/*
* 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
*/
#include "libavutil/channel_layout.h"
#include "libavutil/eval.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/xga_font_data.h"
#include "avfilter.h"
#include "formats.h"
#include "audio.h"
#include "video.h"
#include "internal.h"
typedef struct ShowVolumeContext {
const AVClass *class;
int w, h;
int f, b;
AVRational frame_rate;
char *color;
AVFrame *out;
AVExpr *c_expr;
int draw_text;
} ShowVolumeContext;
#define OFFSET(x) offsetof(ShowVolumeContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption showvolume_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 },
{ "b", "set border width", OFFSET(b), AV_OPT_TYPE_INT, {.i64=1}, 0, 5, FLAGS },
{ "w", "set channel width", OFFSET(w), AV_OPT_TYPE_INT, {.i64=400}, 40, 1080, FLAGS },
{ "h", "set channel height", OFFSET(h), AV_OPT_TYPE_INT, {.i64=20}, 1, 100, FLAGS },
{ "f", "set fade", OFFSET(f), AV_OPT_TYPE_INT, {.i64=20}, 1, 255, FLAGS },
{ "c", "set volume color expression", OFFSET(color), AV_OPT_TYPE_STRING, {.str="if(gte(VOLUME,-2), if(gte(VOLUME,-1),0xff0000ff, 0xff00ffff),0xff00ff00)"}, 0, 0, FLAGS },
{ "t", "display channel names", OFFSET(draw_text), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(showvolume);
static const char *const var_names[] = { "VOLUME", "CHANNEL", NULL };
enum { VAR_VOLUME, VAR_CHANNEL, VAR_VARS_NB };
static av_cold int init(AVFilterContext *ctx)
{
ShowVolumeContext *s = ctx->priv;
int ret;
if (s->color) {
ret = av_expr_parse(&s->c_expr, s->color, var_names,
NULL, NULL, NULL, NULL, 0, ctx);
if (ret < 0)
return ret;
}
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *formats = NULL;
AVFilterChannelLayouts *layouts = NULL;
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, 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);
layouts = ff_all_channel_layouts();
if (!layouts)
return AVERROR(ENOMEM);
ff_channel_layouts_ref(layouts, &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;
ShowVolumeContext *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)
{
ShowVolumeContext *s = outlink->src->priv;
AVFilterLink *inlink = outlink->src->inputs[0];
outlink->w = s->w;
outlink->h = s->h * inlink->channels + (inlink->channels - 1) * s->b;
outlink->sample_aspect_ratio = (AVRational){1,1};
outlink->frame_rate = s->frame_rate;
return 0;
}
static void drawtext(AVFrame *pic, int x, int y, const char *txt)
{
const uint8_t *font;
int font_height;
int i;
font = avpriv_cga_font, font_height = 8;
for (i = 0; txt[i]; i++) {
int char_y, mask;
uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8)*4;
for (char_y = 0; char_y < font_height; char_y++) {
for (mask = 0x80; mask; mask >>= 1) {
if (font[txt[i] * font_height + char_y] & mask)
AV_WN32(p, ~AV_RN32(p));
p += 4;
}
p += pic->linesize[0] - 8*4;
}
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
ShowVolumeContext *s = ctx->priv;
int c, i, j, k;
double values[VAR_VARS_NB];
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(&insamples);
return AVERROR(ENOMEM);
}
for (i = 0; i < outlink->h; i++)
memset(s
->out
->data
[0] + i
* s
->out
->linesize
[0], 0, outlink
->w
* 4); }
s->out->pts = insamples->pts;
for (j = 0; j < outlink->h; j++) {
uint8_t *dst = s->out->data[0] + j * s->out->linesize[0];
for (k = 0; k < s->w; k++) {
dst[k * 4 + 0] = FFMAX(dst[k * 4 + 0] - s->f, 0);
dst[k * 4 + 1] = FFMAX(dst[k * 4 + 1] - s->f, 0);
dst[k * 4 + 2] = FFMAX(dst[k * 4 + 2] - s->f, 0);
dst[k * 4 + 3] = FFMAX(dst[k * 4 + 3] - s->f, 0);
}
}
for (c = 0; c < inlink->channels; c++) {
float *src = (float *)insamples->extended_data[c];
float max = 0;
uint32_t color;
for (i = 0; i < insamples->nb_samples; i++)
max = FFMAX(max, src[i]);
max = av_clipf(max, 0, 1);
values
[VAR_VOLUME
] = 20.0 * log(max
) / M_LN10
; values[VAR_CHANNEL] = c;
color = av_expr_eval(s->c_expr, values, NULL);
for (j = 0; j < s->h; j++) {
uint8_t *dst = s->out->data[0] + (c * s->h + c * s->b + j) * s->out->linesize[0];
for (k = 0; k < s->w * max; k++)
AV_WN32A(dst + k * 4, color);
}
if (s->h >= 8 && s->draw_text)
drawtext(s->out, 2, c * (s->h + s->b) + (s->h - 8) / 2,
av_get_channel_name(av_channel_layout_extract_channel(insamples->channel_layout, c)));
}
av_frame_free(&insamples);
return ff_filter_frame(outlink, av_frame_clone(s->out));
}
static av_cold void uninit(AVFilterContext *ctx)
{
ShowVolumeContext *s = ctx->priv;
av_frame_free(&s->out);
av_expr_free(s->c_expr);
}
static const AVFilterPad showvolume_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad showvolume_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
AVFilter ff_avf_showvolume = {
.name = "showvolume",
.description = NULL_IF_CONFIG_SMALL("Convert input audio volume to video output."),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.priv_size = sizeof(ShowVolumeContext),
.inputs = showvolume_inputs,
.outputs = showvolume_outputs,
.priv_class = &showvolume_class,
};