OStreamAudioEncoder.hh

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/*
 *  Copyright (C) Massimo Cora' 2006 <maxcvs@email.it>
 *
 *  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 Library 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 _OSTREAMAUDIOENCODER_H_
#define _OSTREAMAUDIOENCODER_H_


#include <ffmpeg/avcodec.h>
#include <ffmpeg/avformat.h>

#include "OStreamConfig.hh"

#define MAX_AUDIO_PACKET_SIZE           (128 * 1024)

class OStreamAudioEncoder
{
public:
        OStreamAudioEncoder( unsigned int io_buf_size, ostream_encoding_type encoding_type, 
                                                int num_channels = 2 );
        virtual ~OStreamAudioEncoder();

        const unsigned char* encode_audio_frame( unsigned char* in_pcm_buffer, int in_pcm_buffer_size, 
                                                                                        int *out_size );

private:        // functions

        bool encoder_initialize ();
        
        AVStream* create_audio_stream( AVFormatContext *io_fmt_context, int codec_id );
        
        bool open_codec( AVStream *stream );

        bool init_pcm_buffer( int size );
        
        void free_pcm_buffer ();
        
        int read_pcm_buffer( unsigned char *buf, int buf_size );
        
        void write_pcm_buffer( const unsigned char *buf, int buf_size );
        
private:        // data
        bool _initialized;

        AVFormatContext *_out_fmt_context;
        
        AVStream *_audio_stream;
        
        AVOutputFormat *_out_fmt;

        unsigned char *_pcm_internal_buffer;
        
    unsigned char *_pcm_read_ptr, *_pcm_write_ptr, *_pcm_end_ptr;
        
        unsigned char* _internal_buffer;
        
        int _internal_buffer_size;
        
        int _encoding_type;
        
        int _frame_size;
        
        int _encoded_frame_size;
        
        unsigned char *_ready_to_encode_frame;
        
        int _num_channels;
};




#endif /* _OSTREAMAUDIOENCODER_H_ */

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