| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2008 Rob Sykes | ||
| 3 | * Copyright (c) 2017 Paul B Mahol | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "libavutil/channel_layout.h" | ||
| 23 | #include "libavutil/opt.h" | ||
| 24 | #include "avfilter.h" | ||
| 25 | #include "audio.h" | ||
| 26 | #include "filters.h" | ||
| 27 | |||
| 28 | typedef struct AudioContrastContext { | ||
| 29 | const AVClass *class; | ||
| 30 | float contrast; | ||
| 31 | void (*filter)(void **dst, const void **src, | ||
| 32 | int nb_samples, int channels, float contrast); | ||
| 33 | } AudioContrastContext; | ||
| 34 | |||
| 35 | #define OFFSET(x) offsetof(AudioContrastContext, x) | ||
| 36 | #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | ||
| 37 | |||
| 38 | static const AVOption acontrast_options[] = { | ||
| 39 | { "contrast", "set contrast", OFFSET(contrast), AV_OPT_TYPE_FLOAT, {.dbl=33}, 0, 100, A }, | ||
| 40 | { NULL } | ||
| 41 | }; | ||
| 42 | |||
| 43 | AVFILTER_DEFINE_CLASS(acontrast); | ||
| 44 | |||
| 45 | ✗ | static void filter_flt(void **d, const void **s, | |
| 46 | int nb_samples, int channels, | ||
| 47 | float contrast) | ||
| 48 | { | ||
| 49 | ✗ | const float *src = s[0]; | |
| 50 | ✗ | float *dst = d[0]; | |
| 51 | int n, c; | ||
| 52 | |||
| 53 | ✗ | for (n = 0; n < nb_samples; n++) { | |
| 54 | ✗ | for (c = 0; c < channels; c++) { | |
| 55 | ✗ | float d = src[c] * M_PI_2; | |
| 56 | |||
| 57 | ✗ | dst[c] = sinf(d + contrast * sinf(d * 4)); | |
| 58 | } | ||
| 59 | |||
| 60 | ✗ | dst += c; | |
| 61 | ✗ | src += c; | |
| 62 | } | ||
| 63 | ✗ | } | |
| 64 | |||
| 65 | ✗ | static void filter_dbl(void **d, const void **s, | |
| 66 | int nb_samples, int channels, | ||
| 67 | float contrast) | ||
| 68 | { | ||
| 69 | ✗ | const double *src = s[0]; | |
| 70 | ✗ | double *dst = d[0]; | |
| 71 | int n, c; | ||
| 72 | |||
| 73 | ✗ | for (n = 0; n < nb_samples; n++) { | |
| 74 | ✗ | for (c = 0; c < channels; c++) { | |
| 75 | ✗ | double d = src[c] * M_PI_2; | |
| 76 | |||
| 77 | ✗ | dst[c] = sin(d + contrast * sin(d * 4)); | |
| 78 | } | ||
| 79 | |||
| 80 | ✗ | dst += c; | |
| 81 | ✗ | src += c; | |
| 82 | } | ||
| 83 | ✗ | } | |
| 84 | |||
| 85 | ✗ | static void filter_fltp(void **d, const void **s, | |
| 86 | int nb_samples, int channels, | ||
| 87 | float contrast) | ||
| 88 | { | ||
| 89 | int n, c; | ||
| 90 | |||
| 91 | ✗ | for (c = 0; c < channels; c++) { | |
| 92 | ✗ | const float *src = s[c]; | |
| 93 | ✗ | float *dst = d[c]; | |
| 94 | |||
| 95 | ✗ | for (n = 0; n < nb_samples; n++) { | |
| 96 | ✗ | float d = src[n] * M_PI_2; | |
| 97 | |||
| 98 | ✗ | dst[n] = sinf(d + contrast * sinf(d * 4)); | |
| 99 | } | ||
| 100 | } | ||
| 101 | ✗ | } | |
| 102 | |||
| 103 | ✗ | static void filter_dblp(void **d, const void **s, | |
| 104 | int nb_samples, int channels, | ||
| 105 | float contrast) | ||
| 106 | { | ||
| 107 | int n, c; | ||
| 108 | |||
| 109 | ✗ | for (c = 0; c < channels; c++) { | |
| 110 | ✗ | const double *src = s[c]; | |
| 111 | ✗ | double *dst = d[c]; | |
| 112 | |||
| 113 | ✗ | for (n = 0; n < nb_samples; n++) { | |
| 114 | ✗ | double d = src[n] * M_PI_2; | |
| 115 | |||
| 116 | ✗ | dst[n] = sin(d + contrast * sin(d * 4)); | |
| 117 | } | ||
| 118 | } | ||
| 119 | ✗ | } | |
| 120 | |||
| 121 | ✗ | static int config_input(AVFilterLink *inlink) | |
| 122 | { | ||
| 123 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 124 | ✗ | AudioContrastContext *s = ctx->priv; | |
| 125 | |||
| 126 | ✗ | switch (inlink->format) { | |
| 127 | ✗ | case AV_SAMPLE_FMT_FLT: s->filter = filter_flt; break; | |
| 128 | ✗ | case AV_SAMPLE_FMT_DBL: s->filter = filter_dbl; break; | |
| 129 | ✗ | case AV_SAMPLE_FMT_FLTP: s->filter = filter_fltp; break; | |
| 130 | ✗ | case AV_SAMPLE_FMT_DBLP: s->filter = filter_dblp; break; | |
| 131 | } | ||
| 132 | |||
| 133 | ✗ | return 0; | |
| 134 | } | ||
| 135 | |||
| 136 | ✗ | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
| 137 | { | ||
| 138 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 139 | ✗ | AVFilterLink *outlink = ctx->outputs[0]; | |
| 140 | ✗ | AudioContrastContext *s = ctx->priv; | |
| 141 | AVFrame *out; | ||
| 142 | |||
| 143 | ✗ | if (av_frame_is_writable(in)) { | |
| 144 | ✗ | out = in; | |
| 145 | } else { | ||
| 146 | ✗ | out = ff_get_audio_buffer(outlink, in->nb_samples); | |
| 147 | ✗ | if (!out) { | |
| 148 | ✗ | av_frame_free(&in); | |
| 149 | ✗ | return AVERROR(ENOMEM); | |
| 150 | } | ||
| 151 | ✗ | av_frame_copy_props(out, in); | |
| 152 | } | ||
| 153 | |||
| 154 | ✗ | s->filter((void **)out->extended_data, (const void **)in->extended_data, | |
| 155 | ✗ | in->nb_samples, in->ch_layout.nb_channels, s->contrast / 750); | |
| 156 | |||
| 157 | ✗ | if (out != in) | |
| 158 | ✗ | av_frame_free(&in); | |
| 159 | |||
| 160 | ✗ | return ff_filter_frame(outlink, out); | |
| 161 | } | ||
| 162 | |||
| 163 | static const AVFilterPad inputs[] = { | ||
| 164 | { | ||
| 165 | .name = "default", | ||
| 166 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 167 | .filter_frame = filter_frame, | ||
| 168 | .config_props = config_input, | ||
| 169 | }, | ||
| 170 | }; | ||
| 171 | |||
| 172 | const AVFilter ff_af_acontrast = { | ||
| 173 | .name = "acontrast", | ||
| 174 | .description = NULL_IF_CONFIG_SMALL("Simple audio dynamic range compression/expansion filter."), | ||
| 175 | .priv_size = sizeof(AudioContrastContext), | ||
| 176 | .priv_class = &acontrast_class, | ||
| 177 | FILTER_INPUTS(inputs), | ||
| 178 | FILTER_OUTPUTS(ff_audio_default_filterpad), | ||
| 179 | FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP, | ||
| 180 | AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP), | ||
| 181 | }; | ||
| 182 |