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