audio_receive_thread.cpp

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/*
 *  Copyright (C) 2004-2025 Savoir-faire Linux Inc.
 *
 *  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 3 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, see <https://www.gnu.org/licenses/>.
 */
 
#include "audio_receive_thread.h"
#include "libav_deps.h"
#include "logger.h"
#include "manager.h"
#include "media_decoder.h"
#include "media_io_handle.h"
#include "media_recorder.h"
#include "ringbuffer.h"
#include "ringbufferpool.h"
 
#include <memory>
 
namespace jami {
 
AudioReceiveThread::AudioReceiveThread(const std::string& streamId,
                                       const AudioFormat& format,
                                       const std::string& sdp,
                                       const uint16_t mtu)
    : streamId_(streamId)
    , format_(format)
    , stream_(sdp)
    , sdpContext_(new MediaIOHandle(sdp.size(), false, &readFunction, 0, 0, this))
    , mtu_(mtu)
    , loop_(std::bind(&AudioReceiveThread::setup, this),
            std::bind(&AudioReceiveThread::process, this),
            std::bind(&AudioReceiveThread::cleanup, this))
{}
 
AudioReceiveThread::~AudioReceiveThread()
{
    loop_.join();
}
 
bool
AudioReceiveThread::setup()
{
    std::lock_guard lk(mutex_);
    audioDecoder_.reset(new MediaDecoder([this](std::shared_ptr<MediaFrame>&& frame) mutable {
        notify(frame);
        ringbuffer_->put(std::static_pointer_cast<AudioFrame>(frame));
    }));
    audioDecoder_->setContextCallback([this]() {
        if (recorderCallback_)
            recorderCallback_(getInfo());
    });
    audioDecoder_->setInterruptCallback(interruptCb, this);
 
    // custom_io so the SDP demuxer will not open any UDP connections
    args_.input = SDP_FILENAME;
    args_.format = "sdp";
    args_.sdp_flags = "custom_io";
 
    if (stream_.str().empty()) {
        JAMI_ERR("No SDP loaded");
        return false;
    }
 
    audioDecoder_->setIOContext(sdpContext_.get());
    audioDecoder_->setFEC(true);
    if (audioDecoder_->openInput(args_)) {
        JAMI_ERR("Unable to open input \"%s\"", SDP_FILENAME);
        return false;
    }
 
    // Now replace our custom AVIOContext with one that will read packets
    audioDecoder_->setIOContext(demuxContext_.get());
    if (audioDecoder_->setupAudio()) {
        JAMI_ERR("decoder IO startup failed");
        return false;
    }
 
    ringbuffer_ = Manager::instance().getRingBufferPool().createRingBuffer(streamId_);
 
    if (onSuccessfulSetup_)
        onSuccessfulSetup_(MEDIA_AUDIO, 1);
 
    return true;
}
 
void
AudioReceiveThread::process()
{
    audioDecoder_->decode();
}
 
void
AudioReceiveThread::cleanup()
{
    std::lock_guard lk(mutex_);
    audioDecoder_.reset();
    demuxContext_.reset();
}
 
int
AudioReceiveThread::readFunction(void* opaque, uint8_t* buf, int buf_size)
{
    std::istream& is = static_cast<AudioReceiveThread*>(opaque)->stream_;
    is.read(reinterpret_cast<char*>(buf), buf_size);
 
    auto count = is.gcount();
    return count ? count : AVERROR_EOF;
}
 
// This callback is used by libav internally to break out of blocking calls
int
AudioReceiveThread::interruptCb(void* data)
{
    auto context = static_cast<AudioReceiveThread*>(data);
    return not context->loop_.isRunning();
}
 
void
AudioReceiveThread::addIOContext(SocketPair& socketPair)
{
    demuxContext_.reset(socketPair.createIOContext(mtu_));
}
 
void
AudioReceiveThread::setRecorderCallback(
    const std::function<void(const MediaStream& ms)>& cb)
{
    recorderCallback_ = cb;
    if (audioDecoder_)
        audioDecoder_->setContextCallback([this]() {
            if (recorderCallback_)
                recorderCallback_(getInfo());
        });
}
 
MediaStream
AudioReceiveThread::getInfo() const
{
    if (!audioDecoder_)
        return {};
    return audioDecoder_->getStream("a:remote");
}
 
void
AudioReceiveThread::startReceiver()
{
    loop_.start();
}
 
void
AudioReceiveThread::stopReceiver()
{
    loop_.stop();
}
 
}; // namespace jami