2 * Copyright (C) 2011-2013 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"
25 #include "libavutil/channel_layout.h"
26 #include "libavutil/internal.h"
32 #include "libavutil/ffversion.h"
33 const char swr_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
35 unsigned swresample_version(void)
37 av_assert0(LIBSWRESAMPLE_VERSION_MICRO >= 100);
38 return LIBSWRESAMPLE_VERSION_INT;
41 const char *swresample_configuration(void)
43 return FFMPEG_CONFIGURATION;
46 const char *swresample_license(void)
48 #define LICENSE_PREFIX "libswresample license: "
49 return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
52 int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map){
53 if(!s || s->in_convert) // s needs to be allocated but not initialized
54 return AVERROR(EINVAL);
55 s->channel_map = channel_map;
59 struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
60 int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
61 int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate,
62 int log_offset, void *log_ctx){
63 if(!s) s= swr_alloc();
66 s->log_level_offset= log_offset;
69 if (av_opt_set_int(s, "ocl", out_ch_layout, 0) < 0)
72 if (av_opt_set_int(s, "osf", out_sample_fmt, 0) < 0)
75 if (av_opt_set_int(s, "osr", out_sample_rate, 0) < 0)
78 if (av_opt_set_int(s, "icl", in_ch_layout, 0) < 0)
81 if (av_opt_set_int(s, "isf", in_sample_fmt, 0) < 0)
84 if (av_opt_set_int(s, "isr", in_sample_rate, 0) < 0)
87 if (av_opt_set_int(s, "tsf", AV_SAMPLE_FMT_NONE, 0) < 0)
90 if (av_opt_set_int(s, "ich", av_get_channel_layout_nb_channels(s-> user_in_ch_layout), 0) < 0)
93 if (av_opt_set_int(s, "och", av_get_channel_layout_nb_channels(s->user_out_ch_layout), 0) < 0)
96 av_opt_set_int(s, "uch", 0, 0);
99 av_log(s, AV_LOG_ERROR, "Failed to set option\n");
104 static void set_audiodata_fmt(AudioData *a, enum AVSampleFormat fmt){
106 a->bps = av_get_bytes_per_sample(fmt);
107 a->planar= av_sample_fmt_is_planar(fmt);
108 if (a->ch_count == 1)
112 static void free_temp(AudioData *a){
114 memset(a, 0, sizeof(*a));
117 static void clear_context(SwrContext *s){
118 s->in_buffer_index= 0;
119 s->in_buffer_count= 0;
120 s->resample_in_constraint= 0;
121 memset(s->in.ch, 0, sizeof(s->in.ch));
122 memset(s->out.ch, 0, sizeof(s->out.ch));
123 free_temp(&s->postin);
124 free_temp(&s->midbuf);
125 free_temp(&s->preout);
126 free_temp(&s->in_buffer);
127 free_temp(&s->silence);
128 free_temp(&s->drop_temp);
129 free_temp(&s->dither.noise);
130 free_temp(&s->dither.temp);
131 swri_audio_convert_free(&s-> in_convert);
132 swri_audio_convert_free(&s->out_convert);
133 swri_audio_convert_free(&s->full_convert);
134 swri_rematrix_free(s);
139 av_cold void swr_free(SwrContext **ss){
144 s->resampler->free(&s->resample);
150 av_cold void swr_close(SwrContext *s){
154 av_cold int swr_init(struct SwrContext *s){
156 char l1[1024], l2[1024];
160 if(s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
161 av_log(s, AV_LOG_ERROR, "Requested input sample format %d is invalid\n", s->in_sample_fmt);
162 return AVERROR(EINVAL);
164 if(s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
165 av_log(s, AV_LOG_ERROR, "Requested output sample format %d is invalid\n", s->out_sample_fmt);
166 return AVERROR(EINVAL);
169 s->out.ch_count = s-> user_out_ch_count;
170 s-> in.ch_count = s-> user_in_ch_count;
171 s->used_ch_count = s->user_used_ch_count;
173 s-> in_ch_layout = s-> user_in_ch_layout;
174 s->out_ch_layout = s->user_out_ch_layout;
176 if(av_get_channel_layout_nb_channels(s-> in_ch_layout) > SWR_CH_MAX) {
177 av_log(s, AV_LOG_WARNING, "Input channel layout 0x%"PRIx64" is invalid or unsupported.\n", s-> in_ch_layout);
181 if(av_get_channel_layout_nb_channels(s->out_ch_layout) > SWR_CH_MAX) {
182 av_log(s, AV_LOG_WARNING, "Output channel layout 0x%"PRIx64" is invalid or unsupported.\n", s->out_ch_layout);
183 s->out_ch_layout = 0;
188 case SWR_ENGINE_SOXR: s->resampler = &swri_soxr_resampler; break;
190 case SWR_ENGINE_SWR : s->resampler = &swri_resampler; break;
192 av_log(s, AV_LOG_ERROR, "Requested resampling engine is unavailable\n");
193 return AVERROR(EINVAL);
196 if(!s->used_ch_count)
197 s->used_ch_count= s->in.ch_count;
199 if(s->used_ch_count && s-> in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s-> in_ch_layout)){
200 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 if(!s-> in_ch_layout)
205 s-> in_ch_layout= av_get_default_channel_layout(s->used_ch_count);
206 if(!s->out_ch_layout)
207 s->out_ch_layout= av_get_default_channel_layout(s->out.ch_count);
209 s->rematrix= s->out_ch_layout !=s->in_ch_layout || s->rematrix_volume!=1.0 ||
212 if(s->int_sample_fmt == AV_SAMPLE_FMT_NONE){
213 if(av_get_planar_sample_fmt(s->in_sample_fmt) <= AV_SAMPLE_FMT_S16P){
214 s->int_sample_fmt= AV_SAMPLE_FMT_S16P;
215 }else if( av_get_planar_sample_fmt(s-> in_sample_fmt) == AV_SAMPLE_FMT_S32P
216 && av_get_planar_sample_fmt(s->out_sample_fmt) == AV_SAMPLE_FMT_S32P
218 && s->engine != SWR_ENGINE_SOXR){
219 s->int_sample_fmt= AV_SAMPLE_FMT_S32P;
220 }else if(av_get_planar_sample_fmt(s->in_sample_fmt) <= AV_SAMPLE_FMT_FLTP){
221 s->int_sample_fmt= AV_SAMPLE_FMT_FLTP;
223 av_log(s, AV_LOG_DEBUG, "Using double precision mode\n");
224 s->int_sample_fmt= AV_SAMPLE_FMT_DBLP;
228 if( s->int_sample_fmt != AV_SAMPLE_FMT_S16P
229 &&s->int_sample_fmt != AV_SAMPLE_FMT_S32P
230 &&s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
231 &&s->int_sample_fmt != AV_SAMPLE_FMT_DBLP){
232 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));
233 return AVERROR(EINVAL);
236 set_audiodata_fmt(&s-> in, s-> in_sample_fmt);
237 set_audiodata_fmt(&s->out, s->out_sample_fmt);
239 if (s->firstpts_in_samples != AV_NOPTS_VALUE) {
240 if (!s->async && s->min_compensation >= FLT_MAX/2)
243 s->outpts = s->firstpts_in_samples * s->out_sample_rate;
245 s->firstpts = AV_NOPTS_VALUE;
248 if (s->min_compensation >= FLT_MAX/2)
249 s->min_compensation = 0.001;
250 if (s->async > 1.0001) {
251 s->max_soft_compensation = s->async / (double) s->in_sample_rate;
255 if (s->out_sample_rate!=s->in_sample_rate || (s->flags & SWR_FLAG_RESAMPLE)){
256 s->resample = s->resampler->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, s->filter_type, s->kaiser_beta, s->precision, s->cheby);
258 av_log(s, AV_LOG_ERROR, "Failed to initialize resampler\n");
259 return AVERROR(ENOMEM);
262 s->resampler->free(&s->resample);
263 if( s->int_sample_fmt != AV_SAMPLE_FMT_S16P
264 && s->int_sample_fmt != AV_SAMPLE_FMT_S32P
265 && s->int_sample_fmt != AV_SAMPLE_FMT_FLTP
266 && s->int_sample_fmt != AV_SAMPLE_FMT_DBLP
268 av_log(s, AV_LOG_ERROR, "Resampling only supported with internal s16/s32/flt/dbl\n");
269 ret = AVERROR(EINVAL);
273 #define RSC 1 //FIXME finetune
275 s-> in.ch_count= av_get_channel_layout_nb_channels(s-> in_ch_layout);
276 if(!s->used_ch_count)
277 s->used_ch_count= s->in.ch_count;
279 s->out.ch_count= av_get_channel_layout_nb_channels(s->out_ch_layout);
281 if(!s-> in.ch_count){
282 av_assert0(!s->in_ch_layout);
283 av_log(s, AV_LOG_ERROR, "Input channel count and layout are unset\n");
284 ret = AVERROR(EINVAL);
288 av_get_channel_layout_string(l1, sizeof(l1), s-> in.ch_count, s-> in_ch_layout);
289 av_get_channel_layout_string(l2, sizeof(l2), s->out.ch_count, s->out_ch_layout);
290 if (s->out_ch_layout && s->out.ch_count != av_get_channel_layout_nb_channels(s->out_ch_layout)) {
291 av_log(s, AV_LOG_ERROR, "Output channel layout %s mismatches specified channel count %d\n", l2, s->out.ch_count);
292 ret = AVERROR(EINVAL);
295 if (s->in_ch_layout && s->used_ch_count != av_get_channel_layout_nb_channels(s->in_ch_layout)) {
296 av_log(s, AV_LOG_ERROR, "Input channel layout %s mismatches specified channel count %d\n", l1, s->used_ch_count);
297 ret = AVERROR(EINVAL);
301 if ((!s->out_ch_layout || !s->in_ch_layout) && s->used_ch_count != s->out.ch_count && !s->rematrix_custom) {
302 av_log(s, AV_LOG_ERROR, "Rematrix is needed between %s and %s "
303 "but there is not enough information to do it\n", l1, l2);
304 ret = AVERROR(EINVAL);
308 av_assert0(s->used_ch_count);
309 av_assert0(s->out.ch_count);
310 s->resample_first= RSC*s->out.ch_count/s->in.ch_count - RSC < s->out_sample_rate/(float)s-> in_sample_rate - 1.0;
314 s->drop_temp= s->out;
316 if(!s->resample && !s->rematrix && !s->channel_map && !s->dither.method){
317 s->full_convert = swri_audio_convert_alloc(s->out_sample_fmt,
318 s-> in_sample_fmt, s-> in.ch_count, NULL, 0);
322 s->in_convert = swri_audio_convert_alloc(s->int_sample_fmt,
323 s-> in_sample_fmt, s->used_ch_count, s->channel_map, 0);
324 s->out_convert= swri_audio_convert_alloc(s->out_sample_fmt,
325 s->int_sample_fmt, s->out.ch_count, NULL, 0);
327 if (!s->in_convert || !s->out_convert) {
328 ret = AVERROR(ENOMEM);
338 s->midbuf.ch_count= s->used_ch_count;
340 s->in_buffer.ch_count= s->used_ch_count;
342 if(!s->resample_first){
343 s->midbuf.ch_count= s->out.ch_count;
345 s->in_buffer.ch_count = s->out.ch_count;
348 set_audiodata_fmt(&s->postin, s->int_sample_fmt);
349 set_audiodata_fmt(&s->midbuf, s->int_sample_fmt);
350 set_audiodata_fmt(&s->preout, s->int_sample_fmt);
353 set_audiodata_fmt(&s->in_buffer, s->int_sample_fmt);
356 if ((ret = swri_dither_init(s, s->out_sample_fmt, s->int_sample_fmt)) < 0)
359 if(s->rematrix || s->dither.method) {
360 ret = swri_rematrix_init(s);
372 int swri_realloc_audio(AudioData *a, int count){
376 if(count < 0 || count > INT_MAX/2/a->bps/a->ch_count)
377 return AVERROR(EINVAL);
379 if(a->count >= count)
384 countb= FFALIGN(count*a->bps, ALIGN);
388 av_assert0(a->ch_count);
390 a->data= av_mallocz_array(countb, a->ch_count);
392 return AVERROR(ENOMEM);
393 for(i=0; i<a->ch_count; i++){
394 a->ch[i]= a->data + i*(a->planar ? countb : a->bps);
395 if(a->planar) memcpy(a->ch[i], old.ch[i], a->count*a->bps);
397 if(!a->planar) memcpy(a->ch[0], old.ch[0], a->count*a->ch_count*a->bps);
404 static void copy(AudioData *out, AudioData *in,
406 av_assert0(out->planar == in->planar);
407 av_assert0(out->bps == in->bps);
408 av_assert0(out->ch_count == in->ch_count);
411 for(ch=0; ch<out->ch_count; ch++)
412 memcpy(out->ch[ch], in->ch[ch], count*out->bps);
414 memcpy(out->ch[0], in->ch[0], count*out->ch_count*out->bps);
417 static void fill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
420 memset(out->ch, 0, sizeof(out->ch));
421 }else if(out->planar){
422 for(i=0; i<out->ch_count; i++)
423 out->ch[i]= in_arg[i];
425 for(i=0; i<out->ch_count; i++)
426 out->ch[i]= in_arg[0] + i*out->bps;
430 static void reversefill_audiodata(AudioData *out, uint8_t *in_arg [SWR_CH_MAX]){
433 for(i=0; i<out->ch_count; i++)
434 in_arg[i]= out->ch[i];
436 in_arg[0]= out->ch[0];
442 * out may be equal in.
444 static void buf_set(AudioData *out, AudioData *in, int count){
447 for(ch=0; ch<out->ch_count; ch++)
448 out->ch[ch]= in->ch[ch] + count*out->bps;
450 for(ch=out->ch_count-1; ch>=0; ch--)
451 out->ch[ch]= in->ch[0] + (ch + count*out->ch_count) * out->bps;
457 * @return number of samples output per channel
459 static int resample(SwrContext *s, AudioData *out_param, int out_count,
460 const AudioData * in_param, int in_count){
461 AudioData in, out, tmp;
464 int padless = ARCH_X86 && s->engine == SWR_ENGINE_SWR ? 7 : 0;
466 av_assert1(s->in_buffer.ch_count == in_param->ch_count);
467 av_assert1(s->in_buffer.planar == in_param->planar);
468 av_assert1(s->in_buffer.fmt == in_param->fmt);
473 border = s->resampler->invert_initial_buffer(s->resample, &s->in_buffer,
474 &in, in_count, &s->in_buffer_index, &s->in_buffer_count);
475 if (border == INT_MAX) {
477 } else if (border < 0) {
480 buf_set(&in, &in, border);
482 s->resample_in_constraint = 0;
486 int ret, size, consumed;
487 if(!s->resample_in_constraint && s->in_buffer_count){
488 buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
489 ret= s->resampler->multiple_resample(s->resample, &out, out_count, &tmp, s->in_buffer_count, &consumed);
492 buf_set(&out, &out, ret);
493 s->in_buffer_count -= consumed;
494 s->in_buffer_index += consumed;
498 if(s->in_buffer_count <= border){
499 buf_set(&in, &in, -s->in_buffer_count);
500 in_count += s->in_buffer_count;
501 s->in_buffer_count=0;
502 s->in_buffer_index=0;
507 if((s->flushed || in_count > padless) && !s->in_buffer_count){
508 s->in_buffer_index=0;
509 ret= s->resampler->multiple_resample(s->resample, &out, out_count, &in, FFMAX(in_count-padless, 0), &consumed);
512 buf_set(&out, &out, ret);
513 in_count -= consumed;
514 buf_set(&in, &in, consumed);
517 //TODO is this check sane considering the advanced copy avoidance below
518 size= s->in_buffer_index + s->in_buffer_count + in_count;
519 if( size > s->in_buffer.count
520 && s->in_buffer_count + in_count <= s->in_buffer_index){
521 buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
522 copy(&s->in_buffer, &tmp, s->in_buffer_count);
523 s->in_buffer_index=0;
525 if((ret=swri_realloc_audio(&s->in_buffer, size)) < 0)
530 if(s->in_buffer_count && s->in_buffer_count+2 < count && out_count) count= s->in_buffer_count+2;
532 buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
533 copy(&tmp, &in, /*in_*/count);
534 s->in_buffer_count += count;
537 buf_set(&in, &in, count);
538 s->resample_in_constraint= 0;
539 if(s->in_buffer_count != count || in_count)
549 s->resample_in_constraint= !!out_count;
554 static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_count,
555 AudioData *in , int in_count){
556 AudioData *postin, *midbuf, *preout;
558 AudioData preout_tmp, midbuf_tmp;
561 av_assert0(!s->resample);
562 swri_audio_convert(s->full_convert, out, in, in_count);
566 // in_max= out_count*(int64_t)s->in_sample_rate / s->out_sample_rate + resample_filter_taps;
567 // in_count= FFMIN(in_count, in_in + 2 - s->hist_buffer_count);
569 if((ret=swri_realloc_audio(&s->postin, in_count))<0)
571 if(s->resample_first){
572 av_assert0(s->midbuf.ch_count == s->used_ch_count);
573 if((ret=swri_realloc_audio(&s->midbuf, out_count))<0)
576 av_assert0(s->midbuf.ch_count == s->out.ch_count);
577 if((ret=swri_realloc_audio(&s->midbuf, in_count))<0)
580 if((ret=swri_realloc_audio(&s->preout, out_count))<0)
585 midbuf_tmp= s->midbuf;
587 preout_tmp= s->preout;
590 if(s->int_sample_fmt == s-> in_sample_fmt && s->in.planar && !s->channel_map)
593 if(s->resample_first ? !s->resample : !s->rematrix)
596 if(s->resample_first ? !s->rematrix : !s->resample)
599 if(s->int_sample_fmt == s->out_sample_fmt && s->out.planar
600 && !(s->out_sample_fmt==AV_SAMPLE_FMT_S32P && (s->dither.output_sample_bits&31))){
602 out_count= FFMIN(out_count, in_count); //TODO check at the end if this is needed or redundant
603 av_assert0(s->in.planar); //we only support planar internally so it has to be, we support copying non planar though
604 copy(out, in, out_count);
607 else if(preout==postin) preout= midbuf= postin= out;
608 else if(preout==midbuf) preout= midbuf= out;
613 swri_audio_convert(s->in_convert, postin, in, in_count);
616 if(s->resample_first){
618 out_count= resample(s, midbuf, out_count, postin, in_count);
620 swri_rematrix(s, preout, midbuf, out_count, preout==out);
623 swri_rematrix(s, midbuf, postin, in_count, midbuf==out);
625 out_count= resample(s, preout, out_count, midbuf, in_count);
628 if(preout != out && out_count){
629 AudioData *conv_src = preout;
630 if(s->dither.method){
632 int dither_count= FFMAX(out_count, 1<<16);
635 conv_src = &s->dither.temp;
636 if((ret=swri_realloc_audio(&s->dither.temp, dither_count))<0)
640 if((ret=swri_realloc_audio(&s->dither.noise, dither_count))<0)
643 for(ch=0; ch<s->dither.noise.ch_count; ch++)
644 if((ret=swri_get_dither(s, s->dither.noise.ch[ch], s->dither.noise.count, 12345678913579<<ch, s->dither.noise.fmt))<0)
646 av_assert0(s->dither.noise.ch_count == preout->ch_count);
648 if(s->dither.noise_pos + out_count > s->dither.noise.count)
649 s->dither.noise_pos = 0;
651 if (s->dither.method < SWR_DITHER_NS){
652 if (s->mix_2_1_simd) {
653 int len1= out_count&~15;
654 int off = len1 * preout->bps;
657 for(ch=0; ch<preout->ch_count; ch++)
658 s->mix_2_1_simd(conv_src->ch[ch], preout->ch[ch], s->dither.noise.ch[ch] + s->dither.noise.bps * s->dither.noise_pos, s->native_simd_one, 0, 0, len1);
659 if(out_count != len1)
660 for(ch=0; ch<preout->ch_count; ch++)
661 s->mix_2_1_f(conv_src->ch[ch] + off, preout->ch[ch] + off, s->dither.noise.ch[ch] + s->dither.noise.bps * s->dither.noise_pos + off + len1, s->native_one, 0, 0, out_count - len1);
663 for(ch=0; ch<preout->ch_count; ch++)
664 s->mix_2_1_f(conv_src->ch[ch], preout->ch[ch], s->dither.noise.ch[ch] + s->dither.noise.bps * s->dither.noise_pos, s->native_one, 0, 0, out_count);
667 switch(s->int_sample_fmt) {
668 case AV_SAMPLE_FMT_S16P :swri_noise_shaping_int16(s, conv_src, preout, &s->dither.noise, out_count); break;
669 case AV_SAMPLE_FMT_S32P :swri_noise_shaping_int32(s, conv_src, preout, &s->dither.noise, out_count); break;
670 case AV_SAMPLE_FMT_FLTP :swri_noise_shaping_float(s, conv_src, preout, &s->dither.noise, out_count); break;
671 case AV_SAMPLE_FMT_DBLP :swri_noise_shaping_double(s,conv_src, preout, &s->dither.noise, out_count); break;
674 s->dither.noise_pos += out_count;
676 //FIXME packed doesn't need more than 1 chan here!
677 swri_audio_convert(s->out_convert, out, conv_src, out_count);
682 int swr_is_initialized(struct SwrContext *s) {
683 return !!s->in_buffer.ch_count;
686 int attribute_align_arg swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
687 const uint8_t *in_arg [SWR_CH_MAX], int in_count){
688 AudioData * in= &s->in;
689 AudioData *out= &s->out;
690 int av_unused max_output;
692 if (!swr_is_initialized(s)) {
693 av_log(s, AV_LOG_ERROR, "Context has not been initialized\n");
694 return AVERROR(EINVAL);
696 #if defined(ASSERT_LEVEL) && ASSERT_LEVEL >1
697 max_output = swr_get_out_samples(s, in_count);
700 while(s->drop_output > 0){
702 uint8_t *tmp_arg[SWR_CH_MAX];
703 #define MAX_DROP_STEP 16384
704 if((ret=swri_realloc_audio(&s->drop_temp, FFMIN(s->drop_output, MAX_DROP_STEP)))<0)
707 reversefill_audiodata(&s->drop_temp, tmp_arg);
708 s->drop_output *= -1; //FIXME find a less hackish solution
709 ret = swr_convert(s, tmp_arg, FFMIN(-s->drop_output, MAX_DROP_STEP), in_arg, in_count); //FIXME optimize but this is as good as never called so maybe it doesn't matter
710 s->drop_output *= -1;
713 s->drop_output -= ret;
714 if (!s->drop_output && !out_arg)
719 av_assert0(s->drop_output);
726 s->resampler->flush(s);
727 s->resample_in_constraint = 0;
729 }else if(!s->in_buffer_count){
733 fill_audiodata(in , (void*)in_arg);
735 fill_audiodata(out, out_arg);
738 int ret = swr_convert_internal(s, out, out_count, in, in_count);
739 if(ret>0 && !s->drop_output)
740 s->outpts += ret * (int64_t)s->in_sample_rate;
742 av_assert2(max_output < 0 || ret < 0 || ret <= max_output);
749 size = FFMIN(out_count, s->in_buffer_count);
751 buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
752 ret= swr_convert_internal(s, out, size, &tmp, size);
756 s->in_buffer_count -= ret;
757 s->in_buffer_index += ret;
758 buf_set(out, out, ret);
760 if(!s->in_buffer_count)
761 s->in_buffer_index = 0;
765 size= s->in_buffer_index + s->in_buffer_count + in_count - out_count;
767 if(in_count > out_count) { //FIXME move after swr_convert_internal
768 if( size > s->in_buffer.count
769 && s->in_buffer_count + in_count - out_count <= s->in_buffer_index){
770 buf_set(&tmp, &s->in_buffer, s->in_buffer_index);
771 copy(&s->in_buffer, &tmp, s->in_buffer_count);
772 s->in_buffer_index=0;
774 if((ret=swri_realloc_audio(&s->in_buffer, size)) < 0)
779 size = FFMIN(in_count, out_count);
780 ret= swr_convert_internal(s, out, size, in, size);
783 buf_set(in, in, ret);
788 buf_set(&tmp, &s->in_buffer, s->in_buffer_index + s->in_buffer_count);
789 copy(&tmp, in, in_count);
790 s->in_buffer_count += in_count;
793 if(ret2>0 && !s->drop_output)
794 s->outpts += ret2 * (int64_t)s->in_sample_rate;
795 av_assert2(max_output < 0 || ret2 < 0 || ret2 <= max_output);
800 int swr_drop_output(struct SwrContext *s, int count){
801 const uint8_t *tmp_arg[SWR_CH_MAX];
802 s->drop_output += count;
804 if(s->drop_output <= 0)
807 av_log(s, AV_LOG_VERBOSE, "discarding %d audio samples\n", count);
808 return swr_convert(s, NULL, s->drop_output, tmp_arg, 0);
811 int swr_inject_silence(struct SwrContext *s, int count){
813 uint8_t *tmp_arg[SWR_CH_MAX];
818 #define MAX_SILENCE_STEP 16384
819 while (count > MAX_SILENCE_STEP) {
820 if ((ret = swr_inject_silence(s, MAX_SILENCE_STEP)) < 0)
822 count -= MAX_SILENCE_STEP;
825 if((ret=swri_realloc_audio(&s->silence, count))<0)
828 if(s->silence.planar) for(i=0; i<s->silence.ch_count; i++) {
829 memset(s->silence.ch[i], s->silence.bps==1 ? 0x80 : 0, count*s->silence.bps);
831 memset(s->silence.ch[0], s->silence.bps==1 ? 0x80 : 0, count*s->silence.bps*s->silence.ch_count);
833 reversefill_audiodata(&s->silence, tmp_arg);
834 av_log(s, AV_LOG_VERBOSE, "adding %d audio samples of silence\n", count);
835 ret = swr_convert(s, NULL, 0, (const uint8_t**)tmp_arg, count);
839 int64_t swr_get_delay(struct SwrContext *s, int64_t base){
840 if (s->resampler && s->resample){
841 return s->resampler->get_delay(s, base);
843 return (s->in_buffer_count*base + (s->in_sample_rate>>1))/ s->in_sample_rate;
847 int swr_get_out_samples(struct SwrContext *s, int in_samples)
852 return AVERROR(EINVAL);
854 if (s->resampler && s->resample) {
855 if (!s->resampler->get_out_samples)
856 return AVERROR(ENOSYS);
857 out_samples = s->resampler->get_out_samples(s, in_samples);
859 out_samples = s->in_buffer_count + in_samples;
860 av_assert0(s->out_sample_rate == s->in_sample_rate);
863 if (out_samples > INT_MAX)
864 return AVERROR(EINVAL);
869 int swr_set_compensation(struct SwrContext *s, int sample_delta, int compensation_distance){
872 if (!s || compensation_distance < 0)
873 return AVERROR(EINVAL);
874 if (!compensation_distance && sample_delta)
875 return AVERROR(EINVAL);
877 s->flags |= SWR_FLAG_RESAMPLE;
882 if (!s->resampler->set_compensation){
883 return AVERROR(EINVAL);
885 return s->resampler->set_compensation(s->resample, sample_delta, compensation_distance);
889 int64_t swr_next_pts(struct SwrContext *s, int64_t pts){
893 if (s->firstpts == AV_NOPTS_VALUE)
894 s->outpts = s->firstpts = pts;
896 if(s->min_compensation >= FLT_MAX) {
897 return (s->outpts = pts - swr_get_delay(s, s->in_sample_rate * (int64_t)s->out_sample_rate));
899 int64_t delta = pts - swr_get_delay(s, s->in_sample_rate * (int64_t)s->out_sample_rate) - s->outpts + s->drop_output*(int64_t)s->in_sample_rate;
900 double fdelta = delta /(double)(s->in_sample_rate * (int64_t)s->out_sample_rate);
902 if(fabs(fdelta) > s->min_compensation) {
903 if(s->outpts == s->firstpts || fabs(fdelta) > s->min_hard_compensation){
905 if(delta > 0) ret = swr_inject_silence(s, delta / s->out_sample_rate);
906 else ret = swr_drop_output (s, -delta / s-> in_sample_rate);
908 av_log(s, AV_LOG_ERROR, "Failed to compensate for timestamp delta of %f\n", fdelta);
910 } else if(s->soft_compensation_duration && s->max_soft_compensation) {
911 int duration = s->out_sample_rate * s->soft_compensation_duration;
912 double max_soft_compensation = s->max_soft_compensation / (s->max_soft_compensation < 0 ? -s->in_sample_rate : 1);
913 int comp = av_clipf(fdelta, -max_soft_compensation, max_soft_compensation) * duration ;
914 av_log(s, AV_LOG_VERBOSE, "compensating audio timestamp drift:%f compensation:%d in:%d\n", fdelta, comp, duration);
915 swr_set_compensation(s, comp, duration);