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https://github.com/FFmpeg/FFmpeg.git
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790f793844
There are lots of files that don't need it: The number of object files that actually need it went down from 2011 to 884 here. Keep it for external users in order to not cause breakages. Also improve the other headers a bit while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
152 lines
5.3 KiB
C
152 lines
5.3 KiB
C
/*
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* Copyright (c) 2023 Paul B Mahol
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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
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* License 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 GNU
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* 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
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/channel_layout.h"
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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 "filters.h"
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#include "formats.h"
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#include "internal.h"
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typedef struct AFDelaySrcContext {
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const AVClass *class;
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double delay;
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int sample_rate;
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int nb_samples;
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int nb_taps;
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AVChannelLayout chlayout;
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int64_t pts;
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} AFDelaySrcContext;
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static float sincf(float x)
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{
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if (x == 0.f)
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return 1.f;
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return sinf(M_PI * x) / (M_PI * x);
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}
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static int activate(AVFilterContext *ctx)
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{
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AVFilterLink *outlink = ctx->outputs[0];
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AFDelaySrcContext *s = ctx->priv;
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AVFrame *frame = NULL;
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int nb_samples;
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float *dst;
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if (!ff_outlink_frame_wanted(outlink))
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return FFERROR_NOT_READY;
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nb_samples = FFMIN(s->nb_samples, s->nb_taps - s->pts);
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if (nb_samples <= 0) {
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ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
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return 0;
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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 = (float *)frame->extended_data[0];
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for (int n = 0; n < nb_samples; n++) {
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float x = s->pts + n;
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dst[n] = sincf(x - s->delay) * cosf(M_PI * (x - s->delay) / s->nb_taps) / sincf((x - s->delay) / s->nb_taps);
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}
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for (int ch = 1; ch < frame->ch_layout.nb_channels; ch++)
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memcpy(frame->extended_data[ch], dst, sizeof(*dst) * 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 int query_formats(AVFilterContext *ctx)
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{
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AFDelaySrcContext *s = ctx->priv;
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AVChannelLayout chlayouts[] = { s->chlayout, { 0 } };
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int sample_rates[] = { s->sample_rate, -1 };
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static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP,
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AV_SAMPLE_FMT_NONE };
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int ret = ff_set_common_formats_from_list(ctx, sample_fmts);
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if (ret < 0)
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return ret;
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ret = ff_set_common_channel_layouts_from_list(ctx, chlayouts);
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if (ret < 0)
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return ret;
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return ff_set_common_samplerates_from_list(ctx, sample_rates);
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AFDelaySrcContext *s = ctx->priv;
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outlink->sample_rate = s->sample_rate;
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s->pts = 0;
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if (s->nb_taps <= 0)
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s->nb_taps = s->delay * 8 + 1;
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return 0;
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}
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static const AVFilterPad afdelaysrc_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.config_props = config_output,
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},
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};
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#define AF AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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#define OFFSET(x) offsetof(AFDelaySrcContext, x)
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static const AVOption afdelaysrc_options[] = {
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{ "delay", "set fractional delay", OFFSET(delay), AV_OPT_TYPE_DOUBLE,{.dbl=0}, 0, INT16_MAX, AF },
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{ "d", "set fractional delay", OFFSET(delay), AV_OPT_TYPE_DOUBLE,{.dbl=0}, 0, INT16_MAX, AF },
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{ "sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT_MAX, AF },
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{ "r", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT_MAX, AF },
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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, AF },
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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, AF },
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{ "taps", "set number of taps for delay filter", OFFSET(nb_taps), AV_OPT_TYPE_INT, {.i64=0}, 0, 32768, AF },
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{ "t", "set number of taps for delay filter", OFFSET(nb_taps), AV_OPT_TYPE_INT, {.i64=0}, 0, 32768, AF },
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{ "channel_layout", "set channel layout", OFFSET(chlayout), AV_OPT_TYPE_CHLAYOUT,{.str="stereo"},0, 0, AF },
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{ "c", "set channel layout", OFFSET(chlayout), AV_OPT_TYPE_CHLAYOUT,{.str="stereo"},0, 0, AF },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(afdelaysrc);
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const AVFilter ff_asrc_afdelaysrc = {
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.name = "afdelaysrc",
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.description = NULL_IF_CONFIG_SMALL("Generate a Fractional delay FIR coefficients."),
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.priv_size = sizeof(AFDelaySrcContext),
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.priv_class = &afdelaysrc_class,
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.activate = activate,
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.inputs = NULL,
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FILTER_OUTPUTS(afdelaysrc_outputs),
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FILTER_QUERY_FUNC(query_formats),
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};
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