diff options
Diffstat (limited to 'kopete/protocols/jabber/jingle/libjingle/talk/third_party/mediastreamer/msAlawenc.c')
| -rw-r--r-- | kopete/protocols/jabber/jingle/libjingle/talk/third_party/mediastreamer/msAlawenc.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/kopete/protocols/jabber/jingle/libjingle/talk/third_party/mediastreamer/msAlawenc.c b/kopete/protocols/jabber/jingle/libjingle/talk/third_party/mediastreamer/msAlawenc.c new file mode 100644 index 00000000..fd1f9abe --- /dev/null +++ b/kopete/protocols/jabber/jingle/libjingle/talk/third_party/mediastreamer/msAlawenc.c @@ -0,0 +1,124 @@ + /* + 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); +} |