2 * Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
4 * This file is part of libswresample
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.
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.
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
21 #include "libavutil/opt.h"
22 #include "swresample_internal.h"
23 #include "audioconvert.h"
24 #include "libavutil/avassert.h"
27 #define C15DB 1.189207115
29 #define C_15DB 0.840896415
30 #define C_30DB M_SQRT1_2
31 #define C_45DB 0.594603558
35 //TODO split options array out?
36 #define OFFSET(x) offsetof(SwrContext,x)
37 static const AVOption options[]={
38 {"ich", "input channel count", OFFSET( in.ch_count ), FF_OPT_TYPE_INT, {.dbl=2}, 1, SWR_CH_MAX, 0},
39 {"och", "output channel count", OFFSET(out.ch_count ), FF_OPT_TYPE_INT, {.dbl=2}, 1, SWR_CH_MAX, 0},
40 {"isr", "input sample rate" , OFFSET( in_sample_rate), FF_OPT_TYPE_INT, {.dbl=48000}, 1, INT_MAX, 0},
41 {"osr", "output sample rate" , OFFSET(out_sample_rate), FF_OPT_TYPE_INT, {.dbl=48000}, 1, INT_MAX, 0},
42 {"ip" , "input planar" , OFFSET( in.planar ), FF_OPT_TYPE_INT, {.dbl=0}, 0, 1, 0},
43 {"op" , "output planar" , OFFSET(out.planar ), FF_OPT_TYPE_INT, {.dbl=0}, 0, 1, 0},
44 {"isf", "input sample format", OFFSET( in_sample_fmt ), FF_OPT_TYPE_INT, {.dbl=AV_SAMPLE_FMT_S16}, 0, AV_SAMPLE_FMT_NB-1, 0},
45 {"osf", "output sample format", OFFSET(out_sample_fmt ), FF_OPT_TYPE_INT, {.dbl=AV_SAMPLE_FMT_S16}, 0, AV_SAMPLE_FMT_NB-1, 0},
46 {"tsf", "internal sample format", OFFSET(int_sample_fmt ), FF_OPT_TYPE_INT, {.dbl=AV_SAMPLE_FMT_NONE}, -1, AV_SAMPLE_FMT_FLT, 0},
47 {"icl", "input channel layout" , OFFSET( in_ch_layout), FF_OPT_TYPE_INT64, {.dbl=0}, 0, INT64_MAX, 0, "channel_layout"},
48 {"ocl", "output channel layout", OFFSET(out_ch_layout), FF_OPT_TYPE_INT64, {.dbl=0}, 0, INT64_MAX, 0, "channel_layout"},
49 {"clev", "center mix level" , OFFSET(clev) , FF_OPT_TYPE_FLOAT, {.dbl=C_30DB}, 0, 4, 0},
50 {"slev", "sourround mix level" , OFFSET(slev) , FF_OPT_TYPE_FLOAT, {.dbl=C_30DB}, 0, 4, 0},
51 {"flags", NULL , OFFSET(flags) , FF_OPT_TYPE_FLAGS, {.dbl=0}, 0, UINT_MAX, 0, "flags"},
52 {"res", "force resampling", 0, FF_OPT_TYPE_CONST, {.dbl=SWR_FLAG_RESAMPLE}, INT_MIN, INT_MAX, 0, "flags"},
57 static const char* context_to_name(void* ptr) {
61 static const AVClass av_class = { "SwrContext", context_to_name, options, LIBAVUTIL_VERSION_INT, OFFSET(log_level_offset), OFFSET(log_ctx) };
63 static int resample(SwrContext *s, AudioData *out_param, int out_count,
64 const AudioData * in_param, int in_count);
66 SwrContext *swr_alloc(void){
67 SwrContext *s= av_mallocz(sizeof(SwrContext));
69 s->av_class= &av_class;
70 av_opt_set_defaults2(s, 0, 0);
75 SwrContext *swr_alloc2(struct SwrContext *s, int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
76 int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate,
77 int log_offset, void *log_ctx){
78 if(!s) s= swr_alloc();
81 s->log_level_offset= log_offset;
84 av_set_int(s, "ocl", out_ch_layout);
85 av_set_int(s, "osf", out_sample_fmt);
86 av_set_int(s, "osr", out_sample_rate);
87 av_set_int(s, "icl", in_ch_layout);
88 av_set_int(s, "isf", in_sample_fmt);
89 av_set_int(s, "isr", in_sample_rate);
91 s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
92 s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
93 s->int_sample_fmt = AV_SAMPLE_FMT_S16;
99 static void free_temp(AudioData *a){
101 memset(a, 0, sizeof(*a));
104 void swr_free(SwrContext **ss){
107 free_temp(&s->postin);
108 free_temp(&s->midbuf);
109 free_temp(&s->preout);
110 free_temp(&s->in_buffer);
111 swr_audio_convert_free(&s-> in_convert);
112 swr_audio_convert_free(&s->out_convert);
113 swr_resample_free(&s->resample);
119 static int64_t guess_layout(int ch){
121 case 1: return AV_CH_LAYOUT_MONO;
122 case 2: return AV_CH_LAYOUT_STEREO;
123 case 5: return AV_CH_LAYOUT_5POINT0;
124 case 6: return AV_CH_LAYOUT_5POINT1;
125 case 7: return AV_CH_LAYOUT_7POINT0;
126 case 8: return AV_CH_LAYOUT_7POINT1;
131 int swr_init(SwrContext *s){
132 s->in_buffer_index= 0;
133 s->in_buffer_count= 0;
134 s->resample_in_constraint= 0;
135 free_temp(&s->postin);
136 free_temp(&s->midbuf);
137 free_temp(&s->preout);
138 free_temp(&s->in_buffer);
139 swr_audio_convert_free(&s-> in_convert);
140 swr_audio_convert_free(&s->out_convert);
142 //We assume AVOptions checked the various values and the defaults where allowed
143 if( s->int_sample_fmt != AV_SAMPLE_FMT_S16
144 &&s->int_sample_fmt != AV_SAMPLE_FMT_FLT){
145 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));
146 return AVERROR(EINVAL);
149 //FIXME should we allow/support using FLT on material that doesnt need it ?
150 if(s->in_sample_fmt <= AV_SAMPLE_FMT_S16 || s->int_sample_fmt==AV_SAMPLE_FMT_S16){
151 s->int_sample_fmt= AV_SAMPLE_FMT_S16;
153 s->int_sample_fmt= AV_SAMPLE_FMT_FLT;
156 if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
157 s->resample = swr_resample_init(s->resample, s->out_sample_rate, s->in_sample_rate, 16, 10, 0, 0.8);
159 swr_resample_free(&s->resample);
160 if(s->int_sample_fmt != AV_SAMPLE_FMT_S16 && s->resample){
161 av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16 currently\n"); //FIXME
165 if(!s-> in_ch_layout)
166 s-> in_ch_layout= guess_layout(s->in.ch_count);
167 if(!s->out_ch_layout)
168 s->out_ch_layout= guess_layout(s->out.ch_count);
170 s->rematrix= s->out_ch_layout !=s->in_ch_layout;
172 #define RSC 1 //FIXME finetune
174 s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
176 s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
178 av_assert0(s-> in.ch_count);
179 av_assert0(s->out.ch_count);
180 s->resample_first= RSC*s->out.ch_count/s->in.ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;
182 s-> in.bps= av_get_bits_per_sample_fmt(s-> in_sample_fmt)/8;
183 s->int_bps= av_get_bits_per_sample_fmt(s->int_sample_fmt)/8;
184 s->out.bps= av_get_bits_per_sample_fmt(s->out_sample_fmt)/8;
186 s->in_convert = swr_audio_convert_alloc(s->int_sample_fmt,
187 s-> in_sample_fmt, s-> in.ch_count, 0);
188 s->out_convert= swr_audio_convert_alloc(s->out_sample_fmt,
189 s->int_sample_fmt, s->out.ch_count, 0);
196 if(!s->resample_first){
197 s->midbuf.ch_count= s->out.ch_count;
198 s->in_buffer.ch_count = s->out.ch_count;
201 s->in_buffer.bps = s->postin.bps = s->midbuf.bps = s->preout.bps = s->int_bps;
202 s->in_buffer.planar = s->postin.planar = s->midbuf.planar = s->preout.planar = 1;
205 if(s->rematrix && swr_rematrix_init(s)<0)
211 static int realloc_audio(AudioData *a, int count){
215 if(a->count >= count)
220 countb= FFALIGN(count*a->bps, 32);
223 av_assert0(a->planar);
225 av_assert0(a->ch_count);
227 a->data= av_malloc(countb*a->ch_count);
229 return AVERROR(ENOMEM);
230 for(i=0; i<a->ch_count; i++){
231 a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
232 if(a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
240 static void copy(AudioData *out, AudioData *in,
242 av_assert0(out->planar == in->planar);
243 av_assert0(out->bps == in->bps);
244 av_assert0(out->ch_count == in->ch_count);
247 for(ch=0; ch<out->ch_count; ch++)
248 memcpy(out->ch[ch], in->ch[ch], count*out->bps);
250 memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
253 int swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
254 const uint8_t *in_arg [SWR_CH_MAX], int in_count){
255 AudioData *postin, *midbuf, *preout;
256 int ret, i/*, in_max*/;
257 AudioData * in= &s->in;
258 AudioData *out= &s->out;
259 AudioData preout_tmp, midbuf_tmp;
262 if(in_count > out_count)
264 out_count = in_count;
267 av_assert0(in ->planar == 0);
268 av_assert0(out->planar == 0);
269 for(i=0; i<s-> in.ch_count; i++)
270 in ->ch[i]= in_arg[0] + i* in->bps;
271 for(i=0; i<s->out.ch_count; i++)
272 out->ch[i]= out_arg[0] + i*out->bps;
274 // in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
275 // in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);
277 if((ret=realloc_audio(&s->postin, in_count))<0)
279 if(s->resample_first){
280 av_assert0(s->midbuf.ch_count == s-> in.ch_count);
281 if((ret=realloc_audio(&s->midbuf, out_count))<0)
284 av_assert0(s->midbuf.ch_count == s->out.ch_count);
285 if((ret=realloc_audio(&s->midbuf, in_count))<0)
288 if((ret=realloc_audio(&s->preout, out_count))<0)
293 midbuf_tmp= s->midbuf;
295 preout_tmp= s->preout;
298 if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar)
301 if(s->resample_first ? !s->resample : !s->rematrix)
304 if(s->resample_first ? !s->rematrix : !s->resample)
307 if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar){
309 out_count= FFMIN(out_count, in_count); //TODO check at teh end if this is needed or redundant
310 av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
311 copy(out, in, out_count);
314 else if(preout==postin) preout= midbuf= postin= out;
315 else if(preout==midbuf) preout= midbuf= out;
320 swr_audio_convert(s->in_convert, postin, in, in_count);
323 if(s->resample_first){
325 out_count= resample(s, midbuf, out_count, postin, in_count);
327 swr_rematrix(s, preout, midbuf, out_count, preout==out);
330 swr_rematrix(s, midbuf, postin, in_count, midbuf==out);
332 out_count= resample(s, preout, out_count, midbuf, in_count);
336 //FIXME packed doesnt need more than 1 chan here!
337 swr_audio_convert(s->out_convert, out, preout, out_count);
344 * out may be equal in.
346 static void buf_set(AudioData *out, AudioData *in, int count){
349 for(ch=0; ch<out->ch_count; ch++)
350 out->ch[ch]= in->ch[ch] + count*out->bps;
352 out->ch[0]= in->ch[0] + count*out->ch_count*out->bps;
357 * @return number of samples output per channel
359 static int resample(SwrContext *s, AudioData *out_param, int out_count,
360 const AudioData * in_param, int in_count){
361 AudioData in, out, tmp;
364 int ch_count= s->resample_first ? s->in.ch_count : s->out.ch_count;
370 int ret, size, consumed;
371 if(!s->resample_in_constraint && s->in_buffer_count){
372 buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
373 ret= swr_multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
376 buf_set(&out, &out, ret);
377 s->in_buffer_count -= consumed;
378 s->in_buffer_index += consumed;
382 if(s->in_buffer_count <= border){
383 buf_set(&in, &in, -s->in_buffer_count);
384 in_count += s->in_buffer_count;
385 s->in_buffer_count=0;
386 s->in_buffer_index=0;
391 if(in_count && !s->in_buffer_count){
392 s->in_buffer_index=0;
393 ret= swr_multiple_resample(s->resample, &out, out_count, &in, in_count, &consumed);
396 buf_set(&out, &out, ret);
397 in_count -= consumed;
398 buf_set(&in, &in, consumed);
401 //TODO is this check sane considering the advanced copy avoidance below
402 size= s->in_buffer_index + s->in_buffer_count + in_count;
403 if( size > s->in_buffer.count
404 && s->in_buffer_count + in_count <= s->in_buffer_index){
405 buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
406 copy(&s->in_buffer, &tmp, s->in_buffer_count);
407 s->in_buffer_index=0;
409 if((ret=realloc_audio(&s->in_buffer, size)) < 0)
414 if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;
416 buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
417 copy(&tmp, &in, /*in_*/count);
418 s->in_buffer_count += count;
421 buf_set(&in, &in, count);
422 s->resample_in_constraint= 0;
423 if(s->in_buffer_count != count || in_count)
429 s->resample_in_constraint= !!out_count;