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FFmpeg4/libavfilter/avf_showvolume.c

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/*
* 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/avstring.h"
#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 "filters.h"
#include "formats.h"
#include "audio.h"
#include "video.h"
#include "internal.h"
static const char *const var_names[] = { "VOLUME", "CHANNEL", "PEAK", NULL };
enum { VAR_VOLUME, VAR_CHANNEL, VAR_PEAK, VAR_VARS_NB };
enum DisplayScale { LINEAR, LOG, NB_DISPLAY_SCALE };
typedef struct ShowVolumeContext {
const AVClass *class;
int w, h;
int b;
double f;
AVRational frame_rate;
char *color;
int orientation;
int step;
float bgopacity;
int mode;
int nb_samples;
AVFrame *out;
AVExpr *c_expr;
int draw_text;
int draw_volume;
double *values;
uint32_t *color_lut;
float *max;
float rms_factor;
int display_scale;
double draw_persistent_duration; /* in second */
uint8_t persistant_max_rgba[4];
int persistent_max_frames; /* number of frames to check max value */
float *max_persistent; /* max value for draw_persistent_max for each channel */
int *nb_frames_max_display; /* number of frame for each channel, for displaying the max value */
void (*meter)(float *src, int nb_samples, float *max, float factor);
} 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, INT_MAX, FLAGS },
{ "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, 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}, 80, 8192, FLAGS },
{ "h", "set channel height", OFFSET(h), AV_OPT_TYPE_INT, {.i64=20}, 1, 900, FLAGS },
{ "f", "set fade", OFFSET(f), AV_OPT_TYPE_DOUBLE, {.dbl=0.95}, 0, 1, FLAGS },
{ "c", "set volume color expression", OFFSET(color), AV_OPT_TYPE_STRING, {.str="PEAK*255+floor((1-PEAK)*255)*256+0xff000000"}, 0, 0, FLAGS },
{ "t", "display channel names", OFFSET(draw_text), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ "v", "display volume value", OFFSET(draw_volume), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ "dm", "duration for max value display", OFFSET(draw_persistent_duration), AV_OPT_TYPE_DOUBLE, {.dbl=0.}, 0, 9000, FLAGS},
{ "dmc","set color of the max value line", OFFSET(persistant_max_rgba), AV_OPT_TYPE_COLOR, {.str = "orange"}, 0, 0, FLAGS },
{ "o", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "orientation" },
{ "h", "horizontal", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "orientation" },
{ "v", "vertical", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "orientation" },
{ "s", "set step size", OFFSET(step), AV_OPT_TYPE_INT, {.i64=0}, 0, 5, FLAGS },
{ "p", "set background opacity", OFFSET(bgopacity), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 1, FLAGS },
{ "m", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "mode" },
{ "p", "peak", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode" },
{ "r", "rms", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
{ "ds", "set display scale", OFFSET(display_scale), AV_OPT_TYPE_INT, {.i64=LINEAR}, LINEAR, NB_DISPLAY_SCALE - 1, FLAGS, "display_scale" },
{ "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "display_scale" },
{ "log", "log", 0, AV_OPT_TYPE_CONST, {.i64=LOG}, 0, 0, FLAGS, "display_scale" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(showvolume);
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 };
int ret;
formats = ff_make_format_list(sample_fmts);
if ((ret = ff_formats_ref(formats, &inlink->out_formats)) < 0)
return ret;
layouts = ff_all_channel_counts();
if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0)
return ret;
formats = ff_all_samplerates();
if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0)
return ret;
formats = ff_make_format_list(pix_fmts);
if ((ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)
return ret;
return 0;
}
static void find_peak(float *src, int nb_samples, float *peak, float factor)
{
int i;
*peak = 0;
for (i = 0; i < nb_samples; i++)
*peak = FFMAX(*peak, FFABS(src[i]));
}
static void find_rms(float *src, int nb_samples, float *rms, float factor)
{
int i;
for (i = 0; i < nb_samples; i++)
*rms += factor * (src[i] * src[i] - *rms);
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
ShowVolumeContext *s = ctx->priv;
s->nb_samples = FFMAX(1, av_rescale(inlink->sample_rate, s->frame_rate.den, s->frame_rate.num));
s->values = av_calloc(inlink->channels * VAR_VARS_NB, sizeof(double));
if (!s->values)
return AVERROR(ENOMEM);
s->color_lut = av_calloc(s->w, sizeof(*s->color_lut) * inlink->channels);
if (!s->color_lut)
return AVERROR(ENOMEM);
s->max = av_calloc(inlink->channels, sizeof(*s->max));
if (!s->max)
return AVERROR(ENOMEM);
s->rms_factor = 10000. / inlink->sample_rate;
switch (s->mode) {
case 0: s->meter = find_peak; break;
case 1: s->meter = find_rms; break;
default: return AVERROR_BUG;
}
if (s->draw_persistent_duration > 0.) {
s->persistent_max_frames = (int) FFMAX(av_q2d(s->frame_rate) * s->draw_persistent_duration, 1.);
s->max_persistent = av_calloc(inlink->channels * s->persistent_max_frames, sizeof(*s->max_persistent));
s->nb_frames_max_display = av_calloc(inlink->channels * s->persistent_max_frames, sizeof(*s->nb_frames_max_display));
}
return 0;
}
static int config_output(AVFilterLink *outlink)
{
ShowVolumeContext *s = outlink->src->priv;
AVFilterLink *inlink = outlink->src->inputs[0];
int ch;
if (s->orientation) {
outlink->h = s->w;
outlink->w = s->h * inlink->channels + (inlink->channels - 1) * s->b;
} else {
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;
for (ch = 0; ch < inlink->channels; ch++) {
int i;
for (i = 0; i < s->w; i++) {
float max = i / (float)(s->w - 1);
s->values[ch * VAR_VARS_NB + VAR_PEAK] = max;
s->values[ch * VAR_VARS_NB + VAR_VOLUME] = 20.0 * log10(max);
s->values[ch * VAR_VARS_NB + VAR_CHANNEL] = ch;
s->color_lut[ch * s->w + i] = av_expr_eval(s->c_expr, &s->values[ch * VAR_VARS_NB], NULL);
}
}
return 0;
}
static void drawtext(AVFrame *pic, int x, int y, const char *txt, int o)
{
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;
if (o) { /* vertical orientation */
for (char_y = font_height - 1; char_y >= 0; char_y--) {
uint8_t *p = pic->data[0] + (y + i * 10) * pic->linesize[0] + x * 4;
for (mask = 0x80; mask; mask >>= 1) {
if (font[txt[i] * font_height + font_height - 1 - char_y] & mask)
AV_WN32(&p[char_y * 4], ~AV_RN32(&p[char_y * 4]));
p += pic->linesize[0];
}
}
} else { /* horizontal orientation */
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 void clear_picture(ShowVolumeContext *s, AVFilterLink *outlink)
{
int i, j;
const uint32_t bg = (uint32_t)(s->bgopacity * 255) << 24;
for (i = 0; i < outlink->h; i++) {
uint32_t *dst = (uint32_t *)(s->out->data[0] + i * s->out->linesize[0]);
for (j = 0; j < outlink->w; j++)
AV_WN32A(dst + j, bg);
}
}
static inline int calc_max_draw(ShowVolumeContext *s, AVFilterLink *outlink, float max)
{
float max_val;
if (s->display_scale == LINEAR) {
max_val = max;
} else { /* log */
max_val = av_clipf(0.21 * log10(max) + 1, 0, 1);
}
if (s->orientation) { /* vertical */
return outlink->h - outlink->h * max_val;
} else { /* horizontal */
return s->w * max_val;
}
}
static inline void calc_persistent_max(ShowVolumeContext *s, float max, int channel)
{
/* update max value for persistent max display */
if ((max >= s->max_persistent[channel]) || (s->nb_frames_max_display[channel] >= s->persistent_max_frames)) { /* update max value for display */
s->max_persistent[channel] = max;
s->nb_frames_max_display[channel] = 0;
} else {
s->nb_frames_max_display[channel] += 1; /* incremente display frame count */
}
}
static inline void draw_max_line(ShowVolumeContext *s, int max_draw, int channel)
{
int k;
if (s->orientation) { /* vertical */
uint8_t *dst = s->out->data[0] + max_draw * s->out->linesize[0] + channel * (s->b + s->h) * 4;
for (k = 0; k < s->h; k++) {
memcpy(dst + k * 4, s->persistant_max_rgba, sizeof(s->persistant_max_rgba));
}
} else { /* horizontal */
for (k = 0; k < s->h; k++) {
uint8_t *dst = s->out->data[0] + (channel * s->h + channel * s->b + k) * s->out->linesize[0];
memcpy(dst + max_draw * 4, s->persistant_max_rgba, sizeof(s->persistant_max_rgba));
}
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
ShowVolumeContext *s = ctx->priv;
const int step = s->step;
int c, j, k, max_draw;
AVFrame *out;
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);
}
clear_picture(s, outlink);
}
s->out->pts = insamples->pts;
if ((s->f < 1.) && (s->f > 0.)) {
for (j = 0; j < outlink->h; j++) {
uint8_t *dst = s->out->data[0] + j * s->out->linesize[0];
const uint32_t alpha = s->bgopacity * 255;
for (k = 0; k < outlink->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, alpha);
}
}
} else if (s->f == 0.) {
clear_picture(s, outlink);
}
if (s->orientation) { /* vertical */
for (c = 0; c < inlink->channels; c++) {
float *src = (float *)insamples->extended_data[c];
uint32_t *lut = s->color_lut + s->w * c;
float max;
s->meter(src, insamples->nb_samples, &s->max[c], s->rms_factor);
max = s->max[c];
s->values[c * VAR_VARS_NB + VAR_VOLUME] = 20.0 * log10(max);
max = av_clipf(max, 0, 1);
max_draw = calc_max_draw(s, outlink, max);
for (j = max_draw; j < s->w; j++) {
uint8_t *dst = s->out->data[0] + j * s->out->linesize[0] + c * (s->b + s->h) * 4;
for (k = 0; k < s->h; k++) {
AV_WN32A(&dst[k * 4], lut[s->w - j - 1]);
if (j & step)
j += step;
}
}
if (s->h >= 8 && s->draw_text) {
const char *channel_name = av_get_channel_name(av_channel_layout_extract_channel(insamples->channel_layout, c));
if (!channel_name)
continue;
drawtext(s->out, c * (s->h + s->b) + (s->h - 10) / 2, outlink->h - 35, channel_name, 1);
}
if (s->draw_persistent_duration > 0.) {
calc_persistent_max(s, max, c);
max_draw = FFMAX(0, calc_max_draw(s, outlink, s->max_persistent[c]) - 1);
draw_max_line(s, max_draw, c);
}
}
} else { /* horizontal */
for (c = 0; c < inlink->channels; c++) {
float *src = (float *)insamples->extended_data[c];
uint32_t *lut = s->color_lut + s->w * c;
float max;
s->meter(src, insamples->nb_samples, &s->max[c], s->rms_factor);
max = s->max[c];
s->values[c * VAR_VARS_NB + VAR_VOLUME] = 20.0 * log10(max);
max = av_clipf(max, 0, 1);
max_draw = calc_max_draw(s, outlink, max);
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 < max_draw; k++) {
AV_WN32A(dst + k * 4, lut[k]);
if (k & step)
k += step;
}
}
if (s->h >= 8 && s->draw_text) {
const char *channel_name = av_get_channel_name(av_channel_layout_extract_channel(insamples->channel_layout, c));
if (!channel_name)
continue;
drawtext(s->out, 2, c * (s->h + s->b) + (s->h - 8) / 2, channel_name, 0);
}
if (s->draw_persistent_duration > 0.) {
calc_persistent_max(s, max, c);
max_draw = FFMAX(0, calc_max_draw(s, outlink, s->max_persistent[c]) - 1);
draw_max_line(s, max_draw, c);
}
}
}
av_frame_free(&insamples);
out = av_frame_clone(s->out);
if (!out)
return AVERROR(ENOMEM);
av_frame_make_writable(out);
/* draw volume level */
for (c = 0; c < inlink->channels && s->h >= 8 && s->draw_volume; c++) {
char buf[16];
if (s->orientation) { /* vertical */
snprintf(buf, sizeof(buf), "%.2f", s->values[c * VAR_VARS_NB + VAR_VOLUME]);
drawtext(out, c * (s->h + s->b) + (s->h - 8) / 2, 2, buf, 1);
} else { /* horizontal */
snprintf(buf, sizeof(buf), "%.2f", s->values[c * VAR_VARS_NB + VAR_VOLUME]);
drawtext(out, FFMAX(0, s->w - 8 * (int)strlen(buf)), c * (s->h + s->b) + (s->h - 8) / 2, buf, 0);
}
}
return ff_filter_frame(outlink, out);
}
static int activate(AVFilterContext *ctx)
{
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
ShowVolumeContext *s = ctx->priv;
AVFrame *in = NULL;
int ret;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
ret = ff_inlink_consume_samples(inlink, s->nb_samples, s->nb_samples, &in);
if (ret < 0)
return ret;
if (ret > 0)
return filter_frame(inlink, in);
FF_FILTER_FORWARD_STATUS(inlink, outlink);
FF_FILTER_FORWARD_WANTED(outlink, inlink);
return FFERROR_NOT_READY;
}
static av_cold void uninit(AVFilterContext *ctx)
{
ShowVolumeContext *s = ctx->priv;
av_frame_free(&s->out);
av_expr_free(s->c_expr);
av_freep(&s->values);
av_freep(&s->color_lut);
av_freep(&s->max);
}
static const AVFilterPad showvolume_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_input,
},
{ 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,
.activate = activate,
.uninit = uninit,
.query_formats = query_formats,
.priv_size = sizeof(ShowVolumeContext),
.inputs = showvolume_inputs,
.outputs = showvolume_outputs,
.priv_class = &showvolume_class,
};
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