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when we mix into a 16bit accumulator make sure we clamp before we scale with a volume to avoid range faults when multiplying

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This commit is contained in:
Lennart Poettering 2008-10-02 02:29:56 +02:00
parent 08cf9db0d1
commit ea82dec294
2 changed files with 8 additions and 6 deletions
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8
src/pulsecore/sample-util.c
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@ -214,8 +214,8 @@ size_t pa_mix(
m->ptr = (uint8_t*) m->ptr + sizeof(int16_t);
}
sum = (sum * linear[channel]) / 0x10000;
sum = PA_CLAMP_UNLIKELY(sum, -0x8000, 0x7FFF);
sum = (sum * linear[channel]) / 0x10000;
*((int16_t*) data) = (int16_t) sum;
data = (uint8_t*) data + sizeof(int16_t);
@ -253,8 +253,8 @@ size_t pa_mix(
m->ptr = (uint8_t*) m->ptr + sizeof(int16_t);
}
sum = (sum * linear[channel]) / 0x10000;
sum = PA_CLAMP_UNLIKELY(sum, -0x8000, 0x7FFF);
sum = (sum * linear[channel]) / 0x10000;
*((int16_t*) data) = PA_INT16_SWAP((int16_t) sum);
data = (uint8_t*) data + sizeof(int16_t);
@ -411,8 +411,8 @@ size_t pa_mix(
m->ptr = (uint8_t*) m->ptr + 1;
}
sum = (sum * linear[channel]) / 0x10000;
sum = PA_CLAMP_UNLIKELY(sum, -0x8000, 0x7FFF);
sum = (sum * linear[channel]) / 0x10000;
*((uint8_t*) data) = (uint8_t) st_14linear2ulaw((int16_t) sum >> 2);
data = (uint8_t*) data + 1;
@ -450,8 +450,8 @@ size_t pa_mix(
m->ptr = (uint8_t*) m->ptr + 1;
}
sum = (sum * linear[channel]) / 0x10000;
sum = PA_CLAMP_UNLIKELY(sum, -0x8000, 0x7FFF);
sum = (sum * linear[channel]) / 0x10000;
*((uint8_t*) data) = (uint8_t) st_13linear2alaw((int16_t) sum >> 3);
data = (uint8_t*) data + 1;