git.sesse.net Git - ffmpeg/blob - libswresample/swresample.c

   1 /*
   2  * Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
   3  *
   4  * This file is part of libswresample
   5  *
   6  * libswresample is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * libswresample is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with libswresample; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "libavutil/opt.h"
  22 #include "swresample_internal.h"
  23 #include "audioconvert.h"
  24 #include "libavutil/avassert.h"
  25 #include "libavutil/audioconvert.h"
  26
  27 #define  C30DB  M_SQRT2
  28 #define  C15DB  1.189207115
  29 #define C__0DB  1.0
  30 #define C_15DB  0.840896415
  31 #define C_30DB  M_SQRT1_2
  32 #define C_45DB  0.594603558
  33 #define C_60DB  0.5
  34
  35
  36 //TODO split options array out?
  37 #define OFFSET(x) offsetof(SwrContext,x)
  38 static const AVOption options[]={
  39 {"ich",  "input channel count", OFFSET( in.ch_count   ), AV_OPT_TYPE_INT, {.dbl=2}, 0, SWR_CH_MAX, 0},
  40 {"och", "output channel count", OFFSET(out.ch_count   ), AV_OPT_TYPE_INT, {.dbl=2}, 0, SWR_CH_MAX, 0},
  41 {"uch",   "used channel count", OFFSET(used_ch_count  ), AV_OPT_TYPE_INT, {.dbl=0}, 0, SWR_CH_MAX, 0},
  42 {"isr",  "input sample rate"  , OFFSET( in_sample_rate), AV_OPT_TYPE_INT, {.dbl=48000}, 1, INT_MAX, 0},
  43 {"osr", "output sample rate"  , OFFSET(out_sample_rate), AV_OPT_TYPE_INT, {.dbl=48000}, 1, INT_MAX, 0},
  44 //{"ip" ,  "input planar"       , OFFSET( in.planar     ), AV_OPT_TYPE_INT, {.dbl=0},    0,       1, 0},
  45 //{"op" , "output planar"       , OFFSET(out.planar     ), AV_OPT_TYPE_INT, {.dbl=0},    0,       1, 0},
  46 {"isf",  "input sample format", OFFSET( in_sample_fmt ), AV_OPT_TYPE_INT, {.dbl=AV_SAMPLE_FMT_S16}, 0, AV_SAMPLE_FMT_NB-1+256, 0},
  47 {"osf", "output sample format", OFFSET(out_sample_fmt ), AV_OPT_TYPE_INT, {.dbl=AV_SAMPLE_FMT_S16}, 0, AV_SAMPLE_FMT_NB-1+256, 0},
  48 {"tsf", "internal sample format", OFFSET(int_sample_fmt ), AV_OPT_TYPE_INT, {.dbl=AV_SAMPLE_FMT_NONE}, -1, AV_SAMPLE_FMT_FLT, 0},
  49 {"icl",  "input channel layout" , OFFSET( in_ch_layout), AV_OPT_TYPE_INT64, {.dbl=0}, 0, INT64_MAX, 0, "channel_layout"},
  50 {"ocl",  "output channel layout", OFFSET(out_ch_layout), AV_OPT_TYPE_INT64, {.dbl=0}, 0, INT64_MAX, 0, "channel_layout"},
  51 {"clev", "center mix level"     , OFFSET(clev)         , AV_OPT_TYPE_FLOAT, {.dbl=C_30DB}, 0, 4, 0},
  52 {"slev", "sourround mix level"  , OFFSET(slev)         , AV_OPT_TYPE_FLOAT, {.dbl=C_30DB}, 0, 4, 0},
  53 {"rmvol", "rematrix volume"     , OFFSET(rematrix_volume), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, -1000, 1000, 0},
  54 {"flags", NULL                  , OFFSET(flags)        , AV_OPT_TYPE_FLAGS, {.dbl=0}, 0,  UINT_MAX, 0, "flags"},
  55 {"res", "force resampling", 0, AV_OPT_TYPE_CONST, {.dbl=SWR_FLAG_RESAMPLE}, INT_MIN, INT_MAX, 0, "flags"},
  56
  57 {0}
  58 };
  59
  60 static const char* context_to_name(void* ptr) {
  61     return "SWR";
  62 }
  63
  64 static const AVClass av_class = {
  65     .class_name                = "SwrContext",
  66     .item_name                 = context_to_name,
  67     .option                    = options,
  68     .version                   = LIBAVUTIL_VERSION_INT,
  69     .log_level_offset_offset   = OFFSET(log_level_offset),
  70     .parent_log_context_offset = OFFSET(log_ctx),
  71 };
  72
  73 unsigned swresample_version(void)
  74 {
  75     av_assert0(LIBSWRESAMPLE_VERSION_MICRO >= 100);
  76     return LIBSWRESAMPLE_VERSION_INT;
  77 }
  78
  79 const char *swresample_configuration(void)
  80 {
  81     return FFMPEG_CONFIGURATION;
  82 }
  83
  84 const char *swresample_license(void)
  85 {
  86 #define LICENSE_PREFIX "libswresample license: "
  87     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
  88 }
  89
  90 int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map){
  91     if(!s || s->in_convert) // s needs to be allocated but not initialized
  92         return AVERROR(EINVAL);
  93     s->channel_map = channel_map;
  94     return 0;
  95 }
  96
  97 struct SwrContext *swr_alloc(void){
  98     SwrContext *s= av_mallocz(sizeof(SwrContext));
  99     if(s){
 100         s->av_class= &av_class;
 101         av_opt_set_defaults(s);
 102     }
 103     return s;
 104 }
 105
 106 struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
 107                                       int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
 108                                       int64_t  in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
 109                                       int log_offset, void *log_ctx){
 110     if(!s) s= swr_alloc();
 111     if(!s) return NULL;
 112
 113     s->log_level_offset= log_offset;
 114     s->log_ctx= log_ctx;
 115
 116     av_opt_set_int(s, "ocl", out_ch_layout,   0);
 117     av_opt_set_int(s, "osf", out_sample_fmt,  0);
 118     av_opt_set_int(s, "osr", out_sample_rate, 0);
 119     av_opt_set_int(s, "icl", in_ch_layout,    0);
 120     av_opt_set_int(s, "isf", in_sample_fmt,   0);
 121     av_opt_set_int(s, "isr", in_sample_rate,  0);
 122     av_opt_set_int(s, "tsf", AV_SAMPLE_FMT_S16, 0);
 123     av_opt_set_int(s, "ich", av_get_channel_layout_nb_channels(s-> in_ch_layout), 0);
 124     av_opt_set_int(s, "och", av_get_channel_layout_nb_channels(s->out_ch_layout), 0);
 125     av_opt_set_int(s, "uch", 0, 0);
 126     return s;
 127 }
 128
 129
 130 static void free_temp(AudioData *a){
 131     av_free(a->data);
 132     memset(a, 0, sizeof(*a));
 133 }
 134
 135 void swr_free(SwrContext **ss){
 136     SwrContext *s= *ss;
 137     if(s){
 138         free_temp(&s->postin);
 139         free_temp(&s->midbuf);
 140         free_temp(&s->preout);
 141         free_temp(&s->in_buffer);
 142         swri_audio_convert_free(&s-> in_convert);
 143         swri_audio_convert_free(&s->out_convert);
 144         swri_audio_convert_free(&s->full_convert);
 145         swri_resample_free(&s->resample);
 146     }
 147
 148     av_freep(ss);
 149 }
 150
 151 int swr_init(struct SwrContext *s){
 152     s->in_buffer_index= 0;
 153     s->in_buffer_count= 0;
 154     s->resample_in_constraint= 0;
 155     free_temp(&s->postin);
 156     free_temp(&s->midbuf);
 157     free_temp(&s->preout);
 158     free_temp(&s->in_buffer);
 159     swri_audio_convert_free(&s-> in_convert);
 160     swri_audio_convert_free(&s->out_convert);
 161     swri_audio_convert_free(&s->full_convert);
 162
 163     s-> in.planar= av_sample_fmt_is_planar(s-> in_sample_fmt);
 164     s->out.planar= av_sample_fmt_is_planar(s->out_sample_fmt);
 165     s-> in_sample_fmt= av_get_alt_sample_fmt(s-> in_sample_fmt, 0);
 166     s->out_sample_fmt= av_get_alt_sample_fmt(s->out_sample_fmt, 0);
 167
 168     if(s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
 169         av_log(s, AV_LOG_ERROR, "Requested input sample format %d is invalid\n", s->in_sample_fmt);
 170         return AVERROR(EINVAL);
 171     }
 172     if(s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
 173         av_log(s, AV_LOG_ERROR, "Requested output sample format %d is invalid\n", s->out_sample_fmt);
 174         return AVERROR(EINVAL);
 175     }
 176
 177     if(   s->int_sample_fmt != AV_SAMPLE_FMT_S16
 178         &&s->int_sample_fmt != AV_SAMPLE_FMT_FLT){
 179         av_log(s, AV_LOG_ERROR, "Requested sample format %s is not supported internally, only float & S16 is supported\n", av_get_sample_fmt_name(s->int_sample_fmt));
 180         return AVERROR(EINVAL);
 181     }
 182
 183     //FIXME should we allow/support using FLT on material that doesnt need it ?
 184     if(s->in_sample_fmt <= AV_SAMPLE_FMT_S16 || s->int_sample_fmt==AV_SAMPLE_FMT_S16){
 185         s->int_sample_fmt= AV_SAMPLE_FMT_S16;
 186     }else
 187         s->int_sample_fmt= AV_SAMPLE_FMT_FLT;
 188
 189
 190     if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
 191         s->resample = swri_resample_init(s->resample, s->out_sample_rate, s->in_sample_rate, 16, 10, 0, 0.8);
 192     }else
 193         swri_resample_free(&s->resample);
 194     if(s->int_sample_fmt != AV_SAMPLE_FMT_S16 && s->resample){
 195         av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16 currently\n"); //FIXME
 196         return -1;
 197     }
 198
 199     if(!s->used_ch_count)
 200         s->used_ch_count= s->in.ch_count;
 201
 202     if(s->used_ch_count && s-> in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s-> in_ch_layout)){
 203         av_log(s, AV_LOG_WARNING, "Input channel layout has a different number of channels than the number of used channels, ignoring layout\n");
 204         s-> in_ch_layout= 0;
 205     }
 206
 207     if(!s-> in_ch_layout)
 208         s-> in_ch_layout= av_get_default_channel_layout(s->used_ch_count);
 209     if(!s->out_ch_layout)
 210         s->out_ch_layout= av_get_default_channel_layout(s->out.ch_count);
 211
 212     s->rematrix= s->out_ch_layout  !=s->in_ch_layout || s->rematrix_volume!=1.0;
 213
 214 #define RSC 1 //FIXME finetune
 215     if(!s-> in.ch_count)
 216         s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
 217     if(!s->used_ch_count)
 218         s->used_ch_count= s->in.ch_count;
 219     if(!s->out.ch_count)
 220         s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
 221
 222     if(!s-> in.ch_count){
 223         av_assert0(!s->in_ch_layout);
 224         av_log(s, AV_LOG_ERROR, "Input channel count and layout are unset\n");
 225         return -1;
 226     }
 227
 228 av_assert0(s->used_ch_count);
 229 av_assert0(s->out.ch_count);
 230     s->resample_first= RSC*s->out.ch_count/s->in.ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;
 231
 232     s-> in.bps= av_get_bytes_per_sample(s-> in_sample_fmt);
 233     s->int_bps= av_get_bytes_per_sample(s->int_sample_fmt);
 234     s->out.bps= av_get_bytes_per_sample(s->out_sample_fmt);
 235
 236     if(!s->resample && !s->rematrix && !s->channel_map){
 237         s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt,
 238                                                    s-> in_sample_fmt, s-> in.ch_count, NULL, 0);
 239         return 0;
 240     }
 241
 242     s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt,
 243                                              s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0);
 244     s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt,
 245                                              s->int_sample_fmt, s->out.ch_count, NULL, 0);
 246
 247
 248     s->postin= s->in;
 249     s->preout= s->out;
 250     s->midbuf= s->in;
 251     s->in_buffer= s->in;
 252     if(s->channel_map){
 253         s->postin.ch_count=
 254         s->midbuf.ch_count=
 255         s->in_buffer.ch_count= s->used_ch_count;
 256     }
 257     if(!s->resample_first){
 258         s->midbuf.ch_count= s->out.ch_count;
 259         s->in_buffer.ch_count = s->out.ch_count;
 260     }
 261
 262     s->in_buffer.bps = s->postin.bps = s->midbuf.bps = s->preout.bps =  s->int_bps;
 263     s->in_buffer.planar = s->postin.planar = s->midbuf.planar = s->preout.planar =  1;
 264
 265
 266     if(s->rematrix)
 267         return swri_rematrix_init(s);
 268
 269     return 0;
 270 }
 271
 272 static int realloc_audio(AudioData *a, int count){
 273     int i, countb;
 274     AudioData old;
 275
 276     if(a->count >= count)
 277         return 0;
 278
 279     count*=2;
 280
 281     countb= FFALIGN(count*a->bps, 32);
 282     old= *a;
 283
 284     av_assert0(a->planar);
 285     av_assert0(a->bps);
 286     av_assert0(a->ch_count);
 287
 288     a->data= av_malloc(countb*a->ch_count);
 289     if(!a->data)
 290         return AVERROR(ENOMEM);
 291     for(i=0; i<a->ch_count; i++){
 292         a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
 293         if(a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
 294     }
 295     av_free(old.data);
 296     a->count= count;
 297
 298     return 1;
 299 }
 300
 301 static void copy(AudioData *out, AudioData *in,
 302                  int count){
 303     av_assert0(out->planar == in->planar);
 304     av_assert0(out->bps == in->bps);
 305     av_assert0(out->ch_count == in->ch_count);
 306     if(out->planar){
 307         int ch;
 308         for(ch=0; ch<out->ch_count; ch++)
 309             memcpy(out->ch[ch], in->ch[ch], count*out->bps);
 310     }else
 311         memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
 312 }
 313
 314 static void fill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 315     int i;
 316     if(out->planar){
 317         for(i=0; i<out->ch_count; i++)
 318             out->ch[i]= in_arg[i];
 319     }else{
 320         for(i=0; i<out->ch_count; i++)
 321             out->ch[i]= in_arg[0] + i*out->bps;
 322     }
 323 }
 324
 325 /**
 326  *
 327  * out may be equal in.
 328  */
 329 static void buf_set(AudioData *out, AudioData *in, int count){
 330     if(in->planar){
 331         int ch;
 332         for(ch=0; ch<out->ch_count; ch++)
 333             out->ch[ch]= in->ch[ch] + count*out->bps;
 334     }else
 335         out->ch[0]= in->ch[0] + count*out->ch_count*out->bps;
 336 }
 337
 338 /**
 339  *
 340  * @return number of samples output per channel
 341  */
 342 static int resample(SwrContext *s, AudioData *out_param, int out_count,
 343                              const AudioData * in_param, int in_count){
 344     AudioData in, out, tmp;
 345     int ret_sum=0;
 346     int border=0;
 347
 348     tmp=out=*out_param;
 349     in =  *in_param;
 350
 351     do{
 352         int ret, size, consumed;
 353         if(!s->resample_in_constraint && s->in_buffer_count){
 354             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 355             ret= swri_multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
 356             out_count -= ret;
 357             ret_sum += ret;
 358             buf_set(&out, &out, ret);
 359             s->in_buffer_count -= consumed;
 360             s->in_buffer_index += consumed;
 361
 362             if(!in_count)
 363                 break;
 364             if(s->in_buffer_count <= border){
 365                 buf_set(&in, &in, -s->in_buffer_count);
 366                 in_count += s->in_buffer_count;
 367                 s->in_buffer_count=0;
 368                 s->in_buffer_index=0;
 369                 border = 0;
 370             }
 371         }
 372
 373         if(in_count && !s->in_buffer_count){
 374             s->in_buffer_index=0;
 375             ret= swri_multiple_resample(s->resample, &out, out_count, &in, in_count, &consumed);
 376             out_count -= ret;
 377             ret_sum += ret;
 378             buf_set(&out, &out, ret);
 379             in_count -= consumed;
 380             buf_set(&in, &in, consumed);
 381         }
 382
 383         //TODO is this check sane considering the advanced copy avoidance below
 384         size= s->in_buffer_index + s->in_buffer_count + in_count;
 385         if(   size > s->in_buffer.count
 386            && s->in_buffer_count + in_count <= s->in_buffer_index){
 387             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 388             copy(&s->in_buffer, &tmp, s->in_buffer_count);
 389             s->in_buffer_index=0;
 390         }else
 391             if((ret=realloc_audio(&s->in_buffer, size)) < 0)
 392                 return ret;
 393
 394         if(in_count){
 395             int count= in_count;
 396             if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;
 397
 398             buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 399             copy(&tmp, &in, /*in_*/count);
 400             s->in_buffer_count += count;
 401             in_count -= count;
 402             border += count;
 403             buf_set(&in, &in, count);
 404             s->resample_in_constraint= 0;
 405             if(s->in_buffer_count != count || in_count)
 406                 continue;
 407         }
 408         break;
 409     }while(1);
 410
 411     s->resample_in_constraint= !!out_count;
 412
 413     return ret_sum;
 414 }
 415
 416 int swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
 417                          const uint8_t *in_arg [SWR_CH_MAX], int  in_count){
 418     AudioData *postin, *midbuf, *preout;
 419     int ret/*, in_max*/;
 420     AudioData * in= &s->in;
 421     AudioData *out= &s->out;
 422     AudioData preout_tmp, midbuf_tmp;
 423
 424     if(!s->resample){
 425         if(in_count > out_count)
 426             return -1;
 427         out_count = in_count;
 428     }
 429
 430     if(!in_arg){
 431         if(s->in_buffer_count){
 432             AudioData *a= &s->in_buffer;
 433             int i, j, ret;
 434             if((ret=realloc_audio(a, s->in_buffer_index + 2*s->in_buffer_count)) < 0)
 435                 return ret;
 436             av_assert0(a->planar);
 437             for(i=0; i<a->ch_count; i++){
 438                 for(j=0; j<s->in_buffer_count; j++){
 439                     memcpy(a->ch[i] + (s->in_buffer_index+s->in_buffer_count+j  )*a->bps,
 440                            a->ch[i] + (s->in_buffer_index+s->in_buffer_count-j-1)*a->bps, a->bps);
 441                 }
 442             }
 443             s->in_buffer_count += (s->in_buffer_count+1)/2;
 444             s->resample_in_constraint = 0;
 445         }else{
 446             return 0;
 447         }
 448     }else
 449         fill_audiodata(in ,  (void*)in_arg);
 450     fill_audiodata(out, out_arg);
 451
 452     if(s->full_convert){
 453         av_assert0(!s->resample);
 454         swri_audio_convert(s->full_convert, out, in, in_count);
 455         return out_count;
 456     }
 457
 458 //     in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
 459 //     in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);
 460
 461     if((ret=realloc_audio(&s->postin, in_count))<0)
 462         return ret;
 463     if(s->resample_first){
 464         av_assert0(s->midbuf.ch_count == s->used_ch_count);
 465         if((ret=realloc_audio(&s->midbuf, out_count))<0)
 466             return ret;
 467     }else{
 468         av_assert0(s->midbuf.ch_count ==  s->out.ch_count);
 469         if((ret=realloc_audio(&s->midbuf,  in_count))<0)
 470             return ret;
 471     }
 472     if((ret=realloc_audio(&s->preout, out_count))<0)
 473         return ret;
 474
 475     postin= &s->postin;
 476
 477     midbuf_tmp= s->midbuf;
 478     midbuf= &midbuf_tmp;
 479     preout_tmp= s->preout;
 480     preout= &preout_tmp;
 481
 482     if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar)
 483         postin= in;
 484
 485     if(s->resample_first ? !s->resample : !s->rematrix)
 486         midbuf= postin;
 487
 488     if(s->resample_first ? !s->rematrix : !s->resample)
 489         preout= midbuf;
 490
 491     if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar){
 492         if(preout==in){
 493             out_count= FFMIN(out_count, in_count); //TODO check at teh end if this is needed or redundant
 494             av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
 495             copy(out, in, out_count);
 496             return out_count;
 497         }
 498         else if(preout==postin) preout= midbuf= postin= out;
 499         else if(preout==midbuf) preout= midbuf= out;
 500         else                    preout= out;
 501     }
 502
 503     if(in != postin){
 504         swri_audio_convert(s->in_convert, postin, in, in_count);
 505     }
 506
 507     if(s->resample_first){
 508         if(postin != midbuf)
 509             out_count= resample(s, midbuf, out_count, postin, in_count);
 510         if(midbuf != preout)
 511             swri_rematrix(s, preout, midbuf, out_count, preout==out);
 512     }else{
 513         if(postin != midbuf)
 514             swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
 515         if(midbuf != preout)
 516             out_count= resample(s, preout, out_count, midbuf, in_count);
 517     }
 518
 519     if(preout != out){
 520 //FIXME packed doesnt need more than 1 chan here!
 521         swri_audio_convert(s->out_convert, out, preout, out_count);
 522     }
 523     if(!in_arg)
 524         s->in_buffer_count = 0;
 525     return out_count;
 526 }
 527