| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen, Vladimir Sadovnikov and others | ||
| 3 | * Copyright (c) 2015 Paul B Mahol | ||
| 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 | #include "libavutil/opt.h" | ||
| 23 | #include "libavutil/samplefmt.h" | ||
| 24 | #include "avfilter.h" | ||
| 25 | #include "audio.h" | ||
| 26 | #include "filters.h" | ||
| 27 | |||
| 28 | typedef struct CompensationDelayContext { | ||
| 29 | const AVClass *class; | ||
| 30 | int distance_mm; | ||
| 31 | int distance_cm; | ||
| 32 | int distance_m; | ||
| 33 | double dry, wet; | ||
| 34 | int temp; | ||
| 35 | |||
| 36 | unsigned delay; | ||
| 37 | unsigned w_ptr; | ||
| 38 | unsigned buf_size; | ||
| 39 | AVFrame *delay_frame; | ||
| 40 | } CompensationDelayContext; | ||
| 41 | |||
| 42 | #define OFFSET(x) offsetof(CompensationDelayContext, x) | ||
| 43 | #define A (AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM) | ||
| 44 | |||
| 45 | static const AVOption compensationdelay_options[] = { | ||
| 46 | { "mm", "set mm distance", OFFSET(distance_mm), AV_OPT_TYPE_INT, {.i64=0}, 0, 10, A }, | ||
| 47 | { "cm", "set cm distance", OFFSET(distance_cm), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, A }, | ||
| 48 | { "m", "set meter distance", OFFSET(distance_m), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, A }, | ||
| 49 | { "dry", "set dry amount", OFFSET(dry), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, A }, | ||
| 50 | { "wet", "set wet amount", OFFSET(wet), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, A }, | ||
| 51 | { "temp", "set temperature °C", OFFSET(temp), AV_OPT_TYPE_INT, {.i64=20}, -50, 50, A }, | ||
| 52 | { NULL } | ||
| 53 | }; | ||
| 54 | |||
| 55 | AVFILTER_DEFINE_CLASS(compensationdelay); | ||
| 56 | |||
| 57 | // The maximum distance for options | ||
| 58 | #define COMP_DELAY_MAX_DISTANCE (100.0 * 100.0 + 100.0 * 1.0 + 1.0) | ||
| 59 | // The actual speed of sound in normal conditions | ||
| 60 | #define COMP_DELAY_SOUND_SPEED_KM_H(temp) 1.85325 * (643.95 * sqrt(((temp + 273.15) / 273.15))) | ||
| 61 | #define COMP_DELAY_SOUND_SPEED_CM_S(temp) (COMP_DELAY_SOUND_SPEED_KM_H(temp) * (1000.0 * 100.0) /* cm/km */ / (60.0 * 60.0) /* s/h */) | ||
| 62 | #define COMP_DELAY_SOUND_FRONT_DELAY(temp) (1.0 / COMP_DELAY_SOUND_SPEED_CM_S(temp)) | ||
| 63 | // The maximum delay may be reached by this filter | ||
| 64 | #define COMP_DELAY_MAX_DELAY (COMP_DELAY_MAX_DISTANCE * COMP_DELAY_SOUND_FRONT_DELAY(50)) | ||
| 65 | |||
| 66 | ✗ | static int config_input(AVFilterLink *inlink) | |
| 67 | { | ||
| 68 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 69 | ✗ | CompensationDelayContext *s = ctx->priv; | |
| 70 | ✗ | unsigned min_size, new_size = 1; | |
| 71 | |||
| 72 | ✗ | s->delay = (s->distance_m * 100. + s->distance_cm * 1. + s->distance_mm * .1) * | |
| 73 | ✗ | COMP_DELAY_SOUND_FRONT_DELAY(s->temp) * inlink->sample_rate; | |
| 74 | ✗ | min_size = inlink->sample_rate * COMP_DELAY_MAX_DELAY; | |
| 75 | |||
| 76 | ✗ | while (new_size < min_size) | |
| 77 | ✗ | new_size <<= 1; | |
| 78 | |||
| 79 | ✗ | s->buf_size = new_size; | |
| 80 | ✗ | s->delay_frame = ff_get_audio_buffer(inlink, s->buf_size); | |
| 81 | ✗ | if (!s->delay_frame) | |
| 82 | ✗ | return AVERROR(ENOMEM); | |
| 83 | |||
| 84 | ✗ | return 0; | |
| 85 | } | ||
| 86 | |||
| 87 | ✗ | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
| 88 | { | ||
| 89 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 90 | ✗ | AVFilterLink *outlink = ctx->outputs[0]; | |
| 91 | ✗ | CompensationDelayContext *s = ctx->priv; | |
| 92 | ✗ | const unsigned b_mask = s->buf_size - 1; | |
| 93 | ✗ | const unsigned buf_size = s->buf_size; | |
| 94 | ✗ | const unsigned delay = s->delay; | |
| 95 | ✗ | const double dry = s->dry; | |
| 96 | ✗ | const double wet = s->wet; | |
| 97 | ✗ | unsigned r_ptr, w_ptr = 0; | |
| 98 | AVFrame *out; | ||
| 99 | int n, ch; | ||
| 100 | |||
| 101 | ✗ | out = ff_get_audio_buffer(outlink, in->nb_samples); | |
| 102 | ✗ | if (!out) { | |
| 103 | ✗ | av_frame_free(&in); | |
| 104 | ✗ | return AVERROR(ENOMEM); | |
| 105 | } | ||
| 106 | ✗ | av_frame_copy_props(out, in); | |
| 107 | |||
| 108 | ✗ | for (ch = 0; ch < inlink->ch_layout.nb_channels; ch++) { | |
| 109 | ✗ | const double *src = (const double *)in->extended_data[ch]; | |
| 110 | ✗ | double *dst = (double *)out->extended_data[ch]; | |
| 111 | ✗ | double *buffer = (double *)s->delay_frame->extended_data[ch]; | |
| 112 | |||
| 113 | ✗ | w_ptr = s->w_ptr; | |
| 114 | ✗ | r_ptr = (w_ptr + buf_size - delay) & b_mask; | |
| 115 | |||
| 116 | ✗ | for (n = 0; n < in->nb_samples; n++) { | |
| 117 | ✗ | const double sample = src[n]; | |
| 118 | |||
| 119 | ✗ | buffer[w_ptr] = sample; | |
| 120 | ✗ | dst[n] = dry * sample + wet * buffer[r_ptr]; | |
| 121 | ✗ | w_ptr = (w_ptr + 1) & b_mask; | |
| 122 | ✗ | r_ptr = (r_ptr + 1) & b_mask; | |
| 123 | } | ||
| 124 | } | ||
| 125 | ✗ | s->w_ptr = w_ptr; | |
| 126 | |||
| 127 | ✗ | if (ctx->is_disabled) { | |
| 128 | ✗ | av_frame_free(&out); | |
| 129 | ✗ | return ff_filter_frame(outlink, in); | |
| 130 | } | ||
| 131 | |||
| 132 | ✗ | av_frame_free(&in); | |
| 133 | ✗ | return ff_filter_frame(outlink, out); | |
| 134 | } | ||
| 135 | |||
| 136 | ✗ | static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, | |
| 137 | char *res, int res_len, int flags) | ||
| 138 | { | ||
| 139 | ✗ | CompensationDelayContext *s = ctx->priv; | |
| 140 | ✗ | AVFilterLink *outlink = ctx->outputs[0]; | |
| 141 | int ret; | ||
| 142 | |||
| 143 | ✗ | ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags); | |
| 144 | ✗ | if (ret < 0) | |
| 145 | ✗ | return ret; | |
| 146 | |||
| 147 | ✗ | s->delay = (s->distance_m * 100. + s->distance_cm * 1. + s->distance_mm * .1) * | |
| 148 | ✗ | COMP_DELAY_SOUND_FRONT_DELAY(s->temp) * outlink->sample_rate; | |
| 149 | |||
| 150 | ✗ | return 0; | |
| 151 | } | ||
| 152 | |||
| 153 | ✗ | static av_cold void uninit(AVFilterContext *ctx) | |
| 154 | { | ||
| 155 | ✗ | CompensationDelayContext *s = ctx->priv; | |
| 156 | |||
| 157 | ✗ | av_frame_free(&s->delay_frame); | |
| 158 | ✗ | } | |
| 159 | |||
| 160 | static const AVFilterPad compensationdelay_inputs[] = { | ||
| 161 | { | ||
| 162 | .name = "default", | ||
| 163 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 164 | .config_props = config_input, | ||
| 165 | .filter_frame = filter_frame, | ||
| 166 | }, | ||
| 167 | }; | ||
| 168 | |||
| 169 | const AVFilter ff_af_compensationdelay = { | ||
| 170 | .name = "compensationdelay", | ||
| 171 | .description = NULL_IF_CONFIG_SMALL("Audio Compensation Delay Line."), | ||
| 172 | .priv_size = sizeof(CompensationDelayContext), | ||
| 173 | .priv_class = &compensationdelay_class, | ||
| 174 | .uninit = uninit, | ||
| 175 | FILTER_INPUTS(compensationdelay_inputs), | ||
| 176 | FILTER_OUTPUTS(ff_audio_default_filterpad), | ||
| 177 | FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP), | ||
| 178 | .process_command = process_command, | ||
| 179 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, | ||
| 180 | }; | ||
| 181 |