yading@11: /*
yading@11:  * audio resampling with soxr
yading@11:  * Copyright (c) 2012 Rob Sykes <robs@users.sourceforge.net>
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * audio resampling with soxr
yading@11:  */
yading@11: 
yading@11: #include "libavutil/log.h"
yading@11: #include "swresample_internal.h"
yading@11: 
yading@11: #include <soxr.h>
yading@11: 
yading@11: static struct ResampleContext *create(struct ResampleContext *c, int out_rate, int in_rate, int filter_size, int phase_shift, int linear,
yading@11:         double cutoff, enum AVSampleFormat format, enum SwrFilterType filter_type, int kaiser_beta, double precision, int cheby){
yading@11:     soxr_error_t error;
yading@11: 
yading@11:     soxr_datatype_t type =
yading@11:         format == AV_SAMPLE_FMT_S16P? SOXR_INT16_S :
yading@11:         format == AV_SAMPLE_FMT_S16 ? SOXR_INT16_I :
yading@11:         format == AV_SAMPLE_FMT_S32P? SOXR_INT32_S :
yading@11:         format == AV_SAMPLE_FMT_S32 ? SOXR_INT32_I :
yading@11:         format == AV_SAMPLE_FMT_FLTP? SOXR_FLOAT32_S :
yading@11:         format == AV_SAMPLE_FMT_FLT ? SOXR_FLOAT32_I :
yading@11:         format == AV_SAMPLE_FMT_DBLP? SOXR_FLOAT64_S :
yading@11:         format == AV_SAMPLE_FMT_DBL ? SOXR_FLOAT64_I : (soxr_datatype_t)-1;
yading@11: 
yading@11:     soxr_io_spec_t io_spec = soxr_io_spec(type, type);
yading@11: 
yading@11:     soxr_quality_spec_t q_spec = soxr_quality_spec((int)((precision-2)/4), (SOXR_HI_PREC_CLOCK|SOXR_ROLLOFF_NONE)*!!cheby);
yading@11:     q_spec.precision = linear? 0 : precision;
yading@11: #if !defined SOXR_VERSION /* Deprecated @ March 2013: */
yading@11:     q_spec.bw_pc = cutoff? FFMAX(FFMIN(cutoff,.995),.8)*100 : q_spec.bw_pc;
yading@11: #else
yading@11:     q_spec.passband_end = cutoff? FFMAX(FFMIN(cutoff,.995),.8) : q_spec.passband_end;
yading@11: #endif
yading@11: 
yading@11:     soxr_delete((soxr_t)c);
yading@11:     c = (struct ResampleContext *)
yading@11:         soxr_create(in_rate, out_rate, 0, &error, &io_spec, &q_spec, 0);
yading@11:     if (!c)
yading@11:         av_log(NULL, AV_LOG_ERROR, "soxr_create: %s\n", error);
yading@11:     return c;
yading@11: }
yading@11: 
yading@11: static void destroy(struct ResampleContext * *c){
yading@11:     soxr_delete((soxr_t)*c);
yading@11:     *c = NULL;
yading@11: }
yading@11: 
yading@11: static int flush(struct SwrContext *s){
yading@11:     soxr_process((soxr_t)s->resample, NULL, 0, NULL, NULL, 0, NULL);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int process(
yading@11:         struct ResampleContext * c, AudioData *dst, int dst_size,
yading@11:         AudioData *src, int src_size, int *consumed){
yading@11:     size_t idone, odone;
yading@11:     soxr_error_t error = soxr_set_error((soxr_t)c, soxr_set_num_channels((soxr_t)c, src->ch_count));
yading@11:     error = soxr_process((soxr_t)c, src->ch, (size_t)src_size,
yading@11:             &idone, dst->ch, (size_t)dst_size, &odone);
yading@11:     *consumed = (int)idone;
yading@11:     return error? -1 : odone;
yading@11: }
yading@11: 
yading@11: static int64_t get_delay(struct SwrContext *s, int64_t base){
yading@11:     double delay_s = soxr_delay((soxr_t)s->resample) / s->out_sample_rate;
yading@11:     return (int64_t)(delay_s * base + .5);
yading@11: }
yading@11: 
yading@11: struct Resampler const soxr_resampler={
yading@11:     create, destroy, process, flush, NULL /* set_compensation */, get_delay,
yading@11: };
yading@11: