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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
  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 {"lfe_mix_level"        , "LFE Mix Level"               , OFFSET(lfe_mix_level  ), AV_OPT_TYPE_FLOAT, {.dbl=0                     }, -32    , 32        , PARAM},
  66 {"rmvol"                , "Rematrix Volume"             , OFFSET(rematrix_volume), AV_OPT_TYPE_FLOAT, {.dbl=1.0                   }, -1000  , 1000      , PARAM},
  67 {"rematrix_volume"      , "Rematrix Volume"             , OFFSET(rematrix_volume), AV_OPT_TYPE_FLOAT, {.dbl=1.0                   }, -1000  , 1000      , PARAM},
  68 {"flags"                , NULL                          , OFFSET(flags          ), AV_OPT_TYPE_FLAGS, {.dbl=0                     }, 0      , UINT_MAX  , PARAM, "flags"},
  69 {"swr_flags"            , NULL                          , OFFSET(flags          ), AV_OPT_TYPE_FLAGS, {.dbl=0                     }, 0      , UINT_MAX  , PARAM, "flags"},
  70 {"res"                  , "Force Resampling"            , 0                      , AV_OPT_TYPE_CONST, {.dbl=SWR_FLAG_RESAMPLE     }, INT_MIN, INT_MAX   , PARAM, "flags"},
  71 {"dither_scale"         , "Dither Scale"                , OFFSET(dither_scale   ), AV_OPT_TYPE_FLOAT, {.dbl=1                     }, 0      , INT_MAX   , PARAM},
  72 {"dither_method"        , "Dither Method"               , OFFSET(dither_method  ), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , SWR_DITHER_NB-1, PARAM, "dither_method"},
  73 {"rectangular"          , "Rectangular Dither"          , 0                      , AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_RECTANGULAR}, INT_MIN, INT_MAX   , PARAM, "dither_method"},
  74 {"triangular"           ,  "Triangular Dither"          , 0                      , AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_TRIANGULAR }, INT_MIN, INT_MAX   , PARAM, "dither_method"},
  75 {"triangular_hp"        , "Triangular Dither With High Pass" , 0                 , AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_TRIANGULAR_HIGHPASS }, INT_MIN, INT_MAX, PARAM, "dither_method"},
  76 {"filter_size"          , "Resampling Filter Size"      , OFFSET(filter_size)    , AV_OPT_TYPE_INT  , {.dbl=16                    }, 0      , INT_MAX   , PARAM },
  77 {"phase_shift"          , "Resampling Phase Shift"      , OFFSET(phase_shift)    , AV_OPT_TYPE_INT  , {.dbl=10                    }, 0      , 30        , PARAM },
  78 {"linear_interp"        , "Use Linear Interpolation"    , OFFSET(linear_interp)  , AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , 1         , PARAM },
  79 {"cutoff"               , "Cutoff Frequency Ratio"      , OFFSET(cutoff)         , AV_OPT_TYPE_DOUBLE,{.dbl=0.8                   }, 0      , 1         , PARAM },
  80 {0}
  81 };
  82
  83 static const char* context_to_name(void* ptr) {
  84     return "SWR";
  85 }
  86
  87 static const AVClass av_class = {
  88     .class_name                = "SwrContext",
  89     .item_name                 = context_to_name,
  90     .option                    = options,
  91     .version                   = LIBAVUTIL_VERSION_INT,
  92     .log_level_offset_offset   = OFFSET(log_level_offset),
  93     .parent_log_context_offset = OFFSET(log_ctx),
  94 };
  95
  96 unsigned swresample_version(void)
  97 {
  98     av_assert0(LIBSWRESAMPLE_VERSION_MICRO >= 100);
  99     return LIBSWRESAMPLE_VERSION_INT;
 100 }
 101
 102 const char *swresample_configuration(void)
 103 {
 104     return FFMPEG_CONFIGURATION;
 105 }
 106
 107 const char *swresample_license(void)
 108 {
 109 #define LICENSE_PREFIX "libswresample license: "
 110     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
 111 }
 112
 113 int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map){
 114     if(!s || s->in_convert) // s needs to be allocated but not initialized
 115         return AVERROR(EINVAL);
 116     s->channel_map = channel_map;
 117     return 0;
 118 }
 119
 120 const AVClass *swr_get_class(void)
 121 {
 122     return &av_class;
 123 }
 124
 125 struct SwrContext *swr_alloc(void){
 126     SwrContext *s= av_mallocz(sizeof(SwrContext));
 127     if(s){
 128         s->av_class= &av_class;
 129         av_opt_set_defaults(s);
 130     }
 131     return s;
 132 }
 133
 134 struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
 135                                       int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
 136                                       int64_t  in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
 137                                       int log_offset, void *log_ctx){
 138     if(!s) s= swr_alloc();
 139     if(!s) return NULL;
 140
 141     s->log_level_offset= log_offset;
 142     s->log_ctx= log_ctx;
 143
 144     av_opt_set_int(s, "ocl", out_ch_layout,   0);
 145     av_opt_set_int(s, "osf", out_sample_fmt,  0);
 146     av_opt_set_int(s, "osr", out_sample_rate, 0);
 147     av_opt_set_int(s, "icl", in_ch_layout,    0);
 148     av_opt_set_int(s, "isf", in_sample_fmt,   0);
 149     av_opt_set_int(s, "isr", in_sample_rate,  0);
 150     av_opt_set_int(s, "tsf", AV_SAMPLE_FMT_NONE,   0);
 151     av_opt_set_int(s, "ich", av_get_channel_layout_nb_channels(s-> in_ch_layout), 0);
 152     av_opt_set_int(s, "och", av_get_channel_layout_nb_channels(s->out_ch_layout), 0);
 153     av_opt_set_int(s, "uch", 0, 0);
 154     return s;
 155 }
 156
 157 static void set_audiodata_fmt(AudioData *a, enum AVSampleFormat fmt){
 158     a->fmt   = fmt;
 159     a->bps   = av_get_bytes_per_sample(fmt);
 160     a->planar= av_sample_fmt_is_planar(fmt);
 161 }
 162
 163 static void free_temp(AudioData *a){
 164     av_free(a->data);
 165     memset(a, 0, sizeof(*a));
 166 }
 167
 168 void swr_free(SwrContext **ss){
 169     SwrContext *s= *ss;
 170     if(s){
 171         free_temp(&s->postin);
 172         free_temp(&s->midbuf);
 173         free_temp(&s->preout);
 174         free_temp(&s->in_buffer);
 175         free_temp(&s->dither);
 176         swri_audio_convert_free(&s-> in_convert);
 177         swri_audio_convert_free(&s->out_convert);
 178         swri_audio_convert_free(&s->full_convert);
 179         swri_resample_free(&s->resample);
 180         swri_rematrix_free(s);
 181     }
 182
 183     av_freep(ss);
 184 }
 185
 186 int swr_init(struct SwrContext *s){
 187     s->in_buffer_index= 0;
 188     s->in_buffer_count= 0;
 189     s->resample_in_constraint= 0;
 190     free_temp(&s->postin);
 191     free_temp(&s->midbuf);
 192     free_temp(&s->preout);
 193     free_temp(&s->in_buffer);
 194     free_temp(&s->dither);
 195     swri_audio_convert_free(&s-> in_convert);
 196     swri_audio_convert_free(&s->out_convert);
 197     swri_audio_convert_free(&s->full_convert);
 198     swri_rematrix_free(s);
 199
 200     s->flushed = 0;
 201
 202     if(s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
 203         av_log(s, AV_LOG_ERROR, "Requested input sample format %d is invalid\n", s->in_sample_fmt);
 204         return AVERROR(EINVAL);
 205     }
 206     if(s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
 207         av_log(s, AV_LOG_ERROR, "Requested output sample format %d is invalid\n", s->out_sample_fmt);
 208         return AVERROR(EINVAL);
 209     }
 210
 211     if(s->int_sample_fmt == AV_SAMPLE_FMT_NONE){
 212         if(av_get_planar_sample_fmt(s->in_sample_fmt) <= AV_SAMPLE_FMT_S16P){
 213             s->int_sample_fmt= AV_SAMPLE_FMT_S16P;
 214         }else if(av_get_planar_sample_fmt(s->in_sample_fmt) <= AV_SAMPLE_FMT_FLTP){
 215             s->int_sample_fmt= AV_SAMPLE_FMT_FLTP;
 216         }else{
 217             av_log(s, AV_LOG_DEBUG, "Using double precission mode\n");
 218             s->int_sample_fmt= AV_SAMPLE_FMT_DBLP;
 219         }
 220     }
 221
 222     if(   s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 223         &&s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 224         &&s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
 225         &&s->int_sample_fmt != AV_SAMPLE_FMT_DBLP){
 226         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));
 227         return AVERROR(EINVAL);
 228     }
 229
 230     set_audiodata_fmt(&s-> in, s-> in_sample_fmt);
 231     set_audiodata_fmt(&s->out, s->out_sample_fmt);
 232
 233     if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
 234         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);
 235     }else
 236         swri_resample_free(&s->resample);
 237     if(    s->int_sample_fmt != AV_SAMPLE_FMT_S16P
 238         && s->int_sample_fmt != AV_SAMPLE_FMT_S32P
 239         && s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
 240         && s->int_sample_fmt != AV_SAMPLE_FMT_DBLP
 241         && s->resample){
 242         av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16/s32/flt/dbl\n");
 243         return -1;
 244     }
 245
 246     if(!s->used_ch_count)
 247         s->used_ch_count= s->in.ch_count;
 248
 249     if(s->used_ch_count && s-> in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s-> in_ch_layout)){
 250         av_log(s, AV_LOG_WARNING, "Input channel layout has a different number of channels than the number of used channels, ignoring layout\n");
 251         s-> in_ch_layout= 0;
 252     }
 253
 254     if(!s-> in_ch_layout)
 255         s-> in_ch_layout= av_get_default_channel_layout(s->used_ch_count);
 256     if(!s->out_ch_layout)
 257         s->out_ch_layout= av_get_default_channel_layout(s->out.ch_count);
 258
 259     s->rematrix= s->out_ch_layout  !=s->in_ch_layout || s->rematrix_volume!=1.0 ||
 260                  s->rematrix_custom;
 261
 262 #define RSC 1 //FIXME finetune
 263     if(!s-> in.ch_count)
 264         s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
 265     if(!s->used_ch_count)
 266         s->used_ch_count= s->in.ch_count;
 267     if(!s->out.ch_count)
 268         s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
 269
 270     if(!s-> in.ch_count){
 271         av_assert0(!s->in_ch_layout);
 272         av_log(s, AV_LOG_ERROR, "Input channel count and layout are unset\n");
 273         return -1;
 274     }
 275
 276     if ((!s->out_ch_layout || !s->in_ch_layout) && s->used_ch_count != s->out.ch_count && !s->rematrix_custom) {
 277         av_log(s, AV_LOG_ERROR, "Rematrix is needed but there is not enough information to do it\n");
 278         return -1;
 279     }
 280
 281 av_assert0(s->used_ch_count);
 282 av_assert0(s->out.ch_count);
 283     s->resample_first= RSC*s->out.ch_count/s->in.ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;
 284
 285     s->in_buffer= s->in;
 286
 287     if(!s->resample && !s->rematrix && !s->channel_map && !s->dither_method){
 288         s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt,
 289                                                    s-> in_sample_fmt, s-> in.ch_count, NULL, 0);
 290         return 0;
 291     }
 292
 293     s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt,
 294                                              s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0);
 295     s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt,
 296                                              s->int_sample_fmt, s->out.ch_count, NULL, 0);
 297
 298
 299     s->postin= s->in;
 300     s->preout= s->out;
 301     s->midbuf= s->in;
 302
 303     if(s->channel_map){
 304         s->postin.ch_count=
 305         s->midbuf.ch_count= s->used_ch_count;
 306         if(s->resample)
 307             s->in_buffer.ch_count= s->used_ch_count;
 308     }
 309     if(!s->resample_first){
 310         s->midbuf.ch_count= s->out.ch_count;
 311         if(s->resample)
 312             s->in_buffer.ch_count = s->out.ch_count;
 313     }
 314
 315     set_audiodata_fmt(&s->postin, s->int_sample_fmt);
 316     set_audiodata_fmt(&s->midbuf, s->int_sample_fmt);
 317     set_audiodata_fmt(&s->preout, s->int_sample_fmt);
 318
 319     if(s->resample){
 320         set_audiodata_fmt(&s->in_buffer, s->int_sample_fmt);
 321     }
 322
 323     s->dither = s->preout;
 324
 325     if(s->rematrix || s->dither_method)
 326         return swri_rematrix_init(s);
 327
 328     return 0;
 329 }
 330
 331 static int realloc_audio(AudioData *a, int count){
 332     int i, countb;
 333     AudioData old;
 334
 335     if(a->count >= count)
 336         return 0;
 337
 338     count*=2;
 339
 340     countb= FFALIGN(count*a->bps, 32);
 341     old= *a;
 342
 343     av_assert0(a->bps);
 344     av_assert0(a->ch_count);
 345
 346     a->data= av_malloc(countb*a->ch_count);
 347     if(!a->data)
 348         return AVERROR(ENOMEM);
 349     for(i=0; i<a->ch_count; i++){
 350         a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
 351         if(a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
 352     }
 353     if(!a->planar) memcpy(a->ch[0], old.ch[0], a->count*a->ch_count*a->bps);
 354     av_free(old.data);
 355     a->count= count;
 356
 357     return 1;
 358 }
 359
 360 static void copy(AudioData *out, AudioData *in,
 361                  int count){
 362     av_assert0(out->planar == in->planar);
 363     av_assert0(out->bps == in->bps);
 364     av_assert0(out->ch_count == in->ch_count);
 365     if(out->planar){
 366         int ch;
 367         for(ch=0; ch<out->ch_count; ch++)
 368             memcpy(out->ch[ch], in->ch[ch], count*out->bps);
 369     }else
 370         memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
 371 }
 372
 373 static void fill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 374     int i;
 375     if(out->planar){
 376         for(i=0; i<out->ch_count; i++)
 377             out->ch[i]= in_arg[i];
 378     }else{
 379         for(i=0; i<out->ch_count; i++)
 380             out->ch[i]= in_arg[0] + i*out->bps;
 381     }
 382 }
 383
 384 /**
 385  *
 386  * out may be equal in.
 387  */
 388 static void buf_set(AudioData *out, AudioData *in, int count){
 389     int ch;
 390     if(in->planar){
 391         for(ch=0; ch<out->ch_count; ch++)
 392             out->ch[ch]= in->ch[ch] + count*out->bps;
 393     }else{
 394         for(ch=0; ch<out->ch_count; ch++)
 395             out->ch[ch]= in->ch[0] + (ch + count*out->ch_count) * out->bps;
 396     }
 397 }
 398
 399 /**
 400  *
 401  * @return number of samples output per channel
 402  */
 403 static int resample(SwrContext *s, AudioData *out_param, int out_count,
 404                              const AudioData * in_param, int in_count){
 405     AudioData in, out, tmp;
 406     int ret_sum=0;
 407     int border=0;
 408
 409     tmp=out=*out_param;
 410     in =  *in_param;
 411
 412     do{
 413         int ret, size, consumed;
 414         if(!s->resample_in_constraint && s->in_buffer_count){
 415             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 416             ret= swri_multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
 417             out_count -= ret;
 418             ret_sum += ret;
 419             buf_set(&out, &out, ret);
 420             s->in_buffer_count -= consumed;
 421             s->in_buffer_index += consumed;
 422
 423             if(!in_count)
 424                 break;
 425             if(s->in_buffer_count <= border){
 426                 buf_set(&in, &in, -s->in_buffer_count);
 427                 in_count += s->in_buffer_count;
 428                 s->in_buffer_count=0;
 429                 s->in_buffer_index=0;
 430                 border = 0;
 431             }
 432         }
 433
 434         if(in_count && !s->in_buffer_count){
 435             s->in_buffer_index=0;
 436             ret= swri_multiple_resample(s->resample, &out, out_count, &in, in_count, &consumed);
 437             out_count -= ret;
 438             ret_sum += ret;
 439             buf_set(&out, &out, ret);
 440             in_count -= consumed;
 441             buf_set(&in, &in, consumed);
 442         }
 443
 444         //TODO is this check sane considering the advanced copy avoidance below
 445         size= s->in_buffer_index + s->in_buffer_count + in_count;
 446         if(   size > s->in_buffer.count
 447            && s->in_buffer_count + in_count <= s->in_buffer_index){
 448             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 449             copy(&s->in_buffer, &tmp, s->in_buffer_count);
 450             s->in_buffer_index=0;
 451         }else
 452             if((ret=realloc_audio(&s->in_buffer, size)) < 0)
 453                 return ret;
 454
 455         if(in_count){
 456             int count= in_count;
 457             if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;
 458
 459             buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 460             copy(&tmp, &in, /*in_*/count);
 461             s->in_buffer_count += count;
 462             in_count -= count;
 463             border += count;
 464             buf_set(&in, &in, count);
 465             s->resample_in_constraint= 0;
 466             if(s->in_buffer_count != count || in_count)
 467                 continue;
 468         }
 469         break;
 470     }while(1);
 471
 472     s->resample_in_constraint= !!out_count;
 473
 474     return ret_sum;
 475 }
 476
 477 static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_count,
 478                                                       AudioData *in , int  in_count){
 479     AudioData *postin, *midbuf, *preout;
 480     int ret/*, in_max*/;
 481     AudioData preout_tmp, midbuf_tmp;
 482
 483     if(s->full_convert){
 484         av_assert0(!s->resample);
 485         swri_audio_convert(s->full_convert, out, in, in_count);
 486         return out_count;
 487     }
 488
 489 //     in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
 490 //     in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);
 491
 492     if((ret=realloc_audio(&s->postin, in_count))<0)
 493         return ret;
 494     if(s->resample_first){
 495         av_assert0(s->midbuf.ch_count == s->used_ch_count);
 496         if((ret=realloc_audio(&s->midbuf, out_count))<0)
 497             return ret;
 498     }else{
 499         av_assert0(s->midbuf.ch_count ==  s->out.ch_count);
 500         if((ret=realloc_audio(&s->midbuf,  in_count))<0)
 501             return ret;
 502     }
 503     if((ret=realloc_audio(&s->preout, out_count))<0)
 504         return ret;
 505
 506     postin= &s->postin;
 507
 508     midbuf_tmp= s->midbuf;
 509     midbuf= &midbuf_tmp;
 510     preout_tmp= s->preout;
 511     preout= &preout_tmp;
 512
 513     if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar)
 514         postin= in;
 515
 516     if(s->resample_first ? !s->resample : !s->rematrix)
 517         midbuf= postin;
 518
 519     if(s->resample_first ? !s->rematrix : !s->resample)
 520         preout= midbuf;
 521
 522     if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar){
 523         if(preout==in){
 524             out_count= FFMIN(out_count, in_count); //TODO check at the end if this is needed or redundant
 525             av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
 526             copy(out, in, out_count);
 527             return out_count;
 528         }
 529         else if(preout==postin) preout= midbuf= postin= out;
 530         else if(preout==midbuf) preout= midbuf= out;
 531         else                    preout= out;
 532     }
 533
 534     if(in != postin){
 535         swri_audio_convert(s->in_convert, postin, in, in_count);
 536     }
 537
 538     if(s->resample_first){
 539         if(postin != midbuf)
 540             out_count= resample(s, midbuf, out_count, postin, in_count);
 541         if(midbuf != preout)
 542             swri_rematrix(s, preout, midbuf, out_count, preout==out);
 543     }else{
 544         if(postin != midbuf)
 545             swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
 546         if(midbuf != preout)
 547             out_count= resample(s, preout, out_count, midbuf, in_count);
 548     }
 549
 550     if(preout != out && out_count){
 551         if(s->dither_method){
 552             int ch;
 553             int dither_count= FFMAX(out_count, 1<<16);
 554             av_assert0(preout != in);
 555
 556             if((ret=realloc_audio(&s->dither, dither_count))<0)
 557                 return ret;
 558             if(ret)
 559                 for(ch=0; ch<s->dither.ch_count; ch++)
 560                     swri_get_dither(s, s->dither.ch[ch], s->dither.count, 12345678913579<<ch, s->out_sample_fmt, s->int_sample_fmt);
 561             av_assert0(s->dither.ch_count == preout->ch_count);
 562
 563             if(s->dither_pos + out_count > s->dither.count)
 564                 s->dither_pos = 0;
 565
 566             for(ch=0; ch<preout->ch_count; ch++)
 567                 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);
 568
 569             s->dither_pos += out_count;
 570         }
 571 //FIXME packed doesnt need more than 1 chan here!
 572         swri_audio_convert(s->out_convert, out, preout, out_count);
 573     }
 574     return out_count;
 575 }
 576
 577 int swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
 578                                 const uint8_t *in_arg [SWR_CH_MAX], int  in_count){
 579     AudioData * in= &s->in;
 580     AudioData *out= &s->out;
 581
 582     if(!in_arg){
 583         if(s->in_buffer_count){
 584             if (s->resample && !s->flushed) {
 585                 AudioData *a= &s->in_buffer;
 586                 int i, j, ret;
 587                 if((ret=realloc_audio(a, s->in_buffer_index + 2*s->in_buffer_count)) < 0)
 588                     return ret;
 589                 av_assert0(a->planar);
 590                 for(i=0; i<a->ch_count; i++){
 591                     for(j=0; j<s->in_buffer_count; j++){
 592                         memcpy(a->ch[i] + (s->in_buffer_index+s->in_buffer_count+j  )*a->bps,
 593                             a->ch[i] + (s->in_buffer_index+s->in_buffer_count-j-1)*a->bps, a->bps);
 594                     }
 595                 }
 596                 s->in_buffer_count += (s->in_buffer_count+1)/2;
 597                 s->resample_in_constraint = 0;
 598                 s->flushed = 1;
 599             }
 600         }else{
 601             return 0;
 602         }
 603     }else
 604         fill_audiodata(in ,  (void*)in_arg);
 605
 606     fill_audiodata(out, out_arg);
 607
 608     if(s->resample){
 609         return swr_convert_internal(s, out, out_count, in, in_count);
 610     }else{
 611         AudioData tmp= *in;
 612         int ret2=0;
 613         int ret, size;
 614         size = FFMIN(out_count, s->in_buffer_count);
 615         if(size){
 616             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 617             ret= swr_convert_internal(s, out, size, &tmp, size);
 618             if(ret<0)
 619                 return ret;
 620             ret2= ret;
 621             s->in_buffer_count -= ret;
 622             s->in_buffer_index += ret;
 623             buf_set(out, out, ret);
 624             out_count -= ret;
 625             if(!s->in_buffer_count)
 626                 s->in_buffer_index = 0;
 627         }
 628
 629         if(in_count){
 630             size= s->in_buffer_index + s->in_buffer_count + in_count - out_count;
 631
 632             if(in_count > out_count) { //FIXME move after swr_convert_internal
 633                 if(   size > s->in_buffer.count
 634                 && s->in_buffer_count + in_count - out_count <= s->in_buffer_index){
 635                     buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 636                     copy(&s->in_buffer, &tmp, s->in_buffer_count);
 637                     s->in_buffer_index=0;
 638                 }else
 639                     if((ret=realloc_audio(&s->in_buffer, size)) < 0)
 640                         return ret;
 641             }
 642
 643             if(out_count){
 644                 size = FFMIN(in_count, out_count);
 645                 ret= swr_convert_internal(s, out, size, in, size);
 646                 if(ret<0)
 647                     return ret;
 648                 buf_set(in, in, ret);
 649                 in_count -= ret;
 650                 ret2 += ret;
 651             }
 652             if(in_count){
 653                 buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 654                 copy(&tmp, in, in_count);
 655                 s->in_buffer_count += in_count;
 656             }
 657         }
 658         return ret2;
 659     }
 660 }
 661