/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/attributes.h" #include "libavutil/mem.h" #include "avfft.h" #include "fft.h" #include "rdft.h" #include "dct.h" /* FFT */ FFTContext *av_fft_init(int nbits, int inverse) { FFTContext *s = av_mallocz(sizeof(*s)); if (s && ff_fft_init(s, nbits, inverse)) av_freep(&s); return s; } void av_fft_permute(FFTContext *s, FFTComplex *z) { s->fft_permute(s, z); } void av_fft_calc(FFTContext *s, FFTComplex *z) { s->fft_calc(s, z); } av_cold void av_fft_end(FFTContext *s) { if (s) { ff_fft_end(s); av_free(s); } } #if CONFIG_MDCT FFTContext *av_mdct_init(int nbits, int inverse, double scale) { FFTContext *s = av_malloc(sizeof(*s)); if (s && ff_mdct_init(s, nbits, inverse, scale)) av_freep(&s); return s; } void av_imdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input) { s->imdct_calc(s, output, input); } void av_imdct_half(FFTContext *s, FFTSample *output, const FFTSample *input) { s->imdct_half(s, output, input); } void av_mdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input) { s->mdct_calc(s, output, input); } av_cold void av_mdct_end(FFTContext *s) { if (s) { ff_mdct_end(s); av_free(s); } } #endif /* CONFIG_MDCT */ #if CONFIG_RDFT RDFTContext *av_rdft_init(int nbits, enum RDFTransformType trans) { RDFTContext *s = av_malloc(sizeof(*s)); if (s && ff_rdft_init(s, nbits, trans)) av_freep(&s); return s; } void av_rdft_calc(RDFTContext *s, FFTSample *data) { s->rdft_calc(s, data); } av_cold void av_rdft_end(RDFTContext *s) { if (s) { ff_rdft_end(s); av_free(s); } } #endif /* CONFIG_RDFT */ #if CONFIG_DCT DCTContext *av_dct_init(int nbits, enum DCTTransformType inverse) { DCTContext *s = av_malloc(sizeof(*s)); if (s && ff_dct_init(s, nbits, inverse)) av_freep(&s); return s; } void av_dct_calc(DCTContext *s, FFTSample *data) { s->dct_calc(s, data); } av_cold void av_dct_end(DCTContext *s) { if (s) { ff_dct_end(s); av_free(s); } } #ifdef TEST int main(int argc, char **argv) { int i; #define LEN 1024 FFTSample *ref = av_malloc_array(LEN, sizeof(*ref)); FFTSample *data = av_malloc_array(LEN, sizeof(*data)); RDFTContext *rdft_context = av_rdft_init(10, DFT_R2C); RDFTContext *irdft_context = av_rdft_init(10, IDFT_C2R); if (!ref || !data || !rdft_context || !irdft_context) return 2; for (i=0; i<LEN; i++) { ref[i] = data[i] = i*456 + 123 + i*i; } av_rdft_calc(rdft_context, data); av_rdft_calc(irdft_context, data); for (i=0; i<LEN; i++) { if (fabs(ref[i] - data[i]/LEN*2) > 1) { fprintf(stderr, "Failed at %d (%f %f)\n", i, ref[i], data[i]/LEN*2); return 1; } } av_rdft_end(rdft_context); av_rdft_end(irdft_context); av_free(data); av_free(ref); return 0; } #endif #endif /* CONFIG_DCT */