av_cold int ff_fft_init(FFTContext *s, int nbits, int inverse) { int i, j, n; if (nbits < 2 || nbits > 16) goto fail; s->nbits = nbits; n = 1 << nbits; s->revtab = av_malloc(n * sizeof(uint16_t)); if (!s->revtab) goto fail; s->tmp_buf = av_malloc(n * sizeof(FFTComplex)); if (!s->tmp_buf) goto fail; s->inverse = inverse; s->fft_permute = ff_fft_permute_c; s->fft_calc = ff_fft_calc_c; #if CONFIG_MDCT s->imdct_calc = ff_imdct_calc_c; s->imdct_half = ff_imdct_half_c; s->mdct_calc = ff_mdct_calc_c; #endif if (ARCH_ARM) ff_fft_init_arm(s); if (HAVE_ALTIVEC) ff_fft_init_altivec(s); if (HAVE_MMX) ff_fft_init_mmx(s); for(j=4; j<=nbits; j++) { ff_init_ff_cos_tabs(j); } for(i=0; i<n; i++) s->revtab[-split_radix_permutation(i, n, s->inverse) & (n-1)] = i; return 0; fail: av_freep(&s->revtab); av_freep(&s->tmp_buf); return -1; }