Module: libav Branch: master Commit: 494bce6224c7da6a174fb16a49ed26e5aab32af1
Author: Kostya Shishkov <[email protected]> Committer: Kostya Shishkov <[email protected]> Date: Sat Mar 24 07:29:51 2012 +0100 ralf: read Huffman code lengths without GetBitContext Those descriptions are stored in nibbles, so they are easy to extract. And this way we don't need to pad tables for possible bit reader overreads. --- libavcodec/ralf.c | 8 ++++---- 1 files changed, 4 insertions(+), 4 deletions(-) diff --git a/libavcodec/ralf.c b/libavcodec/ralf.c index 38e7e69..0e5b046 100644 --- a/libavcodec/ralf.c +++ b/libavcodec/ralf.c @@ -80,17 +80,17 @@ static int init_ralf_vlc(VLC *vlc, const uint8_t *data, int elems) int counts[17], prefixes[18]; int i, cur_len; int max_bits = 0; - GetBitContext gb; - - init_get_bits(&gb, data, elems * 4); + int nb = 0; for (i = 0; i <= 16; i++) counts[i] = 0; for (i = 0; i < elems; i++) { - cur_len = get_bits(&gb, 4) + 1; + cur_len = (nb ? *data & 0xF : *data >> 4) + 1; counts[cur_len]++; max_bits = FFMAX(max_bits, cur_len); lens[i] = cur_len; + data += nb; + nb ^= 1; } prefixes[1] = 0; for (i = 1; i <= 16; i++) _______________________________________________ libav-commits mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-commits
