[FFmpeg-cvslog] ac3enc: clip coupling coordinates during calculation
Justin Ruggles
git at videolan.org
Thu Aug 11 21:09:22 CEST 2011
ffmpeg | branch: master | Justin Ruggles <justin.ruggles at gmail.com> | Sun Aug 7 17:12:49 2011 -0400| [069083a419fc1a267ee997817c4e368fa67ca154] | committer: Justin Ruggles
ac3enc: clip coupling coordinates during calculation
This is faster than using the clip_coefficients() function. Also,
clipping the coordinates before determining reuse is better since it
will compare coordinates that are closer to their final encoded values.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=069083a419fc1a267ee997817c4e368fa67ca154
---
libavcodec/ac3enc_template.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)
diff --git a/libavcodec/ac3enc_template.c b/libavcodec/ac3enc_template.c
index 7a6d72f..943a55a 100644
--- a/libavcodec/ac3enc_template.c
+++ b/libavcodec/ac3enc_template.c
@@ -126,7 +126,7 @@ static inline float calc_cpl_coord(float energy_ch, float energy_cpl)
float coord = 0.125;
if (energy_cpl > 0)
coord *= sqrtf(energy_ch / energy_cpl);
- return coord;
+ return FFMIN(coord, COEF_MAX);
}
@@ -291,7 +291,6 @@ static void apply_channel_coupling(AC3EncodeContext *s)
if (!block->cpl_in_use)
continue;
- clip_coefficients(&s->dsp, cpl_coords[blk][1], s->fbw_channels * 16);
s->ac3dsp.float_to_fixed24(fixed_cpl_coords[blk][1],
cpl_coords[blk][1],
s->fbw_channels * 16);
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