// Begin playing audio from the specified stream
bool MHIContext::BeginAudio(const QString &stream, int tag)
{
LOG(VB_MHEG, LOG_INFO, QString("[mhi] BeginAudio %1 %2").arg(stream).arg(tag));
int chan = GetChannelIndex(stream);
if (chan < 0)
return false;
if (chan != m_currentStream)
{
// We have to tune to the channel where the audio is to be found.
// Because the audio and video are both components of an MHEG stream
// they will both be on the same channel.
m_currentStream = chan;
m_audioTag = tag;
return TuneTo(chan, kTuneKeepChnl|kTuneQuietly|kTuneKeepApp);
}
if (tag < 0)
return true; // Leave it at the default.
else if (m_parent->GetNVP())
return m_parent->GetNVP()->SetAudioByComponentTag(tag);
else
return false;
}
static void InitHrtfPanning(ALCdevice *device)
{
static const enum Channel CubeChannels[MAX_OUTPUT_CHANNELS] = {
UpperFrontLeft, UpperFrontRight, UpperBackLeft, UpperBackRight,
LowerFrontLeft, LowerFrontRight, LowerBackLeft, LowerBackRight,
InvalidChannel, InvalidChannel, InvalidChannel, InvalidChannel,
InvalidChannel, InvalidChannel, InvalidChannel, InvalidChannel
};
static const ChannelMap Cube8Cfg[8] = {
{ UpperFrontLeft, { 0.176776695f, 0.072168784f, 0.072168784f, 0.072168784f } },
{ UpperFrontRight, { 0.176776695f, 0.072168784f, -0.072168784f, 0.072168784f } },
{ UpperBackLeft, { 0.176776695f, -0.072168784f, 0.072168784f, 0.072168784f } },
{ UpperBackRight, { 0.176776695f, -0.072168784f, -0.072168784f, 0.072168784f } },
{ LowerFrontLeft, { 0.176776695f, 0.072168784f, 0.072168784f, -0.072168784f } },
{ LowerFrontRight, { 0.176776695f, 0.072168784f, -0.072168784f, -0.072168784f } },
{ LowerBackLeft, { 0.176776695f, -0.072168784f, 0.072168784f, -0.072168784f } },
{ LowerBackRight, { 0.176776695f, -0.072168784f, -0.072168784f, -0.072168784f } },
};
static const struct {
enum Channel Channel;
ALfloat Angle;
ALfloat Elevation;
} CubeInfo[8] = {
{ UpperFrontLeft, DEG2RAD( -45.0f), DEG2RAD( 45.0f) },
{ UpperFrontRight, DEG2RAD( 45.0f), DEG2RAD( 45.0f) },
{ UpperBackLeft, DEG2RAD(-135.0f), DEG2RAD( 45.0f) },
{ UpperBackRight, DEG2RAD( 135.0f), DEG2RAD( 45.0f) },
{ LowerFrontLeft, DEG2RAD( -45.0f), DEG2RAD(-45.0f) },
{ LowerFrontRight, DEG2RAD( 45.0f), DEG2RAD(-45.0f) },
{ LowerBackLeft, DEG2RAD(-135.0f), DEG2RAD(-45.0f) },
{ LowerBackRight, DEG2RAD( 135.0f), DEG2RAD(-45.0f) },
};
const ChannelMap *chanmap = Cube8Cfg;
size_t count = COUNTOF(Cube8Cfg);
ALuint i;
SetChannelMap(CubeChannels, device->Dry.Ambi.Coeffs, chanmap, count,
&device->Dry.NumChannels, AL_TRUE);
device->Dry.CoeffCount = 4;
memcpy(&device->FOAOut.Ambi, &device->Dry.Ambi, sizeof(device->FOAOut.Ambi));
device->FOAOut.CoeffCount = device->Dry.CoeffCount;
for(i = 0;i < device->Dry.NumChannels;i++)
{
int chan = GetChannelIndex(CubeChannels, CubeInfo[i].Channel);
GetLerpedHrtfCoeffs(device->Hrtf, CubeInfo[i].Elevation, CubeInfo[i].Angle, 1.0f, 0.0f,
device->Hrtf_Params[chan].Coeffs, device->Hrtf_Params[chan].Delay);
}
}
// Begin displaying video from the specified stream
bool MHIContext::BeginVideo(const QString &stream, int tag)
{
LOG(VB_MHEG, LOG_INFO, QString("[mhi] BeginVideo %1 %2").arg(stream).arg(tag));
int chan = GetChannelIndex(stream);
if (chan < 0)
return false;
if (chan != m_currentStream)
{
// We have to tune to the channel where the video is to be found.
m_currentStream = chan;
m_videoTag = tag;
return TuneTo(chan, kTuneKeepChnl|kTuneQuietly|kTuneKeepApp);
}
if (tag < 0)
return true; // Leave it at the default.
else if (m_parent->GetNVP())
return m_parent->GetNVP()->SetVideoByComponentTag(tag);
return false;
}