Add libvlc input

Be careful about sample rate conversion, VLC only wants to use
the ugly resampler on some machines.

1 files changed, 107 insertions, 0 deletions

diff --git a/src/VLCInput.h b/src/VLCInput.h
new file mode 100644
index 0000000..13b0695
--- /dev/null
+++ b/src/VLCInput.h
@@ -0,0 +1,107 @@
+/* ------------------------------------------------------------------
+ * Copyright (C) 2015 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.
+ * -------------------------------------------------------------------
+ */
+
+#ifndef __VLC_INPUT_H_
+#define __VLC_INPUT_H_
+
+#include "config.h"
+
+#if HAVE_VLC
+
+#include <cstdio>
+#include <string>
+#include <vector>
+#include <deque>
+
+#include <vlc/vlc.h>
+#include <boost/thread/thread.hpp>
+
+#include "SampleQueue.h"
+
+// 16 bits per sample is fine for now
+#define BYTES_PER_SAMPLE 2
+
+class VLCInput
+{
+    public:
+        VLCInput(const std::string& uri,
+                 int rate,
+                 unsigned verbosity) :
+            m_uri(uri),
+            m_verbosity(verbosity),
+            m_channels(2),
+            m_rate(rate),
+            m_vlc(NULL) { }
+
+        ~VLCInput() {
+            if (m_mp) {
+                /* Stop playing */
+                libvlc_media_player_stop(m_mp);
+
+                /* Free the media_player */
+                libvlc_media_player_release(m_mp);
+            }
+
+            if (m_vlc) {
+                libvlc_release(m_vlc);
+                m_vlc = NULL;
+            }
+        }
+
+        /* Prepare the audio input */
+        int prepare();
+
+        ssize_t read(uint8_t* buf, size_t length);
+
+
+        // Callbacks for VLC
+        void preRender(
+                uint8_t** pp_pcm_buffer,
+                size_t size);
+
+        void postRender(
+                uint8_t* p_pcm_buffer,
+                size_t size);
+
+        int getRate() { return m_rate; }
+
+    protected:
+        ssize_t m_read(uint8_t* buf, size_t length);
+
+        std::vector<uint8_t> m_current_buf;
+
+        boost::mutex m_queue_mutex;
+        std::deque<uint8_t> m_queue;
+
+        std::string m_uri;
+        unsigned m_verbosity;
+        unsigned m_channels;
+        int m_rate;
+
+        // VLC pointers
+        libvlc_instance_t     *m_vlc;
+        libvlc_media_player_t *m_mp;
+
+    private:
+        VLCInput(const VLCInput& other) {}
+};
+
+#endif // HAVE_VLC
+
+#endif
+