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 #define PARAM AV_OPT_FLAG_AUDIO_PARAM
  39
  40 static const AVOption options[]={
  41 {"ich"                  ,  "Input Channel Count"        , OFFSET( in.ch_count   ), AV_OPT_TYPE_INT  , {.dbl=2                     }, 0      , SWR_CH_MAX, PARAM},
  42 {"in_channel_count"     ,  "Input Channel Count"        , OFFSET( in.ch_count   ), AV_OPT_TYPE_INT  , {.dbl=2                     }, 0      , SWR_CH_MAX, PARAM},
  43 {"och"                  , "Output Channel Count"        , OFFSET(out.ch_count   ), AV_OPT_TYPE_INT  , {.dbl=2                     }, 0      , SWR_CH_MAX, PARAM},
  44 {"out_channel_count"    , "Output Channel Count"        , OFFSET(out.ch_count   ), AV_OPT_TYPE_INT  , {.dbl=2                     }, 0      , SWR_CH_MAX, PARAM},
  45 {"uch"                  ,   "Used Channel Count"        , OFFSET(used_ch_count  ), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , SWR_CH_MAX, PARAM},
  46 {"used_channel_count"   ,   "Used Channel Count"        , OFFSET(used_ch_count  ), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , SWR_CH_MAX, PARAM},
  47 {"isr"                  ,  "Input Sample Rate"          , OFFSET( in_sample_rate), AV_OPT_TYPE_INT  , {.dbl=48000                 }, 1      , INT_MAX   , PARAM},
  48 {"in_sample_rate"       ,  "Input Sample Rate"          , OFFSET( in_sample_rate), AV_OPT_TYPE_INT  , {.dbl=48000                 }, 1      , INT_MAX   , PARAM},
  49 {"osr"                  , "Output Sample Rate"          , OFFSET(out_sample_rate), AV_OPT_TYPE_INT  , {.dbl=48000                 }, 1      , INT_MAX   , PARAM},
  50 {"out_sample_rate"      , "Output Sample Rate"          , OFFSET(out_sample_rate), AV_OPT_TYPE_INT  , {.dbl=48000                 }, 1      , INT_MAX   , PARAM},
  51 {"isf"                  ,    "Input Sample Format"      , OFFSET( in_sample_fmt ), AV_OPT_TYPE_INT  , {.dbl=AV_SAMPLE_FMT_S16     }, 0      , AV_SAMPLE_FMT_NB-1+256, PARAM},
  52 {"in_sample_fmt"        ,    "Input Sample Format"      , OFFSET( in_sample_fmt ), AV_OPT_TYPE_INT  , {.dbl=AV_SAMPLE_FMT_S16     }, 0      , AV_SAMPLE_FMT_NB-1+256, PARAM},
  53 {"osf"                  ,   "Output Sample Format"      , OFFSET(out_sample_fmt ), AV_OPT_TYPE_INT  , {.dbl=AV_SAMPLE_FMT_S16     }, 0      , AV_SAMPLE_FMT_NB-1+256, PARAM},
  54 {"out_sample_fmt"       ,   "Output Sample Format"      , OFFSET(out_sample_fmt ), AV_OPT_TYPE_INT  , {.dbl=AV_SAMPLE_FMT_S16     }, 0      , AV_SAMPLE_FMT_NB-1+256, PARAM},
  55 {"tsf"                  , "Internal Sample Format"      , OFFSET(int_sample_fmt ), AV_OPT_TYPE_INT  , {.dbl=AV_SAMPLE_FMT_NONE    }, -1     , AV_SAMPLE_FMT_FLTP, PARAM},
  56 {"internal_sample_fmt"  , "Internal Sample Format"      , OFFSET(int_sample_fmt ), AV_OPT_TYPE_INT  , {.dbl=AV_SAMPLE_FMT_NONE    }, -1     , AV_SAMPLE_FMT_FLTP, PARAM},
  57 {"icl"                  ,   "Input Channel Layout"      , OFFSET( in_ch_layout  ), AV_OPT_TYPE_INT64, {.dbl=0                     }, 0      , INT64_MAX , PARAM, "channel_layout"},
  58 {"in_channel_layout"    ,   "Input Channel Layout"      , OFFSET( in_ch_layout  ), AV_OPT_TYPE_INT64, {.dbl=0                     }, 0      , INT64_MAX , PARAM, "channel_layout"},
  59 {"ocl"                  ,  "Output Channel Layout"      , OFFSET(out_ch_layout  ), AV_OPT_TYPE_INT64, {.dbl=0                     }, 0      , INT64_MAX , PARAM, "channel_layout"},
  60 {"out_channel_layout"   ,  "Output Channel Layout"      , OFFSET(out_ch_layout  ), AV_OPT_TYPE_INT64, {.dbl=0                     }, 0      , INT64_MAX , PARAM, "channel_layout"},
  61 {"clev"                 ,    "Center Mix Level"         , OFFSET(clev           ), AV_OPT_TYPE_FLOAT, {.dbl=C_30DB                }, -32    , 32        , PARAM},
  62 {"center_mix_level"     ,    "Center Mix Level"         , OFFSET(clev           ), AV_OPT_TYPE_FLOAT, {.dbl=C_30DB                }, -32    , 32        , PARAM},
  63 {"slev"                 , "Sourround Mix Level"         , OFFSET(slev           ), AV_OPT_TYPE_FLOAT, {.dbl=C_30DB                }, -32    , 32        , PARAM},
  64 {"surround_mix_level"   , "Sourround Mix Level"         , OFFSET(slev           ), AV_OPT_TYPE_FLOAT, {.dbl=C_30DB                }, -32    , 32        , PARAM},
  65 {"rmvol"                , "Rematrix Volume"             , OFFSET(rematrix_volume), AV_OPT_TYPE_FLOAT, {.dbl=1.0                   }, -1000  , 1000      , PARAM},
  66 {"rematrix_volume"      , "Rematrix Volume"             , OFFSET(rematrix_volume), AV_OPT_TYPE_FLOAT, {.dbl=1.0                   }, -1000  , 1000      , PARAM},
  67 {"flags"                , NULL                          , OFFSET(flags          ), AV_OPT_TYPE_FLAGS, {.dbl=0                     }, 0      , UINT_MAX  , PARAM, "flags"},
  68 {"swr_flags"            , NULL                          , OFFSET(flags          ), AV_OPT_TYPE_FLAGS, {.dbl=0                     }, 0      , UINT_MAX  , PARAM, "flags"},
  69 {"res"                  , "Force Resampling"            , 0                      , AV_OPT_TYPE_CONST, {.dbl=SWR_FLAG_RESAMPLE     }, INT_MIN, INT_MAX   , PARAM, "flags"},
  70 {"dither_scale"         , "Dither Scale"                , OFFSET(dither_scale   ), AV_OPT_TYPE_FLOAT, {.dbl=1                     }, 0      , INT_MAX   , PARAM},
  71 {"dither_method"        , "Dither Method"               , OFFSET(dither_method  ), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , SWR_DITHER_NB-1, PARAM, "dither_method"},
  72 {"rectangular"          , "Rectangular Dither"          , 0                      , AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_RECTANGULAR}, INT_MIN, INT_MAX   , PARAM, "dither_method"},
  73 {"triangular"           ,  "Triangular Dither"          , 0                      , AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_TRIANGULAR }, INT_MIN, INT_MAX   , PARAM, "dither_method"},
  74 {"triangular_hp"        , "Triangular Dither With High Pass" , 0                 , AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_TRIANGULAR_HIGHPASS }, INT_MIN, INT_MAX, PARAM, "dither_method"},
  75 {"filter_size"          , "Resampling Filter Size"      , OFFSET(filter_size)    , AV_OPT_TYPE_INT  , {.dbl=16                    }, 0      , INT_MAX   , PARAM },
  76 {"phase_shift"          , "Resampling Phase Shift"      , OFFSET(phase_shift)    , AV_OPT_TYPE_INT  , {.dbl=10                    }, 0      , 30        , PARAM },
  77 {"linear_interp"        , "Use Linear Interpolation"    , OFFSET(linear_interp)  , AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , 1         , PARAM },
  78 {"cutoff"               , "Cutoff Frequency Ratio"      , OFFSET(cutoff)         , AV_OPT_TYPE_DOUBLE,{.dbl=0.8                   }, 0      , 1         , PARAM },
  79 {0}
  80 };
  81
  82 static const char* context_to_name(void* ptr) {
  83     return "SWR";
  84 }
  85
  86 static const AVClass av_class = {
  87     .class_name                = "SwrContext",
  88     .item_name                 = context_to_name,
  89     .option                    = options,
  90     .version                   = LIBAVUTIL_VERSION_INT,
  91     .log_level_offset_offset   = OFFSET(log_level_offset),
  92     .parent_log_context_offset = OFFSET(log_ctx),
  93 };
  94
  95 unsigned swresample_version(void)
  96 {
  97     av_assert0(LIBSWRESAMPLE_VERSION_MICRO >= 100);
  98     return LIBSWRESAMPLE_VERSION_INT;
  99 }
 100
 101 const char *swresample_configuration(void)
 102 {
 103     return FFMPEG_CONFIGURATION;
 104 }
 105
 106 const char *swresample_license(void)
 107 {
 108 #define LICENSE_PREFIX "libswresample license: "
 109     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
 110 }
 111
 112 int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map){
 113     if(!s || s->in_convert) // s needs to be allocated but not initialized
 114         return AVERROR(EINVAL);
 115     s->channel_map = channel_map;
 116     return 0;
 117 }
 118
 119 const AVClass *swr_get_class(void)
 120 {
 121     return &av_class;
 122 }
 123
 124 struct SwrContext *swr_alloc(void){
 125     SwrContext *s= av_mallocz(sizeof(SwrContext));
 126     if(s){
 127         s->av_class= &av_class;
 128         av_opt_set_defaults(s);
 129     }
 130     return s;
 131 }
 132
 133 struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
 134                                       int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
 135                                       int64_t  in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
 136                                       int log_offset, void *log_ctx){
 137     if(!s) s= swr_alloc();
 138     if(!s) return NULL;
 139
 140     s->log_level_offset= log_offset;
 141     s->log_ctx= log_ctx;
 142
 143     av_opt_set_int(s, "ocl", out_ch_layout,   0);
 144     av_opt_set_int(s, "osf", out_sample_fmt,  0);
 145     av_opt_set_int(s, "osr", out_sample_rate, 0);
 146     av_opt_set_int(s, "icl", in_ch_layout,    0);
 147     av_opt_set_int(s, "isf", in_sample_fmt,   0);
 148     av_opt_set_int(s, "isr", in_sample_rate,  0);
 149     av_opt_set_int(s, "tsf", AV_SAMPLE_FMT_NONE,   0);
 150     av_opt_set_int(s, "ich", av_get_channel_layout_nb_channels(s-> in_ch_layout), 0);
 151     av_opt_set_int(s, "och", av_get_channel_layout_nb_channels(s->out_ch_layout), 0);
 152     av_opt_set_int(s, "uch", 0, 0);
 153     return s;
 154 }
 155
 156 static void set_audiodata_fmt(AudioData *a, enum AVSampleFormat fmt){
 157     a->fmt   = fmt;
 158     a->bps   = av_get_bytes_per_sample(fmt);
 159     a->planar= av_sample_fmt_is_planar(fmt);
 160 }
 161
 162 static void free_temp(AudioData *a){
 163     av_free(a->data);
 164     memset(a, 0, sizeof(*a));
 165 }
 166
 167 void swr_free(SwrContext **ss){
 168     SwrContext *s= *ss;
 169     if(s){
 170         free_temp(&s->postin);
 171         free_temp(&s->midbuf);
 172         free_temp(&s->preout);
 173         free_temp(&s->in_buffer);
 174         free_temp(&s->dither);
 175         swri_audio_convert_free(&s-> in_convert);
 176         swri_audio_convert_free(&s->out_convert);
 177         swri_audio_convert_free(&s->full_convert);
 178         swri_resample_free(&s->resample);
 179         swri_rematrix_free(s);
 180     }
 181
 182     av_freep(ss);
 183 }
 184
 185 int swr_init(struct SwrContext *s){
 186     s->in_buffer_index= 0;
 187     s->in_buffer_count= 0;
 188     s->resample_in_constraint= 0;
 189     free_temp(&s->postin);
 190     free_temp(&s->midbuf);
 191     free_temp(&s->preout);
 192     free_temp(&s->in_buffer);
 193     free_temp(&s->dither);
 194     swri_audio_convert_free(&s-> in_convert);
 195     swri_audio_convert_free(&s->out_convert);
 196     swri_audio_convert_free(&s->full_convert);
 197     swri_rematrix_free(s);
 198
 199     s->flushed = 0;
 200
 201     if(s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
 202         av_log(s, AV_LOG_ERROR, "Requested input sample format %d is invalid\n", s->in_sample_fmt);
 203         return AVERROR(EINVAL);
 204     }
 205     if(s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
 206         av_log(s, AV_LOG_ERROR, "Requested output sample format %d is invalid\n", s->out_sample_fmt);
 207         return AVERROR(EINVAL);
 208     }
 209
 210     //FIXME should we allow/support using FLT on material that doesnt need it ?
 211     if(av_get_planar_sample_fmt(s->in_sample_fmt) <= AV_SAMPLE_FMT_S16P || s->int_sample_fmt==AV_SAMPLE_FMT_S16P){
 212         s->int_sample_fmt= AV_SAMPLE_FMT_S16P;
 213     }else
 214         s->int_sample_fmt= AV_SAMPLE_FMT_FLTP;
 215
 216     if(   s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 217         &&s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 218         &&s->int_sample_fmt != AV_SAMPLE_FMT_FLTP){
 219         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));
 220         return AVERROR(EINVAL);
 221     }
 222
 223     set_audiodata_fmt(&s-> in, s-> in_sample_fmt);
 224     set_audiodata_fmt(&s->out, s->out_sample_fmt);
 225
 226     if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
 227         s->resample = swri_resample_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);
 228     }else
 229         swri_resample_free(&s->resample);
 230     if(    s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 231         && s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 232         && s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
 233         && s->resample){
 234         av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16/s32/flt\n");
 235         return -1;
 236     }
 237
 238     if(!s->used_ch_count)
 239         s->used_ch_count= s->in.ch_count;
 240
 241     if(s->used_ch_count && s-> in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s-> in_ch_layout)){
 242         av_log(s, AV_LOG_WARNING, "Input channel layout has a different number of channels than the number of used channels, ignoring layout\n");
 243         s-> in_ch_layout= 0;
 244     }
 245
 246     if(!s-> in_ch_layout)
 247         s-> in_ch_layout= av_get_default_channel_layout(s->used_ch_count);
 248     if(!s->out_ch_layout)
 249         s->out_ch_layout= av_get_default_channel_layout(s->out.ch_count);
 250
 251     s->rematrix= s->out_ch_layout  !=s->in_ch_layout || s->rematrix_volume!=1.0 ||
 252                  s->rematrix_custom;
 253
 254 #define RSC 1 //FIXME finetune
 255     if(!s-> in.ch_count)
 256         s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
 257     if(!s->used_ch_count)
 258         s->used_ch_count= s->in.ch_count;
 259     if(!s->out.ch_count)
 260         s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
 261
 262     if(!s-> in.ch_count){
 263         av_assert0(!s->in_ch_layout);
 264         av_log(s, AV_LOG_ERROR, "Input channel count and layout are unset\n");
 265         return -1;
 266     }
 267
 268     if ((!s->out_ch_layout || !s->in_ch_layout) && s->used_ch_count != s->out.ch_count && !s->rematrix_custom) {
 269         av_log(s, AV_LOG_ERROR, "Rematrix is needed but there is not enough information to do it\n");
 270         return -1;
 271     }
 272
 273 av_assert0(s->used_ch_count);
 274 av_assert0(s->out.ch_count);
 275     s->resample_first= RSC*s->out.ch_count/s->in.ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;
 276
 277     s->in_buffer= s->in;
 278
 279     if(!s->resample && !s->rematrix && !s->channel_map && !s->dither_method){
 280         s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt,
 281                                                    s-> in_sample_fmt, s-> in.ch_count, NULL, 0);
 282         return 0;
 283     }
 284
 285     s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt,
 286                                              s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0);
 287     s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt,
 288                                              s->int_sample_fmt, s->out.ch_count, NULL, 0);
 289
 290
 291     s->postin= s->in;
 292     s->preout= s->out;
 293     s->midbuf= s->in;
 294
 295     if(s->channel_map){
 296         s->postin.ch_count=
 297         s->midbuf.ch_count= s->used_ch_count;
 298         if(s->resample)
 299             s->in_buffer.ch_count= s->used_ch_count;
 300     }
 301     if(!s->resample_first){
 302         s->midbuf.ch_count= s->out.ch_count;
 303         if(s->resample)
 304             s->in_buffer.ch_count = s->out.ch_count;
 305     }
 306
 307     set_audiodata_fmt(&s->postin, s->int_sample_fmt);
 308     set_audiodata_fmt(&s->midbuf, s->int_sample_fmt);
 309     set_audiodata_fmt(&s->preout, s->int_sample_fmt);
 310
 311     if(s->resample){
 312         set_audiodata_fmt(&s->in_buffer, s->int_sample_fmt);
 313     }
 314
 315     s->dither = s->preout;
 316
 317     if(s->rematrix || s->dither_method)
 318         return swri_rematrix_init(s);
 319
 320     return 0;
 321 }
 322
 323 static int realloc_audio(AudioData *a, int count){
 324     int i, countb;
 325     AudioData old;
 326
 327     if(a->count >= count)
 328         return 0;
 329
 330     count*=2;
 331
 332     countb= FFALIGN(count*a->bps, 32);
 333     old= *a;
 334
 335     av_assert0(a->bps);
 336     av_assert0(a->ch_count);
 337
 338     a->data= av_malloc(countb*a->ch_count);
 339     if(!a->data)
 340         return AVERROR(ENOMEM);
 341     for(i=0; i<a->ch_count; i++){
 342         a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
 343         if(a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
 344     }
 345     if(!a->planar) memcpy(a->ch[0], old.ch[0], a->count*a->ch_count*a->bps);
 346     av_free(old.data);
 347     a->count= count;
 348
 349     return 1;
 350 }
 351
 352 static void copy(AudioData *out, AudioData *in,
 353                  int count){
 354     av_assert0(out->planar == in->planar);
 355     av_assert0(out->bps == in->bps);
 356     av_assert0(out->ch_count == in->ch_count);
 357     if(out->planar){
 358         int ch;
 359         for(ch=0; ch<out->ch_count; ch++)
 360             memcpy(out->ch[ch], in->ch[ch], count*out->bps);
 361     }else
 362         memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
 363 }
 364
 365 static void fill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 366     int i;
 367     if(out->planar){
 368         for(i=0; i<out->ch_count; i++)
 369             out->ch[i]= in_arg[i];
 370     }else{
 371         for(i=0; i<out->ch_count; i++)
 372             out->ch[i]= in_arg[0] + i*out->bps;
 373     }
 374 }
 375
 376 /**
 377  *
 378  * out may be equal in.
 379  */
 380 static void buf_set(AudioData *out, AudioData *in, int count){
 381     int ch;
 382     if(in->planar){
 383         for(ch=0; ch<out->ch_count; ch++)
 384             out->ch[ch]= in->ch[ch] + count*out->bps;
 385     }else{
 386         for(ch=0; ch<out->ch_count; ch++)
 387             out->ch[ch]= in->ch[0] + (ch + count*out->ch_count) * out->bps;
 388     }
 389 }
 390
 391 /**
 392  *
 393  * @return number of samples output per channel
 394  */
 395 static int resample(SwrContext *s, AudioData *out_param, int out_count,
 396                              const AudioData * in_param, int in_count){
 397     AudioData in, out, tmp;
 398     int ret_sum=0;
 399     int border=0;
 400
 401     tmp=out=*out_param;
 402     in =  *in_param;
 403
 404     do{
 405         int ret, size, consumed;
 406         if(!s->resample_in_constraint && s->in_buffer_count){
 407             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 408             ret= swri_multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
 409             out_count -= ret;
 410             ret_sum += ret;
 411             buf_set(&out, &out, ret);
 412             s->in_buffer_count -= consumed;
 413             s->in_buffer_index += consumed;
 414
 415             if(!in_count)
 416                 break;
 417             if(s->in_buffer_count <= border){
 418                 buf_set(&in, &in, -s->in_buffer_count);
 419                 in_count += s->in_buffer_count;
 420                 s->in_buffer_count=0;
 421                 s->in_buffer_index=0;
 422                 border = 0;
 423             }
 424         }
 425
 426         if(in_count && !s->in_buffer_count){
 427             s->in_buffer_index=0;
 428             ret= swri_multiple_resample(s->resample, &out, out_count, &in, in_count, &consumed);
 429             out_count -= ret;
 430             ret_sum += ret;
 431             buf_set(&out, &out, ret);
 432             in_count -= consumed;
 433             buf_set(&in, &in, consumed);
 434         }
 435
 436         //TODO is this check sane considering the advanced copy avoidance below
 437         size= s->in_buffer_index + s->in_buffer_count + in_count;
 438         if(   size > s->in_buffer.count
 439            && s->in_buffer_count + in_count <= s->in_buffer_index){
 440             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 441             copy(&s->in_buffer, &tmp, s->in_buffer_count);
 442             s->in_buffer_index=0;
 443         }else
 444             if((ret=realloc_audio(&s->in_buffer, size)) < 0)
 445                 return ret;
 446
 447         if(in_count){
 448             int count= in_count;
 449             if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;
 450
 451             buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 452             copy(&tmp, &in, /*in_*/count);
 453             s->in_buffer_count += count;
 454             in_count -= count;
 455             border += count;
 456             buf_set(&in, &in, count);
 457             s->resample_in_constraint= 0;
 458             if(s->in_buffer_count != count || in_count)
 459                 continue;
 460         }
 461         break;
 462     }while(1);
 463
 464     s->resample_in_constraint= !!out_count;
 465
 466     return ret_sum;
 467 }
 468
 469 static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_count,
 470                                                       AudioData *in , int  in_count){
 471     AudioData *postin, *midbuf, *preout;
 472     int ret/*, in_max*/;
 473     AudioData preout_tmp, midbuf_tmp;
 474
 475     if(s->full_convert){
 476         av_assert0(!s->resample);
 477         swri_audio_convert(s->full_convert, out, in, in_count);
 478         return out_count;
 479     }
 480
 481 //     in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
 482 //     in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);
 483
 484     if((ret=realloc_audio(&s->postin, in_count))<0)
 485         return ret;
 486     if(s->resample_first){
 487         av_assert0(s->midbuf.ch_count == s->used_ch_count);
 488         if((ret=realloc_audio(&s->midbuf, out_count))<0)
 489             return ret;
 490     }else{
 491         av_assert0(s->midbuf.ch_count ==  s->out.ch_count);
 492         if((ret=realloc_audio(&s->midbuf,  in_count))<0)
 493             return ret;
 494     }
 495     if((ret=realloc_audio(&s->preout, out_count))<0)
 496         return ret;
 497
 498     postin= &s->postin;
 499
 500     midbuf_tmp= s->midbuf;
 501     midbuf= &midbuf_tmp;
 502     preout_tmp= s->preout;
 503     preout= &preout_tmp;
 504
 505     if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar)
 506         postin= in;
 507
 508     if(s->resample_first ? !s->resample : !s->rematrix)
 509         midbuf= postin;
 510
 511     if(s->resample_first ? !s->rematrix : !s->resample)
 512         preout= midbuf;
 513
 514     if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar){
 515         if(preout==in){
 516             out_count= FFMIN(out_count, in_count); //TODO check at the end if this is needed or redundant
 517             av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
 518             copy(out, in, out_count);
 519             return out_count;
 520         }
 521         else if(preout==postin) preout= midbuf= postin= out;
 522         else if(preout==midbuf) preout= midbuf= out;
 523         else                    preout= out;
 524     }
 525
 526     if(in != postin){
 527         swri_audio_convert(s->in_convert, postin, in, in_count);
 528     }
 529
 530     if(s->resample_first){
 531         if(postin != midbuf)
 532             out_count= resample(s, midbuf, out_count, postin, in_count);
 533         if(midbuf != preout)
 534             swri_rematrix(s, preout, midbuf, out_count, preout==out);
 535     }else{
 536         if(postin != midbuf)
 537             swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
 538         if(midbuf != preout)
 539             out_count= resample(s, preout, out_count, midbuf, in_count);
 540     }
 541
 542     if(preout != out && out_count){
 543         if(s->dither_method){
 544             int ch;
 545             int dither_count= FFMAX(out_count, 1<<16);
 546             av_assert0(preout != in);
 547
 548             if((ret=realloc_audio(&s->dither, dither_count))<0)
 549                 return ret;
 550             if(ret)
 551                 for(ch=0; ch<s->dither.ch_count; ch++)
 552                     swri_get_dither(s, s->dither.ch[ch], s->dither.count, 12345678913579<<ch, s->out_sample_fmt, s->int_sample_fmt);
 553             av_assert0(s->dither.ch_count == preout->ch_count);
 554
 555             if(s->dither_pos + out_count > s->dither.count)
 556                 s->dither_pos = 0;
 557
 558             for(ch=0; ch<preout->ch_count; ch++)
 559                 s->mix_2_1_f(preout->ch[ch], preout->ch[ch], s->dither.ch[ch] + s->dither.bps * s->dither_pos, s->native_one, 0, 0, out_count);
 560
 561             s->dither_pos += out_count;
 562         }
 563 //FIXME packed doesnt need more than 1 chan here!
 564         swri_audio_convert(s->out_convert, out, preout, out_count);
 565     }
 566     return out_count;
 567 }
 568
 569 int swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
 570                                 const uint8_t *in_arg [SWR_CH_MAX], int  in_count){
 571     AudioData * in= &s->in;
 572     AudioData *out= &s->out;
 573
 574     if(!in_arg){
 575         if(s->in_buffer_count){
 576             if (s->resample && !s->flushed) {
 577                 AudioData *a= &s->in_buffer;
 578                 int i, j, ret;
 579                 if((ret=realloc_audio(a, s->in_buffer_index + 2*s->in_buffer_count)) < 0)
 580                     return ret;
 581                 av_assert0(a->planar);
 582                 for(i=0; i<a->ch_count; i++){
 583                     for(j=0; j<s->in_buffer_count; j++){
 584                         memcpy(a->ch[i] + (s->in_buffer_index+s->in_buffer_count+j  )*a->bps,
 585                             a->ch[i] + (s->in_buffer_index+s->in_buffer_count-j-1)*a->bps, a->bps);
 586                     }
 587                 }
 588                 s->in_buffer_count += (s->in_buffer_count+1)/2;
 589                 s->resample_in_constraint = 0;
 590                 s->flushed = 1;
 591             }
 592         }else{
 593             return 0;
 594         }
 595     }else
 596         fill_audiodata(in ,  (void*)in_arg);
 597
 598     fill_audiodata(out, out_arg);
 599
 600     if(s->resample){
 601         return swr_convert_internal(s, out, out_count, in, in_count);
 602     }else{
 603         AudioData tmp= *in;
 604         int ret2=0;
 605         int ret, size;
 606         size = FFMIN(out_count, s->in_buffer_count);
 607         if(size){
 608             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 609             ret= swr_convert_internal(s, out, size, &tmp, size);
 610             if(ret<0)
 611                 return ret;
 612             ret2= ret;
 613             s->in_buffer_count -= ret;
 614             s->in_buffer_index += ret;
 615             buf_set(out, out, ret);
 616             out_count -= ret;
 617             if(!s->in_buffer_count)
 618                 s->in_buffer_index = 0;
 619         }
 620
 621         if(in_count){
 622             size= s->in_buffer_index + s->in_buffer_count + in_count - out_count;
 623
 624             if(in_count > out_count) { //FIXME move after swr_convert_internal
 625                 if(   size > s->in_buffer.count
 626                 && s->in_buffer_count + in_count - out_count <= s->in_buffer_index){
 627                     buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 628                     copy(&s->in_buffer, &tmp, s->in_buffer_count);
 629                     s->in_buffer_index=0;
 630                 }else
 631                     if((ret=realloc_audio(&s->in_buffer, size)) < 0)
 632                         return ret;
 633             }
 634
 635             if(out_count){
 636                 size = FFMIN(in_count, out_count);
 637                 ret= swr_convert_internal(s, out, size, in, size);
 638                 if(ret<0)
 639                     return ret;
 640                 buf_set(in, in, ret);
 641                 in_count -= ret;
 642                 ret2 += ret;
 643             }
 644             if(in_count){
 645                 buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 646                 copy(&tmp, in, in_count);
 647                 s->in_buffer_count += in_count;
 648             }
 649         }
 650         return ret2;
 651     }
 652 }
 653