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[WIP] Fix: crackling sound when seeking forward after migrating to HDMI Audio

This commit is contained in:
Alex P 2025-09-30 13:14:15 +00:00
parent 05b347fe74
commit 7dc57bcdf3
1 changed files with 5 additions and 7 deletions
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12
internal/audio/c/audio.c
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@ -166,25 +166,23 @@ static inline void simd_interleave_stereo_s16(const short *left, const short *ri
/** /**
* Apply gain using NEON Q15 fixed-point math (8 samples/iteration) * Apply gain using NEON Q15 fixed-point math (8 samples/iteration)
* Uses vqrdmulhq_s16: single-instruction saturating rounded multiply-high
*/ */
static inline void simd_scale_volume_s16(short *samples, int count, float volume) { static inline void simd_scale_volume_s16(short *samples, int count, float volume) {
simd_init_once(); simd_init_once();
int16_t vol_fixed = (int16_t)(volume * 32767.0f); // For vqrdmulhq_s16, multiply volume by 2 since it extracts bits [30:15] not [31:16]
int16_t vol_fixed = (int16_t)(volume * 16384.0f);
int16x8_t vol_vec = vdupq_n_s16(vol_fixed); int16x8_t vol_vec = vdupq_n_s16(vol_fixed);
int simd_count = count & ~7; int simd_count = count & ~7;
for (int i = 0; i < simd_count; i += 8) { for (int i = 0; i < simd_count; i += 8) {
int16x8_t samples_vec = vld1q_s16(&samples[i]); int16x8_t samples_vec = vld1q_s16(&samples[i]);
int32x4_t low_result = vmull_s16(vget_low_s16(samples_vec), vget_low_s16(vol_vec)); int16x8_t result = vqrdmulhq_s16(samples_vec, vol_vec);
int32x4_t high_result = vmull_s16(vget_high_s16(samples_vec), vget_high_s16(vol_vec));
int16x4_t low_narrow = vshrn_n_s32(low_result, 15);
int16x4_t high_narrow = vshrn_n_s32(high_result, 15);
int16x8_t result = vcombine_s16(low_narrow, high_narrow);
vst1q_s16(&samples[i], result); vst1q_s16(&samples[i], result);
} }
for (int i = simd_count; i < count; i++) { for (int i = simd_count; i < count; i++) {
samples[i] = (short)((samples[i] * vol_fixed) >> 15); samples[i] = (short)((samples[i] * vol_fixed) >> 14);
} }
} }