Add GStreamer input prototype

1 files changed, 89 insertions, 0 deletions

diff --git a/src/GSTInput.h b/src/GSTInput.h
new file mode 100644
index 0000000..07cf62e
--- /dev/null
+++ b/src/GSTInput.h
@@ -0,0 +1,89 @@
+/* ------------------------------------------------------------------
+ * Copyright (C) 2019 Matthias P. Braendli
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ * -------------------------------------------------------------------
+ */
+/*! \file GSTInput.h
+ *
+ * This input uses GStreamer to get audio data.
+ */
+
+#pragma once
+
+#include "config.h"
+
+#if HAVE_GST
+
+#include <string>
+#include <vector>
+#include <cstddef>
+#include <cstdint>
+
+#include <gst/gst.h>
+
+#include "SampleQueue.h"
+#include "common.h"
+#include "InputInterface.h"
+
+extern "C" {
+#include "utils.h"
+}
+
+struct GSTData {
+    GSTData(SampleQueue<uint8_t>& samplequeue);
+
+    GstElement *pipeline = nullptr;
+    GstElement *uridecodebin = nullptr;
+    GstElement *audio_convert = nullptr;
+    GstElement *caps_filter = nullptr;
+    GstElement *app_sink = nullptr;
+
+    GstBus *bus = nullptr;
+    GMainLoop *main_loop = nullptr;
+
+    SampleQueue<uint8_t>& samplequeue;
+};
+
+class GSTInput : public InputInterface
+{
+    public:
+        GSTInput(const std::string& uri,
+                 int rate,
+                 unsigned channels,
+                 SampleQueue<uint8_t>& queue);
+
+        GSTInput(const GSTInput& other) = delete;
+        GSTInput& operator=(const GSTInput& other) = delete;
+        virtual ~GSTInput();
+
+        virtual void prepare() override;
+
+        virtual bool read_source(size_t num_bytes) override;
+
+        int getRate() { return m_rate; }
+
+        virtual bool fault_detected(void) const override { return false; };
+    private:
+        std::string m_uri;
+        unsigned m_channels;
+        int m_rate;
+
+        GSTData m_gst_data;
+
+        SampleQueue<uint8_t>& m_samplequeue;
+};
+
+#endif // HAVE_GST
+