| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2015 The FFmpeg Project | ||
| 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 | ||
| 8 | * License 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 GNU | ||
| 14 | * Lesser General Public License for more details. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU Lesser General Public | ||
| 17 | * License along with FFmpeg; if not, write to the Free Software | ||
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | #include "libavutil/channel_layout.h" | ||
| 22 | #include "libavutil/opt.h" | ||
| 23 | #include "avfilter.h" | ||
| 24 | #include "audio.h" | ||
| 25 | #include "formats.h" | ||
| 26 | |||
| 27 | typedef struct ExtraStereoContext { | ||
| 28 | const AVClass *class; | ||
| 29 | float mult; | ||
| 30 | int clip; | ||
| 31 | } ExtraStereoContext; | ||
| 32 | |||
| 33 | #define OFFSET(x) offsetof(ExtraStereoContext, x) | ||
| 34 | #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM | ||
| 35 | |||
| 36 | static const AVOption extrastereo_options[] = { | ||
| 37 | { "m", "set the difference coefficient", OFFSET(mult), AV_OPT_TYPE_FLOAT, {.dbl=2.5}, -10, 10, A }, | ||
| 38 | { "c", "enable clipping", OFFSET(clip), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, A }, | ||
| 39 | { NULL } | ||
| 40 | }; | ||
| 41 | |||
| 42 | AVFILTER_DEFINE_CLASS(extrastereo); | ||
| 43 | |||
| 44 | 1 | static int query_formats(AVFilterContext *ctx) | |
| 45 | { | ||
| 46 | 1 | AVFilterFormats *formats = NULL; | |
| 47 | 1 | AVFilterChannelLayouts *layout = NULL; | |
| 48 | int ret; | ||
| 49 | |||
| 50 |
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2 | if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_FLT )) < 0 || |
| 51 |
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2 | (ret = ff_set_common_formats (ctx , formats )) < 0 || |
| 52 |
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2 | (ret = ff_add_channel_layout (&layout , &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO)) < 0 || |
| 53 | 1 | (ret = ff_set_common_channel_layouts (ctx , layout )) < 0) | |
| 54 | ✗ | return ret; | |
| 55 | |||
| 56 | 1 | return ff_set_common_all_samplerates(ctx); | |
| 57 | } | ||
| 58 | |||
| 59 | 20 | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
| 60 | { | ||
| 61 | 20 | AVFilterContext *ctx = inlink->dst; | |
| 62 | 20 | AVFilterLink *outlink = ctx->outputs[0]; | |
| 63 | 20 | ExtraStereoContext *s = ctx->priv; | |
| 64 | 20 | const float *src = (const float *)in->data[0]; | |
| 65 | 20 | const float mult = s->mult; | |
| 66 | AVFrame *out; | ||
| 67 | float *dst; | ||
| 68 | int n; | ||
| 69 | |||
| 70 |
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20 | if (av_frame_is_writable(in)) { |
| 71 | 20 | out = in; | |
| 72 | } else { | ||
| 73 | ✗ | out = ff_get_audio_buffer(outlink, in->nb_samples); | |
| 74 | ✗ | if (!out) { | |
| 75 | ✗ | av_frame_free(&in); | |
| 76 | ✗ | return AVERROR(ENOMEM); | |
| 77 | } | ||
| 78 | ✗ | av_frame_copy_props(out, in); | |
| 79 | } | ||
| 80 | 20 | dst = (float *)out->data[0]; | |
| 81 | |||
| 82 |
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20500 | for (n = 0; n < in->nb_samples; n++) { |
| 83 | float average, left, right; | ||
| 84 | |||
| 85 | 20480 | left = src[n * 2 ]; | |
| 86 | 20480 | right = src[n * 2 + 1]; | |
| 87 | 20480 | average = (left + right) / 2.; | |
| 88 | 20480 | left = average + mult * (left - average); | |
| 89 | 20480 | right = average + mult * (right - average); | |
| 90 | |||
| 91 |
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20480 | if (s->clip) { |
| 92 | 20480 | left = av_clipf(left, -1, 1); | |
| 93 | 20480 | right = av_clipf(right, -1, 1); | |
| 94 | } | ||
| 95 | |||
| 96 | 20480 | dst[n * 2 ] = left; | |
| 97 | 20480 | dst[n * 2 + 1] = right; | |
| 98 | } | ||
| 99 | |||
| 100 |
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20 | if (out != in) |
| 101 | ✗ | av_frame_free(&in); | |
| 102 | 20 | return ff_filter_frame(outlink, out); | |
| 103 | } | ||
| 104 | |||
| 105 | static const AVFilterPad inputs[] = { | ||
| 106 | { | ||
| 107 | .name = "default", | ||
| 108 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 109 | .filter_frame = filter_frame, | ||
| 110 | }, | ||
| 111 | }; | ||
| 112 | |||
| 113 | const AVFilter ff_af_extrastereo = { | ||
| 114 | .name = "extrastereo", | ||
| 115 | .description = NULL_IF_CONFIG_SMALL("Increase difference between stereo audio channels."), | ||
| 116 | .priv_size = sizeof(ExtraStereoContext), | ||
| 117 | .priv_class = &extrastereo_class, | ||
| 118 | FILTER_INPUTS(inputs), | ||
| 119 | FILTER_OUTPUTS(ff_audio_default_filterpad), | ||
| 120 | FILTER_QUERY_FUNC(query_formats), | ||
| 121 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, | ||
| 122 | .process_command = ff_filter_process_command, | ||
| 123 | }; | ||
| 124 |