2 * Copyright (C) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "libavutil/channel_layout.h"
22 #include "libavutil/opt.h"
27 typedef struct StereoToolsContext {
47 double phase_sin_coef;
48 double phase_cos_coef;
50 double inv_atan_shape;
59 #define OFFSET(x) offsetof(StereoToolsContext, x)
60 #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
62 static const AVOption stereotools_options[] = {
63 { "level_in", "set level in", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
64 { "level_out", "set level out", OFFSET(level_out), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
65 { "balance_in", "set balance in", OFFSET(balance_in), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
66 { "balance_out", "set balance out", OFFSET(balance_out), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
67 { "softclip", "enable softclip", OFFSET(softclip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
68 { "mutel", "mute L", OFFSET(mute_l), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
69 { "muter", "mute R", OFFSET(mute_r), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
70 { "phasel", "phase L", OFFSET(phase_l), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
71 { "phaser", "phase R", OFFSET(phase_r), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
72 { "mode", "set stereo mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 8, A, "mode" },
73 { "lr>lr", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, "mode" },
74 { "lr>ms", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, "mode" },
75 { "ms>lr", 0, 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, A, "mode" },
76 { "lr>ll", 0, 0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, A, "mode" },
77 { "lr>rr", 0, 0, AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, A, "mode" },
78 { "lr>l+r", 0, 0, AV_OPT_TYPE_CONST, {.i64=5}, 0, 0, A, "mode" },
79 { "lr>rl", 0, 0, AV_OPT_TYPE_CONST, {.i64=6}, 0, 0, A, "mode" },
80 { "ms>ll", 0, 0, AV_OPT_TYPE_CONST, {.i64=7}, 0, 0, A, "mode" },
81 { "ms>rr", 0, 0, AV_OPT_TYPE_CONST, {.i64=8}, 0, 0, A, "mode" },
82 { "slev", "set side level", OFFSET(slev), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
83 { "sbal", "set side balance", OFFSET(sbal), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
84 { "mlev", "set middle level", OFFSET(mlev), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
85 { "mpan", "set middle pan", OFFSET(mpan), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
86 { "base", "set stereo base", OFFSET(base), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A },
87 { "delay", "set delay", OFFSET(delay), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -20, 20, A },
88 { "sclevel", "set S/C level", OFFSET(sc_level), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 100, A },
89 { "phase", "set stereo phase", OFFSET(phase), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 360, A },
90 { "bmode_in", "set balance in mode", OFFSET(bmode_in), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, A, "bmode" },
91 { "balance", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, "bmode" },
92 { "amplitude", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, "bmode" },
93 { "power", 0, 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, A, "bmode" },
94 { "bmode_out", "set balance out mode", OFFSET(bmode_out), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, A, "bmode" },
98 AVFILTER_DEFINE_CLASS(stereotools);
100 static int query_formats(AVFilterContext *ctx)
102 AVFilterFormats *formats = NULL;
103 AVFilterChannelLayouts *layout = NULL;
106 if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_DBL )) < 0 ||
107 (ret = ff_set_common_formats (ctx , formats )) < 0 ||
108 (ret = ff_add_channel_layout (&layout , AV_CH_LAYOUT_STEREO)) < 0 ||
109 (ret = ff_set_common_channel_layouts (ctx , layout )) < 0)
112 formats = ff_all_samplerates();
113 return ff_set_common_samplerates(ctx, formats);
116 static int config_input(AVFilterLink *inlink)
118 AVFilterContext *ctx = inlink->dst;
119 StereoToolsContext *s = ctx->priv;
121 s->length = 2 * inlink->sample_rate * 0.05;
122 if (s->length <= 1 || s->length & 1) {
123 av_log(ctx, AV_LOG_ERROR, "sample rate is too small\n");
124 return AVERROR(EINVAL);
126 s->buffer = av_calloc(s->length, sizeof(*s->buffer));
128 return AVERROR(ENOMEM);
130 s->inv_atan_shape = 1.0 / atan(s->sc_level);
131 s->phase_cos_coef = cos(s->phase / 180 * M_PI);
132 s->phase_sin_coef = sin(s->phase / 180 * M_PI);
137 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
139 AVFilterContext *ctx = inlink->dst;
140 AVFilterLink *outlink = ctx->outputs[0];
141 StereoToolsContext *s = ctx->priv;
142 const double *src = (const double *)in->data[0];
143 const double sb = s->base < 0 ? s->base * 0.5 : s->base;
144 const double sbal = 1 + s->sbal;
145 const double mpan = 1 + s->mpan;
146 const double slev = s->slev;
147 const double mlev = s->mlev;
148 const double balance_in = s->balance_in;
149 const double balance_out = s->balance_out;
150 const double level_in = s->level_in;
151 const double level_out = s->level_out;
152 const double sc_level = s->sc_level;
153 const double delay = s->delay;
154 const int length = s->length;
155 const int mute_l = s->mute_l;
156 const int mute_r = s->mute_r;
157 const int phase_l = s->phase_l;
158 const int phase_r = s->phase_r;
159 double *buffer = s->buffer;
162 int nbuf = inlink->sample_rate * (fabs(delay) / 1000.);
166 if (av_frame_is_writable(in)) {
169 out = ff_get_audio_buffer(outlink, in->nb_samples);
172 return AVERROR(ENOMEM);
174 av_frame_copy_props(out, in);
176 dst = (double *)out->data[0];
178 for (n = 0; n < in->nb_samples; n++, src += 2, dst += 2) {
179 double L = src[0], R = src[1], l, r, m, S, gl, gr, gd;
184 gl = 1. - FFMAX(0., balance_in);
185 gr = 1. + FFMIN(0., balance_in);
186 switch (s->bmode_in) {
193 if (balance_in < 0.) {
196 } else if (balance_in > 0.) {
206 R = s->inv_atan_shape * atan(R * sc_level);
207 L = s->inv_atan_shape * atan(L * sc_level);
214 l = m * mlev * FFMIN(1., 2. - mpan) + S * slev * FFMIN(1., 2. - sbal);
215 r = m * mlev * FFMIN(1., mpan) - S * slev * FFMIN(1., sbal);
220 l = L * FFMIN(1., 2. - sbal);
221 r = R * FFMIN(1., sbal);
222 L = 0.5 * (l + r) * mlev;
223 R = 0.5 * (l - r) * slev;
226 l = L * mlev * FFMIN(1., 2. - mpan) + R * slev * FFMIN(1., 2. - sbal);
227 r = L * mlev * FFMIN(1., mpan) - R * slev * FFMIN(1., sbal);
247 l = m * mlev * FFMIN(1., 2. - mpan) + S * slev * FFMIN(1., 2. - sbal);
248 r = m * mlev * FFMIN(1., mpan) - S * slev * FFMIN(1., sbal);
253 l = L * mlev * FFMIN(1., 2. - mpan) + R * slev * FFMIN(1., 2. - sbal);
258 r = L * mlev * FFMIN(1., mpan) - R * slev * FFMIN(1., sbal);
267 L *= (2. * (1. - phase_l)) - 1.;
268 R *= (2. * (1. - phase_r)) - 1.;
271 buffer[s->pos+1] = R;
274 R = buffer[(s->pos - (int)nbuf + 1 + length) % length];
275 } else if (delay < 0.) {
276 L = buffer[(s->pos - (int)nbuf + length) % length];
279 l = L + sb * L - sb * R;
280 r = R + sb * R - sb * L;
285 l = L * s->phase_cos_coef - R * s->phase_sin_coef;
286 r = L * s->phase_sin_coef + R * s->phase_cos_coef;
291 s->pos = (s->pos + 2) % s->length;
293 gl = 1. - FFMAX(0., balance_out);
294 gr = 1. + FFMIN(0., balance_out);
295 switch (s->bmode_out) {
302 if (balance_out < 0.) {
305 } else if (balance_out > 0.) {
324 return ff_filter_frame(outlink, out);
327 static av_cold void uninit(AVFilterContext *ctx)
329 StereoToolsContext *s = ctx->priv;
331 av_freep(&s->buffer);
334 static const AVFilterPad inputs[] = {
337 .type = AVMEDIA_TYPE_AUDIO,
338 .filter_frame = filter_frame,
339 .config_props = config_input,
344 static const AVFilterPad outputs[] = {
347 .type = AVMEDIA_TYPE_AUDIO,
352 AVFilter ff_af_stereotools = {
353 .name = "stereotools",
354 .description = NULL_IF_CONFIG_SMALL("Apply various stereo tools."),
355 .query_formats = query_formats,
356 .priv_size = sizeof(StereoToolsContext),
357 .priv_class = &stereotools_class,