本文整理汇总了C++中FFTContext类的典型用法代码示例。如果您正苦于以下问题：C++ FFTContext类的具体用法？C++ FFTContext怎么用？C++ FFTContext使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了FFTContext类的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: apply_window_and_mdct
static int apply_window_and_mdct(AVCodecContext *avctx, const AVFrame *frame)
{
WMACodecContext *s = avctx->priv_data;
float **audio = (float **) frame->extended_data;
int len = frame->nb_samples;
int window_index = s->frame_len_bits - s->block_len_bits;
FFTContext *mdct = &s->mdct_ctx[window_index];
int ch;
const float *win = s->windows[window_index];
int window_len = 1 << s->block_len_bits;
float n = 2.0 * 32768.0 / window_len;
for (ch = 0; ch < avctx->channels; ch++) {
memcpy(s->output, s->frame_out[ch], window_len * sizeof(*s->output));
s->fdsp->vector_fmul_scalar(s->frame_out[ch], audio[ch], n, len);
s->fdsp->vector_fmul_reverse(&s->output[window_len], s->frame_out[ch],
win, len);
s->fdsp->vector_fmul(s->frame_out[ch], s->frame_out[ch], win, len);
mdct->mdct_calc(mdct, s->coefs[ch], s->output);
if (!isfinite(s->coefs[ch][0])) {
av_log(avctx, AV_LOG_ERROR, "Input contains NaN/+-Inf\n");
return AVERROR(EINVAL);
}
}
return 0;
}示例2: imdct_and_window
static void imdct_and_window(TwinVQContext *tctx, enum TwinVQFrameType ftype,
int wtype, float *in, float *prev, int ch)
{
FFTContext *mdct = &tctx->mdct_ctx[ftype];
const TwinVQModeTab *mtab = tctx->mtab;
int bsize = mtab->size / mtab->fmode[ftype].sub;
int size = mtab->size;
float *buf1 = tctx->tmp_buf;
int j, first_wsize, wsize; // Window size
float *out = tctx->curr_frame + 2 * ch * mtab->size;
float *out2 = out;
float *prev_buf;
int types_sizes[] = {
mtab->size / mtab->fmode[TWINVQ_FT_LONG].sub,
mtab->size / mtab->fmode[TWINVQ_FT_MEDIUM].sub,
mtab->size / (mtab->fmode[TWINVQ_FT_SHORT].sub * 2),
};
wsize = types_sizes[wtype_to_wsize[wtype]];
first_wsize = wsize;
prev_buf = prev + (size - bsize) / 2;
for (j = 0; j < mtab->fmode[ftype].sub; j++) {
int sub_wtype = ftype == TWINVQ_FT_MEDIUM ? 8 : wtype;
if (!j && wtype == 4)
sub_wtype = 4;
else if (j == mtab->fmode[ftype].sub - 1 && wtype == 7)
sub_wtype = 7;
wsize = types_sizes[wtype_to_wsize[sub_wtype]];
mdct->imdct_half(mdct, buf1 + bsize * j, in + bsize * j);
tctx->fdsp.vector_fmul_window(out2, prev_buf + (bsize - wsize) / 2,
buf1 + bsize * j,
ff_sine_windows[av_log2(wsize)],
wsize / 2);
out2 += wsize;
memcpy(out2, buf1 + bsize * j + wsize / 2,
(bsize - wsize / 2) * sizeof(float));
out2 += ftype == TWINVQ_FT_MEDIUM ? (bsize - wsize) / 2 : bsize - wsize;
prev_buf = buf1 + bsize * j + bsize / 2;
}
tctx->last_block_pos[ch] = (size + first_wsize) / 2;
}示例3: apply_window_and_mdct
static void apply_window_and_mdct(AVCodecContext * avctx, const signed short * audio, int len) {
WMACodecContext *s = avctx->priv_data;
int window_index= s->frame_len_bits - s->block_len_bits;
FFTContext *mdct = &s->mdct_ctx[window_index];
int i, j, channel;
const float * win = s->windows[window_index];
int window_len = 1 << s->block_len_bits;
float n = window_len/2;
for (channel = 0; channel < avctx->channels; channel++) {
memcpy(s->output, s->frame_out[channel], sizeof(float)*window_len);
j = channel;
for (i = 0; i < len; i++, j += avctx->channels){
s->output[i+window_len] = audio[j] / n * win[window_len - i - 1];
s->frame_out[channel][i] = audio[j] / n * win[i];
}
mdct->mdct_calc(mdct, s->coefs[channel], s->output);
}
}示例4: apply_window_and_mdct
static void apply_window_and_mdct(AVCodecContext * avctx, const AVFrame *frame)
{
WMACodecContext *s = avctx->priv_data;
float **audio = (float **)frame->extended_data;
int len = frame->nb_samples;
int window_index= s->frame_len_bits - s->block_len_bits;
FFTContext *mdct = &s->mdct_ctx[window_index];
int ch;
const float * win = s->windows[window_index];
int window_len = 1 << s->block_len_bits;
float n = 2.0 * 32768.0 / window_len;
for (ch = 0; ch < avctx->channels; ch++) {
memcpy(s->output, s->frame_out[ch], window_len * sizeof(*s->output));
s->fdsp.vector_fmul_scalar(s->frame_out[ch], audio[ch], n, len);
s->dsp.vector_fmul_reverse(&s->output[window_len], s->frame_out[ch], win, len);
s->fdsp.vector_fmul(s->frame_out[ch], s->frame_out[ch], win, len);
mdct->mdct_calc(mdct, s->coefs[ch], s->output);
}
}