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/* |
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* Copyright (c) 2000 Chris Ausbrooks <weed@bucket.pp.ualr.edu> |
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* Copyright (c) 2000 Fabien COELHO <fabien@coelho.net> |
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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/opt.h" |
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#include "libavutil/samplefmt.h" |
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#include "avfilter.h" |
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#include "audio.h" |
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#include "internal.h" |
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typedef struct DCShiftContext { |
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const AVClass *class; |
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double dcshift; |
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double limiterthreshold; |
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double limitergain; |
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} DCShiftContext; |
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#define OFFSET(x) offsetof(DCShiftContext, x) |
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#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
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static const AVOption dcshift_options[] = { |
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{ "shift", "set DC shift", OFFSET(dcshift), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A }, |
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{ "limitergain", "set limiter gain", OFFSET(limitergain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, A }, |
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{ NULL } |
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}; |
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AVFILTER_DEFINE_CLASS(dcshift); |
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static av_cold int init(AVFilterContext *ctx) |
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{ |
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DCShiftContext *s = ctx->priv; |
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s->limiterthreshold = INT32_MAX * (1.0 - (fabs(s->dcshift) - s->limitergain)); |
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return 0; |
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} |
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static int query_formats(AVFilterContext *ctx) |
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{ |
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AVFilterChannelLayouts *layouts; |
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AVFilterFormats *formats; |
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static const enum AVSampleFormat sample_fmts[] = { |
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AV_SAMPLE_FMT_S32P, AV_SAMPLE_FMT_NONE |
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}; |
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int ret; |
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layouts = ff_all_channel_counts(); |
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✗✓ |
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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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✗✓ |
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if (ret < 0) |
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return ret; |
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formats = ff_make_format_list(sample_fmts); |
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✗✓ |
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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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✗✓ |
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if (ret < 0) |
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return ret; |
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formats = ff_all_samplerates(); |
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✗✓ |
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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 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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AVFrame *out; |
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DCShiftContext *s = ctx->priv; |
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int i, j; |
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double dcshift = s->dcshift; |
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✓✗ |
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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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✓✗ |
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if (s->limitergain > 0) { |
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✓✓ |
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for (i = 0; i < inlink->channels; i++) { |
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const int32_t *src = (int32_t *)in->extended_data[i]; |
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int32_t *dst = (int32_t *)out->extended_data[i]; |
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✓✓ |
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for (j = 0; j < in->nb_samples; j++) { |
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double d; |
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d = src[j]; |
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✗✓✗✗
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if (d > s->limiterthreshold && dcshift > 0) { |
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d = (d - s->limiterthreshold) * s->limitergain / |
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(INT32_MAX - s->limiterthreshold) + |
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s->limiterthreshold + dcshift; |
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✗✓✗✗
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} else if (d < -s->limiterthreshold && dcshift < 0) { |
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d = (d + s->limiterthreshold) * s->limitergain / |
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(INT32_MAX - s->limiterthreshold) - |
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s->limiterthreshold + dcshift; |
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} else { |
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d = dcshift * INT32_MAX + d; |
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} |
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dst[j] = av_clipl_int32(d); |
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} |
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} |
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} else { |
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for (i = 0; i < inlink->channels; i++) { |
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const int32_t *src = (int32_t *)in->extended_data[i]; |
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int32_t *dst = (int32_t *)out->extended_data[i]; |
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for (j = 0; j < in->nb_samples; j++) { |
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double d = dcshift * (INT32_MAX + 1.) + src[j]; |
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dst[j] = av_clipl_int32(d); |
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} |
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} |
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} |
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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 const AVFilterPad dcshift_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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}, |
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{ NULL } |
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}; |
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static const AVFilterPad dcshift_outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_AUDIO, |
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}, |
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{ NULL } |
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}; |
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AVFilter ff_af_dcshift = { |
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.name = "dcshift", |
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.description = NULL_IF_CONFIG_SMALL("Apply a DC shift to the audio."), |
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.query_formats = query_formats, |
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.priv_size = sizeof(DCShiftContext), |
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.priv_class = &dcshift_class, |
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.init = init, |
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.inputs = dcshift_inputs, |
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.outputs = dcshift_outputs, |
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
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}; |