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00021 #include "libavcodec/fmtconvert.h"
00022
00023 #include "libavutil/ppc/util_altivec.h"
00024 #include "libavutil/mem.h"
00025 #include "dsputil_altivec.h"
00026
00027 static void int32_to_float_fmul_scalar_altivec(float *dst, const int *src,
00028 float mul, int len)
00029 {
00030 union {
00031 vector float v;
00032 float s[4];
00033 } mul_u;
00034 int i;
00035 vector float src1, src2, dst1, dst2, mul_v, zero;
00036
00037 zero = (vector float)vec_splat_u32(0);
00038 mul_u.s[0] = mul;
00039 mul_v = vec_splat(mul_u.v, 0);
00040
00041 for (i = 0; i < len; i += 8) {
00042 src1 = vec_ctf(vec_ld(0, src+i), 0);
00043 src2 = vec_ctf(vec_ld(16, src+i), 0);
00044 dst1 = vec_madd(src1, mul_v, zero);
00045 dst2 = vec_madd(src2, mul_v, zero);
00046 vec_st(dst1, 0, dst+i);
00047 vec_st(dst2, 16, dst+i);
00048 }
00049 }
00050
00051
00052 static vector signed short float_to_int16_one_altivec(const float *src)
00053 {
00054 vector float s0 = vec_ld(0, src);
00055 vector float s1 = vec_ld(16, src);
00056 vector signed int t0 = vec_cts(s0, 0);
00057 vector signed int t1 = vec_cts(s1, 0);
00058 return vec_packs(t0,t1);
00059 }
00060
00061 static void float_to_int16_altivec(int16_t *dst, const float *src, long len)
00062 {
00063 int i;
00064 vector signed short d0, d1, d;
00065 vector unsigned char align;
00066 if (((long)dst) & 15) {
00067 for (i = 0; i < len - 7; i += 8) {
00068 d0 = vec_ld(0, dst+i);
00069 d = float_to_int16_one_altivec(src + i);
00070 d1 = vec_ld(15, dst+i);
00071 d1 = vec_perm(d1, d0, vec_lvsl(0, dst + i));
00072 align = vec_lvsr(0, dst + i);
00073 d0 = vec_perm(d1, d, align);
00074 d1 = vec_perm(d, d1, align);
00075 vec_st(d0, 0, dst + i);
00076 vec_st(d1, 15, dst + i);
00077 }
00078 } else {
00079 for (i = 0; i < len - 7; i += 8) {
00080 d = float_to_int16_one_altivec(src + i);
00081 vec_st(d, 0, dst + i);
00082 }
00083 }
00084 }
00085
00086 static void float_to_int16_interleave_altivec(int16_t *dst, const float **src,
00087 long len, int channels)
00088 {
00089 int i;
00090 vector signed short d0, d1, d2, c0, c1, t0, t1;
00091 vector unsigned char align;
00092
00093 if (channels == 1)
00094 float_to_int16_altivec(dst, src[0], len);
00095 else {
00096 if (channels == 2) {
00097 if (((long)dst) & 15) {
00098 for (i = 0; i < len - 7; i += 8) {
00099 d0 = vec_ld(0, dst + i);
00100 t0 = float_to_int16_one_altivec(src[0] + i);
00101 d1 = vec_ld(31, dst + i);
00102 t1 = float_to_int16_one_altivec(src[1] + i);
00103 c0 = vec_mergeh(t0, t1);
00104 c1 = vec_mergel(t0, t1);
00105 d2 = vec_perm(d1, d0, vec_lvsl(0, dst + i));
00106 align = vec_lvsr(0, dst + i);
00107 d0 = vec_perm(d2, c0, align);
00108 d1 = vec_perm(c0, c1, align);
00109 vec_st(d0, 0, dst + i);
00110 d0 = vec_perm(c1, d2, align);
00111 vec_st(d1, 15, dst + i);
00112 vec_st(d0, 31, dst + i);
00113 dst += 8;
00114 }
00115 } else {
00116 for (i = 0; i < len - 7; i += 8) {
00117 t0 = float_to_int16_one_altivec(src[0] + i);
00118 t1 = float_to_int16_one_altivec(src[1] + i);
00119 d0 = vec_mergeh(t0, t1);
00120 d1 = vec_mergel(t0, t1);
00121 vec_st(d0, 0, dst + i);
00122 vec_st(d1, 16, dst + i);
00123 dst += 8;
00124 }
00125 }
00126 } else {
00127 DECLARE_ALIGNED(16, int16_t, tmp)[len];
00128 int c, j;
00129 for (c = 0; c < channels; c++) {
00130 float_to_int16_altivec(tmp, src[c], len);
00131 for (i = 0, j = c; i < len; i++, j+=channels)
00132 dst[j] = tmp[i];
00133 }
00134 }
00135 }
00136 }
00137
00138 void ff_fmt_convert_init_altivec(FmtConvertContext *c, AVCodecContext *avctx)
00139 {
00140 c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_altivec;
00141 if (!(avctx->flags & CODEC_FLAG_BITEXACT)) {
00142 c->float_to_int16 = float_to_int16_altivec;
00143 c->float_to_int16_interleave = float_to_int16_interleave_altivec;
00144 }
00145 }