lavfi/ebur128: advance pointer to samples
Correct the advancement of a pointer to skip over LFE samples as intended in the loudness computation. This suggested patch is 3 of 3 for Ticket #2144 "libavfilter ebur128 loudness inaccuracy, irregular time interval, LFE interference". This suggested patch supersedes the contribution of January 15, 2013 in the thread “[PATCH] lavfi: EBU R.128 irreg time, ch weights, skip LFE” which combined multiple fixes in one batch.
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@ -478,6 +478,8 @@ static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *insamples)
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for (ch = 0; ch < nb_channels; ch++) {
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double bin;
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ebur128->x[ch * 3] = *samples++; // set X[i]
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if (!ebur128->ch_weighting[ch])
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continue;
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@ -491,8 +493,6 @@ static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *insamples)
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- dst[1]*name##_A1 - dst[2]*name##_A2; \
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} while (0)
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ebur128->x[ch * 3] = *samples++; // set X[i]
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// TODO: merge both filters in one?
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FILTER(y, x, PRE); // apply pre-filter
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ebur128->x[ch * 3 + 2] = ebur128->x[ch * 3 + 1];
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