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| author | Clément Bœsch <u@pkh.me> | 2014-09-06 13:47:59 +0200 |
|---|---|---|
| committer | Clément Bœsch <u@pkh.me> | 2014-09-06 13:47:59 +0200 |
| commit | b2c0b80f62912f932cc3bb04621408601a9ed4d5 (patch) | |
| tree | 90788fc120f7b8546622177178a060e2cf190b9f /libavfilter/f_ebur128.c | |
| parent | 1654ca7d4e233d4502fcc1ea3ba7ea8dbf025872 (diff) | |
| download | ffmpeg-b2c0b80f62912f932cc3bb04621408601a9ed4d5.tar.gz | |
avfilter/ebur128: rework channel weighting definition code
Should fix CID1194399 (Bad bit shift operation)
Diffstat (limited to 'libavfilter/f_ebur128.c')
| -rw-r--r-- | libavfilter/f_ebur128.c | 14 |
1 files changed, 3 insertions, 11 deletions
diff --git a/libavfilter/f_ebur128.c b/libavfilter/f_ebur128.c index a02cf28723..c18ae79915 100644 --- a/libavfilter/f_ebur128.c +++ b/libavfilter/f_ebur128.c @@ -363,7 +363,6 @@ static int config_audio_input(AVFilterLink *inlink) static int config_audio_output(AVFilterLink *outlink) { int i; - int idx_bitposn = 0; AVFilterContext *ctx = outlink->src; EBUR128Context *ebur128 = ctx->priv; const int nb_channels = av_get_channel_layout_nb_channels(outlink->channel_layout); @@ -379,23 +378,16 @@ static int config_audio_output(AVFilterLink *outlink) return AVERROR(ENOMEM); for (i = 0; i < nb_channels; i++) { - - /* find the next bit that is set starting from the right */ - while ((outlink->channel_layout & 1ULL<<idx_bitposn) == 0 && idx_bitposn < 63) - idx_bitposn++; - /* channel weighting */ - if ((1ULL<<idx_bitposn & AV_CH_LOW_FREQUENCY) || - (1ULL<<idx_bitposn & AV_CH_LOW_FREQUENCY_2)) { + const uint16_t chl = av_channel_layout_extract_channel(outlink->channel_layout, i); + if (chl & (AV_CH_LOW_FREQUENCY|AV_CH_LOW_FREQUENCY_2)) { ebur128->ch_weighting[i] = 0; - } else if (1ULL<<idx_bitposn & BACK_MASK) { + } else if (chl & BACK_MASK) { ebur128->ch_weighting[i] = 1.41; } else { ebur128->ch_weighting[i] = 1.0; } - idx_bitposn++; - if (!ebur128->ch_weighting[i]) continue; |