| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) Markus Schmidt and Christian Holschuh | ||
| 3 | * | ||
| 4 | * This file is part of FFmpeg. | ||
| 5 | * | ||
| 6 | * FFmpeg 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. | ||
| 10 | * | ||
| 11 | * FFmpeg 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. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU Lesser General Public | ||
| 17 | * License along with FFmpeg; if not, write to the Free Software | ||
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | #include "libavutil/mem.h" | ||
| 22 | #include "libavutil/opt.h" | ||
| 23 | #include "avfilter.h" | ||
| 24 | #include "filters.h" | ||
| 25 | #include "audio.h" | ||
| 26 | |||
| 27 | typedef struct ChannelParams { | ||
| 28 | double blend_old, drive_old; | ||
| 29 | double rdrive, rbdr, kpa, kpb, kna, knb, ap, | ||
| 30 | an, imr, kc, srct, sq, pwrq; | ||
| 31 | double prev_med, prev_out; | ||
| 32 | |||
| 33 | double hp[5], lp[5]; | ||
| 34 | double hw[4][2], lw[2][2]; | ||
| 35 | } ChannelParams; | ||
| 36 | |||
| 37 | typedef struct AExciterContext { | ||
| 38 | const AVClass *class; | ||
| 39 | |||
| 40 | double level_in; | ||
| 41 | double level_out; | ||
| 42 | double amount; | ||
| 43 | double drive; | ||
| 44 | double blend; | ||
| 45 | double freq; | ||
| 46 | double ceil; | ||
| 47 | int listen; | ||
| 48 | |||
| 49 | ChannelParams *cp; | ||
| 50 | } AExciterContext; | ||
| 51 | |||
| 52 | #define OFFSET(x) offsetof(AExciterContext, x) | ||
| 53 | #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM | ||
| 54 | |||
| 55 | static const AVOption aexciter_options[] = { | ||
| 56 | { "level_in", "set level in", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 64, A }, | ||
| 57 | { "level_out", "set level out", OFFSET(level_out), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 64, A }, | ||
| 58 | { "amount", "set amount", OFFSET(amount), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 64, A }, | ||
| 59 | { "drive", "set harmonics", OFFSET(drive), AV_OPT_TYPE_DOUBLE, {.dbl=8.5}, 0.1, 10, A }, | ||
| 60 | { "blend", "set blend harmonics", OFFSET(blend), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -10, 10, A }, | ||
| 61 | { "freq", "set scope", OFFSET(freq), AV_OPT_TYPE_DOUBLE, {.dbl=7500}, 2000, 12000, A }, | ||
| 62 | { "ceil", "set ceiling", OFFSET(ceil), AV_OPT_TYPE_DOUBLE, {.dbl=9999}, 9999, 20000, A }, | ||
| 63 | { "listen", "enable listen mode", OFFSET(listen), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A }, | ||
| 64 | { NULL } | ||
| 65 | }; | ||
| 66 | |||
| 67 | AVFILTER_DEFINE_CLASS(aexciter); | ||
| 68 | |||
| 69 | ✗ | static inline double M(double x) | |
| 70 | { | ||
| 71 | ✗ | return (fabs(x) > 0.00000001) ? x : 0.0; | |
| 72 | } | ||
| 73 | |||
| 74 | ✗ | static inline double D(double x) | |
| 75 | { | ||
| 76 | ✗ | x = fabs(x); | |
| 77 | |||
| 78 | ✗ | return (x > 0.00000001) ? sqrt(x) : 0.0; | |
| 79 | } | ||
| 80 | |||
| 81 | ✗ | static void set_params(ChannelParams *p, | |
| 82 | double blend, double drive, | ||
| 83 | double srate, double freq, | ||
| 84 | double ceil) | ||
| 85 | { | ||
| 86 | double a0, a1, a2, b0, b1, b2, w0, alpha; | ||
| 87 | |||
| 88 | ✗ | p->rdrive = 12.0 / drive; | |
| 89 | ✗ | p->rbdr = p->rdrive / (10.5 - blend) * 780.0 / 33.0; | |
| 90 | ✗ | p->kpa = D(2.0 * (p->rdrive*p->rdrive) - 1.0) + 1.0; | |
| 91 | ✗ | p->kpb = (2.0 - p->kpa) / 2.0; | |
| 92 | ✗ | p->ap = ((p->rdrive*p->rdrive) - p->kpa + 1.0) / 2.0; | |
| 93 | ✗ | p->kc = p->kpa / D(2.0 * D(2.0 * (p->rdrive*p->rdrive) - 1.0) - 2.0 * p->rdrive*p->rdrive); | |
| 94 | |||
| 95 | ✗ | p->srct = (0.1 * srate) / (0.1 * srate + 1.0); | |
| 96 | ✗ | p->sq = p->kc*p->kc + 1.0; | |
| 97 | ✗ | p->knb = -1.0 * p->rbdr / D(p->sq); | |
| 98 | ✗ | p->kna = 2.0 * p->kc * p->rbdr / D(p->sq); | |
| 99 | ✗ | p->an = p->rbdr*p->rbdr / p->sq; | |
| 100 | ✗ | p->imr = 2.0 * p->knb + D(2.0 * p->kna + 4.0 * p->an - 1.0); | |
| 101 | ✗ | p->pwrq = 2.0 / (p->imr + 1.0); | |
| 102 | |||
| 103 | ✗ | w0 = 2 * M_PI * freq / srate; | |
| 104 | ✗ | alpha = sin(w0) / (2. * 0.707); | |
| 105 | ✗ | a0 = 1 + alpha; | |
| 106 | ✗ | a1 = -2 * cos(w0); | |
| 107 | ✗ | a2 = 1 - alpha; | |
| 108 | ✗ | b0 = (1 + cos(w0)) / 2; | |
| 109 | ✗ | b1 = -(1 + cos(w0)); | |
| 110 | ✗ | b2 = (1 + cos(w0)) / 2; | |
| 111 | |||
| 112 | ✗ | p->hp[0] =-a1 / a0; | |
| 113 | ✗ | p->hp[1] =-a2 / a0; | |
| 114 | ✗ | p->hp[2] = b0 / a0; | |
| 115 | ✗ | p->hp[3] = b1 / a0; | |
| 116 | ✗ | p->hp[4] = b2 / a0; | |
| 117 | |||
| 118 | ✗ | w0 = 2 * M_PI * ceil / srate; | |
| 119 | ✗ | alpha = sin(w0) / (2. * 0.707); | |
| 120 | ✗ | a0 = 1 + alpha; | |
| 121 | ✗ | a1 = -2 * cos(w0); | |
| 122 | ✗ | a2 = 1 - alpha; | |
| 123 | ✗ | b0 = (1 - cos(w0)) / 2; | |
| 124 | ✗ | b1 = 1 - cos(w0); | |
| 125 | ✗ | b2 = (1 - cos(w0)) / 2; | |
| 126 | |||
| 127 | ✗ | p->lp[0] =-a1 / a0; | |
| 128 | ✗ | p->lp[1] =-a2 / a0; | |
| 129 | ✗ | p->lp[2] = b0 / a0; | |
| 130 | ✗ | p->lp[3] = b1 / a0; | |
| 131 | ✗ | p->lp[4] = b2 / a0; | |
| 132 | ✗ | } | |
| 133 | |||
| 134 | ✗ | static double bprocess(double in, const double *const c, | |
| 135 | double *w1, double *w2) | ||
| 136 | { | ||
| 137 | ✗ | double out = c[2] * in + *w1; | |
| 138 | |||
| 139 | ✗ | *w1 = c[3] * in + *w2 + c[0] * out; | |
| 140 | ✗ | *w2 = c[4] * in + c[1] * out; | |
| 141 | |||
| 142 | ✗ | return out; | |
| 143 | } | ||
| 144 | |||
| 145 | ✗ | static double distortion_process(AExciterContext *s, ChannelParams *p, double in) | |
| 146 | { | ||
| 147 | ✗ | double proc = in, med; | |
| 148 | |||
| 149 | ✗ | proc = bprocess(proc, p->hp, &p->hw[0][0], &p->hw[0][1]); | |
| 150 | ✗ | proc = bprocess(proc, p->hp, &p->hw[1][0], &p->hw[1][1]); | |
| 151 | |||
| 152 | ✗ | if (proc >= 0.0) { | |
| 153 | ✗ | med = (D(p->ap + proc * (p->kpa - proc)) + p->kpb) * p->pwrq; | |
| 154 | } else { | ||
| 155 | ✗ | med = (D(p->an - proc * (p->kna + proc)) + p->knb) * p->pwrq * -1.0; | |
| 156 | } | ||
| 157 | |||
| 158 | ✗ | proc = p->srct * (med - p->prev_med + p->prev_out); | |
| 159 | ✗ | p->prev_med = M(med); | |
| 160 | ✗ | p->prev_out = M(proc); | |
| 161 | |||
| 162 | ✗ | proc = bprocess(proc, p->hp, &p->hw[2][0], &p->hw[2][1]); | |
| 163 | ✗ | proc = bprocess(proc, p->hp, &p->hw[3][0], &p->hw[3][1]); | |
| 164 | |||
| 165 | ✗ | if (s->ceil >= 10000.) { | |
| 166 | ✗ | proc = bprocess(proc, p->lp, &p->lw[0][0], &p->lw[0][1]); | |
| 167 | ✗ | proc = bprocess(proc, p->lp, &p->lw[1][0], &p->lw[1][1]); | |
| 168 | } | ||
| 169 | |||
| 170 | ✗ | return proc; | |
| 171 | } | ||
| 172 | |||
| 173 | ✗ | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
| 174 | { | ||
| 175 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 176 | ✗ | AExciterContext *s = ctx->priv; | |
| 177 | ✗ | AVFilterLink *outlink = ctx->outputs[0]; | |
| 178 | AVFrame *out; | ||
| 179 | ✗ | const double *src = (const double *)in->data[0]; | |
| 180 | ✗ | const double level_in = s->level_in; | |
| 181 | ✗ | const double level_out = s->level_out; | |
| 182 | ✗ | const double amount = s->amount; | |
| 183 | ✗ | const double listen = 1.0 - s->listen; | |
| 184 | double *dst; | ||
| 185 | |||
| 186 | ✗ | if (av_frame_is_writable(in)) { | |
| 187 | ✗ | out = in; | |
| 188 | } else { | ||
| 189 | ✗ | out = ff_get_audio_buffer(inlink, in->nb_samples); | |
| 190 | ✗ | if (!out) { | |
| 191 | ✗ | av_frame_free(&in); | |
| 192 | ✗ | return AVERROR(ENOMEM); | |
| 193 | } | ||
| 194 | ✗ | av_frame_copy_props(out, in); | |
| 195 | } | ||
| 196 | |||
| 197 | ✗ | dst = (double *)out->data[0]; | |
| 198 | ✗ | for (int n = 0; n < in->nb_samples; n++) { | |
| 199 | ✗ | for (int c = 0; c < inlink->ch_layout.nb_channels; c++) { | |
| 200 | ✗ | double sample = src[c] * level_in; | |
| 201 | |||
| 202 | ✗ | sample = distortion_process(s, &s->cp[c], sample); | |
| 203 | ✗ | sample = sample * amount + listen * src[c]; | |
| 204 | |||
| 205 | ✗ | sample *= level_out; | |
| 206 | ✗ | if (ctx->is_disabled) | |
| 207 | ✗ | dst[c] = src[c]; | |
| 208 | else | ||
| 209 | ✗ | dst[c] = sample; | |
| 210 | } | ||
| 211 | |||
| 212 | ✗ | src += inlink->ch_layout.nb_channels; | |
| 213 | ✗ | dst += inlink->ch_layout.nb_channels; | |
| 214 | } | ||
| 215 | |||
| 216 | ✗ | if (in != out) | |
| 217 | ✗ | av_frame_free(&in); | |
| 218 | |||
| 219 | ✗ | return ff_filter_frame(outlink, out); | |
| 220 | } | ||
| 221 | |||
| 222 | ✗ | static av_cold void uninit(AVFilterContext *ctx) | |
| 223 | { | ||
| 224 | ✗ | AExciterContext *s = ctx->priv; | |
| 225 | |||
| 226 | ✗ | av_freep(&s->cp); | |
| 227 | ✗ | } | |
| 228 | |||
| 229 | ✗ | static int config_input(AVFilterLink *inlink) | |
| 230 | { | ||
| 231 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 232 | ✗ | AExciterContext *s = ctx->priv; | |
| 233 | |||
| 234 | ✗ | if (!s->cp) | |
| 235 | ✗ | s->cp = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->cp)); | |
| 236 | ✗ | if (!s->cp) | |
| 237 | ✗ | return AVERROR(ENOMEM); | |
| 238 | |||
| 239 | ✗ | for (int i = 0; i < inlink->ch_layout.nb_channels; i++) | |
| 240 | ✗ | set_params(&s->cp[i], s->blend, s->drive, inlink->sample_rate, | |
| 241 | s->freq, s->ceil); | ||
| 242 | |||
| 243 | ✗ | return 0; | |
| 244 | } | ||
| 245 | |||
| 246 | ✗ | static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, | |
| 247 | char *res, int res_len, int flags) | ||
| 248 | { | ||
| 249 | ✗ | AVFilterLink *inlink = ctx->inputs[0]; | |
| 250 | int ret; | ||
| 251 | |||
| 252 | ✗ | ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags); | |
| 253 | ✗ | if (ret < 0) | |
| 254 | ✗ | return ret; | |
| 255 | |||
| 256 | ✗ | return config_input(inlink); | |
| 257 | } | ||
| 258 | |||
| 259 | static const AVFilterPad avfilter_af_aexciter_inputs[] = { | ||
| 260 | { | ||
| 261 | .name = "default", | ||
| 262 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 263 | .config_props = config_input, | ||
| 264 | .filter_frame = filter_frame, | ||
| 265 | }, | ||
| 266 | }; | ||
| 267 | |||
| 268 | const AVFilter ff_af_aexciter = { | ||
| 269 | .name = "aexciter", | ||
| 270 | .description = NULL_IF_CONFIG_SMALL("Enhance high frequency part of audio."), | ||
| 271 | .priv_size = sizeof(AExciterContext), | ||
| 272 | .priv_class = &aexciter_class, | ||
| 273 | .uninit = uninit, | ||
| 274 | FILTER_INPUTS(avfilter_af_aexciter_inputs), | ||
| 275 | FILTER_OUTPUTS(ff_audio_default_filterpad), | ||
| 276 | FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBL), | ||
| 277 | .process_command = process_command, | ||
| 278 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, | ||
| 279 | }; | ||
| 280 |