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  • Committer: Bazaar Package Importer
  • Author(s): Samuel Mimram
  • Date: 2006-11-15 10:34:50 UTC
  • mfrom: (1.2.1 upstream) (2.1.8 feisty)
  • Revision ID: james.westby@ubuntu.com-20061115103450-qgafwcks2lkhctlj
http://bugs.debian.org/398307
* New upstream release.
* Enable video support.
* Fix mismatched #endif in mscommon.h, closes: #398307.

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