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/*
* Copyright (C) 2014-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#include "ALSAHControlMonitor.h"
#include "ServiceBroker.h"
#include "cores/AudioEngine/Engines/ActiveAE/ActiveAE.h"
#include "utils/log.h"
#include "platform/linux/FDEventMonitor.h"
CALSAHControlMonitor::CALSAHControlMonitor() = default;
CALSAHControlMonitor::~CALSAHControlMonitor()
{
Clear();
}
bool CALSAHControlMonitor::Add(const std::string& ctlHandleName,
snd_ctl_elem_iface_t interface,
unsigned int device,
const std::string& name)
{
snd_hctl_t *hctl = GetHandle(ctlHandleName);
if (!hctl)
{
return false;
}
snd_ctl_elem_id_t *id;
snd_ctl_elem_id_alloca(&id);
snd_ctl_elem_id_set_interface(id, interface);
snd_ctl_elem_id_set_name (id, name.c_str());
snd_ctl_elem_id_set_device (id, device);
snd_hctl_elem_t *elem = snd_hctl_find_elem(hctl, id);
if (!elem)
{
PutHandle(ctlHandleName);
return false;
}
snd_hctl_elem_set_callback(elem, HCTLCallback);
return true;
}
void CALSAHControlMonitor::Clear()
{
Stop();
for (std::map<std::string, CTLHandle>::iterator it = m_ctlHandles.begin();
it != m_ctlHandles.end(); ++it)
{
snd_hctl_close(it->second.handle);
}
m_ctlHandles.clear();
}
void CALSAHControlMonitor::Start()
{
assert(m_fdMonitorIds.empty());
std::vector<struct pollfd> pollfds;
std::vector<CFDEventMonitor::MonitoredFD> monitoredFDs;
for (std::map<std::string, CTLHandle>::iterator it = m_ctlHandles.begin();
it != m_ctlHandles.end(); ++it)
{
pollfds.resize(snd_hctl_poll_descriptors_count(it->second.handle));
int fdcount = snd_hctl_poll_descriptors(it->second.handle, &pollfds[0], pollfds.size());
for (int j = 0; j < fdcount; ++j)
{
monitoredFDs.emplace_back(pollfds[j].fd, pollfds[j].events, FDEventCallback, it->second.handle);
}
}
const auto eventMonitor = CServiceBroker::GetPlatform().GetService<CFDEventMonitor>();
eventMonitor->AddFDs(monitoredFDs, m_fdMonitorIds);
}
void CALSAHControlMonitor::Stop()
{
const auto eventMonitor = CServiceBroker::GetPlatform().GetService<CFDEventMonitor>();
eventMonitor->RemoveFDs(m_fdMonitorIds);
m_fdMonitorIds.clear();
}
int CALSAHControlMonitor::HCTLCallback(snd_hctl_elem_t *elem, unsigned int mask)
{
/* _REMOVE is a special value instead of a bit and must be checked first */
if (mask == SND_CTL_EVENT_MASK_REMOVE)
{
/* Either the device was removed (which is handled in ALSADeviceMonitor instead)
* or snd_hctl_close() got called. */
return 0;
}
if (mask & SND_CTL_EVENT_MASK_VALUE)
{
CLog::Log(LOGDEBUG, "CALSAHControlMonitor - Monitored ALSA hctl value changed");
/*
* Currently we just re-enumerate on any change.
* Custom callbacks for handling other control monitoring may be implemented when needed.
*/
CServiceBroker::GetActiveAE()->DeviceChange();
}
return 0;
}
void CALSAHControlMonitor::FDEventCallback(int id, int fd, short revents, void *data)
{
/* Run ALSA event handling when the FD has events */
snd_hctl_t *hctl = (snd_hctl_t *)data;
snd_hctl_handle_events(hctl);
}
snd_hctl_t* CALSAHControlMonitor::GetHandle(const std::string& ctlHandleName)
{
if (!m_ctlHandles.count(ctlHandleName))
{
snd_hctl_t *hctl;
if (snd_hctl_open(&hctl, ctlHandleName.c_str(), 0) != 0)
{
CLog::Log(LOGWARNING, "CALSAHControlMonitor::GetHandle - snd_hctl_open() failed for \"{}\"",
ctlHandleName);
return NULL;
}
if (snd_hctl_load(hctl) != 0)
{
CLog::Log(LOGERROR, "CALSAHControlMonitor::GetHandle - snd_hctl_load() failed for \"{}\"",
ctlHandleName);
snd_hctl_close(hctl);
return NULL;
}
snd_hctl_nonblock(hctl, 1);
m_ctlHandles[ctlHandleName] = CTLHandle(hctl);
}
m_ctlHandles[ctlHandleName].useCount++;
return m_ctlHandles[ctlHandleName].handle;
}
void CALSAHControlMonitor::PutHandle(const std::string& ctlHandleName)
{
if (--m_ctlHandles[ctlHandleName].useCount == 0)
{
snd_hctl_close(m_ctlHandles[ctlHandleName].handle);
m_ctlHandles.erase(ctlHandleName);
}
}
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