| 1 | /* |
| 2 | * audio resampling with soxr |
| 3 | * Copyright (c) 2012 Rob Sykes <robs@users.sourceforge.net> |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * audio resampling with soxr |
| 25 | */ |
| 26 | |
| 27 | #include "libavutil/log.h" |
| 28 | #include "swresample_internal.h" |
| 29 | |
| 30 | #include <soxr.h> |
| 31 | |
| 32 | static struct ResampleContext *create(struct ResampleContext *c, int out_rate, int in_rate, int filter_size, int phase_shift, int linear, |
| 33 | double cutoff, enum AVSampleFormat format, enum SwrFilterType filter_type, int kaiser_beta, double precision, int cheby){ |
| 34 | soxr_error_t error; |
| 35 | |
| 36 | soxr_datatype_t type = |
| 37 | format == AV_SAMPLE_FMT_S16P? SOXR_INT16_S : |
| 38 | format == AV_SAMPLE_FMT_S16 ? SOXR_INT16_I : |
| 39 | format == AV_SAMPLE_FMT_S32P? SOXR_INT32_S : |
| 40 | format == AV_SAMPLE_FMT_S32 ? SOXR_INT32_I : |
| 41 | format == AV_SAMPLE_FMT_FLTP? SOXR_FLOAT32_S : |
| 42 | format == AV_SAMPLE_FMT_FLT ? SOXR_FLOAT32_I : |
| 43 | format == AV_SAMPLE_FMT_DBLP? SOXR_FLOAT64_S : |
| 44 | format == AV_SAMPLE_FMT_DBL ? SOXR_FLOAT64_I : (soxr_datatype_t)-1; |
| 45 | |
| 46 | soxr_io_spec_t io_spec = soxr_io_spec(type, type); |
| 47 | |
| 48 | soxr_quality_spec_t q_spec = soxr_quality_spec((int)((precision-2)/4), (SOXR_HI_PREC_CLOCK|SOXR_ROLLOFF_NONE)*!!cheby); |
| 49 | q_spec.precision = linear? 0 : precision; |
| 50 | #if !defined SOXR_VERSION /* Deprecated @ March 2013: */ |
| 51 | q_spec.bw_pc = cutoff? FFMAX(FFMIN(cutoff,.995),.8)*100 : q_spec.bw_pc; |
| 52 | #else |
| 53 | q_spec.passband_end = cutoff? FFMAX(FFMIN(cutoff,.995),.8) : q_spec.passband_end; |
| 54 | #endif |
| 55 | |
| 56 | soxr_delete((soxr_t)c); |
| 57 | c = (struct ResampleContext *) |
| 58 | soxr_create(in_rate, out_rate, 0, &error, &io_spec, &q_spec, 0); |
| 59 | if (!c) |
| 60 | av_log(NULL, AV_LOG_ERROR, "soxr_create: %s\n", error); |
| 61 | return c; |
| 62 | } |
| 63 | |
| 64 | static void destroy(struct ResampleContext * *c){ |
| 65 | soxr_delete((soxr_t)*c); |
| 66 | *c = NULL; |
| 67 | } |
| 68 | |
| 69 | static int flush(struct SwrContext *s){ |
| 70 | soxr_process((soxr_t)s->resample, NULL, 0, NULL, NULL, 0, NULL); |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | static int process( |
| 75 | struct ResampleContext * c, AudioData *dst, int dst_size, |
| 76 | AudioData *src, int src_size, int *consumed){ |
| 77 | size_t idone, odone; |
| 78 | soxr_error_t error = soxr_set_error((soxr_t)c, soxr_set_num_channels((soxr_t)c, src->ch_count)); |
| 79 | error = soxr_process((soxr_t)c, src->ch, (size_t)src_size, |
| 80 | &idone, dst->ch, (size_t)dst_size, &odone); |
| 81 | *consumed = (int)idone; |
| 82 | return error? -1 : odone; |
| 83 | } |
| 84 | |
| 85 | static int64_t get_delay(struct SwrContext *s, int64_t base){ |
| 86 | double delay_s = soxr_delay((soxr_t)s->resample) / s->out_sample_rate; |
| 87 | return (int64_t)(delay_s * base + .5); |
| 88 | } |
| 89 | |
| 90 | static int invert_initial_buffer(struct ResampleContext *c, AudioData *dst, const AudioData *src, |
| 91 | int in_count, int *out_idx, int *out_sz) |
| 92 | { |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | struct Resampler const soxr_resampler={ |
| 97 | create, destroy, process, flush, NULL /* set_compensation */, get_delay, |
| 98 | invert_initial_buffer, |
| 99 | }; |
| 100 | |