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/*
Copyright (C) 2005-2009 Michel de Boer <michel@twinklephone.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _MEDIA_BUFFER_H
#define _MEDIA_BUFFER_H
#include "threads/mutex.h"
// A buffer for buffering media streams.
// Used for conference calls to buffer one stream that needs to be
// mixed with the main stream.
class t_media_buffer {
private:
// The buffer. It is used as a ring buffer
unsigned char *buffer;
// Size of the buffer
int buf_size;
// Begin and end position of the buffer content.
// pos_end points to the last byte of content.
int pos_start;
int pos_end;
// Inidicates if buffer is empty
bool empty;
// Mutex to protect operations on the buffer
t_recursive_mutex mtx;
// Prevent this constructor from being used.
t_media_buffer() {};
public:
// Create a media buffer of size size.
t_media_buffer(int size);
~t_media_buffer();
// Add data to buffer. If there is more data than buffer
// space left, then old content will be removed from the
// buffer.
// - data is the data to be added
// - len is the number of bytes to be added
void add(unsigned char *data, int len);
// Get data from the buffer. If there is not enough data
// in the buffer, then no data is retrieved at all.
// False is returned if data cannot be retrieved.
// - data must point to a buffer of at least size len
// - len is the amount of bytes to be retrieved
bool get(unsigned char *data, int len);
// Return the number of bytes contained by the buffer.
int size_content(void);
};
#endif
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