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| author | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-10-12 07:45:23 +0200 |
|---|---|---|
| committer | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-10-12 22:38:40 +0200 |
| commit | d7a503ecf9f42561b4a6e2207812a97074f43687 (patch) | |
| tree | 83d56c32339b3f348803dddfdfac9f2a47d22c64 /libavcodec | |
| parent | 3977aeb78cb88575171bbbb515520cb01e9bbe15 (diff) | |
| download | ffmpeg-d7a503ecf9f42561b4a6e2207812a97074f43687.tar.gz | |
avcodec/ivi: Avoid reversing BE VLC codes for LE bitstream reader
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/ivi.c | 22 |
1 files changed, 2 insertions, 20 deletions
diff --git a/libavcodec/ivi.c b/libavcodec/ivi.c index c10984e83e..5e1180a5f0 100644 --- a/libavcodec/ivi.c +++ b/libavcodec/ivi.c @@ -35,7 +35,6 @@ #include "avcodec.h" #include "get_bits.h" #include "internal.h" -#include "mathops.h" #include "ivi.h" #include "ivi_dsp.h" @@ -115,23 +114,6 @@ static int ivi_mc(const IVIBandDesc *band, ivi_mc_func mc, ivi_mc_avg_func mc_av return 0; } -/** - * Reverse "nbits" bits of the value "val" and return the result - * in the least significant bits. - */ -static uint16_t inv_bits(uint16_t val, int nbits) -{ - uint16_t res; - - if (nbits <= 8) { - res = ff_reverse[val] >> (8 - nbits); - } else - res = ((ff_reverse[val & 0xFF] << 8) + - (ff_reverse[val >> 8])) >> (16 - nbits); - - return res; -} - /* * Generate a huffman codebook from the given descriptor * and convert it into the FFmpeg VLC table. @@ -162,7 +144,7 @@ static int ivi_create_huff_from_desc(const IVIHuffDesc *cb, VLC *vlc, int flag) if (bits[pos] > IVI_VLC_BITS) return AVERROR_INVALIDDATA; /* invalid descriptor */ - codewords[pos] = inv_bits((prefix | j), bits[pos]); + codewords[pos] = prefix | j; if (!bits[pos]) bits[pos] = 1; @@ -172,7 +154,7 @@ static int ivi_create_huff_from_desc(const IVIHuffDesc *cb, VLC *vlc, int flag) /* number of codewords = pos */ return init_vlc(vlc, IVI_VLC_BITS, pos, bits, 1, 1, codewords, 2, 2, - (flag ? INIT_VLC_USE_NEW_STATIC : 0) | INIT_VLC_LE); + (flag ? INIT_VLC_USE_NEW_STATIC : 0) | INIT_VLC_OUTPUT_LE); } av_cold void ff_ivi_init_static_vlc(void) |