| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2018 Paul B Mahol | ||
| 3 | * | ||
| 4 | * This file is part of FFmpeg. | ||
| 5 | * | ||
| 6 | * FFmpeg is free software; you can redistribute it and/or | ||
| 7 | * modify it under the terms of the GNU Lesser General Public License | ||
| 8 | * as published by the Free Software Foundation; either | ||
| 9 | * version 2.1 of the License, or (at your option) any later version. | ||
| 10 | * | ||
| 11 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 14 | * GNU Lesser General Public License for more details. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU Lesser General Public License | ||
| 17 | * along with FFmpeg; if not, write to the Free Software Foundation, Inc., | ||
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | #include "libavutil/channel_layout.h" | ||
| 22 | #include "libavutil/mem.h" | ||
| 23 | #include "libavutil/opt.h" | ||
| 24 | #include "audio.h" | ||
| 25 | #include "avfilter.h" | ||
| 26 | #include "formats.h" | ||
| 27 | #include "filters.h" | ||
| 28 | #include "window_func.h" | ||
| 29 | |||
| 30 | typedef struct HilbertContext { | ||
| 31 | const AVClass *class; | ||
| 32 | |||
| 33 | int sample_rate; | ||
| 34 | int nb_taps; | ||
| 35 | int nb_samples; | ||
| 36 | int win_func; | ||
| 37 | |||
| 38 | float *taps; | ||
| 39 | int64_t pts; | ||
| 40 | } HilbertContext; | ||
| 41 | |||
| 42 | #define OFFSET(x) offsetof(HilbertContext, x) | ||
| 43 | #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | ||
| 44 | |||
| 45 | static const AVOption hilbert_options[] = { | ||
| 46 | { "sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT_MAX, FLAGS }, | ||
| 47 | { "r", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT_MAX, FLAGS }, | ||
| 48 | { "taps", "set number of taps", OFFSET(nb_taps), AV_OPT_TYPE_INT, {.i64=22051}, 11, UINT16_MAX, FLAGS }, | ||
| 49 | { "t", "set number of taps", OFFSET(nb_taps), AV_OPT_TYPE_INT, {.i64=22051}, 11, UINT16_MAX, FLAGS }, | ||
| 50 | { "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS }, | ||
| 51 | { "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, FLAGS }, | ||
| 52 | WIN_FUNC_OPTION("win_func", OFFSET(win_func), FLAGS, WFUNC_BLACKMAN), | ||
| 53 | WIN_FUNC_OPTION("w", OFFSET(win_func), FLAGS, WFUNC_BLACKMAN), | ||
| 54 | {NULL} | ||
| 55 | }; | ||
| 56 | |||
| 57 | AVFILTER_DEFINE_CLASS(hilbert); | ||
| 58 | |||
| 59 | ✗ | static av_cold int init(AVFilterContext *ctx) | |
| 60 | { | ||
| 61 | ✗ | HilbertContext *s = ctx->priv; | |
| 62 | |||
| 63 | ✗ | if (!(s->nb_taps & 1)) { | |
| 64 | ✗ | av_log(s, AV_LOG_ERROR, "Number of taps %d must be odd length.\n", s->nb_taps); | |
| 65 | ✗ | return AVERROR(EINVAL); | |
| 66 | } | ||
| 67 | |||
| 68 | ✗ | return 0; | |
| 69 | } | ||
| 70 | |||
| 71 | ✗ | static av_cold void uninit(AVFilterContext *ctx) | |
| 72 | { | ||
| 73 | ✗ | HilbertContext *s = ctx->priv; | |
| 74 | |||
| 75 | ✗ | av_freep(&s->taps); | |
| 76 | ✗ | } | |
| 77 | |||
| 78 | ✗ | static av_cold int query_formats(const AVFilterContext *ctx, | |
| 79 | AVFilterFormatsConfig **cfg_in, | ||
| 80 | AVFilterFormatsConfig **cfg_out) | ||
| 81 | { | ||
| 82 | ✗ | HilbertContext *s = ctx->priv; | |
| 83 | static const AVChannelLayout chlayouts[] = { AV_CHANNEL_LAYOUT_MONO, { 0 } }; | ||
| 84 | ✗ | int sample_rates[] = { s->sample_rate, -1 }; | |
| 85 | static const enum AVSampleFormat sample_fmts[] = { | ||
| 86 | AV_SAMPLE_FMT_FLT, | ||
| 87 | AV_SAMPLE_FMT_NONE | ||
| 88 | }; | ||
| 89 | ✗ | int ret = ff_set_common_formats_from_list2(ctx, cfg_in, cfg_out, sample_fmts); | |
| 90 | ✗ | if (ret < 0) | |
| 91 | ✗ | return ret; | |
| 92 | |||
| 93 | ✗ | ret = ff_set_common_channel_layouts_from_list2(ctx, cfg_in, cfg_out, chlayouts); | |
| 94 | ✗ | if (ret < 0) | |
| 95 | ✗ | return ret; | |
| 96 | |||
| 97 | ✗ | return ff_set_common_samplerates_from_list2(ctx, cfg_in, cfg_out, sample_rates); | |
| 98 | } | ||
| 99 | |||
| 100 | ✗ | static av_cold int config_props(AVFilterLink *outlink) | |
| 101 | { | ||
| 102 | ✗ | AVFilterContext *ctx = outlink->src; | |
| 103 | ✗ | HilbertContext *s = ctx->priv; | |
| 104 | float overlap; | ||
| 105 | int i; | ||
| 106 | |||
| 107 | ✗ | s->taps = av_malloc_array(s->nb_taps, sizeof(*s->taps)); | |
| 108 | ✗ | if (!s->taps) | |
| 109 | ✗ | return AVERROR(ENOMEM); | |
| 110 | |||
| 111 | ✗ | generate_window_func(s->taps, s->nb_taps, s->win_func, &overlap); | |
| 112 | |||
| 113 | ✗ | for (i = 0; i < s->nb_taps; i++) { | |
| 114 | ✗ | int k = -(s->nb_taps / 2) + i; | |
| 115 | |||
| 116 | ✗ | if (k & 1) { | |
| 117 | ✗ | float pk = M_PI * k; | |
| 118 | |||
| 119 | ✗ | s->taps[i] *= (1.f - cosf(pk)) / pk; | |
| 120 | } else { | ||
| 121 | ✗ | s->taps[i] = 0.f; | |
| 122 | } | ||
| 123 | } | ||
| 124 | |||
| 125 | ✗ | s->pts = 0; | |
| 126 | |||
| 127 | ✗ | return 0; | |
| 128 | } | ||
| 129 | |||
| 130 | ✗ | static int activate(AVFilterContext *ctx) | |
| 131 | { | ||
| 132 | ✗ | AVFilterLink *outlink = ctx->outputs[0]; | |
| 133 | ✗ | HilbertContext *s = ctx->priv; | |
| 134 | AVFrame *frame; | ||
| 135 | int nb_samples; | ||
| 136 | |||
| 137 | ✗ | if (!ff_outlink_frame_wanted(outlink)) | |
| 138 | ✗ | return FFERROR_NOT_READY; | |
| 139 | |||
| 140 | ✗ | nb_samples = FFMIN(s->nb_samples, s->nb_taps - s->pts); | |
| 141 | ✗ | if (nb_samples <= 0) { | |
| 142 | ✗ | ff_outlink_set_status(outlink, AVERROR_EOF, s->pts); | |
| 143 | ✗ | return 0; | |
| 144 | } | ||
| 145 | |||
| 146 | ✗ | if (!(frame = ff_get_audio_buffer(outlink, nb_samples))) | |
| 147 | ✗ | return AVERROR(ENOMEM); | |
| 148 | |||
| 149 | ✗ | memcpy(frame->data[0], s->taps + s->pts, nb_samples * sizeof(float)); | |
| 150 | |||
| 151 | ✗ | frame->pts = s->pts; | |
| 152 | ✗ | s->pts += nb_samples; | |
| 153 | ✗ | return ff_filter_frame(outlink, frame); | |
| 154 | } | ||
| 155 | |||
| 156 | static const AVFilterPad hilbert_outputs[] = { | ||
| 157 | { | ||
| 158 | .name = "default", | ||
| 159 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 160 | .config_props = config_props, | ||
| 161 | }, | ||
| 162 | }; | ||
| 163 | |||
| 164 | const AVFilter ff_asrc_hilbert = { | ||
| 165 | .name = "hilbert", | ||
| 166 | .description = NULL_IF_CONFIG_SMALL("Generate a Hilbert transform FIR coefficients."), | ||
| 167 | .init = init, | ||
| 168 | .uninit = uninit, | ||
| 169 | .activate = activate, | ||
| 170 | .priv_size = sizeof(HilbertContext), | ||
| 171 | .inputs = NULL, | ||
| 172 | FILTER_OUTPUTS(hilbert_outputs), | ||
| 173 | FILTER_QUERY_FUNC2(query_formats), | ||
| 174 | .priv_class = &hilbert_class, | ||
| 175 | }; | ||
| 176 |