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071e720f87
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3009 d0543943-73ff-0310-b7d9-9358b9ac24b2
251 lines
6.9 KiB
C
251 lines
6.9 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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* Brian K. West <brian.west@mac.com>
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*
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* The amr codec itself is not distributed with this module.
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*
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* mod_amr.c -- GSM-AMR Codec Module
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*
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*/
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#include "switch.h"
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#include "amr-nb/amr-nb.h"
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/*
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* Check section 8.1 of rfc3267 for possible sdp options.
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*
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* SDP Example
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*
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* a=fmtp:97 mode-set=0,2,5,7; mode-change-period=2; mode-change-neighbor=1
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*
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* Class A total speech
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* Index Mode bits bits
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* ----------------------------------------
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* 0 AMR 4.75 42 95
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* 1 AMR 5.15 49 103
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* 2 AMR 5.9 55 118
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* 3 AMR 6.7 58 134
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* 4 AMR 7.4 61 148
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* 5 AMR 7.95 75 159
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* 6 AMR 10.2 65 204
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* 7 AMR 12.2 81 244
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* 8 AMR SID 39 39
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*
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* Table 1. The number of class A bits for the AMR codec.
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*
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*/
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static const char modname[] = "mod_amr";
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struct amr_context {
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void *encoder_state;
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void *decoder_state;
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int enc_mode;
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};
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enum
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{
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GENERIC_PARAMETER_AMR_MAXAL_SDUFRAMES = 0,
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GENERIC_PARAMETER_AMR_BITRATE,
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GENERIC_PARAMETER_AMR_GSMAMRCOMFORTNOISE,
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GENERIC_PARAMETER_AMR_GSMEFRCOMFORTNOISE,
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GENERIC_PARAMETER_AMR_IS_641COMFORTNOISE,
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GENERIC_PARAMETER_AMR_PDCEFRCOMFORTNOISE
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};
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enum
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{
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AMR_BITRATE_475 = 0,
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AMR_BITRATE_515,
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AMR_BITRATE_590,
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AMR_BITRATE_670,
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AMR_BITRATE_740,
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AMR_BITRATE_795,
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AMR_BITRATE_1020,
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AMR_BITRATE_1220
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};
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#define AMR_Mode 7
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static switch_status_t switch_amr_init(switch_codec_t *codec, switch_codec_flag_t flags,
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const switch_codec_settings_t *codec_settings)
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{
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struct amr_context *context = NULL;
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int encoding, decoding;
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int x, argc;
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char *argv[10];
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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) || (!(context = switch_core_alloc(codec->memory_pool, sizeof(struct amr_context))))) {
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return SWITCH_STATUS_FALSE;
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} else {
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if (codec->fmtp_in) {
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argc = switch_separate_string(codec->fmtp_in, ';', argv, (sizeof(argv) / sizeof(argv[0])));
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for(x = 0; x < argc; x++) {
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char *data = argv[x];
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char *arg;
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while(*data && *data == ' ') {
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data++;
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}
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if ((arg = strchr(data, '='))) {
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*arg++ = '\0';
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printf("Codec arg %d [%s]=[%s]\n", x, data, arg);
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}
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}
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}
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codec->fmtp_out = "octet-align=0; mode-set=7";
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context->enc_mode = AMR_Mode; /* start in mode 7 */
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context->encoder_state = NULL;
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context->decoder_state = NULL;
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if (encoding) {
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context->encoder_state = Encoder_Interface_init(1);
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}
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if (decoding) {
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context->decoder_state = Decoder_Interface_init();
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}
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codec->private_info = context;
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return SWITCH_STATUS_SUCCESS;
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}
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}
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static switch_status_t switch_amr_destroy(switch_codec_t *codec)
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{
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struct amr_context *context = codec->private_info;
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if (context->encoder_state) {
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Encoder_Interface_exit(context->encoder_state);
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}
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if (context->decoder_state) {
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Decoder_Interface_exit(context->decoder_state);
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}
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codec->private_info = NULL;
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return SWITCH_STATUS_SUCCESS;
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}
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static switch_status_t switch_amr_encode(switch_codec_t *codec,
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switch_codec_t *other_codec,
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void *decoded_data,
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uint32_t decoded_data_len,
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uint32_t decoded_rate,
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void *encoded_data,
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uint32_t *encoded_data_len,
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uint32_t *encoded_rate,
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unsigned int *flag)
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{
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struct amr_context *context = codec->private_info;
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if (!context) {
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return SWITCH_STATUS_FALSE;
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}
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*encoded_data_len = Encoder_Interface_Encode( context->encoder_state, context->enc_mode, (int16_t *)decoded_data, (int8_t *) encoded_data, 0);
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return SWITCH_STATUS_SUCCESS;
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}
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static switch_status_t switch_amr_decode(switch_codec_t *codec,
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switch_codec_t *other_codec,
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void *encoded_data,
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uint32_t encoded_data_len,
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uint32_t encoded_rate,
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void *decoded_data,
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uint32_t *decoded_data_len,
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uint32_t *decoded_rate,
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unsigned int *flag)
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{
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struct amr_context *context = codec->private_info;
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if (!context) {
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return SWITCH_STATUS_FALSE;
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}
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Decoder_Interface_Decode( context->decoder_state, (void *)encoded_data, (void *)decoded_data, 0 );
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*decoded_data_len = codec->implementation->bytes_per_frame;
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//printf("D %d/%d\n", encoded_data_len, *decoded_data_len);
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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_t amr_implementation = {
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/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
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/*.ianacode */ 96,
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/*.iananame */ "AMR",
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/*.fmtp */ "octet-align=0",
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/*.samples_per_second */ 8000,
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/*.bits_per_second */ 0,
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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 */ 0,
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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_amr_init,
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/*.encode */ switch_amr_encode,
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/*.decode */ switch_amr_decode,
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/*.destroy */ switch_amr_destroy,
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};
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static const switch_codec_interface_t amr_codec_interface = {
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/*.interface_name */ "GSM-AMR",
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/*.implementations */ &amr_implementation,
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};
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static switch_loadable_module_interface_t amr_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 */ &amr_codec_interface,
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/*.application_interface */ NULL
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};
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SWITCH_MOD_DECLARE(switch_status_t) switch_module_load(const switch_loadable_module_interface_t **module_interface,
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char *filename)
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{
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/* connect my internal structure to the blank pointer passed to me */
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*module_interface = &amr_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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