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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 | }; |