Diff: DuerOS-Light-SDK-v1.1.0/duer-os-light/src/media-player/baidu_media_play_buffer.h

Revision:

47:9e361da97763

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DuerOS-Light-SDK-v1.1.0/duer-os-light/src/media-player/baidu_media_play_buffer.h	Tue Jul 18 16:54:45 2017 +0800
@@ -0,0 +1,48 @@
+// Copyright 2017 Baidu Inc. All Rights Reserved.
+// Author: Chen Xihao (chenxihao@baidu.com)
+//
+// Description: Buffer for media player
+
+#ifndef BAIDU_TINYDU_IOT_OS_SRC_MEDIA_PLAYER_BAIDU_MEDIA_PLAY_BUFFER_H
+#define BAIDU_TINYDU_IOT_OS_SRC_MEDIA_PLAYER_BAIDU_MEDIA_PLAY_BUFFER_H
+
+#include "rtos.h"
+
+namespace duer {
+
+// FIFO circle buffer
+class MediaPlayBuffer {
+public:
+    MediaPlayBuffer(void* buffer, size_t size);
+
+    ~MediaPlayBuffer();
+
+    // write buffer until buffer has enough space
+    void write(const void* data, size_t size);
+
+    // read buffer until buffer has enough data
+    void read(void* data, size_t size);
+
+    void clear();
+
+    static const size_t MIN_BUFFER_SIZE = 5 * 1024;
+
+    static const size_t DEFAULT_BUFFER_SIZE = 10 * 1024;
+
+private:
+    MediaPlayBuffer(const MediaPlayBuffer&);
+
+    MediaPlayBuffer& operator=(const MediaPlayBuffer&);
+
+    char* const _buffer;
+    const size_t _BUFFER_SIZE;
+    Mutex _mutex;
+    bool _wait;
+    Semaphore _semaphore;
+    int _start;
+    int _end;
+};
+
+} // namespace duer
+
+#endif // BAIDU_TINYDU_IOT_OS_SRC_MEDIA_PLAYER_BAIDU_MEDIA_PLAY_BUFFER_H