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The band filter for G.722 could cause numerical overflow in unusual circumstances with the maximum possiblke signal level. The filter output is now saturated to 16 bits to avoid this.

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Steve Underwood committed 2016-08-31 23:59:32 +08:00
1 parent 160e8f12c0
commit 29f5fb6aa7
2 files changed
+9 -21
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libs/spandsp/src/g722.c
+2 -2
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@@ -426,8 +426,8 @@ SPAN_DECLARE(int) g722_decode(g722_decode_state_t *s, int16_t amp[], const uint8
s->ptr = 0;
/* We shift by 12 to allow for the QMF filters (DC gain = 4096), less 1
to allow for the 15 bit input to the G.722 algorithm. */
amp[outlen++] = (int16_t) (vec_circular_dot_prodi16(s->y, qmf_coeffs_rev, 12, s->ptr) >> 11);
amp[outlen++] = (int16_t) (vec_circular_dot_prodi16(s->x, qmf_coeffs_fwd, 12, s->ptr) >> 11);
amp[outlen++] = saturate16(vec_circular_dot_prodi16(s->y, qmf_coeffs_rev, 12, s->ptr) >> 11);
amp[outlen++] = saturate16(vec_circular_dot_prodi16(s->x, qmf_coeffs_fwd, 12, s->ptr) >> 11);
}
}
}