mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Kyle Swanson <k@ylo.ph> Signed-off-by: Paul B Mahol <onemda@gmail.com>pull/160/head
Kyle Swanson
9 years ago
committed by
Paul B Mahol
parent
955cdc43a3
commit
6a11c7f160
6 changed files with 252 additions and 2 deletions
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/*
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* Copyright (c) 2015 Kyle Swanson <k@ylo.ph>. |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public License |
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* as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/opt.h" |
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#include "audio.h" |
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#include "avfilter.h" |
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#include "internal.h" |
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#include "libavutil/lfg.h" |
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#include "libavutil/random_seed.h" |
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typedef struct { |
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const AVClass *class; |
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int sample_rate; |
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double amplitude; |
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int64_t duration; |
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int64_t color; |
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int64_t seed; |
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int nb_samples; |
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int64_t pts; |
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int infinite; |
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double (*filter)(double white, double *buf); |
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double buf[7]; |
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AVLFG c; |
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} ANoiseSrcContext; |
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#define OFFSET(x) offsetof(ANoiseSrcContext, x) |
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
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static const AVOption anoisesrc_options[] = { |
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{ "sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 15, INT_MAX, FLAGS }, |
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{ "r", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 15, INT_MAX, FLAGS }, |
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{ "amplitude", "set amplitude", OFFSET(amplitude), AV_OPT_TYPE_DOUBLE, {.dbl = 1.}, 0., 1., FLAGS }, |
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{ "a", "set amplitude", OFFSET(amplitude), AV_OPT_TYPE_DOUBLE, {.dbl = 1.}, 0., 1., FLAGS }, |
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{ "duration", "set duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, FLAGS }, |
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{ "d", "set duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, FLAGS }, |
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{ "color", "set noise color", OFFSET(color), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 2, FLAGS, "color" }, |
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{ "colour", "set noise color", OFFSET(color), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 2, FLAGS, "color" }, |
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{ "c", "set noise color", OFFSET(color), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 2, FLAGS, "color" }, |
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{ "white", 0, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, FLAGS, "color" }, |
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{ "pink", 0, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, FLAGS, "color" }, |
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{ "brown", 0, 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 0, FLAGS, "color" }, |
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{ "seed", "set random seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT_MAX, FLAGS }, |
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{ "s", "set random seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT_MAX, FLAGS }, |
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{ "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS }, |
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{ "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS }, |
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{NULL} |
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}; |
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AVFILTER_DEFINE_CLASS(anoisesrc); |
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static av_cold int query_formats(AVFilterContext *ctx) |
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{ |
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ANoiseSrcContext *s = ctx->priv; |
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static const int64_t chlayouts[] = { AV_CH_LAYOUT_MONO, -1 }; |
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int sample_rates[] = { s->sample_rate, -1 }; |
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static const enum AVSampleFormat sample_fmts[] = { |
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AV_SAMPLE_FMT_DBL, |
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AV_SAMPLE_FMT_NONE |
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}; |
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AVFilterFormats *formats; |
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AVFilterChannelLayouts *layouts; |
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int ret; |
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formats = ff_make_format_list(sample_fmts); |
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if (!formats) |
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return AVERROR(ENOMEM); |
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ret = ff_set_common_formats (ctx, formats); |
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if (ret < 0) |
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return ret; |
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layouts = avfilter_make_format64_list(chlayouts); |
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if (!layouts) |
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return AVERROR(ENOMEM); |
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ret = ff_set_common_channel_layouts(ctx, layouts); |
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if (ret < 0) |
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return ret; |
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formats = ff_make_format_list(sample_rates); |
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if (!formats) |
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return AVERROR(ENOMEM); |
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return ff_set_common_samplerates(ctx, formats); |
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} |
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static double white_filter(double white, double *buf) |
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{ |
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return white; |
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}; |
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static double pink_filter(double white, double *buf) |
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{ |
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double pink; |
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/* http://www.musicdsp.org/files/pink.txt */ |
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buf[0] = 0.99886 * buf[0] + white * 0.0555179; |
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buf[1] = 0.99332 * buf[1] + white * 0.0750759; |
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buf[2] = 0.96900 * buf[2] + white * 0.1538520; |
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buf[3] = 0.86650 * buf[3] + white * 0.3104856; |
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buf[4] = 0.55000 * buf[4] + white * 0.5329522; |
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buf[5] = -0.7616 * buf[5] - white * 0.0168980; |
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pink = buf[0] + buf[1] + buf[2] + buf[3] + buf[4] + buf[5] + buf[6] + white * 0.5362; |
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buf[6] = white * 0.115926; |
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return pink * 0.11; |
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} |
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static double brown_filter(double white, double *buf) |
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{ |
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double brown; |
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brown = ((0.02 * white) + buf[0]) / 1.02; |
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buf[0] = brown; |
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return brown * 3.5; |
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} |
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static av_cold int config_props(AVFilterLink *outlink) |
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{ |
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AVFilterContext *ctx = outlink->src; |
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ANoiseSrcContext *s = ctx->priv; |
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if (s->seed == -1) |
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s->seed = av_get_random_seed(); |
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av_lfg_init(&s->c, s->seed); |
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if (s->duration == 0) |
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s->infinite = 1; |
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s->duration = av_rescale(s->duration, s->sample_rate, AV_TIME_BASE); |
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switch (s->color) { |
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case 0: s->filter = white_filter; break; |
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case 1: s->filter = pink_filter; break; |
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case 2: s->filter = brown_filter; break; |
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} |
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return 0; |
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} |
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static int request_frame(AVFilterLink *outlink) |
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{ |
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AVFilterContext *ctx = outlink->src; |
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ANoiseSrcContext *s = ctx->priv; |
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AVFrame *frame; |
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int nb_samples, i; |
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double *dst; |
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if (!s->infinite && s->duration <= 0) { |
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return AVERROR_EOF; |
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} else if (!s->infinite && s->duration < s->nb_samples) { |
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nb_samples = s->duration; |
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} else { |
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nb_samples = s->nb_samples; |
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} |
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if (!(frame = ff_get_audio_buffer(outlink, nb_samples))) |
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return AVERROR(ENOMEM); |
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dst = (double *)frame->data[0]; |
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for (i = 0; i < nb_samples; i++) { |
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double white; |
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white = s->amplitude * ((2 * ((double) av_lfg_get(&s->c) / 0xffffffff)) - 1); |
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dst[i] = s->filter(white, s->buf); |
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} |
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if (!s->infinite) |
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s->duration -= nb_samples; |
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frame->pts = s->pts; |
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s->pts += nb_samples; |
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return ff_filter_frame(outlink, frame); |
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} |
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static const AVFilterPad anoisesrc_outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.request_frame = request_frame, |
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.config_props = config_props, |
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}, |
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{ NULL } |
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}; |
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AVFilter ff_asrc_anoisesrc = { |
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.name = "anoisesrc", |
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.description = NULL_IF_CONFIG_SMALL("Generate a noise audio signal."), |
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.query_formats = query_formats, |
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.priv_size = sizeof(ANoiseSrcContext), |
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.inputs = NULL, |
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.outputs = anoisesrc_outputs, |
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.priv_class = &anoisesrc_class, |
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}; |
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