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