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authorMax Kellermann <max@duempel.org>2010-03-10 19:18:51 +0100
committerMax Kellermann <max@duempel.org>2010-03-10 19:48:34 +0100
commit41a4662c8ccce7a22ff9d05ecf40d3ce7de29305 (patch)
tree440dca2d40be8c09d7bd9a31702ec0bcc2335bba /src/output
parent5842015b901492e4af15a72ff4d4f2f705095a25 (diff)
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output/jack: synchronize all channels
Always use the same number of samples from each channel's ring buffer. This ensures that all channels are kept in sync.
Diffstat (limited to 'src/output')
-rw-r--r--src/output/jack_output_plugin.c35
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 */