2 * Copyright (c) 2012 Stefano Sabatini
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 filter
26 #include "libavutil/channel_layout.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/parseutils.h"
50 enum ShowWavesMode mode;
53 #define OFFSET(x) offsetof(ShowWavesContext, x)
54 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
56 static const AVOption showwaves_options[] = {
57 { "rate", "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS },
58 { "r", "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS },
59 { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
60 { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
61 { "n", "set how many samples to show in the same point", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
63 {"mode", "select display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_POINT}, 0, MODE_NB-1, FLAGS, "mode"},
64 {"point", "draw a point for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_POINT}, .flags=FLAGS, .unit="mode"},
65 {"line", "draw a line for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_LINE}, .flags=FLAGS, .unit="mode"},
69 AVFILTER_DEFINE_CLASS(showwaves);
71 static av_cold int init(AVFilterContext *ctx, const char *args)
73 ShowWavesContext *showwaves = ctx->priv;
76 showwaves->class = &showwaves_class;
77 av_opt_set_defaults(showwaves);
78 showwaves->buf_idx = 0;
80 if ((err = av_set_options_string(showwaves, args, "=", ":")) < 0)
86 static av_cold void uninit(AVFilterContext *ctx)
88 ShowWavesContext *showwaves = ctx->priv;
90 av_frame_free(&showwaves->outpicref);
93 static int query_formats(AVFilterContext *ctx)
95 AVFilterFormats *formats = NULL;
96 AVFilterChannelLayouts *layouts = NULL;
97 AVFilterLink *inlink = ctx->inputs[0];
98 AVFilterLink *outlink = ctx->outputs[0];
99 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE };
100 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
102 /* set input audio formats */
103 formats = ff_make_format_list(sample_fmts);
105 return AVERROR(ENOMEM);
106 ff_formats_ref(formats, &inlink->out_formats);
108 layouts = ff_all_channel_layouts();
110 return AVERROR(ENOMEM);
111 ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
113 formats = ff_all_samplerates();
115 return AVERROR(ENOMEM);
116 ff_formats_ref(formats, &inlink->out_samplerates);
118 /* set output video format */
119 formats = ff_make_format_list(pix_fmts);
121 return AVERROR(ENOMEM);
122 ff_formats_ref(formats, &outlink->in_formats);
127 static int config_output(AVFilterLink *outlink)
129 AVFilterContext *ctx = outlink->src;
130 AVFilterLink *inlink = ctx->inputs[0];
131 ShowWavesContext *showwaves = ctx->priv;
134 showwaves->n = FFMAX(1, ((double)inlink->sample_rate / (showwaves->w * av_q2d(showwaves->rate))) + 0.5);
136 outlink->w = showwaves->w;
137 outlink->h = showwaves->h;
138 outlink->sample_aspect_ratio = (AVRational){1,1};
140 outlink->frame_rate = av_div_q((AVRational){inlink->sample_rate,showwaves->n},
141 (AVRational){showwaves->w,1});
143 av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d r:%f n:%d\n",
144 showwaves->w, showwaves->h, av_q2d(outlink->frame_rate), showwaves->n);
148 inline static int push_frame(AVFilterLink *outlink)
150 ShowWavesContext *showwaves = outlink->src->priv;
153 if ((ret = ff_filter_frame(outlink, showwaves->outpicref)) >= 0)
154 showwaves->req_fullfilled = 1;
155 showwaves->outpicref = NULL;
156 showwaves->buf_idx = 0;
160 static int request_frame(AVFilterLink *outlink)
162 ShowWavesContext *showwaves = outlink->src->priv;
163 AVFilterLink *inlink = outlink->src->inputs[0];
166 showwaves->req_fullfilled = 0;
168 ret = ff_request_frame(inlink);
169 } while (!showwaves->req_fullfilled && ret >= 0);
171 if (ret == AVERROR_EOF && showwaves->outpicref)
176 #define MAX_INT16 ((1<<15) -1)
178 static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
180 AVFilterContext *ctx = inlink->dst;
181 AVFilterLink *outlink = ctx->outputs[0];
182 ShowWavesContext *showwaves = ctx->priv;
183 const int nb_samples = insamples->nb_samples;
184 AVFrame *outpicref = showwaves->outpicref;
185 int linesize = outpicref ? outpicref->linesize[0] : 0;
186 int16_t *p = (int16_t *)insamples->data[0];
187 int nb_channels = av_get_channel_layout_nb_channels(insamples->channel_layout);
188 int i, j, k, h, ret = 0;
189 const int n = showwaves->n;
190 const int x = 255 / (nb_channels * n); /* multiplication factor, pre-computed to avoid in-loop divisions */
192 /* draw data in the buffer */
193 for (i = 0; i < nb_samples; i++) {
194 if (!showwaves->outpicref) {
195 showwaves->outpicref = outpicref =
196 ff_get_video_buffer(outlink, outlink->w, outlink->h);
198 return AVERROR(ENOMEM);
199 outpicref->width = outlink->w;
200 outpicref->height = outlink->h;
201 outpicref->pts = insamples->pts +
202 av_rescale_q((p - (int16_t *)insamples->data[0]) / nb_channels,
203 (AVRational){ 1, inlink->sample_rate },
205 linesize = outpicref->linesize[0];
206 memset(outpicref->data[0], 0, showwaves->h*linesize);
208 for (j = 0; j < nb_channels; j++) {
209 h = showwaves->h/2 - av_rescale(*p++, showwaves->h/2, MAX_INT16);
210 switch (showwaves->mode) {
212 if (h >= 0 && h < outlink->h)
213 *(outpicref->data[0] + showwaves->buf_idx + h * linesize) += x;
218 int start = showwaves->h/2, end = av_clip(h, 0, outlink->h-1);
219 if (start > end) FFSWAP(int16_t, start, end);
220 for (k = start; k < end; k++)
221 *(outpicref->data[0] + showwaves->buf_idx + k * linesize) += x;
227 showwaves->sample_count_mod++;
228 if (showwaves->sample_count_mod == n) {
229 showwaves->sample_count_mod = 0;
230 showwaves->buf_idx++;
232 if (showwaves->buf_idx == showwaves->w)
233 if ((ret = push_frame(outlink)) < 0)
235 outpicref = showwaves->outpicref;
238 av_frame_free(&insamples);
242 static const AVFilterPad showwaves_inputs[] = {
245 .type = AVMEDIA_TYPE_AUDIO,
246 .filter_frame = filter_frame,
251 static const AVFilterPad showwaves_outputs[] = {
254 .type = AVMEDIA_TYPE_VIDEO,
255 .config_props = config_output,
256 .request_frame = request_frame,
261 AVFilter avfilter_avf_showwaves = {
263 .description = NULL_IF_CONFIG_SMALL("Convert input audio to a video output."),
266 .query_formats = query_formats,
267 .priv_size = sizeof(ShowWavesContext),
268 .inputs = showwaves_inputs,
269 .outputs = showwaves_outputs,
270 .priv_class = &showwaves_class,