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avfilter/avf_showcwt: reduce latency/delay in some cases

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This commit is contained in:
Paul B Mahol 2023-08-03 21:41:53 +02:00
parent 5ff88bb7bc
commit 482a22e10f
1 changed files with 61 additions and 46 deletions
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107
libavfilter/avf_showcwt.c
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@ -250,13 +250,15 @@ static int query_formats(AVFilterContext *ctx)
return 0;
}
static void frequency_band(float *frequency_band, float factor,
int frequency_band_count,
float frequency_range,
float frequency_offset,
int frequency_scale, float deviation)
static float frequency_band(float *frequency_band,
int frequency_band_count,
float frequency_range,
float frequency_offset,
int frequency_scale, float deviation)
{
deviation *= sqrtf(1.f / (4.f * M_PI)); // Heisenberg Gabor Limit
float ret = 0.f;
deviation = sqrtf(deviation / (4.f * M_PI)); // Heisenberg Gabor Limit
for (int y = 0; y < frequency_band_count; y++) {
float frequency = frequency_range * (1.f - (float)y / frequency_band_count) + frequency_offset;
float frequency_derivative = frequency_range / frequency_band_count;
@ -292,9 +294,13 @@ static void frequency_band(float *frequency_band, float factor,
break;
}
frequency_band[y*2 ] = frequency * factor;
frequency_band[y*2+1] = frequency_derivative * deviation * factor;
frequency_band[y*2 ] = frequency;
frequency_band[y*2+1] = frequency_derivative * deviation;
ret = 1.f / (frequency_derivative * deviation);
}
return ret;
}
static float remap_log(ShowCWTContext *s, float value, int iscale, float log_factor)
@ -812,11 +818,52 @@ static int config_output(AVFilterLink *outlink)
break;
}
switch (s->frequency_scale) {
case FSCALE_LOG:
minimum_frequency = logf(minimum_frequency) / logf(2.f);
maximum_frequency = logf(maximum_frequency) / logf(2.f);
break;
case FSCALE_BARK:
minimum_frequency = 6.f * asinhf(minimum_frequency / 600.f);
maximum_frequency = 6.f * asinhf(maximum_frequency / 600.f);
break;
case FSCALE_MEL:
minimum_frequency = 2595.f * log10f(1.f + minimum_frequency / 700.f);
maximum_frequency = 2595.f * log10f(1.f + maximum_frequency / 700.f);
break;
case FSCALE_ERBS:
minimum_frequency = 11.17268f * logf(1.f + (46.06538f * minimum_frequency) / (minimum_frequency + 14678.49f));
maximum_frequency = 11.17268f * logf(1.f + (46.06538f * maximum_frequency) / (maximum_frequency + 14678.49f));
break;
case FSCALE_SQRT:
minimum_frequency = sqrtf(minimum_frequency);
maximum_frequency = sqrtf(maximum_frequency);
break;
case FSCALE_CBRT:
minimum_frequency = cbrtf(minimum_frequency);
maximum_frequency = cbrtf(maximum_frequency);
break;
case FSCALE_QDRT:
minimum_frequency = powf(minimum_frequency, 0.25f);
maximum_frequency = powf(maximum_frequency, 0.25f);
break;
}
s->frequency_band = av_calloc(s->frequency_band_count,
sizeof(*s->frequency_band) * 2);
if (!s->frequency_band)
return AVERROR(ENOMEM);
s->nb_consumed_samples = inlink->sample_rate *
frequency_band(s->frequency_band,
s->frequency_band_count, maximum_frequency - minimum_frequency,
minimum_frequency, s->frequency_scale, s->deviation);
s->nb_consumed_samples = FFMIN(s->nb_consumed_samples, 65536);
s->nb_threads = FFMIN(s->frequency_band_count, ff_filter_get_nb_threads(ctx));
s->nb_channels = inlink->ch_layout.nb_channels;
s->old_pts = AV_NOPTS_VALUE;
s->eof_pts = AV_NOPTS_VALUE;
s->nb_consumed_samples = FFMIN(inlink->sample_rate, 65536);
s->input_sample_count = 1 << (32 - ff_clz(s->nb_consumed_samples));
s->input_padding_size = 1 << (32 - ff_clz(s->input_sample_count));
@ -853,8 +900,6 @@ static int config_output(AVFilterLink *outlink)
return ret;
}
s->frequency_band = av_calloc(s->frequency_band_count,
sizeof(*s->frequency_band) * 2);
s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
s->fft_in = ff_get_audio_buffer(inlink, s->fft_size * 2);
s->fft_out = ff_get_audio_buffer(inlink, s->fft_size * 2);
@ -872,7 +917,7 @@ static int config_output(AVFilterLink *outlink)
s->kernel_stop = av_calloc(s->frequency_band_count, sizeof(*s->kernel_stop));
if (!s->outpicref || !s->fft_in || !s->fft_out || !s->src_x || !s->dst_x || !s->over ||
!s->ifft_in || !s->ifft_out || !s->kernel_start || !s->kernel_stop || !s->ch_out ||
!s->frequency_band || !s->cache || !s->index || !s->bh_out || !s->kernel)
!s->cache || !s->index || !s->bh_out || !s->kernel)
return AVERROR(ENOMEM);
s->ch_out->format = inlink->format;
@ -923,43 +968,13 @@ static int config_output(AVFilterLink *outlink)
s->outpicref->color_range = AVCOL_RANGE_JPEG;
factor = s->input_padding_size / (float)inlink->sample_rate;
switch (s->frequency_scale) {
case FSCALE_LOG:
minimum_frequency = logf(minimum_frequency) / logf(2.f);
maximum_frequency = logf(maximum_frequency) / logf(2.f);
break;
case FSCALE_BARK:
minimum_frequency = 6.f * asinhf(minimum_frequency / 600.f);
maximum_frequency = 6.f * asinhf(maximum_frequency / 600.f);
break;
case FSCALE_MEL:
minimum_frequency = 2595.f * log10f(1.f + minimum_frequency / 700.f);
maximum_frequency = 2595.f * log10f(1.f + maximum_frequency / 700.f);
break;
case FSCALE_ERBS:
minimum_frequency = 11.17268f * logf(1.f + (46.06538f * minimum_frequency) / (minimum_frequency + 14678.49f));
maximum_frequency = 11.17268f * logf(1.f + (46.06538f * maximum_frequency) / (maximum_frequency + 14678.49f));
break;
case FSCALE_SQRT:
minimum_frequency = sqrtf(minimum_frequency);
maximum_frequency = sqrtf(maximum_frequency);
break;
case FSCALE_CBRT:
minimum_frequency = cbrtf(minimum_frequency);
maximum_frequency = cbrtf(maximum_frequency);
break;
case FSCALE_QDRT:
minimum_frequency = powf(minimum_frequency, 0.25f);
maximum_frequency = powf(maximum_frequency, 0.25f);
break;
for (int n = 0; n < s->frequency_band_count; n++) {
s->frequency_band[2*n ] *= factor;
s->frequency_band[2*n+1] *= factor;
}
frequency_band(s->frequency_band, factor,
s->frequency_band_count, maximum_frequency - minimum_frequency,
minimum_frequency, s->frequency_scale, s->deviation);
av_log(ctx, AV_LOG_DEBUG, "factor: %f\n", factor);
av_log(ctx, AV_LOG_DEBUG, "nb_consumed_samples: %d\n", s->nb_consumed_samples);
av_log(ctx, AV_LOG_DEBUG, "hop_size: %d\n", s->hop_size);
av_log(ctx, AV_LOG_DEBUG, "ihop_size: %d\n", s->ihop_size);
av_log(ctx, AV_LOG_DEBUG, "input_sample_count: %d\n", s->input_sample_count);