On Wed, Mar 30, 2022 at 11:05 PM Wang Cao <wangcao-at-google....@ffmpeg.org>
wrote:
> 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.
>
>
This adds extra delay, and complicates current code a lot.
> Signed-off-by: Wang Cao <wang...@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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