| 1 | /* |
| 2 | * Copyright (c) 1999 Chris Bagwell |
| 3 | * Copyright (c) 1999 Nick Bailey |
| 4 | * Copyright (c) 2007 Rob Sykes <robs@users.sourceforge.net> |
| 5 | * Copyright (c) 2013 Paul B Mahol |
| 6 | * Copyright (c) 2014 Andrew Kelley |
| 7 | * |
| 8 | * This file is part of FFmpeg. |
| 9 | * |
| 10 | * FFmpeg is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU Lesser General Public |
| 12 | * License as published by the Free Software Foundation; either |
| 13 | * version 2.1 of the License, or (at your option) any later version. |
| 14 | * |
| 15 | * FFmpeg is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * Lesser General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU Lesser General Public |
| 21 | * License along with FFmpeg; if not, write to the Free Software |
| 22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 23 | */ |
| 24 | |
| 25 | /** |
| 26 | * @file |
| 27 | * audio compand filter |
| 28 | */ |
| 29 | |
| 30 | #include "libavutil/avassert.h" |
| 31 | #include "libavutil/avstring.h" |
| 32 | #include "libavutil/opt.h" |
| 33 | #include "libavutil/samplefmt.h" |
| 34 | #include "audio.h" |
| 35 | #include "avfilter.h" |
| 36 | #include "internal.h" |
| 37 | |
| 38 | typedef struct ChanParam { |
| 39 | double attack; |
| 40 | double decay; |
| 41 | double volume; |
| 42 | } ChanParam; |
| 43 | |
| 44 | typedef struct CompandSegment { |
| 45 | double x, y; |
| 46 | double a, b; |
| 47 | } CompandSegment; |
| 48 | |
| 49 | typedef struct CompandContext { |
| 50 | const AVClass *class; |
| 51 | int nb_segments; |
| 52 | char *attacks, *decays, *points; |
| 53 | CompandSegment *segments; |
| 54 | ChanParam *channels; |
| 55 | double in_min_lin; |
| 56 | double out_min_lin; |
| 57 | double curve_dB; |
| 58 | double gain_dB; |
| 59 | double initial_volume; |
| 60 | double delay; |
| 61 | AVFrame *delay_frame; |
| 62 | int delay_samples; |
| 63 | int delay_count; |
| 64 | int delay_index; |
| 65 | int64_t pts; |
| 66 | |
| 67 | int (*compand)(AVFilterContext *ctx, AVFrame *frame); |
| 68 | } CompandContext; |
| 69 | |
| 70 | #define OFFSET(x) offsetof(CompandContext, x) |
| 71 | #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
| 72 | |
| 73 | static const AVOption compand_options[] = { |
| 74 | { "attacks", "set time over which increase of volume is determined", OFFSET(attacks), AV_OPT_TYPE_STRING, { .str = "0.3" }, 0, 0, A }, |
| 75 | { "decays", "set time over which decrease of volume is determined", OFFSET(decays), AV_OPT_TYPE_STRING, { .str = "0.8" }, 0, 0, A }, |
| 76 | { "points", "set points of transfer function", OFFSET(points), AV_OPT_TYPE_STRING, { .str = "-70/-70|-60/-20" }, 0, 0, A }, |
| 77 | { "soft-knee", "set soft-knee", OFFSET(curve_dB), AV_OPT_TYPE_DOUBLE, { .dbl = 0.01 }, 0.01, 900, A }, |
| 78 | { "gain", "set output gain", OFFSET(gain_dB), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, -900, 900, A }, |
| 79 | { "volume", "set initial volume", OFFSET(initial_volume), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, -900, 0, A }, |
| 80 | { "delay", "set delay for samples before sending them to volume adjuster", OFFSET(delay), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, 20, A }, |
| 81 | { NULL } |
| 82 | }; |
| 83 | |
| 84 | AVFILTER_DEFINE_CLASS(compand); |
| 85 | |
| 86 | static av_cold int init(AVFilterContext *ctx) |
| 87 | { |
| 88 | CompandContext *s = ctx->priv; |
| 89 | s->pts = AV_NOPTS_VALUE; |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static av_cold void uninit(AVFilterContext *ctx) |
| 94 | { |
| 95 | CompandContext *s = ctx->priv; |
| 96 | |
| 97 | av_freep(&s->channels); |
| 98 | av_freep(&s->segments); |
| 99 | av_frame_free(&s->delay_frame); |
| 100 | } |
| 101 | |
| 102 | static int query_formats(AVFilterContext *ctx) |
| 103 | { |
| 104 | AVFilterChannelLayouts *layouts; |
| 105 | AVFilterFormats *formats; |
| 106 | static const enum AVSampleFormat sample_fmts[] = { |
| 107 | AV_SAMPLE_FMT_DBLP, |
| 108 | AV_SAMPLE_FMT_NONE |
| 109 | }; |
| 110 | |
| 111 | layouts = ff_all_channel_layouts(); |
| 112 | if (!layouts) |
| 113 | return AVERROR(ENOMEM); |
| 114 | ff_set_common_channel_layouts(ctx, layouts); |
| 115 | |
| 116 | formats = ff_make_format_list(sample_fmts); |
| 117 | if (!formats) |
| 118 | return AVERROR(ENOMEM); |
| 119 | ff_set_common_formats(ctx, formats); |
| 120 | |
| 121 | formats = ff_all_samplerates(); |
| 122 | if (!formats) |
| 123 | return AVERROR(ENOMEM); |
| 124 | ff_set_common_samplerates(ctx, formats); |
| 125 | |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | static void count_items(char *item_str, int *nb_items) |
| 130 | { |
| 131 | char *p; |
| 132 | |
| 133 | *nb_items = 1; |
| 134 | for (p = item_str; *p; p++) { |
| 135 | if (*p == ' ' || *p == '|') |
| 136 | (*nb_items)++; |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | static void update_volume(ChanParam *cp, double in) |
| 141 | { |
| 142 | double delta = in - cp->volume; |
| 143 | |
| 144 | if (delta > 0.0) |
| 145 | cp->volume += delta * cp->attack; |
| 146 | else |
| 147 | cp->volume += delta * cp->decay; |
| 148 | } |
| 149 | |
| 150 | static double get_volume(CompandContext *s, double in_lin) |
| 151 | { |
| 152 | CompandSegment *cs; |
| 153 | double in_log, out_log; |
| 154 | int i; |
| 155 | |
| 156 | if (in_lin < s->in_min_lin) |
| 157 | return s->out_min_lin; |
| 158 | |
| 159 | in_log = log(in_lin); |
| 160 | |
| 161 | for (i = 1; i < s->nb_segments; i++) |
| 162 | if (in_log <= s->segments[i].x) |
| 163 | break; |
| 164 | cs = &s->segments[i - 1]; |
| 165 | in_log -= cs->x; |
| 166 | out_log = cs->y + in_log * (cs->a * in_log + cs->b); |
| 167 | |
| 168 | return exp(out_log); |
| 169 | } |
| 170 | |
| 171 | static int compand_nodelay(AVFilterContext *ctx, AVFrame *frame) |
| 172 | { |
| 173 | CompandContext *s = ctx->priv; |
| 174 | AVFilterLink *inlink = ctx->inputs[0]; |
| 175 | const int channels = inlink->channels; |
| 176 | const int nb_samples = frame->nb_samples; |
| 177 | AVFrame *out_frame; |
| 178 | int chan, i; |
| 179 | int err; |
| 180 | |
| 181 | if (av_frame_is_writable(frame)) { |
| 182 | out_frame = frame; |
| 183 | } else { |
| 184 | out_frame = ff_get_audio_buffer(inlink, nb_samples); |
| 185 | if (!out_frame) { |
| 186 | av_frame_free(&frame); |
| 187 | return AVERROR(ENOMEM); |
| 188 | } |
| 189 | err = av_frame_copy_props(out_frame, frame); |
| 190 | if (err < 0) { |
| 191 | av_frame_free(&out_frame); |
| 192 | av_frame_free(&frame); |
| 193 | return err; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | for (chan = 0; chan < channels; chan++) { |
| 198 | const double *src = (double *)frame->extended_data[chan]; |
| 199 | double *dst = (double *)out_frame->extended_data[chan]; |
| 200 | ChanParam *cp = &s->channels[chan]; |
| 201 | |
| 202 | for (i = 0; i < nb_samples; i++) { |
| 203 | update_volume(cp, fabs(src[i])); |
| 204 | |
| 205 | dst[i] = av_clipd(src[i] * get_volume(s, cp->volume), -1, 1); |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | if (frame != out_frame) |
| 210 | av_frame_free(&frame); |
| 211 | |
| 212 | return ff_filter_frame(ctx->outputs[0], out_frame); |
| 213 | } |
| 214 | |
| 215 | #define MOD(a, b) (((a) >= (b)) ? (a) - (b) : (a)) |
| 216 | |
| 217 | static int compand_delay(AVFilterContext *ctx, AVFrame *frame) |
| 218 | { |
| 219 | CompandContext *s = ctx->priv; |
| 220 | AVFilterLink *inlink = ctx->inputs[0]; |
| 221 | const int channels = inlink->channels; |
| 222 | const int nb_samples = frame->nb_samples; |
| 223 | int chan, i, av_uninit(dindex), oindex, av_uninit(count); |
| 224 | AVFrame *out_frame = NULL; |
| 225 | int err; |
| 226 | |
| 227 | if (s->pts == AV_NOPTS_VALUE) { |
| 228 | s->pts = (frame->pts == AV_NOPTS_VALUE) ? 0 : frame->pts; |
| 229 | } |
| 230 | |
| 231 | av_assert1(channels > 0); /* would corrupt delay_count and delay_index */ |
| 232 | |
| 233 | for (chan = 0; chan < channels; chan++) { |
| 234 | AVFrame *delay_frame = s->delay_frame; |
| 235 | const double *src = (double *)frame->extended_data[chan]; |
| 236 | double *dbuf = (double *)delay_frame->extended_data[chan]; |
| 237 | ChanParam *cp = &s->channels[chan]; |
| 238 | double *dst; |
| 239 | |
| 240 | count = s->delay_count; |
| 241 | dindex = s->delay_index; |
| 242 | for (i = 0, oindex = 0; i < nb_samples; i++) { |
| 243 | const double in = src[i]; |
| 244 | update_volume(cp, fabs(in)); |
| 245 | |
| 246 | if (count >= s->delay_samples) { |
| 247 | if (!out_frame) { |
| 248 | out_frame = ff_get_audio_buffer(inlink, nb_samples - i); |
| 249 | if (!out_frame) { |
| 250 | av_frame_free(&frame); |
| 251 | return AVERROR(ENOMEM); |
| 252 | } |
| 253 | err = av_frame_copy_props(out_frame, frame); |
| 254 | if (err < 0) { |
| 255 | av_frame_free(&out_frame); |
| 256 | av_frame_free(&frame); |
| 257 | return err; |
| 258 | } |
| 259 | out_frame->pts = s->pts; |
| 260 | s->pts += av_rescale_q(nb_samples - i, |
| 261 | (AVRational){ 1, inlink->sample_rate }, |
| 262 | inlink->time_base); |
| 263 | } |
| 264 | |
| 265 | dst = (double *)out_frame->extended_data[chan]; |
| 266 | dst[oindex++] = av_clipd(dbuf[dindex] * |
| 267 | get_volume(s, cp->volume), -1, 1); |
| 268 | } else { |
| 269 | count++; |
| 270 | } |
| 271 | |
| 272 | dbuf[dindex] = in; |
| 273 | dindex = MOD(dindex + 1, s->delay_samples); |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | s->delay_count = count; |
| 278 | s->delay_index = dindex; |
| 279 | |
| 280 | av_frame_free(&frame); |
| 281 | |
| 282 | if (out_frame) { |
| 283 | err = ff_filter_frame(ctx->outputs[0], out_frame); |
| 284 | return err; |
| 285 | } |
| 286 | |
| 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | static int compand_drain(AVFilterLink *outlink) |
| 291 | { |
| 292 | AVFilterContext *ctx = outlink->src; |
| 293 | CompandContext *s = ctx->priv; |
| 294 | const int channels = outlink->channels; |
| 295 | AVFrame *frame = NULL; |
| 296 | int chan, i, dindex; |
| 297 | |
| 298 | /* 2048 is to limit output frame size during drain */ |
| 299 | frame = ff_get_audio_buffer(outlink, FFMIN(2048, s->delay_count)); |
| 300 | if (!frame) |
| 301 | return AVERROR(ENOMEM); |
| 302 | frame->pts = s->pts; |
| 303 | s->pts += av_rescale_q(frame->nb_samples, |
| 304 | (AVRational){ 1, outlink->sample_rate }, outlink->time_base); |
| 305 | |
| 306 | av_assert0(channels > 0); |
| 307 | for (chan = 0; chan < channels; chan++) { |
| 308 | AVFrame *delay_frame = s->delay_frame; |
| 309 | double *dbuf = (double *)delay_frame->extended_data[chan]; |
| 310 | double *dst = (double *)frame->extended_data[chan]; |
| 311 | ChanParam *cp = &s->channels[chan]; |
| 312 | |
| 313 | dindex = s->delay_index; |
| 314 | for (i = 0; i < frame->nb_samples; i++) { |
| 315 | dst[i] = av_clipd(dbuf[dindex] * get_volume(s, cp->volume), |
| 316 | -1, 1); |
| 317 | dindex = MOD(dindex + 1, s->delay_samples); |
| 318 | } |
| 319 | } |
| 320 | s->delay_count -= frame->nb_samples; |
| 321 | s->delay_index = dindex; |
| 322 | |
| 323 | return ff_filter_frame(outlink, frame); |
| 324 | } |
| 325 | |
| 326 | static int config_output(AVFilterLink *outlink) |
| 327 | { |
| 328 | AVFilterContext *ctx = outlink->src; |
| 329 | CompandContext *s = ctx->priv; |
| 330 | const int sample_rate = outlink->sample_rate; |
| 331 | double radius = s->curve_dB * M_LN10 / 20.0; |
| 332 | char *p, *saveptr = NULL; |
| 333 | const int channels = outlink->channels; |
| 334 | int nb_attacks, nb_decays, nb_points; |
| 335 | int new_nb_items, num; |
| 336 | int i; |
| 337 | int err; |
| 338 | |
| 339 | |
| 340 | count_items(s->attacks, &nb_attacks); |
| 341 | count_items(s->decays, &nb_decays); |
| 342 | count_items(s->points, &nb_points); |
| 343 | |
| 344 | if (channels <= 0) { |
| 345 | av_log(ctx, AV_LOG_ERROR, "Invalid number of channels: %d\n", channels); |
| 346 | return AVERROR(EINVAL); |
| 347 | } |
| 348 | |
| 349 | if (nb_attacks > channels || nb_decays > channels) { |
| 350 | av_log(ctx, AV_LOG_ERROR, |
| 351 | "Number of attacks/decays bigger than number of channels.\n"); |
| 352 | return AVERROR(EINVAL); |
| 353 | } |
| 354 | |
| 355 | uninit(ctx); |
| 356 | |
| 357 | s->channels = av_mallocz_array(channels, sizeof(*s->channels)); |
| 358 | s->nb_segments = (nb_points + 4) * 2; |
| 359 | s->segments = av_mallocz_array(s->nb_segments, sizeof(*s->segments)); |
| 360 | |
| 361 | if (!s->channels || !s->segments) { |
| 362 | uninit(ctx); |
| 363 | return AVERROR(ENOMEM); |
| 364 | } |
| 365 | |
| 366 | p = s->attacks; |
| 367 | for (i = 0, new_nb_items = 0; i < nb_attacks; i++) { |
| 368 | char *tstr = av_strtok(p, " |", &saveptr); |
| 369 | p = NULL; |
| 370 | new_nb_items += sscanf(tstr, "%lf", &s->channels[i].attack) == 1; |
| 371 | if (s->channels[i].attack < 0) { |
| 372 | uninit(ctx); |
| 373 | return AVERROR(EINVAL); |
| 374 | } |
| 375 | } |
| 376 | nb_attacks = new_nb_items; |
| 377 | |
| 378 | p = s->decays; |
| 379 | for (i = 0, new_nb_items = 0; i < nb_decays; i++) { |
| 380 | char *tstr = av_strtok(p, " |", &saveptr); |
| 381 | p = NULL; |
| 382 | new_nb_items += sscanf(tstr, "%lf", &s->channels[i].decay) == 1; |
| 383 | if (s->channels[i].decay < 0) { |
| 384 | uninit(ctx); |
| 385 | return AVERROR(EINVAL); |
| 386 | } |
| 387 | } |
| 388 | nb_decays = new_nb_items; |
| 389 | |
| 390 | if (nb_attacks != nb_decays) { |
| 391 | av_log(ctx, AV_LOG_ERROR, |
| 392 | "Number of attacks %d differs from number of decays %d.\n", |
| 393 | nb_attacks, nb_decays); |
| 394 | uninit(ctx); |
| 395 | return AVERROR(EINVAL); |
| 396 | } |
| 397 | |
| 398 | #define S(x) s->segments[2 * ((x) + 1)] |
| 399 | p = s->points; |
| 400 | for (i = 0, new_nb_items = 0; i < nb_points; i++) { |
| 401 | char *tstr = av_strtok(p, " |", &saveptr); |
| 402 | p = NULL; |
| 403 | if (sscanf(tstr, "%lf/%lf", &S(i).x, &S(i).y) != 2) { |
| 404 | av_log(ctx, AV_LOG_ERROR, |
| 405 | "Invalid and/or missing input/output value.\n"); |
| 406 | uninit(ctx); |
| 407 | return AVERROR(EINVAL); |
| 408 | } |
| 409 | if (i && S(i - 1).x > S(i).x) { |
| 410 | av_log(ctx, AV_LOG_ERROR, |
| 411 | "Transfer function input values must be increasing.\n"); |
| 412 | uninit(ctx); |
| 413 | return AVERROR(EINVAL); |
| 414 | } |
| 415 | S(i).y -= S(i).x; |
| 416 | av_log(ctx, AV_LOG_DEBUG, "%d: x=%f y=%f\n", i, S(i).x, S(i).y); |
| 417 | new_nb_items++; |
| 418 | } |
| 419 | num = new_nb_items; |
| 420 | |
| 421 | /* Add 0,0 if necessary */ |
| 422 | if (num == 0 || S(num - 1).x) |
| 423 | num++; |
| 424 | |
| 425 | #undef S |
| 426 | #define S(x) s->segments[2 * (x)] |
| 427 | /* Add a tail off segment at the start */ |
| 428 | S(0).x = S(1).x - 2 * s->curve_dB; |
| 429 | S(0).y = S(1).y; |
| 430 | num++; |
| 431 | |
| 432 | /* Join adjacent colinear segments */ |
| 433 | for (i = 2; i < num; i++) { |
| 434 | double g1 = (S(i - 1).y - S(i - 2).y) * (S(i - 0).x - S(i - 1).x); |
| 435 | double g2 = (S(i - 0).y - S(i - 1).y) * (S(i - 1).x - S(i - 2).x); |
| 436 | int j; |
| 437 | |
| 438 | if (fabs(g1 - g2)) |
| 439 | continue; |
| 440 | num--; |
| 441 | for (j = --i; j < num; j++) |
| 442 | S(j) = S(j + 1); |
| 443 | } |
| 444 | |
| 445 | for (i = 0; !i || s->segments[i - 2].x; i += 2) { |
| 446 | s->segments[i].y += s->gain_dB; |
| 447 | s->segments[i].x *= M_LN10 / 20; |
| 448 | s->segments[i].y *= M_LN10 / 20; |
| 449 | } |
| 450 | |
| 451 | #define L(x) s->segments[i - (x)] |
| 452 | for (i = 4; s->segments[i - 2].x; i += 2) { |
| 453 | double x, y, cx, cy, in1, in2, out1, out2, theta, len, r; |
| 454 | |
| 455 | L(4).a = 0; |
| 456 | L(4).b = (L(2).y - L(4).y) / (L(2).x - L(4).x); |
| 457 | |
| 458 | L(2).a = 0; |
| 459 | L(2).b = (L(0).y - L(2).y) / (L(0).x - L(2).x); |
| 460 | |
| 461 | theta = atan2(L(2).y - L(4).y, L(2).x - L(4).x); |
| 462 | len = sqrt(pow(L(2).x - L(4).x, 2.) + pow(L(2).y - L(4).y, 2.)); |
| 463 | r = FFMIN(radius, len); |
| 464 | L(3).x = L(2).x - r * cos(theta); |
| 465 | L(3).y = L(2).y - r * sin(theta); |
| 466 | |
| 467 | theta = atan2(L(0).y - L(2).y, L(0).x - L(2).x); |
| 468 | len = sqrt(pow(L(0).x - L(2).x, 2.) + pow(L(0).y - L(2).y, 2.)); |
| 469 | r = FFMIN(radius, len / 2); |
| 470 | x = L(2).x + r * cos(theta); |
| 471 | y = L(2).y + r * sin(theta); |
| 472 | |
| 473 | cx = (L(3).x + L(2).x + x) / 3; |
| 474 | cy = (L(3).y + L(2).y + y) / 3; |
| 475 | |
| 476 | L(2).x = x; |
| 477 | L(2).y = y; |
| 478 | |
| 479 | in1 = cx - L(3).x; |
| 480 | out1 = cy - L(3).y; |
| 481 | in2 = L(2).x - L(3).x; |
| 482 | out2 = L(2).y - L(3).y; |
| 483 | L(3).a = (out2 / in2 - out1 / in1) / (in2 - in1); |
| 484 | L(3).b = out1 / in1 - L(3).a * in1; |
| 485 | } |
| 486 | L(3).x = 0; |
| 487 | L(3).y = L(2).y; |
| 488 | |
| 489 | s->in_min_lin = exp(s->segments[1].x); |
| 490 | s->out_min_lin = exp(s->segments[1].y); |
| 491 | |
| 492 | for (i = 0; i < channels; i++) { |
| 493 | ChanParam *cp = &s->channels[i]; |
| 494 | |
| 495 | if (cp->attack > 1.0 / sample_rate) |
| 496 | cp->attack = 1.0 - exp(-1.0 / (sample_rate * cp->attack)); |
| 497 | else |
| 498 | cp->attack = 1.0; |
| 499 | if (cp->decay > 1.0 / sample_rate) |
| 500 | cp->decay = 1.0 - exp(-1.0 / (sample_rate * cp->decay)); |
| 501 | else |
| 502 | cp->decay = 1.0; |
| 503 | cp->volume = pow(10.0, s->initial_volume / 20); |
| 504 | } |
| 505 | |
| 506 | s->delay_samples = s->delay * sample_rate; |
| 507 | if (s->delay_samples <= 0) { |
| 508 | s->compand = compand_nodelay; |
| 509 | return 0; |
| 510 | } |
| 511 | |
| 512 | s->delay_frame = av_frame_alloc(); |
| 513 | if (!s->delay_frame) { |
| 514 | uninit(ctx); |
| 515 | return AVERROR(ENOMEM); |
| 516 | } |
| 517 | |
| 518 | s->delay_frame->format = outlink->format; |
| 519 | s->delay_frame->nb_samples = s->delay_samples; |
| 520 | s->delay_frame->channel_layout = outlink->channel_layout; |
| 521 | |
| 522 | err = av_frame_get_buffer(s->delay_frame, 32); |
| 523 | if (err) |
| 524 | return err; |
| 525 | |
| 526 | outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; |
| 527 | s->compand = compand_delay; |
| 528 | return 0; |
| 529 | } |
| 530 | |
| 531 | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) |
| 532 | { |
| 533 | AVFilterContext *ctx = inlink->dst; |
| 534 | CompandContext *s = ctx->priv; |
| 535 | |
| 536 | return s->compand(ctx, frame); |
| 537 | } |
| 538 | |
| 539 | static int request_frame(AVFilterLink *outlink) |
| 540 | { |
| 541 | AVFilterContext *ctx = outlink->src; |
| 542 | CompandContext *s = ctx->priv; |
| 543 | int ret = 0; |
| 544 | |
| 545 | ret = ff_request_frame(ctx->inputs[0]); |
| 546 | |
| 547 | if (ret == AVERROR_EOF && !ctx->is_disabled && s->delay_count) |
| 548 | ret = compand_drain(outlink); |
| 549 | |
| 550 | return ret; |
| 551 | } |
| 552 | |
| 553 | static const AVFilterPad compand_inputs[] = { |
| 554 | { |
| 555 | .name = "default", |
| 556 | .type = AVMEDIA_TYPE_AUDIO, |
| 557 | .filter_frame = filter_frame, |
| 558 | }, |
| 559 | { NULL } |
| 560 | }; |
| 561 | |
| 562 | static const AVFilterPad compand_outputs[] = { |
| 563 | { |
| 564 | .name = "default", |
| 565 | .request_frame = request_frame, |
| 566 | .config_props = config_output, |
| 567 | .type = AVMEDIA_TYPE_AUDIO, |
| 568 | }, |
| 569 | { NULL } |
| 570 | }; |
| 571 | |
| 572 | |
| 573 | AVFilter ff_af_compand = { |
| 574 | .name = "compand", |
| 575 | .description = NULL_IF_CONFIG_SMALL( |
| 576 | "Compress or expand audio dynamic range."), |
| 577 | .query_formats = query_formats, |
| 578 | .priv_size = sizeof(CompandContext), |
| 579 | .priv_class = &compand_class, |
| 580 | .init = init, |
| 581 | .uninit = uninit, |
| 582 | .inputs = compand_inputs, |
| 583 | .outputs = compand_outputs, |
| 584 | }; |