initial checkin

Check in contents of upstream 1.4.2 tarball, exclude generated files.

1 files changed, 128 insertions, 0 deletions

diff --git a/src/audio/media_buffer.cpp b/src/audio/media_buffer.cpp
new file mode 100644
index 0000000..cc62605
--- /dev/null
+++ b/src/audio/media_buffer.cpp
@@ -0,0 +1,128 @@
+/*
+    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
+*/
+
+#include "media_buffer.h"
+#include <cstring>
+#include "audits/memman.h"
+
+////////////
+// PUBLIC
+////////////
+
+t_media_buffer::t_media_buffer(int size) {
+	buf_size = size;
+	empty = true;
+	buffer = new unsigned char[size];
+	MEMMAN_NEW_ARRAY(buffer);
+	pos_start = 0;
+	pos_end = 0;
+}
+
+t_media_buffer::~t_media_buffer() {
+	MEMMAN_DELETE_ARRAY(buffer);
+	delete [] buffer;
+}
+
+void t_media_buffer::add(unsigned char *data, int len) {
+	int data_start, data_end;
+
+	mtx.lock();
+
+	// The amount of data should fit in the buffer.
+	if (len > buf_size) {
+		mtx.unlock();
+		return;
+	}
+
+	int current_size_content = size_content();
+	if (empty) {
+		data_start = 0;
+		data_end = len - 1;
+		pos_start = 0;
+		empty = false;
+	} else {
+		data_start = (pos_end + 1) % buf_size;
+		data_end = (data_start + len - 1) % buf_size;
+	}
+
+	// Copy the data into the buffer
+	if (data_end >= data_start) {
+		memcpy(buffer + data_start, data, len);
+	} else {
+		// The data wraps around the end of the buffer
+		memcpy(buffer + data_start, data, buf_size - data_start);
+		memcpy(buffer, data + buf_size - data_start, data_end + 1);
+	}
+
+	// Check if the new data wrapped over the start of the old data.
+	// If so, then advance the start of the old data behind the end of the new
+	// data as new data has erased the oldest data.
+	if (buf_size - current_size_content < len) {
+		pos_start =  (data_end + 1) % buf_size;
+	}
+
+	pos_end = data_end;
+
+	mtx.unlock();
+}
+
+bool t_media_buffer::get(unsigned char *data, int len) {
+	mtx.lock();
+
+	if (len > size_content()) {
+		mtx.unlock();
+		return false;
+	}
+
+	// Retrieve the data from the buffer
+	if (pos_start + len <= buf_size) {
+		memcpy(data, buffer + pos_start, len);
+	} else {
+		// The data to be retrieved wraps around the end of
+		// the buffer.
+		memcpy(data, buffer + pos_start, buf_size - pos_start);
+		memcpy(data + buf_size - pos_start, buffer, len - buf_size + pos_start);
+	}
+
+	pos_start = (pos_start + len) % buf_size;
+
+	// Check if buffer is empty
+	if (pos_start == (pos_end + 1) % buf_size) {
+		empty = true;
+	}
+
+	mtx.unlock();
+	return true;
+}
+
+int t_media_buffer::size_content(void) {
+	int len;
+
+	mtx.lock();
+
+	if (empty) {
+		len = 0;
+	} else if (pos_end >= pos_start) {
+		len = pos_end - pos_start + 1;
+	} else {
+		len = pos_end + buf_size - pos_start + 1;
+	}
+
+	mtx.unlock();
+	return len;
+}