| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (C) 2012 VLC authors and VideoLAN | ||
| 3 | * Author : Sukrit Sangwan < sukritsangwan at gmail dot com > | ||
| 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/channel_layout.h" | ||
| 23 | #include "libavutil/mem.h" | ||
| 24 | #include "libavutil/opt.h" | ||
| 25 | #include "avfilter.h" | ||
| 26 | #include "audio.h" | ||
| 27 | #include "formats.h" | ||
| 28 | |||
| 29 | typedef struct StereoWidenContext { | ||
| 30 | const AVClass *class; | ||
| 31 | |||
| 32 | float delay; | ||
| 33 | float feedback; | ||
| 34 | float crossfeed; | ||
| 35 | float drymix; | ||
| 36 | |||
| 37 | float *buffer; | ||
| 38 | float *cur; | ||
| 39 | int length; | ||
| 40 | } StereoWidenContext; | ||
| 41 | |||
| 42 | #define OFFSET(x) offsetof(StereoWidenContext, x) | ||
| 43 | #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | ||
| 44 | #define AT AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM | ||
| 45 | |||
| 46 | static const AVOption stereowiden_options[] = { | ||
| 47 | { "delay", "set delay time", OFFSET(delay), AV_OPT_TYPE_FLOAT, {.dbl=20}, 1, 100, A }, | ||
| 48 | { "feedback", "set feedback gain", OFFSET(feedback), AV_OPT_TYPE_FLOAT, {.dbl=.3}, 0, 0.9, AT }, | ||
| 49 | { "crossfeed", "set cross feed", OFFSET(crossfeed), AV_OPT_TYPE_FLOAT, {.dbl=.3}, 0, 0.8, AT }, | ||
| 50 | { "drymix", "set dry-mix", OFFSET(drymix), AV_OPT_TYPE_FLOAT, {.dbl=.8}, 0, 1.0, AT }, | ||
| 51 | { NULL } | ||
| 52 | }; | ||
| 53 | |||
| 54 | AVFILTER_DEFINE_CLASS(stereowiden); | ||
| 55 | |||
| 56 | ✗ | static int query_formats(AVFilterContext *ctx) | |
| 57 | { | ||
| 58 | ✗ | AVFilterFormats *formats = NULL; | |
| 59 | ✗ | AVFilterChannelLayouts *layout = NULL; | |
| 60 | int ret; | ||
| 61 | |||
| 62 | ✗ | if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_FLT )) < 0 || | |
| 63 | ✗ | (ret = ff_set_common_formats (ctx , formats )) < 0 || | |
| 64 | ✗ | (ret = ff_add_channel_layout (&layout , &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO)) < 0 || | |
| 65 | ✗ | (ret = ff_set_common_channel_layouts (ctx , layout )) < 0) | |
| 66 | ✗ | return ret; | |
| 67 | |||
| 68 | ✗ | return ff_set_common_all_samplerates(ctx); | |
| 69 | } | ||
| 70 | |||
| 71 | ✗ | static int config_input(AVFilterLink *inlink) | |
| 72 | { | ||
| 73 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 74 | ✗ | StereoWidenContext *s = ctx->priv; | |
| 75 | |||
| 76 | ✗ | s->length = lrintf(s->delay * inlink->sample_rate / 1000); | |
| 77 | ✗ | s->length *= 2; | |
| 78 | ✗ | if (s->length == 0) | |
| 79 | ✗ | return AVERROR(EINVAL); | |
| 80 | ✗ | s->buffer = av_calloc(s->length, sizeof(*s->buffer)); | |
| 81 | ✗ | if (!s->buffer) | |
| 82 | ✗ | return AVERROR(ENOMEM); | |
| 83 | ✗ | s->cur = s->buffer; | |
| 84 | |||
| 85 | ✗ | return 0; | |
| 86 | } | ||
| 87 | |||
| 88 | ✗ | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
| 89 | { | ||
| 90 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 91 | ✗ | AVFilterLink *outlink = ctx->outputs[0]; | |
| 92 | ✗ | StereoWidenContext *s = ctx->priv; | |
| 93 | ✗ | const float *src = (const float *)in->data[0]; | |
| 94 | ✗ | const float drymix = s->drymix; | |
| 95 | ✗ | const float crossfeed = s->crossfeed; | |
| 96 | ✗ | const float feedback = s->feedback; | |
| 97 | AVFrame *out; | ||
| 98 | float *dst; | ||
| 99 | int n; | ||
| 100 | |||
| 101 | ✗ | if (av_frame_is_writable(in)) { | |
| 102 | ✗ | out = in; | |
| 103 | } else { | ||
| 104 | ✗ | out = ff_get_audio_buffer(outlink, in->nb_samples); | |
| 105 | ✗ | if (!out) { | |
| 106 | ✗ | av_frame_free(&in); | |
| 107 | ✗ | return AVERROR(ENOMEM); | |
| 108 | } | ||
| 109 | ✗ | av_frame_copy_props(out, in); | |
| 110 | } | ||
| 111 | ✗ | dst = (float *)out->data[0]; | |
| 112 | |||
| 113 | ✗ | for (n = 0; n < in->nb_samples; n++, src += 2, dst += 2, s->cur += 2) { | |
| 114 | ✗ | const float left = src[0], right = src[1]; | |
| 115 | |||
| 116 | ✗ | if (s->cur == s->buffer + s->length) | |
| 117 | ✗ | s->cur = s->buffer; | |
| 118 | |||
| 119 | ✗ | if (ctx->is_disabled) { | |
| 120 | ✗ | dst[0] = left; | |
| 121 | ✗ | dst[1] = right; | |
| 122 | } else { | ||
| 123 | ✗ | dst[0] = drymix * left - crossfeed * right - feedback * s->cur[1]; | |
| 124 | ✗ | dst[1] = drymix * right - crossfeed * left - feedback * s->cur[0]; | |
| 125 | } | ||
| 126 | |||
| 127 | ✗ | s->cur[0] = left; | |
| 128 | ✗ | s->cur[1] = right; | |
| 129 | } | ||
| 130 | |||
| 131 | ✗ | if (out != in) | |
| 132 | ✗ | av_frame_free(&in); | |
| 133 | ✗ | return ff_filter_frame(outlink, out); | |
| 134 | } | ||
| 135 | |||
| 136 | ✗ | static av_cold void uninit(AVFilterContext *ctx) | |
| 137 | { | ||
| 138 | ✗ | StereoWidenContext *s = ctx->priv; | |
| 139 | |||
| 140 | ✗ | av_freep(&s->buffer); | |
| 141 | ✗ | } | |
| 142 | |||
| 143 | static const AVFilterPad inputs[] = { | ||
| 144 | { | ||
| 145 | .name = "default", | ||
| 146 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 147 | .filter_frame = filter_frame, | ||
| 148 | .config_props = config_input, | ||
| 149 | }, | ||
| 150 | }; | ||
| 151 | |||
| 152 | const AVFilter ff_af_stereowiden = { | ||
| 153 | .name = "stereowiden", | ||
| 154 | .description = NULL_IF_CONFIG_SMALL("Apply stereo widening effect."), | ||
| 155 | .priv_size = sizeof(StereoWidenContext), | ||
| 156 | .priv_class = &stereowiden_class, | ||
| 157 | .uninit = uninit, | ||
| 158 | FILTER_INPUTS(inputs), | ||
| 159 | FILTER_OUTPUTS(ff_audio_default_filterpad), | ||
| 160 | FILTER_QUERY_FUNC(query_formats), | ||
| 161 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, | ||
| 162 | .process_command = ff_filter_process_command, | ||
| 163 | }; | ||
| 164 |