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   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 #define ALIGN 32
  36
  37 //TODO split options array out?
  38 #define OFFSET(x) offsetof(SwrContext,x)
  39 #define PARAM AV_OPT_FLAG_AUDIO_PARAM
  40
  41 static const AVOption options[]={
  42 {"ich"                  ,  "Input Channel Count"        , OFFSET( in.ch_count   ), AV_OPT_TYPE_INT  , {.dbl=2                     }, 0      , SWR_CH_MAX, PARAM},
  43 {"in_channel_count"     ,  "Input Channel Count"        , OFFSET( in.ch_count   ), AV_OPT_TYPE_INT  , {.dbl=2                     }, 0      , SWR_CH_MAX, PARAM},
  44 {"och"                  , "Output Channel Count"        , OFFSET(out.ch_count   ), AV_OPT_TYPE_INT  , {.dbl=2                     }, 0      , SWR_CH_MAX, PARAM},
  45 {"out_channel_count"    , "Output Channel Count"        , OFFSET(out.ch_count   ), AV_OPT_TYPE_INT  , {.dbl=2                     }, 0      , SWR_CH_MAX, PARAM},
  46 {"uch"                  ,   "Used Channel Count"        , OFFSET(used_ch_count  ), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , SWR_CH_MAX, PARAM},
  47 {"used_channel_count"   ,   "Used Channel Count"        , OFFSET(used_ch_count  ), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , SWR_CH_MAX, PARAM},
  48 {"isr"                  ,  "Input Sample Rate"          , OFFSET( in_sample_rate), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , INT_MAX   , PARAM},
  49 {"in_sample_rate"       ,  "Input Sample Rate"          , OFFSET( in_sample_rate), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , INT_MAX   , PARAM},
  50 {"osr"                  , "Output Sample Rate"          , OFFSET(out_sample_rate), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , INT_MAX   , PARAM},
  51 {"out_sample_rate"      , "Output Sample Rate"          , OFFSET(out_sample_rate), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , INT_MAX   , PARAM},
  52 {"isf"                  ,    "Input Sample Format"      , OFFSET( in_sample_fmt ), AV_OPT_TYPE_INT  , {.dbl=AV_SAMPLE_FMT_NONE    }, -1     , AV_SAMPLE_FMT_NB-1+256, PARAM},
  53 {"in_sample_fmt"        ,    "Input Sample Format"      , OFFSET( in_sample_fmt ), AV_OPT_TYPE_INT  , {.dbl=AV_SAMPLE_FMT_NONE    }, -1     , AV_SAMPLE_FMT_NB-1+256, PARAM},
  54 {"osf"                  ,   "Output Sample Format"      , OFFSET(out_sample_fmt ), AV_OPT_TYPE_INT  , {.dbl=AV_SAMPLE_FMT_NONE    }, -1     , AV_SAMPLE_FMT_NB-1+256, PARAM},
  55 {"out_sample_fmt"       ,   "Output Sample Format"      , OFFSET(out_sample_fmt ), AV_OPT_TYPE_INT  , {.dbl=AV_SAMPLE_FMT_NONE    }, -1     , AV_SAMPLE_FMT_NB-1+256, PARAM},
  56 {"tsf"                  , "Internal Sample Format"      , OFFSET(int_sample_fmt ), AV_OPT_TYPE_INT  , {.dbl=AV_SAMPLE_FMT_NONE    }, -1     , AV_SAMPLE_FMT_FLTP, PARAM},
  57 {"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},
  58 {"icl"                  ,   "Input Channel Layout"      , OFFSET( in_ch_layout  ), AV_OPT_TYPE_INT64, {.dbl=0                     }, 0      , INT64_MAX , PARAM, "channel_layout"},
  59 {"in_channel_layout"    ,   "Input Channel Layout"      , OFFSET( in_ch_layout  ), AV_OPT_TYPE_INT64, {.dbl=0                     }, 0      , INT64_MAX , PARAM, "channel_layout"},
  60 {"ocl"                  ,  "Output Channel Layout"      , OFFSET(out_ch_layout  ), AV_OPT_TYPE_INT64, {.dbl=0                     }, 0      , INT64_MAX , PARAM, "channel_layout"},
  61 {"out_channel_layout"   ,  "Output Channel Layout"      , OFFSET(out_ch_layout  ), AV_OPT_TYPE_INT64, {.dbl=0                     }, 0      , INT64_MAX , PARAM, "channel_layout"},
  62 {"clev"                 ,    "Center Mix Level"         , OFFSET(clev           ), AV_OPT_TYPE_FLOAT, {.dbl=C_30DB                }, -32    , 32        , PARAM},
  63 {"center_mix_level"     ,    "Center Mix Level"         , OFFSET(clev           ), AV_OPT_TYPE_FLOAT, {.dbl=C_30DB                }, -32    , 32        , PARAM},
  64 {"slev"                 , "Sourround Mix Level"         , OFFSET(slev           ), AV_OPT_TYPE_FLOAT, {.dbl=C_30DB                }, -32    , 32        , PARAM},
  65 {"surround_mix_level"   , "Sourround Mix Level"         , OFFSET(slev           ), AV_OPT_TYPE_FLOAT, {.dbl=C_30DB                }, -32    , 32        , PARAM},
  66 {"lfe_mix_level"        , "LFE Mix Level"               , OFFSET(lfe_mix_level  ), AV_OPT_TYPE_FLOAT, {.dbl=0                     }, -32    , 32        , PARAM},
  67 {"rmvol"                , "Rematrix Volume"             , OFFSET(rematrix_volume), AV_OPT_TYPE_FLOAT, {.dbl=1.0                   }, -1000  , 1000      , PARAM},
  68 {"rematrix_volume"      , "Rematrix Volume"             , OFFSET(rematrix_volume), AV_OPT_TYPE_FLOAT, {.dbl=1.0                   }, -1000  , 1000      , PARAM},
  69 {"flags"                , NULL                          , OFFSET(flags          ), AV_OPT_TYPE_FLAGS, {.dbl=0                     }, 0      , UINT_MAX  , PARAM, "flags"},
  70 {"swr_flags"            , NULL                          , OFFSET(flags          ), AV_OPT_TYPE_FLAGS, {.dbl=0                     }, 0      , UINT_MAX  , PARAM, "flags"},
  71 {"res"                  , "Force Resampling"            , 0                      , AV_OPT_TYPE_CONST, {.dbl=SWR_FLAG_RESAMPLE     }, INT_MIN, INT_MAX   , PARAM, "flags"},
  72 {"dither_scale"         , "Dither Scale"                , OFFSET(dither_scale   ), AV_OPT_TYPE_FLOAT, {.dbl=1                     }, 0      , INT_MAX   , PARAM},
  73 {"dither_method"        , "Dither Method"               , OFFSET(dither_method  ), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , SWR_DITHER_NB-1, PARAM, "dither_method"},
  74 {"rectangular"          , "Rectangular Dither"          , 0                      , AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_RECTANGULAR}, INT_MIN, INT_MAX   , PARAM, "dither_method"},
  75 {"triangular"           ,  "Triangular Dither"          , 0                      , AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_TRIANGULAR }, INT_MIN, INT_MAX   , PARAM, "dither_method"},
  76 {"triangular_hp"        , "Triangular Dither With High Pass" , 0                 , AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_TRIANGULAR_HIGHPASS }, INT_MIN, INT_MAX, PARAM, "dither_method"},
  77 {"filter_size"          , "Resampling Filter Size"      , OFFSET(filter_size)    , AV_OPT_TYPE_INT  , {.dbl=16                    }, 0      , INT_MAX   , PARAM },
  78 {"phase_shift"          , "Resampling Phase Shift"      , OFFSET(phase_shift)    , AV_OPT_TYPE_INT  , {.dbl=10                    }, 0      , 30        , PARAM },
  79 {"linear_interp"        , "Use Linear Interpolation"    , OFFSET(linear_interp)  , AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , 1         , PARAM },
  80 {"cutoff"               , "Cutoff Frequency Ratio"      , OFFSET(cutoff)         , AV_OPT_TYPE_DOUBLE,{.dbl=0.8                   }, 0      , 1         , PARAM },
  81 {0}
  82 };
  83
  84 static const char* context_to_name(void* ptr) {
  85     return "SWR";
  86 }
  87
  88 static const AVClass av_class = {
  89     .class_name                = "SwrContext",
  90     .item_name                 = context_to_name,
  91     .option                    = options,
  92     .version                   = LIBAVUTIL_VERSION_INT,
  93     .log_level_offset_offset   = OFFSET(log_level_offset),
  94     .parent_log_context_offset = OFFSET(log_ctx),
  95 };
  96
  97 unsigned swresample_version(void)
  98 {
  99     av_assert0(LIBSWRESAMPLE_VERSION_MICRO >= 100);
 100     return LIBSWRESAMPLE_VERSION_INT;
 101 }
 102
 103 const char *swresample_configuration(void)
 104 {
 105     return FFMPEG_CONFIGURATION;
 106 }
 107
 108 const char *swresample_license(void)
 109 {
 110 #define LICENSE_PREFIX "libswresample license: "
 111     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
 112 }
 113
 114 int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map){
 115     if(!s || s->in_convert) // s needs to be allocated but not initialized
 116         return AVERROR(EINVAL);
 117     s->channel_map = channel_map;
 118     return 0;
 119 }
 120
 121 const AVClass *swr_get_class(void)
 122 {
 123     return &av_class;
 124 }
 125
 126 struct SwrContext *swr_alloc(void){
 127     SwrContext *s= av_mallocz(sizeof(SwrContext));
 128     if(s){
 129         s->av_class= &av_class;
 130         av_opt_set_defaults(s);
 131     }
 132     return s;
 133 }
 134
 135 struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
 136                                       int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
 137                                       int64_t  in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
 138                                       int log_offset, void *log_ctx){
 139     if(!s) s= swr_alloc();
 140     if(!s) return NULL;
 141
 142     s->log_level_offset= log_offset;
 143     s->log_ctx= log_ctx;
 144
 145     av_opt_set_int(s, "ocl", out_ch_layout,   0);
 146     av_opt_set_int(s, "osf", out_sample_fmt,  0);
 147     av_opt_set_int(s, "osr", out_sample_rate, 0);
 148     av_opt_set_int(s, "icl", in_ch_layout,    0);
 149     av_opt_set_int(s, "isf", in_sample_fmt,   0);
 150     av_opt_set_int(s, "isr", in_sample_rate,  0);
 151     av_opt_set_int(s, "tsf", AV_SAMPLE_FMT_NONE,   0);
 152     av_opt_set_int(s, "ich", av_get_channel_layout_nb_channels(s-> in_ch_layout), 0);
 153     av_opt_set_int(s, "och", av_get_channel_layout_nb_channels(s->out_ch_layout), 0);
 154     av_opt_set_int(s, "uch", 0, 0);
 155     return s;
 156 }
 157
 158 static void set_audiodata_fmt(AudioData *a, enum AVSampleFormat fmt){
 159     a->fmt   = fmt;
 160     a->bps   = av_get_bytes_per_sample(fmt);
 161     a->planar= av_sample_fmt_is_planar(fmt);
 162 }
 163
 164 static void free_temp(AudioData *a){
 165     av_free(a->data);
 166     memset(a, 0, sizeof(*a));
 167 }
 168
 169 void swr_free(SwrContext **ss){
 170     SwrContext *s= *ss;
 171     if(s){
 172         free_temp(&s->postin);
 173         free_temp(&s->midbuf);
 174         free_temp(&s->preout);
 175         free_temp(&s->in_buffer);
 176         free_temp(&s->dither);
 177         swri_audio_convert_free(&s-> in_convert);
 178         swri_audio_convert_free(&s->out_convert);
 179         swri_audio_convert_free(&s->full_convert);
 180         swri_resample_free(&s->resample);
 181         swri_rematrix_free(s);
 182     }
 183
 184     av_freep(ss);
 185 }
 186
 187 int swr_init(struct SwrContext *s){
 188     s->in_buffer_index= 0;
 189     s->in_buffer_count= 0;
 190     s->resample_in_constraint= 0;
 191     free_temp(&s->postin);
 192     free_temp(&s->midbuf);
 193     free_temp(&s->preout);
 194     free_temp(&s->in_buffer);
 195     free_temp(&s->dither);
 196     swri_audio_convert_free(&s-> in_convert);
 197     swri_audio_convert_free(&s->out_convert);
 198     swri_audio_convert_free(&s->full_convert);
 199     swri_rematrix_free(s);
 200
 201     s->flushed = 0;
 202
 203     if(s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
 204         av_log(s, AV_LOG_ERROR, "Requested input sample format %d is invalid\n", s->in_sample_fmt);
 205         return AVERROR(EINVAL);
 206     }
 207     if(s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
 208         av_log(s, AV_LOG_ERROR, "Requested output sample format %d is invalid\n", s->out_sample_fmt);
 209         return AVERROR(EINVAL);
 210     }
 211
 212     if(s->int_sample_fmt == AV_SAMPLE_FMT_NONE){
 213         if(av_get_planar_sample_fmt(s->in_sample_fmt) <= AV_SAMPLE_FMT_S16P){
 214             s->int_sample_fmt= AV_SAMPLE_FMT_S16P;
 215         }else if(av_get_planar_sample_fmt(s->in_sample_fmt) <= AV_SAMPLE_FMT_FLTP){
 216             s->int_sample_fmt= AV_SAMPLE_FMT_FLTP;
 217         }else{
 218             av_log(s, AV_LOG_DEBUG, "Using double precission mode\n");
 219             s->int_sample_fmt= AV_SAMPLE_FMT_DBLP;
 220         }
 221     }
 222
 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->int_sample_fmt != AV_SAMPLE_FMT_DBLP){
 227         av_log(s, AV_LOG_ERROR, "Requested sample format %s is not supported internally, S16/S32/FLT/DBL is supported\n", av_get_sample_fmt_name(s->int_sample_fmt));
 228         return AVERROR(EINVAL);
 229     }
 230
 231     set_audiodata_fmt(&s-> in, s-> in_sample_fmt);
 232     set_audiodata_fmt(&s->out, s->out_sample_fmt);
 233
 234     if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
 235         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);
 236     }else
 237         swri_resample_free(&s->resample);
 238     if(    s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 239         && s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 240         && s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
 241         && s->int_sample_fmt != AV_SAMPLE_FMT_DBLP
 242         && s->resample){
 243         av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16/s32/flt/dbl\n");
 244         return -1;
 245     }
 246
 247     if(!s->used_ch_count)
 248         s->used_ch_count= s->in.ch_count;
 249
 250     if(s->used_ch_count && s-> in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s-> in_ch_layout)){
 251         av_log(s, AV_LOG_WARNING, "Input channel layout has a different number of channels than the number of used channels, ignoring layout\n");
 252         s-> in_ch_layout= 0;
 253     }
 254
 255     if(!s-> in_ch_layout)
 256         s-> in_ch_layout= av_get_default_channel_layout(s->used_ch_count);
 257     if(!s->out_ch_layout)
 258         s->out_ch_layout= av_get_default_channel_layout(s->out.ch_count);
 259
 260     s->rematrix= s->out_ch_layout  !=s->in_ch_layout || s->rematrix_volume!=1.0 ||
 261                  s->rematrix_custom;
 262
 263 #define RSC 1 //FIXME finetune
 264     if(!s-> in.ch_count)
 265         s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
 266     if(!s->used_ch_count)
 267         s->used_ch_count= s->in.ch_count;
 268     if(!s->out.ch_count)
 269         s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
 270
 271     if(!s-> in.ch_count){
 272         av_assert0(!s->in_ch_layout);
 273         av_log(s, AV_LOG_ERROR, "Input channel count and layout are unset\n");
 274         return -1;
 275     }
 276
 277     if ((!s->out_ch_layout || !s->in_ch_layout) && s->used_ch_count != s->out.ch_count && !s->rematrix_custom) {
 278         av_log(s, AV_LOG_ERROR, "Rematrix is needed but there is not enough information to do it\n");
 279         return -1;
 280     }
 281
 282 av_assert0(s->used_ch_count);
 283 av_assert0(s->out.ch_count);
 284     s->resample_first= RSC*s->out.ch_count/s->in.ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;
 285
 286     s->in_buffer= s->in;
 287
 288     if(!s->resample && !s->rematrix && !s->channel_map && !s->dither_method){
 289         s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt,
 290                                                    s-> in_sample_fmt, s-> in.ch_count, NULL, 0);
 291         return 0;
 292     }
 293
 294     s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt,
 295                                              s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0);
 296     s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt,
 297                                              s->int_sample_fmt, s->out.ch_count, NULL, 0);
 298
 299
 300     s->postin= s->in;
 301     s->preout= s->out;
 302     s->midbuf= s->in;
 303
 304     if(s->channel_map){
 305         s->postin.ch_count=
 306         s->midbuf.ch_count= s->used_ch_count;
 307         if(s->resample)
 308             s->in_buffer.ch_count= s->used_ch_count;
 309     }
 310     if(!s->resample_first){
 311         s->midbuf.ch_count= s->out.ch_count;
 312         if(s->resample)
 313             s->in_buffer.ch_count = s->out.ch_count;
 314     }
 315
 316     set_audiodata_fmt(&s->postin, s->int_sample_fmt);
 317     set_audiodata_fmt(&s->midbuf, s->int_sample_fmt);
 318     set_audiodata_fmt(&s->preout, s->int_sample_fmt);
 319
 320     if(s->resample){
 321         set_audiodata_fmt(&s->in_buffer, s->int_sample_fmt);
 322     }
 323
 324     s->dither = s->preout;
 325
 326     if(s->rematrix || s->dither_method)
 327         return swri_rematrix_init(s);
 328
 329     return 0;
 330 }
 331
 332 static int realloc_audio(AudioData *a, int count){
 333     int i, countb;
 334     AudioData old;
 335
 336     if(a->count >= count)
 337         return 0;
 338
 339     count*=2;
 340
 341     countb= FFALIGN(count*a->bps, ALIGN);
 342     old= *a;
 343
 344     av_assert0(a->bps);
 345     av_assert0(a->ch_count);
 346
 347     a->data= av_malloc(countb*a->ch_count);
 348     if(!a->data)
 349         return AVERROR(ENOMEM);
 350     for(i=0; i<a->ch_count; i++){
 351         a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
 352         if(a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
 353     }
 354     if(!a->planar) memcpy(a->ch[0], old.ch[0], a->count*a->ch_count*a->bps);
 355     av_free(old.data);
 356     a->count= count;
 357
 358     return 1;
 359 }
 360
 361 static void copy(AudioData *out, AudioData *in,
 362                  int count){
 363     av_assert0(out->planar == in->planar);
 364     av_assert0(out->bps == in->bps);
 365     av_assert0(out->ch_count == in->ch_count);
 366     if(out->planar){
 367         int ch;
 368         for(ch=0; ch<out->ch_count; ch++)
 369             memcpy(out->ch[ch], in->ch[ch], count*out->bps);
 370     }else
 371         memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
 372 }
 373
 374 static void fill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 375     int i;
 376     if(!in_arg){
 377         memset(out->ch, 0, sizeof(out->ch));
 378     }else if(out->planar){
 379         for(i=0; i<out->ch_count; i++)
 380             out->ch[i]= in_arg[i];
 381     }else{
 382         for(i=0; i<out->ch_count; i++)
 383             out->ch[i]= in_arg[0] + i*out->bps;
 384     }
 385 }
 386
 387 /**
 388  *
 389  * out may be equal in.
 390  */
 391 static void buf_set(AudioData *out, AudioData *in, int count){
 392     int ch;
 393     if(in->planar){
 394         for(ch=0; ch<out->ch_count; ch++)
 395             out->ch[ch]= in->ch[ch] + count*out->bps;
 396     }else{
 397         for(ch=0; ch<out->ch_count; ch++)
 398             out->ch[ch]= in->ch[0] + (ch + count*out->ch_count) * out->bps;
 399     }
 400 }
 401
 402 /**
 403  *
 404  * @return number of samples output per channel
 405  */
 406 static int resample(SwrContext *s, AudioData *out_param, int out_count,
 407                              const AudioData * in_param, int in_count){
 408     AudioData in, out, tmp;
 409     int ret_sum=0;
 410     int border=0;
 411
 412     tmp=out=*out_param;
 413     in =  *in_param;
 414
 415     do{
 416         int ret, size, consumed;
 417         if(!s->resample_in_constraint && s->in_buffer_count){
 418             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 419             ret= swri_multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
 420             out_count -= ret;
 421             ret_sum += ret;
 422             buf_set(&out, &out, ret);
 423             s->in_buffer_count -= consumed;
 424             s->in_buffer_index += consumed;
 425
 426             if(!in_count)
 427                 break;
 428             if(s->in_buffer_count <= border){
 429                 buf_set(&in, &in, -s->in_buffer_count);
 430                 in_count += s->in_buffer_count;
 431                 s->in_buffer_count=0;
 432                 s->in_buffer_index=0;
 433                 border = 0;
 434             }
 435         }
 436
 437         if(in_count && !s->in_buffer_count){
 438             s->in_buffer_index=0;
 439             ret= swri_multiple_resample(s->resample, &out, out_count, &in, in_count, &consumed);
 440             out_count -= ret;
 441             ret_sum += ret;
 442             buf_set(&out, &out, ret);
 443             in_count -= consumed;
 444             buf_set(&in, &in, consumed);
 445         }
 446
 447         //TODO is this check sane considering the advanced copy avoidance below
 448         size= s->in_buffer_index + s->in_buffer_count + in_count;
 449         if(   size > s->in_buffer.count
 450            && s->in_buffer_count + in_count <= s->in_buffer_index){
 451             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 452             copy(&s->in_buffer, &tmp, s->in_buffer_count);
 453             s->in_buffer_index=0;
 454         }else
 455             if((ret=realloc_audio(&s->in_buffer, size)) < 0)
 456                 return ret;
 457
 458         if(in_count){
 459             int count= in_count;
 460             if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;
 461
 462             buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 463             copy(&tmp, &in, /*in_*/count);
 464             s->in_buffer_count += count;
 465             in_count -= count;
 466             border += count;
 467             buf_set(&in, &in, count);
 468             s->resample_in_constraint= 0;
 469             if(s->in_buffer_count != count || in_count)
 470                 continue;
 471         }
 472         break;
 473     }while(1);
 474
 475     s->resample_in_constraint= !!out_count;
 476
 477     return ret_sum;
 478 }
 479
 480 static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_count,
 481                                                       AudioData *in , int  in_count){
 482     AudioData *postin, *midbuf, *preout;
 483     int ret/*, in_max*/;
 484     AudioData preout_tmp, midbuf_tmp;
 485
 486     if(s->full_convert){
 487         av_assert0(!s->resample);
 488         swri_audio_convert(s->full_convert, out, in, in_count);
 489         return out_count;
 490     }
 491
 492 //     in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
 493 //     in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);
 494
 495     if((ret=realloc_audio(&s->postin, in_count))<0)
 496         return ret;
 497     if(s->resample_first){
 498         av_assert0(s->midbuf.ch_count == s->used_ch_count);
 499         if((ret=realloc_audio(&s->midbuf, out_count))<0)
 500             return ret;
 501     }else{
 502         av_assert0(s->midbuf.ch_count ==  s->out.ch_count);
 503         if((ret=realloc_audio(&s->midbuf,  in_count))<0)
 504             return ret;
 505     }
 506     if((ret=realloc_audio(&s->preout, out_count))<0)
 507         return ret;
 508
 509     postin= &s->postin;
 510
 511     midbuf_tmp= s->midbuf;
 512     midbuf= &midbuf_tmp;
 513     preout_tmp= s->preout;
 514     preout= &preout_tmp;
 515
 516     if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar)
 517         postin= in;
 518
 519     if(s->resample_first ? !s->resample : !s->rematrix)
 520         midbuf= postin;
 521
 522     if(s->resample_first ? !s->rematrix : !s->resample)
 523         preout= midbuf;
 524
 525     if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar){
 526         if(preout==in){
 527             out_count= FFMIN(out_count, in_count); //TODO check at the end if this is needed or redundant
 528             av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
 529             copy(out, in, out_count);
 530             return out_count;
 531         }
 532         else if(preout==postin) preout= midbuf= postin= out;
 533         else if(preout==midbuf) preout= midbuf= out;
 534         else                    preout= out;
 535     }
 536
 537     if(in != postin){
 538         swri_audio_convert(s->in_convert, postin, in, in_count);
 539     }
 540
 541     if(s->resample_first){
 542         if(postin != midbuf)
 543             out_count= resample(s, midbuf, out_count, postin, in_count);
 544         if(midbuf != preout)
 545             swri_rematrix(s, preout, midbuf, out_count, preout==out);
 546     }else{
 547         if(postin != midbuf)
 548             swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
 549         if(midbuf != preout)
 550             out_count= resample(s, preout, out_count, midbuf, in_count);
 551     }
 552
 553     if(preout != out && out_count){
 554         if(s->dither_method){
 555             int ch;
 556             int dither_count= FFMAX(out_count, 1<<16);
 557             av_assert0(preout != in);
 558
 559             if((ret=realloc_audio(&s->dither, dither_count))<0)
 560                 return ret;
 561             if(ret)
 562                 for(ch=0; ch<s->dither.ch_count; ch++)
 563                     swri_get_dither(s, s->dither.ch[ch], s->dither.count, 12345678913579<<ch, s->out_sample_fmt, s->int_sample_fmt);
 564             av_assert0(s->dither.ch_count == preout->ch_count);
 565
 566             if(s->dither_pos + out_count > s->dither.count)
 567                 s->dither_pos = 0;
 568
 569             for(ch=0; ch<preout->ch_count; ch++)
 570                 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);
 571
 572             s->dither_pos += out_count;
 573         }
 574 //FIXME packed doesnt need more than 1 chan here!
 575         swri_audio_convert(s->out_convert, out, preout, out_count);
 576     }
 577     return out_count;
 578 }
 579
 580 int swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
 581                                 const uint8_t *in_arg [SWR_CH_MAX], int  in_count){
 582     AudioData * in= &s->in;
 583     AudioData *out= &s->out;
 584
 585     if(!in_arg){
 586         if(s->in_buffer_count){
 587             if (s->resample && !s->flushed) {
 588                 AudioData *a= &s->in_buffer;
 589                 int i, j, ret;
 590                 if((ret=realloc_audio(a, s->in_buffer_index + 2*s->in_buffer_count)) < 0)
 591                     return ret;
 592                 av_assert0(a->planar);
 593                 for(i=0; i<a->ch_count; i++){
 594                     for(j=0; j<s->in_buffer_count; j++){
 595                         memcpy(a->ch[i] + (s->in_buffer_index+s->in_buffer_count+j  )*a->bps,
 596                             a->ch[i] + (s->in_buffer_index+s->in_buffer_count-j-1)*a->bps, a->bps);
 597                     }
 598                 }
 599                 s->in_buffer_count += (s->in_buffer_count+1)/2;
 600                 s->resample_in_constraint = 0;
 601                 s->flushed = 1;
 602             }
 603         }else{
 604             return 0;
 605         }
 606     }else
 607         fill_audiodata(in ,  (void*)in_arg);
 608
 609     fill_audiodata(out, out_arg);
 610
 611     if(s->resample){
 612         return swr_convert_internal(s, out, out_count, in, in_count);
 613     }else{
 614         AudioData tmp= *in;
 615         int ret2=0;
 616         int ret, size;
 617         size = FFMIN(out_count, s->in_buffer_count);
 618         if(size){
 619             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 620             ret= swr_convert_internal(s, out, size, &tmp, size);
 621             if(ret<0)
 622                 return ret;
 623             ret2= ret;
 624             s->in_buffer_count -= ret;
 625             s->in_buffer_index += ret;
 626             buf_set(out, out, ret);
 627             out_count -= ret;
 628             if(!s->in_buffer_count)
 629                 s->in_buffer_index = 0;
 630         }
 631
 632         if(in_count){
 633             size= s->in_buffer_index + s->in_buffer_count + in_count - out_count;
 634
 635             if(in_count > out_count) { //FIXME move after swr_convert_internal
 636                 if(   size > s->in_buffer.count
 637                 && s->in_buffer_count + in_count - out_count <= s->in_buffer_index){
 638                     buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 639                     copy(&s->in_buffer, &tmp, s->in_buffer_count);
 640                     s->in_buffer_index=0;
 641                 }else
 642                     if((ret=realloc_audio(&s->in_buffer, size)) < 0)
 643                         return ret;
 644             }
 645
 646             if(out_count){
 647                 size = FFMIN(in_count, out_count);
 648                 ret= swr_convert_internal(s, out, size, in, size);
 649                 if(ret<0)
 650                     return ret;
 651                 buf_set(in, in, ret);
 652                 in_count -= ret;
 653                 ret2 += ret;
 654             }
 655             if(in_count){
 656                 buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 657                 copy(&tmp, in, in_count);
 658                 s->in_buffer_count += in_count;
 659             }
 660         }
 661         return ret2;
 662     }
 663 }
 664