-#define LPC1(x) {\
- int c = coefs[(x)-1];\
- p0 += c * s;\
- s = smp[i-(x)+1];\
- p1 += c * s;\
-}
-
-static av_always_inline void encode_residual_lpc_unrolled(int32_t *res,
- const int32_t *smp, int n, int order,
- const int32_t *coefs, int shift, int big)
-{
- int i;
- for (i = order; i < n; i += 2) {
- int s = smp[i-order];
- int p0 = 0, p1 = 0;
- if (big) {
- switch (order) {
- case 32: LPC1(32)
- case 31: LPC1(31)
- case 30: LPC1(30)
- case 29: LPC1(29)
- case 28: LPC1(28)
- case 27: LPC1(27)
- case 26: LPC1(26)
- case 25: LPC1(25)
- case 24: LPC1(24)
- case 23: LPC1(23)
- case 22: LPC1(22)
- case 21: LPC1(21)
- case 20: LPC1(20)
- case 19: LPC1(19)
- case 18: LPC1(18)
- case 17: LPC1(17)
- case 16: LPC1(16)
- case 15: LPC1(15)
- case 14: LPC1(14)
- case 13: LPC1(13)
- case 12: LPC1(12)
- case 11: LPC1(11)
- case 10: LPC1(10)
- case 9: LPC1( 9)
- LPC1( 8)
- LPC1( 7)
- LPC1( 6)
- LPC1( 5)
- LPC1( 4)
- LPC1( 3)
- LPC1( 2)
- LPC1( 1)
- }
- } else {
- switch (order) {
- case 8: LPC1( 8)
- case 7: LPC1( 7)
- case 6: LPC1( 6)
- case 5: LPC1( 5)
- case 4: LPC1( 4)
- case 3: LPC1( 3)
- case 2: LPC1( 2)
- case 1: LPC1( 1)
- }
- }
- res[i ] = smp[i ] - (p0 >> shift);
- res[i+1] = smp[i+1] - (p1 >> shift);
- }
-}
-
-
-static void encode_residual_lpc(int32_t *res, const int32_t *smp, int n,
- int order, const int32_t *coefs, int shift)
-{
- int i;
- for (i = 0; i < order; i++)
- res[i] = smp[i];
-#if CONFIG_SMALL
- for (i = order; i < n; i += 2) {
- int j;
- int s = smp[i];
- int p0 = 0, p1 = 0;
- for (j = 0; j < order; j++) {
- int c = coefs[j];
- p1 += c * s;
- s = smp[i-j-1];
- p0 += c * s;
- }
- res[i ] = smp[i ] - (p0 >> shift);
- res[i+1] = smp[i+1] - (p1 >> shift);
- }
-#else
- switch (order) {
- case 1: encode_residual_lpc_unrolled(res, smp, n, 1, coefs, shift, 0); break;
- case 2: encode_residual_lpc_unrolled(res, smp, n, 2, coefs, shift, 0); break;
- case 3: encode_residual_lpc_unrolled(res, smp, n, 3, coefs, shift, 0); break;
- case 4: encode_residual_lpc_unrolled(res, smp, n, 4, coefs, shift, 0); break;
- case 5: encode_residual_lpc_unrolled(res, smp, n, 5, coefs, shift, 0); break;
- case 6: encode_residual_lpc_unrolled(res, smp, n, 6, coefs, shift, 0); break;
- case 7: encode_residual_lpc_unrolled(res, smp, n, 7, coefs, shift, 0); break;
- case 8: encode_residual_lpc_unrolled(res, smp, n, 8, coefs, shift, 0); break;
- default: encode_residual_lpc_unrolled(res, smp, n, order, coefs, shift, 1); break;
- }
-#endif
-}
-
-