/* * G.722 Plugin codec for OpenH323/OPAL * * Copyright (C) 2008 by Hermon Labs, All Rights Reserved * * The contents of this file are subject to the Mozilla Public License * Version 1.0 (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 Open Phone Abstraction Library. * * The Initial Developer of the Original Code is Eugene Mednikov * * Contributor(s): ______________________________________. * * $Revision: 22390 $ * $Author: rjongbloed $ * $Date: 2009-04-07 04:32:38 +0000 (Tue, 07 Apr 2009) $ */ #ifndef PLUGIN_CODEC_DLL_EXPORTS #include "plugin-config.h" #endif #include #include "VoIPCodecs/inttypes.h" #include "VoIPCodecs/g722.h" /* Due to a spec error, clock rate is 8kHz even though this is 16kHz codec, see RFC3551/4.5.2. So some of these values have to be lied about so that the OPAL system gets it right. */ #define CLOCK_RATE 8000 // Clock rate is not samples/second in this case! #define BITS_PER_SECOND 64000 // raw bits per second #define FRAME_TIME 1000 // Microseconds in a millisecond #define SAMPLES_PER_FRAME 16 // Samples in a millisecond #define BYTES_PER_FRAME 8 // Bytes in a millisecond #define MAX_FRAMES_PER_PACKET 90 // 90 milliseconds, which means RTP packets smaller than 1500 bytes typical LAN maximum #define PREF_FRAMES_PER_PACKET 20 // 20 milliseconds static const char L16Desc[] = "PCM-16-16kHz"; // Cannot use "L16" as usual, force 16kHz PCM static const char g722[] = "G.722-64k"; static const char sdpG722[] = "G722"; #define PAYLOAD_CODE 9 ///////////////////////////////////////////////////////////////////////////// static void * create_encoder(const struct PluginCodec_Definition * codec) { return g722_encode_init(NULL, BITS_PER_SECOND, 0); } static void destroy_encoder(const struct PluginCodec_Definition * codec, void * context) { g722_encode_release(context); } static int encode(const struct PluginCodec_Definition * codec, void * context, const void * from, unsigned * fromLen, void * to, unsigned * toLen, unsigned int * flag) { g722_encode_state_t * state = context; if (*toLen < *fromLen / 4) return 0; // Destination buffer not big enough *toLen = g722_encode(state, to, from, *fromLen / 2); return 1; } ///////////////////////////////////////////////////////////////////////////// static void * create_decoder(const struct PluginCodec_Definition * codec) { return g722_decode_init(NULL, BITS_PER_SECOND, 0); } static void destroy_decoder(const struct PluginCodec_Definition * codec, void * context) { g722_decode_release(context); } static int decode(const struct PluginCodec_Definition * codec, void * _context, const void * from, unsigned * fromLen, void * to, unsigned * toLen, unsigned int * flag) { g722_decode_state_t * state = _context; if (*toLen < *fromLen * 4) return 0; // Destination buffer not big enough *toLen = g722_decode(state, to, from, *fromLen) * 2; return 1; } ///////////////////////////////////////////////////////////////////////////// static struct PluginCodec_information licenseInfo = { 1084181196, // timestamp = Mon 10 May 2004 09:26:36 AM UTC "Eugene Mednikov", // source code author "1.0", // source code version "em@hermonlabs.com", // source code email "http://www.hermonlabs.com", // source code URL "Copyright (C) 2008 by Hermon Labs, All Rights Reserved", // source code copyright "MPL 1.0", // source code license PluginCodec_License_MPL, // source code license "ITU G.722", // codec description "Steve Underwood", // codec author NULL, // codec version "steveu@coppice.org", // codec email NULL, // codec URL NULL, // codec copyright information NULL, // codec license PluginCodec_License_LGPL // codec license code }; ///////////////////////////////////////////////////////////////////////////// static struct PluginCodec_Definition g722CodecDefn[] = { { // encoder PLUGIN_CODEC_VERSION_WIDEBAND, // codec API version &licenseInfo, // license information PluginCodec_MediaTypeAudio | // audio codec PluginCodec_InputTypeRaw | // raw input data PluginCodec_OutputTypeRaw | // raw output data PluginCodec_RTPTypeExplicit, // specified RTP type g722, // text decription L16Desc, // source format g722, // destination format 0, // user data CLOCK_RATE, // samples per second BITS_PER_SECOND, // raw bits per second FRAME_TIME, // microseconds per frame SAMPLES_PER_FRAME, // samples per frame BYTES_PER_FRAME, // bytes per frame PREF_FRAMES_PER_PACKET, // recommended number of frames per packet MAX_FRAMES_PER_PACKET, // maximum number of frames per packe PAYLOAD_CODE, // IANA RTP payload code sdpG722, // RTP payload name create_encoder, // create codec function destroy_encoder, // destroy codec encode, // encode/decode NULL, // codec controls PluginCodec_H323AudioCodec_g722_64k, // h323CapabilityType NULL // h323CapabilityData }, { // decoder PLUGIN_CODEC_VERSION_WIDEBAND, // codec API version &licenseInfo, // license information PluginCodec_MediaTypeAudio | // audio codec PluginCodec_InputTypeRaw | // raw input data PluginCodec_OutputTypeRaw | // raw output data PluginCodec_RTPTypeExplicit, // specified RTP type g722, // text decription g722, // source format L16Desc, // destination format 0, // user data CLOCK_RATE, // samples per second BITS_PER_SECOND, // raw bits per second FRAME_TIME, // microseconds per frame SAMPLES_PER_FRAME, // samples per frame BYTES_PER_FRAME, // bytes per frame PREF_FRAMES_PER_PACKET, // recommended number of frames per packet MAX_FRAMES_PER_PACKET, // maximum number of frames per packe PAYLOAD_CODE, // IANA RTP payload code sdpG722, // RTP payload name create_decoder, // create codec function destroy_decoder, // destroy codec decode, // encode/decode NULL, // codec controls PluginCodec_H323AudioCodec_g722_64k, // h323CapabilityType NULL // h323CapabilityData } }; PLUGIN_CODEC_IMPLEMENT_ALL(G722, g722CodecDefn, PLUGIN_CODEC_VERSION_WIDEBAND) /////////////////////////////////////////////////////////////////////////////