| /* |
| * Copyright (C) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/opt.h" |
| #include "avfilter.h" |
| #include "audio.h" |
| #include "formats.h" |
| |
| typedef struct StereoToolsContext { |
| const AVClass *class; |
| |
| int softclip; |
| int mute_l; |
| int mute_r; |
| int phase_l; |
| int phase_r; |
| int mode; |
| int bmode_in; |
| int bmode_out; |
| double slev; |
| double sbal; |
| double mlev; |
| double mpan; |
| double phase; |
| double base; |
| double delay; |
| double balance_in; |
| double balance_out; |
| double phase_sin_coef; |
| double phase_cos_coef; |
| double sc_level; |
| double inv_atan_shape; |
| double level_in; |
| double level_out; |
| |
| double *buffer; |
| int length; |
| int pos; |
| } StereoToolsContext; |
| |
| #define OFFSET(x) offsetof(StereoToolsContext, x) |
| #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM |
| |
| static const AVOption stereotools_options[] = { |
| { "level_in", "set level in", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A }, |
| { "level_out", "set level out", OFFSET(level_out), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A }, |
| { "balance_in", "set balance in", OFFSET(balance_in), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A }, |
| { "balance_out", "set balance out", OFFSET(balance_out), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A }, |
| { "softclip", "enable softclip", OFFSET(softclip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A }, |
| { "mutel", "mute L", OFFSET(mute_l), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A }, |
| { "muter", "mute R", OFFSET(mute_r), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A }, |
| { "phasel", "phase L", OFFSET(phase_l), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A }, |
| { "phaser", "phase R", OFFSET(phase_r), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A }, |
| { "mode", "set stereo mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 10, A, "mode" }, |
| { "lr>lr", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, "mode" }, |
| { "lr>ms", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, "mode" }, |
| { "ms>lr", 0, 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, A, "mode" }, |
| { "lr>ll", 0, 0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, A, "mode" }, |
| { "lr>rr", 0, 0, AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, A, "mode" }, |
| { "lr>l+r", 0, 0, AV_OPT_TYPE_CONST, {.i64=5}, 0, 0, A, "mode" }, |
| { "lr>rl", 0, 0, AV_OPT_TYPE_CONST, {.i64=6}, 0, 0, A, "mode" }, |
| { "ms>ll", 0, 0, AV_OPT_TYPE_CONST, {.i64=7}, 0, 0, A, "mode" }, |
| { "ms>rr", 0, 0, AV_OPT_TYPE_CONST, {.i64=8}, 0, 0, A, "mode" }, |
| { "ms>rl", 0, 0, AV_OPT_TYPE_CONST, {.i64=9}, 0, 0, A, "mode" }, |
| { "lr>l-r", 0, 0, AV_OPT_TYPE_CONST, {.i64=10}, 0, 0, A, "mode" }, |
| { "slev", "set side level", OFFSET(slev), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A }, |
| { "sbal", "set side balance", OFFSET(sbal), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A }, |
| { "mlev", "set middle level", OFFSET(mlev), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A }, |
| { "mpan", "set middle pan", OFFSET(mpan), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A }, |
| { "base", "set stereo base", OFFSET(base), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A }, |
| { "delay", "set delay", OFFSET(delay), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -20, 20, A }, |
| { "sclevel", "set S/C level", OFFSET(sc_level), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 100, A }, |
| { "phase", "set stereo phase", OFFSET(phase), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 360, A }, |
| { "bmode_in", "set balance in mode", OFFSET(bmode_in), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, A, "bmode" }, |
| { "balance", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, "bmode" }, |
| { "amplitude", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, "bmode" }, |
| { "power", 0, 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, A, "bmode" }, |
| { "bmode_out", "set balance out mode", OFFSET(bmode_out), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, A, "bmode" }, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(stereotools); |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| AVFilterFormats *formats = NULL; |
| AVFilterChannelLayouts *layout = NULL; |
| int ret; |
| |
| if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_DBL )) < 0 || |
| (ret = ff_set_common_formats (ctx , formats )) < 0 || |
| (ret = ff_add_channel_layout (&layout , AV_CH_LAYOUT_STEREO)) < 0 || |
| (ret = ff_set_common_channel_layouts (ctx , layout )) < 0) |
| return ret; |
| |
| formats = ff_all_samplerates(); |
| return ff_set_common_samplerates(ctx, formats); |
| } |
| |
| static int config_input(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| StereoToolsContext *s = ctx->priv; |
| |
| s->length = FFALIGN(inlink->sample_rate / 10, 2); |
| if (!s->buffer) |
| s->buffer = av_calloc(s->length, sizeof(*s->buffer)); |
| if (!s->buffer) |
| return AVERROR(ENOMEM); |
| |
| s->inv_atan_shape = 1.0 / atan(s->sc_level); |
| s->phase_cos_coef = cos(s->phase / 180 * M_PI); |
| s->phase_sin_coef = sin(s->phase / 180 * M_PI); |
| |
| return 0; |
| } |
| |
| static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| StereoToolsContext *s = ctx->priv; |
| const double *src = (const double *)in->data[0]; |
| const double sb = s->base < 0 ? s->base * 0.5 : s->base; |
| const double sbal = 1 + s->sbal; |
| const double mpan = 1 + s->mpan; |
| const double slev = s->slev; |
| const double mlev = s->mlev; |
| const double balance_in = s->balance_in; |
| const double balance_out = s->balance_out; |
| const double level_in = s->level_in; |
| const double level_out = s->level_out; |
| const double sc_level = s->sc_level; |
| const double delay = s->delay; |
| const int length = s->length; |
| const int mute_l = s->mute_l; |
| const int mute_r = s->mute_r; |
| const int phase_l = s->phase_l; |
| const int phase_r = s->phase_r; |
| double *buffer = s->buffer; |
| AVFrame *out; |
| double *dst; |
| int nbuf = inlink->sample_rate * (fabs(delay) / 1000.); |
| int n; |
| |
| nbuf -= nbuf % 2; |
| if (av_frame_is_writable(in)) { |
| out = in; |
| } else { |
| out = ff_get_audio_buffer(outlink, in->nb_samples); |
| if (!out) { |
| av_frame_free(&in); |
| return AVERROR(ENOMEM); |
| } |
| av_frame_copy_props(out, in); |
| } |
| dst = (double *)out->data[0]; |
| |
| for (n = 0; n < in->nb_samples; n++, src += 2, dst += 2) { |
| double L = src[0], R = src[1], l, r, m, S, gl, gr, gd; |
| |
| L *= level_in; |
| R *= level_in; |
| |
| gl = 1. - FFMAX(0., balance_in); |
| gr = 1. + FFMIN(0., balance_in); |
| switch (s->bmode_in) { |
| case 1: |
| gd = gl - gr; |
| gl = 1. + gd; |
| gr = 1. - gd; |
| break; |
| case 2: |
| if (balance_in < 0.) { |
| gr = FFMAX(0.5, gr); |
| gl = 1. / gr; |
| } else if (balance_in > 0.) { |
| gl = FFMAX(0.5, gl); |
| gr = 1. / gl; |
| } |
| break; |
| } |
| L *= gl; |
| R *= gr; |
| |
| if (s->softclip) { |
| R = s->inv_atan_shape * atan(R * sc_level); |
| L = s->inv_atan_shape * atan(L * sc_level); |
| } |
| |
| switch (s->mode) { |
| case 0: |
| m = (L + R) * 0.5; |
| S = (L - R) * 0.5; |
| l = m * mlev * FFMIN(1., 2. - mpan) + S * slev * FFMIN(1., 2. - sbal); |
| r = m * mlev * FFMIN(1., mpan) - S * slev * FFMIN(1., sbal); |
| L = l; |
| R = r; |
| break; |
| case 1: |
| l = L * FFMIN(1., 2. - sbal); |
| r = R * FFMIN(1., sbal); |
| L = 0.5 * (l + r) * mlev; |
| R = 0.5 * (l - r) * slev; |
| break; |
| case 2: |
| l = L * mlev * FFMIN(1., 2. - mpan) + R * slev * FFMIN(1., 2. - sbal); |
| r = L * mlev * FFMIN(1., mpan) - R * slev * FFMIN(1., sbal); |
| L = l; |
| R = r; |
| break; |
| case 3: |
| R = L; |
| break; |
| case 4: |
| L = R; |
| break; |
| case 5: |
| L = (L + R) * 0.5; |
| R = L; |
| break; |
| case 6: |
| l = L; |
| L = R; |
| R = l; |
| m = (L + R) * 0.5; |
| S = (L - R) * 0.5; |
| l = m * mlev * FFMIN(1., 2. - mpan) + S * slev * FFMIN(1., 2. - sbal); |
| r = m * mlev * FFMIN(1., mpan) - S * slev * FFMIN(1., sbal); |
| L = l; |
| R = r; |
| break; |
| case 7: |
| l = L * mlev * FFMIN(1., 2. - mpan) + R * slev * FFMIN(1., 2. - sbal); |
| L = l; |
| R = l; |
| break; |
| case 8: |
| r = L * mlev * FFMIN(1., mpan) - R * slev * FFMIN(1., sbal); |
| L = r; |
| R = r; |
| break; |
| case 9: |
| l = L * mlev * FFMIN(1., 2. - mpan) + R * slev * FFMIN(1., 2. - sbal); |
| r = L * mlev * FFMIN(1., mpan) - R * slev * FFMIN(1., sbal); |
| L = r; |
| R = l; |
| break; |
| case 10: |
| L = (L - R) * 0.5; |
| R = L; |
| break; |
| } |
| |
| L *= 1. - mute_l; |
| R *= 1. - mute_r; |
| |
| L *= (2. * (1. - phase_l)) - 1.; |
| R *= (2. * (1. - phase_r)) - 1.; |
| |
| buffer[s->pos ] = L; |
| buffer[s->pos+1] = R; |
| |
| if (delay > 0.) { |
| R = buffer[(s->pos - (int)nbuf + 1 + length) % length]; |
| } else if (delay < 0.) { |
| L = buffer[(s->pos - (int)nbuf + length) % length]; |
| } |
| |
| l = L + sb * L - sb * R; |
| r = R + sb * R - sb * L; |
| |
| L = l; |
| R = r; |
| |
| l = L * s->phase_cos_coef - R * s->phase_sin_coef; |
| r = L * s->phase_sin_coef + R * s->phase_cos_coef; |
| |
| L = l; |
| R = r; |
| |
| s->pos = (s->pos + 2) % s->length; |
| |
| gl = 1. - FFMAX(0., balance_out); |
| gr = 1. + FFMIN(0., balance_out); |
| switch (s->bmode_out) { |
| case 1: |
| gd = gl - gr; |
| gl = 1. + gd; |
| gr = 1. - gd; |
| break; |
| case 2: |
| if (balance_out < 0.) { |
| gr = FFMAX(0.5, gr); |
| gl = 1. / gr; |
| } else if (balance_out > 0.) { |
| gl = FFMAX(0.5, gl); |
| gr = 1. / gl; |
| } |
| break; |
| } |
| L *= gl; |
| R *= gr; |
| |
| |
| L *= level_out; |
| R *= level_out; |
| |
| if (ctx->is_disabled) { |
| dst[0] = src[0]; |
| dst[1] = src[1]; |
| } else { |
| dst[0] = L; |
| dst[1] = R; |
| } |
| } |
| |
| if (out != in) |
| av_frame_free(&in); |
| return ff_filter_frame(outlink, out); |
| } |
| |
| static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, |
| char *res, int res_len, int flags) |
| { |
| int ret; |
| |
| ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags); |
| if (ret < 0) |
| return ret; |
| |
| return config_input(ctx->inputs[0]); |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| StereoToolsContext *s = ctx->priv; |
| |
| av_freep(&s->buffer); |
| } |
| |
| static const AVFilterPad inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .filter_frame = filter_frame, |
| .config_props = config_input, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_af_stereotools = { |
| .name = "stereotools", |
| .description = NULL_IF_CONFIG_SMALL("Apply various stereo tools."), |
| .query_formats = query_formats, |
| .priv_size = sizeof(StereoToolsContext), |
| .priv_class = &stereotools_class, |
| .uninit = uninit, |
| .inputs = inputs, |
| .outputs = outputs, |
| .process_command = process_command, |
| .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, |
| }; |
