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avfilter/f_ebur128: simplify sample cache array

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We don't need an X sample cache anymore, and we also can simplify the
access macro slightly.
This commit is contained in:
Niklas Haas
2025-06-12 20:43:52 +02:00
parent c5f3033a86
commit 2d9435d76f
1 changed files with 11 additions and 18 deletions
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29
libavfilter/f_ebur128.c
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@@ -115,7 +115,6 @@ typedef struct EBUR128Context {
/* Filter caches.
* The mult by 3 in the following is for X[i], X[i-1] and X[i-2] */
double *x; ///< 3 input samples cache for each channel
double *y; ///< 3 pre-filter samples cache for each channel
double *z; ///< 3 RLB-filter samples cache for each channel
double pre_b[3]; ///< pre-filter numerator coefficients
@@ -446,11 +445,10 @@ static int config_audio_output(AVFilterLink *outlink)
AV_CH_SURROUND_DIRECT_LEFT |AV_CH_SURROUND_DIRECT_RIGHT)
ebur128->nb_channels = nb_channels;
ebur128->x = av_calloc(nb_channels, 3 * sizeof(*ebur128->x));
ebur128->y = av_calloc(nb_channels, 3 * sizeof(*ebur128->y));
ebur128->z = av_calloc(nb_channels, 3 * sizeof(*ebur128->z));
ebur128->ch_weighting = av_calloc(nb_channels, sizeof(*ebur128->ch_weighting));
if (!ebur128->ch_weighting || !ebur128->x || !ebur128->y || !ebur128->z)
if (!ebur128->ch_weighting || !ebur128->y || !ebur128->z)
return AVERROR(ENOMEM);
#define I400_BINS(x) ((x) * 4 / 10)
@@ -673,34 +671,30 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
MOVE_TO_NEXT_CACHED_ENTRY(3000);
for (ch = 0; ch < nb_channels; ch++) {
double bin;
if (ebur128->peak_mode & PEAK_MODE_SAMPLES_PEAKS)
ebur128->sample_peaks[ch] = FFMAX(ebur128->sample_peaks[ch], fabs(samples[idx_insample * nb_channels + ch]));
ebur128->x[ch * 3] = samples[idx_insample * nb_channels + ch]; // set X[i]
if (!ebur128->ch_weighting[ch])
continue;
/* Y[i] = X[i]*b0 + X[i-1]*b1 + X[i-2]*b2 - Y[i-1]*a1 - Y[i-2]*a2 */
#define FILTER(Y, X, NUM, DEN) do { \
double *dst = ebur128->Y + ch*3; \
double src = ebur128->X[ch*3] ; \
double dst0 = NUM[0] * src + dst[1]; \
dst[1] = NUM[1] * src + dst[2] - DEN[1] * dst0; \
dst[2] = NUM[2] * src - DEN[2] * dst0; \
dst[0] = dst0; \
#define FILTER(DST, SRC, NUM, DEN) do { \
const double tmp = DST[0] = NUM[0] * SRC + DST[1]; \
DST[1] = NUM[1] * SRC + DST[2] - DEN[1] * tmp; \
DST[2] = NUM[2] * SRC - DEN[2] * tmp; \
} while (0)
const double x = samples[idx_insample * nb_channels + ch];
double *restrict y = &ebur128->y[3 * ch];
double *restrict z = &ebur128->z[3 * ch];
// TODO: merge both filters in one?
FILTER(y, x, ebur128->pre_b, ebur128->pre_a); // apply pre-filter
FILTER(z, y, ebur128->rlb_b, ebur128->rlb_a); // apply RLB-filter
bin = ebur128->z[ch * 3] * ebur128->z[ch * 3];
FILTER(z, *y, ebur128->rlb_b, ebur128->rlb_a); // apply RLB-filter
/* add the new value, and limit the sum to the cache size (400ms or 3s)
* by removing the oldest one */
double bin = *z * *z;
ebur128->i400.sum [ch] = ebur128->i400.sum [ch] + bin - ebur128->i400.cache [ch][bin_id_400];
ebur128->i3000.sum[ch] = ebur128->i3000.sum[ch] + bin - ebur128->i3000.cache[ch][bin_id_3000];
@@ -1073,7 +1067,6 @@ static av_cold void uninit(AVFilterContext *ctx)
}
av_freep(&ebur128->y_line_ref);
av_freep(&ebur128->x);
av_freep(&ebur128->y);
av_freep(&ebur128->z);
av_freep(&ebur128->ch_weighting);