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Skip the bit allocation search if previous and current SNR offsets are the

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maximum value of 1023.
This speeds up overall encoding depending on the content and bitrate.
The most improvement is with high bitrates and/or low complexity content.

Originally committed as revision 26181 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2010-12-31 23:22:08 +00:00
parent 5128842ea2
commit 9c84a72a25
1 changed files with 7 additions and 0 deletions
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7
libavcodec/ac3enc.c
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@ -1116,6 +1116,13 @@ static int cbr_bit_allocation(AC3EncodeContext *s)
snr_offset = s->coarse_snr_offset << 4;
/* if previous frame SNR offset was 1023, check if current frame can also
use SNR offset of 1023. if so, skip the search. */
if ((snr_offset | s->fine_snr_offset[0]) == 1023) {
if (bit_alloc(s, 1023) <= bits_left)
return 0;
}
while (snr_offset >= 0 &&
bit_alloc(s, snr_offset) > bits_left) {
snr_offset -= 64;