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 int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map){
  74     if(!s || s->in_convert) // s needs to be allocated but not initialized
  75         return AVERROR(EINVAL);
  76     s->channel_map = channel_map;
  77     return 0;
  78 }
  79
  80 struct SwrContext *swr_alloc(void){
  81     SwrContext *s= av_mallocz(sizeof(SwrContext));
  82     if(s){
  83         s->av_class= &av_class;
  84         av_opt_set_defaults(s);
  85     }
  86     return s;
  87 }
  88
  89 struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
  90                                       int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
  91                                       int64_t  in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
  92                                       int log_offset, void *log_ctx){
  93     if(!s) s= swr_alloc();
  94     if(!s) return NULL;
  95
  96     s->log_level_offset= log_offset;
  97     s->log_ctx= log_ctx;
  98
  99     av_opt_set_int(s, "ocl", out_ch_layout,   0);
 100     av_opt_set_int(s, "osf", out_sample_fmt,  0);
 101     av_opt_set_int(s, "osr", out_sample_rate, 0);
 102     av_opt_set_int(s, "icl", in_ch_layout,    0);
 103     av_opt_set_int(s, "isf", in_sample_fmt,   0);
 104     av_opt_set_int(s, "isr", in_sample_rate,  0);
 105     av_opt_set_int(s, "tsf", AV_SAMPLE_FMT_S16, 0);
 106     av_opt_set_int(s, "ich", av_get_channel_layout_nb_channels(s-> in_ch_layout), 0);
 107     av_opt_set_int(s, "och", av_get_channel_layout_nb_channels(s->out_ch_layout), 0);
 108     av_opt_set_int(s, "uch", 0, 0);
 109     return s;
 110 }
 111
 112
 113 static void free_temp(AudioData *a){
 114     av_free(a->data);
 115     memset(a, 0, sizeof(*a));
 116 }
 117
 118 void swr_free(SwrContext **ss){
 119     SwrContext *s= *ss;
 120     if(s){
 121         free_temp(&s->postin);
 122         free_temp(&s->midbuf);
 123         free_temp(&s->preout);
 124         free_temp(&s->in_buffer);
 125         swri_audio_convert_free(&s-> in_convert);
 126         swri_audio_convert_free(&s->out_convert);
 127         swri_audio_convert_free(&s->full_convert);
 128         swri_resample_free(&s->resample);
 129     }
 130
 131     av_freep(ss);
 132 }
 133
 134 int swr_init(struct SwrContext *s){
 135     s->in_buffer_index= 0;
 136     s->in_buffer_count= 0;
 137     s->resample_in_constraint= 0;
 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
 146     s-> in.planar= av_sample_fmt_is_planar(s-> in_sample_fmt);
 147     s->out.planar= av_sample_fmt_is_planar(s->out_sample_fmt);
 148     s-> in_sample_fmt= av_get_alt_sample_fmt(s-> in_sample_fmt, 0);
 149     s->out_sample_fmt= av_get_alt_sample_fmt(s->out_sample_fmt, 0);
 150
 151     if(s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
 152         av_log(s, AV_LOG_ERROR, "Requested input sample format %d is invalid\n", s->in_sample_fmt);
 153         return AVERROR(EINVAL);
 154     }
 155     if(s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
 156         av_log(s, AV_LOG_ERROR, "Requested output sample format %d is invalid\n", s->out_sample_fmt);
 157         return AVERROR(EINVAL);
 158     }
 159
 160     if(   s->int_sample_fmt != AV_SAMPLE_FMT_S16
 161         &&s->int_sample_fmt != AV_SAMPLE_FMT_FLT){
 162         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));
 163         return AVERROR(EINVAL);
 164     }
 165
 166     //FIXME should we allow/support using FLT on material that doesnt need it ?
 167     if(s->in_sample_fmt <= AV_SAMPLE_FMT_S16 || s->int_sample_fmt==AV_SAMPLE_FMT_S16){
 168         s->int_sample_fmt= AV_SAMPLE_FMT_S16;
 169     }else
 170         s->int_sample_fmt= AV_SAMPLE_FMT_FLT;
 171
 172
 173     if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
 174         s->resample = swri_resample_init(s->resample, s->out_sample_rate, s->in_sample_rate, 16, 10, 0, 0.8);
 175     }else
 176         swri_resample_free(&s->resample);
 177     if(s->int_sample_fmt != AV_SAMPLE_FMT_S16 && s->resample){
 178         av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16 currently\n"); //FIXME
 179         return -1;
 180     }
 181
 182     if(!s->used_ch_count)
 183         s->used_ch_count= s->in.ch_count;
 184
 185     if(s->used_ch_count && s-> in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s-> in_ch_layout)){
 186         av_log(s, AV_LOG_WARNING, "Input channel layout has a different number of channels than the number of used channels, ignoring layout\n");
 187         s-> in_ch_layout= 0;
 188     }
 189
 190     if(!s-> in_ch_layout)
 191         s-> in_ch_layout= av_get_default_channel_layout(s->used_ch_count);
 192     if(!s->out_ch_layout)
 193         s->out_ch_layout= av_get_default_channel_layout(s->out.ch_count);
 194
 195     s->rematrix= s->out_ch_layout  !=s->in_ch_layout || s->rematrix_volume!=1.0;
 196
 197 #define RSC 1 //FIXME finetune
 198     if(!s-> in.ch_count)
 199         s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
 200     if(!s->used_ch_count)
 201         s->used_ch_count= s->in.ch_count;
 202     if(!s->out.ch_count)
 203         s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
 204
 205 av_assert0(s-> in.ch_count);
 206 av_assert0(s->used_ch_count);
 207 av_assert0(s->out.ch_count);
 208     s->resample_first= RSC*s->out.ch_count/s->in.ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;
 209
 210     s-> in.bps= av_get_bytes_per_sample(s-> in_sample_fmt);
 211     s->int_bps= av_get_bytes_per_sample(s->int_sample_fmt);
 212     s->out.bps= av_get_bytes_per_sample(s->out_sample_fmt);
 213
 214     if(!s->resample && !s->rematrix && !s->channel_map){
 215         s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt,
 216                                                    s-> in_sample_fmt, s-> in.ch_count, NULL, 0);
 217         return 0;
 218     }
 219
 220     s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt,
 221                                              s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0);
 222     s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt,
 223                                              s->int_sample_fmt, s->out.ch_count, NULL, 0);
 224
 225
 226     s->postin= s->in;
 227     s->preout= s->out;
 228     s->midbuf= s->in;
 229     s->in_buffer= s->in;
 230     if(s->channel_map){
 231         s->postin.ch_count=
 232         s->midbuf.ch_count=
 233         s->in_buffer.ch_count= s->used_ch_count;
 234     }
 235     if(!s->resample_first){
 236         s->midbuf.ch_count= s->out.ch_count;
 237         s->in_buffer.ch_count = s->out.ch_count;
 238     }
 239
 240     s->in_buffer.bps = s->postin.bps = s->midbuf.bps = s->preout.bps =  s->int_bps;
 241     s->in_buffer.planar = s->postin.planar = s->midbuf.planar = s->preout.planar =  1;
 242
 243
 244     if(s->rematrix)
 245         return swri_rematrix_init(s);
 246
 247     return 0;
 248 }
 249
 250 static int realloc_audio(AudioData *a, int count){
 251     int i, countb;
 252     AudioData old;
 253
 254     if(a->count >= count)
 255         return 0;
 256
 257     count*=2;
 258
 259     countb= FFALIGN(count*a->bps, 32);
 260     old= *a;
 261
 262     av_assert0(a->planar);
 263     av_assert0(a->bps);
 264     av_assert0(a->ch_count);
 265
 266     a->data= av_malloc(countb*a->ch_count);
 267     if(!a->data)
 268         return AVERROR(ENOMEM);
 269     for(i=0; i<a->ch_count; i++){
 270         a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
 271         if(a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
 272     }
 273     av_free(old.data);
 274     a->count= count;
 275
 276     return 1;
 277 }
 278
 279 static void copy(AudioData *out, AudioData *in,
 280                  int count){
 281     av_assert0(out->planar == in->planar);
 282     av_assert0(out->bps == in->bps);
 283     av_assert0(out->ch_count == in->ch_count);
 284     if(out->planar){
 285         int ch;
 286         for(ch=0; ch<out->ch_count; ch++)
 287             memcpy(out->ch[ch], in->ch[ch], count*out->bps);
 288     }else
 289         memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
 290 }
 291
 292 static void fill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
 293     int i;
 294     if(out->planar){
 295         for(i=0; i<out->ch_count; i++)
 296             out->ch[i]= in_arg[i];
 297     }else{
 298         for(i=0; i<out->ch_count; i++)
 299             out->ch[i]= in_arg[0] + i*out->bps;
 300     }
 301 }
 302
 303 /**
 304  *
 305  * out may be equal in.
 306  */
 307 static void buf_set(AudioData *out, AudioData *in, int count){
 308     if(in->planar){
 309         int ch;
 310         for(ch=0; ch<out->ch_count; ch++)
 311             out->ch[ch]= in->ch[ch] + count*out->bps;
 312     }else
 313         out->ch[0]= in->ch[0] + count*out->ch_count*out->bps;
 314 }
 315
 316 /**
 317  *
 318  * @return number of samples output per channel
 319  */
 320 static int resample(SwrContext *s, AudioData *out_param, int out_count,
 321                              const AudioData * in_param, int in_count){
 322     AudioData in, out, tmp;
 323     int ret_sum=0;
 324     int border=0;
 325
 326     tmp=out=*out_param;
 327     in =  *in_param;
 328
 329     do{
 330         int ret, size, consumed;
 331         if(!s->resample_in_constraint && s->in_buffer_count){
 332             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 333             ret= swri_multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
 334             out_count -= ret;
 335             ret_sum += ret;
 336             buf_set(&out, &out, ret);
 337             s->in_buffer_count -= consumed;
 338             s->in_buffer_index += consumed;
 339
 340             if(!in_count)
 341                 break;
 342             if(s->in_buffer_count <= border){
 343                 buf_set(&in, &in, -s->in_buffer_count);
 344                 in_count += s->in_buffer_count;
 345                 s->in_buffer_count=0;
 346                 s->in_buffer_index=0;
 347                 border = 0;
 348             }
 349         }
 350
 351         if(in_count && !s->in_buffer_count){
 352             s->in_buffer_index=0;
 353             ret= swri_multiple_resample(s->resample, &out, out_count, &in, in_count, &consumed);
 354             out_count -= ret;
 355             ret_sum += ret;
 356             buf_set(&out, &out, ret);
 357             in_count -= consumed;
 358             buf_set(&in, &in, consumed);
 359         }
 360
 361         //TODO is this check sane considering the advanced copy avoidance below
 362         size= s->in_buffer_index + s->in_buffer_count + in_count;
 363         if(   size > s->in_buffer.count
 364            && s->in_buffer_count + in_count <= s->in_buffer_index){
 365             buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
 366             copy(&s->in_buffer, &tmp, s->in_buffer_count);
 367             s->in_buffer_index=0;
 368         }else
 369             if((ret=realloc_audio(&s->in_buffer, size)) < 0)
 370                 return ret;
 371
 372         if(in_count){
 373             int count= in_count;
 374             if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;
 375
 376             buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
 377             copy(&tmp, &in, /*in_*/count);
 378             s->in_buffer_count += count;
 379             in_count -= count;
 380             border += count;
 381             buf_set(&in, &in, count);
 382             s->resample_in_constraint= 0;
 383             if(s->in_buffer_count != count || in_count)
 384                 continue;
 385         }
 386         break;
 387     }while(1);
 388
 389     s->resample_in_constraint= !!out_count;
 390
 391     return ret_sum;
 392 }
 393
 394 int swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
 395                          const uint8_t *in_arg [SWR_CH_MAX], int  in_count){
 396     AudioData *postin, *midbuf, *preout;
 397     int ret/*, in_max*/;
 398     AudioData * in= &s->in;
 399     AudioData *out= &s->out;
 400     AudioData preout_tmp, midbuf_tmp;
 401
 402     if(!s->resample){
 403         if(in_count > out_count)
 404             return -1;
 405         out_count = in_count;
 406     }
 407
 408     if(!in_arg){
 409         if(s->in_buffer_count){
 410             AudioData *a= &s->in_buffer;
 411             int i, j, ret;
 412             if((ret=realloc_audio(a, s->in_buffer_index + 2*s->in_buffer_count)) < 0)
 413                 return ret;
 414             av_assert0(a->planar);
 415             for(i=0; i<a->ch_count; i++){
 416                 for(j=0; j<s->in_buffer_count; j++){
 417                     memcpy(a->ch[i] + (s->in_buffer_index+s->in_buffer_count+j  )*a->bps,
 418                            a->ch[i] + (s->in_buffer_index+s->in_buffer_count-j-1)*a->bps, a->bps);
 419                 }
 420             }
 421             s->in_buffer_count += (s->in_buffer_count+1)/2;
 422             s->resample_in_constraint = 0;
 423         }else{
 424             return 0;
 425         }
 426     }else
 427         fill_audiodata(in ,  (void*)in_arg);
 428     fill_audiodata(out, out_arg);
 429
 430     if(s->full_convert){
 431         av_assert0(!s->resample);
 432         swri_audio_convert(s->full_convert, out, in, in_count);
 433         return out_count;
 434     }
 435
 436 //     in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
 437 //     in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);
 438
 439     if((ret=realloc_audio(&s->postin, in_count))<0)
 440         return ret;
 441     if(s->resample_first){
 442         av_assert0(s->midbuf.ch_count == s->used_ch_count);
 443         if((ret=realloc_audio(&s->midbuf, out_count))<0)
 444             return ret;
 445     }else{
 446         av_assert0(s->midbuf.ch_count ==  s->out.ch_count);
 447         if((ret=realloc_audio(&s->midbuf,  in_count))<0)
 448             return ret;
 449     }
 450     if((ret=realloc_audio(&s->preout, out_count))<0)
 451         return ret;
 452
 453     postin= &s->postin;
 454
 455     midbuf_tmp= s->midbuf;
 456     midbuf= &midbuf_tmp;
 457     preout_tmp= s->preout;
 458     preout= &preout_tmp;
 459
 460     if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar)
 461         postin= in;
 462
 463     if(s->resample_first ? !s->resample : !s->rematrix)
 464         midbuf= postin;
 465
 466     if(s->resample_first ? !s->rematrix : !s->resample)
 467         preout= midbuf;
 468
 469     if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar){
 470         if(preout==in){
 471             out_count= FFMIN(out_count, in_count); //TODO check at teh end if this is needed or redundant
 472             av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
 473             copy(out, in, out_count);
 474             return out_count;
 475         }
 476         else if(preout==postin) preout= midbuf= postin= out;
 477         else if(preout==midbuf) preout= midbuf= out;
 478         else                    preout= out;
 479     }
 480
 481     if(in != postin){
 482         swri_audio_convert(s->in_convert, postin, in, in_count);
 483     }
 484
 485     if(s->resample_first){
 486         if(postin != midbuf)
 487             out_count= resample(s, midbuf, out_count, postin, in_count);
 488         if(midbuf != preout)
 489             swri_rematrix(s, preout, midbuf, out_count, preout==out);
 490     }else{
 491         if(postin != midbuf)
 492             swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
 493         if(midbuf != preout)
 494             out_count= resample(s, preout, out_count, midbuf, in_count);
 495     }
 496
 497     if(preout != out){
 498 //FIXME packed doesnt need more than 1 chan here!
 499         swri_audio_convert(s->out_convert, out, preout, out_count);
 500     }
 501     if(!in_arg)
 502         s->in_buffer_count = 0;
 503     return out_count;
 504 }
 505