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| 1 | +/* |
| 2 | + * Copyright (c) 2022 Paul B Mahol |
| 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 License |
| 8 | + * 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 |
| 14 | + * GNU Lesser General Public License for more details. |
| 15 | + * |
| 16 | + * You should have received a copy of the GNU Lesser General Public License |
| 17 | + * along with FFmpeg; if not, write to the Free Software Foundation, Inc., |
| 18 | + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | + */ |
| 20 | + |
| 21 | +#include "libavutil/channel_layout.h" |
| 22 | +#include "libavutil/opt.h" |
| 23 | +#include "libavutil/tx.h" |
| 24 | +#include "audio.h" |
| 25 | +#include "avfilter.h" |
| 26 | +#include "filters.h" |
| 27 | +#include "internal.h" |
| 28 | +#include "window_func.h" |
| 29 | + |
| 30 | +#include <float.h> |
| 31 | + |
| 32 | +typedef struct AudioDialogueEnhancementContext { |
| 33 | + const AVClass *class; |
| 34 | + |
| 35 | + double original, enhance, voice; |
| 36 | + |
| 37 | + int fft_size; |
| 38 | + int overlap; |
| 39 | + |
| 40 | + float *window; |
| 41 | + float prev_vad; |
| 42 | + |
| 43 | + AVFrame *in; |
| 44 | + AVFrame *in_frame; |
| 45 | + AVFrame *out_dist_frame; |
| 46 | + AVFrame *windowed_frame; |
| 47 | + AVFrame *windowed_out; |
| 48 | + AVFrame *windowed_prev; |
| 49 | + AVFrame *center_frame; |
| 50 | + |
| 51 | + AVTXContext *tx_ctx[2], *itx_ctx; |
| 52 | + av_tx_fn tx_fn, itx_fn; |
| 53 | +} AudioDialogueEnhanceContext; |
| 54 | + |
| 55 | +#define OFFSET(x) offsetof(AudioDialogueEnhanceContext, x) |
| 56 | +#define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM |
| 57 | + |
| 58 | +static const AVOption dialoguenhance_options[] = { |
| 59 | + { "original", "set original center factor", OFFSET(original), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS }, |
| 60 | + { "enhance", "set dialogue enhance factor",OFFSET(enhance), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 3, FLAGS }, |
| 61 | + { "voice", "set voice detection factor", OFFSET(voice), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 2,32, FLAGS }, |
| 62 | + {NULL} |
| 63 | +}; |
| 64 | + |
| 65 | +AVFILTER_DEFINE_CLASS(dialoguenhance); |
| 66 | + |
| 67 | +static int query_formats(AVFilterContext *ctx) |
| 68 | +{ |
| 69 | + AVFilterFormats *formats = NULL; |
| 70 | + AVFilterChannelLayouts *in_layout = NULL, *out_layout = NULL; |
| 71 | + int ret; |
| 72 | + |
| 73 | + if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_FLTP )) < 0 || |
| 74 | + (ret = ff_set_common_formats (ctx , formats )) < 0 || |
| 75 | + (ret = ff_add_channel_layout (&in_layout , AV_CH_LAYOUT_STEREO)) < 0 || |
| 76 | + (ret = ff_channel_layouts_ref(in_layout, &ctx->inputs[0]->outcfg.channel_layouts)) < 0 || |
| 77 | + (ret = ff_add_channel_layout (&out_layout , AV_CH_LAYOUT_SURROUND)) < 0 || |
| 78 | + (ret = ff_channel_layouts_ref(out_layout, &ctx->outputs[0]->incfg.channel_layouts)) < 0) |
| 79 | + return ret; |
| 80 | + |
| 81 | + return ff_set_common_all_samplerates(ctx); |
| 82 | +} |
| 83 | + |
| 84 | +static int config_input(AVFilterLink *inlink) |
| 85 | +{ |
| 86 | + AVFilterContext *ctx = inlink->dst; |
| 87 | + AudioDialogueEnhanceContext *s = ctx->priv; |
| 88 | + float scale = 1.f, iscale, overlap; |
| 89 | + int ret; |
| 90 | + |
| 91 | + s->fft_size = inlink->sample_rate > 100000 ? 8192 : inlink->sample_rate > 50000 ? 4096 : 2048; |
| 92 | + s->overlap = s->fft_size / 4; |
| 93 | + |
| 94 | + s->window = av_calloc(s->fft_size, sizeof(*s->window)); |
| 95 | + if (!s->window) |
| 96 | + return AVERROR(ENOMEM); |
| 97 | + |
| 98 | + s->in_frame = ff_get_audio_buffer(inlink, s->fft_size * 4); |
| 99 | + s->center_frame = ff_get_audio_buffer(inlink, s->fft_size * 4); |
| 100 | + s->out_dist_frame = ff_get_audio_buffer(inlink, s->fft_size * 4); |
| 101 | + s->windowed_frame = ff_get_audio_buffer(inlink, s->fft_size * 4); |
| 102 | + s->windowed_out = ff_get_audio_buffer(inlink, s->fft_size * 4); |
| 103 | + s->windowed_prev = ff_get_audio_buffer(inlink, s->fft_size * 4); |
| 104 | + if (!s->in_frame || !s->windowed_out || !s->windowed_prev || |
| 105 | + !s->out_dist_frame || !s->windowed_frame || !s->center_frame) |
| 106 | + return AVERROR(ENOMEM); |
| 107 | + |
| 108 | + generate_window_func(s->window, s->fft_size, WFUNC_SINE, &overlap); |
| 109 | + |
| 110 | + iscale = 1.f / s->fft_size; |
| 111 | + |
| 112 | + ret = av_tx_init(&s->tx_ctx[0], &s->tx_fn, AV_TX_FLOAT_RDFT, 0, s->fft_size, &scale, 0); |
| 113 | + if (ret < 0) |
| 114 | + return ret; |
| 115 | + |
| 116 | + ret = av_tx_init(&s->tx_ctx[1], &s->tx_fn, AV_TX_FLOAT_RDFT, 0, s->fft_size, &scale, 0); |
| 117 | + if (ret < 0) |
| 118 | + return ret; |
| 119 | + |
| 120 | + ret = av_tx_init(&s->itx_ctx, &s->itx_fn, AV_TX_FLOAT_RDFT, 1, s->fft_size, &iscale, 0); |
| 121 | + if (ret < 0) |
| 122 | + return ret; |
| 123 | + |
| 124 | + return 0; |
| 125 | +} |
| 126 | + |
| 127 | +static void apply_window(AudioDialogueEnhanceContext *s, |
| 128 | + const float *in_frame, float *out_frame, const int add_to_out_frame) |
| 129 | +{ |
| 130 | + const float *window = s->window; |
| 131 | + |
| 132 | + if (add_to_out_frame) { |
| 133 | + for (int i = 0; i < s->fft_size; i++) |
| 134 | + out_frame[i] += in_frame[i] * window[i]; |
| 135 | + } else { |
| 136 | + for (int i = 0; i < s->fft_size; i++) |
| 137 | + out_frame[i] = in_frame[i] * window[i]; |
| 138 | + } |
| 139 | +} |
| 140 | + |
| 141 | +static float sqrf(float x) |
| 142 | +{ |
| 143 | + return x * x; |
| 144 | +} |
| 145 | + |
| 146 | +static void get_centere(AVComplexFloat *left, AVComplexFloat *right, |
| 147 | + AVComplexFloat *center, int N) |
| 148 | +{ |
| 149 | + for (int i = 0; i < N; i++) { |
| 150 | + const float l_re = left[i].re; |
| 151 | + const float l_im = left[i].im; |
| 152 | + const float r_re = right[i].re; |
| 153 | + const float r_im = right[i].im; |
| 154 | + const float a = 0.5f * (1.f - sqrtf((sqrf(l_re - r_re) + sqrf(l_im - r_im))/ |
| 155 | + (sqrf(l_re + r_re) + sqrf(l_im + r_im) + FLT_EPSILON))); |
| 156 | + |
| 157 | + center[i].re = a * (l_re + r_re); |
| 158 | + center[i].im = a * (l_im + r_im); |
| 159 | + } |
| 160 | +} |
| 161 | + |
| 162 | +static float flux(float *curf, float *prevf, int N) |
| 163 | +{ |
| 164 | + AVComplexFloat *cur = (AVComplexFloat *)curf; |
| 165 | + AVComplexFloat *prev = (AVComplexFloat *)prevf; |
| 166 | + float sum = 0.f; |
| 167 | + |
| 168 | + for (int i = 0; i < N; i++) { |
| 169 | + float c_re = cur[i].re; |
| 170 | + float c_im = cur[i].im; |
| 171 | + float p_re = prev[i].re; |
| 172 | + float p_im = prev[i].im; |
| 173 | + |
| 174 | + sum += sqrf(hypotf(c_re, c_im) - hypotf(p_re, p_im)); |
| 175 | + } |
| 176 | + |
| 177 | + return sum; |
| 178 | +} |
| 179 | + |
| 180 | +static float fluxlr(float *lf, float *lpf, |
| 181 | + float *rf, float *rpf, |
| 182 | + int N) |
| 183 | +{ |
| 184 | + AVComplexFloat *l = (AVComplexFloat *)lf; |
| 185 | + AVComplexFloat *lp = (AVComplexFloat *)lpf; |
| 186 | + AVComplexFloat *r = (AVComplexFloat *)rf; |
| 187 | + AVComplexFloat *rp = (AVComplexFloat *)rpf; |
| 188 | + float sum = 0.f; |
| 189 | + |
| 190 | + for (int i = 0; i < N; i++) { |
| 191 | + float c_re = l[i].re - r[i].re; |
| 192 | + float c_im = l[i].im - r[i].im; |
| 193 | + float p_re = lp[i].re - rp[i].re; |
| 194 | + float p_im = lp[i].im - rp[i].im; |
| 195 | + |
| 196 | + sum += sqrf(hypotf(c_re, c_im) - hypotf(p_re, p_im)); |
| 197 | + } |
| 198 | + |
| 199 | + return sum; |
| 200 | +} |
| 201 | + |
| 202 | +static float calc_vad(float fc, float flr, float a) |
| 203 | +{ |
| 204 | + const float vad = a * (fc / (fc + flr) - 0.5f); |
| 205 | + |
| 206 | + return av_clipf(vad, 0.f, 1.f); |
| 207 | +} |
| 208 | + |
| 209 | +static void get_final(float *c, float *l, |
| 210 | + float *r, float vad, int N, |
| 211 | + float original, float enhance) |
| 212 | +{ |
| 213 | + AVComplexFloat *center = (AVComplexFloat *)c; |
| 214 | + AVComplexFloat *left = (AVComplexFloat *)l; |
| 215 | + AVComplexFloat *right = (AVComplexFloat *)r; |
| 216 | + |
| 217 | + for (int i = 0; i < N; i++) { |
| 218 | + float cP = sqrf(center[i].re) + sqrf(center[i].im); |
| 219 | + float lrP = sqrf(left[i].re - right[i].re) + sqrf(left[i].im - right[i].im); |
| 220 | + float G = cP / (cP + lrP + FLT_EPSILON); |
| 221 | + float re, im; |
| 222 | + |
| 223 | + re = center[i].re * (original + vad * G * enhance); |
| 224 | + im = center[i].im * (original + vad * G * enhance); |
| 225 | + |
| 226 | + center[i].re = re; |
| 227 | + center[i].im = im; |
| 228 | + } |
| 229 | +} |
| 230 | + |
| 231 | +static int de_stereo(AVFilterContext *ctx, AVFrame *out) |
| 232 | +{ |
| 233 | + AudioDialogueEnhanceContext *s = ctx->priv; |
| 234 | + float *center = (float *)s->center_frame->extended_data[0]; |
| 235 | + float *center_prev = (float *)s->center_frame->extended_data[1]; |
| 236 | + float *left_in = (float *)s->in_frame->extended_data[0]; |
| 237 | + float *right_in = (float *)s->in_frame->extended_data[1]; |
| 238 | + float *left_out = (float *)s->out_dist_frame->extended_data[0]; |
| 239 | + float *right_out = (float *)s->out_dist_frame->extended_data[1]; |
| 240 | + float *left_samples = (float *)s->in->extended_data[0]; |
| 241 | + float *right_samples = (float *)s->in->extended_data[1]; |
| 242 | + float *windowed_left = (float *)s->windowed_frame->extended_data[0]; |
| 243 | + float *windowed_right = (float *)s->windowed_frame->extended_data[1]; |
| 244 | + float *windowed_oleft = (float *)s->windowed_out->extended_data[0]; |
| 245 | + float *windowed_oright = (float *)s->windowed_out->extended_data[1]; |
| 246 | + float *windowed_pleft = (float *)s->windowed_prev->extended_data[0]; |
| 247 | + float *windowed_pright = (float *)s->windowed_prev->extended_data[1]; |
| 248 | + float *left_osamples = (float *)out->extended_data[0]; |
| 249 | + float *right_osamples = (float *)out->extended_data[1]; |
| 250 | + float *center_osamples = (float *)out->extended_data[2]; |
| 251 | + const int offset = s->fft_size - s->overlap; |
| 252 | + float vad; |
| 253 | + |
| 254 | + // shift in/out buffers |
| 255 | + memmove(left_in, &left_in[s->overlap], offset * sizeof(float)); |
| 256 | + memmove(right_in, &right_in[s->overlap], offset * sizeof(float)); |
| 257 | + memmove(left_out, &left_out[s->overlap], offset * sizeof(float)); |
| 258 | + memmove(right_out, &right_out[s->overlap], offset * sizeof(float)); |
| 259 | + |
| 260 | + memcpy(&left_in[offset], left_samples, s->overlap * sizeof(float)); |
| 261 | + memcpy(&right_in[offset], right_samples, s->overlap * sizeof(float)); |
| 262 | + memset(&left_out[offset], 0, s->overlap * sizeof(float)); |
| 263 | + memset(&right_out[offset], 0, s->overlap * sizeof(float)); |
| 264 | + |
| 265 | + apply_window(s, left_in, windowed_left, 0); |
| 266 | + apply_window(s, right_in, windowed_right, 0); |
| 267 | + |
| 268 | + s->tx_fn(s->tx_ctx[0], windowed_oleft, windowed_left, sizeof(float)); |
| 269 | + s->tx_fn(s->tx_ctx[1], windowed_oright, windowed_right, sizeof(float)); |
| 270 | + |
| 271 | + get_centere((AVComplexFloat *)windowed_oleft, |
| 272 | + (AVComplexFloat *)windowed_oright, |
| 273 | + (AVComplexFloat *)center, |
| 274 | + s->fft_size / 2 + 1); |
| 275 | + |
| 276 | + vad = calc_vad(flux(center, center_prev, s->fft_size / 2 + 1), |
| 277 | + fluxlr(windowed_oleft, windowed_pleft, |
| 278 | + windowed_oright, windowed_pright, s->fft_size / 2 + 1), s->voice); |
| 279 | + vad = vad * 0.1 + 0.9 * s->prev_vad; |
| 280 | + s->prev_vad = vad; |
| 281 | + |
| 282 | + memcpy(center_prev, center, s->fft_size * sizeof(float)); |
| 283 | + memcpy(windowed_pleft, windowed_oleft, s->fft_size * sizeof(float)); |
| 284 | + memcpy(windowed_pright, windowed_oright, s->fft_size * sizeof(float)); |
| 285 | + |
| 286 | + get_final(center, windowed_oleft, windowed_oright, vad, s->fft_size / 2 + 1, |
| 287 | + s->original, s->enhance); |
| 288 | + |
| 289 | + s->itx_fn(s->itx_ctx, windowed_oleft, center, sizeof(float)); |
| 290 | + |
| 291 | + apply_window(s, windowed_oleft, left_out, 1); |
| 292 | + |
| 293 | + for (int i = 0; i < s->overlap; i++) { |
| 294 | + // 4 times overlap with squared hanning window results in 1.5 time increase in amplitude |
| 295 | + if (!ctx->is_disabled) |
| 296 | + center_osamples[i] = left_out[i] / 1.5f; |
| 297 | + else |
| 298 | + center_osamples[i] = 0.f; |
| 299 | + left_osamples[i] = left_in[i]; |
| 300 | + right_osamples[i] = right_in[i]; |
| 301 | + } |
| 302 | + |
| 303 | + return 0; |
| 304 | +} |
| 305 | + |
| 306 | +static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
| 307 | +{ |
| 308 | + AVFilterContext *ctx = inlink->dst; |
| 309 | + AVFilterLink *outlink = ctx->outputs[0]; |
| 310 | + AudioDialogueEnhanceContext *s = ctx->priv; |
| 311 | + AVFrame *out; |
| 312 | + int ret; |
| 313 | + |
| 314 | + out = ff_get_audio_buffer(outlink, s->overlap); |
| 315 | + if (!out) { |
| 316 | + ret = AVERROR(ENOMEM); |
| 317 | + goto fail; |
| 318 | + } |
| 319 | + |
| 320 | + s->in = in; |
| 321 | + de_stereo(ctx, out); |
| 322 | + |
| 323 | + out->pts = in->pts; |
| 324 | + out->nb_samples = in->nb_samples; |
| 325 | + ret = ff_filter_frame(outlink, out); |
| 326 | +fail: |
| 327 | + av_frame_free(&in); |
| 328 | + s->in = NULL; |
| 329 | + return ret < 0 ? ret : 0; |
| 330 | +} |
| 331 | + |
| 332 | +static int activate(AVFilterContext *ctx) |
| 333 | +{ |
| 334 | + AVFilterLink *inlink = ctx->inputs[0]; |
| 335 | + AVFilterLink *outlink = ctx->outputs[0]; |
| 336 | + AudioDialogueEnhanceContext *s = ctx->priv; |
| 337 | + AVFrame *in = NULL; |
| 338 | + int ret = 0, status; |
| 339 | + int64_t pts; |
| 340 | + |
| 341 | + FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); |
| 342 | + |
| 343 | + ret = ff_inlink_consume_samples(inlink, s->overlap, s->overlap, &in); |
| 344 | + if (ret < 0) |
| 345 | + return ret; |
| 346 | + |
| 347 | + if (ret > 0) { |
| 348 | + return filter_frame(inlink, in); |
| 349 | + } else if (ff_inlink_acknowledge_status(inlink, &status, &pts)) { |
| 350 | + ff_outlink_set_status(outlink, status, pts); |
| 351 | + return 0; |
| 352 | + } else { |
| 353 | + if (ff_inlink_queued_samples(inlink) >= s->overlap) { |
| 354 | + ff_filter_set_ready(ctx, 10); |
| 355 | + } else if (ff_outlink_frame_wanted(outlink)) { |
| 356 | + ff_inlink_request_frame(inlink); |
| 357 | + } |
| 358 | + return 0; |
| 359 | + } |
| 360 | +} |
| 361 | + |
| 362 | +static av_cold void uninit(AVFilterContext *ctx) |
| 363 | +{ |
| 364 | + AudioDialogueEnhanceContext *s = ctx->priv; |
| 365 | + |
| 366 | + av_freep(&s->window); |
| 367 | + |
| 368 | + av_frame_free(&s->in_frame); |
| 369 | + av_frame_free(&s->center_frame); |
| 370 | + av_frame_free(&s->out_dist_frame); |
| 371 | + av_frame_free(&s->windowed_frame); |
| 372 | + av_frame_free(&s->windowed_out); |
| 373 | + av_frame_free(&s->windowed_prev); |
| 374 | + |
| 375 | + av_tx_uninit(&s->tx_ctx[0]); |
| 376 | + av_tx_uninit(&s->tx_ctx[1]); |
| 377 | + av_tx_uninit(&s->itx_ctx); |
| 378 | +} |
| 379 | + |
| 380 | +static const AVFilterPad inputs[] = { |
| 381 | + { |
| 382 | + .name = "default", |
| 383 | + .type = AVMEDIA_TYPE_AUDIO, |
| 384 | + .config_props = config_input, |
| 385 | + }, |
| 386 | +}; |
| 387 | + |
| 388 | +static const AVFilterPad outputs[] = { |
| 389 | + { |
| 390 | + .name = "default", |
| 391 | + .type = AVMEDIA_TYPE_AUDIO, |
| 392 | + }, |
| 393 | +}; |
| 394 | + |
| 395 | +const AVFilter ff_af_dialoguenhance = { |
| 396 | + .name = "dialoguenhance", |
| 397 | + .description = NULL_IF_CONFIG_SMALL("Audio Dialogue Enhancement."), |
| 398 | + .priv_size = sizeof(AudioDialogueEnhanceContext), |
| 399 | + .priv_class = &dialoguenhance_class, |
| 400 | + .uninit = uninit, |
| 401 | + FILTER_INPUTS(inputs), |
| 402 | + FILTER_OUTPUTS(outputs), |
| 403 | + FILTER_QUERY_FUNC(query_formats), |
| 404 | + .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, |
| 405 | + .activate = activate, |
| 406 | + .process_command = ff_filter_process_command, |
| 407 | +}; |