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celtcodec.cpp

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    celtcodec.cpp 4.32 KiB
    /*
     *  Copyright (C) 2007-2009 Savoir-Faire Linux inc.
     *  Author: Alexandre Savard <alexandre.savard@savoirfairelinux.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 3 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.
     */
    
    #include "audiocodec.h"
    #include <cstdio>
    #include <celt/celt.h>
    
    
    class Celt : public AudioCodec
    {
    
        public:
            Celt (int payload=0)	: AudioCodec (payload, "celt") {
    
                _clockRate = 32000;
                _frameSize = 320;  // fixed frameSize, TODO: support variable size from 64 to 512
                _channel = 1;
                _bitrate = 0;
                _bandwidth = 0;
    
                initCelt();
    
            }
    
            Celt (const Celt&);
            Celt& operator= (const Celt&);
    
            void initCelt() {
                printf ("Celt: Init Celt codec");
    
                int error = 0;
    
                _mode = celt_mode_create (_clockRate, _frameSize, &error);
    
                if(error != CELT_OK) {
                	switch(error) {
                	case CELT_BAD_ARG:
                		printf("Celt: Error: An (or more) invalid argument (e.g. out of range)\n");
                		break;
                	case CELT_INVALID_MODE:
                		printf("Celt: Error: The mode struct passed is invalid\n");
                		break;
                	case CELT_INTERNAL_ERROR:
                		printf("Celt: Error: An internal error was detected\n");
                		break;
                	case CELT_CORRUPTED_DATA:
                		printf("Celt: Error: The data passed (e.g. compressed data to decoder) is corrupted\n");
                		break;
                	case CELT_UNIMPLEMENTED:
                		printf("Celt: Error: Invalid/unsupported request numbe\n");
                		break;
                	case CELT_INVALID_STATE:
                		printf("Celt: Error: An encoder or decoder structure is invalid or already freed\n");
                		break;
                	case CELT_ALLOC_FAIL:
    					printf("Celt: Error: Memory allocation has failed\n");
    					break;
                	default:
    					printf("Celt: Error");
                	}
    
                }
    
                if (_mode == NULL) {
                    printf ("Celt: Error: Failed to create Celt mode");
                }
    
                // bytes_per_packet = 1024;
                // if (bytes_per_packet < 0 || bytes_per_packet > MAX_PACKET)
                // {
                //     printf ("bytes per packet must be between 0 and %d");
                // }
    
                // celt_mode_info(mode, CELT_GET_FRAME_SIZE, &frame_size);
                // celt_mode_info(mode, CELT_GET_NB_CHANNELS, &_channel);
    
                _enc = celt_encoder_create (_mode, _channel, &error);
    
                _dec = celt_decoder_create (_mode, _channel, &error);
    
                celt_encoder_ctl (_enc, CELT_SET_COMPLEXITY (10));
                celt_decoder_ctl(_dec, CELT_SET_COMPLEXITY (10));
    
            }
    
            ~Celt() {
                terminateCelt();
            }
    
            void terminateCelt() {
    
                celt_encoder_destroy (_enc);
                celt_decoder_destroy (_dec);
    
                celt_mode_destroy(_mode);
            }
    
            virtual int codecDecode (short *dst, unsigned char *src, unsigned int size) {
                int err = 0;
                err = celt_decode (_dec, src, size, (celt_int16*) dst);
                return _frameSize * sizeof (celt_int16);
            }
    
            virtual int codecEncode (unsigned char *dst, short *src, unsigned int size) {
                int len = 0;
                len = celt_encode (_enc, (celt_int16*) src, (celt_int16 *) src, dst, 512);
                // returns the number of bytes writen
                return len;
            }
    
        private:
    
            CELTMode *_mode;
    
            CELTEncoder *_enc;
            CELTDecoder *_dec;
    
            celt_int32 _celt_frame_size;
            celt_int32 skip;
    
    };
    
    // the class factories
    extern "C" AudioCodec* create()
    {
        return new Celt (115);
    }
    
    extern "C" void destroy (AudioCodec* a)
    {
        delete a;
    }