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Code Issues Releases Activity

ac3enc: NEON optimised float_to_fixed24

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Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-03-29 02:30:13 +01:00
parent 6d9f52b2cd
commit d782bca415
2 changed files with 16 additions and 0 deletions
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2
libavcodec/arm/ac3dsp_init_arm.c
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@ -27,6 +27,7 @@ void ff_ac3_exponent_min_neon(uint8_t *exp, int num_reuse_blocks, int nb_coefs);
int ff_ac3_max_msb_abs_int16_neon(const int16_t *src, int len);
void ff_ac3_lshift_int16_neon(int16_t *src, unsigned len, unsigned shift);
void ff_ac3_rshift_int32_neon(int32_t *src, unsigned len, unsigned shift);
void ff_float_to_fixed24_neon(int32_t *dst, const float *src, unsigned int len);
av_cold void ff_ac3dsp_init_arm(AC3DSPContext *c, int bit_exact)
{
@ -35,5 +36,6 @@ av_cold void ff_ac3dsp_init_arm(AC3DSPContext *c, int bit_exact)
c->ac3_max_msb_abs_int16 = ff_ac3_max_msb_abs_int16_neon;
c->ac3_lshift_int16 = ff_ac3_lshift_int16_neon;
c->ac3_rshift_int32 = ff_ac3_rshift_int32_neon;
c->float_to_fixed24 = ff_float_to_fixed24_neon;
}
}

14
libavcodec/arm/ac3dsp_neon.S
View File

@ -78,3 +78,17 @@ function ff_ac3_rshift_int32_neon, export=1
bgt 1b
bx lr
endfunc
function ff_float_to_fixed24_neon, export=1
1: vld1.32 {q0-q1}, [r1,:128]!
vcvt.s32.f32 q0, q0, #24
vld1.32 {q2-q3}, [r1,:128]!
vcvt.s32.f32 q1, q1, #24
vcvt.s32.f32 q2, q2, #24
vst1.32 {q0-q1}, [r0,:128]!
vcvt.s32.f32 q3, q3, #24
vst1.32 {q2-q3}, [r0,:128]!
subs r2, r2, #16
bgt 1b
bx lr
endfunc