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| author | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-07-24 15:51:09 +0200 |
|---|---|---|
| committer | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-09-18 02:13:43 +0200 |
| commit | 6ffc7be5da0ece247cf26f1d6b94cd1d6af3d338 (patch) | |
| tree | 908278846f8270c40578bf27ba1042b9fc967353 /libavcodec/smacker.c | |
| parent | b2c42f02337301583b51bea2ede9dbfd837991c0 (diff) | |
avcodec/smacker: Avoid code duplication
Besides the obvious advantage of less code this also has a performance
impact: For GCC 9 the time spent on one call to smka_decode_frame() for
the sample from ticket #2425 decreased from 1693619 to 1498127
decicycles. For Clang 9, it decreased from 1369089 to 1366465
decicycles.
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Diffstat (limited to 'libavcodec/smacker.c')
| -rw-r--r-- | libavcodec/smacker.c | 62 |
1 files changed, 20 insertions, 42 deletions
diff --git a/libavcodec/smacker.c b/libavcodec/smacker.c index d2b1c68162..ffd24c11e7 100644 --- a/libavcodec/smacker.c +++ b/libavcodec/smacker.c @@ -671,37 +671,23 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data, for(i = 0; i <= stereo; i++) *samples++ = pred[i]; for(; i < unp_size / 2; i++) { + unsigned idx = 2 * (i & stereo); if (get_bits_left(&gb) < 0) { ret = AVERROR_INVALIDDATA; goto error; } - if(i & stereo) { - if(vlc[2].table) - res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3); - else - res = values[2]; - val = res; - if(vlc[3].table) - res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3); - else - res = values[3]; - val |= res << 8; - pred[1] += val; - *samples++ = pred[1]; - } else { - if(vlc[0].table) - res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3); - else - res = values[0]; - val = res; - if(vlc[1].table) - res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3); - else - res = values[1]; - val |= res << 8; - pred[0] += val; - *samples++ = pred[0]; - } + if (vlc[idx].table) + res = get_vlc2(&gb, vlc[idx].table, SMKTREE_BITS, 3); + else + res = values[idx]; + val = res; + if (vlc[++idx].table) + res = get_vlc2(&gb, vlc[idx].table, SMKTREE_BITS, 3); + else + res = values[idx]; + val |= res << 8; + pred[idx / 2] += val; + *samples++ = pred[idx / 2]; } } else { //8-bit data for(i = stereo; i >= 0; i--) @@ -709,25 +695,17 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data, for(i = 0; i <= stereo; i++) *samples8++ = pred[i]; for(; i < unp_size; i++) { + unsigned idx = i & stereo; if (get_bits_left(&gb) < 0) { ret = AVERROR_INVALIDDATA; goto error; } - if(i & stereo){ - if(vlc[1].table) - res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3); - else - res = values[1]; - pred[1] += res; - *samples8++ = pred[1]; - } else { - if(vlc[0].table) - res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3); - else - res = values[0]; - pred[0] += res; - *samples8++ = pred[0]; - } + if (vlc[idx].table) + val = get_vlc2(&gb, vlc[idx].table, SMKTREE_BITS, 3); + else + val = values[idx]; + pred[idx] += val; + *samples8++ = pred[idx]; } } |