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https://github.com/signalwire/freeswitch.git
synced 2025-04-03 20:00:26 +00:00
Ok this actually passes the right RTP sizes but no audio. Work in progress
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@2496 d0543943-73ff-0310-b7d9-9358b9ac24b2
This commit is contained in:
Brian West
parent
8da1a310a2
commit
19f860e274
16
src/mod/codecs/mod_lpc10/Makefile
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16
src/mod/codecs/mod_lpc10/Makefile
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LDFLAGS +=-llpc10
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all: depends $(MODNAME).$(DYNAMIC_LIB_EXTEN)
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depends:
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MAKE=$(MAKE) $(BASE)/build/buildlib.sh $(BASE) install codec/lpc10 --prefix=$(PREFIX)
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$(MODNAME).$(DYNAMIC_LIB_EXTEN): $(MODNAME).c ../../../include/switch_bitpack.h
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$(CC) $(CFLAGS) -fPIC -c $(MODNAME).c -o $(MODNAME).o
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$(CC) $(SOLINK) $(MODNAME).o -o $(MODNAME).$(DYNAMIC_LIB_EXTEN) $(LDFLAGS)
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clean:
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rm -fr *.$(DYNAMIC_LIB_EXTEN) *.o *~
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install:
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cp -f $(MODNAME).$(DYNAMIC_LIB_EXTEN) $(PREFIX)/mod
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214
src/mod/codecs/mod_lpc10/mod_lpc10.c
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src/mod/codecs/mod_lpc10/mod_lpc10.c
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/*
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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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* Brian K. West <brian.west@mac.com>
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*
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*
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* mod_lpc10.c -- LPC10 Codec Module
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*
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*/
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#include "switch.h"
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#include "lpc10/lpc10.h"
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enum {
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SamplesPerFrame = 180,
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BitsPerFrame = 54,
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BytesPerFrame = (BitsPerFrame+7)/8,
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BitsPerSecond = 2400
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};
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#define SampleValueScale 32768.0
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#define MaxSampleValue 32767.0
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#define MinSampleValue -32767.0
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static const char modname[] = "mod_lpc10";
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struct lpc10_context {
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struct lpc10_encoder_state encoder_object;
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struct lpc10_decoder_state decoder_object;
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};
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static switch_status_t switch_lpc10_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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uint32_t encoding, decoding;
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struct lpc10_context *context = NULL;
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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 lpc10_context))))) {
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return SWITCH_STATUS_FALSE;
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} else {
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if (encoding) {
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init_lpc10_encoder_state(&context->encoder_object);
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}
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if (decoding) {
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init_lpc10_decoder_state(&context->decoder_object);
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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_lpc10_destroy(switch_codec_t *codec)
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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_lpc10_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 lpc10_context *context = codec->private_info;
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int i;
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INT32 bits[BitsPerFrame];
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real speech[SamplesPerFrame];
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short * sampleBuffer = (short *)encoded_data;
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unsigned char * buffer = (unsigned char *)decoded_data;
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if (!context) {
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return SWITCH_STATUS_FALSE;
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}
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for (i = 0; i < SamplesPerFrame; i++)
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speech[i] = (real)(sampleBuffer[i]/SampleValueScale);
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lpc10_encode(speech, bits, &context->encoder_object);
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memset(encoded_data, 0, BytesPerFrame);
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for (i = 0; i < BitsPerFrame; i++) {
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if (bits[i])
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buffer[i>>3] |= 1 << (i&7);
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}
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*encoded_data_len = BytesPerFrame;
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return SWITCH_STATUS_SUCCESS;
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}
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static switch_status_t switch_lpc10_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 lpc10_context *context = codec->private_info;
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int i;
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INT32 bits[BitsPerFrame];
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real speech[SamplesPerFrame];
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short * sampleBuffer = (short *)decoded_data;
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unsigned char * buffer = (unsigned char *)encoded_data;
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if (!context) {
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return SWITCH_STATUS_FALSE;
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}
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for (i = 0; i < BitsPerFrame; i++)
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bits[i] = (buffer[i>>3]&(1<<(i&7))) != 0;
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lpc10_decode(bits, speech, &context->decoder_object);
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for (i = 0; i < SamplesPerFrame; i++) {
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real sample = (real)(speech[i]*SampleValueScale);
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if (sample < MinSampleValue)
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sample = MinSampleValue;
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else if (sample > MaxSampleValue)
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sample = MaxSampleValue;
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sampleBuffer[i] = (short)sample;
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}
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*decoded_data_len = SamplesPerFrame*2;
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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 lpc10_implementation = {
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/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO,
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/*.ianacode */ 7,
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/*.iananame */ "LPC",
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/*.samples_per_second */ 8000,
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/*.bits_per_second */ 240,
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/*.microseconds_per_frame */ 22500,
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/*.samples_per_frame */ 180,
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/*.bytes_per_frame */ 360,
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/*.encoded_bytes_per_frame */ 7,
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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_lpc10_init,
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/*.encode */ switch_lpc10_encode,
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/*.decode */ switch_lpc10_decode,
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/*.destroy */ switch_lpc10_destroy,
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};
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const switch_codec_interface_t lpc10_codec_interface = {
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/*.interface_name */ "LPC-10 2.4kbps",
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/*.implementations */ &lpc10_implementation,
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};
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static switch_loadable_module_interface_t lpc10_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 */ &lpc10_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 = &lpc10_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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