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#include "config.h"
#include "base.h"
#include <algorithm>
#include <array>
#include <atomic>
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <mmreg.h>
#include "albit.h"
#include "core/logging.h"
#include "aloptional.h"
#endif
#include "atomic.h"
#include "core/devformat.h"
bool BackendBase::reset()
{ throw al::backend_exception{al::backend_error::DeviceError, "Invalid BackendBase call"}; }
void BackendBase::captureSamples(al::byte*, uint)
{ }
uint BackendBase::availableSamples()
{ return 0; }
ClockLatency BackendBase::getClockLatency()
{
ClockLatency ret;
uint refcount;
do {
refcount = mDevice->waitForMix();
ret.ClockTime = GetDeviceClockTime(mDevice);
std::atomic_thread_fence(std::memory_order_acquire);
} while(refcount != ReadRef(mDevice->MixCount));
/* NOTE: The device will generally have about all but one periods filled at
* any given time during playback. Without a more accurate measurement from
* the output, this is an okay approximation.
*/
ret.Latency = std::max(std::chrono::seconds{mDevice->BufferSize-mDevice->UpdateSize},
std::chrono::seconds::zero());
ret.Latency /= mDevice->Frequency;
return ret;
}
void BackendBase::setDefaultWFXChannelOrder()
{
mDevice->RealOut.ChannelIndex.fill(INVALID_CHANNEL_INDEX);
switch(mDevice->FmtChans)
{
case DevFmtMono:
mDevice->RealOut.ChannelIndex[FrontCenter] = 0;
break;
case DevFmtStereo:
mDevice->RealOut.ChannelIndex[FrontLeft] = 0;
mDevice->RealOut.ChannelIndex[FrontRight] = 1;
break;
case DevFmtQuad:
mDevice->RealOut.ChannelIndex[FrontLeft] = 0;
mDevice->RealOut.ChannelIndex[FrontRight] = 1;
mDevice->RealOut.ChannelIndex[BackLeft] = 2;
mDevice->RealOut.ChannelIndex[BackRight] = 3;
break;
case DevFmtX51:
mDevice->RealOut.ChannelIndex[FrontLeft] = 0;
mDevice->RealOut.ChannelIndex[FrontRight] = 1;
mDevice->RealOut.ChannelIndex[FrontCenter] = 2;
mDevice->RealOut.ChannelIndex[LFE] = 3;
mDevice->RealOut.ChannelIndex[SideLeft] = 4;
mDevice->RealOut.ChannelIndex[SideRight] = 5;
break;
case DevFmtX61:
mDevice->RealOut.ChannelIndex[FrontLeft] = 0;
mDevice->RealOut.ChannelIndex[FrontRight] = 1;
mDevice->RealOut.ChannelIndex[FrontCenter] = 2;
mDevice->RealOut.ChannelIndex[LFE] = 3;
mDevice->RealOut.ChannelIndex[BackCenter] = 4;
mDevice->RealOut.ChannelIndex[SideLeft] = 5;
mDevice->RealOut.ChannelIndex[SideRight] = 6;
break;
case DevFmtX71:
mDevice->RealOut.ChannelIndex[FrontLeft] = 0;
mDevice->RealOut.ChannelIndex[FrontRight] = 1;
mDevice->RealOut.ChannelIndex[FrontCenter] = 2;
mDevice->RealOut.ChannelIndex[LFE] = 3;
mDevice->RealOut.ChannelIndex[BackLeft] = 4;
mDevice->RealOut.ChannelIndex[BackRight] = 5;
mDevice->RealOut.ChannelIndex[SideLeft] = 6;
mDevice->RealOut.ChannelIndex[SideRight] = 7;
break;
case DevFmtAmbi3D:
break;
}
}
void BackendBase::setDefaultChannelOrder()
{
mDevice->RealOut.ChannelIndex.fill(INVALID_CHANNEL_INDEX);
switch(mDevice->FmtChans)
{
case DevFmtX51:
mDevice->RealOut.ChannelIndex[FrontLeft] = 0;
mDevice->RealOut.ChannelIndex[FrontRight] = 1;
mDevice->RealOut.ChannelIndex[SideLeft] = 2;
mDevice->RealOut.ChannelIndex[SideRight] = 3;
mDevice->RealOut.ChannelIndex[FrontCenter] = 4;
mDevice->RealOut.ChannelIndex[LFE] = 5;
return;
case DevFmtX71:
mDevice->RealOut.ChannelIndex[FrontLeft] = 0;
mDevice->RealOut.ChannelIndex[FrontRight] = 1;
mDevice->RealOut.ChannelIndex[BackLeft] = 2;
mDevice->RealOut.ChannelIndex[BackRight] = 3;
mDevice->RealOut.ChannelIndex[FrontCenter] = 4;
mDevice->RealOut.ChannelIndex[LFE] = 5;
mDevice->RealOut.ChannelIndex[SideLeft] = 6;
mDevice->RealOut.ChannelIndex[SideRight] = 7;
return;
/* Same as WFX order */
case DevFmtMono:
case DevFmtStereo:
case DevFmtQuad:
case DevFmtX61:
case DevFmtAmbi3D:
setDefaultWFXChannelOrder();
break;
}
}
#ifdef _WIN32
void BackendBase::setChannelOrderFromWFXMask(uint chanmask)
{
static constexpr uint x51{SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | SPEAKER_FRONT_CENTER
| SPEAKER_LOW_FREQUENCY | SPEAKER_SIDE_LEFT | SPEAKER_SIDE_RIGHT};
static constexpr uint x51rear{SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | SPEAKER_FRONT_CENTER
| SPEAKER_LOW_FREQUENCY | SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT};
/* Swap a 5.1 mask using the back channels for one with the sides. */
if(chanmask == x51rear) chanmask = x51;
auto get_channel = [](const DWORD chanbit) noexcept -> al::optional<Channel>
{
switch(chanbit)
{
case SPEAKER_FRONT_LEFT: return al::make_optional(FrontLeft);
case SPEAKER_FRONT_RIGHT: return al::make_optional(FrontRight);
case SPEAKER_FRONT_CENTER: return al::make_optional(FrontCenter);
case SPEAKER_LOW_FREQUENCY: return al::make_optional(LFE);
case SPEAKER_BACK_LEFT: return al::make_optional(BackLeft);
case SPEAKER_BACK_RIGHT: return al::make_optional(BackRight);
case SPEAKER_FRONT_LEFT_OF_CENTER: break;
case SPEAKER_FRONT_RIGHT_OF_CENTER: break;
case SPEAKER_BACK_CENTER: return al::make_optional(BackCenter);
case SPEAKER_SIDE_LEFT: return al::make_optional(SideLeft);
case SPEAKER_SIDE_RIGHT: return al::make_optional(SideRight);
case SPEAKER_TOP_CENTER: return al::make_optional(TopCenter);
case SPEAKER_TOP_FRONT_LEFT: return al::make_optional(TopFrontLeft);
case SPEAKER_TOP_FRONT_CENTER: return al::make_optional(TopFrontCenter);
case SPEAKER_TOP_FRONT_RIGHT: return al::make_optional(TopFrontRight);
case SPEAKER_TOP_BACK_LEFT: return al::make_optional(TopBackLeft);
case SPEAKER_TOP_BACK_CENTER: return al::make_optional(TopBackCenter);
case SPEAKER_TOP_BACK_RIGHT: return al::make_optional(TopBackRight);
}
WARN("Unhandled WFX channel bit 0x%lx\n", chanbit);
return al::nullopt;
};
const uint numchans{mDevice->channelsFromFmt()};
uint idx{0};
while(chanmask)
{
const int bit{al::countr_zero(chanmask)};
const uint mask{1u << bit};
chanmask &= ~mask;
if(auto label = get_channel(mask))
{
mDevice->RealOut.ChannelIndex[*label] = idx;
if(++idx == numchans) break;
}
}
}
#endif
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