| /* |
| 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 "msAlawenc.h" |
| #include "g711common.h" |
| |
| extern MSCodecInfo ALAWinfo; |
| |
| static MSALAWEncoderClass *ms_ALAWencoder_class=NULL; |
| |
| MSFilter * ms_ALAWencoder_new(void) |
| { |
| MSALAWEncoder *r; |
| |
| r=g_new(MSALAWEncoder,1); |
| ms_ALAWencoder_init(r); |
| if (ms_ALAWencoder_class==NULL) |
| { |
| ms_ALAWencoder_class=g_new(MSALAWEncoderClass,1); |
| ms_ALAWencoder_class_init(ms_ALAWencoder_class); |
| } |
| MS_FILTER(r)->klass=MS_FILTER_CLASS(ms_ALAWencoder_class); |
| return(MS_FILTER(r)); |
| } |
| |
| |
| /* FOR INTERNAL USE*/ |
| void ms_ALAWencoder_init(MSALAWEncoder *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=ALAW_ENCODER_RMAXGRAN; /* the filter can be called as soon as there is |
| something to process */ |
| memset(r->f_inputs,0,sizeof(MSFifo*)*MSALAWENCODER_MAX_INPUTS); |
| memset(r->f_outputs,0,sizeof(MSFifo*)*MSALAWENCODER_MAX_INPUTS); |
| |
| } |
| |
| void ms_ALAWencoder_class_init(MSALAWEncoderClass *klass) |
| { |
| ms_filter_class_init(MS_FILTER_CLASS(klass)); |
| ms_filter_class_set_name(MS_FILTER_CLASS(klass),"ALAWEncoder"); |
| MS_FILTER_CLASS(klass)->info=(MSFilterInfo*)&ALAWinfo; |
| MS_FILTER_CLASS(klass)->max_finputs=MSALAWENCODER_MAX_INPUTS; |
| MS_FILTER_CLASS(klass)->max_foutputs=MSALAWENCODER_MAX_INPUTS; |
| MS_FILTER_CLASS(klass)->r_maxgran=ALAW_ENCODER_RMAXGRAN; |
| MS_FILTER_CLASS(klass)->w_maxgran=ALAW_ENCODER_WMAXGRAN; |
| MS_FILTER_CLASS(klass)->destroy=(MSFilterDestroyFunc)ms_ALAWencoder_destroy; |
| MS_FILTER_CLASS(klass)->process=(MSFilterProcessFunc)ms_ALAWencoder_process; |
| } |
| |
| void ms_ALAWencoder_process(MSALAWEncoder *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 sophisticated design of the process function: |
| Here the filter declares that it can be called as soon as there is something |
| to read on the input fifo by setting r_mingran=0. |
| Then it ask for the fifo to get as many data as possible by calling: |
| inlen=ms_fifo_get_read_ptr(fi,0,(void**)&s); |
| This avoid multiple call to the process function to process all data available |
| on the input fifo... but the writing of the process function is a bit |
| more difficult, because althoug ms_fifo_get_read_ptr() returns N bytes, |
| we cannot ask ms_fifo_get_write_ptr to return N bytes if |
| N>MS_FILTER_CLASS(klass)->w_maxgran. This is forbidden by the MSFifo |
| mechanism. |
| This is an open issue. |
| For the moment what is done here is that ms_fifo_get_write_ptr() is called |
| several time with its maximum granularity in order to try to write the output. |
| ... |
| One solution: |
| -create a new function ms_fifo_get_rw_ptr(fifo1,p1, fifo2,p2) to |
| return the number of bytes able to being processed according to the input |
| and output fifo, and their respective data pointers |
| */ |
| |
| |
| fi=r->f_inputs[0]; |
| fo=r->f_outputs[0]; |
| |
| inlen=ms_fifo_get_read_ptr(fi,ALAW_ENCODER_RMAXGRAN,(void**)&s); |
| if (s==NULL) return; |
| outlen=ms_fifo_get_write_ptr(fo,ALAW_ENCODER_WMAXGRAN,(void**)&d); |
| if (d!=NULL) |
| { |
| for(i=0;i<ALAW_ENCODER_WMAXGRAN;i++) |
| { |
| d[i]=s16_to_alaw( *((gint16*)s) ); |
| s+=2; |
| } |
| } |
| else g_warning("MSALAWDecoder: Discarding samples !!"); |
| |
| } |
| |
| |
| |
| void ms_ALAWencoder_destroy( MSALAWEncoder *obj) |
| { |
| g_free(obj); |
| } |