bpa wrote:
> I don't use displays and its been a long time since I looked at the
> source code. I always thought "VU" stood for Volume Units and when I
> used tape recorders the VU meter was always affected by volume level and
> I assumed the same for SB player.
>
> A quick look now at output_vis.c - PCM data is shared with the
> "visualise" via shared memory and no FFT processing is done within
> squeezelite - just copying audio data.
>
> Since audio gets out of DAC - PCM samples are not clearly not reduced to
> zero - but current theory is that it seems PCM data is not shared with
> device with no Volume Control
>
> In output_vis.c - there is a boolean "silence" that needs to be checked
> out as it stops sharing of PCM data.
> There is also some processing of PCM sample due to a replay gain
> setting.
> >
Code:
--------------------
> >
> if (silence) {
> vis_mmap->running = false;
> } else {
> frames_t vis_cnt = out_frames;
> s32_t *ptr = (s32_t *) outputbuf->readp;
> unsigned i = vis_mmap->buf_index;
>
> if (!output->current_replay_gain) {
> while (vis_cnt--) {
> vis_mmap->buffer[i++] = *(ptr++) >> 16;
> vis_mmap->buffer[i++] = *(ptr++) >> 16;
> if (i == VIS_BUF_SIZE) i = 0;
> }
> } else {
> while (vis_cnt--) {
> vis_mmap->buffer[i++] = gain(*(ptr++), output->current_replay_gain) >> 16;
> vis_mmap->buffer[i++] = gain(*(ptr++), output->current_replay_gain) >> 16;
>
> if (i == VIS_BUF_SIZE) i = 0;
> }
> }
>
> vis_mmap->updated = time(NULL);
> vis_mmap->running = true;
> vis_mmap->buf_index = i;
> vis_mmap->rate = output->current_sample_rate;
> }
>
--------------------
> > I just checked on the Touch and noticed that although the volume setting
in LMS doesn't affect the VU meters, replaygain does affect them.
Sent from my Pixel 3a using Tapatalk
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