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/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "LibWebRTCAudioModule.h"
#if USE(LIBWEBRTC)
namespace WebCore {
LibWebRTCAudioModule::LibWebRTCAudioModule()
: m_audioTaskRunner(rtc::Thread::Create())
{
m_audioTaskRunner->Start();
}
int32_t LibWebRTCAudioModule::RegisterAudioCallback(webrtc::AudioTransport* audioTransport)
{
m_audioTransport = audioTransport;
return 0;
}
void LibWebRTCAudioModule::OnMessage(rtc::Message* message)
{
ASSERT_UNUSED(message, message->message_id == 1);
StartPlayoutOnAudioThread();
}
int32_t LibWebRTCAudioModule::StartPlayout()
{
if (!m_isPlaying && m_audioTaskRunner) {
m_audioTaskRunner->Post(RTC_FROM_HERE, this, 1);
m_isPlaying = true;
}
return 0;
}
int32_t LibWebRTCAudioModule::StopPlayout()
{
if (m_isPlaying)
m_isPlaying = false;
return 0;
}
// libwebrtc uses 10ms frames.
const unsigned samplingRate = 48000;
const unsigned frameLengthMs = 10;
const unsigned samplesPerFrame = samplingRate * frameLengthMs / 1000;
const unsigned pollSamples = 5;
const unsigned pollInterval = 5 * frameLengthMs;
const unsigned channels = 2;
const unsigned bytesPerSample = 2;
void LibWebRTCAudioModule::StartPlayoutOnAudioThread()
{
while (true) {
PollFromSource();
m_audioTaskRunner->SleepMs(pollInterval);
if (!m_isPlaying)
return;
}
}
void LibWebRTCAudioModule::PollFromSource()
{
if (!m_audioTransport)
return;
for (unsigned i = 0; i < pollSamples; i++) {
int64_t elapsedTime = -1;
int64_t ntpTime = -1;
char data[(bytesPerSample * channels * samplesPerFrame)];
m_audioTransport->PullRenderData(bytesPerSample * 8, samplingRate, channels, samplesPerFrame, data, &elapsedTime, &ntpTime);
}
}
} // namespace WebCore
#endif // USE(LIBWEBRTC)
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