commit 6fdd4d82884111635c69fbe6565d54aaabc8e4d2
author Sebastian Dröge <sebastian@centricular.com> Fri Aug 26 14:08:11 2016 +0300
committer Sebastian Dröge <sebastian@centricular.com> Fri Aug 26 15:49:40 2016 +0300
tree b27c8041f97e4815466add16163b8648974b0691
parent 7898bc581053b1716e9d7ecaeb148ec8d60d1c29

decklinkaudiosink: Add support for 8 and 16 channels

sys/decklink/gstdecklink.cpp

diff --git a/sys/decklink/gstdecklink.cpp b/sys/decklink/gstdecklink.cpp
index 930e98b..c8eb7b3 100644
--- a/sys/decklink/gstdecklink.cpp
+++ b/sys/decklink/gstdecklink.cpp
@@ -945,6 +945,7 @@
 
     ret = decklink->QueryInterface (IID_IDeckLinkAttributes,
         (void **) &devices[i].input.attributes);
+    devices[i].output.attributes = devices[i].input.attributes;
     if (ret != S_OK) {
       GST_WARNING ("selected device does not have attributes interface");
     }

sys/decklink/gstdecklink.h

diff --git a/sys/decklink/gstdecklink.h b/sys/decklink/gstdecklink.h
index 81e9b7c..9f95c56 100644
--- a/sys/decklink/gstdecklink.h
+++ b/sys/decklink/gstdecklink.h
@@ -167,6 +167,7 @@
 struct _GstDecklinkOutput {
   IDeckLink *device;
   IDeckLinkOutput *output;
+  IDeckLinkAttributes *attributes;
   GstClock *clock;
   GstClockTime clock_start_time, clock_last_time, clock_epoch;
   GstClockTimeDiff clock_offset;

sys/decklink/gstdecklinkaudiosink.cpp

diff --git a/sys/decklink/gstdecklinkaudiosink.cpp b/sys/decklink/gstdecklinkaudiosink.cpp
index 54cb257..b4c34e7 100644
--- a/sys/decklink/gstdecklinkaudiosink.cpp
+++ b/sys/decklink/gstdecklinkaudiosink.cpp
@@ -409,7 +409,7 @@
   }
 
   ret = self->output->output->EnableAudioOutput (bmdAudioSampleRate48kHz,
-      sample_depth, 2, bmdAudioOutputStreamContinuous);
+      sample_depth, spec->info.channels, bmdAudioOutputStreamContinuous);
   if (ret != S_OK) {
     GST_WARNING_OBJECT (self->sink, "Failed to enable audio output 0x%08x",
         ret);
@@ -517,7 +517,7 @@
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS
-    ("audio/x-raw, format={S16LE,S32LE}, channels=2, rate=48000, "
+    ("audio/x-raw, format={S16LE,S32LE}, channels={2, 8, 16}, rate=48000, "
         "layout=interleaved")
     );
 
@@ -529,7 +529,7 @@
 
 static GstStateChangeReturn gst_decklink_audio_sink_change_state (GstElement *
     element, GstStateChange transition);
-
+static GstCaps * gst_decklink_audio_sink_get_caps (GstBaseSink * bsink, GstCaps * filter);
 static GstAudioRingBuffer
     * gst_decklink_audio_sink_create_ringbuffer (GstAudioBaseSink * absink);
 
@@ -542,6 +542,7 @@
 {
   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
   GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+  GstBaseSinkClass *basesink_class = GST_BASE_SINK_CLASS (klass);
   GstAudioBaseSinkClass *audiobasesink_class =
       GST_AUDIO_BASE_SINK_CLASS (klass);
 
@@ -552,6 +553,8 @@
   element_class->change_state =
       GST_DEBUG_FUNCPTR (gst_decklink_audio_sink_change_state);
 
+  basesink_class->get_caps = GST_DEBUG_FUNCPTR (gst_decklink_audio_sink_get_caps);
+
   audiobasesink_class->create_ringbuffer =
       GST_DEBUG_FUNCPTR (gst_decklink_audio_sink_create_ringbuffer);
 
@@ -651,6 +654,62 @@
   return ret;
 }
 
+static GstCaps *
+gst_decklink_audio_sink_get_caps (GstBaseSink * bsink, GstCaps * filter)
+{
+  GstDecklinkAudioSink *self = GST_DECKLINK_AUDIO_SINK_CAST (bsink);
+  GstDecklinkAudioSinkRingBuffer *buf =
+      GST_DECKLINK_AUDIO_SINK_RING_BUFFER_CAST (GST_AUDIO_BASE_SINK_CAST
+      (self)->ringbuffer);
+  GstCaps *caps = gst_pad_get_pad_template_caps (GST_BASE_SINK_PAD (bsink));
+
+  if (buf) {
+    GST_OBJECT_LOCK (buf);
+    if (buf->output && buf->output->attributes) {
+      gint64 max_channels = 0;
+      HRESULT ret;
+      GstStructure *s;
+      GValue arr = G_VALUE_INIT;
+      GValue v = G_VALUE_INIT;
+
+      ret = buf->output->attributes->GetInt (BMDDeckLinkMaximumAudioChannels, &max_channels);
+      /* 2 should always be supported */
+      if (ret != S_OK) {
+        max_channels = 2;
+      }
+
+      caps = gst_caps_make_writable (caps);
+      s = gst_caps_get_structure (caps, 0);
+
+      g_value_init (&arr, GST_TYPE_LIST);
+      g_value_init (&v, G_TYPE_INT);
+      if (max_channels >= 16) {
+        g_value_set_int (&v, 16);
+        gst_value_list_append_value (&arr, &v);
+      }
+      if (max_channels >= 8) {
+        g_value_set_int (&v, 8);
+        gst_value_list_append_value (&arr, &v);
+      }
+      g_value_set_int (&v, 2);
+      gst_value_list_append_value (&arr, &v);
+
+      gst_structure_set_value (s, "channels", &arr);
+      g_value_unset (&v);
+      g_value_unset (&arr);
+    }
+    GST_OBJECT_UNLOCK (buf);
+  }
+
+  if (filter) {
+    GstCaps *intersection = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
+    gst_caps_unref (caps);
+    caps = intersection;
+  }
+
+  return caps;
+}
+
 static GstAudioRingBuffer *
 gst_decklink_audio_sink_create_ringbuffer (GstAudioBaseSink * absink)
 {