#include "libavcodec/avfft.h"
#include "libavutil/eval.h"
#include "audio.h"
+#include "filters.h"
#include "window_func.h"
typedef struct AFFTFiltContext {
const AVClass *class;
char *real_str;
char *img_str;
+ int fft_size;
int fft_bits;
FFTContext *fft, *ifft;
FFTComplex **fft_data;
FFTComplex **fft_temp;
int nb_exprs;
+ int channels;
int window_size;
AVExpr **real;
AVExpr **imag;
int hop_size;
float overlap;
AVFrame *buffer;
- int start, end;
+ int eof;
int win_func;
- float win_scale;
float *window_func_lut;
} AFFTFiltContext;
static const AVOption afftfilt_options[] = {
{ "real", "set channels real expressions", OFFSET(real_str), AV_OPT_TYPE_STRING, {.str = "re" }, 0, 0, A },
{ "imag", "set channels imaginary expressions", OFFSET(img_str), AV_OPT_TYPE_STRING, {.str = "im" }, 0, 0, A },
- { "win_size", "set window size", OFFSET(fft_bits), AV_OPT_TYPE_INT, {.i64=12}, 4, 17, A, "fft" },
- { "w16", 0, 0, AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, A, "fft" },
- { "w32", 0, 0, AV_OPT_TYPE_CONST, {.i64=5}, 0, 0, A, "fft" },
- { "w64", 0, 0, AV_OPT_TYPE_CONST, {.i64=6}, 0, 0, A, "fft" },
- { "w128", 0, 0, AV_OPT_TYPE_CONST, {.i64=7}, 0, 0, A, "fft" },
- { "w256", 0, 0, AV_OPT_TYPE_CONST, {.i64=8}, 0, 0, A, "fft" },
- { "w512", 0, 0, AV_OPT_TYPE_CONST, {.i64=9}, 0, 0, A, "fft" },
- { "w1024", 0, 0, AV_OPT_TYPE_CONST, {.i64=10}, 0, 0, A, "fft" },
- { "w2048", 0, 0, AV_OPT_TYPE_CONST, {.i64=11}, 0, 0, A, "fft" },
- { "w4096", 0, 0, AV_OPT_TYPE_CONST, {.i64=12}, 0, 0, A, "fft" },
- { "w8192", 0, 0, AV_OPT_TYPE_CONST, {.i64=13}, 0, 0, A, "fft" },
- { "w16384", 0, 0, AV_OPT_TYPE_CONST, {.i64=14}, 0, 0, A, "fft" },
- { "w32768", 0, 0, AV_OPT_TYPE_CONST, {.i64=15}, 0, 0, A, "fft" },
- { "w65536", 0, 0, AV_OPT_TYPE_CONST, {.i64=16}, 0, 0, A, "fft" },
- { "w131072",0, 0, AV_OPT_TYPE_CONST, {.i64=17}, 0, 0, A, "fft" },
+ { "win_size", "set window size", OFFSET(fft_size), AV_OPT_TYPE_INT, {.i64=4096}, 16, 131072, A },
{ "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, A, "win_func" },
{ "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, A, "win_func" },
{ "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, A, "win_func" },
static double imagf(void *priv, double x, double ch) { return getimag(priv, x, ch); }
static const char *const func2_names[] = { "real", "imag", NULL };
-double (*func2[])(void *, double, double) = { realf, imagf, NULL };
+static double (*const func2[])(void *, double, double) = { realf, imagf, NULL };
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
AFFTFiltContext *s = ctx->priv;
char *saveptr = NULL;
- int ret = 0, ch, i;
+ int ret = 0, ch;
float overlap;
char *args;
const char *last_expr = "1";
+ s->channels = inlink->channels;
s->pts = AV_NOPTS_VALUE;
+ s->fft_bits = av_log2(s->fft_size);
s->fft = av_fft_init(s->fft_bits, 0);
s->ifft = av_fft_init(s->fft_bits, 1);
if (!s->fft || !s->ifft)
ret = av_expr_parse(&s->real[ch], arg ? arg : last_expr, var_names,
NULL, NULL, func2_names, func2, 0, ctx);
if (ret < 0)
- break;
+ goto fail;
if (arg)
last_expr = arg;
s->nb_exprs++;
}
- av_free(args);
+ av_freep(&args);
args = av_strdup(s->img_str ? s->img_str : s->real_str);
if (!args)
return AVERROR(ENOMEM);
+ saveptr = NULL;
+ last_expr = "1";
for (ch = 0; ch < inlink->channels; ch++) {
char *arg = av_strtok(ch == 0 ? args : NULL, "|", &saveptr);
ret = av_expr_parse(&s->imag[ch], arg ? arg : last_expr, var_names,
NULL, NULL, func2_names, func2, 0, ctx);
if (ret < 0)
- break;
+ goto fail;
if (arg)
last_expr = arg;
}
- av_free(args);
+ av_freep(&args);
s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->window_size);
if (!s->fifo)
if (s->overlap == 1)
s->overlap = overlap;
- for (s->win_scale = 0, i = 0; i < s->window_size; i++) {
- s->win_scale += s->window_func_lut[i] * s->window_func_lut[i];
- }
-
s->hop_size = s->window_size * (1 - s->overlap);
if (s->hop_size <= 0)
return AVERROR(EINVAL);
if (!s->buffer)
return AVERROR(ENOMEM);
+fail:
+ av_freep(&args);
+
return ret;
}
-static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+static int filter_frame(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
AFFTFiltContext *s = ctx->priv;
const int window_size = s->window_size;
- const float f = 1. / s->win_scale;
+ const float f = 1. / (s->window_size / 2);
double values[VAR_VARS_NB];
AVFrame *out, *in = NULL;
- int ch, n, ret, i, j, k;
- int start = s->start, end = s->end;
+ int ch, n, ret, i;
- if (s->pts == AV_NOPTS_VALUE)
- s->pts = frame->pts;
+ if (!in) {
+ in = ff_get_audio_buffer(outlink, window_size);
+ if (!in)
+ return AVERROR(ENOMEM);
+ }
- ret = av_audio_fifo_write(s->fifo, (void **)frame->extended_data, frame->nb_samples);
- av_frame_free(&frame);
+ ret = av_audio_fifo_peek(s->fifo, (void **)in->extended_data, window_size);
if (ret < 0)
- return ret;
+ goto fail;
+
+ for (ch = 0; ch < inlink->channels; ch++) {
+ const float *src = (float *)in->extended_data[ch];
+ FFTComplex *fft_data = s->fft_data[ch];
- while (av_audio_fifo_size(s->fifo) >= window_size) {
- if (!in) {
- in = ff_get_audio_buffer(outlink, window_size);
- if (!in)
- return AVERROR(ENOMEM);
+ for (n = 0; n < in->nb_samples; n++) {
+ fft_data[n].re = src[n] * s->window_func_lut[n];
+ fft_data[n].im = 0;
}
- ret = av_audio_fifo_peek(s->fifo, (void **)in->extended_data, window_size);
- if (ret < 0)
- break;
+ for (; n < window_size; n++) {
+ fft_data[n].re = 0;
+ fft_data[n].im = 0;
+ }
+ }
- for (ch = 0; ch < inlink->channels; ch++) {
- const float *src = (float *)in->extended_data[ch];
- FFTComplex *fft_data = s->fft_data[ch];
+ values[VAR_PTS] = s->pts;
+ values[VAR_SAMPLE_RATE] = inlink->sample_rate;
+ values[VAR_NBBINS] = window_size / 2;
+ values[VAR_CHANNELS] = inlink->channels;
- for (n = 0; n < in->nb_samples; n++) {
- fft_data[n].re = src[n] * s->window_func_lut[n];
- fft_data[n].im = 0;
- }
+ for (ch = 0; ch < inlink->channels; ch++) {
+ FFTComplex *fft_data = s->fft_data[ch];
- for (; n < window_size; n++) {
- fft_data[n].re = 0;
- fft_data[n].im = 0;
- }
- }
+ av_fft_permute(s->fft, fft_data);
+ av_fft_calc(s->fft, fft_data);
+ }
- values[VAR_PTS] = s->pts;
- values[VAR_SAMPLE_RATE] = inlink->sample_rate;
- values[VAR_NBBINS] = window_size / 2;
- values[VAR_CHANNELS] = inlink->channels;
+ for (ch = 0; ch < inlink->channels; ch++) {
+ FFTComplex *fft_data = s->fft_data[ch];
+ FFTComplex *fft_temp = s->fft_temp[ch];
+ float *buf = (float *)s->buffer->extended_data[ch];
+ int x;
+ values[VAR_CHANNEL] = ch;
- for (ch = 0; ch < inlink->channels; ch++) {
- FFTComplex *fft_data = s->fft_data[ch];
+ for (n = 0; n <= window_size / 2; n++) {
+ float fr, fi;
- av_fft_permute(s->fft, fft_data);
- av_fft_calc(s->fft, fft_data);
- }
+ values[VAR_BIN] = n;
+ values[VAR_REAL] = fft_data[n].re;
+ values[VAR_IMAG] = fft_data[n].im;
- for (ch = 0; ch < inlink->channels; ch++) {
- FFTComplex *fft_data = s->fft_data[ch];
- FFTComplex *fft_temp = s->fft_temp[ch];
- float *buf = (float *)s->buffer->extended_data[ch];
- int x;
- values[VAR_CHANNEL] = ch;
+ fr = av_expr_eval(s->real[ch], values, s);
+ fi = av_expr_eval(s->imag[ch], values, s);
- for (n = 0; n <= window_size / 2; n++) {
- float fr, fi;
+ fft_temp[n].re = fr;
+ fft_temp[n].im = fi;
+ }
- values[VAR_BIN] = n;
- values[VAR_REAL] = fft_data[n].re;
- values[VAR_IMAG] = fft_data[n].im;
+ for (n = window_size / 2 + 1, x = window_size / 2 - 1; n < window_size; n++, x--) {
+ fft_temp[n].re = fft_temp[x].re;
+ fft_temp[n].im = -fft_temp[x].im;
+ }
- fr = av_expr_eval(s->real[ch], values, s);
- fi = av_expr_eval(s->imag[ch], values, s);
+ av_fft_permute(s->ifft, fft_temp);
+ av_fft_calc(s->ifft, fft_temp);
- fft_temp[n].re = fr;
- fft_temp[n].im = fi;
- }
+ for (i = 0; i < window_size; i++) {
+ buf[i] += s->fft_temp[ch][i].re * f;
+ }
+ }
- for (n = window_size / 2 + 1, x = window_size / 2 - 1; n < window_size; n++, x--) {
- fft_temp[n].re = fft_temp[x].re;
- fft_temp[n].im = -fft_temp[x].im;
- }
+ out = ff_get_audio_buffer(outlink, s->hop_size);
+ if (!out) {
+ ret = AVERROR(ENOMEM);
+ goto fail;
+ }
- av_fft_permute(s->ifft, fft_temp);
- av_fft_calc(s->ifft, fft_temp);
+ out->pts = s->pts;
+ s->pts += av_rescale_q(s->hop_size, (AVRational){1, outlink->sample_rate}, outlink->time_base);
- start = s->start;
- end = s->end;
- k = end;
- for (i = 0, j = start; j < k && i < window_size; i++, j++) {
- buf[j] += s->fft_temp[ch][i].re * f;
- }
+ for (ch = 0; ch < inlink->channels; ch++) {
+ float *dst = (float *)out->extended_data[ch];
+ float *buf = (float *)s->buffer->extended_data[ch];
- for (; i < window_size; i++, j++) {
- buf[j] = s->fft_temp[ch][i].re * f;
- }
+ for (n = 0; n < s->hop_size; n++)
+ dst[n] = buf[n] * (1.f - s->overlap);
+ memmove(buf, buf + s->hop_size, window_size * 4);
+ }
- start += s->hop_size;
- end = j;
- }
+ ret = ff_filter_frame(outlink, out);
+ if (ret < 0)
+ goto fail;
- s->start = start;
- s->end = end;
+ av_audio_fifo_drain(s->fifo, s->hop_size);
- if (start >= window_size) {
- float *dst, *buf;
+fail:
+ av_frame_free(&in);
+ return ret < 0 ? ret : 0;
+}
- start -= window_size;
- end -= window_size;
+static int activate(AVFilterContext *ctx)
+{
+ AVFilterLink *inlink = ctx->inputs[0];
+ AVFilterLink *outlink = ctx->outputs[0];
+ AFFTFiltContext *s = ctx->priv;
+ AVFrame *in = NULL;
+ int ret = 0, status;
+ int64_t pts;
- s->start = start;
- s->end = end;
+ FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
- out = ff_get_audio_buffer(outlink, window_size);
- if (!out) {
- ret = AVERROR(ENOMEM);
- break;
- }
+ if (!s->eof && av_audio_fifo_size(s->fifo) < s->window_size) {
+ ret = ff_inlink_consume_frame(inlink, &in);
+ if (ret < 0)
+ return ret;
- out->pts = s->pts;
- s->pts += window_size;
+ if (ret > 0) {
+ ret = av_audio_fifo_write(s->fifo, (void **)in->extended_data,
+ in->nb_samples);
+ if (ret >= 0 && s->pts == AV_NOPTS_VALUE)
+ s->pts = in->pts;
- for (ch = 0; ch < inlink->channels; ch++) {
- dst = (float *)out->extended_data[ch];
- buf = (float *)s->buffer->extended_data[ch];
+ av_frame_free(&in);
+ if (ret < 0)
+ return ret;
+ }
+ }
- for (n = 0; n < window_size; n++) {
- dst[n] = buf[n] * (1 - s->overlap);
- }
- memmove(buf, buf + window_size, window_size * 4);
- }
+ if ((av_audio_fifo_size(s->fifo) >= s->window_size) ||
+ (av_audio_fifo_size(s->fifo) > 0 && s->eof)) {
+ ret = filter_frame(inlink);
+ if (av_audio_fifo_size(s->fifo) >= s->window_size)
+ ff_filter_set_ready(ctx, 100);
+ return ret;
+ }
- ret = ff_filter_frame(outlink, out);
- if (ret < 0)
- break;
+ if (!s->eof && ff_inlink_acknowledge_status(inlink, &status, &pts)) {
+ if (status == AVERROR_EOF) {
+ s->eof = 1;
+ if (av_audio_fifo_size(s->fifo) >= 0) {
+ ff_filter_set_ready(ctx, 100);
+ return 0;
+ }
}
+ }
- av_audio_fifo_drain(s->fifo, s->hop_size);
+ if (s->eof && av_audio_fifo_size(s->fifo) <= 0) {
+ ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
+ return 0;
}
- av_frame_free(&in);
- return ret < 0 ? ret : 0;
+ if (!s->eof)
+ FF_FILTER_FORWARD_WANTED(outlink, inlink);
+
+ return FFERROR_NOT_READY;
}
static int query_formats(AVFilterContext *ctx)
av_fft_end(s->fft);
av_fft_end(s->ifft);
- for (i = 0; i < s->nb_exprs; i++) {
+ for (i = 0; i < s->channels; i++) {
if (s->fft_data)
av_freep(&s->fft_data[i]);
if (s->fft_temp)
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_input,
- .filter_frame = filter_frame,
},
{ NULL }
};
{ NULL }
};
-AVFilter ff_af_afftfilt = {
+const AVFilter ff_af_afftfilt = {
.name = "afftfilt",
.description = NULL_IF_CONFIG_SMALL("Apply arbitrary expressions to samples in frequency domain."),
.priv_size = sizeof(AFFTFiltContext),
.priv_class = &afftfilt_class,
.inputs = inputs,
.outputs = outputs,
+ .activate = activate,
.query_formats = query_formats,
.uninit = uninit,
};
projects / ffmpeg / blobdiff