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VP8: partially inline decode_block_coeffs

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Avoids a function call in the case of empty DCT blocks (most of the time).

Originally committed as revision 24691 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jason Garrett-Glaser 2010-08-04 02:23:25 +00:00
parent ffbf0794f9
commit 1e73967950
1 changed files with 15 additions and 9 deletions
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22
libavcodec/vp8.c
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@ -821,18 +821,13 @@ void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y, uint8_
* @return 0 if no coeffs were decoded
* otherwise, the index of the last coeff decoded plus one
*/
static int decode_block_coeffs(VP56RangeCoder *c, DCTELEM block[16],
static int decode_block_coeffs_internal(VP56RangeCoder *c, DCTELEM block[16],
uint8_t probs[8][3][NUM_DCT_TOKENS-1],
int i, int zero_nhood, int16_t qmul[2])
int i, uint8_t *token_prob, int16_t qmul[2])
{
uint8_t *token_prob = probs[i][zero_nhood];
int coeff;
if (!vp56_rac_get_prob_branchy(c, token_prob[0]))
return 0;
goto skip_eob;
do {
int coeff;
if (!vp56_rac_get_prob_branchy(c, token_prob[0])) // DCT_EOB
return i;
@ -879,6 +874,17 @@ skip_eob:
return i;
}
static av_always_inline
int decode_block_coeffs(VP56RangeCoder *c, DCTELEM block[16],
uint8_t probs[8][3][NUM_DCT_TOKENS-1],
int i, int zero_nhood, int16_t qmul[2])
{
uint8_t *token_prob = probs[i][zero_nhood];
if (!vp56_rac_get_prob_branchy(c, token_prob[0])) // DCT_EOB
return 0;
return decode_block_coeffs_internal(c, block, probs, i, token_prob, qmul);
}
static av_always_inline
void decode_mb_coeffs(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb,
uint8_t t_nnz[9], uint8_t l_nnz[9])