321 lines
8.5 KiB
C
321 lines
8.5 KiB
C
/*
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* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
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* Copyright (C) 2005/2006, Anthony Minessale II <anthmct@yahoo.com>
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*
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* Version: MPL 1.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
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*
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* The Initial Developer of the Original Code is
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* Anthony Minessale II <anthmct@yahoo.com>
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* Portions created by the Initial Developer are Copyright (C)
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Anthony Minessale II <anthmct@yahoo.com>
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*
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*
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* mod_g711codec.c -- G711 Ulaw/Alaw Codec Module
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*
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*/
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#include <switch.h>
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#include "g711.h"
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static const char modname[] = "mod_g711codec";
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static switch_status switch_g711u_init(switch_codec *codec, switch_codec_flag flags, const struct switch_codec_settings *codec_settings)
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{
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int encoding, decoding;
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encoding = (flags & SWITCH_CODEC_FLAG_ENCODE);
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decoding = (flags & SWITCH_CODEC_FLAG_DECODE);
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if (!(encoding || decoding)) {
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return SWITCH_STATUS_FALSE;
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} else {
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return SWITCH_STATUS_SUCCESS;
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}
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}
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static switch_status switch_g711u_encode(switch_codec *codec,
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switch_codec *other_codec,
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void *decoded_data,
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size_t decoded_data_len,
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int decoded_rate,
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void *encoded_data,
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size_t *encoded_data_len,
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int *encoded_rate,
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unsigned int *flag)
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{
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short *dbuf;
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unsigned char *ebuf;
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size_t i;
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dbuf = decoded_data;
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ebuf = encoded_data;
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for (i = 0; i < decoded_data_len / sizeof(short); i++) {
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ebuf[i] = linear2ulaw(dbuf[i]);
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}
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*encoded_data_len = i;
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return SWITCH_STATUS_SUCCESS;
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}
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static switch_status switch_g711u_decode(switch_codec *codec,
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switch_codec *other_codec,
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void *encoded_data,
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size_t encoded_data_len,
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int encoded_rate,
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void *decoded_data,
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size_t *decoded_data_len,
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int *decoded_rate,
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unsigned int *flag)
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{
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short *dbuf;
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unsigned char *ebuf;
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size_t i;
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dbuf = decoded_data;
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ebuf = encoded_data;
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if (*flag & SWITCH_CODEC_FLAG_SILENCE) {
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memset(dbuf, 0, codec->implementation->bytes_per_frame);
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*decoded_data_len = codec->implementation->bytes_per_frame;
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} else {
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for (i = 0; i < encoded_data_len; i++) {
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dbuf[i] = ulaw2linear(ebuf[i]);
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}
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*decoded_data_len = i * 2;
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}
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return SWITCH_STATUS_SUCCESS;
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}
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static switch_status switch_g711u_destroy(switch_codec *codec)
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{
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return SWITCH_STATUS_SUCCESS;
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}
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static switch_status switch_g711a_init(switch_codec *codec, switch_codec_flag flags, const struct switch_codec_settings *codec_settings)
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{
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int encoding, decoding;
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encoding = (flags & SWITCH_CODEC_FLAG_ENCODE);
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decoding = (flags & SWITCH_CODEC_FLAG_DECODE);
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if (!(encoding || decoding)) {
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return SWITCH_STATUS_FALSE;
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} else {
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return SWITCH_STATUS_SUCCESS;
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}
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}
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static switch_status switch_g711a_encode(switch_codec *codec,
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switch_codec *other_codec,
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void *decoded_data,
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size_t decoded_data_len,
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int decoded_rate,
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void *encoded_data,
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size_t *encoded_data_len,
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int *encoded_rate,
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unsigned int *flag)
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{
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short *dbuf;
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unsigned char *ebuf;
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size_t i;
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dbuf = decoded_data;
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ebuf = encoded_data;
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for (i = 0; i < decoded_data_len / sizeof(short); i++) {
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ebuf[i] = linear2alaw(dbuf[i]);
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}
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*encoded_data_len = i;
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return SWITCH_STATUS_SUCCESS;
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}
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static switch_status switch_g711a_decode(switch_codec *codec,
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switch_codec *other_codec,
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void *encoded_data,
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size_t encoded_data_len,
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int encoded_rate,
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void *decoded_data,
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size_t *decoded_data_len,
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int *decoded_rate,
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unsigned int *flag)
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{
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short *dbuf;
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unsigned char *ebuf;
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size_t i;
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dbuf = decoded_data;
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ebuf = encoded_data;
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if (*flag & SWITCH_CODEC_FLAG_SILENCE) {
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memset(dbuf, 0, codec->implementation->bytes_per_frame);
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*decoded_data_len = codec->implementation->bytes_per_frame;
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} else {
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for (i = 0; i < encoded_data_len; i++) {
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dbuf[i] = alaw2linear(ebuf[i]);
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}
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*decoded_data_len = i * 2;
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}
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return SWITCH_STATUS_SUCCESS;
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}
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static switch_status switch_g711a_destroy(switch_codec *codec)
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{
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return SWITCH_STATUS_SUCCESS;
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}
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/* Registration */
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static const switch_codec_implementation g711u_8k_60ms_implementation = {
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/*.samples_per_second*/ 8000,
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/*.bits_per_second*/ 19200,
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/*.microseconds_per_frame*/ 60000,
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/*.samples_per_frame*/ 480,
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/*.bytes_per_frame*/ 960,
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/*.encoded_bytes_per_frame*/ 480,
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/*.number_of_channels*/ 1,
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/*.pref_frames_per_packet*/ 1,
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/*.max_frames_per_packet*/ 1,
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/*.init*/ switch_g711u_init,
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/*.encode*/ switch_g711u_encode,
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/*.decode*/ switch_g711u_decode,
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/*.destroy*/ switch_g711u_destroy
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};
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static const switch_codec_implementation g711u_8k_30ms_implementation = {
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/*.samples_per_second*/ 8000,
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/*.bits_per_second*/ 96000,
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/*.microseconds_per_frame*/ 30000,
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/*.samples_per_frame*/ 240,
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/*.bytes_per_frame*/ 480,
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/*.encoded_bytes_per_frame*/ 240,
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/*.number_of_channels*/ 1,
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/*.pref_frames_per_packet*/ 1,
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/*.max_frames_per_packet*/ 1,
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/*.init*/ switch_g711u_init,
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/*.encode*/ switch_g711u_encode,
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/*.decode*/ switch_g711u_decode,
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/*.destroy*/ switch_g711u_destroy,
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/*.next*/ &g711u_8k_60ms_implementation
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};
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static const switch_codec_implementation g711u_16k_implementation = {
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/*.samples_per_second*/ 16000,
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/*.bits_per_second*/ 128000,
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/*.microseconds_per_frame*/ 20000,
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/*.samples_per_frame*/ 320,
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/*.bytes_per_frame*/ 640,
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/*.encoded_bytes_per_frame*/ 320,
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/*.number_of_channels*/ 1,
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/*.pref_frames_per_packet*/ 1,
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/*.max_frames_per_packet*/ 1,
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/*.init*/ switch_g711u_init,
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/*.encode*/ switch_g711u_encode,
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/*.decode*/ switch_g711u_decode,
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/*.destroy*/ switch_g711u_destroy,
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};
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static const switch_codec_implementation g711u_8k_implementation = {
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/*.samples_per_second*/ 8000,
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/*.bits_per_second*/ 64000,
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/*.microseconds_per_frame*/ 20000,
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/*.samples_per_frame*/ 160,
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/*.bytes_per_frame*/ 320,
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/*.encoded_bytes_per_frame*/ 160,
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/*.number_of_channels*/ 1,
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/*.pref_frames_per_packet*/ 1,
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/*.max_frames_per_packet*/ 1,
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/*.init*/ switch_g711u_init,
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/*.encode*/ switch_g711u_encode,
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/*.decode*/ switch_g711u_decode,
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/*.destroy*/ switch_g711u_destroy,
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/*.next*/ &g711u_16k_implementation
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};
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static const switch_codec_implementation g711a_8k_implementation = {
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/*.samples_per_second*/ 8000,
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/*.bits_per_second*/ 64000,
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/*.microseconds_per_frame*/ 20000,
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/*.samples_per_frame*/ 160,
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/*.bytes_per_frame*/ 320,
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/*.encoded_bytes_per_frame*/ 160,
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/*.number_of_channels*/ 1,
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/*.pref_frames_per_packet*/ 1,
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/*.max_frames_per_packet*/ 1,
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/*.init*/ switch_g711a_init,
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/*.encode*/ switch_g711a_encode,
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/*.decode*/ switch_g711a_decode,
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/*.destroy*/ switch_g711a_destroy
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};
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static const switch_codec_interface g711a_codec_interface = {
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/*.interface_name*/ "g711 alaw",
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/*.codec_type*/ SWITCH_CODEC_TYPE_AUDIO,
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/*.ianacode*/ 8,
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/*.iananame*/ "PCMA",
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/*.implementations*/ &g711a_8k_implementation
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};
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static const switch_codec_interface g711u_codec_interface = {
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/*.interface_name*/ "g711 ulaw",
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/*.codec_type*/ SWITCH_CODEC_TYPE_AUDIO,
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/*.ianacode*/ 0,
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/*.iananame*/ "PCMU",
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/*.implementations*/ &g711u_8k_implementation,
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/*.next*/ &g711a_codec_interface
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};
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static switch_loadable_module_interface g711_module_interface = {
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/*.module_name*/ modname,
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/*.endpoint_interface*/ NULL,
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/*.timer_interface*/ NULL,
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/*.dialplan_interface*/ NULL,
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/*.codec_interface*/ &g711u_codec_interface,
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/*.application_interface*/ NULL
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};
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SWITCH_MOD_DECLARE(switch_status) switch_module_load(const switch_loadable_module_interface **interface, char *filename) {
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/* connect my internal structure to the blank pointer passed to me */
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*interface = &g711_module_interface;
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/* indicate that the module should continue to be loaded */
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return SWITCH_STATUS_SUCCESS;
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}
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