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175 lines
5.1 KiB
175 lines
5.1 KiB
/* |
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* Copyright (C) 2012 VLC authors and VideoLAN |
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* Author : Sukrit Sangwan < sukritsangwan at gmail dot com > |
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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/mem.h" |
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#include "libavutil/opt.h" |
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#include "avfilter.h" |
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#include "audio.h" |
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#include "filters.h" |
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#include "formats.h" |
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typedef struct StereoWidenContext { |
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const AVClass *class; |
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float delay; |
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float feedback; |
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float crossfeed; |
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float drymix; |
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float *buffer; |
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float *cur; |
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int length; |
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} StereoWidenContext; |
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#define OFFSET(x) offsetof(StereoWidenContext, x) |
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#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
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#define AT AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM |
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static const AVOption stereowiden_options[] = { |
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{ "delay", "set delay time", OFFSET(delay), AV_OPT_TYPE_FLOAT, {.dbl=20}, 1, 100, A }, |
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{ "feedback", "set feedback gain", OFFSET(feedback), AV_OPT_TYPE_FLOAT, {.dbl=.3}, 0, 0.9, AT }, |
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{ "crossfeed", "set cross feed", OFFSET(crossfeed), AV_OPT_TYPE_FLOAT, {.dbl=.3}, 0, 0.8, AT }, |
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{ "drymix", "set dry-mix", OFFSET(drymix), AV_OPT_TYPE_FLOAT, {.dbl=.8}, 0, 1.0, AT }, |
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{ NULL } |
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}; |
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AVFILTER_DEFINE_CLASS(stereowiden); |
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static int query_formats(const AVFilterContext *ctx, |
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AVFilterFormatsConfig **cfg_in, |
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AVFilterFormatsConfig **cfg_out) |
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{ |
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static const enum AVSampleFormat formats[] = { |
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AV_SAMPLE_FMT_FLT, |
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AV_SAMPLE_FMT_NONE, |
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}; |
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static const AVChannelLayout layouts[] = { |
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AV_CHANNEL_LAYOUT_STEREO, |
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{ .nb_channels = 0 }, |
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}; |
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int ret; |
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ret = ff_set_common_formats_from_list2(ctx, cfg_in, cfg_out, formats); |
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if (ret < 0) |
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return ret; |
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ret = ff_set_common_channel_layouts_from_list2(ctx, cfg_in, cfg_out, layouts); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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static int config_input(AVFilterLink *inlink) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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StereoWidenContext *s = ctx->priv; |
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s->length = lrintf(s->delay * inlink->sample_rate / 1000); |
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s->length *= 2; |
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if (s->length == 0) |
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return AVERROR(EINVAL); |
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s->buffer = av_calloc(s->length, sizeof(*s->buffer)); |
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if (!s->buffer) |
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return AVERROR(ENOMEM); |
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s->cur = s->buffer; |
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return 0; |
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} |
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static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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StereoWidenContext *s = ctx->priv; |
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const float *src = (const float *)in->data[0]; |
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const float drymix = s->drymix; |
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const float crossfeed = s->crossfeed; |
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const float feedback = s->feedback; |
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AVFrame *out; |
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float *dst; |
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int n; |
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if (av_frame_is_writable(in)) { |
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out = in; |
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} else { |
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out = ff_get_audio_buffer(outlink, in->nb_samples); |
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if (!out) { |
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av_frame_free(&in); |
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return AVERROR(ENOMEM); |
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} |
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av_frame_copy_props(out, in); |
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} |
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dst = (float *)out->data[0]; |
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for (n = 0; n < in->nb_samples; n++, src += 2, dst += 2, s->cur += 2) { |
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const float left = src[0], right = src[1]; |
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if (s->cur == s->buffer + s->length) |
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s->cur = s->buffer; |
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if (ctx->is_disabled) { |
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dst[0] = left; |
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dst[1] = right; |
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} else { |
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dst[0] = drymix * left - crossfeed * right - feedback * s->cur[1]; |
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dst[1] = drymix * right - crossfeed * left - feedback * s->cur[0]; |
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} |
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s->cur[0] = left; |
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s->cur[1] = right; |
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} |
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if (out != in) |
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av_frame_free(&in); |
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return ff_filter_frame(outlink, out); |
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} |
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static av_cold void uninit(AVFilterContext *ctx) |
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{ |
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StereoWidenContext *s = ctx->priv; |
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av_freep(&s->buffer); |
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} |
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static const AVFilterPad inputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.filter_frame = filter_frame, |
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.config_props = config_input, |
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}, |
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}; |
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const AVFilter ff_af_stereowiden = { |
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.name = "stereowiden", |
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.description = NULL_IF_CONFIG_SMALL("Apply stereo widening effect."), |
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.priv_size = sizeof(StereoWidenContext), |
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.priv_class = &stereowiden_class, |
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.uninit = uninit, |
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FILTER_INPUTS(inputs), |
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FILTER_OUTPUTS(ff_audio_default_filterpad), |
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FILTER_QUERY_FUNC2(query_formats), |
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, |
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.process_command = ff_filter_process_command, |
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};
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