin, in, in_count);
 506     }
 507
 508     if(s->resample_first){
 509         if(postin != midbuf)
 510             out_count= resample(s, midbuf, out_count, postin, in_count);
 511         if(midbuf != preout)
 512             swri_rematrix(s, preout, midbuf, out_count, preout==out);
 513     }else{
 514         if(postin != midbuf)
 515             swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
 516         if(midbuf != preout)
 517             out_count= resample(s, preout, out_count, midbuf, in_count);
 518     }
 519
 520     if(preout != out && out_count){
 521         if(s->dither_method){
 522             int ch;
 523             int dither_count= FFMAX(out_count, 1<<16);
 524             av_assert0(preout != in);
 525
 526             if((ret=realloc_audio(&s->dither, dither_count))<0)
 527                 return ret;
 528             if(ret)
 529                 for(ch=0; ch<s->dither.ch_count; ch++)
 530                     swri_get_dither(s->dither.ch[ch], s->dither.count, 12345678913579<<ch, s->out_sample_fmt, s->int_sample_fmt, s->dither_method);
 531             av_assert0(s->dither.ch_count == preout->ch_count);
 532
 533             if(s->dither_pos + out_count > s->dither.count)
 534                 s->dither_pos = 0;
 535             for(ch=0; ch<preout->ch_count; ch++)
 536                 swri_sum2(s->int_sample_fmt, preout->ch[ch], preout->ch[ch], s->dither.ch[ch] + s->dither.bps * s->dither_pos, 1, 1, out_count);
 537
 538             s->dither_pos += out_count;
 539         }
 540 //FIXME packed doesnt need more than 1 chan here!
 541         swri_audio_convert(s->out_convert, out, preout, out_count);
 542     }
 543     return out_count;
 544 }
 545
 546 int swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
 547                                 const uint8_t *in_arg [SWR_CH_MAX], int  in_count){
 548     AudioData * in= &s->in;
 549     AudioData *out= &s->out;
 550
 551     if(!in_arg){
 552         if(s->in_buffer_count){
 553             if (s->resample && !s->flushed) {
 554                 AudioData *a= &s->in_buffer;
 555                 int i, j, ret;
 556                 if((ret=realloc_audio(a, s->in_buffer_index + 2*s->in_buffer_count)) < 0)
 557                     return ret;
 558                 av_assert0(a->planar);
 559                 for(i=0; i<a->ch_count; i++){
 560                     for(j=0; j<s->in_buffer_count; j++){
 561                         memcpy(a->ch[i] + (s->in_buffer_index+s->in_buffer_count+j  )*a->bps,
 562                             a->ch[i] + (s->in_buffer_index+s->in_buffer_count-j-1)*a->bps, a->bps);
 563                     }
 564                 }
 565                 s->in_buffer_count += (s->in_buffer_count+1)/2;
 566                 s->resample_in_constraint = 0;
 567                 s->flushed = 1;
 568             }
 569         }else{
 570             return 0;
 571         }
 572     }else
 573         fill_audiodata(in ,  (void*)in_arg);
 574
 575     fill_audiodata(out, out_arg);
 576
 577     if(s->resample){
 578         return swr_convert_internal(s, out, out_count, in, in_count);
 579     }else{
 580         AudioData tmp= *in;
 581         int ret2=0;
 582         int ret, size;
 583         size = FFMIN(out_count, s->in_buffer_count);
 584         if(size){
 585             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 586             ret= swr_convert_internal(s, out, size, &tmp, size);
 587             if(ret<0)
 588                 return ret;
 589             ret2= ret;
 590             s->in_buffer_count -= ret;
 591             s->in_buffer_index += ret;
 592             buf_set(out, out, ret);
 593             out_count -= ret;
 594             if(!s->in_buffer_count)
 595                 s->in_buffer_index = 0;
 596         }
 597
 598         if(in_count){
 599             size= s->in_buffer_index + s->in_buffer_count + in_count - out_count;
 600
 601             if(in_count > out_count) { //FIXME move after swr_convert_internal
 602                 if(   size > s->in_buffer.count
 603                 && s->in_buffer_count + in_count - out_count <= s->in_buffer_index){
 604                     buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 605                     copy(&s->in_buffer, &tmp, s->in_buffer_count);
 606                     s->in_buffer_index=0;
 607                 }else
 608                     if((ret=realloc_audio(&s->in_buffer, size)) < 0)
 609                         return ret;
 610             }
 611
 612             if(out_count){
 613                 size = FFMIN(in_count, out_count);
 614                 ret= swr_convert_internal(s, out, size, in, size);
 615                 if(ret<0)
 616                     return ret;
 617                 buf_set(in, in, ret);
 618                 in_count -= ret;
 619                 ret2 += ret;
 620             }
 621             if(in_count){
 622                 buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 623                 copy(&tmp, in, in_count);
 624                 s->in_buffer_count += in_count;
 625             }
 626         }
 627         return ret2;
 628     }
 629 }
 630