media_sink.h

MPEG-4编解码的实现(包括MPEG4视音频编解码)

/*
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (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.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is MPEG4IP.
 * 
 * The Initial Developer of the Original Code is Cisco Systems Inc.
 * Portions created by Cisco Systems Inc. are
 * Copyright (C) Cisco Systems Inc. 2000-2002.  All Rights Reserved.
 * 
 * Contributor(s): 
 *		Dave Mackie		[e-mail]
 *		Bill May 		[e-mail]
 */

#ifndef __MEDIA_SINK_H__
#define __MEDIA_SINK_H__

#include "media_node.h"

class CMediaSink : public CMediaNode {
public:
	CMediaSink() : CMediaNode() {
		m_sink = false;
		m_pEnqueueMutex = SDL_CreateMutex();
		if (m_pEnqueueMutex == NULL) {
			debug_message("EnqueueFrame CreateMutex error");
		}
	}

	~CMediaSink() {
		SDL_DestroyMutex(m_pEnqueueMutex);
	}

	void EnqueueFrame(CMediaFrame* pFrame) {
		if (pFrame == NULL) {
			debug_message("EnqueueFrame: got NULL frame!?");
			return;
		}
		if (SDL_LockMutex(m_pEnqueueMutex) == -1) {
			debug_message("EnqueueFrame LockMutex error");
			return;
		}

		pFrame->AddReference();
		m_myMsgQueue.send_message(MSG_SINK_FRAME, 
			(unsigned char*)pFrame, 0,
			m_myMsgQueueSemaphore);

		if (SDL_UnlockMutex(m_pEnqueueMutex) == -1) {
			debug_message("EnqueueFrame UnlockMutex error");
		}
	}

protected:
	static const int MSG_SINK = 4096;
	static const int MSG_SINK_FRAME = MSG_SINK + 1;

	bool 		m_sink;
	SDL_mutex*	m_pEnqueueMutex;
};

#endif /* __MEDIA_SINK_H__ */