2 * Copyright (c) 2015 Paul B Mahol
4 * This file is part of FFmpeg.
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.
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.
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
23 * audio to video multimedia aphasemeter filter
26 #include "libavutil/avassert.h"
27 #include "libavutil/channel_layout.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/parseutils.h"
37 typedef struct AudioPhaseMeterContext {
41 AVRational frame_rate;
45 int draw_median_phase;
46 } AudioPhaseMeterContext;
48 #define OFFSET(x) offsetof(AudioPhaseMeterContext, x)
49 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
51 static const AVOption aphasemeter_options[] = {
52 { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS },
53 { "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS },
54 { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="800x400"}, 0, 0, FLAGS },
55 { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="800x400"}, 0, 0, FLAGS },
56 { "rc", "set red contrast", OFFSET(contrast[0]), AV_OPT_TYPE_INT, {.i64=2}, 0, 255, FLAGS },
57 { "gc", "set green contrast", OFFSET(contrast[1]), AV_OPT_TYPE_INT, {.i64=7}, 0, 255, FLAGS },
58 { "bc", "set blue contrast", OFFSET(contrast[2]), AV_OPT_TYPE_INT, {.i64=1}, 0, 255, FLAGS },
59 { "mpc", "set median phase color", OFFSET(mpc_str), AV_OPT_TYPE_STRING, {.str = "none"}, 0, 0, FLAGS },
63 AVFILTER_DEFINE_CLASS(aphasemeter);
65 static int query_formats(AVFilterContext *ctx)
67 AVFilterFormats *formats = NULL;
68 AVFilterChannelLayouts *layout = NULL;
69 AVFilterLink *inlink = ctx->inputs[0];
70 AVFilterLink *outlink = ctx->outputs[0];
71 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE };
72 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
74 formats = ff_make_format_list(sample_fmts);
76 return AVERROR(ENOMEM);
77 ff_formats_ref(formats, &inlink->out_formats);
79 ff_add_channel_layout(&layout, AV_CH_LAYOUT_STEREO);
80 ff_channel_layouts_ref(layout, &inlink->out_channel_layouts);
82 formats = ff_all_samplerates();
84 return AVERROR(ENOMEM);
85 ff_formats_ref(formats, &inlink->out_samplerates);
87 formats = ff_make_format_list(pix_fmts);
89 return AVERROR(ENOMEM);
90 ff_formats_ref(formats, &outlink->in_formats);
95 static int config_input(AVFilterLink *inlink)
97 AVFilterContext *ctx = inlink->dst;
98 AudioPhaseMeterContext *s = ctx->priv;
101 nb_samples = FFMAX(1024, ((double)inlink->sample_rate / av_q2d(s->frame_rate)) + 0.5);
102 inlink->partial_buf_size =
103 inlink->min_samples =
104 inlink->max_samples = nb_samples;
109 static int config_output(AVFilterLink *outlink)
111 AVFilterContext *ctx = outlink->src;
112 AudioPhaseMeterContext *s = ctx->priv;
116 outlink->sample_aspect_ratio = (AVRational){1,1};
117 outlink->frame_rate = s->frame_rate;
119 if (!strcmp(s->mpc_str, "none"))
120 s->draw_median_phase = 0;
121 else if (av_parse_color(s->mpc, s->mpc_str, -1, ctx) >= 0)
122 s->draw_median_phase = 1;
124 return AVERROR(EINVAL);
129 static inline int get_x(float phase, int w)
131 return (phase + 1.) / 2. * (w - 1);
134 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
136 AVFilterContext *ctx = inlink->dst;
137 AVFilterLink *outlink = ctx->outputs[0];
138 AudioPhaseMeterContext *s = ctx->priv;
139 AVDictionary **metadata;
140 const int rc = s->contrast[0];
141 const int gc = s->contrast[1];
142 const int bc = s->contrast[2];
148 if (!s->out || s->out->width != outlink->w ||
149 s->out->height != outlink->h) {
150 av_frame_free(&s->out);
151 s->out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
154 return AVERROR(ENOMEM);
158 for (i = 0; i < outlink->h; i++)
159 memset(out->data[0] + i * out->linesize[0], 0, outlink->w * 4);
162 for (i = outlink->h - 1; i >= 10; i--)
163 memmove(out->data[0] + (i ) * out->linesize[0],
164 out->data[0] + (i-1) * out->linesize[0],
166 for (i = 0; i < outlink->w; i++)
167 AV_WL32(out->data[0] + i * 4, 0);
169 s->out->pts = in->pts;
171 for (i = 0; i < in->nb_samples; i++) {
172 const float *src = (float *)in->data[0] + i * 2;
173 const float f = src[0] * src[1] / (src[0]*src[0] + src[1] * src[1]) * 2;
174 const float phase = isnan(f) ? 1 : f;
175 const int x = get_x(phase, s->w);
177 dst = out->data[0] + x * 4;
178 dst[0] = FFMIN(255, dst[0] + rc);
179 dst[1] = FFMIN(255, dst[1] + gc);
180 dst[2] = FFMIN(255, dst[2] + bc);
184 fphase /= in->nb_samples;
186 if (s->draw_median_phase) {
187 dst = out->data[0] + get_x(fphase, s->w) * 4;
188 AV_WL32(dst, AV_RL32(s->mpc));
191 for (i = 1; i < 10 && i < outlink->h; i++)
192 memcpy(out->data[0] + i * out->linesize[0], out->data[0], outlink->w * 4);
194 metadata = avpriv_frame_get_metadatap(out);
198 snprintf(value, sizeof(value), "%f", fphase);
199 av_dict_set(metadata, "lavfi.aphasemeter.phase", value, 0);
203 return ff_filter_frame(outlink, av_frame_clone(s->out));
206 static av_cold void uninit(AVFilterContext *ctx)
208 AudioPhaseMeterContext *s = ctx->priv;
210 av_frame_free(&s->out);
213 static const AVFilterPad inputs[] = {
216 .type = AVMEDIA_TYPE_AUDIO,
217 .config_props = config_input,
218 .filter_frame = filter_frame,
223 static const AVFilterPad outputs[] = {
226 .type = AVMEDIA_TYPE_VIDEO,
227 .config_props = config_output,
232 AVFilter ff_avf_aphasemeter = {
233 .name = "aphasemeter",
234 .description = NULL_IF_CONFIG_SMALL("Convert input audio to phase meter video output."),
236 .query_formats = query_formats,
237 .priv_size = sizeof(AudioPhaseMeterContext),
240 .priv_class = &aphasemeter_class,