[FFmpeg-devel] [PATCH] avfilter/af_atempo: switch to rdft from lavu/tx
Pavel Koshevoy
pkoshevoy at gmail.com
Sun Feb 6 19:15:37 EET 2022
On Sun, Feb 6, 2022 at 4:24 AM Paul B Mahol <onemda at gmail.com> wrote:
> Signed-off-by: Paul B Mahol <onemda at gmail.com>
> ---
> configure | 3 -
> libavfilter/af_atempo.c | 126 ++++++++++++++++++++--------------------
> 2 files changed, 64 insertions(+), 65 deletions(-)
>
> diff --git a/configure b/configure
> index 5a8b52c77d..6ec25dd622 100755
> --- a/configure
> +++ b/configure
> @@ -3610,8 +3610,6 @@ amovie_filter_deps="avcodec avformat"
> aresample_filter_deps="swresample"
> asr_filter_deps="pocketsphinx"
> ass_filter_deps="libass"
> -atempo_filter_deps="avcodec"
> -atempo_filter_select="rdft"
> avgblur_opencl_filter_deps="opencl"
> avgblur_vulkan_filter_deps="vulkan spirv_compiler"
> azmq_filter_deps="libzmq"
> @@ -7387,7 +7385,6 @@ enabled zlib && add_cppflags -DZLIB_CONST
> # conditional library dependencies, in any order
> enabled amovie_filter && prepend avfilter_deps "avformat avcodec"
> enabled aresample_filter && prepend avfilter_deps "swresample"
> -enabled atempo_filter && prepend avfilter_deps "avcodec"
> enabled bm3d_filter && prepend avfilter_deps "avcodec"
> enabled cover_rect_filter && prepend avfilter_deps "avformat avcodec"
> enabled ebur128_filter && enabled swresample && prepend avfilter_deps
> "swresample"
> diff --git a/libavfilter/af_atempo.c b/libavfilter/af_atempo.c
> index e9a6da7970..27f2f6daa0 100644
> --- a/libavfilter/af_atempo.c
> +++ b/libavfilter/af_atempo.c
> @@ -39,13 +39,13 @@
> */
>
> #include <float.h>
> -#include "libavcodec/avfft.h"
> #include "libavutil/avassert.h"
> #include "libavutil/avstring.h"
> #include "libavutil/channel_layout.h"
> #include "libavutil/eval.h"
> #include "libavutil/opt.h"
> #include "libavutil/samplefmt.h"
> +#include "libavutil/tx.h"
> #include "avfilter.h"
> #include "audio.h"
> #include "internal.h"
> @@ -67,7 +67,8 @@ typedef struct AudioFragment {
>
> // rDFT transform of the down-mixed mono fragment, used for
> // fast waveform alignment via correlation in frequency domain:
> - FFTSample *xdat;
> + float *xdat_in;
> + float *xdat;
> } AudioFragment;
>
>
Is the old API being removed or deprecated?
Just wondering why this change is necessary.
> /**
> @@ -140,9 +141,11 @@ typedef struct ATempoContext {
> FilterState state;
>
> // for fast correlation calculation in frequency domain:
> - RDFTContext *real_to_complex;
> - RDFTContext *complex_to_real;
> - FFTSample *correlation;
> + AVTXContext *real_to_complex;
> + AVTXContext *complex_to_real;
> + av_tx_fn r2c_fn, c2r_fn;
> + float *correlation_in;
> + float *correlation;
>
> // for managing AVFilterPad.request_frame and AVFilterPad.filter_frame
> AVFrame *dst_buffer;
> @@ -228,18 +231,18 @@ static void yae_release_buffers(ATempoContext
> *atempo)
>
> av_freep(&atempo->frag[0].data);
> av_freep(&atempo->frag[1].data);
> + av_freep(&atempo->frag[0].xdat_in);
> + av_freep(&atempo->frag[1].xdat_in);
> av_freep(&atempo->frag[0].xdat);
> av_freep(&atempo->frag[1].xdat);
>
> av_freep(&atempo->buffer);
> av_freep(&atempo->hann);
> + av_freep(&atempo->correlation_in);
> av_freep(&atempo->correlation);
>
> - av_rdft_end(atempo->real_to_complex);
> - atempo->real_to_complex = NULL;
> -
> - av_rdft_end(atempo->complex_to_real);
> - atempo->complex_to_real = NULL;
> + av_tx_uninit(&atempo->real_to_complex);
> + av_tx_uninit(&atempo->complex_to_real);
> }
>
> /* av_realloc is not aligned enough; fortunately, the data does not need
> to
> @@ -247,7 +250,7 @@ static void yae_release_buffers(ATempoContext *atempo)
> #define RE_MALLOC_OR_FAIL(field, field_size) \
> do { \
> av_freep(&field); \
> - field = av_malloc(field_size); \
> + field = av_calloc(field_size, 1); \
> if (!field) { \
> yae_release_buffers(atempo); \
> return AVERROR(ENOMEM); \
> @@ -265,6 +268,7 @@ static int yae_reset(ATempoContext *atempo,
> {
> const int sample_size = av_get_bytes_per_sample(format);
> uint32_t nlevels = 0;
> + float scale = 1.f, iscale = 1.f;
> uint32_t pot;
> int i;
>
> @@ -288,29 +292,29 @@ static int yae_reset(ATempoContext *atempo,
> // initialize audio fragment buffers:
> RE_MALLOC_OR_FAIL(atempo->frag[0].data, atempo->window *
> atempo->stride);
> RE_MALLOC_OR_FAIL(atempo->frag[1].data, atempo->window *
> atempo->stride);
> - RE_MALLOC_OR_FAIL(atempo->frag[0].xdat, atempo->window *
> sizeof(FFTComplex));
> - RE_MALLOC_OR_FAIL(atempo->frag[1].xdat, atempo->window *
> sizeof(FFTComplex));
> + RE_MALLOC_OR_FAIL(atempo->frag[0].xdat_in, (atempo->window + 1) *
> sizeof(AVComplexFloat));
> + RE_MALLOC_OR_FAIL(atempo->frag[1].xdat_in, (atempo->window + 1) *
> sizeof(AVComplexFloat));
> + RE_MALLOC_OR_FAIL(atempo->frag[0].xdat, (atempo->window + 1) *
> sizeof(AVComplexFloat));
> + RE_MALLOC_OR_FAIL(atempo->frag[1].xdat, (atempo->window + 1) *
> sizeof(AVComplexFloat));
>
> // initialize rDFT contexts:
> - av_rdft_end(atempo->real_to_complex);
> - atempo->real_to_complex = NULL;
> -
> - av_rdft_end(atempo->complex_to_real);
> - atempo->complex_to_real = NULL;
> + av_tx_uninit(&atempo->real_to_complex);
> + av_tx_uninit(&atempo->complex_to_real);
>
> - atempo->real_to_complex = av_rdft_init(nlevels + 1, DFT_R2C);
> + av_tx_init(&atempo->real_to_complex, &atempo->r2c_fn,
> AV_TX_FLOAT_RDFT, 0, 1 << (nlevels + 1), &scale, 0);
> if (!atempo->real_to_complex) {
> yae_release_buffers(atempo);
> return AVERROR(ENOMEM);
> }
>
> - atempo->complex_to_real = av_rdft_init(nlevels + 1, IDFT_C2R);
> + av_tx_init(&atempo->complex_to_real, &atempo->c2r_fn,
> AV_TX_FLOAT_RDFT, 1, 1 << (nlevels + 1), &iscale, 0);
> if (!atempo->complex_to_real) {
> yae_release_buffers(atempo);
> return AVERROR(ENOMEM);
> }
>
> - RE_MALLOC_OR_FAIL(atempo->correlation, atempo->window *
> sizeof(FFTComplex));
> + RE_MALLOC_OR_FAIL(atempo->correlation_in, (atempo->window + 1) *
> sizeof(AVComplexFloat));
> + RE_MALLOC_OR_FAIL(atempo->correlation, atempo->window *
> sizeof(AVComplexFloat));
>
> atempo->ring = atempo->window * 3;
> RE_MALLOC_OR_FAIL(atempo->buffer, atempo->ring * atempo->stride);
> @@ -348,7 +352,7 @@ static int yae_update(AVFilterContext *ctx)
> const uint8_t *src_end = src + \
> frag->nsamples * atempo->channels * sizeof(scalar_type); \
> \
> - FFTSample *xdat = frag->xdat; \
> + float *xdat = frag->xdat_in; \
> scalar_type tmp; \
> \
> if (atempo->channels == 1) { \
> @@ -356,27 +360,27 @@ static int yae_update(AVFilterContext *ctx)
> tmp = *(const scalar_type *)src; \
> src += sizeof(scalar_type); \
> \
> - *xdat = (FFTSample)tmp; \
> + *xdat = (float)tmp; \
> } \
> } else { \
> - FFTSample s, max, ti, si; \
> + float s, max, ti, si; \
> int i; \
> \
> for (; src < src_end; xdat++) { \
> tmp = *(const scalar_type *)src; \
> src += sizeof(scalar_type); \
> \
> - max = (FFTSample)tmp; \
> - s = FFMIN((FFTSample)scalar_max, \
> - (FFTSample)fabsf(max)); \
> + max = (float)tmp; \
> + s = FFMIN((float)scalar_max, \
> + (float)fabsf(max)); \
> \
> for (i = 1; i < atempo->channels; i++) { \
> tmp = *(const scalar_type *)src; \
> src += sizeof(scalar_type); \
> \
> - ti = (FFTSample)tmp; \
> - si = FFMIN((FFTSample)scalar_max, \
> - (FFTSample)fabsf(ti)); \
> + ti = (float)tmp; \
> + si = FFMIN((float)scalar_max, \
> + (float)fabsf(ti)); \
> \
> if (s < si) { \
> s = si; \
> @@ -399,7 +403,7 @@ static void yae_downmix(ATempoContext *atempo,
> AudioFragment *frag)
> const uint8_t *src = frag->data;
>
> // init complex data buffer used for FFT and Correlation:
> - memset(frag->xdat, 0, sizeof(FFTComplex) * atempo->window);
> + memset(frag->xdat_in, 0, sizeof(AVComplexFloat) * atempo->window);
>
> if (atempo->format == AV_SAMPLE_FMT_U8) {
> yae_init_xdat(uint8_t, 127);
> @@ -598,32 +602,24 @@ static void yae_advance_to_next_frag(ATempoContext
> *atempo)
> * Multiply two vectors of complex numbers (result of real_to_complex
> rDFT)
> * and transform back via complex_to_real rDFT.
> */
> -static void yae_xcorr_via_rdft(FFTSample *xcorr,
> - RDFTContext *complex_to_real,
> - const FFTComplex *xa,
> - const FFTComplex *xb,
> +static void yae_xcorr_via_rdft(float *xcorr_in,
> + float *xcorr,
> + AVTXContext *complex_to_real,
> + av_tx_fn c2r_fn,
> + const AVComplexFloat *xa,
> + const AVComplexFloat *xb,
> const int window)
> {
> - FFTComplex *xc = (FFTComplex *)xcorr;
> + AVComplexFloat *xc = (AVComplexFloat *)xcorr_in;
> int i;
>
> - // NOTE: first element requires special care -- Given Y = rDFT(X),
> - // Im(Y[0]) and Im(Y[N/2]) are always zero, therefore av_rdft_calc
> - // stores Re(Y[N/2]) in place of Im(Y[0]).
> -
> - xc->re = xa->re * xb->re;
> - xc->im = xa->im * xb->im;
> - xa++;
> - xb++;
> - xc++;
> -
> - for (i = 1; i < window; i++, xa++, xb++, xc++) {
> + for (i = 0; i <= window; i++, xa++, xb++, xc++) {
>
This used to iterate over [1, window - 1] elements.
Now it iterates over [0, window] elements.
Is this correct? That's 2 additional elements.
> xc->re = (xa->re * xb->re + xa->im * xb->im);
> xc->im = (xa->im * xb->re - xa->re * xb->im);
> }
>
> // apply inverse rDFT:
> - av_rdft_calc(complex_to_real, xcorr);
> + c2r_fn(complex_to_real, xcorr, xcorr_in, sizeof(float));
> }
>
> /**
> @@ -637,21 +633,25 @@ static int yae_align(AudioFragment *frag,
> const int window,
> const int delta_max,
> const int drift,
> - FFTSample *correlation,
> - RDFTContext *complex_to_real)
> + float *correlation_in,
> + float *correlation,
> + AVTXContext *complex_to_real,
> + av_tx_fn c2r_fn)
> {
> int best_offset = -drift;
> - FFTSample best_metric = -FLT_MAX;
> - FFTSample *xcorr;
> + float best_metric = -FLT_MAX;
> + float *xcorr;
>
> int i0;
> int i1;
> int i;
>
> - yae_xcorr_via_rdft(correlation,
> + yae_xcorr_via_rdft(correlation_in,
> + correlation,
> complex_to_real,
> - (const FFTComplex *)prev->xdat,
> - (const FFTComplex *)frag->xdat,
> + c2r_fn,
> + (const AVComplexFloat *)prev->xdat,
> + (const AVComplexFloat *)frag->xdat,
> window);
>
> // identify search window boundaries:
> @@ -665,11 +665,11 @@ static int yae_align(AudioFragment *frag,
> xcorr = correlation + i0;
>
> for (i = i0; i < i1; i++, xcorr++) {
> - FFTSample metric = *xcorr;
> + float metric = *xcorr;
>
> // normalize:
> - FFTSample drifti = (FFTSample)(drift + i);
> - metric *= drifti * (FFTSample)(i - i0) * (FFTSample)(i1 - i);
> + float drifti = (float)(drift + i);
> + metric *= drifti * (float)(i - i0) * (float)(i1 - i);
>
> if (metric > best_metric) {
> best_metric = metric;
> @@ -706,8 +706,10 @@ static int yae_adjust_position(ATempoContext *atempo)
> atempo->window,
> delta_max,
> drift,
> + atempo->correlation_in,
> atempo->correlation,
> - atempo->complex_to_real);
> + atempo->complex_to_real,
> + atempo->c2r_fn);
>
> if (correction) {
> // adjust fragment position:
> @@ -833,7 +835,7 @@ yae_apply(ATempoContext *atempo,
> yae_downmix(atempo, yae_curr_frag(atempo));
>
> // apply rDFT:
> - av_rdft_calc(atempo->real_to_complex,
> yae_curr_frag(atempo)->xdat);
> + atempo->r2c_fn(atempo->real_to_complex,
> yae_curr_frag(atempo)->xdat, yae_curr_frag(atempo)->xdat_in, sizeof(float));
>
> // must load the second fragment before alignment can start:
> if (!atempo->nfrag) {
> @@ -865,7 +867,7 @@ yae_apply(ATempoContext *atempo,
> yae_downmix(atempo, yae_curr_frag(atempo));
>
> // apply rDFT:
> - av_rdft_calc(atempo->real_to_complex,
> yae_curr_frag(atempo)->xdat);
> + atempo->r2c_fn(atempo->real_to_complex,
> yae_curr_frag(atempo)->xdat, yae_curr_frag(atempo)->xdat_in, sizeof(float));
>
> atempo->state = YAE_OUTPUT_OVERLAP_ADD;
> }
> @@ -929,7 +931,7 @@ static int yae_flush(ATempoContext *atempo,
> yae_downmix(atempo, frag);
>
> // apply rDFT:
> - av_rdft_calc(atempo->real_to_complex, frag->xdat);
> + atempo->r2c_fn(atempo->real_to_complex, frag->xdat,
> frag->xdat_in, sizeof(float));
>
> // align current fragment to previous fragment:
> if (yae_adjust_position(atempo)) {
> --
> 2.33.0
>
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