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avfilter/af_surround: scale output gain for non-default overlap

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This commit is contained in:
Paul B Mahol 2023-05-12 12:06:23 +02:00
parent 09cd89df27
commit cb4e7831e7
1 changed files with 20 additions and 2 deletions
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22
libavfilter/af_surround.c
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@ -74,6 +74,7 @@ typedef struct AudioSurroundContext {
float focus;
int win_size;
int win_func;
float win_gain;
float overlap;
float all_x;
@ -637,7 +638,7 @@ static void upmix_7_1_5_0_side(AVFilterContext *ctx,
{
float fl_mag, fr_mag, ls_mag, rs_mag, lb_mag, rb_mag;
float *dstc, *dstl, *dstr, *dstls, *dstrs, *dstlb, *dstrb, *dstlfe;
float lfe_mag, c_phase, mag_total = (mag_totall + mag_totalr) * 0.5;
float lfe_mag, c_phase, mag_total = (mag_totall + mag_totalr) * 0.5f;
AudioSurroundContext *s = ctx->priv;
dstl = (float *)s->output->extended_data[0];
@ -1197,6 +1198,23 @@ fail:
s->window_func_lut[i] = sqrtf(s->window_func_lut[i] / s->win_size);
s->hop_size = FFMAX(1, s->win_size * (1. - s->overlap));
{
float max = 0.f, *temp_lut = av_calloc(s->win_size, sizeof(*temp_lut));
if (!temp_lut)
return AVERROR(ENOMEM);
for (int j = 0; j < s->win_size; j += s->hop_size) {
for (int i = 0; i < s->win_size; i++)
temp_lut[(i + j) % s->win_size] += s->window_func_lut[i];
}
for (int i = 0; i < s->win_size; i++)
max = fmaxf(temp_lut[i], max);
av_freep(&temp_lut);
s->win_gain = 1.f / (max * sqrtf(s->win_size));
}
allchannels_spread(ctx);
return 0;
@ -1237,7 +1255,7 @@ static int fft_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static int ifft_channel(AVFilterContext *ctx, AVFrame *out, int ch)
{
AudioSurroundContext *s = ctx->priv;
const float level_out = s->output_levels[ch];
const float level_out = s->output_levels[ch] * s->win_gain;
float *dst, *ptr;
dst = (float *)s->output_out->extended_data[ch];