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106 lines
3.5 KiB
106 lines
3.5 KiB
/*
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bcg729_dec.c
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Copyright (C) 2011 Belledonne Communications, Grenoble, France
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Author : Jehan Monnier
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; 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 "mediastreamer2/mscodecutils.h"
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#include "mediastreamer2/msfilter.h"
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#include "mediastreamer2/msticker.h"
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#include "bcg729/decoder.h"
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/* signal and bitstream frame size in byte */
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#define SIGNAL_FRAME_SIZE 160
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#define BITSTREAM_FRAME_SIZE 10
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/* decoder struct: context for decoder channel and concealment */
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struct bcg729Decoder_struct {
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bcg729DecoderChannelContextStruct *decoderChannelContext;
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MSConcealerContext *concealer;
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};
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static void filter_init(MSFilter *f){
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f->data = ms_new0(struct bcg729Decoder_struct,1);
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}
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static void filter_preprocess(MSFilter *f){
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struct bcg729Decoder_struct* obj= (struct bcg729Decoder_struct*) f->data;
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obj->decoderChannelContext = initBcg729DecoderChannel(); /* initialize bcg729 decoder, return channel context */
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obj->concealer = ms_concealer_context_new(UINT32_MAX);
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}
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static void filter_process(MSFilter *f){
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struct bcg729Decoder_struct* obj= (struct bcg729Decoder_struct*) f->data;
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mblk_t *inputMessage, *outputMessage;
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while((inputMessage=ms_queue_get(f->inputs[0]))) {
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while(inputMessage->b_rptr<inputMessage->b_wptr) {
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outputMessage = allocb(SIGNAL_FRAME_SIZE,0);
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bcg729Decoder(obj->decoderChannelContext, inputMessage->b_rptr, 0, (int16_t *)(outputMessage->b_wptr));
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outputMessage->b_wptr+=SIGNAL_FRAME_SIZE;
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inputMessage->b_rptr+=BITSTREAM_FRAME_SIZE;
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ms_queue_put(f->outputs[0],outputMessage);
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ms_concealer_inc_sample_time(obj->concealer,f->ticker->time,10, 1);
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}
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freemsg(inputMessage);
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}
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if (ms_concealer_context_is_concealement_required(obj->concealer, f->ticker->time)) {
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outputMessage = allocb(SIGNAL_FRAME_SIZE,0);
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bcg729Decoder(obj->decoderChannelContext, NULL, 1, (int16_t *)(outputMessage->b_wptr));
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outputMessage->b_wptr+=SIGNAL_FRAME_SIZE;
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ms_queue_put(f->outputs[0],outputMessage);
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ms_concealer_inc_sample_time(obj->concealer,f->ticker->time,10, 0);
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}
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}
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static void filter_postprocess(MSFilter *f){
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struct bcg729Decoder_struct* obj= (struct bcg729Decoder_struct*) f->data;
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ms_concealer_context_destroy(obj->concealer);
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closeBcg729DecoderChannel(obj->decoderChannelContext);
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}
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static void filter_uninit(MSFilter *f){
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ms_free(f->data);
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}
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/*filter specific method*/
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static MSFilterMethod filter_methods[]={
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{ 0, NULL}
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};
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MSFilterDesc ms_bcg729_dec_desc={
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.id=MS_FILTER_PLUGIN_ID, /* from Allfilters.h*/
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.name="MSBCG729Dec",
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.text="G729 decoder filter.",
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.category=MS_FILTER_DECODER,
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.enc_fmt="G729",
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.ninputs=1, /*number of inputs*/
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.noutputs=1, /*number of outputs*/
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.init=filter_init,
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.preprocess=filter_preprocess,
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.process=filter_process,
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.postprocess=filter_postprocess,
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.uninit=filter_uninit,
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.methods=filter_methods,
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.flags=MS_FILTER_IS_PUMP
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};
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MS_FILTER_DESC_EXPORT(ms_bcg729_dec_desc)
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