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audiooutputalsa.cpp
1013 lines (872 loc) · 32 KB
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audiooutputalsa.cpp
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#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <sys/time.h>
#include <QFile>
#include "libmythbase/mythcorecontext.h"
#include "audiooutputalsa.h"
#define LOC QString("ALSA: ")
// redefine assert as no-op to quiet some compiler warnings
// about assert always evaluating true in alsa headers.
#undef assert
#define assert(x)
#define CHANNELS_MIN 1
#define CHANNELS_MAX 8
#define OPEN_FLAGS (SND_PCM_NO_AUTO_RESAMPLE|SND_PCM_NO_AUTO_FORMAT| \
SND_PCM_NO_AUTO_CHANNELS)
#define FILTER_FLAGS ~(SND_PCM_NO_AUTO_FORMAT)
#define AERROR(str) VBERROR((str) + QString(": %1").arg(snd_strerror(err)))
#define CHECKERR(str) { if (err < 0) { AERROR(str); return err; } }
AudioOutputALSA::AudioOutputALSA(const AudioSettings &settings) :
AudioOutputBase(settings)
{
// Set everything up
if (m_passthruDevice == "auto")
{
m_passthruDevice = m_mainDevice;
int len = m_passthruDevice.length();
int args = m_passthruDevice.indexOf(":");
/*
* AES description:
* AES0=6 AES1=0x82 AES2=0x00 AES3=0x01.
* AES0 = NON_AUDIO | PRO_MODE
* AES1 = original stream, original PCM coder
* AES2 = source and channel unspecified
* AES3 = sample rate unspecified
*/
bool s48k = gCoreContext->GetBoolSetting("SPDIFRateOverride", false);
QString iecarg = QString("AES0=6,AES1=0x82,AES2=0x00") +
(s48k ? QString() : QString(",AES3=0x01"));
QString iecarg2 = QString("AES0=6 AES1=0x82 AES2=0x00") +
(s48k ? QString() : QString(" AES3=0x01"));
if (args < 0)
{
/* no existing parameters: add it behind device name */
m_passthruDevice += ":" + iecarg;
}
else
{
do
++args;
while (args < m_passthruDevice.length() &&
m_passthruDevice[args].isSpace());
if (args == m_passthruDevice.length())
{
/* ":" but no parameters */
m_passthruDevice += iecarg;
}
else if (m_passthruDevice[args] != '{')
{
/* a simple list of parameters: add it at the end of the list */
m_passthruDevice += "," + iecarg;
}
else
{
/* parameters in config syntax: add it inside the { } block */
do
--len;
while (len > 0 && m_passthruDevice[len].isSpace());
if (m_passthruDevice[len] == '}')
m_passthruDevice =
m_passthruDevice.insert(len, " " + iecarg2);
}
}
}
else if (m_passthruDevice.toLower() == "default")
m_passthruDevice = m_mainDevice;
else
m_discreteDigital = true;
InitSettings(settings);
if (settings.m_init)
Reconfigure(settings);
}
AudioOutputALSA::~AudioOutputALSA()
{
KillAudio();
}
int AudioOutputALSA::TryOpenDevice(int open_mode, bool try_ac3)
{
QByteArray dev_ba;
int err = -1;
if (try_ac3)
{
dev_ba = m_passthruDevice.toLatin1();
VBAUDIO(QString("OpenDevice %1 for passthrough").arg(m_passthruDevice));
err = snd_pcm_open(&m_pcmHandle, dev_ba.constData(),
SND_PCM_STREAM_PLAYBACK, open_mode);
m_lastDevice = m_passthruDevice;
if (m_discreteDigital)
return err;
if (err < 0)
{
VBAUDIO(QString("Auto setting passthrough failed (%1), defaulting "
"to main device").arg(snd_strerror(err)));
}
}
if (!try_ac3 || err < 0)
{
// passthru open failed, retry default device
VBAUDIO(QString("OpenDevice %1").arg(m_mainDevice));
dev_ba = m_mainDevice.toLatin1();
err = snd_pcm_open(&m_pcmHandle, dev_ba.constData(),
SND_PCM_STREAM_PLAYBACK, open_mode);
m_lastDevice = m_mainDevice;
}
return err;
}
int AudioOutputALSA::GetPCMInfo(int &card, int &device, int &subdevice)
{
// Check for saved values
if (m_card != -1 && m_device != -1 && m_subdevice != -1)
{
card = m_card;
device = m_device;
subdevice = m_subdevice;
return 0;
}
if (!m_pcmHandle)
return -1;
snd_pcm_info_t *pcm_info = nullptr;
snd_pcm_info_alloca(&pcm_info);
int err = snd_pcm_info(m_pcmHandle, pcm_info);
CHECKERR("snd_pcm_info");
err = snd_pcm_info_get_card(pcm_info);
CHECKERR("snd_pcm_info_get_card");
int tcard = err;
err = snd_pcm_info_get_device(pcm_info);
CHECKERR("snd_pcm_info_get_device");
int tdevice = err;
err = snd_pcm_info_get_subdevice(pcm_info);
CHECKERR("snd_pcm_info_get_subdevice");
int tsubdevice = err;
m_card = card = tcard;
m_device = device = tdevice;
m_subdevice = subdevice = tsubdevice;
return 0;
}
bool AudioOutputALSA::IncPreallocBufferSize(int requested, int buffer_time)
{
int card = 0;
int device = 0;
int subdevice = 0;
m_pbufSize = 0;
if (GetPCMInfo(card, device, subdevice) < 0)
return false;
const QString pf = QString("/proc/asound/card%1/pcm%2p/sub%3/prealloc")
.arg(card).arg(device).arg(subdevice);
QFile pfile(pf);
QFile mfile(pf + "_max");
if (!pfile.open(QIODevice::ReadOnly))
{
VBERROR(QString("Error opening %1. Fix reading permissions.").arg(pf));
return false;
}
if (!mfile.open(QIODevice::ReadOnly))
{
VBERROR(QString("Error opening %1").arg(pf + "_max"));
return false;
}
int cur = pfile.readAll().trimmed().toInt();
int max = mfile.readAll().trimmed().toInt();
int size = ((int)(cur * (float)requested / (float)buffer_time)
/ 64 + 1) * 64;
VBAUDIO(QString("Hardware audio buffer cur: %1 need: %2 max allowed: %3")
.arg(cur).arg(size).arg(max));
if (cur == max)
{
// It's already the maximum it can be, no point trying further
pfile.close();
mfile.close();
return false;
}
if (size > max || !size)
{
size = max;
}
pfile.close();
mfile.close();
VBWARN(QString("Try to manually increase audio buffer with: echo %1 "
"| sudo tee %2").arg(size).arg(pf));
return false;
}
QByteArray *AudioOutputALSA::GetELD(int card, int device, int subdevice)
{
QByteArray *result = nullptr;
snd_hctl_t *hctl = nullptr;
snd_ctl_elem_info_t *info = nullptr;
snd_ctl_elem_id_t *id = nullptr;
snd_ctl_elem_value_t *control = nullptr;
snd_ctl_elem_info_alloca(&info);
snd_ctl_elem_id_alloca(&id);
snd_ctl_elem_value_alloca(&control);
snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_PCM);
snd_ctl_elem_id_set_name(id, "ELD");
snd_ctl_elem_id_set_device(id, device);
snd_ctl_elem_id_set_subdevice(id, subdevice);
int err = snd_hctl_open(&hctl,
QString("hw:%1").arg(card).toLatin1().constData(),
0);
if (err < 0)
{
VBAUDIO(QString("Control %1 open error: %2")
.arg(card)
.arg(snd_strerror(err)));
return nullptr;
}
if ((err = snd_hctl_load(hctl)) < 0)
{
VBAUDIO(QString("Control %1 load error: %2")
.arg(card)
.arg(snd_strerror(err)));
/* frees automatically the control which cannot be added. */
return nullptr;
}
snd_hctl_elem_t *elem = snd_hctl_find_elem(hctl, id);
if (elem)
{
err = snd_hctl_elem_info(elem, info);
if (err < 0)
{
VBAUDIO(QString("Control %1 snd_hctl_elem_info error: %2")
.arg(card)
.arg(snd_strerror(err)));
snd_hctl_close(hctl);
return nullptr;
}
unsigned int count = snd_ctl_elem_info_get_count(info);
snd_ctl_elem_type_t type = snd_ctl_elem_info_get_type(info);
if (!snd_ctl_elem_info_is_readable(info))
{
VBAUDIO(QString("Control %1 element info is not readable")
.arg(card));
snd_hctl_close(hctl);
return nullptr;
}
if ((err = snd_hctl_elem_read(elem, control)) < 0)
{
VBAUDIO(QString("Control %1 element read error: %2")
.arg(card)
.arg(snd_strerror(err)));
snd_hctl_close(hctl);
return nullptr;
}
if (type != SND_CTL_ELEM_TYPE_BYTES)
{
VBAUDIO(QString("Control %1 element is of the wrong type")
.arg(card));
snd_hctl_close(hctl);
return nullptr;
}
result = new QByteArray((char *)snd_ctl_elem_value_get_bytes(control),
count);
}
snd_hctl_close(hctl);
return result;
}
AudioOutputSettings* AudioOutputALSA::GetOutputSettings(bool passthrough)
{
snd_pcm_hw_params_t *params = nullptr;
snd_pcm_format_t afmt = SND_PCM_FORMAT_UNKNOWN;
AudioFormat fmt = FORMAT_NONE;
int err = 0;
auto *settings = new AudioOutputSettings();
if (m_pcmHandle)
{
snd_pcm_close(m_pcmHandle);
m_pcmHandle = nullptr;
}
if ((err = TryOpenDevice(OPEN_FLAGS, passthrough)) < 0)
{
AERROR(QString("snd_pcm_open(\"%1\")").arg(m_lastDevice));
delete settings;
return nullptr;
}
snd_pcm_hw_params_alloca(¶ms);
if (snd_pcm_hw_params_any(m_pcmHandle, params) < 0)
{
snd_pcm_close(m_pcmHandle);
if ((err = TryOpenDevice(OPEN_FLAGS&FILTER_FLAGS, passthrough)) < 0)
{
AERROR(QString("snd_pcm_open(\"%1\")").arg(m_lastDevice));
delete settings;
return nullptr;
}
if ((err = snd_pcm_hw_params_any(m_pcmHandle, params)) < 0)
{
AERROR("No playback configurations available");
snd_pcm_close(m_pcmHandle);
m_pcmHandle = nullptr;
delete settings;
return nullptr;
}
Warn("Supported audio format detection will be inacurrate "
"(using plugin?)");
}
// NOLINTNEXTLINE(bugprone-infinite-loop)
while (int rate = settings->GetNextRate())
if(snd_pcm_hw_params_test_rate(m_pcmHandle, params, rate, 0) >= 0)
settings->AddSupportedRate(rate);
while ((fmt = settings->GetNextFormat()))
{
switch (fmt)
{
case FORMAT_U8: afmt = SND_PCM_FORMAT_U8; break;
case FORMAT_S16: afmt = SND_PCM_FORMAT_S16; break;
// NOLINTNEXTLINE(bugprone-branch-clone)
case FORMAT_S24LSB: afmt = SND_PCM_FORMAT_S24; break;
case FORMAT_S24: afmt = SND_PCM_FORMAT_S24; break;
case FORMAT_S32: afmt = SND_PCM_FORMAT_S32; break;
case FORMAT_FLT: afmt = SND_PCM_FORMAT_FLOAT; break;
default: continue;
}
if (snd_pcm_hw_params_test_format(m_pcmHandle, params, afmt) >= 0)
settings->AddSupportedFormat(fmt);
}
for (uint channels = CHANNELS_MIN; channels <= CHANNELS_MAX; channels++)
if (snd_pcm_hw_params_test_channels(m_pcmHandle, params, channels) >= 0)
settings->AddSupportedChannels(channels);
int card = 0;
int device = 0;
int subdevice = 0;
if (GetPCMInfo(card, device, subdevice) >= 0)
{
// Check if we can retrieve ELD for this device
QByteArray *eld = GetELD(card, device, subdevice);
if (eld != nullptr)
{
VBAUDIO(QString("Successfully retrieved ELD data"));
settings->setELD(eld);
delete eld;
}
}
else
{
VBAUDIO("Can't get card and device number");
}
snd_pcm_close(m_pcmHandle);
m_pcmHandle = nullptr;
/* Check if name or description contains information
to know if device can accept passthrough or not */
QMap<QString, QString> *alsadevs = GetDevices("pcm");
while (true)
{
QString real_device = ((passthrough && m_discreteDigital) ?
m_passthruDevice : m_mainDevice);
QString desc = alsadevs->value(real_device);
settings->setPassthrough(1); // yes passthrough
if (real_device.contains("digital", Qt::CaseInsensitive) ||
desc.contains("digital", Qt::CaseInsensitive))
break;
if (real_device.contains("iec958", Qt::CaseInsensitive))
break;
if (real_device.contains("spdif", Qt::CaseInsensitive))
break;
if (real_device.contains("hdmi", Qt::CaseInsensitive))
break;
settings->setPassthrough(-1); // no passthrough
// PulseAudio does not support passthrough
if (real_device.contains("pulse", Qt::CaseInsensitive) ||
desc.contains("pulse", Qt::CaseInsensitive))
break;
if (real_device.contains("analog", Qt::CaseInsensitive) ||
desc.contains("analog", Qt::CaseInsensitive))
break;
if (real_device.contains("surround", Qt::CaseInsensitive) ||
desc.contains("surround", Qt::CaseInsensitive))
break;
settings->setPassthrough(0); // maybe passthrough
break;
}
delete alsadevs;
return settings;
}
bool AudioOutputALSA::OpenDevice()
{
snd_pcm_format_t format = SND_PCM_FORMAT_UNKNOWN;
int err = 0;
if (m_pcmHandle != nullptr)
CloseDevice();
if ((err = TryOpenDevice(0, m_passthru || m_enc)) < 0)
{
AERROR(QString("snd_pcm_open(\"%1\")").arg(m_lastDevice));
if (m_pcmHandle)
CloseDevice();
return false;
}
switch (m_outputFormat)
{
case FORMAT_U8: format = SND_PCM_FORMAT_U8; break;
case FORMAT_S16: format = SND_PCM_FORMAT_S16; break;
// NOLINTNEXTLINE(bugprone-branch-clone)
case FORMAT_S24LSB: format = SND_PCM_FORMAT_S24; break;
case FORMAT_S24: format = SND_PCM_FORMAT_S24; break;
case FORMAT_S32: format = SND_PCM_FORMAT_S32; break;
case FORMAT_FLT: format = SND_PCM_FORMAT_FLOAT; break;
default:
Error(QObject::tr("Unknown sample format: %1").arg(m_outputFormat));
return false;
}
// buffer 0.5s worth of samples
uint buffer_time = gCoreContext->GetNumSetting("ALSABufferOverride", 500) * 1000;
uint period_time = 4; // aim for an interrupt every (1/4th of buffer_time)
err = SetParameters(m_pcmHandle, format, m_channels, m_sampleRate,
buffer_time, period_time);
if (err < 0)
{
AERROR("Unable to set ALSA parameters");
CloseDevice();
return false;
}
if (m_internalVol && !OpenMixer())
VBERROR("Unable to open audio mixer. Volume control disabled");
// Device opened successfully
return true;
}
void AudioOutputALSA::CloseDevice()
{
if (m_mixer.handle)
snd_mixer_close(m_mixer.handle);
m_mixer.handle = nullptr;
if (m_pcmHandle)
{
snd_pcm_drain(m_pcmHandle);
snd_pcm_close(m_pcmHandle);
m_pcmHandle = nullptr;
}
}
template <class AudioDataType>
static inline void tReorderSmpteToAlsa(AudioDataType *buf, uint frames,
uint extrach)
{
AudioDataType tmpC;
AudioDataType tmpLFE;
AudioDataType *buf2 = nullptr;
for (uint i = 0; i < frames; i++)
{
buf = buf2 = buf + 2;
tmpC = *buf++;
tmpLFE = *buf++;
*buf2++ = *buf++;
*buf2++ = *buf++;
*buf2++ = tmpC;
*buf2++ = tmpLFE;
buf += extrach;
}
}
static inline void ReorderSmpteToAlsa(void *buf, uint frames,
AudioFormat format, uint extrach)
{
switch(AudioOutputSettings::FormatToBits(format))
{
case 8: tReorderSmpteToAlsa((uchar *)buf, frames, extrach); break;
case 16: tReorderSmpteToAlsa((short *)buf, frames, extrach); break;
default: tReorderSmpteToAlsa((int *)buf, frames, extrach); break;
}
}
void AudioOutputALSA::WriteAudio(uchar *aubuf, int size)
{
uchar *tmpbuf = aubuf;
uint frames = size / m_outputBytesPerFrame;
if (m_pcmHandle == nullptr)
{
Error("WriteAudio() called with pcm_handle == nullptr!");
return;
}
//Audio received is in SMPTE channel order, reorder to ALSA unless passthru
if (!m_passthru && (m_channels == 6 || m_channels == 8))
{
ReorderSmpteToAlsa(aubuf, frames, m_outputFormat, m_channels - 6);
}
LOG(VB_AUDIO | VB_TIMESTAMP, LOG_INFO,
QString("WriteAudio: Preparing %1 bytes (%2 frames)")
.arg(size).arg(frames));
while (frames > 0)
{
int lw = snd_pcm_writei(m_pcmHandle, tmpbuf, frames);
if (lw >= 0)
{
if ((uint)lw < frames)
VBAUDIO(QString("WriteAudio: short write %1 bytes (ok)")
.arg(lw * m_outputBytesPerFrame));
frames -= lw;
tmpbuf += lw * m_outputBytesPerFrame; // bytes
continue;
}
int err = lw;
switch (err)
{
case -EPIPE:
if (snd_pcm_state(m_pcmHandle) == SND_PCM_STATE_XRUN)
{
VBAUDIO("WriteAudio: buffer underrun");
if ((err = snd_pcm_prepare(m_pcmHandle)) < 0)
{
AERROR("WriteAudio: unable to recover from xrun");
return;
}
}
break;
#if ESTRPIPE != EPIPE
case -ESTRPIPE:
VBAUDIO("WriteAudio: device is suspended");
while ((err = snd_pcm_resume(m_pcmHandle)) == -EAGAIN)
usleep(200us);
if (err < 0)
{
VBERROR("WriteAudio: resume failed");
if ((err = snd_pcm_prepare(m_pcmHandle)) < 0)
{
AERROR("WriteAudio: unable to recover from suspend");
return;
}
}
break;
#endif
case -EBADFD:
Error(
QString("WriteAudio: device is in a bad state (state = %1)")
.arg(snd_pcm_state(m_pcmHandle)));
return;
default:
AERROR(QString("WriteAudio: Write failed, state: %1, err")
.arg(snd_pcm_state(m_pcmHandle)));
return;
}
}
}
int AudioOutputALSA::GetBufferedOnSoundcard(void) const
{
if (m_pcmHandle == nullptr)
{
VBERROR("getBufferedOnSoundcard() called with pcm_handle == nullptr!");
return 0;
}
snd_pcm_sframes_t delay = 0;
/* Delay is the total delay from writing to the pcm until the samples
hit the DAC - includes buffered samples and any fixed latencies */
if (snd_pcm_delay(m_pcmHandle, &delay) < 0)
return 0;
// BUG: calling snd_pcm_state causes noise and repeats on the Raspberry Pi
return delay * m_outputBytesPerFrame;
}
/**
* Set the various ALSA audio parameters.
* Returns:
* < 0 : an error occurred
* 0 : Succeeded
* > 0 : Buffer timelength returned by ALSA which is less than what we asked for
*/
int AudioOutputALSA::SetParameters(snd_pcm_t *handle, snd_pcm_format_t format,
uint channels, uint rate, uint buffer_time,
uint period_time)
{
snd_pcm_hw_params_t *params = nullptr;
snd_pcm_sw_params_t *swparams = nullptr;
snd_pcm_uframes_t period_size = 0;
snd_pcm_uframes_t period_size_min = 0;
snd_pcm_uframes_t period_size_max = 0;
snd_pcm_uframes_t buffer_size = 0;
snd_pcm_uframes_t buffer_size_min = 0;
snd_pcm_uframes_t buffer_size_max = 0;
VBAUDIO(QString("SetParameters(format=%1, channels=%2, rate=%3, "
"buffer_time=%4, period_time=%5)")
.arg(format).arg(channels).arg(rate).arg(buffer_time)
.arg(period_time));
if (handle == nullptr)
{
Error(QObject::tr("SetParameters() called with handle == nullptr!"));
return -1;
}
snd_pcm_hw_params_alloca(¶ms);
snd_pcm_sw_params_alloca(&swparams);
/* choose all parameters */
int err = snd_pcm_hw_params_any(handle, params);
CHECKERR("No playback configurations available");
/* set the interleaved read/write format */
err = snd_pcm_hw_params_set_access(handle, params,
SND_PCM_ACCESS_RW_INTERLEAVED);
CHECKERR(QString("Interleaved RW audio not available"));
/* set the sample format */
err = snd_pcm_hw_params_set_format(handle, params, format);
CHECKERR(QString("Sample format %1 not available").arg(format));
/* set the count of channels */
err = snd_pcm_hw_params_set_channels(handle, params, channels);
CHECKERR(QString("Channels count %1 not available").arg(channels));
/* set the stream rate */
if (m_srcQuality == QUALITY_DISABLED)
{
err = snd_pcm_hw_params_set_rate_resample(handle, params, 1);
CHECKERR(QString("Resampling setup failed").arg(rate));
uint rrate = rate;
err = snd_pcm_hw_params_set_rate_near(handle, params, &rrate, nullptr);
CHECKERR(QString("Rate %1Hz not available for playback: %s").arg(rate));
if (rrate != rate)
{
VBERROR(QString("Rate doesn't match (requested %1Hz, got %2Hz)")
.arg(rate).arg(err));
return err;
}
}
else
{
err = snd_pcm_hw_params_set_rate(handle, params, rate, 0);
CHECKERR(QString("Samplerate %1 Hz not available").arg(rate));
}
/* get the buffer parameters */
(void) snd_pcm_hw_params_get_buffer_size_min(params, &buffer_size_min);
(void) snd_pcm_hw_params_get_buffer_size_max(params, &buffer_size_max);
(void) snd_pcm_hw_params_get_period_size_min(params, &period_size_min, nullptr);
(void) snd_pcm_hw_params_get_period_size_max(params, &period_size_max, nullptr);
VBAUDIO(QString("Buffer size range from %1 to %2")
.arg(buffer_size_min)
.arg(buffer_size_max));
VBAUDIO(QString("Period size range from %1 to %2")
.arg(period_size_min)
.arg(period_size_max));
/* set the buffer time */
uint original_buffer_time = buffer_time;
bool canincrease = true;
err = snd_pcm_hw_params_set_buffer_time_near(handle, params,
&buffer_time, nullptr);
if (err < 0)
{
int dir = -1;
uint buftmp = buffer_time;
int attempt = 0;
do
{
err = snd_pcm_hw_params_set_buffer_time_near(handle, params,
&buffer_time, &dir);
if (err < 0)
{
AERROR(QString("Unable to set buffer time to %1us, retrying")
.arg(buffer_time));
/*
* with some drivers, snd_pcm_hw_params_set_buffer_time_near
* only works once, if that's the case no point trying with
* different values
*/
if ((buffer_time <= 100000) ||
(attempt > 0 && buffer_time == buftmp))
{
VBERROR("Couldn't set buffer time, giving up");
return err;
}
buffer_time -= 100000;
canincrease = false;
attempt++;
}
}
while (err < 0);
}
/* See if we need to increase the prealloc'd buffer size
If buffer_time is too small we could underrun - make 10% difference ok */
if (buffer_time * 1.10F < (float)original_buffer_time)
{
VBWARN(QString("Requested %1us got %2 buffer time")
.arg(original_buffer_time).arg(buffer_time));
// We need to increase preallocated buffer size in the driver
if (canincrease && m_pbufSize < 0)
{
IncPreallocBufferSize(original_buffer_time, buffer_time);
}
}
VBAUDIO(QString("Buffer time = %1 us").arg(buffer_time));
/* set the period time */
err = snd_pcm_hw_params_set_periods_near(handle, params,
&period_time, nullptr);
CHECKERR(QString("Unable to set period time %1").arg(period_time));
VBAUDIO(QString("Period time = %1 periods").arg(period_time));
/* write the parameters to device */
err = snd_pcm_hw_params(handle, params);
CHECKERR("Unable to set hw params for playback");
err = snd_pcm_get_params(handle, &buffer_size, &period_size);
CHECKERR("Unable to get PCM params");
VBAUDIO(QString("Buffer size = %1 | Period size = %2")
.arg(buffer_size).arg(period_size));
/* set member variables */
m_soundcardBufferSize = buffer_size * m_outputBytesPerFrame;
m_fragmentSize = (period_size >> 1) * m_outputBytesPerFrame;
/* get the current swparams */
err = snd_pcm_sw_params_current(handle, swparams);
CHECKERR("Unable to get current swparams");
/* start the transfer after period_size */
err = snd_pcm_sw_params_set_start_threshold(handle, swparams, period_size);
CHECKERR("Unable to set start threshold");
/* allow the transfer when at least period_size samples can be processed */
err = snd_pcm_sw_params_set_avail_min(handle, swparams, period_size);
CHECKERR("Unable to set avail min");
/* write the parameters to the playback device */
err = snd_pcm_sw_params(handle, swparams);
CHECKERR("Unable to set sw params");
err = snd_pcm_prepare(handle);
CHECKERR("Unable to prepare the PCM");
return 0;
}
int AudioOutputALSA::GetVolumeChannel(int channel) const
{
int retvol = 0;
if (!m_mixer.elem)
return retvol;
auto chan = (snd_mixer_selem_channel_id_t) channel;
if (!snd_mixer_selem_has_playback_channel(m_mixer.elem, chan))
return retvol;
long mixervol = 0;
int chk = snd_mixer_selem_get_playback_volume(m_mixer.elem, chan,
&mixervol);
if (chk < 0)
{
VBERROR(QString("failed to get channel %1 volume, mixer %2/%3: %4")
.arg(QString::number(channel), m_mixer.device,
m_mixer.control, snd_strerror(chk)));
}
else
{
retvol = (m_mixer.volrange != 0L) ? (mixervol - m_mixer.volmin) *
100.0F / m_mixer.volrange + 0.5F
: 0;
retvol = std::max(retvol, 0);
retvol = std::min(retvol, 100);
VBAUDIO(QString("get volume channel %1: %2")
.arg(channel).arg(retvol));
}
return retvol;
}
void AudioOutputALSA::SetVolumeChannel(int channel, int volume)
{
if (!(m_internalVol && m_mixer.elem))
return;
long mixervol = (int64_t(volume) * m_mixer.volrange) / 100 + m_mixer.volmin;
mixervol = std::max(mixervol, m_mixer.volmin);
mixervol = std::min(mixervol, m_mixer.volmax);
auto chan = (snd_mixer_selem_channel_id_t) channel;
if (snd_mixer_selem_has_playback_switch(m_mixer.elem))
snd_mixer_selem_set_playback_switch(m_mixer.elem, chan, static_cast<int>(volume > 0));
if (snd_mixer_selem_set_playback_volume(m_mixer.elem, chan, mixervol) < 0)
VBERROR(QString("failed to set channel %1 volume").arg(channel));
else
VBAUDIO(QString("channel %1 volume set %2 => %3")
.arg(channel).arg(volume).arg(mixervol));
}
bool AudioOutputALSA::OpenMixer(void)
{
if (!m_pcmHandle)
{
VBERROR("mixer setup without a pcm");
return false;
}
m_mixer.device = gCoreContext->GetSetting("MixerDevice", "default");
m_mixer.device = m_mixer.device.remove(QString("ALSA:"));
if (m_mixer.device.toLower() == "software")
return true;
m_mixer.control = gCoreContext->GetSetting("MixerControl", "PCM");
QString mixer_device_tag = QString("mixer device %1").arg(m_mixer.device);
int chk = snd_mixer_open(&m_mixer.handle, 0);
if (chk < 0)
{
VBERROR(QString("failed to open mixer device %1: %2")
.arg(mixer_device_tag, snd_strerror(chk)));
return false;
}
QByteArray dev_ba = m_mixer.device.toLatin1();
struct snd_mixer_selem_regopt regopts =
{1, SND_MIXER_SABSTRACT_NONE, dev_ba.constData(), nullptr, nullptr};
if ((chk = snd_mixer_selem_register(m_mixer.handle, ®opts, nullptr)) < 0)
{
snd_mixer_close(m_mixer.handle);
m_mixer.handle = nullptr;
VBERROR(QString("failed to register %1: %2")
.arg(mixer_device_tag, snd_strerror(chk)));
return false;
}
if ((chk = snd_mixer_load(m_mixer.handle)) < 0)
{
snd_mixer_close(m_mixer.handle);
m_mixer.handle = nullptr;
VBERROR(QString("failed to load %1: %2")
.arg(mixer_device_tag, snd_strerror(chk)));
return false;
}
m_mixer.elem = nullptr;
uint elcount = snd_mixer_get_count(m_mixer.handle);
snd_mixer_elem_t* elx = snd_mixer_first_elem(m_mixer.handle);
for (uint ctr = 0; elx != nullptr && ctr < elcount; ctr++)
{
QString tmp = QString(snd_mixer_selem_get_name(elx));
if (m_mixer.control == tmp &&
!snd_mixer_selem_is_enumerated(elx) &&
snd_mixer_selem_has_playback_volume(elx) &&
snd_mixer_selem_is_active(elx))
{
m_mixer.elem = elx;
VBAUDIO(QString("found playback control %1 on %2")
.arg(m_mixer.control, mixer_device_tag));
break;
}
elx = snd_mixer_elem_next(elx);
}
if (!m_mixer.elem)
{
snd_mixer_close(m_mixer.handle);
m_mixer.handle = nullptr;
VBERROR(QString("no playback control %1 found on %2")
.arg(m_mixer.control, mixer_device_tag));
return false;
}
if ((snd_mixer_selem_get_playback_volume_range(m_mixer.elem,
&m_mixer.volmin,
&m_mixer.volmax) < 0))
{
snd_mixer_close(m_mixer.handle);
m_mixer.handle = nullptr;
VBERROR(QString("failed to get volume range on %1/%2")
.arg(mixer_device_tag, m_mixer.control));
return false;
}
m_mixer.volrange = m_mixer.volmax - m_mixer.volmin;
VBAUDIO(QString("mixer volume range on %1/%2 - min %3, max %4, range %5")
.arg(mixer_device_tag, m_mixer.control)
.arg(m_mixer.volmin).arg(m_mixer.volmax).arg(m_mixer.volrange));
VBAUDIO(QString("%1/%2 set up successfully")
.arg(mixer_device_tag, m_mixer.control));
if (m_setInitialVol)
{
int initial_vol = 80;
if (m_mixer.control == "PCM")
initial_vol = gCoreContext->GetNumSetting("PCMMixerVolume", 80);
else
initial_vol = gCoreContext->GetNumSetting("MasterMixerVolume", 80);
for (int ch = 0; ch < m_channels; ++ch)
SetVolumeChannel(ch, initial_vol);
}
return true;
}
QMap<QString, QString> *AudioOutputALSA::GetDevices(const char *type)
{
auto *alsadevs = new QMap<QString, QString>();
void **hints = nullptr;
void **n = nullptr;
if (snd_device_name_hint(-1, type, &hints) < 0)
return alsadevs;
n = hints;
while (*n != nullptr)
{
QString name = snd_device_name_get_hint(*n, "NAME");
QString desc = snd_device_name_get_hint(*n, "DESC");
if (!name.isEmpty() && !desc.isEmpty() && (name != "null"))
alsadevs->insert(name, desc);
n++;