| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2000 Chris Ausbrooks <weed@bucket.pp.ualr.edu> | ||
| 3 | * Copyright (c) 2000 Fabien COELHO <fabien@coelho.net> | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "libavutil/opt.h" | ||
| 23 | #include "libavutil/samplefmt.h" | ||
| 24 | #include "avfilter.h" | ||
| 25 | #include "audio.h" | ||
| 26 | #include "filters.h" | ||
| 27 | |||
| 28 | typedef struct DCShiftContext { | ||
| 29 | const AVClass *class; | ||
| 30 | double dcshift; | ||
| 31 | double limiterthreshold; | ||
| 32 | double limitergain; | ||
| 33 | } DCShiftContext; | ||
| 34 | |||
| 35 | #define OFFSET(x) offsetof(DCShiftContext, x) | ||
| 36 | #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | ||
| 37 | |||
| 38 | static const AVOption dcshift_options[] = { | ||
| 39 | { "shift", "set DC shift", OFFSET(dcshift), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, A }, | ||
| 40 | { "limitergain", "set limiter gain", OFFSET(limitergain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, A }, | ||
| 41 | { NULL } | ||
| 42 | }; | ||
| 43 | |||
| 44 | AVFILTER_DEFINE_CLASS(dcshift); | ||
| 45 | |||
| 46 | 2 | static av_cold int init(AVFilterContext *ctx) | |
| 47 | { | ||
| 48 | 2 | DCShiftContext *s = ctx->priv; | |
| 49 | |||
| 50 | 2 | s->limiterthreshold = INT32_MAX * (1.0 - (fabs(s->dcshift) - s->limitergain)); | |
| 51 | |||
| 52 | 2 | return 0; | |
| 53 | } | ||
| 54 | |||
| 55 | 20 | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
| 56 | { | ||
| 57 | 20 | AVFilterContext *ctx = inlink->dst; | |
| 58 | 20 | AVFilterLink *outlink = ctx->outputs[0]; | |
| 59 | AVFrame *out; | ||
| 60 | 20 | DCShiftContext *s = ctx->priv; | |
| 61 | int i, j; | ||
| 62 | 20 | double dcshift = s->dcshift; | |
| 63 | |||
| 64 |
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20 | if (av_frame_is_writable(in)) { |
| 65 | 20 | out = in; | |
| 66 | } else { | ||
| 67 | ✗ | out = ff_get_audio_buffer(outlink, in->nb_samples); | |
| 68 | ✗ | if (!out) { | |
| 69 | ✗ | av_frame_free(&in); | |
| 70 | ✗ | return AVERROR(ENOMEM); | |
| 71 | } | ||
| 72 | ✗ | av_frame_copy_props(out, in); | |
| 73 | } | ||
| 74 | |||
| 75 |
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20 | if (s->limitergain > 0) { |
| 76 |
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60 | for (i = 0; i < inlink->ch_layout.nb_channels; i++) { |
| 77 | 40 | const int32_t *src = (int32_t *)in->extended_data[i]; | |
| 78 | 40 | int32_t *dst = (int32_t *)out->extended_data[i]; | |
| 79 | |||
| 80 |
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163880 | for (j = 0; j < in->nb_samples; j++) { |
| 81 | double d; | ||
| 82 | |||
| 83 | 163840 | d = src[j]; | |
| 84 | |||
| 85 |
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163840 | if (d > s->limiterthreshold && dcshift > 0) { |
| 86 | ✗ | d = (d - s->limiterthreshold) * s->limitergain / | |
| 87 | ✗ | (INT32_MAX - s->limiterthreshold) + | |
| 88 | ✗ | s->limiterthreshold + dcshift; | |
| 89 |
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163840 | } else if (d < -s->limiterthreshold && dcshift < 0) { |
| 90 | ✗ | d = (d + s->limiterthreshold) * s->limitergain / | |
| 91 | ✗ | (INT32_MAX - s->limiterthreshold) - | |
| 92 | ✗ | s->limiterthreshold + dcshift; | |
| 93 | } else { | ||
| 94 | 163840 | d = dcshift * INT32_MAX + d; | |
| 95 | } | ||
| 96 | |||
| 97 | 163840 | dst[j] = av_clipl_int32(d); | |
| 98 | } | ||
| 99 | } | ||
| 100 | } else { | ||
| 101 | ✗ | for (i = 0; i < inlink->ch_layout.nb_channels; i++) { | |
| 102 | ✗ | const int32_t *src = (int32_t *)in->extended_data[i]; | |
| 103 | ✗ | int32_t *dst = (int32_t *)out->extended_data[i]; | |
| 104 | |||
| 105 | ✗ | for (j = 0; j < in->nb_samples; j++) { | |
| 106 | ✗ | double d = dcshift * (INT32_MAX + 1.) + src[j]; | |
| 107 | |||
| 108 | ✗ | dst[j] = av_clipl_int32(d); | |
| 109 | } | ||
| 110 | } | ||
| 111 | } | ||
| 112 | |||
| 113 |
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20 | if (out != in) |
| 114 | ✗ | av_frame_free(&in); | |
| 115 | 20 | return ff_filter_frame(outlink, out); | |
| 116 | } | ||
| 117 | static const AVFilterPad dcshift_inputs[] = { | ||
| 118 | { | ||
| 119 | .name = "default", | ||
| 120 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 121 | .filter_frame = filter_frame, | ||
| 122 | }, | ||
| 123 | }; | ||
| 124 | |||
| 125 | const AVFilter ff_af_dcshift = { | ||
| 126 | .name = "dcshift", | ||
| 127 | .description = NULL_IF_CONFIG_SMALL("Apply a DC shift to the audio."), | ||
| 128 | .priv_size = sizeof(DCShiftContext), | ||
| 129 | .priv_class = &dcshift_class, | ||
| 130 | .init = init, | ||
| 131 | FILTER_INPUTS(dcshift_inputs), | ||
| 132 | FILTER_OUTPUTS(ff_audio_default_filterpad), | ||
| 133 | FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_S32P), | ||
| 134 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, | ||
| 135 | }; | ||
| 136 |