diff options
Diffstat (limited to 'src/output/jack_output_plugin.c')
| -rw-r--r-- | src/output/jack_output_plugin.c | 35 |
1 files changed, 26 insertions, 9 deletions
diff --git a/src/output/jack_output_plugin.c b/src/output/jack_output_plugin.c index 9a714af2f..5a89d7919 100644 --- a/src/output/jack_output_plugin.c +++ b/src/output/jack_output_plugin.c @@ -88,12 +88,31 @@ jack_output_quark(void) return g_quark_from_static_string("jack_output"); } +/** + * Determine the number of frames guaranteed to be available on all + * channels. + */ +static jack_nframes_t +mpd_jack_available(const struct jack_data *jd) +{ + size_t min = jack_ringbuffer_read_space(jd->ringbuffer[0]); + + for (unsigned i = 1; i < jd->audio_format.channels; ++i) { + size_t current = jack_ringbuffer_read_space(jd->ringbuffer[i]); + if (current < min) + min = current; + } + + assert(min % sample_size == 0); + + return min / sample_size; +} + static int mpd_jack_process(jack_nframes_t nframes, void *arg) { struct jack_data *jd = (struct jack_data *) arg; jack_default_audio_sample_t *out; - size_t available; if (nframes <= 0) return 0; @@ -111,20 +130,18 @@ mpd_jack_process(jack_nframes_t nframes, void *arg) return 0; } - for (unsigned i = 0; i < jd->audio_format.channels; ++i) { - available = jack_ringbuffer_read_space(jd->ringbuffer[i]); - assert(available % sample_size == 0); - available /= sample_size; - if (available > nframes) - available = nframes; + jack_nframes_t available = mpd_jack_available(jd); + if (available > nframes) + available = nframes; + for (unsigned i = 0; i < jd->audio_format.channels; ++i) { out = jack_port_get_buffer(jd->ports[i], nframes); jack_ringbuffer_read(jd->ringbuffer[i], (char *)out, available * sample_size); - while (available < nframes) + for (jack_nframes_t f = available; f < nframes; ++f) /* ringbuffer underrun, fill with silence */ - out[available++] = 0.0; + out[f] = 0.0; } /* generate silence for the unused source ports */ |