diff options
Diffstat (limited to 'kopete/protocols/jabber/jingle/libjingle/talk/third_party/mediastreamer/msMUlawdec.c')
| -rw-r--r-- | kopete/protocols/jabber/jingle/libjingle/talk/third_party/mediastreamer/msMUlawdec.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/kopete/protocols/jabber/jingle/libjingle/talk/third_party/mediastreamer/msMUlawdec.c b/kopete/protocols/jabber/jingle/libjingle/talk/third_party/mediastreamer/msMUlawdec.c new file mode 100644 index 00000000..500f2389 --- /dev/null +++ b/kopete/protocols/jabber/jingle/libjingle/talk/third_party/mediastreamer/msMUlawdec.c @@ -0,0 +1,130 @@ + /* + 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); +} |