tg2sip/libtgvoip/audio/SoftwareAudioOutput.cpp

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2018-10-04 07:03:20 +00:00
#include <cassert>
#include "SoftwareAudioOutput.h"
using namespace tgvoip::audio;
SoftwareAudioOutput::SoftwareAudioOutput() {
isActive = false;
pj_pool = pjsua_pool_create("output%p", 2048, 512);
media_port = PJ_POOL_ZALLOC_T(pj_pool, pjmedia_port);
pj_status_t status;
pj_str_t name = pj_str((char *) "output");
// ptime = 10ms -> 480 samples per frame
status = pjmedia_port_info_init(&media_port->info,
&name,
PJMEDIA_SIG_CLASS_PORT_AUD('S', 'O'), // Software Output SIG
48000, 1, 16, 480);
assert(status == PJ_SUCCESS);
media_port->port_data.pdata = this;
media_port->put_frame = &PutFrameCallback;
media_port->get_frame = &GetFrameCallback;
registerMediaPort(media_port);
// 48kHz * 20 ms * 16 bits per sample
buffer = new unsigned char[1920];
}
SoftwareAudioOutput::~SoftwareAudioOutput() {
unregisterMediaPort();
pjmedia_port_destroy(media_port);
pj_pool_release(pj_pool);
if (buffer) {
delete buffer;
}
}
void SoftwareAudioOutput::Start() {
isActive = true;
}
void SoftwareAudioOutput::Stop() {
isActive = false;
}
bool SoftwareAudioOutput::IsPlaying() {
return isActive;
}
pj_status_t SoftwareAudioOutput::PutFrameCallback(pjmedia_port *port, pjmedia_frame *frame) {
frame->size = 0;
frame->type = PJMEDIA_FRAME_TYPE_NONE;
return PJ_SUCCESS;
}
pj_status_t SoftwareAudioOutput::GetFrameCallback(pjmedia_port *port, pjmedia_frame *frame) {
auto output = (SoftwareAudioOutput *) port->port_data.pdata;
if (!output->isActive) {
frame->type = PJMEDIA_FRAME_TYPE_NONE;
frame->size = 0;
return PJ_SUCCESS;
}
// libtgvoip ptime = 20ms
if (output->read_buffer) {
output->InvokeCallback(output->buffer, 1920);
memcpy(frame->buf, output->buffer, 960);
} else {
memcpy(frame->buf, output->buffer + 960, 960);
}
output->read_buffer = !output->read_buffer;
return PJ_SUCCESS;
}