audiostream.c 29.4 KB
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/*
mediastreamer2 library - modular sound and video processing and streaming
Copyright (C) 2006  Simon MORLAT (simon.morlat@linphone.org)

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/


#ifdef HAVE_CONFIG_H
#include "mediastreamer-config.h"
#endif

#include "mediastreamer2/mediastream.h"

#include "mediastreamer2/dtmfgen.h"
#include "mediastreamer2/mssndcard.h"
#include "mediastreamer2/msrtp.h"
#include "mediastreamer2/msfileplayer.h"
#include "mediastreamer2/msfilerec.h"
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#include "mediastreamer2/msvolume.h"
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#include "mediastreamer2/msequalizer.h"
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#ifdef INET6
	#include <sys/types.h>
#ifndef WIN32
	#include <sys/socket.h>
	#include <netdb.h>
#endif
#endif

#define MAX_RTP_SIZE	1500
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#include "msprivate.h"
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/* this code is not part of the library itself, it is part of the mediastream program */
void audio_stream_free(AudioStream *stream)
{
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	if (stream->session!=NULL) {
		rtp_session_unregister_event_queue(stream->session,stream->evq);
		rtp_session_destroy(stream->session);
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		if (stream->ortpZrtpContext != NULL) {
			ortp_zrtp_context_destroy(stream->ortpZrtpContext);
			stream->ortpZrtpContext=NULL;
		}
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	}
	if (stream->evq) ortp_ev_queue_destroy(stream->evq);
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	if (stream->rtpsend!=NULL) ms_filter_destroy(stream->rtpsend);
	if (stream->rtprecv!=NULL) ms_filter_destroy(stream->rtprecv);
	if (stream->soundread!=NULL) ms_filter_destroy(stream->soundread);
	if (stream->soundwrite!=NULL) ms_filter_destroy(stream->soundwrite);
	if (stream->encoder!=NULL) ms_filter_destroy(stream->encoder);
	if (stream->decoder!=NULL) ms_filter_destroy(stream->decoder);
	if (stream->dtmfgen!=NULL) ms_filter_destroy(stream->dtmfgen);
	if (stream->ec!=NULL)	ms_filter_destroy(stream->ec);
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	if (stream->volrecv!=NULL) ms_filter_destroy(stream->volrecv);
	if (stream->volsend!=NULL) ms_filter_destroy(stream->volsend);
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	if (stream->equalizer!=NULL) ms_filter_destroy(stream->equalizer);
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	if (stream->ticker!=NULL) ms_ticker_destroy(stream->ticker);
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	if (stream->read_resampler!=NULL) ms_filter_destroy(stream->read_resampler);
	if (stream->write_resampler!=NULL) ms_filter_destroy(stream->write_resampler);
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	if (stream->dtmfgen_rtp!=NULL) ms_filter_destroy(stream->dtmfgen_rtp);
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	if (stream->rc) ms_bitrate_controller_destroy(stream->rc);
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	if (stream->qi) ms_quality_indicator_destroy(stream->qi);
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	ms_free(stream);
}

static int dtmf_tab[16]={'0','1','2','3','4','5','6','7','8','9','*','#','A','B','C','D'};

static void on_dtmf_received(RtpSession *s, int dtmf, void * user_data)
{
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	AudioStream *stream=(AudioStream*)user_data;
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	if (dtmf>15){
		ms_warning("Unsupported telephone-event type.");
		return;
	}
	ms_message("Receiving dtmf %c.",dtmf_tab[dtmf]);
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	if (stream->dtmfgen!=NULL && stream->play_dtmfs){
		ms_filter_call_method(stream->dtmfgen,MS_DTMF_GEN_PUT,&dtmf_tab[dtmf]);
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	}
}

bool_t ms_is_ipv6(const char *remote){
	bool_t ret=FALSE;
#ifdef INET6
	struct addrinfo hints, *res0;
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	int err;
	memset(&hints, 0, sizeof(hints));
	hints.ai_family = PF_UNSPEC;
	hints.ai_socktype = SOCK_DGRAM;
	err = getaddrinfo(remote,"8000", &hints, &res0);
	if (err!=0) {
		ms_warning ("get_local_addr_for: %s", gai_strerror(err));
		return FALSE;
	}
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	ret=(res0->ai_addr->sa_family==AF_INET6);
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	freeaddrinfo(res0);
#endif
	return ret;
}

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static void audio_stream_configure_resampler(MSFilter *resampler,MSFilter *from,MSFilter *to) {
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	int from_rate=0, to_rate=0;
	ms_filter_call_method(from,MS_FILTER_GET_SAMPLE_RATE,&from_rate);
	ms_filter_call_method(to,MS_FILTER_GET_SAMPLE_RATE,&to_rate);
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	ms_filter_call_method(resampler,MS_FILTER_SET_SAMPLE_RATE,&from_rate);
	ms_filter_call_method(resampler,MS_FILTER_SET_OUTPUT_SAMPLE_RATE,&to_rate);
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	ms_message("configuring %s-->%s from rate[%i] to rate [%i]",
	           from->desc->name, to->desc->name, from_rate,to_rate);
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}

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static void disable_checksums(ortp_socket_t sock){
#if defined(DISABLE_CHECKSUMS) && defined(SO_NO_CHECK)
	int option=1;
	if (setsockopt(sock,SOL_SOCKET,SO_NO_CHECK,&option,sizeof(option))==-1){
		ms_warning("Could not disable udp checksum: %s",strerror(errno));
	}
#endif
}

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RtpSession * create_duplex_rtpsession( int locport, bool_t ipv6){
	RtpSession *rtpr;
	rtpr=rtp_session_new(RTP_SESSION_SENDRECV);
	rtp_session_set_recv_buf_size(rtpr,MAX_RTP_SIZE);
	rtp_session_set_scheduling_mode(rtpr,0);
	rtp_session_set_blocking_mode(rtpr,0);
	rtp_session_enable_adaptive_jitter_compensation(rtpr,TRUE);
	rtp_session_set_symmetric_rtp(rtpr,TRUE);
	rtp_session_set_local_addr(rtpr,ipv6 ? "::" : "0.0.0.0",locport);
	rtp_session_signal_connect(rtpr,"timestamp_jump",(RtpCallback)rtp_session_resync,(long)NULL);
	rtp_session_signal_connect(rtpr,"ssrc_changed",(RtpCallback)rtp_session_resync,(long)NULL);
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	rtp_session_set_ssrc_changed_threshold(rtpr,0);
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	rtp_session_set_rtcp_report_interval(rtpr,2500); /*at the beginning of the session send more reports*/
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	disable_checksums(rtp_session_get_rtp_socket(rtpr));
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	return rtpr;
}

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#if defined(_WIN32_WCE)
time_t
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ms_time (time_t *t)
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{
    DWORD timemillis = GetTickCount();
	if (timemillis>0)
	{
		if (t!=NULL)
			*t = timemillis/1000;
	}
	return timemillis/1000;
}
#endif

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static void audio_stream_process_rtcp(AudioStream *stream, mblk_t *m){
	do{
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		const report_block_t *rb=NULL;
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		if (rtcp_is_SR(m)){
			rb=rtcp_SR_get_report_block(m,0);
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		}else if (rtcp_is_RR(m)){
			rb=rtcp_RR_get_report_block(m,0);
		}
		if (rb){
			unsigned int ij;
			float rt=rtp_session_get_round_trip_propagation(stream->session);
			float flost;
			ij=report_block_get_interarrival_jitter(rb);
			flost=(float)(100.0*report_block_get_fraction_lost(rb)/256.0);
			ms_message("audio_stream_process_rtcp: interarrival jitter=%u , "
			           "lost packets percentage since last report=%f, round trip time=%f seconds",ij,flost,rt);
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			if (stream->rc) ms_bitrate_controller_process_rtcp(stream->rc,m);
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			if (stream->qi) ms_quality_indicator_update_from_feedback(stream->qi,m);
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		}
	}while(rtcp_next_packet(m));
}

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void audio_stream_iterate(AudioStream *stream){
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	if (stream->is_beginning && ms_time(NULL)-stream->start_time>15){
		rtp_session_set_rtcp_report_interval(stream->session,5000);
		stream->is_beginning=FALSE;
	}
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	if (stream->evq){
		OrtpEvent *ev=ortp_ev_queue_get(stream->evq);
		if (ev!=NULL){
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			OrtpEventType evt=ortp_event_get_type(ev);
			if (evt==ORTP_EVENT_RTCP_PACKET_RECEIVED){
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				audio_stream_process_rtcp(stream,ortp_event_get_data(ev)->packet);
				stream->last_packet_time=ms_time(NULL);
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			}else if (evt==ORTP_EVENT_RTCP_PACKET_EMITTED){
				/*we choose to update the quality indicator when the oRTP stack decides to emit a RTCP report */
				ms_quality_indicator_update_local(stream->qi);
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			}
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			ortp_event_destroy(ev);
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		}
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	}
}

bool_t audio_stream_alive(AudioStream * stream, int timeout){
	const rtp_stats_t *stats=rtp_session_get_stats(stream->session);
	if (stats->recv!=0){
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		if (stats->recv!=stream->last_packet_count){
			stream->last_packet_count=stats->recv;
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			stream->last_packet_time=ms_time(NULL);
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		}
	}
	if (stats->recv!=0){
		if (ms_time(NULL)-stream->last_packet_time>timeout){
			/* more than timeout seconds of inactivity*/
			return FALSE;
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		}
	}
	return TRUE;
}

/*this function must be called from the MSTicker thread:
it replaces one filter by another one.
This is a dirty hack that works anyway.
It would be interesting to have something that does the job
simplier within the MSTicker api
*/
void audio_stream_change_decoder(AudioStream *stream, int payload){
	RtpSession *session=stream->session;
	RtpProfile *prof=rtp_session_get_profile(session);
	PayloadType *pt=rtp_profile_get_payload(prof,payload);
	if (pt!=NULL){
		MSFilter *dec=ms_filter_create_decoder(pt->mime_type);
		if (dec!=NULL){
			ms_filter_unlink(stream->rtprecv, 0, stream->decoder, 0);
			ms_filter_unlink(stream->decoder,0,stream->dtmfgen,0);
			ms_filter_postprocess(stream->decoder);
			ms_filter_destroy(stream->decoder);
			stream->decoder=dec;
			if (pt->recv_fmtp!=NULL)
				ms_filter_call_method(stream->decoder,MS_FILTER_ADD_FMTP,(void*)pt->recv_fmtp);
			ms_filter_link (stream->rtprecv, 0, stream->decoder, 0);
			ms_filter_link (stream->decoder,0 , stream->dtmfgen, 0);
			ms_filter_preprocess(stream->decoder,stream->ticker);
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		}else{
			ms_warning("No decoder found for %s",pt->mime_type);
		}
	}else{
		ms_warning("No payload defined with number %i",payload);
	}
}

static void payload_type_changed(RtpSession *session, unsigned long data){
	AudioStream *stream=(AudioStream*)data;
	int pt=rtp_session_get_recv_payload_type(stream->session);
	audio_stream_change_decoder(stream,pt);
}
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/*invoked from FEC capable filters*/
static  mblk_t* audio_stream_payload_picker(MSRtpPayloadPickerContext* context,unsigned int sequence_number) {
	return rtp_session_pick_with_cseq(((AudioStream*)(context->filter_graph_manager))->session, sequence_number);
}
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int audio_stream_start_full(AudioStream *stream, RtpProfile *profile, const char *remip,int remport,
	int rem_rtcp_port, int payload,int jitt_comp, const char *infile, const char *outfile,
	MSSndCard *playcard, MSSndCard *captcard, bool_t use_ec)
{
	RtpSession *rtps=stream->session;
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	PayloadType *pt,*tel_ev;
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	int tmp;
	MSConnectionHelper h;
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	int sample_rate;
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	MSRtpPayloadPickerContext picker_context;
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	rtp_session_set_profile(rtps,profile);
	if (remport>0) rtp_session_set_remote_addr_full(rtps,remip,remport,rem_rtcp_port);
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	if (rem_rtcp_port<=0){
		rtp_session_enable_rtcp(rtps,FALSE);
	}
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	rtp_session_set_payload_type(rtps,payload);
	rtp_session_set_jitter_compensation(rtps,jitt_comp);
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	if (remport>0)
		ms_filter_call_method(stream->rtpsend,MS_RTP_SEND_SET_SESSION,rtps);
	stream->rtprecv=ms_filter_new(MS_RTP_RECV_ID);
	ms_filter_call_method(stream->rtprecv,MS_RTP_RECV_SET_SESSION,rtps);
	stream->session=rtps;
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	stream->dtmfgen=ms_filter_new(MS_DTMF_GEN_ID);
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	rtp_session_signal_connect(rtps,"telephone-event",(RtpCallback)on_dtmf_received,(unsigned long)stream);
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	rtp_session_signal_connect(rtps,"payload_type_changed",(RtpCallback)payload_type_changed,(unsigned long)stream);
	/* creates the local part */
	if (captcard!=NULL) stream->soundread=ms_snd_card_create_reader(captcard);
	else {
		stream->soundread=ms_filter_new(MS_FILE_PLAYER_ID);
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		stream->read_resampler=ms_filter_new(MS_RESAMPLE_ID);
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		if (infile!=NULL) audio_stream_play(stream,infile);
	}
	if (playcard!=NULL) stream->soundwrite=ms_snd_card_create_writer(playcard);
	else {
		stream->soundwrite=ms_filter_new(MS_FILE_REC_ID);
		if (outfile!=NULL) audio_stream_record(stream,outfile);
	}
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	/* creates the couple of encoder/decoder */
	pt=rtp_profile_get_payload(profile,payload);
	if (pt==NULL){
		ms_error("audiostream.c: undefined payload type.");
		return -1;
	}
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	tel_ev=rtp_profile_get_payload_from_mime (profile,"telephone-event");

	if ( (tel_ev==NULL || ( (tel_ev->flags & PAYLOAD_TYPE_FLAG_CAN_RECV) && !(tel_ev->flags & PAYLOAD_TYPE_FLAG_CAN_SEND)))
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	    && ( strcasecmp(pt->mime_type,"pcmu")==0 || strcasecmp(pt->mime_type,"pcma")==0)){
		/*if no telephone-event payload is usable and pcma or pcmu is used, we will generate
		  inband dtmf*/
		stream->dtmfgen_rtp=ms_filter_new (MS_DTMF_GEN_ID);
	}
	
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	if (ms_filter_call_method(stream->rtpsend,MS_FILTER_GET_SAMPLE_RATE,&sample_rate)!=0){
		ms_error("Sample rate is unknown for RTP side !");
		return -1;
	}
	
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	stream->encoder=ms_filter_create_encoder(pt->mime_type);
	stream->decoder=ms_filter_create_decoder(pt->mime_type);
	if ((stream->encoder==NULL) || (stream->decoder==NULL)){
		/* big problem: we have not a registered codec for this payload...*/
		ms_error("mediastream.c: No decoder available for payload %i.",payload);
		return -1;
	}
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	if (ms_filter_has_method(stream->decoder, MS_FILTER_SET_RTP_PAYLOAD_PICKER)) {
		ms_message(" decoder has FEC capabilities");
		picker_context.filter_graph_manager=stream;
		picker_context.picker=&audio_stream_payload_picker;
		ms_filter_call_method(stream->decoder,MS_FILTER_SET_RTP_PAYLOAD_PICKER, &picker_context);
	}
 	stream->volsend=ms_filter_new(MS_VOLUME_ID);
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	stream->volrecv=ms_filter_new(MS_VOLUME_ID);
	audio_stream_enable_echo_limiter(stream,stream->el_type);
	audio_stream_enable_noise_gate(stream,stream->use_ng);
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	if (stream->use_agc){
		int tmp=1;
		if (stream->volsend==NULL)
			stream->volsend=ms_filter_new(MS_VOLUME_ID);
		ms_filter_call_method(stream->volsend,MS_VOLUME_ENABLE_AGC,&tmp);
	}

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	if (stream->dtmfgen)
		ms_filter_call_method(stream->dtmfgen,MS_FILTER_SET_SAMPLE_RATE,&sample_rate);
	if (stream->dtmfgen_rtp)
		ms_filter_call_method(stream->dtmfgen_rtp,MS_FILTER_SET_SAMPLE_RATE,&sample_rate);
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	/* give the sound filters some properties */
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	if (ms_filter_call_method(stream->soundread,MS_FILTER_SET_SAMPLE_RATE,&sample_rate) != 0) {
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		/* need to add resampler*/
		if (stream->read_resampler == NULL) stream->read_resampler=ms_filter_new(MS_RESAMPLE_ID);
	}

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	if (ms_filter_call_method(stream->soundwrite,MS_FILTER_SET_SAMPLE_RATE,&sample_rate) != 0) {
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		/* need to add resampler*/
		if (stream->write_resampler == NULL) stream->write_resampler=ms_filter_new(MS_RESAMPLE_ID);
	}

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	tmp=1;
	ms_filter_call_method(stream->soundwrite,MS_FILTER_SET_NCHANNELS, &tmp);
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	/*configure the echo canceller if required */
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	if (!use_ec) {
		ms_filter_destroy(stream->ec);
		stream->ec=NULL;
	}
	if (stream->ec){
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		ms_filter_call_method(stream->ec,MS_FILTER_SET_SAMPLE_RATE,&sample_rate);
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	}

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	/* give the encoder/decoder some parameters*/
	ms_filter_call_method(stream->encoder,MS_FILTER_SET_SAMPLE_RATE,&pt->clock_rate);
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	ms_message("Payload's bitrate is %i",pt->normal_bitrate);
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	if (pt->normal_bitrate>0){
		ms_message("Setting audio encoder network bitrate to %i",pt->normal_bitrate);
		ms_filter_call_method(stream->encoder,MS_FILTER_SET_BITRATE,&pt->normal_bitrate);
	}
	ms_filter_call_method(stream->decoder,MS_FILTER_SET_SAMPLE_RATE,&pt->clock_rate);
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	if (pt->send_fmtp!=NULL) ms_filter_call_method(stream->encoder,MS_FILTER_ADD_FMTP, (void*)pt->send_fmtp);
	if (pt->recv_fmtp!=NULL) ms_filter_call_method(stream->decoder,MS_FILTER_ADD_FMTP,(void*)pt->recv_fmtp);
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	/*create the equalizer*/
	stream->equalizer=ms_filter_new(MS_EQUALIZER_ID);
	tmp=stream->eq_active;
	ms_filter_call_method(stream->equalizer,MS_EQUALIZER_SET_ACTIVE,&tmp);
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	/*configure resampler if needed*/
	if (stream->read_resampler){
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		audio_stream_configure_resampler(stream->read_resampler,stream->soundread,stream->rtpsend);
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	}
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	if (stream->write_resampler){
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		audio_stream_configure_resampler(stream->write_resampler,stream->rtprecv,stream->soundwrite);
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	}
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	if (stream->use_rc){
		stream->rc=ms_audio_bitrate_controller_new(stream->session,stream->encoder,0);
	}
	stream->qi=ms_quality_indicator_new(stream->session);
	
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	/* and then connect all */
	/* tip: draw yourself the picture if you don't understand */
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	/*sending graph*/
	ms_connection_helper_start(&h);
	ms_connection_helper_link(&h,stream->soundread,-1,0);
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	if (stream->read_resampler)
		ms_connection_helper_link(&h,stream->read_resampler,0,0);
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	if (stream->ec)
		ms_connection_helper_link(&h,stream->ec,1,1);
	if (stream->volsend)
		ms_connection_helper_link(&h,stream->volsend,0,0);
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	if (stream->dtmfgen_rtp)
		ms_connection_helper_link(&h,stream->dtmfgen_rtp,0,0);
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	ms_connection_helper_link(&h,stream->encoder,0,0);
	ms_connection_helper_link(&h,stream->rtpsend,0,-1);

	/*receiving graph*/
	ms_connection_helper_start(&h);
	ms_connection_helper_link(&h,stream->rtprecv,-1,0);
	ms_connection_helper_link(&h,stream->decoder,0,0);
	ms_connection_helper_link(&h,stream->dtmfgen,0,0);
	if (stream->volrecv)
		ms_connection_helper_link(&h,stream->volrecv,0,0);
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	if (stream->equalizer)
		ms_connection_helper_link(&h,stream->equalizer,0,0);
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	if (stream->ec)
		ms_connection_helper_link(&h,stream->ec,0,0);
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	if (stream->write_resampler)
		ms_connection_helper_link(&h,stream->write_resampler,0,0);
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	ms_connection_helper_link(&h,stream->soundwrite,0,-1);
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	/* create ticker */
	stream->ticker=ms_ticker_new();
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	ms_ticker_set_name(stream->ticker,"Audio MSTicker");
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	ms_ticker_attach(stream->ticker,stream->soundread);
	ms_ticker_attach(stream->ticker,stream->rtprecv);
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	stream->start_time=ms_time(NULL);
	stream->is_beginning=TRUE;

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	return 0;
}

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void audio_stream_enable_adaptive_bitrate_control(AudioStream *st, bool_t enabled){
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	st->use_rc=enabled;
}
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int audio_stream_start_with_files(AudioStream *stream, RtpProfile *prof,const char *remip, int remport,
	int rem_rtcp_port, int pt,int jitt_comp, const char *infile, const char * outfile)
{
	return audio_stream_start_full(stream,prof,remip,remport,rem_rtcp_port,pt,jitt_comp,infile,outfile,NULL,NULL,FALSE);
}

AudioStream * audio_stream_start(RtpProfile *prof,int locport,const char *remip,int remport,int profile,int jitt_comp,bool_t use_ec)
{
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	MSSndCard *sndcard_playback;
	MSSndCard *sndcard_capture;
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	AudioStream *stream;
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	sndcard_capture=ms_snd_card_manager_get_default_capture_card(ms_snd_card_manager_get());
	sndcard_playback=ms_snd_card_manager_get_default_playback_card(ms_snd_card_manager_get());
	if (sndcard_capture==NULL || sndcard_playback==NULL)
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		return NULL;
	stream=audio_stream_new(locport, ms_is_ipv6(remip));
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	if (audio_stream_start_full(stream,prof,remip,remport,remport+1,profile,jitt_comp,NULL,NULL,sndcard_playback,sndcard_capture,use_ec)==0) return stream;
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	audio_stream_free(stream);
	return NULL;
}

AudioStream *audio_stream_start_with_sndcards(RtpProfile *prof,int locport,const char *remip,int remport,int profile,int jitt_comp,MSSndCard *playcard, MSSndCard *captcard, bool_t use_ec)
{
	AudioStream *stream;
	if (playcard==NULL) {
		ms_error("No playback card.");
		return NULL;
	}
	if (captcard==NULL) {
		ms_error("No capture card.");
		return NULL;
	}
	stream=audio_stream_new(locport, ms_is_ipv6(remip));
	if (audio_stream_start_full(stream,prof,remip,remport,remport+1,profile,jitt_comp,NULL,NULL,playcard,captcard,use_ec)==0) return stream;
	audio_stream_free(stream);
	return NULL;
}

void audio_stream_set_rtcp_information(AudioStream *st, const char *cname, const char *tool){
	if (st->session!=NULL){
		rtp_session_set_source_description(st->session,cname,NULL,NULL,NULL,NULL,tool , "This is free software (GPL) !");
	}
}

void audio_stream_play(AudioStream *st, const char *name){
	if (ms_filter_get_id(st->soundread)==MS_FILE_PLAYER_ID){
		ms_filter_call_method_noarg(st->soundread,MS_FILE_PLAYER_CLOSE);
		ms_filter_call_method(st->soundread,MS_FILE_PLAYER_OPEN,(void*)name);
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		if (st->read_resampler){
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			audio_stream_configure_resampler(st->read_resampler,st->soundread,st->rtpsend);
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		}
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		ms_filter_call_method_noarg(st->soundread,MS_FILE_PLAYER_START);
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	}else{
		ms_error("Cannot play file: the stream hasn't been started with"
		" audio_stream_start_with_files");
	}
}

void audio_stream_record(AudioStream *st, const char *name){
	if (ms_filter_get_id(st->soundwrite)==MS_FILE_REC_ID){
		ms_filter_call_method_noarg(st->soundwrite,MS_FILE_REC_CLOSE);
		ms_filter_call_method(st->soundwrite,MS_FILE_REC_OPEN,(void*)name);
		ms_filter_call_method_noarg(st->soundwrite,MS_FILE_REC_START);
	}else{
		ms_error("Cannot record file: the stream hasn't been started with"
		" audio_stream_start_with_files");
	}
}


AudioStream *audio_stream_new(int locport, bool_t ipv6){
	AudioStream *stream=(AudioStream *)ms_new0(AudioStream,1);
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	MSFilterDesc *ec_desc=ms_filter_lookup_by_name("MSOslec");
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	ms_filter_enable_statistics(TRUE);
	ms_filter_reset_statistics();
	
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	stream->session=create_duplex_rtpsession(locport,ipv6);
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	/*some filters are created right now to allow configuration by the application before start() */
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	stream->rtpsend=ms_filter_new(MS_RTP_SEND_ID);
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	if (ec_desc!=NULL)
		stream->ec=ms_filter_new_from_desc(ec_desc);
	else
		stream->ec=ms_filter_new(MS_SPEEX_EC_ID);

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	stream->evq=ortp_ev_queue_new();
	rtp_session_register_event_queue(stream->session,stream->evq);
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	stream->play_dtmfs=TRUE;
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	stream->use_gc=FALSE;
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	stream->use_agc=FALSE;
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	stream->use_ng=FALSE;
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	return stream;
}

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void audio_stream_play_received_dtmfs(AudioStream *st, bool_t yesno){
	st->play_dtmfs=yesno;
}

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int audio_stream_start_now(AudioStream *stream, RtpProfile * prof,  const char *remip, int remport, int rem_rtcp_port, int payload_type, int jitt_comp, MSSndCard *playcard, MSSndCard *captcard, bool_t use_ec){
	return audio_stream_start_full(stream,prof,remip,remport,rem_rtcp_port,
		payload_type,jitt_comp,NULL,NULL,playcard,captcard,use_ec);
}

void audio_stream_set_relay_session_id(AudioStream *stream, const char *id){
	ms_filter_call_method(stream->rtpsend, MS_RTP_SEND_SET_RELAY_SESSION_ID,(void*)id);
}

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void audio_stream_set_echo_canceller_params(AudioStream *stream, int tail_len_ms, int delay_ms, int framesize){
	if (tail_len_ms!=0)
		ms_filter_call_method(stream->ec,MS_ECHO_CANCELLER_SET_TAIL_LENGTH,&tail_len_ms);
	if (delay_ms!=0){
		ms_filter_call_method(stream->ec,MS_ECHO_CANCELLER_SET_DELAY,&delay_ms);
	}
	if (framesize!=0)
		ms_filter_call_method(stream->ec,MS_ECHO_CANCELLER_SET_FRAMESIZE,&framesize);
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}

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void audio_stream_enable_echo_limiter(AudioStream *stream, EchoLimiterType type){
	stream->el_type=type;
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	if (stream->volsend){
		bool_t enable_noise_gate = stream->el_type==ELControlFull;
		ms_filter_call_method(stream->volrecv,MS_VOLUME_ENABLE_NOISE_GATE,&enable_noise_gate);
		ms_filter_call_method(stream->volsend,MS_VOLUME_SET_PEER,type!=ELInactive?stream->volrecv:NULL);
	} else {
		ms_warning("cannot set echo limiter to mode [%i] because no volume send",type);
	}
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}

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void audio_stream_enable_gain_control(AudioStream *stream, bool_t val){
	stream->use_gc=val;
}

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void audio_stream_enable_automatic_gain_control(AudioStream *stream, bool_t val){
	stream->use_agc=val;
}

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void audio_stream_enable_noise_gate(AudioStream *stream, bool_t val){
	stream->use_ng=val;
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	if (stream->volsend){
		ms_filter_call_method(stream->volsend,MS_VOLUME_ENABLE_NOISE_GATE,&val);
	} else {
		ms_warning("cannot set noise gate mode to [%i] because no volume send",val);
	}


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}

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void audio_stream_set_mic_gain(AudioStream *stream, float gain){
	if (stream->volsend){
		ms_filter_call_method(stream->volsend,MS_VOLUME_SET_GAIN,&gain);
	}else ms_warning("Could not apply gain: gain control wasn't activated. "
			"Use audio_stream_enable_gain_control() before starting the stream.");
}

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void audio_stream_enable_equalizer(AudioStream *stream, bool_t enabled){
	stream->eq_active=enabled;
	if (stream->equalizer){
		int tmp=enabled;
		ms_filter_call_method(stream->equalizer,MS_EQUALIZER_SET_ACTIVE,&tmp);
	}
}

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void audio_stream_equalizer_set_gain(AudioStream *stream, int frequency, float gain, int freq_width){
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	if (stream->equalizer){
		MSEqualizerGain d;
		d.frequency=frequency;
		d.gain=gain;
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		d.width=freq_width;
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		ms_filter_call_method(stream->equalizer,MS_EQUALIZER_SET_GAIN,&d);
	}
}

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void audio_stream_stop(AudioStream * stream)
{
	if (stream->ticker){
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		MSConnectionHelper h;
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		ms_ticker_detach(stream->ticker,stream->soundread);
		ms_ticker_detach(stream->ticker,stream->rtprecv);
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		rtp_stats_display(rtp_session_get_stats(stream->session),"Audio session's RTP statistics");
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		/*dismantle the outgoing graph*/
		ms_connection_helper_start(&h);
		ms_connection_helper_unlink(&h,stream->soundread,-1,0);
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		if (stream->read_resampler!=NULL)
			ms_connection_helper_unlink(&h,stream->read_resampler,0,0);
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		if (stream->ec!=NULL)
			ms_connection_helper_unlink(&h,stream->ec,1,1);
		if (stream->volsend!=NULL)
			ms_connection_helper_unlink(&h,stream->volsend,0,0);
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		if (stream->dtmfgen_rtp)
			ms_connection_helper_unlink(&h,stream->dtmfgen_rtp,0,0);
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		ms_connection_helper_unlink(&h,stream->encoder,0,0);
		ms_connection_helper_unlink(&h,stream->rtpsend,0,-1);

		/*dismantle the receiving graph*/
		ms_connection_helper_start(&h);
		ms_connection_helper_unlink(&h,stream->rtprecv,-1,0);
		ms_connection_helper_unlink(&h,stream->decoder,0,0);
		ms_connection_helper_unlink(&h,stream->dtmfgen,0,0);
		if (stream->volrecv!=NULL)
			ms_connection_helper_unlink(&h,stream->volrecv,0,0);
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		if (stream->equalizer)
			ms_connection_helper_unlink(&h,stream->equalizer,0,0);
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		if (stream->ec!=NULL)
			ms_connection_helper_unlink(&h,stream->ec,0,0);
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		if (stream->write_resampler!=NULL)
			ms_connection_helper_unlink(&h,stream->write_resampler,0,0);
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		ms_connection_helper_unlink(&h,stream->soundwrite,0,-1);

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	}
	audio_stream_free(stream);
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	ms_filter_log_statistics();
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}

RingStream * ring_start(const char *file, int interval, MSSndCard *sndcard){
   return ring_start_with_cb(file,interval,sndcard,NULL,NULL);
}

RingStream * ring_start_with_cb(const char *file,int interval,MSSndCard *sndcard, MSFilterNotifyFunc func,void * user_data)
{
	RingStream *stream;
	int tmp;
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	int srcrate,dstrate;
	MSConnectionHelper h;

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	stream=(RingStream *)ms_new0(RingStream,1);
	stream->source=ms_filter_new(MS_FILE_PLAYER_ID);
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	if (file)
		ms_filter_call_method(stream->source,MS_FILE_PLAYER_OPEN,(void*)file);
	
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	ms_filter_call_method(stream->source,MS_FILE_PLAYER_LOOP,&interval);
	ms_filter_call_method_noarg(stream->source,MS_FILE_PLAYER_START);
	if (func!=NULL)
		ms_filter_set_notify_callback(stream->source,func,user_data);
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	stream->gendtmf=ms_filter_new(MS_DTMF_GEN_ID);
	
	
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	stream->sndwrite=ms_snd_card_create_writer(sndcard);
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	ms_filter_call_method(stream->source,MS_FILTER_GET_SAMPLE_RATE,&srcrate);
	ms_filter_call_method(stream->gendtmf,MS_FILTER_SET_SAMPLE_RATE,&srcrate);
	ms_filter_call_method(stream->sndwrite,MS_FILTER_SET_SAMPLE_RATE,&srcrate);
	ms_filter_call_method(stream->sndwrite,MS_FILTER_GET_SAMPLE_RATE,&dstrate);
	if (srcrate!=dstrate){
		stream->write_resampler=ms_filter_new(MS_RESAMPLE_ID);
		ms_filter_call_method(stream->write_resampler,MS_FILTER_SET_SAMPLE_RATE,&srcrate);
		ms_filter_call_method(stream->write_resampler,MS_FILTER_SET_OUTPUT_SAMPLE_RATE,&dstrate);
		ms_message("configuring resampler from rate[%i] to rate [%i]", srcrate,dstrate);
	}
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	ms_filter_call_method(stream->source,MS_FILTER_GET_NCHANNELS,&tmp);
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	ms_filter_call_method(stream->gendtmf,MS_FILTER_SET_NCHANNELS,&tmp);
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	ms_filter_call_method(stream->sndwrite,MS_FILTER_SET_NCHANNELS,&tmp);
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	stream->ticker=ms_ticker_new();
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	ms_ticker_set_name(stream->ticker,"Audio (ring) MSTicker");
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	ms_connection_helper_start(&h);
	ms_connection_helper_link(&h,stream->source,-1,0);
	ms_connection_helper_link(&h,stream->gendtmf,0,0);
	if (stream->write_resampler)
		ms_connection_helper_link(&h,stream->write_resampler,0,0);
	ms_connection_helper_link(&h,stream->sndwrite,0,-1);
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	ms_ticker_attach(stream->ticker,stream->source);
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	return stream;
}

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void ring_play_dtmf(RingStream *stream, char dtmf, int duration_ms){
	if (duration_ms>0)
		ms_filter_call_method(stream->gendtmf, MS_DTMF_GEN_PLAY, &dtmf);
	else ms_filter_call_method(stream->gendtmf, MS_DTMF_GEN_START, &dtmf);
}

void ring_stop_dtmf(RingStream *stream){
	ms_filter_call_method_noarg(stream->gendtmf, MS_DTMF_GEN_STOP);
}

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void ring_stop(RingStream *stream){
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	MSConnectionHelper h;
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	ms_ticker_detach(stream->ticker,stream->source);
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	ms_connection_helper_start(&h);
	ms_connection_helper_unlink(&h,stream->source,-1,0);
	ms_connection_helper_unlink(&h,stream->gendtmf,0,0);
	if (stream->write_resampler)
		ms_connection_helper_unlink(&h,stream->write_resampler,0,0);
	ms_connection_helper_unlink(&h,stream->sndwrite,0,-1);

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	ms_ticker_destroy(stream->ticker);
	ms_filter_destroy(stream->source);
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	ms_filter_destroy(stream->gendtmf);
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	ms_filter_destroy(stream->sndwrite);
	ms_free(stream);
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#ifdef _WIN32_WCE
	ms_warning("Sleeping a bit after closing the audio device...");
	ms_sleep(1);
#endif
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}


int audio_stream_send_dtmf(AudioStream *stream, char dtmf)
{
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	if (stream->dtmfgen_rtp)
		ms_filter_call_method(stream->dtmfgen_rtp,MS_DTMF_GEN_PLAY,&dtmf);
	else if (stream->rtpsend)
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		ms_filter_call_method(stream->rtpsend,MS_RTP_SEND_SEND_DTMF,&dtmf);
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	return 0;
}
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void audio_stream_get_local_rtp_stats(AudioStream *stream, rtp_stats_t *lstats){
	if (stream->session){
		const rtp_stats_t *stats=rtp_session_get_stats(stream->session);
		memcpy(lstats,stats,sizeof(*stats));
	}else memset(lstats,0,sizeof(rtp_stats_t));
}
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void audio_stream_mute_rtp(AudioStream *stream, bool_t val) 
{
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	if (stream->rtpsend){
		if (val)
			ms_filter_call_method(stream->rtpsend,MS_RTP_SEND_MUTE_MIC,&val);
		else
			ms_filter_call_method(stream->rtpsend,MS_RTP_SEND_UNMUTE_MIC,&val);
	}
}

float audio_stream_get_quality_rating(AudioStream *stream){
	if (stream->qi){
		return ms_quality_indicator_get_rating(stream->qi);
	}
	return 0;
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}
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MS2_PUBLIC float audio_stream_get_average_quality_rating(AudioStream *stream){
	if (stream->qi){
		return ms_quality_indicator_get_average_rating(stream->qi);
	}
	return 0;
}
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void audio_stream_enable_zrtp(AudioStream *stream, OrtpZrtpParams *params){
	stream->ortpZrtpContext=ortp_zrtp_context_new(stream->session, params);
}
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bool_t audio_stream_enable_strp(AudioStream* stream, enum ortp_srtp_crypto_suite_t suite, const char* snd_key, const char* rcv_key) {
	// assign new srtp transport to stream->session
	// with 2 Master Keys
	RtpTransport *rtp_tpt, *rtcp_tpt;	
	
	if (!ortp_srtp_supported()) {
		ms_error("ortp srtp support not enabled");
		return FALSE;
	}
	
	ms_message("%s: stream=%p key='%s' key='%s'", __FUNCTION__,
		stream, snd_key, rcv_key);
	 
	stream->srtp_session = ortp_srtp_create_configure_session(suite, 
		rtp_session_get_send_ssrc(stream->session), 
		snd_key, 
		rcv_key); 
	
	if (!stream->srtp_session) {
		return FALSE;
	}
	
	// TODO: check who will free rtp_tpt ?
	srtp_transport_new(stream->srtp_session, &rtp_tpt, &rtcp_tpt);
	
	rtp_session_set_transports(stream->session, rtp_tpt, rtcp_tpt);
	
	return TRUE;
}