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lavfi: add showwaves filter
This commit is contained in:
Stefano Sabatini
parent
93bbe53c44
commit
3ea3e32e03
@ -11,6 +11,7 @@ version next:
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- ffprobe -show_data option
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- RTMPT protocol support
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- iLBC encoding/decoding via libilbc
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- showwaves filter
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version 0.11:
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@ -3826,3 +3826,48 @@ mainly useful as a template and to be employed in analysis / debugging
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tools.
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@c man end VIDEO SINKS
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@chapter Transmedia Filters
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@c man begin TRANSMEDIA FILTERS
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Below is a description of the currently available transmedia filters.
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@section showwaves
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Convert input audio to a video output, representing the samples waves.
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The filter accepts the following named parameters:
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@table @option
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@item n
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Set the number of samples which are printed on the same column. A
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larger value will decrease the frame rate. Must be a positive
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integer. This option can be set only if the value for @var{rate}
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is not explicitly specified.
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@item rate, r
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Set the (approximate) output frame rate. This is done by setting the
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option @var{n}. Default value is "25".
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@item size, s
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Specify the video size for the output. Default value is "600x240".
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@end table
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Some examples follow.
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@itemize
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@item
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Output the input file audio and the corresponding video representation
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at the same time:
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@example
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amovie=a.mp3,asplit[out0],showwaves[out1]
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@end example
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@item
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Create a synthetic signal and show it with showwaves, forcing a
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framerate of 30 frames per second:
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@example
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aevalsrc=sin(1*2*PI*t)*sin(880*2*PI*t):cos(2*PI*200*t),asplit[out0],showwaves=r=30[out1]
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@end example
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@end itemize
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@c man end TRANSMEDIA FILTERS
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@ -193,6 +193,8 @@ OBJS-$(CONFIG_MP_FILTER) += libmpcodecs/vf_yuvcsp.o
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OBJS-$(CONFIG_MP_FILTER) += libmpcodecs/vf_yvu9.o
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OBJS-$(CONFIG_MP_FILTER) += libmpcodecs/pullup.o
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# transmedia filters
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OBJS-$(CONFIG_SHOWWAVES_FILTER) += avf_showwaves.o
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TESTPROGS = drawutils formats
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@ -129,6 +129,9 @@ void avfilter_register_all(void)
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REGISTER_FILTER (BUFFERSINK, buffersink, vsink);
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REGISTER_FILTER (NULLSINK, nullsink, vsink);
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/* transmedia filters */
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REGISTER_FILTER (SHOWWAVES, showwaves, avf);
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/* those filters are part of public or internal API => registered
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* unconditionally */
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{
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259
libavfilter/avf_showwaves.c
Normal file
259
libavfilter/avf_showwaves.c
Normal file
@ -0,0 +1,259 @@
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/*
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* Copyright (c) 2012 Stefano Sabatini
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* audio to video transmedia filter
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*/
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#include "libavutil/audioconvert.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "audio.h"
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#include "video.h"
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typedef struct {
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const AVClass *class;
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int w, h;
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char *rate_str;
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AVRational rate;
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int buf_idx;
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AVFilterBufferRef *outpicref;
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int req_fullfilled;
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int n;
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int sample_count_mod;
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} ShowWavesContext;
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#define OFFSET(x) offsetof(ShowWavesContext, x)
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static const AVOption showwaves_options[] = {
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{ "rate", "set video rate", OFFSET(rate_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
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{ "r", "set video rate", OFFSET(rate_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0 },
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{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0 },
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{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0 },
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{ "n", "set how many samples to show in the same point", OFFSET(n), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX},
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{ NULL },
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};
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static const AVClass showwaves_class = {
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.class_name = "showwaves",
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.item_name = av_default_item_name,
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.option = showwaves_options,
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.version = LIBAVUTIL_VERSION_INT,
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.category = AV_CLASS_CATEGORY_FILTER,
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};
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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ShowWavesContext *showwaves = ctx->priv;
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int err;
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showwaves->class = &showwaves_class;
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av_opt_set_defaults(showwaves);
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showwaves->buf_idx = 0;
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if ((err = av_set_options_string(showwaves, args, "=", ":")) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
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return err;
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}
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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ShowWavesContext *showwaves = ctx->priv;
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av_freep(&showwaves->rate_str);
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avfilter_unref_bufferp(&showwaves->outpicref);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats = NULL;
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AVFilterChannelLayouts *layouts = NULL;
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AVFilterLink *inlink = ctx->inputs[0];
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AVFilterLink *outlink = ctx->outputs[0];
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static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, -1 };
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static const enum PixelFormat pix_fmts[] = { PIX_FMT_GRAY8, -1 };
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/* set input audio formats */
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formats = ff_make_format_list(sample_fmts);
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if (!formats)
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return AVERROR(ENOMEM);
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ff_formats_ref(formats, &inlink->out_formats);
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layouts = ff_all_channel_layouts();
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if (!layouts)
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return AVERROR(ENOMEM);
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ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
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formats = ff_all_samplerates();
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if (!formats)
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return AVERROR(ENOMEM);
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ff_formats_ref(formats, &inlink->out_samplerates);
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/* set output video format */
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formats = ff_make_format_list(pix_fmts);
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if (!formats)
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return AVERROR(ENOMEM);
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ff_formats_ref(formats, &outlink->in_formats);
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return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AVFilterLink *inlink = ctx->inputs[0];
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ShowWavesContext *showwaves = ctx->priv;
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int err;
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if (showwaves->n && showwaves->rate_str) {
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av_log(ctx, AV_LOG_ERROR, "Options 'n' and 'rate' cannot be set at the same time\n");
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return AVERROR(EINVAL);
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}
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if (!showwaves->n) {
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if (!showwaves->rate_str)
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showwaves->rate = (AVRational){25,1}; /* set default value */
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else if ((err = av_parse_video_rate(&showwaves->rate, showwaves->rate_str)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: '%s'\n", showwaves->rate_str);
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return err;
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}
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showwaves->n = FFMAX(1, ((double)inlink->sample_rate / (showwaves->w * av_q2d(showwaves->rate))) + 0.5);
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}
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outlink->w = showwaves->w;
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outlink->h = showwaves->h;
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outlink->sample_aspect_ratio = (AVRational){1,1};
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outlink->frame_rate = av_div_q((AVRational){inlink->sample_rate,showwaves->n},
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(AVRational){showwaves->w,1});
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av_log(ctx, AV_LOG_INFO, "s:%dx%d r:%f n:%d\n",
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showwaves->w, showwaves->h, av_q2d(outlink->frame_rate), showwaves->n);
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return 0;
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}
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inline static void push_frame(AVFilterLink *outlink)
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{
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ShowWavesContext *showwaves = outlink->src->priv;
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ff_start_frame(outlink, showwaves->outpicref);
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ff_draw_slice(outlink, 0, outlink->h, 1);
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ff_end_frame(outlink);
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showwaves->req_fullfilled = 1;
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showwaves->outpicref = NULL;
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showwaves->buf_idx = 0;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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ShowWavesContext *showwaves = outlink->src->priv;
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AVFilterLink *inlink = outlink->src->inputs[0];
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int ret;
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showwaves->req_fullfilled = 0;
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do {
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ret = avfilter_request_frame(inlink);
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} while (!showwaves->req_fullfilled && ret >= 0);
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if (ret == AVERROR_EOF && showwaves->outpicref)
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push_frame(outlink);
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return ret;
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}
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#define MAX_INT16 ((1<<15) -1)
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static void filter_samples(AVFilterLink *inlink, AVFilterBufferRef *insamples)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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ShowWavesContext *showwaves = ctx->priv;
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const int nb_samples = insamples->audio->nb_samples;
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AVFilterBufferRef *outpicref = showwaves->outpicref;
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int linesize = outpicref ? outpicref->linesize[0] : 0;
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int16_t *p = (int16_t *)insamples->data[0];
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int nb_channels = av_get_channel_layout_nb_channels(insamples->audio->channel_layout);
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int i, j, h;
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const int n = showwaves->n;
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const int x = 255 / (nb_channels * n); /* multiplication factor, pre-computed to avoid in-loop divisions */
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/* draw data in the buffer */
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for (i = 0; i < nb_samples; i++) {
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if (showwaves->buf_idx == 0) {
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showwaves->outpicref = outpicref =
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ff_get_video_buffer(outlink, AV_PERM_WRITE|AV_PERM_ALIGN,
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outlink->w, outlink->h);
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outpicref->video->w = outlink->w;
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outpicref->video->h = outlink->h;
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outpicref->pts = insamples->pts;
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outlink->out_buf = outpicref;
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linesize = outpicref->linesize[0];
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memset(outpicref->data[0], 0, showwaves->h*linesize);
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}
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for (j = 0; j < nb_channels; j++) {
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h = showwaves->h/2 - av_rescale(*p++, showwaves->h/2, MAX_INT16);
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if (h >= 0 && h < outlink->h)
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*(outpicref->data[0] + showwaves->buf_idx + h * linesize) += x;
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}
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showwaves->sample_count_mod++;
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if (showwaves->sample_count_mod == n) {
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showwaves->sample_count_mod = 0;
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showwaves->buf_idx++;
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}
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if (showwaves->buf_idx == showwaves->w)
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push_frame(outlink);
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}
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avfilter_unref_buffer(insamples);
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}
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AVFilter avfilter_avf_showwaves = {
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.name = "showwaves",
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.description = NULL_IF_CONFIG_SMALL("Convert input audio to a video output."),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.priv_size = sizeof(ShowWavesContext),
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.inputs = (const AVFilterPad[]) {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_samples = filter_samples,
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.min_perms = AV_PERM_READ,
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},
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{ .name = NULL }
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},
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.outputs = (const AVFilterPad[]) {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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.request_frame = request_frame,
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},
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{ .name = NULL }
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},
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};
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@ -29,7 +29,7 @@
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#include "libavutil/avutil.h"
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#define LIBAVFILTER_VERSION_MAJOR 2
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#define LIBAVFILTER_VERSION_MINOR 81
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#define LIBAVFILTER_VERSION_MINOR 82
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#define LIBAVFILTER_VERSION_MICRO 100
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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