| /* |
| The mediastreamer library aims at providing modular media processing and I/O |
| for linphone, but also for any telephony application. |
| Copyright (C) 2001 Simon MORLAT simon.morlat@linphone.org |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| This library 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| |
| #include <msMUlawdec.h> |
| #include <g711common.h> |
| |
| extern MSFilter * ms_MULAWencoder_new(void); |
| |
| MSCodecInfo MULAWinfo={ |
| { |
| "MULAW codec", |
| 0, |
| MS_FILTER_AUDIO_CODEC, |
| ms_MULAWencoder_new, |
| "This is the classic Mu-law codec. Good quality, but only usable with high speed network connections." |
| }, |
| ms_MULAWencoder_new, |
| ms_MULAWdecoder_new, |
| 320, |
| 160, |
| 64000, |
| 8000, |
| 0, |
| "PCMU", |
| 1, |
| 1 |
| }; |
| |
| static MSMULAWDecoderClass *ms_MULAWdecoder_class=NULL; |
| |
| MSFilter * ms_MULAWdecoder_new(void) |
| { |
| MSMULAWDecoder *r; |
| |
| r=g_new(MSMULAWDecoder,1); |
| ms_MULAWdecoder_init(r); |
| if (ms_MULAWdecoder_class==NULL) |
| { |
| ms_MULAWdecoder_class=g_new(MSMULAWDecoderClass,1); |
| ms_MULAWdecoder_class_init(ms_MULAWdecoder_class); |
| } |
| MS_FILTER(r)->klass=MS_FILTER_CLASS(ms_MULAWdecoder_class); |
| return(MS_FILTER(r)); |
| } |
| |
| |
| /* FOR INTERNAL USE*/ |
| void ms_MULAWdecoder_init(MSMULAWDecoder *r) |
| { |
| ms_filter_init(MS_FILTER(r)); |
| MS_FILTER(r)->infifos=r->f_inputs; |
| MS_FILTER(r)->outfifos=r->f_outputs; |
| MS_FILTER(r)->r_mingran=MULAW_DECODER_RMAXGRAN; |
| memset(r->f_inputs,0,sizeof(MSFifo*)*MSMULAWDECODER_MAX_INPUTS); |
| memset(r->f_outputs,0,sizeof(MSFifo*)*MSMULAWDECODER_MAX_INPUTS); |
| |
| } |
| |
| void ms_MULAWdecoder_class_init(MSMULAWDecoderClass *klass) |
| { |
| ms_filter_class_init(MS_FILTER_CLASS(klass)); |
| ms_filter_class_set_name(MS_FILTER_CLASS(klass),"MULAWDecoder"); |
| MS_FILTER_CLASS(klass)->info=(MSFilterInfo*)&MULAWinfo; |
| MS_FILTER_CLASS(klass)->max_finputs=MSMULAWDECODER_MAX_INPUTS; |
| MS_FILTER_CLASS(klass)->max_foutputs=MSMULAWDECODER_MAX_INPUTS; |
| MS_FILTER_CLASS(klass)->r_maxgran=MULAW_DECODER_RMAXGRAN; |
| MS_FILTER_CLASS(klass)->w_maxgran=MULAW_DECODER_WMAXGRAN; |
| MS_FILTER_CLASS(klass)->destroy=(MSFilterDestroyFunc)ms_MULAWdecoder_destroy; |
| MS_FILTER_CLASS(klass)->process=(MSFilterProcessFunc)ms_MULAWdecoder_process; |
| } |
| |
| void ms_MULAWdecoder_process(MSMULAWDecoder *r) |
| { |
| MSFifo *fi,*fo; |
| int inlen,outlen; |
| gchar *s,*d; |
| int i; |
| /* process output fifos, but there is only one for this class of filter*/ |
| |
| /* this is the simplest process function design: |
| the filter declares a r_mingran of MULAW_DECODER_RMAXGRAN, so the mediastreamer's |
| scheduler will call the process function each time there is MULAW_DECODER_RMAXGRAN |
| bytes to read in the input fifo. If there is more, then it will call it several |
| time in order to the fifo to be completetly processed. |
| This is very simple, but not very efficient because of the multiple call function |
| of MSFilterProcessFunc that may happen. |
| The MSAlawEncoder implements another design; see it. |
| */ |
| |
| fi=r->f_inputs[0]; |
| fo=r->f_outputs[0]; |
| |
| inlen=ms_fifo_get_read_ptr(fi,MULAW_DECODER_RMAXGRAN,(void**)&s); |
| if (s==NULL) g_error("ms_MULAWdecoder_process: internal error."); |
| outlen=ms_fifo_get_write_ptr(fo,MULAW_DECODER_WMAXGRAN,(void**)&d); |
| if (d!=NULL) |
| { |
| for(i=0;i<MULAW_DECODER_RMAXGRAN;i++) |
| { |
| *((gint16*)d)=ulaw_to_s16( (unsigned char) s[i]); |
| d+=2; |
| } |
| } |
| else g_warning("MSMULAWDecoder: Discarding samples !!"); |
| } |
| |
| |
| |
| void ms_MULAWdecoder_destroy( MSMULAWDecoder *obj) |
| { |
| g_free(obj); |
| } |