From: Wang Cao <wangcao-at-google.com@ffmpeg.org>
To: ffmpeg-devel@ffmpeg.org
Cc: Wang Cao <wangcao@google.com>
Subject: [FFmpeg-devel] [PATCH] avfilter/alimiter: Remove the delay introduced by lookahead buffer
Date: Wed, 30 Mar 2022 14:03:15 -0700
Message-ID: <20220330210314.2055201-1-wangcao@google.com> (raw)
In-Reply-To: <2ec3971d-f698-1369-1ace-eac613afc980@passwd.hu>
The change essentially removes the delay introduces by lookahead buffer.
The valid audio data in the internal buffer is also flushed to ensure
the integrity of output.
Signed-off-by: Wang Cao <wangcao@google.com>
---
doc/filters.texi | 2 -
libavfilter/af_alimiter.c | 97 +++++-
tests/ref/fate/filter-alimiter | 518 ++++++++++++++++-----------------
3 files changed, 344 insertions(+), 273 deletions(-)
Thanks a lot for your time to review my patch. I have made "zero_delay"
option to default. Now the output samples will only be written after the
lookahead buffer is full. We also uses "request_frame" to flush the
internal buffers so that all valid input audio samples are written.
diff --git a/doc/filters.texi b/doc/filters.texi
index d70ac3e237..5d1adf88e1 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1943,8 +1943,6 @@ aiir=z=1.3057 0 0 0:p=1.3057 2.3892 2.1860 1:f=sf:r=d
The limiter prevents an input signal from rising over a desired threshold.
This limiter uses lookahead technology to prevent your signal from distorting.
-It means that there is a small delay after the signal is processed. Keep in mind
-that the delay it produces is the attack time you set.
The filter accepts the following options:
diff --git a/libavfilter/af_alimiter.c b/libavfilter/af_alimiter.c
index 133f98f165..e1fcf98574 100644
--- a/libavfilter/af_alimiter.c
+++ b/libavfilter/af_alimiter.c
@@ -30,6 +30,7 @@
#include "audio.h"
#include "avfilter.h"
+#include "bufferqueue.h"
#include "formats.h"
#include "internal.h"
@@ -55,6 +56,13 @@ typedef struct AudioLimiterContext {
int *nextpos;
double *nextdelta;
+ int total_samples_to_flush;
+ int lookahead_buffer_full;
+
+ struct FFBufQueue output_frame_queue;
+ int output_sample_pos;
+ int output_frame_pos;
+
double delta;
int nextiter;
int nextlen;
@@ -129,6 +137,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
AVFrame *out;
double *buf;
int n, c, i;
+ int can_free_input_frame = 0;
+ double peak = 0;
if (av_frame_is_writable(in)) {
out = in;
@@ -138,12 +148,23 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
av_frame_free(&in);
return AVERROR(ENOMEM);
}
+ can_free_input_frame = 1;
av_frame_copy_props(out, in);
}
- dst = (double *)out->data[0];
+
+ if (ff_bufqueue_is_full(&s->output_frame_queue)) {
+ // In the runtime, the total number of frames in the queue is bounded by
+ // attack_time, sample rate and frame size.
+ return AVERROR_BUG;
+ }
+
+ ff_bufqueue_add(ctx, &s->output_frame_queue, out);
for (n = 0; n < in->nb_samples; n++) {
- double peak = 0;
+ out = ff_bufqueue_peek(&s->output_frame_queue, s->output_frame_pos);
+ dst = (double *)out->data[0];
+ dst += s->output_sample_pos * channels;
+ peak = 0;
for (c = 0; c < channels; c++) {
double sample = src[c] * level_in;
@@ -213,8 +234,21 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
s->att += s->delta;
- for (c = 0; c < channels; c++)
- dst[c] = buf[c] * s->att;
+ // Checks lookahead buffer (s->buffer) has been filled
+ if (!s->lookahead_buffer_full && (s->pos + channels) % buffer_size == 0) {
+ s->lookahead_buffer_full = 1;
+ }
+ if (s->lookahead_buffer_full) {
+ for (c = 0; c < channels; c++) {
+ dst[c] = buf[c] * s->att;
+ dst[c] = av_clipd(dst[c], -limit, limit) * level * level_out;
+ }
+ s->output_sample_pos++;
+ if (s->output_sample_pos == out->nb_samples) {
+ s->output_frame_pos++;
+ s->output_sample_pos = 0;
+ }
+ }
if ((s->pos + channels) % buffer_size == nextpos[s->nextiter]) {
if (s->auto_release) {
@@ -261,18 +295,55 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
if (s->delta != 0. && fabs(s->delta) < 0.00000000000001)
s->delta = 0.;
- for (c = 0; c < channels; c++)
- dst[c] = av_clipd(dst[c], -limit, limit) * level * level_out;
-
s->pos = (s->pos + channels) % buffer_size;
src += channels;
- dst += channels;
}
-
- if (in != out)
+ if (can_free_input_frame) {
av_frame_free(&in);
+ }
- return ff_filter_frame(outlink, out);
+ if (s->output_frame_pos > 0) {
+ s->output_frame_pos--;
+ out = ff_bufqueue_get(&s->output_frame_queue);
+ return ff_filter_frame(outlink, out);
+ }
+ return 0;
+}
+
+static int request_frame(AVFilterLink* outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ AudioLimiterContext *s = (AudioLimiterContext*)ctx->priv;
+ int ret;
+ AVFilterLink *inlink;
+ AVFrame *out;
+ AVFrame *silence_frame;
+
+ ret = ff_request_frame(ctx->inputs[0]);
+
+ if (ret != AVERROR_EOF || s->total_samples_to_flush == 0) {
+ // Not necessarily an error, just not EOF.
+ return ret;
+ }
+
+ // Flush the frames in the internal buffer
+ if (s->output_frame_pos > 0) {
+ out = ff_bufqueue_get(&s->output_frame_queue);
+ s->output_frame_pos--;
+ return ff_filter_frame(outlink, out);
+ }
+
+ // We reach here when input filters have finished producing data (i.e. EOF),
+ // but because of the attack param, s->buffer still has meaningful
+ // audio content that needs flushing.
+ inlink = ctx->inputs[0];
+ // Pushes silence frame to flush valid audio in the s->buffer
+ silence_frame = ff_get_audio_buffer(inlink, s->total_samples_to_flush);
+ ret = filter_frame(inlink, silence_frame);
+ if (ret < 0) {
+ return ret;
+ }
+ return AVERROR_EOF;
}
static int config_input(AVFilterLink *inlink)
@@ -292,7 +363,8 @@ static int config_input(AVFilterLink *inlink)
return AVERROR(ENOMEM);
memset(s->nextpos, -1, obuffer_size * sizeof(*s->nextpos));
- s->buffer_size = inlink->sample_rate * s->attack * inlink->ch_layout.nb_channels;
+ s->total_samples_to_flush = inlink->sample_rate * s->attack;
+ s->buffer_size = s->total_samples_to_flush * inlink->ch_layout.nb_channels;
s->buffer_size -= s->buffer_size % inlink->ch_layout.nb_channels;
if (s->buffer_size <= 0) {
@@ -325,6 +397,7 @@ static const AVFilterPad alimiter_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
+ .request_frame = request_frame,
},
};
diff --git a/tests/ref/fate/filter-alimiter b/tests/ref/fate/filter-alimiter
index 56cfb614da..93daba92c6 100644
--- a/tests/ref/fate/filter-alimiter
+++ b/tests/ref/fate/filter-alimiter
@@ -3,262 +3,262 @@
#codec_id 0: pcm_s16le
#sample_rate 0: 44100
#channel_layout_name 0: stereo
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--
2.35.1.1094.g7c7d902a7c-goog
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next prev parent reply other threads:[~2022-03-30 21:05 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-27 6:08 [FFmpeg-devel] [PATCH] avfilter/alimiter: Add "flush_buffer" option to flush the remaining valid data to the output Wang Cao
2022-03-27 21:40 ` Marton Balint
2022-03-30 21:03 ` Wang Cao [this message]
2022-04-04 15:46 ` [FFmpeg-devel] [PATCH] avfilter/alimiter: Remove the delay introduced by lookahead buffer Paul B Mahol
2022-04-04 15:49 ` [FFmpeg-devel] [PATCH] avfilter/alimiter: Add "flush_buffer" option to flush the remaining valid data to the output Paul B Mahol
2022-04-04 22:28 ` Marton Balint
2022-04-05 18:56 ` Wang Cao
2022-04-06 11:49 ` Paul B Mahol
2022-04-07 7:46 ` Paul B Mahol
2022-04-07 21:56 ` Wang Cao
2022-04-08 18:42 ` Paul B Mahol
2022-04-08 20:41 ` Wang Cao
2022-04-09 12:37 ` Paul B Mahol
2022-04-11 20:59 ` Wang Cao
2022-04-12 19:42 ` Paul B Mahol
2022-04-13 4:11 ` Wang Cao
2022-04-15 18:49 ` [FFmpeg-devel] [PATCH] avfilter/alimiter: Add an option "comp_delay" that removes the delay introduced by lookahead buffer Wang Cao
2022-04-29 20:48 ` Wang Cao
2022-05-02 8:26 ` Paul B Mahol
2022-05-05 21:14 ` [FFmpeg-devel] [PATCH] avfilter/alimiter:add latency compensation Wang Cao
2022-05-10 22:45 ` Wang Cao
2022-05-12 12:05 ` Paul B Mahol
2022-05-05 21:17 ` [FFmpeg-devel] [PATCH] avfilter/alimiter: Add an option "comp_delay" that removes the delay introduced by lookahead buffer Wang Cao
2022-04-15 18:51 ` [FFmpeg-devel] [PATCH] avfilter/alimiter: Add "flush_buffer" option to flush the remaining valid data to the output Wang Cao
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