applyGainThenAdd2()

static void applyGainThenAdd2 ( int16_t *  data, const int16_t *  in, int32_t  mult  )

static

Definition at line 21 of file eris_mixer_ext.cpp.

{
    uint32_t *dst = (uint32_t *)data;
    const uint32_t *src = (uint32_t *)in;
    const uint32_t *end = (uint32_t *)(data + AUDIO_BLOCK_SAMPLES);
 
    if (mult == 65536) {
        do {
            uint32_t tmp32 = *dst;
            *dst++ = signed_add_16_and_16(tmp32, *src++);
            tmp32 = *dst;
            *dst++ = signed_add_16_and_16(tmp32, *src++);
        } while (dst < end);
    } else {
        do {
            uint32_t tmp32 = *src++; // read 2 samples from *data
            int32_t val1 = signed_multiply_32x16b(mult, tmp32);
            int32_t val2 = signed_multiply_32x16t(mult, tmp32);
            val1 = signed_saturate_rshift(val1, 16, 0);
            val2 = signed_saturate_rshift(val2, 16, 0);
            tmp32 = pack_16b_16b(val2, val1);
            uint32_t tmp32b = *dst;
            *dst++ = signed_add_16_and_16(tmp32, tmp32b);
        } while (dst < end);
    }
}

Referenced by AudioMixer8::update().

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