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-rw-r--r--src/output/plugins/JackOutputPlugin.cxx113
1 files changed, 73 insertions, 40 deletions
diff --git a/src/output/plugins/JackOutputPlugin.cxx b/src/output/plugins/JackOutputPlugin.cxx
index 99de03fb3..ba05e6c5e 100644
--- a/src/output/plugins/JackOutputPlugin.cxx
+++ b/src/output/plugins/JackOutputPlugin.cxx
@@ -21,6 +21,7 @@
#include "JackOutputPlugin.hxx"
#include "../OutputAPI.hxx"
#include "config/ConfigError.hxx"
+#include "util/ConstBuffer.hxx"
#include "util/SplitString.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
@@ -137,6 +138,71 @@ JackOutput::GetAvailable() const
return min / jack_sample_size;
}
+/**
+ * Call jack_ringbuffer_read_advance() on all buffers in the list.
+ */
+static void
+MultiReadAdvance(ConstBuffer<jack_ringbuffer_t *> buffers,
+ size_t size)
+{
+ for (auto *i : buffers)
+ jack_ringbuffer_read_advance(i, size);
+}
+
+/**
+ * Write a specific amount of "silence" to the given port.
+ */
+static void
+WriteSilence(jack_port_t &port, jack_nframes_t nframes)
+{
+ jack_default_audio_sample_t *out =
+ (jack_default_audio_sample_t *)
+ jack_port_get_buffer(&port, nframes);
+ if (out == nullptr)
+ /* workaround for libjack1 bug: if the server
+ connection fails, the process callback is invoked
+ anyway, but unable to get a buffer */
+ return;
+
+ std::fill_n(out, nframes, 0.0);
+}
+
+/**
+ * Write a specific amount of "silence" to all ports in the list.
+ */
+static void
+MultiWriteSilence(ConstBuffer<jack_port_t *> ports, jack_nframes_t nframes)
+{
+ for (auto *i : ports)
+ WriteSilence(*i, nframes);
+}
+
+/**
+ * Copy data from the buffer to the port. If the buffer underruns,
+ * fill with silence.
+ */
+static void
+Copy(jack_port_t &dest, jack_nframes_t nframes,
+ jack_ringbuffer_t &src, jack_nframes_t available)
+{
+ jack_default_audio_sample_t *out =
+ (jack_default_audio_sample_t *)
+ jack_port_get_buffer(&dest, nframes);
+ if (out == nullptr)
+ /* workaround for libjack1 bug: if the server
+ connection fails, the process callback is
+ invoked anyway, but unable to get a
+ buffer */
+ return;
+
+ /* copy from buffer to port */
+ jack_ringbuffer_read(&src, (char *)out,
+ available * jack_sample_size);
+
+ /* ringbuffer underrun, fill with silence */
+ std::fill(out + available, out + nframes, 0.0);
+}
+
inline void
JackOutput::Process(jack_nframes_t nframes)
{
@@ -150,19 +216,12 @@ JackOutput::Process(jack_nframes_t nframes)
if (pause) {
/* empty the ring buffers */
- for (unsigned i = 0; i < n_channels; ++i)
- jack_ringbuffer_read_advance(ringbuffer[i],
- available * jack_sample_size);
+ MultiReadAdvance({ringbuffer, n_channels},
+ available * jack_sample_size);
/* generate silence while MPD is paused */
- for (unsigned i = 0; i < n_channels; ++i) {
- jack_default_audio_sample_t *out =
- (jack_default_audio_sample_t *)
- jack_port_get_buffer(ports[i], nframes);
-
- std::fill_n(out, nframes, 0.0);
- }
+ MultiWriteSilence({ports, n_channels}, nframes);
return;
}
@@ -170,39 +229,13 @@ JackOutput::Process(jack_nframes_t nframes)
if (available > nframes)
available = nframes;
- for (unsigned i = 0; i < n_channels; ++i) {
- jack_default_audio_sample_t *out =
- (jack_default_audio_sample_t *)
- jack_port_get_buffer(ports[i], nframes);
- if (out == nullptr)
- /* workaround for libjack1 bug: if the server
- connection fails, the process callback is
- invoked anyway, but unable to get a
- buffer */
- continue;
-
- jack_ringbuffer_read(ringbuffer[i],
- (char *)out, available * jack_sample_size);
-
- /* ringbuffer underrun, fill with silence */
- std::fill(out + available, out + nframes, 0.0);
- }
+ for (unsigned i = 0; i < n_channels; ++i)
+ Copy(*ports[i], nframes, *ringbuffer[i], available);
/* generate silence for the unused source ports */
- for (unsigned i = n_channels; i < num_source_ports; ++i) {
- jack_default_audio_sample_t *out =
- (jack_default_audio_sample_t *)
- jack_port_get_buffer(ports[i], nframes);
- if (out == nullptr)
- /* workaround for libjack1 bug: if the server
- connection fails, the process callback is
- invoked anyway, but unable to get a
- buffer */
- continue;
-
- std::fill_n(out, nframes, 0.0);
- }
+ MultiWriteSilence({ports + n_channels, num_source_ports - n_channels},
+ nframes);
}
static int