/*
* Copyright (c) 2015 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 aphasemeter filter
*/
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
#include "formats.h"
#include "audio.h"
#include "video.h"
#include "internal.h"
typedef struct AudioPhaseMeterContext {
const AVClass *class;
AVFrame *out;
int w, h;
AVRational frame_rate;
int contrast[4];
uint8_t *mpc_str;
uint8_t mpc[4];
int draw_median_phase;
} AudioPhaseMeterContext;
#define OFFSET(x) offsetof(AudioPhaseMeterContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption aphasemeter_options[] = {
{ "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="800x400"}, 0, 0, FLAGS },
{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="800x400"}, 0, 0, FLAGS },
{ "rc", "set red contrast", OFFSET(contrast[0]), AV_OPT_TYPE_INT, {.i64=2}, 0, 255, FLAGS },
{ "gc", "set green contrast", OFFSET(contrast[1]), AV_OPT_TYPE_INT, {.i64=7}, 0, 255, FLAGS },
{ "bc", "set blue contrast", OFFSET(contrast[2]), AV_OPT_TYPE_INT, {.i64=1}, 0, 255, FLAGS },
{ "mpc", "set median phase color", OFFSET(mpc_str), AV_OPT_TYPE_STRING, {.str = "none"}, 0, 0, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(aphasemeter);
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_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;
AudioPhaseMeterContext *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)
{
AVFilterContext *ctx = outlink->src;
AudioPhaseMeterContext *s = ctx->priv;
outlink->w = s->w;
outlink->h = s->h;
outlink->sample_aspect_ratio = (AVRational){1,1};
outlink->frame_rate = s->frame_rate;
if (!strcmp(s
->mpc_str
, "none")) s->draw_median_phase = 0;
else if (av_parse_color(s->mpc, s->mpc_str, -1, ctx) >= 0)
s->draw_median_phase = 1;
else
return AVERROR(EINVAL);
return 0;
}
static inline int get_x(float phase, int w)
{
return (phase + 1.) / 2. * (w - 1);
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
AudioPhaseMeterContext *s = ctx->priv;
AVDictionary **metadata;
const int rc = s->contrast[0];
const int gc = s->contrast[1];
const int bc = s->contrast[2];
float fphase = 0;
AVFrame *out;
uint8_t *dst;
int i;
if (!s->out || s->out->width != outlink->w ||
s->out->height != outlink->h) {
av_frame_free(&s->out);
s->out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!s->out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
out = s->out;
for (i = 0; i < outlink->h; i++)
memset(out
->data
[0] + i
* out
->linesize
[0], 0, outlink
->w
* 4); } else {
out = s->out;
for (i = outlink->h - 1; i >= 10; i--)
memmove(out
->data
[0] + (i
) * out
->linesize
[0], out->data[0] + (i-1) * out->linesize[0],
outlink->w * 4);
for (i = 0; i < outlink->w; i++)
AV_WL32(out->data[0] + i * 4, 0);
}
s->out->pts = in->pts;
for (i = 0; i < in->nb_samples; i++) {
const float *src = (float *)in->data[0] + i * 2;
const float f = src[0] * src[1] / (src[0]*src[0] + src[1] * src[1]) * 2;
const float phase = isnan(f) ? 1 : f;
const int x = get_x(phase, s->w);
dst = out->data[0] + x * 4;
dst[0] = FFMIN(255, dst[0] + rc);
dst[1] = FFMIN(255, dst[1] + gc);
dst[2] = FFMIN(255, dst[2] + bc);
dst[3] = 255;
fphase += phase;
}
fphase /= in->nb_samples;
if (s->draw_median_phase) {
dst = out->data[0] + get_x(fphase, s->w) * 4;
AV_WL32(dst, AV_RL32(s->mpc));
}
for (i = 1; i < 10 && i < outlink->h; i++)
memcpy(out
->data
[0] + i
* out
->linesize
[0], out
->data
[0], outlink
->w
* 4);
metadata = avpriv_frame_get_metadatap(out);
if (metadata) {
uint8_t value[128];
snprintf(value
, sizeof(value
), "%f", fphase
); av_dict_set(metadata, "lavfi.aphasemeter.phase", value, 0);
}
av_frame_free(&in);
return ff_filter_frame(outlink, av_frame_clone(s->out));
}
static av_cold void uninit(AVFilterContext *ctx)
{
AudioPhaseMeterContext *s = ctx->priv;
av_frame_free(&s->out);
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
AVFilter ff_avf_aphasemeter = {
.name = "aphasemeter",
.description = NULL_IF_CONFIG_SMALL("Convert input audio to phase meter video output."),
.uninit = uninit,
.query_formats = query_formats,
.priv_size = sizeof(AudioPhaseMeterContext),
.inputs = inputs,
.outputs = outputs,
.priv_class = &aphasemeter_class,
};