sip语音通话获取双路音频方法

主要用到位于 pjsua.h 中的2个回调函数来获取
on_aud_prev_play_frame
on_aud_prev_rec_frame

    //pjsua.h 

	...

    /**
     * Optional callback for audio frame preview right before queued to
     * the speaker.
     * Notes:
     * - application MUST NOT block or perform long operation in the callback
     *   as the callback may be executed in sound device thread
     * - when using software echo cancellation, application MUST NOT modify
     *   the audio data from within the callback, otherwise the echo canceller
     *   will not work properly.
     */
    void (*on_aud_prev_play_frame)(pjmedia_frame *frame);

    /**
     * Optional callback for audio frame preview recorded from the microphone
     * before being processed by any media component such as software echo
     * canceller.
     * Notes:
     * - application MUST NOT block or perform long operation in the callback
     *   as the callback may be executed in sound device thread
     * - when using software echo cancellation, application MUST NOT modify
     *   the audio data from within the callback, otherwise the echo canceller
     *   will not work properly.
     */
    void (*on_aud_prev_rec_frame)(pjmedia_frame *frame);

在初始化之前设定好pjsua_media_config 的这2个回调函数
media_cfg.on_aud_prev_play_frame = &play_frame;//对方说话音频
media_cfg.on_aud_prev_rec_frame = &rec_frame;//自己说话音频

	// pj create
	pj_status_t status;
	pjsua_config         ua_cfg;
	pjsua_media_config   media_cfg;
	pjsua_transport_config cfg;

	// Must create pjsua before anything else!
	status = pjsua_create();
	if (status != PJ_SUCCESS)
	{
		LOG_FUNC_QUIT(LOG_SYS);
		return;
	}
	LoggerCio::notice(LoggerCio::LOG_SYS,"*** sip pjsua_create() success!");
	
	// Initialize configs with default settings.
	pjsua_config_default(&ua_cfg);
	pjsua_media_config_default(&media_cfg);

	CString userAgent;
	userAgent.Format(_T("%s/%s"), _T("CioSIP"), _T("1.0.0"));
	ua_cfg.user_agent = StrToPjStr(userAgent);

	//设置回调函数
	ua_cfg.cb.on_reg_state2=&on_reg_state2;
	ua_cfg.cb.on_call_state=&on_call_state;
	ua_cfg.cb.on_call_media_state = &on_call_media_state;
	ua_cfg.cb.on_incoming_call = &on_incoming_call;
	//ua_cfg.cb.on_nat_detect= &on_nat_detect;
	ua_cfg.cb.on_buddy_state = &on_buddy_state;	//订阅分机状态
	//ua_cfg.cb.on_pager = &on_pager;
	//ua_cfg.cb.on_pager_status = &on_pager_status;
	//ua_cfg.cb.on_call_transfer_request2 = &on_call_transfer_request2;	
	//ua_cfg.cb.on_call_transfer_status = &on_call_transfer_status;
	ua_cfg.srtp_secure_signaling=0;

	media_cfg.enable_ice = PJ_FALSE;
	media_cfg.no_vad = /*accountSettings.vad ? PJ_FALSE :*/ PJ_TRUE;
	media_cfg.ec_tail_len = /*accountSettings.ec ? PJSUA_DEFAULT_EC_TAIL_LEN :*/ 0;

	media_cfg.clock_rate=44100;
	media_cfg.channel_count=2;

	// add [2019-2-23 By Pafey]
	media_cfg.on_aud_prev_play_frame = &play_frame;//对方说话音频
	media_cfg.on_aud_prev_rec_frame = &rec_frame;//自己说话音频
	
	status = pjsua_init(&ua_cfg, NULL, &media_cfg);

定义回调函数来接收2路音频，再去做后续处理。

//对方说话音频
static void play_frame(pjmedia_frame *frame)
{
	if( PJMEDIA_FRAME_TYPE_AUDIO == frame->type || PJMEDIA_FRAME_TYPE_EXTENDED == frame->type)
	{
		//CString str;
		//str.Format(_T("speaker frame size：%d\n"),frame->size);
		//OutputDebugStringW(str);
		mainDlg->sendSpeakAudioData(frame->size,(LPBYTE)frame->buf);
	}
}
//自己说话音频
static void rec_frame(pjmedia_frame *frame)
{
	if( PJMEDIA_FRAME_TYPE_AUDIO == frame->type || PJMEDIA_FRAME_TYPE_EXTENDED == frame->type)
	{
		//CString str;
		//str.Format(_T("microphone frame size：%d\n"),frame->size);
		//OutputDebugStringW(str);
		mainDlg->onCaptureData(frame->size,(LPARAM)frame->buf);
	}
}