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
 157 static void free_temp(AudioData *a){
 158     av_free(a->data);
 159     memset(a, 0, sizeof(*a));
 160 }
 161
 162 void swr_free(SwrContext **ss){
 163     SwrContext *s= *ss;
 164     if(s){
 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         swri_resample_free(&s->resample);
 174     }
 175
 176     av_freep(ss);
 177 }
 178
 179 int swr_init(struct SwrContext *s){
 180     s->in_buffer_index= 0;
 181     s->in_buffer_count= 0;
 182     s->resample_in_constraint= 0;
 183     free_temp(&s->postin);
 184     free_temp(&s->midbuf);
 185     free_temp(&s->preout);
 186     free_temp(&s->in_buffer);
 187     free_temp(&s->dither);
 188     swri_audio_convert_free(&s-> in_convert);
 189     swri_audio_convert_free(&s->out_convert);
 190     swri_audio_convert_free(&s->full_convert);
 191
 192     s->flushed = 0;
 193
 194     s-> in.planar= av_sample_fmt_is_planar(s-> in_sample_fmt);
 195     s->out.planar= av_sample_fmt_is_planar(s->out_sample_fmt);
 196
 197     if(s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
 198         av_log(s, AV_LOG_ERROR, "Requested input sample format %d is invalid\n", s->in_sample_fmt);
 199         return AVERROR(EINVAL);
 200     }
 201     if(s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
 202         av_log(s, AV_LOG_ERROR, "Requested output sample format %d is invalid\n", s->out_sample_fmt);
 203         return AVERROR(EINVAL);
 204     }
 205
 206     //FIXME should we allow/support using FLT on material that doesnt need it ?
 207     if(av_get_planar_sample_fmt(s->in_sample_fmt) <= AV_SAMPLE_FMT_S16P || s->int_sample_fmt==AV_SAMPLE_FMT_S16P){
 208         s->int_sample_fmt= AV_SAMPLE_FMT_S16P;
 209     }else
 210         s->int_sample_fmt= AV_SAMPLE_FMT_FLTP;
 211
 212     if(   s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 213         &&s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 214         &&s->int_sample_fmt != AV_SAMPLE_FMT_FLTP){
 215         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));
 216         return AVERROR(EINVAL);
 217     }
 218
 219     if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
 220         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);
 221     }else
 222         swri_resample_free(&s->resample);
 223     if(    s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 224         && s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 225         && s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
 226         && s->resample){
 227         av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16/s32/flt\n");
 228         return -1;
 229     }
 230
 231     if(!s->used_ch_count)
 232         s->used_ch_count= s->in.ch_count;
 233
 234     if(s->used_ch_count && s-> in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s-> in_ch_layout)){
 235         av_log(s, AV_LOG_WARNING, "Input channel layout has a different number of channels than the number of used channels, ignoring layout\n");
 236         s-> in_ch_layout= 0;
 237     }
 238
 239     if(!s-> in_ch_layout)
 240         s-> in_ch_layout= av_get_default_channel_layout(s->used_ch_count);
 241     if(!s->out_ch_layout)
 242         s->out_ch_layout= av_get_default_channel_layout(s->out.ch_count);
 243
 244     s->rematrix= s->out_ch_layout  !=s->in_ch_layout || s->rematrix_volume!=1.0 ||
 245                  s->rematrix_custom;
 246
 247 #define RSC 1 //FIXME finetune
 248     if(!s-> in.ch_count)
 249         s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
 250     if(!s->used_ch_count)
 251         s->used_ch_count= s->in.ch_count;
 252     if(!s->out.ch_count)
 253         s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
 254
 255     if(!s-> in.ch_count){
 256         av_assert0(!s->in_ch_layout);
 257         av_log(s, AV_LOG_ERROR, "Input channel count and layout are unset\n");
 258         return -1;
 259     }
 260
 261     if ((!s->out_ch_layout || !s->in_ch_layout) && s->used_ch_count != s->out.ch_count && !s->rematrix_custom) {
 262         av_log(s, AV_LOG_ERROR, "Rematrix is needed but there is not enough information to do it\n");
 263         return -1;
 264     }
 265
 266 av_assert0(s->used_ch_count);
 267 av_assert0(s->out.ch_count);
 268     s->resample_first= RSC*s->out.ch_count/s->in.ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;
 269
 270     s-> in.bps= av_get_bytes_per_sample(s-> in_sample_fmt);
 271     s->int_bps= av_get_bytes_per_sample(s->int_sample_fmt);
 272     s->out.bps= av_get_bytes_per_sample(s->out_sample_fmt);
 273     s->in_buffer= s->in;
 274
 275     if(!s->resample && !s->rematrix && !s->channel_map){
 276         s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt,
 277                                                    s-> in_sample_fmt, s-> in.ch_count, NULL, 0);
 278         return 0;
 279     }
 280
 281     s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt,
 282                                              s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0);
 283     s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt,
 284                                              s->int_sample_fmt, s->out.ch_count, NULL, 0);
 285
 286
 287     s->postin= s->in;
 288     s->preout= s->out;
 289     s->midbuf= s->in;
 290
 291     if(s->channel_map){
 292         s->postin.ch_count=
 293         s->midbuf.ch_count= s->used_ch_count;
 294         if(s->resample)
 295             s->in_buffer.ch_count= s->used_ch_count;
 296     }
 297     if(!s->resample_first){
 298         s->midbuf.ch_count= s->out.ch_count;
 299         if(s->resample)
 300             s->in_buffer.ch_count = s->out.ch_count;
 301     }
 302
 303     s->postin.bps    = s->midbuf.bps    = s->preout.bps    =  s->int_bps;
 304     s->postin.planar = s->midbuf.planar = s->preout.planar =  1;
 305
 306     if(s->resample){
 307         s->in_buffer.bps    = s->int_bps;
 308         s->in_buffer.planar = 1;
 309     }
 310
 311     s->dither = s->preout;
 312
 313     if(s->rematrix)
 314         return swri_rematrix_init(s);
 315
 316     return 0;
 317 }
 318
 319 static int realloc_audio(AudioData *a, int count){
 320     int i, countb;
 321     AudioData old;
 322
 323     if(a->count >= count)
 324         return 0;
 325
 326     count*=2;
 327
 328     countb= FFALIGN(count*a->bps, 32);
 329     old= *a;
 330
 331     av_assert0(a->bps);
 332     av_assert0(a->ch_count);
 333
 334     a->data= av_malloc(countb*a->ch_count);
 335     if(!a->data)
 336         return AVERROR(ENOMEM);
 337     for(i=0; i<a->ch_count; i++){
 338         a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
 339         if(a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
 340     }
 341     if(!a->planar) memcpy(a->ch[0], old.ch[0], a->count*a->ch_count*a->bps);
 342     av_free(old.data);
 343     a->count= count;
 344
 345     return 1;
 346 }
 347
 348 static void copy(AudioData *out, AudioData *in,
 349                  int count){
 350     av_assert0(out->planar == in->planar);
 351     av_assert0(out->bps == in->bps);
 352     av_assert0(out->ch_count == in->ch_count);
 353     if(out->planar){
 354         int ch;
 355         for(ch=0; ch<out->ch_count; ch++)
 356             memcpy(out->ch[ch], in->ch[ch], count*out->bps);
 357     }else
 358         memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
 359 }
 360
 361 static void fill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 362     int i;
 363     if(out->planar){
 364         for(i=0; i<out->ch_count; i++)
 365             out->ch[i]= in_arg[i];
 366     }else{
 367         for(i=0; i<out->ch_count; i++)
 368             out->ch[i]= in_arg[0] + i*out->bps;
 369     }
 370 }
 371
 372 /**
 373  *
 374  * out may be equal in.
 375  */
 376 static void buf_set(AudioData *out, AudioData *in, int count){
 377     int ch;
 378     if(in->planar){
 379         for(ch=0; ch<out->ch_count; ch++)
 380             out->ch[ch]= in->ch[ch] + count*out->bps;
 381     }else{
 382         for(ch=0; ch<out->ch_count; ch++)
 383             out->ch[ch]= in->ch[0] + (ch + count*out->ch_count) * out->bps;
 384     }
 385 }
 386
 387 /**
 388  *
 389  * @return number of samples output per channel
 390  */
 391 static int resample(SwrContext *s, AudioData *out_param, int out_count,
 392                              const AudioData * in_param, int in_count){
 393     AudioData in, out, tmp;
 394     int ret_sum=0;
 395     int border=0;
 396
 397     tmp=out=*out_param;
 398     in =  *in_param;
 399
 400     do{
 401         int ret, size, consumed;
 402         if(!s->resample_in_constraint && s->in_buffer_count){
 403             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 404             ret= swri_multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
 405             out_count -= ret;
 406             ret_sum += ret;
 407             buf_set(&out, &out, ret);
 408             s->in_buffer_count -= consumed;
 409             s->in_buffer_index += consumed;
 410
 411             if(!in_count)
 412                 break;
 413             if(s->in_buffer_count <= border){
 414                 buf_set(&in, &in, -s->in_buffer_count);
 415                 in_count += s->in_buffer_count;
 416                 s->in_buffer_count=0;
 417                 s->in_buffer_index=0;
 418                 border = 0;
 419             }
 420         }
 421
 422         if(in_count && !s->in_buffer_count){
 423             s->in_buffer_index=0;
 424             ret= swri_multiple_resample(s->resample, &out, out_count, &in, in_count, &consumed);
 425             out_count -= ret;
 426             ret_sum += ret;
 427             buf_set(&out, &out, ret);
 428             in_count -= consumed;
 429             buf_set(&in, &in, consumed);
 430         }
 431
 432         //TODO is this check sane considering the advanced copy avoidance below
 433         size= s->in_buffer_index + s->in_buffer_count + in_count;
 434         if(   size > s->in_buffer.count
 435            && s->in_buffer_count + in_count <= s->in_buffer_index){
 436             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 437             copy(&s->in_buffer, &tmp, s->in_buffer_count);
 438             s->in_buffer_index=0;
 439         }else
 440             if((ret=realloc_audio(&s->in_buffer, size)) < 0)
 441                 return ret;
 442
 443         if(in_count){
 444             int count= in_count;
 445             if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;
 446
 447             buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 448             copy(&tmp, &in, /*in_*/count);
 449             s->in_buffer_count += count;
 450             in_count -= count;
 451             border += count;
 452             buf_set(&in, &in, count);
 453             s->resample_in_constraint= 0;
 454             if(s->in_buffer_count != count || in_count)
 455                 continue;
 456         }
 457         break;
 458     }while(1);
 459
 460     s->resample_in_constraint= !!out_count;
 461
 462     return ret_sum;
 463 }
 464
 465 static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_count,
 466                                                       AudioData *in , int  in_count){
 467     AudioData *postin, *midbuf, *preout;
 468     int ret/*, in_max*/;
 469     AudioData preout_tmp, midbuf_tmp;
 470
 471     if(s->full_convert){
 472         av_assert0(!s->resample);
 473         swri_audio_convert(s->full_convert, out, in, in_count);
 474         return out_count;
 475     }
 476
 477 //     in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
 478 //     in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);
 479
 480     if((ret=realloc_audio(&s->postin, in_count))<0)
 481         return ret;
 482     if(s->resample_first){
 483         av_assert0(s->midbuf.ch_count == s->used_ch_count);
 484         if((ret=realloc_audio(&s->midbuf, out_count))<0)
 485             return ret;
 486     }else{
 487         av_assert0(s->midbuf.ch_count ==  s->out.ch_count);
 488         if((ret=realloc_audio(&s->midbuf,  in_count))<0)
 489             return ret;
 490     }
 491     if((ret=realloc_audio(&s->preout, out_count))<0)
 492         return ret;
 493
 494     postin= &s->postin;
 495
 496     midbuf_tmp= s->midbuf;
 497     midbuf= &midbuf_tmp;
 498     preout_tmp= s->preout;
 499     preout= &preout_tmp;
 500
 501     if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar)
 502         postin= in;
 503
 504     if(s->resample_first ? !s->resample : !s->rematrix)
 505         midbuf= postin;
 506
 507     if(s->resample_first ? !s->rematrix : !s->resample)
 508         preout= midbuf;
 509
 510     if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar){
 511         if(preout==in){
 512             out_count= FFMIN(out_count, in_count); //TODO check at the end if this is needed or redundant
 513             av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
 514             copy(out, in, out_count);
 515             return out_count;
 516         }
 517         else if(preout==postin) preout= midbuf= postin= out;
 518         else if(preout==midbuf) preout= midbuf= out;
 519         else                    preout= out;
 520     }
 521
 522     if(in != postin){
 523         swri_audio_convert(s->in_convert, postin, in, in_count);
 524     }
 525
 526     if(s->resample_first){
 527         if(postin != midbuf)
 528             out_count= resample(s, midbuf, out_count, postin, in_count);
 529         if(midbuf != preout)
 530             swri_rematrix(s, preout, midbuf, out_count, preout==out);
 531     }else{
 532         if(postin != midbuf)
 533             swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
 534         if(midbuf != preout)
 535             out_count= resample(s, preout, out_count, midbuf, in_count);
 536     }
 537
 538     if(preout != out && out_count){
 539         if(s->dither_method){
 540             int ch;
 541             int dither_count= FFMAX(out_count, 1<<16);
 542             av_assert0(preout != in);
 543
 544             if((ret=realloc_audio(&s->dither, dither_count))<0)
 545                 return ret;
 546             if(ret)
 547                 for(ch=0; ch<s->dither.ch_count; ch++)
 548                     swri_get_dither(s, s->dither.ch[ch], s->dither.count, 12345678913579<<ch, s->out_sample_fmt, s->int_sample_fmt);
 549             av_assert0(s->dither.ch_count == preout->ch_count);
 550
 551             if(s->dither_pos + out_count > s->dither.count)
 552                 s->dither_pos = 0;
 553             for(ch=0; ch<preout->ch_count; ch++)
 554                 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);
 555
 556             s->dither_pos += out_count;
 557         }
 558 //FIXME packed doesnt need more than 1 chan here!
 559         swri_audio_convert(s->out_convert, out, preout, out_count);
 560     }
 561     return out_count;
 562 }
 563
 564 int swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
 565                                 const uint8_t *in_arg [SWR_CH_MAX], int  in_count){
 566     AudioData * in= &s->in;
 567     AudioData *out= &s->out;
 568
 569     if(!in_arg){
 570         if(s->in_buffer_count){
 571             if (s->resample && !s->flushed) {
 572                 AudioData *a= &s->in_buffer;
 573                 int i, j, ret;
 574                 if((ret=realloc_audio(a, s->in_buffer_index + 2*s->in_buffer_count)) < 0)
 575                     return ret;
 576                 av_assert0(a->planar);
 577                 for(i=0; i<a->ch_count; i++){
 578                     for(j=0; j<s->in_buffer_count; j++){
 579                         memcpy(a->ch[i] + (s->in_buffer_index+s->in_buffer_count+j  )*a->bps,
 580                             a->ch[i] + (s->in_buffer_index+s->in_buffer_count-j-1)*a->bps, a->bps);
 581                     }
 582                 }
 583                 s->in_buffer_count += (s->in_buffer_count+1)/2;
 584                 s->resample_in_constraint = 0;
 585                 s->flushed = 1;
 586             }
 587         }else{
 588             return 0;
 589         }
 590     }else
 591         fill_audiodata(in ,  (void*)in_arg);
 592
 593     fill_audiodata(out, out_arg);
 594
 595     if(s->resample){
 596         return swr_convert_internal(s, out, out_count, in, in_count);
 597     }else{
 598         AudioData tmp= *in;
 599         int ret2=0;
 600         int ret, size;
 601         size = FFMIN(out_count, s->in_buffer_count);
 602         if(size){
 603             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 604             ret= swr_convert_internal(s, out, size, &tmp, size);
 605             if(ret<0)
 606                 return ret;
 607             ret2= ret;
 608             s->in_buffer_count -= ret;
 609             s->in_buffer_index += ret;
 610             buf_set(out, out, ret);
 611             out_count -= ret;
 612             if(!s->in_buffer_count)
 613                 s->in_buffer_index = 0;
 614         }
 615
 616         if(in_count){
 617             size= s->in_buffer_index + s->in_buffer_count + in_count - out_count;
 618
 619             if(in_count > out_count) { //FIXME move after swr_convert_internal
 620                 if(   size > s->in_buffer.count
 621                 && s->in_buffer_count + in_count - out_count <= s->in_buffer_index){
 622                     buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 623                     copy(&s->in_buffer, &tmp, s->in_buffer_count);
 624                     s->in_buffer_index=0;
 625                 }else
 626                     if((ret=realloc_audio(&s->in_buffer, size)) < 0)
 627                         return ret;
 628             }
 629
 630             if(out_count){
 631                 size = FFMIN(in_count, out_count);
 632                 ret= swr_convert_internal(s, out, size, in, size);
 633                 if(ret<0)
 634                     return ret;
 635                 buf_set(in, in, ret);
 636                 in_count -= ret;
 637                 ret2 += ret;
 638             }
 639             if(in_count){
 640                 buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 641                 copy(&tmp, in, in_count);
 642                 s->in_buffer_count += in_count;
 643             }
 644         }
 645         return ret2;
 646     }
 647 }
 648