Module: libav Branch: master Commit: 76a75c523cd3c63560185394a0a5cd7249db962a
Author: Tim Walker <[email protected]> Committer: Tim Walker <[email protected]> Date: Wed Jan 15 00:18:19 2014 +0000 lavr: mix front center channel as indicated in the ATSC A/52 specification. When mixing 3 front channels into 2, the center channel is mixed into left and right with the center mix level, not -3dB. --- libavresample/audio_mix_matrix.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/libavresample/audio_mix_matrix.c b/libavresample/audio_mix_matrix.c index 8da1b48..487869b 100644 --- a/libavresample/audio_mix_matrix.c +++ b/libavresample/audio_mix_matrix.c @@ -126,8 +126,13 @@ int avresample_build_matrix(uint64_t in_layout, uint64_t out_layout, /* mix front center to front left/right */ if (unaccounted & AV_CH_FRONT_CENTER) { if ((out_layout & AV_CH_LAYOUT_STEREO) == AV_CH_LAYOUT_STEREO) { - matrix[FRONT_LEFT ][FRONT_CENTER] += M_SQRT1_2; - matrix[FRONT_RIGHT][FRONT_CENTER] += M_SQRT1_2; + if ((in_layout & AV_CH_LAYOUT_STEREO) == AV_CH_LAYOUT_STEREO) { + matrix[FRONT_LEFT ][FRONT_CENTER] += center_mix_level; + matrix[FRONT_RIGHT][FRONT_CENTER] += center_mix_level; + } else { + matrix[FRONT_LEFT ][FRONT_CENTER] += M_SQRT1_2; + matrix[FRONT_RIGHT][FRONT_CENTER] += M_SQRT1_2; + } } else return AVERROR_PATCHWELCOME; } _______________________________________________ libav-commits mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-commits
