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Decode DCT tokens by branching to a different code path for each branch

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on the huffman tree, instead of traversing the tree in a while loop.

Based on the similar optimization in libvpx's detokenize.c

10% faster at normal bitrates, and 30% faster for high-bitrate intra-only

Originally committed as revision 24468 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad
2010-07-23 21:46:17 +00:00
parent 5474ec2ac8
commit fe1b5d974a
3 changed files with 67 additions and 40 deletions
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20
libavcodec/vp8data.h
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@@ -329,21 +329,6 @@ static const uint8_t vp8_coeff_band[16] =
0, 1, 2, 3, 6, 4, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7
};
static const int8_t vp8_coeff_tree[NUM_DCT_TOKENS-1][2] =
{
{ -DCT_EOB, 1 }, // '0'
{ -DCT_0, 2 }, // '10'
{ -DCT_1, 3 }, // '110'
{ 4, 6 },
{ -DCT_2, 5 }, // '11100'
{ -DCT_3, -DCT_4 }, // '111010', '111011'
{ 7, 8 },
{ -DCT_CAT1, -DCT_CAT2 }, // '111100', '111101'
{ 9, 10 },
{ -DCT_CAT3, -DCT_CAT4 }, // '1111100', '1111101'
{ -DCT_CAT5, -DCT_CAT6 }, // '1111110', '1111111'
};
static const uint8_t vp8_dct_cat1_prob[] = { 159, 0 };
static const uint8_t vp8_dct_cat2_prob[] = { 165, 145, 0 };
static const uint8_t vp8_dct_cat3_prob[] = { 173, 148, 140, 0 };
@@ -351,10 +336,9 @@ static const uint8_t vp8_dct_cat4_prob[] = { 176, 155, 140, 135, 0 };
static const uint8_t vp8_dct_cat5_prob[] = { 180, 157, 141, 134, 130, 0 };
static const uint8_t vp8_dct_cat6_prob[] = { 254, 254, 243, 230, 196, 177, 153, 140, 133, 130, 129, 0 };
static const uint8_t * const vp8_dct_cat_prob[6] =
// only used for cat3 and above; cat 1 and 2 are referenced directly
static const uint8_t * const vp8_dct_cat_prob[] =
{
vp8_dct_cat1_prob,
vp8_dct_cat2_prob,
vp8_dct_cat3_prob,
vp8_dct_cat4_prob,
vp8_dct_cat5_prob,