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| 1 | +/* |
| 2 | + * Copyright (c) 2013 Paul B Mahol |
| 3 | + * |
| 4 | + * This file is part of FFmpeg. |
| 5 | + * |
| 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. |
| 10 | + * |
| 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. |
| 15 | + * |
| 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 |
| 19 | + */ |
| 20 | + |
| 21 | +/** |
| 22 | + * @file |
| 23 | + * fade audio filter |
| 24 | + */ |
| 25 | + |
| 26 | +#include "libavutil/opt.h" |
| 27 | +#include "audio.h" |
| 28 | +#include "avfilter.h" |
| 29 | +#include "internal.h" |
| 30 | + |
| 31 | +typedef struct { |
| 32 | + const AVClass *class; |
| 33 | + int type; |
| 34 | + int curve; |
| 35 | + int nb_samples; |
| 36 | + int64_t start_sample; |
| 37 | + double duration; |
| 38 | + double start_time; |
| 39 | + |
| 40 | + void (*fade_samples)(uint8_t **dst, uint8_t * const *src, |
| 41 | + int nb_samples, int channels, int direction, |
| 42 | + int64_t start, int range, int curve); |
| 43 | +} AudioFadeContext; |
| 44 | + |
| 45 | +enum CurveType { TRI, QSIN, ESIN, HSIN, LOG, PAR, QUA, CUB, SQU, CBR }; |
| 46 | + |
| 47 | +#define OFFSET(x) offsetof(AudioFadeContext, x) |
| 48 | +#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
| 49 | + |
| 50 | +static const AVOption afade_options[] = { |
| 51 | + { "type", "set the fade direction", OFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, FLAGS, "type" }, |
| 52 | + { "t", "set the fade direction", OFFSET(type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, FLAGS, "type" }, |
| 53 | + { "in", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, FLAGS, "type" }, |
| 54 | + { "out", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, FLAGS, "type" }, |
| 55 | + { "start_sample", "set expression of sample to start fading", OFFSET(start_sample), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, FLAGS }, |
| 56 | + { "ss", "set expression of sample to start fading", OFFSET(start_sample), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, FLAGS }, |
| 57 | + { "nb_samples", "set expression for fade duration in samples", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT32_MAX, FLAGS }, |
| 58 | + { "ns", "set expression for fade duration in samples", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 44100}, 1, INT32_MAX, FLAGS }, |
| 59 | + { "start_time", "set expression of second to start fading", OFFSET(start_time), AV_OPT_TYPE_DOUBLE, {.dbl = 0. }, 0, 7*24*60*60,FLAGS }, |
| 60 | + { "st", "set expression of second to start fading", OFFSET(start_time), AV_OPT_TYPE_DOUBLE, {.dbl = 0. }, 0, 7*24*60*60,FLAGS }, |
| 61 | + { "duration", "set expression for fade duration in seconds", OFFSET(duration), AV_OPT_TYPE_DOUBLE, {.dbl = 0. }, 0, 24*60*60, FLAGS }, |
| 62 | + { "d", "set expression for fade duration in seconds", OFFSET(duration), AV_OPT_TYPE_DOUBLE, {.dbl = 0. }, 0, 24*60*60, FLAGS }, |
| 63 | + { "curve", "set expression for fade curve", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, TRI, CBR, FLAGS, "curve" }, |
| 64 | + { "c", "set expression for fade curve", OFFSET(curve), AV_OPT_TYPE_INT, {.i64 = TRI }, TRI, CBR, FLAGS, "curve" }, |
| 65 | + { "tri", "linear slope", 0, AV_OPT_TYPE_CONST, {.i64 = TRI }, 0, 0, FLAGS, "curve" }, |
| 66 | + { "qsin", "quarter of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = QSIN }, 0, 0, FLAGS, "curve" }, |
| 67 | + { "esin", "exponential sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = ESIN }, 0, 0, FLAGS, "curve" }, |
| 68 | + { "hsin", "half of sine wave", 0, AV_OPT_TYPE_CONST, {.i64 = HSIN }, 0, 0, FLAGS, "curve" }, |
| 69 | + { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64 = LOG }, 0, 0, FLAGS, "curve" }, |
| 70 | + { "par", "inverted parabola", 0, AV_OPT_TYPE_CONST, {.i64 = PAR }, 0, 0, FLAGS, "curve" }, |
| 71 | + { "qua", "quadratic", 0, AV_OPT_TYPE_CONST, {.i64 = QUA }, 0, 0, FLAGS, "curve" }, |
| 72 | + { "cub", "cubic", 0, AV_OPT_TYPE_CONST, {.i64 = CUB }, 0, 0, FLAGS, "curve" }, |
| 73 | + { "squ", "square root", 0, AV_OPT_TYPE_CONST, {.i64 = SQU }, 0, 0, FLAGS, "curve" }, |
| 74 | + { "cbr", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64 = CBR }, 0, 0, FLAGS, "curve" }, |
| 75 | + {NULL}, |
| 76 | +}; |
| 77 | + |
| 78 | +AVFILTER_DEFINE_CLASS(afade); |
| 79 | + |
| 80 | +static av_cold int init(AVFilterContext *ctx, const char *args) |
| 81 | +{ |
| 82 | + AudioFadeContext *afade = ctx->priv; |
| 83 | + int ret; |
| 84 | + |
| 85 | + afade->class = &afade_class; |
| 86 | + av_opt_set_defaults(afade); |
| 87 | + |
| 88 | + if ((ret = av_set_options_string(afade, args, "=", ":")) < 0) |
| 89 | + return ret; |
| 90 | + |
| 91 | + if (INT64_MAX - afade->nb_samples < afade->start_sample) |
| 92 | + return AVERROR(EINVAL); |
| 93 | + |
| 94 | + return 0; |
| 95 | +} |
| 96 | + |
| 97 | +static int query_formats(AVFilterContext *ctx) |
| 98 | +{ |
| 99 | + AVFilterFormats *formats; |
| 100 | + AVFilterChannelLayouts *layouts; |
| 101 | + static const enum AVSampleFormat sample_fmts[] = { |
| 102 | + AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16P, |
| 103 | + AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32P, |
| 104 | + AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP, |
| 105 | + AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP, |
| 106 | + AV_SAMPLE_FMT_NONE |
| 107 | + }; |
| 108 | + |
| 109 | + layouts = ff_all_channel_layouts(); |
| 110 | + if (!layouts) |
| 111 | + return AVERROR(ENOMEM); |
| 112 | + ff_set_common_channel_layouts(ctx, layouts); |
| 113 | + |
| 114 | + formats = ff_make_format_list(sample_fmts); |
| 115 | + if (!formats) |
| 116 | + return AVERROR(ENOMEM); |
| 117 | + ff_set_common_formats(ctx, formats); |
| 118 | + |
| 119 | + formats = ff_all_samplerates(); |
| 120 | + if (!formats) |
| 121 | + return AVERROR(ENOMEM); |
| 122 | + ff_set_common_samplerates(ctx, formats); |
| 123 | + |
| 124 | + return 0; |
| 125 | +} |
| 126 | + |
| 127 | +static double fade_gain(int curve, int64_t index, int range) |
| 128 | +{ |
| 129 | + double gain; |
| 130 | + |
| 131 | + gain = FFMAX(0.0, FFMIN(1.0, 1.0 * index / range)); |
| 132 | + |
| 133 | + switch (curve) { |
| 134 | + case QSIN: |
| 135 | + gain = sin(gain * M_PI / 2.0); |
| 136 | + break; |
| 137 | + case ESIN: |
| 138 | + gain = 1.0 - cos(M_PI / 4.0 * (pow(2.0*gain - 1, 3) + 1)); |
| 139 | + break; |
| 140 | + case HSIN: |
| 141 | + gain = (1.0 - cos(gain * M_PI)) / 2.0; |
| 142 | + break; |
| 143 | + case LOG: |
| 144 | + gain = pow(0.1, (1 - gain) * 5.0); |
| 145 | + break; |
| 146 | + case PAR: |
| 147 | + gain = (1 - (1 - gain) * (1 - gain)); |
| 148 | + break; |
| 149 | + case QUA: |
| 150 | + gain *= gain; |
| 151 | + break; |
| 152 | + case CUB: |
| 153 | + gain = gain * gain * gain; |
| 154 | + break; |
| 155 | + case SQU: |
| 156 | + gain = sqrt(gain); |
| 157 | + break; |
| 158 | + case CBR: |
| 159 | + gain = cbrt(gain); |
| 160 | + break; |
| 161 | + } |
| 162 | + |
| 163 | + return gain; |
| 164 | +} |
| 165 | + |
| 166 | +#define FADE_PLANAR(name, type) \ |
| 167 | +static void fade_samples_## name ##p(uint8_t **dst, uint8_t * const *src, \ |
| 168 | + int nb_samples, int channels, int dir, \ |
| 169 | + int64_t start, int range, int curve) \ |
| 170 | +{ \ |
| 171 | + int i, c; \ |
| 172 | + \ |
| 173 | + for (i = 0; i < nb_samples; i++) { \ |
| 174 | + double gain = fade_gain(curve, start + i * dir, range); \ |
| 175 | + for (c = 0; c < channels; c++) { \ |
| 176 | + type *d = (type *)dst[c]; \ |
| 177 | + const type *s = (type *)src[c]; \ |
| 178 | + \ |
| 179 | + d[i] = s[i] * gain; \ |
| 180 | + } \ |
| 181 | + } \ |
| 182 | +} |
| 183 | + |
| 184 | +#define FADE(name, type) \ |
| 185 | +static void fade_samples_## name (uint8_t **dst, uint8_t * const *src, \ |
| 186 | + int nb_samples, int channels, int dir, \ |
| 187 | + int64_t start, int range, int curve) \ |
| 188 | +{ \ |
| 189 | + type *d = (type *)dst[0]; \ |
| 190 | + const type *s = (type *)src[0]; \ |
| 191 | + int i, c, k = 0; \ |
| 192 | + \ |
| 193 | + for (i = 0; i < nb_samples; i++) { \ |
| 194 | + double gain = fade_gain(curve, start + i * dir, range); \ |
| 195 | + for (c = 0; c < channels; c++, k++) \ |
| 196 | + d[k] = s[k] * gain; \ |
| 197 | + } \ |
| 198 | +} |
| 199 | + |
| 200 | +FADE_PLANAR(dbl, double) |
| 201 | +FADE_PLANAR(flt, float) |
| 202 | +FADE_PLANAR(s16, int16_t) |
| 203 | +FADE_PLANAR(s32, int32_t) |
| 204 | + |
| 205 | +FADE(dbl, double) |
| 206 | +FADE(flt, float) |
| 207 | +FADE(s16, int16_t) |
| 208 | +FADE(s32, int32_t) |
| 209 | + |
| 210 | +static int config_output(AVFilterLink *outlink) |
| 211 | +{ |
| 212 | + AVFilterContext *ctx = outlink->src; |
| 213 | + AudioFadeContext *afade = ctx->priv; |
| 214 | + AVFilterLink *inlink = ctx->inputs[0]; |
| 215 | + |
| 216 | + switch (inlink->format) { |
| 217 | + case AV_SAMPLE_FMT_DBL: afade->fade_samples = fade_samples_dbl; break; |
| 218 | + case AV_SAMPLE_FMT_DBLP: afade->fade_samples = fade_samples_dblp; break; |
| 219 | + case AV_SAMPLE_FMT_FLT: afade->fade_samples = fade_samples_flt; break; |
| 220 | + case AV_SAMPLE_FMT_FLTP: afade->fade_samples = fade_samples_fltp; break; |
| 221 | + case AV_SAMPLE_FMT_S16: afade->fade_samples = fade_samples_s16; break; |
| 222 | + case AV_SAMPLE_FMT_S16P: afade->fade_samples = fade_samples_s16p; break; |
| 223 | + case AV_SAMPLE_FMT_S32: afade->fade_samples = fade_samples_s32; break; |
| 224 | + case AV_SAMPLE_FMT_S32P: afade->fade_samples = fade_samples_s32p; break; |
| 225 | + } |
| 226 | + |
| 227 | + if (afade->duration) |
| 228 | + afade->nb_samples = afade->duration * inlink->sample_rate; |
| 229 | + if (afade->start_time) |
| 230 | + afade->start_sample = afade->start_time * inlink->sample_rate; |
| 231 | + |
| 232 | + return 0; |
| 233 | +} |
| 234 | + |
| 235 | +static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *buf) |
| 236 | +{ |
| 237 | + AudioFadeContext *afade = inlink->dst->priv; |
| 238 | + AVFilterLink *outlink = inlink->dst->outputs[0]; |
| 239 | + int nb_samples = buf->audio->nb_samples; |
| 240 | + AVFilterBufferRef *out_buf; |
| 241 | + int64_t cur_sample = av_rescale_q(buf->pts, (AVRational){1, outlink->sample_rate}, outlink->time_base); |
| 242 | + |
| 243 | + if ((!afade->type && (afade->start_sample + afade->nb_samples < cur_sample)) || |
| 244 | + ( afade->type && (cur_sample + afade->nb_samples < afade->start_sample))) |
| 245 | + return ff_filter_frame(outlink, buf); |
| 246 | + |
| 247 | + if (buf->perms & AV_PERM_WRITE) { |
| 248 | + out_buf = buf; |
| 249 | + } else { |
| 250 | + out_buf = ff_get_audio_buffer(inlink, AV_PERM_WRITE, nb_samples); |
| 251 | + if (!out_buf) |
| 252 | + return AVERROR(ENOMEM); |
| 253 | + out_buf->pts = buf->pts; |
| 254 | + } |
| 255 | + |
| 256 | + if ((!afade->type && (cur_sample + nb_samples < afade->start_sample)) || |
| 257 | + ( afade->type && (afade->start_sample + afade->nb_samples < cur_sample))) { |
| 258 | + av_samples_set_silence(out_buf->extended_data, 0, nb_samples, |
| 259 | + out_buf->audio->channels, out_buf->format); |
| 260 | + } else { |
| 261 | + int64_t start; |
| 262 | + |
| 263 | + if (!afade->type) |
| 264 | + start = cur_sample - afade->start_sample; |
| 265 | + else |
| 266 | + start = afade->start_sample + afade->nb_samples - cur_sample; |
| 267 | + |
| 268 | + afade->fade_samples(out_buf->extended_data, buf->extended_data, |
| 269 | + nb_samples, buf->audio->channels, |
| 270 | + afade->type ? -1 : 1, start, |
| 271 | + afade->nb_samples, afade->curve); |
| 272 | + } |
| 273 | + |
| 274 | + if (buf != out_buf) |
| 275 | + avfilter_unref_buffer(buf); |
| 276 | + |
| 277 | + return ff_filter_frame(outlink, out_buf); |
| 278 | +} |
| 279 | + |
| 280 | +static const AVFilterPad avfilter_af_afade_inputs[] = { |
| 281 | + { |
| 282 | + .name = "default", |
| 283 | + .type = AVMEDIA_TYPE_AUDIO, |
| 284 | + .filter_frame = filter_frame, |
| 285 | + }, |
| 286 | + { NULL } |
| 287 | +}; |
| 288 | + |
| 289 | +static const AVFilterPad avfilter_af_afade_outputs[] = { |
| 290 | + { |
| 291 | + .name = "default", |
| 292 | + .type = AVMEDIA_TYPE_AUDIO, |
| 293 | + .config_props = config_output, |
| 294 | + }, |
| 295 | + { NULL } |
| 296 | +}; |
| 297 | + |
| 298 | +AVFilter avfilter_af_afade = { |
| 299 | + .name = "afade", |
| 300 | + .description = NULL_IF_CONFIG_SMALL("Fade in/out input audio."), |
| 301 | + .query_formats = query_formats, |
| 302 | + .priv_size = sizeof(AudioFadeContext), |
| 303 | + .init = init, |
| 304 | + .inputs = avfilter_af_afade_inputs, |
| 305 | + .outputs = avfilter_af_afade_outputs, |
| 306 | + .priv_class = &afade_class, |
| 307 | +}; |