swresample: set the default parameters to "none"
[ffmpeg.git] / libswresample / swresample.c
1 /*
2  * Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
3  *
4  * This file is part of libswresample
5  *
6  * libswresample is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * libswresample is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with libswresample; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20
21 #include "libavutil/opt.h"
22 #include "swresample_internal.h"
23 #include "audioconvert.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/audioconvert.h"
26
27 #define  C30DB  M_SQRT2
28 #define  C15DB  1.189207115
29 #define C__0DB  1.0
30 #define C_15DB  0.840896415
31 #define C_30DB  M_SQRT1_2
32 #define C_45DB  0.594603558
33 #define C_60DB  0.5
34
35
36 //TODO split options array out?
37 #define OFFSET(x) offsetof(SwrContext,x)
38 #define PARAM AV_OPT_FLAG_AUDIO_PARAM
39
40 static const AVOption options[]={
41 {"ich"                  ,  "Input Channel Count"        , OFFSET( in.ch_count   ), AV_OPT_TYPE_INT  , {.dbl=2                     }, 0      , SWR_CH_MAX, PARAM},
42 {"in_channel_count"     ,  "Input Channel Count"        , OFFSET( in.ch_count   ), AV_OPT_TYPE_INT  , {.dbl=2                     }, 0      , SWR_CH_MAX, PARAM},
43 {"och"                  , "Output Channel Count"        , OFFSET(out.ch_count   ), AV_OPT_TYPE_INT  , {.dbl=2                     }, 0      , SWR_CH_MAX, PARAM},
44 {"out_channel_count"    , "Output Channel Count"        , OFFSET(out.ch_count   ), AV_OPT_TYPE_INT  , {.dbl=2                     }, 0      , SWR_CH_MAX, PARAM},
45 {"uch"                  ,   "Used Channel Count"        , OFFSET(used_ch_count  ), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , SWR_CH_MAX, PARAM},
46 {"used_channel_count"   ,   "Used Channel Count"        , OFFSET(used_ch_count  ), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , SWR_CH_MAX, PARAM},
47 {"isr"                  ,  "Input Sample Rate"          , OFFSET( in_sample_rate), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , INT_MAX   , PARAM},
48 {"in_sample_rate"       ,  "Input Sample Rate"          , OFFSET( in_sample_rate), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , INT_MAX   , PARAM},
49 {"osr"                  , "Output Sample Rate"          , OFFSET(out_sample_rate), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , INT_MAX   , PARAM},
50 {"out_sample_rate"      , "Output Sample Rate"          , OFFSET(out_sample_rate), AV_OPT_TYPE_INT  , {.dbl=0                     }, 0      , INT_MAX   , PARAM},
51 {"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},
52 {"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},
53 {"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},
54 {"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},
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