/*
* Copyright (c) 2013 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* audio to video multimedia vectorscope filter
*/
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
#include "formats.h"
#include "audio.h"
#include "video.h"
#include "internal.h"
enum VectorScopeMode {
LISSAJOUS,
LISSAJOUS_XY,
POLAR,
MODE_NB,
};
typedef struct AudioVectorScopeContext {
const AVClass *class;
AVFrame *outpicref;
int w, h;
int hw, hh;
int mode;
int contrast[4];
int fade[4];
double zoom;
AVRational frame_rate;
} AudioVectorScopeContext;
#define OFFSET(x) offsetof(AudioVectorScopeContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption avectorscope_options[] = {
{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=LISSAJOUS}, 0, MODE_NB-1, FLAGS, "mode" },
{ "m", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=LISSAJOUS}, 0, MODE_NB-1, FLAGS, "mode" },
{ "lissajous", "", 0, AV_OPT_TYPE_CONST, {.i64=LISSAJOUS}, 0, 0, FLAGS, "mode" },
{ "lissajous_xy", "", 0, AV_OPT_TYPE_CONST, {.i64=LISSAJOUS_XY}, 0, 0, FLAGS, "mode" },
{ "polar", "", 0, AV_OPT_TYPE_CONST, {.i64=POLAR}, 0, 0, FLAGS, "mode" },
{ "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS },
{ "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS },
{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },
{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },
{ "rc", "set red contrast", OFFSET(contrast[0]), AV_OPT_TYPE_INT, {.i64=40}, 0, 255, FLAGS },
{ "gc", "set green contrast", OFFSET(contrast[1]), AV_OPT_TYPE_INT, {.i64=160}, 0, 255, FLAGS },
{ "bc", "set blue contrast", OFFSET(contrast[2]), AV_OPT_TYPE_INT, {.i64=80}, 0, 255, FLAGS },
{ "ac", "set alpha contrast", OFFSET(contrast[3]), AV_OPT_TYPE_INT, {.i64=255}, 0, 255, FLAGS },
{ "rf", "set red fade", OFFSET(fade[0]), AV_OPT_TYPE_INT, {.i64=15}, 0, 255, FLAGS },
{ "gf", "set green fade", OFFSET(fade[1]), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, FLAGS },
{ "bf", "set blue fade", OFFSET(fade[2]), AV_OPT_TYPE_INT, {.i64=5}, 0, 255, FLAGS },
{ "af", "set alpha fade", OFFSET(fade[3]), AV_OPT_TYPE_INT, {.i64=5}, 0, 255, FLAGS },
{ "zoom", "set zoom factor", OFFSET(zoom), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 10, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(avectorscope);
static void draw_dot(AudioVectorScopeContext *s, unsigned x, unsigned y)
{
const int linesize = s->outpicref->linesize[0];
uint8_t *dst;
if (s->zoom > 1) {
if (y >= s->h || x >= s->w)
return;
} else {
y = FFMIN(y, s->h - 1);
x = FFMIN(x, s->w - 1);
}
dst = &s->outpicref->data[0][y * linesize + x * 4];
dst[0] = FFMIN(dst[0] + s->contrast[0], 255);
dst[1] = FFMIN(dst[1] + s->contrast[1], 255);
dst[2] = FFMIN(dst[2] + s->contrast[2], 255);
dst[3] = FFMIN(dst[3] + s->contrast[3], 255);
}
static void fade(AudioVectorScopeContext *s)
{
const int linesize = s->outpicref->linesize[0];
int i, j;
if (s->fade[0] || s->fade[1] || s->fade[2]) {
uint8_t *d = s->outpicref->data[0];
for (i = 0; i < s->h; i++) {
for (j = 0; j < s->w*4; j+=4) {
d[j+0] = FFMAX(d[j+0] - s->fade[0], 0);
d[j+1] = FFMAX(d[j+1] - s->fade[1], 0);
d[j+2] = FFMAX(d[j+2] - s->fade[2], 0);
d[j+3] = FFMAX(d[j+3] - s->fade[3], 0);
}
d += linesize;
}
}
}
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *formats = NULL;
AVFilterChannelLayouts *layout = NULL;
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE };
static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
formats = ff_make_format_list(sample_fmts);
if (!formats)
return AVERROR(ENOMEM);
ff_formats_ref(formats, &inlink->out_formats);
ff_add_channel_layout(&layout, AV_CH_LAYOUT_STEREO);
ff_channel_layouts_ref(layout, &inlink->out_channel_layouts);
formats = ff_all_samplerates();
if (!formats)
return AVERROR(ENOMEM);
ff_formats_ref(formats, &inlink->out_samplerates);
formats = ff_make_format_list(pix_fmts);
if (!formats)
return AVERROR(ENOMEM);
ff_formats_ref(formats, &outlink->in_formats);
return 0;
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
AudioVectorScopeContext *s = ctx->priv;
int nb_samples;
nb_samples = FFMAX(1024, ((double)inlink->sample_rate / av_q2d(s->frame_rate)) + 0.5);
inlink->partial_buf_size =
inlink->min_samples =
inlink->max_samples = nb_samples;
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AudioVectorScopeContext *s = outlink->src->priv;
outlink->w = s->w;
outlink->h = s->h;
outlink->sample_aspect_ratio = (AVRational){1,1};
outlink->frame_rate = s->frame_rate;
s->hw = s->w / 2;
s->hh = s->h / 2;
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
AudioVectorScopeContext *s = ctx->priv;
const int hw = s->hw;
const int hh = s->hh;
unsigned x, y;
const double zoom = s->zoom;
int i;
if (!s->outpicref || s->outpicref->width != outlink->w ||
s->outpicref->height != outlink->h) {
av_frame_free(&s->outpicref);
s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!s->outpicref) {
av_frame_free(&insamples);
return AVERROR(ENOMEM);
}
for (i = 0; i < outlink->h; i++)
memset(s
->outpicref
->data
[0] + i
* s
->outpicref
->linesize
[0], 0, outlink
->w
* 4); }
s->outpicref->pts = insamples->pts;
fade(s);
switch (insamples->format) {
case AV_SAMPLE_FMT_S16:
for (i = 0; i < insamples->nb_samples; i++) {
int16_t *src = (int16_t *)insamples->data[0] + i * 2;
if (s->mode == LISSAJOUS) {
x = ((src[1] - src[0]) * zoom / (float)(UINT16_MAX) + 1) * hw;
y = (1.0 - (src[0] + src[1]) * zoom / (float)UINT16_MAX) * hh;
} else if (s->mode == LISSAJOUS_XY) {
x = (src[1] * zoom / (float)INT16_MAX + 1) * hw;
y = (src[0] * zoom / (float)INT16_MAX + 1) * hh;
} else {
float sx, sy, cx, cy;
sx = src[1] * zoom / (float)INT16_MAX;
sy = src[0] * zoom / (float)INT16_MAX;
cx = sx * sqrtf(1 - 0.5*sy*sy);
cy = sy * sqrtf(1 - 0.5*sx*sx);
x = hw + hw * FFSIGN(cx + cy) * (cx - cy) * .7;
y = s->h - s->h * FFABS(cx + cy) * .7;
}
draw_dot(s, x, y);
}
break;
case AV_SAMPLE_FMT_FLT:
for (i = 0; i < insamples->nb_samples; i++) {
float *src = (float *)insamples->data[0] + i * 2;
if (s->mode == LISSAJOUS) {
x = ((src[1] - src[0]) * zoom / 2 + 1) * hw;
y = (1.0 - (src[0] + src[1]) * zoom / 2) * hh;
} else if (s->mode == LISSAJOUS_XY){
x = (src[1] * zoom + 1) * hw;
y = (src[0] * zoom + 1) * hh;
} else {
float sx, sy, cx, cy;
sx = src[1] * zoom;
sy = src[0] * zoom;
cx = sx * sqrtf(1 - 0.5 * sy * sy);
cy = sy * sqrtf(1 - 0.5 * sx * sx);
x = hw + hw * FFSIGN(cx + cy) * (cx - cy) * .7;
y = s->h - s->h * FFABS(cx + cy) * .7;
}
draw_dot(s, x, y);
}
break;
}
av_frame_free(&insamples);
return ff_filter_frame(outlink, av_frame_clone(s->outpicref));
}
static av_cold void uninit(AVFilterContext *ctx)
{
AudioVectorScopeContext *s = ctx->priv;
av_frame_free(&s->outpicref);
}
static const AVFilterPad audiovectorscope_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad audiovectorscope_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
AVFilter ff_avf_avectorscope = {
.name = "avectorscope",
.description = NULL_IF_CONFIG_SMALL("Convert input audio to vectorscope video output."),
.uninit = uninit,
.query_formats = query_formats,
.priv_size = sizeof(AudioVectorScopeContext),
.inputs = audiovectorscope_inputs,
.outputs = audiovectorscope_outputs,
.priv_class = &avectorscope_class,
};