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/*
Copyright (C) (2004) (Cort Stratton) <cort at cortstratton dot org>
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef BASEENCODER_H
#define BASEENCODER_H
#include "avilib.h"
#include "revel.h"
#include <string>
class Revel_BaseEncoder
{
public:
Revel_BaseEncoder(void);
virtual ~Revel_BaseEncoder(void) =0;
/**
* Initialize for a new encoding session.
* @param filename The output movie will be written to this file.
* @param params General information about the movie and the encoding
* process.
* @return REVEL_ERR_NONE if no error, an error code otherwise.
*/
virtual Revel_Error EncodeStart(const std::string& filename,
const Revel_Params& params);
/**
* Encode a new frame and append it to the video stream.
* @param frame The video frame to encode.
* @param frameSize If non-NULL, the size of the encoded output frame (in
* bytes) will be stored here.
* @return REVEL_ERR_NONE if no error, an error code otherwise.
*/
virtual Revel_Error EncodeFrame(const Revel_VideoFrame& frame,
int *frameSize = NULL);
/**
* Appends a chunk of audio data to the existing audio stream.
* @param sampleBuffer The array of sample data.
* @param numBytes The size of sampleBuffer (in bytes).
* @param numTotalBytes If non-NULL, the total number of bytes of audio
* encoded so far will be stored here.
* @return REVEL_ERR_NONE if no error, an error code otherwise.
*/
virtual Revel_Error EncodeAudio(const void *sampleBuffer,
const int numBytes, int *numTotalBytes = NULL);
/**
* Finalize the encoding process. This function MUST be called after all
* frames have been written, or else the output movie will be unviewable!
* @param totalSize If non-NULL, the total size of the output movie (in
* bytes) will be stored here.
* @return REVEL_ERR_NONE if no error, an error code otherwise.
*/
virtual Revel_Error EncodeEnd(int *totalSize = NULL);
protected:
virtual void Reset(void); /**< Resets the encoder to its initial state. */
char *m_frameBuffer; /**< Buffer containing one frame's worth of encoded data. */
unsigned int m_totalOutBytes; /**< Running count of how many bytes have been written to m_outFile. */
Revel_Params m_params; /**< General output movie parameters. */
std::string m_outFilename; /**< Filename of output movie. */
avi_t *m_outFile; /**< Output movie object. */
bool m_isEncoding; /**< True while encoding is in progress (i.e. between calls to EncodeStart() and EncodeEnd() */
private:
// operator= and copy constructor are disallowed for this class.
Revel_BaseEncoder& operator=(const Revel_BaseEncoder& rhs) { return *this; }
Revel_BaseEncoder(const Revel_BaseEncoder& rhs) {}
};
#endif // BASEENCODER_H
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