| 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 | |||
| 27 | typedef struct AudioContrastContext { | ||
| 28 | const AVClass *class; | ||
| 29 | float contrast; | ||
| 30 | void (*filter)(void **dst, const void **src, | ||
| 31 | int nb_samples, int channels, float contrast); | ||
| 32 | } AudioContrastContext; | ||
| 33 | |||
| 34 | #define OFFSET(x) offsetof(AudioContrastContext, x) | ||
| 35 | #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | ||
| 36 | |||
| 37 | static const AVOption acontrast_options[] = { | ||
| 38 | { "contrast", "set contrast", OFFSET(contrast), AV_OPT_TYPE_FLOAT, {.dbl=33}, 0, 100, A }, | ||
| 39 | { NULL } | ||
| 40 | }; | ||
| 41 | |||
| 42 | AVFILTER_DEFINE_CLASS(acontrast); | ||
| 43 | |||
| 44 | ✗ | static void filter_flt(void **d, const void **s, | |
| 45 | int nb_samples, int channels, | ||
| 46 | float contrast) | ||
| 47 | { | ||
| 48 | ✗ | const float *src = s[0]; | |
| 49 | ✗ | float *dst = d[0]; | |
| 50 | int n, c; | ||
| 51 | |||
| 52 | ✗ | for (n = 0; n < nb_samples; n++) { | |
| 53 | ✗ | for (c = 0; c < channels; c++) { | |
| 54 | ✗ | float d = src[c] * M_PI_2; | |
| 55 | |||
| 56 | ✗ | dst[c] = sinf(d + contrast * sinf(d * 4)); | |
| 57 | } | ||
| 58 | |||
| 59 | ✗ | dst += c; | |
| 60 | ✗ | src += c; | |
| 61 | } | ||
| 62 | ✗ | } | |
| 63 | |||
| 64 | ✗ | static void filter_dbl(void **d, const void **s, | |
| 65 | int nb_samples, int channels, | ||
| 66 | float contrast) | ||
| 67 | { | ||
| 68 | ✗ | const double *src = s[0]; | |
| 69 | ✗ | double *dst = d[0]; | |
| 70 | int n, c; | ||
| 71 | |||
| 72 | ✗ | for (n = 0; n < nb_samples; n++) { | |
| 73 | ✗ | for (c = 0; c < channels; c++) { | |
| 74 | ✗ | double d = src[c] * M_PI_2; | |
| 75 | |||
| 76 | ✗ | dst[c] = sin(d + contrast * sin(d * 4)); | |
| 77 | } | ||
| 78 | |||
| 79 | ✗ | dst += c; | |
| 80 | ✗ | src += c; | |
| 81 | } | ||
| 82 | ✗ | } | |
| 83 | |||
| 84 | ✗ | static void filter_fltp(void **d, const void **s, | |
| 85 | int nb_samples, int channels, | ||
| 86 | float contrast) | ||
| 87 | { | ||
| 88 | int n, c; | ||
| 89 | |||
| 90 | ✗ | for (c = 0; c < channels; c++) { | |
| 91 | ✗ | const float *src = s[c]; | |
| 92 | ✗ | float *dst = d[c]; | |
| 93 | |||
| 94 | ✗ | for (n = 0; n < nb_samples; n++) { | |
| 95 | ✗ | float d = src[n] * M_PI_2; | |
| 96 | |||
| 97 | ✗ | dst[n] = sinf(d + contrast * sinf(d * 4)); | |
| 98 | } | ||
| 99 | } | ||
| 100 | ✗ | } | |
| 101 | |||
| 102 | ✗ | static void filter_dblp(void **d, const void **s, | |
| 103 | int nb_samples, int channels, | ||
| 104 | float contrast) | ||
| 105 | { | ||
| 106 | int n, c; | ||
| 107 | |||
| 108 | ✗ | for (c = 0; c < channels; c++) { | |
| 109 | ✗ | const double *src = s[c]; | |
| 110 | ✗ | double *dst = d[c]; | |
| 111 | |||
| 112 | ✗ | for (n = 0; n < nb_samples; n++) { | |
| 113 | ✗ | double d = src[n] * M_PI_2; | |
| 114 | |||
| 115 | ✗ | dst[n] = sin(d + contrast * sin(d * 4)); | |
| 116 | } | ||
| 117 | } | ||
| 118 | ✗ | } | |
| 119 | |||
| 120 | ✗ | static int config_input(AVFilterLink *inlink) | |
| 121 | { | ||
| 122 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 123 | ✗ | AudioContrastContext *s = ctx->priv; | |
| 124 | |||
| 125 | ✗ | switch (inlink->format) { | |
| 126 | ✗ | case AV_SAMPLE_FMT_FLT: s->filter = filter_flt; break; | |
| 127 | ✗ | case AV_SAMPLE_FMT_DBL: s->filter = filter_dbl; break; | |
| 128 | ✗ | case AV_SAMPLE_FMT_FLTP: s->filter = filter_fltp; break; | |
| 129 | ✗ | case AV_SAMPLE_FMT_DBLP: s->filter = filter_dblp; break; | |
| 130 | } | ||
| 131 | |||
| 132 | ✗ | return 0; | |
| 133 | } | ||
| 134 | |||
| 135 | ✗ | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
| 136 | { | ||
| 137 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 138 | ✗ | AVFilterLink *outlink = ctx->outputs[0]; | |
| 139 | ✗ | AudioContrastContext *s = ctx->priv; | |
| 140 | AVFrame *out; | ||
| 141 | |||
| 142 | ✗ | if (av_frame_is_writable(in)) { | |
| 143 | ✗ | out = in; | |
| 144 | } else { | ||
| 145 | ✗ | out = ff_get_audio_buffer(outlink, in->nb_samples); | |
| 146 | ✗ | if (!out) { | |
| 147 | ✗ | av_frame_free(&in); | |
| 148 | ✗ | return AVERROR(ENOMEM); | |
| 149 | } | ||
| 150 | ✗ | av_frame_copy_props(out, in); | |
| 151 | } | ||
| 152 | |||
| 153 | ✗ | s->filter((void **)out->extended_data, (const void **)in->extended_data, | |
| 154 | ✗ | in->nb_samples, in->ch_layout.nb_channels, s->contrast / 750); | |
| 155 | |||
| 156 | ✗ | if (out != in) | |
| 157 | ✗ | av_frame_free(&in); | |
| 158 | |||
| 159 | ✗ | return ff_filter_frame(outlink, out); | |
| 160 | } | ||
| 161 | |||
| 162 | static const AVFilterPad inputs[] = { | ||
| 163 | { | ||
| 164 | .name = "default", | ||
| 165 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 166 | .filter_frame = filter_frame, | ||
| 167 | .config_props = config_input, | ||
| 168 | }, | ||
| 169 | }; | ||
| 170 | |||
| 171 | const AVFilter ff_af_acontrast = { | ||
| 172 | .name = "acontrast", | ||
| 173 | .description = NULL_IF_CONFIG_SMALL("Simple audio dynamic range compression/expansion filter."), | ||
| 174 | .priv_size = sizeof(AudioContrastContext), | ||
| 175 | .priv_class = &acontrast_class, | ||
| 176 | FILTER_INPUTS(inputs), | ||
| 177 | FILTER_OUTPUTS(ff_audio_default_filterpad), | ||
| 178 | FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP, | ||
| 179 | AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP), | ||
| 180 | }; | ||
| 181 |