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/*
* Copyright (c) 2022 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/mem.h"
#include "libavutil/opt.h"
#include "libavutil/tx.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include <float.h>
typedef struct AudioDialogueEnhancementContext {
const AVClass *class;
double original, enhance, voice;
int fft_size;
int overlap;
void *window;
float *window_float;
double *window_double;
float prev_vad_float;
double prev_vad_double;
AVFrame *in;
AVFrame *in_frame;
AVFrame *out_dist_frame;
AVFrame *windowed_frame;
AVFrame *windowed_out;
AVFrame *windowed_prev;
AVFrame *center_frame;
int (*de_stereo)(AVFilterContext *ctx, AVFrame *out);
AVTXContext *tx_ctx[2], *itx_ctx;
av_tx_fn tx_fn, itx_fn;
} AudioDialogueEnhanceContext;
#define OFFSET(x) offsetof(AudioDialogueEnhanceContext, x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption dialoguenhance_options[] = {
{ "original", "set original center factor", OFFSET(original), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },
{ "enhance", "set dialogue enhance factor",OFFSET(enhance), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 3, FLAGS },
{ "voice", "set voice detection factor", OFFSET(voice), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 2,32, FLAGS },
{NULL}
};
AVFILTER_DEFINE_CLASS(dialoguenhance);
static int query_formats(const AVFilterContext *ctx,
AVFilterFormatsConfig **cfg_in,
AVFilterFormatsConfig **cfg_out)
{
static const enum AVSampleFormat formats[] = {
AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_DBLP,
AV_SAMPLE_FMT_NONE,
};
AVFilterChannelLayouts *in_layout = NULL, *out_layout = NULL;
int ret;
ret = ff_set_common_formats_from_list2(ctx, cfg_in, cfg_out, formats);
if (ret < 0)
return ret;
if ((ret = ff_add_channel_layout (&in_layout , &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO)) < 0 ||
(ret = ff_channel_layouts_ref(in_layout, &cfg_in[0]->channel_layouts)) < 0 ||
(ret = ff_add_channel_layout (&out_layout , &(AVChannelLayout)AV_CHANNEL_LAYOUT_SURROUND)) < 0 ||
(ret = ff_channel_layouts_ref(out_layout, &cfg_out[0]->channel_layouts)) < 0)
return ret;
return 0;
}
#define DEPTH 32
#include "dialoguenhance_template.c"
#undef DEPTH
#define DEPTH 64
#include "dialoguenhance_template.c"
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
AudioDialogueEnhanceContext *s = ctx->priv;
int ret;
s->fft_size = inlink->sample_rate > 100000 ? 8192 : inlink->sample_rate > 50000 ? 4096 : 2048;
s->overlap = s->fft_size / 4;
s->in_frame = ff_get_audio_buffer(inlink, (s->fft_size + 2) * 2);
s->center_frame = ff_get_audio_buffer(inlink, (s->fft_size + 2) * 2);
s->out_dist_frame = ff_get_audio_buffer(inlink, (s->fft_size + 2) * 2);
s->windowed_frame = ff_get_audio_buffer(inlink, (s->fft_size + 2) * 2);
s->windowed_out = ff_get_audio_buffer(inlink, (s->fft_size + 2) * 2);
s->windowed_prev = ff_get_audio_buffer(inlink, (s->fft_size + 2) * 2);
if (!s->in_frame || !s->windowed_out || !s->windowed_prev ||
!s->out_dist_frame || !s->windowed_frame || !s->center_frame)
return AVERROR(ENOMEM);
switch (inlink->format) {
case AV_SAMPLE_FMT_FLTP:
s->de_stereo = de_stereo_float;
ret = de_tx_init_float(ctx);
break;
case AV_SAMPLE_FMT_DBLP:
s->de_stereo = de_stereo_double;
ret = de_tx_init_double(ctx);
break;
}
return ret;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
AudioDialogueEnhanceContext *s = ctx->priv;
AVFrame *out;
int ret;
out = ff_get_audio_buffer(outlink, s->overlap);
if (!out) {
ret = AVERROR(ENOMEM);
goto fail;
}
s->in = in;
s->de_stereo(ctx, out);
av_frame_copy_props(out, in);
out->nb_samples = in->nb_samples;
ret = ff_filter_frame(outlink, out);
fail:
av_frame_free(&in);
s->in = NULL;
return ret < 0 ? ret : 0;
}
static int activate(AVFilterContext *ctx)
{
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
AudioDialogueEnhanceContext *s = ctx->priv;
AVFrame *in = NULL;
int ret = 0, status;
int64_t pts;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
ret = ff_inlink_consume_samples(inlink, s->overlap, s->overlap, &in);
if (ret < 0)
return ret;
if (ret > 0) {
return filter_frame(inlink, in);
} else if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
ff_outlink_set_status(outlink, status, pts);
return 0;
} else {
if (ff_inlink_queued_samples(inlink) >= s->overlap) {
ff_filter_set_ready(ctx, 10);
} else if (ff_outlink_frame_wanted(outlink)) {
ff_inlink_request_frame(inlink);
}
return 0;
}
}
static av_cold void uninit(AVFilterContext *ctx)
{
AudioDialogueEnhanceContext *s = ctx->priv;
av_freep(&s->window);
av_frame_free(&s->in_frame);
av_frame_free(&s->center_frame);
av_frame_free(&s->out_dist_frame);
av_frame_free(&s->windowed_frame);
av_frame_free(&s->windowed_out);
av_frame_free(&s->windowed_prev);
av_tx_uninit(&s->tx_ctx[0]);
av_tx_uninit(&s->tx_ctx[1]);
av_tx_uninit(&s->itx_ctx);
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_input,
},
};
const AVFilter ff_af_dialoguenhance = {
.name = "dialoguenhance",
.description = NULL_IF_CONFIG_SMALL("Audio Dialogue Enhancement."),
.priv_size = sizeof(AudioDialogueEnhanceContext),
.priv_class = &dialoguenhance_class,
.uninit = uninit,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(ff_audio_default_filterpad),
FILTER_QUERY_FUNC2(query_formats),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
.activate = activate,
.process_command = ff_filter_process_command,
};
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