blob: 8bc63c3806f2f29cae493d3036be4a557b04ff9c [file] [log] [blame]
/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <assert.h>
#include "webrtc/modules/audio_device/linux/audio_mixer_manager_alsa_linux.h"
#include "webrtc/rtc_base/logging.h"
extern webrtc::adm_linux_alsa::AlsaSymbolTable AlsaSymbolTable;
// Accesses ALSA functions through our late-binding symbol table instead of
// directly. This way we don't have to link to libalsa, which means our binary
// will work on systems that don't have it.
#define LATE(sym) \
LATESYM_GET(webrtc::adm_linux_alsa::AlsaSymbolTable, &AlsaSymbolTable, sym)
namespace webrtc
{
AudioMixerManagerLinuxALSA::AudioMixerManagerLinuxALSA() :
_outputMixerHandle(NULL),
_inputMixerHandle(NULL),
_outputMixerElement(NULL),
_inputMixerElement(NULL)
{
LOG(LS_INFO) << __FUNCTION__ << " created";
memset(_outputMixerStr, 0, kAdmMaxDeviceNameSize);
memset(_inputMixerStr, 0, kAdmMaxDeviceNameSize);
}
AudioMixerManagerLinuxALSA::~AudioMixerManagerLinuxALSA()
{
LOG(LS_INFO) << __FUNCTION__ << " destroyed";
Close();
}
// ============================================================================
// PUBLIC METHODS
// ============================================================================
int32_t AudioMixerManagerLinuxALSA::Close()
{
LOG(LS_VERBOSE) << __FUNCTION__;
rtc::CritScope lock(&_critSect);
CloseSpeaker();
CloseMicrophone();
return 0;
}
int32_t AudioMixerManagerLinuxALSA::CloseSpeaker()
{
LOG(LS_VERBOSE) << __FUNCTION__;
rtc::CritScope lock(&_critSect);
int errVal = 0;
if (_outputMixerHandle != NULL)
{
LOG(LS_VERBOSE) << "Closing playout mixer";
LATE(snd_mixer_free)(_outputMixerHandle);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error freeing playout mixer: "
<< LATE(snd_strerror)(errVal);
}
errVal = LATE(snd_mixer_detach)(_outputMixerHandle, _outputMixerStr);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error detaching playout mixer: "
<< LATE(snd_strerror)(errVal);
}
errVal = LATE(snd_mixer_close)(_outputMixerHandle);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error snd_mixer_close(handleMixer) errVal="
<< errVal;
}
_outputMixerHandle = NULL;
_outputMixerElement = NULL;
}
memset(_outputMixerStr, 0, kAdmMaxDeviceNameSize);
return 0;
}
int32_t AudioMixerManagerLinuxALSA::CloseMicrophone()
{
LOG(LS_VERBOSE) << __FUNCTION__;
rtc::CritScope lock(&_critSect);
int errVal = 0;
if (_inputMixerHandle != NULL)
{
LOG(LS_VERBOSE) << "Closing record mixer";
LATE(snd_mixer_free)(_inputMixerHandle);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error freeing record mixer: "
<< LATE(snd_strerror)(errVal);
}
LOG(LS_VERBOSE) << "Closing record mixer 2";
errVal = LATE(snd_mixer_detach)(_inputMixerHandle, _inputMixerStr);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error detaching record mixer: "
<< LATE(snd_strerror)(errVal);
}
LOG(LS_VERBOSE) << "Closing record mixer 3";
errVal = LATE(snd_mixer_close)(_inputMixerHandle);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error snd_mixer_close(handleMixer) errVal="
<< errVal;
}
LOG(LS_VERBOSE) << "Closing record mixer 4";
_inputMixerHandle = NULL;
_inputMixerElement = NULL;
}
memset(_inputMixerStr, 0, kAdmMaxDeviceNameSize);
return 0;
}
int32_t AudioMixerManagerLinuxALSA::OpenSpeaker(char* deviceName)
{
LOG(LS_VERBOSE) << "AudioMixerManagerLinuxALSA::OpenSpeaker(name="
<< deviceName << ")";
rtc::CritScope lock(&_critSect);
int errVal = 0;
// Close any existing output mixer handle
//
if (_outputMixerHandle != NULL)
{
LOG(LS_VERBOSE) << "Closing playout mixer";
LATE(snd_mixer_free)(_outputMixerHandle);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error freeing playout mixer: "
<< LATE(snd_strerror)(errVal);
}
errVal = LATE(snd_mixer_detach)(_outputMixerHandle, _outputMixerStr);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error detaching playout mixer: "
<< LATE(snd_strerror)(errVal);
}
errVal = LATE(snd_mixer_close)(_outputMixerHandle);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error snd_mixer_close(handleMixer) errVal="
<< errVal;
}
}
_outputMixerHandle = NULL;
_outputMixerElement = NULL;
errVal = LATE(snd_mixer_open)(&_outputMixerHandle, 0);
if (errVal < 0)
{
LOG(LS_ERROR) << "snd_mixer_open(&_outputMixerHandle, 0) - error";
return -1;
}
char controlName[kAdmMaxDeviceNameSize] = { 0 };
GetControlName(controlName, deviceName);
LOG(LS_VERBOSE) << "snd_mixer_attach(_outputMixerHandle, " << controlName
<< ")";
errVal = LATE(snd_mixer_attach)(_outputMixerHandle, controlName);
if (errVal < 0)
{
LOG(LS_ERROR) << "snd_mixer_attach(_outputMixerHandle, " << controlName
<< ") error: " << LATE(snd_strerror)(errVal);
_outputMixerHandle = NULL;
return -1;
}
strcpy(_outputMixerStr, controlName);
errVal = LATE(snd_mixer_selem_register)(_outputMixerHandle, NULL, NULL);
if (errVal < 0)
{
LOG(LS_ERROR)
<< "snd_mixer_selem_register(_outputMixerHandle, NULL, NULL), "
<< "error: " << LATE(snd_strerror)(errVal);
_outputMixerHandle = NULL;
return -1;
}
// Load and find the proper mixer element
if (LoadSpeakerMixerElement() < 0)
{
return -1;
}
if (_outputMixerHandle != NULL)
{
LOG(LS_VERBOSE) << "the output mixer device is now open ("
<< _outputMixerHandle << ")";
}
return 0;
}
int32_t AudioMixerManagerLinuxALSA::OpenMicrophone(char *deviceName)
{
LOG(LS_VERBOSE) << "AudioMixerManagerLinuxALSA::OpenMicrophone(name="
<< deviceName << ")";
rtc::CritScope lock(&_critSect);
int errVal = 0;
// Close any existing input mixer handle
//
if (_inputMixerHandle != NULL)
{
LOG(LS_VERBOSE) << "Closing record mixer";
LATE(snd_mixer_free)(_inputMixerHandle);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error freeing record mixer: "
<< LATE(snd_strerror)(errVal);
}
LOG(LS_VERBOSE) << "Closing record mixer";
errVal = LATE(snd_mixer_detach)(_inputMixerHandle, _inputMixerStr);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error detaching record mixer: "
<< LATE(snd_strerror)(errVal);
}
LOG(LS_VERBOSE) << "Closing record mixer";
errVal = LATE(snd_mixer_close)(_inputMixerHandle);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error snd_mixer_close(handleMixer) errVal="
<< errVal;
}
LOG(LS_VERBOSE) << "Closing record mixer";
}
_inputMixerHandle = NULL;
_inputMixerElement = NULL;
errVal = LATE(snd_mixer_open)(&_inputMixerHandle, 0);
if (errVal < 0)
{
LOG(LS_ERROR) << "snd_mixer_open(&_inputMixerHandle, 0) - error";
return -1;
}
char controlName[kAdmMaxDeviceNameSize] = { 0 };
GetControlName(controlName, deviceName);
LOG(LS_VERBOSE) << "snd_mixer_attach(_inputMixerHandle, " << controlName
<< ")";
errVal = LATE(snd_mixer_attach)(_inputMixerHandle, controlName);
if (errVal < 0)
{
LOG(LS_ERROR) << "snd_mixer_attach(_inputMixerHandle, " << controlName
<< ") error: " << LATE(snd_strerror)(errVal);
_inputMixerHandle = NULL;
return -1;
}
strcpy(_inputMixerStr, controlName);
errVal = LATE(snd_mixer_selem_register)(_inputMixerHandle, NULL, NULL);
if (errVal < 0)
{
LOG(LS_ERROR)
<< "snd_mixer_selem_register(_inputMixerHandle, NULL, NULL), "
<< "error: " << LATE(snd_strerror)(errVal);
_inputMixerHandle = NULL;
return -1;
}
// Load and find the proper mixer element
if (LoadMicMixerElement() < 0)
{
return -1;
}
if (_inputMixerHandle != NULL)
{
LOG(LS_VERBOSE) << "the input mixer device is now open ("
<< _inputMixerHandle << ")";
}
return 0;
}
bool AudioMixerManagerLinuxALSA::SpeakerIsInitialized() const
{
LOG(LS_INFO) << __FUNCTION__;
return (_outputMixerHandle != NULL);
}
bool AudioMixerManagerLinuxALSA::MicrophoneIsInitialized() const
{
LOG(LS_INFO) << __FUNCTION__;
return (_inputMixerHandle != NULL);
}
int32_t AudioMixerManagerLinuxALSA::SetSpeakerVolume(
uint32_t volume)
{
LOG(LS_VERBOSE) << "AudioMixerManagerLinuxALSA::SetSpeakerVolume(volume="
<< volume << ")";
rtc::CritScope lock(&_critSect);
if (_outputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable output mixer element exists";
return -1;
}
int errVal =
LATE(snd_mixer_selem_set_playback_volume_all)(_outputMixerElement,
volume);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error changing master volume: "
<< LATE(snd_strerror)(errVal);
return -1;
}
return (0);
}
int32_t AudioMixerManagerLinuxALSA::SpeakerVolume(
uint32_t& volume) const
{
if (_outputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable output mixer element exists";
return -1;
}
long int vol(0);
int
errVal = LATE(snd_mixer_selem_get_playback_volume)(
_outputMixerElement,
(snd_mixer_selem_channel_id_t) 0,
&vol);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error getting outputvolume: "
<< LATE(snd_strerror)(errVal);
return -1;
}
LOG(LS_VERBOSE) << "AudioMixerManagerLinuxALSA::SpeakerVolume() => vol="
<< vol;
volume = static_cast<uint32_t> (vol);
return 0;
}
int32_t AudioMixerManagerLinuxALSA::MaxSpeakerVolume(
uint32_t& maxVolume) const
{
if (_outputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avilable output mixer element exists";
return -1;
}
long int minVol(0);
long int maxVol(0);
int errVal =
LATE(snd_mixer_selem_get_playback_volume_range)(_outputMixerElement,
&minVol, &maxVol);
LOG(LS_VERBOSE) << "Playout hardware volume range, min: " << minVol
<< ", max: " << maxVol;
if (maxVol <= minVol)
{
LOG(LS_ERROR) << "Error getting get_playback_volume_range: "
<< LATE(snd_strerror)(errVal);
}
maxVolume = static_cast<uint32_t> (maxVol);
return 0;
}
int32_t AudioMixerManagerLinuxALSA::MinSpeakerVolume(
uint32_t& minVolume) const
{
if (_outputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable output mixer element exists";
return -1;
}
long int minVol(0);
long int maxVol(0);
int errVal =
LATE(snd_mixer_selem_get_playback_volume_range)(_outputMixerElement,
&minVol, &maxVol);
LOG(LS_VERBOSE) << "Playout hardware volume range, min: " << minVol
<< ", max: " << maxVol;
if (maxVol <= minVol)
{
LOG(LS_ERROR) << "Error getting get_playback_volume_range: "
<< LATE(snd_strerror)(errVal);
}
minVolume = static_cast<uint32_t> (minVol);
return 0;
}
// TL: Have done testnig with these but they don't seem reliable and
// they were therefore not added
/*
// ----------------------------------------------------------------------------
// SetMaxSpeakerVolume
// ----------------------------------------------------------------------------
int32_t AudioMixerManagerLinuxALSA::SetMaxSpeakerVolume(
uint32_t maxVolume)
{
if (_outputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable output mixer element exists";
return -1;
}
long int minVol(0);
long int maxVol(0);
int errVal = snd_mixer_selem_get_playback_volume_range(
_outputMixerElement, &minVol, &maxVol);
if ((maxVol <= minVol) || (errVal != 0))
{
LOG(LS_WARNING) << "Error getting playback volume range: "
<< snd_strerror(errVal);
}
maxVol = maxVolume;
errVal = snd_mixer_selem_set_playback_volume_range(
_outputMixerElement, minVol, maxVol);
LOG(LS_VERBOSE) << "Playout hardware volume range, min: " << minVol
<< ", max: " << maxVol;
if (errVal != 0)
{
LOG(LS_ERROR) << "Error setting playback volume range: "
<< snd_strerror(errVal);
return -1;
}
return 0;
}
// ----------------------------------------------------------------------------
// SetMinSpeakerVolume
// ----------------------------------------------------------------------------
int32_t AudioMixerManagerLinuxALSA::SetMinSpeakerVolume(
uint32_t minVolume)
{
if (_outputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable output mixer element exists";
return -1;
}
long int minVol(0);
long int maxVol(0);
int errVal = snd_mixer_selem_get_playback_volume_range(
_outputMixerElement, &minVol, &maxVol);
if ((maxVol <= minVol) || (errVal != 0))
{
LOG(LS_WARNING) << "Error getting playback volume range: "
<< snd_strerror(errVal);
}
minVol = minVolume;
errVal = snd_mixer_selem_set_playback_volume_range(
_outputMixerElement, minVol, maxVol);
LOG(LS_VERBOSE) << "Playout hardware volume range, min: " << minVol
<< ", max: " << maxVol;
if (errVal != 0)
{
LOG(LS_ERROR) << "Error setting playback volume range: "
<< snd_strerror(errVal);
return -1;
}
return 0;
}
*/
int32_t AudioMixerManagerLinuxALSA::SpeakerVolumeStepSize(
uint16_t& stepSize) const
{
if (_outputMixerHandle == NULL)
{
LOG(LS_WARNING) << "no avaliable output mixer exists";
return -1;
}
// The step size is always 1 for ALSA
stepSize = 1;
return 0;
}
int32_t AudioMixerManagerLinuxALSA::SpeakerVolumeIsAvailable(
bool& available)
{
if (_outputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable output mixer element exists";
return -1;
}
available = LATE(snd_mixer_selem_has_playback_volume)(_outputMixerElement);
return 0;
}
int32_t AudioMixerManagerLinuxALSA::SpeakerMuteIsAvailable(
bool& available)
{
if (_outputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable output mixer element exists";
return -1;
}
available = LATE(snd_mixer_selem_has_playback_switch)(_outputMixerElement);
return 0;
}
int32_t AudioMixerManagerLinuxALSA::SetSpeakerMute(bool enable)
{
LOG(LS_VERBOSE) << "AudioMixerManagerLinuxALSA::SetSpeakerMute(enable="
<< enable << ")";
rtc::CritScope lock(&_critSect);
if (_outputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable output mixer element exists";
return -1;
}
// Ensure that the selected speaker destination has a valid mute control.
bool available(false);
SpeakerMuteIsAvailable(available);
if (!available)
{
LOG(LS_WARNING) << "it is not possible to mute the speaker";
return -1;
}
// Note value = 0 (off) means muted
int errVal =
LATE(snd_mixer_selem_set_playback_switch_all)(_outputMixerElement,
!enable);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error setting playback switch: "
<< LATE(snd_strerror)(errVal);
return -1;
}
return (0);
}
int32_t AudioMixerManagerLinuxALSA::SpeakerMute(bool& enabled) const
{
if (_outputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable output mixer exists";
return -1;
}
// Ensure that the selected speaker destination has a valid mute control.
bool available =
LATE(snd_mixer_selem_has_playback_switch)(_outputMixerElement);
if (!available)
{
LOG(LS_WARNING) << "it is not possible to mute the speaker";
return -1;
}
int value(false);
// Retrieve one boolean control value for a specified mute-control
//
int
errVal = LATE(snd_mixer_selem_get_playback_switch)(
_outputMixerElement,
(snd_mixer_selem_channel_id_t) 0,
&value);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error getting playback switch: "
<< LATE(snd_strerror)(errVal);
return -1;
}
// Note value = 0 (off) means muted
enabled = (bool) !value;
return 0;
}
int32_t AudioMixerManagerLinuxALSA::MicrophoneMuteIsAvailable(
bool& available)
{
if (_inputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable input mixer element exists";
return -1;
}
available = LATE(snd_mixer_selem_has_capture_switch)(_inputMixerElement);
return 0;
}
int32_t AudioMixerManagerLinuxALSA::SetMicrophoneMute(bool enable)
{
LOG(LS_VERBOSE) << "AudioMixerManagerLinuxALSA::SetMicrophoneMute(enable="
<< enable << ")";
rtc::CritScope lock(&_critSect);
if (_inputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable input mixer element exists";
return -1;
}
// Ensure that the selected microphone destination has a valid mute control.
bool available(false);
MicrophoneMuteIsAvailable(available);
if (!available)
{
LOG(LS_WARNING) << "it is not possible to mute the microphone";
return -1;
}
// Note value = 0 (off) means muted
int errVal =
LATE(snd_mixer_selem_set_capture_switch_all)(_inputMixerElement,
!enable);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error setting capture switch: "
<< LATE(snd_strerror)(errVal);
return -1;
}
return (0);
}
int32_t AudioMixerManagerLinuxALSA::MicrophoneMute(bool& enabled) const
{
if (_inputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable input mixer exists";
return -1;
}
// Ensure that the selected microphone destination has a valid mute control.
bool available =
LATE(snd_mixer_selem_has_capture_switch)(_inputMixerElement);
if (!available)
{
LOG(LS_WARNING) << "it is not possible to mute the microphone";
return -1;
}
int value(false);
// Retrieve one boolean control value for a specified mute-control
//
int
errVal = LATE(snd_mixer_selem_get_capture_switch)(
_inputMixerElement,
(snd_mixer_selem_channel_id_t) 0,
&value);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error getting capture switch: "
<< LATE(snd_strerror)(errVal);
return -1;
}
// Note value = 0 (off) means muted
enabled = (bool) !value;
return 0;
}
int32_t AudioMixerManagerLinuxALSA::MicrophoneBoostIsAvailable(
bool& available)
{
if (_inputMixerHandle == NULL)
{
LOG(LS_WARNING) << "no avaliable input mixer exists";
return -1;
}
// Microphone boost cannot be enabled through ALSA Simple Mixer Interface
available = false;
return 0;
}
int32_t AudioMixerManagerLinuxALSA::SetMicrophoneBoost(bool enable)
{
LOG(LS_VERBOSE) << "AudioMixerManagerLinuxALSA::SetMicrophoneBoost(enable="
<< enable << ")";
rtc::CritScope lock(&_critSect);
if (_inputMixerHandle == NULL)
{
LOG(LS_WARNING) << "no avaliable input mixer exists";
return -1;
}
// Ensure that the selected microphone destination has a valid mute control.
bool available(false);
MicrophoneMuteIsAvailable(available);
if (!available)
{
LOG(LS_WARNING) << "it is not possible to enable microphone boost";
return -1;
}
// It is assumed that the call above fails!
return (0);
}
int32_t AudioMixerManagerLinuxALSA::MicrophoneBoost(bool& enabled) const
{
if (_inputMixerHandle == NULL)
{
LOG(LS_WARNING) << "no avaliable input mixer exists";
return -1;
}
// Microphone boost cannot be enabled on this platform!
enabled = false;
return 0;
}
int32_t AudioMixerManagerLinuxALSA::MicrophoneVolumeIsAvailable(
bool& available)
{
if (_inputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable input mixer element exists";
return -1;
}
available = LATE(snd_mixer_selem_has_capture_volume)(_inputMixerElement);
return 0;
}
int32_t AudioMixerManagerLinuxALSA::SetMicrophoneVolume(
uint32_t volume)
{
LOG(LS_VERBOSE) << "AudioMixerManagerLinuxALSA::SetMicrophoneVolume(volume="
<< volume << ")";
rtc::CritScope lock(&_critSect);
if (_inputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable input mixer element exists";
return -1;
}
int
errVal =
LATE(snd_mixer_selem_set_capture_volume_all)(_inputMixerElement,
volume);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error changing microphone volume: "
<< LATE(snd_strerror)(errVal);
return -1;
}
return (0);
}
// TL: Have done testnig with these but they don't seem reliable and
// they were therefore not added
/*
// ----------------------------------------------------------------------------
// SetMaxMicrophoneVolume
// ----------------------------------------------------------------------------
int32_t AudioMixerManagerLinuxALSA::SetMaxMicrophoneVolume(
uint32_t maxVolume)
{
if (_inputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable output mixer element exists";
return -1;
}
long int minVol(0);
long int maxVol(0);
int errVal = snd_mixer_selem_get_capture_volume_range(_inputMixerElement,
&minVol, &maxVol);
if ((maxVol <= minVol) || (errVal != 0))
{
LOG(LS_WARNING) << "Error getting capture volume range: "
<< snd_strerror(errVal);
}
maxVol = (long int)maxVolume;
printf("min %d max %d", minVol, maxVol);
errVal = snd_mixer_selem_set_capture_volume_range(_inputMixerElement, minVol, maxVol);
LOG(LS_VERBOSE) << "Capture hardware volume range, min: " << minVol
<< ", max: " << maxVol;
if (errVal != 0)
{
LOG(LS_ERROR) << "Error setting capture volume range: "
<< snd_strerror(errVal);
return -1;
}
return 0;
}
// ----------------------------------------------------------------------------
// SetMinMicrophoneVolume
// ----------------------------------------------------------------------------
int32_t AudioMixerManagerLinuxALSA::SetMinMicrophoneVolume(
uint32_t minVolume)
{
if (_inputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable output mixer element exists";
return -1;
}
long int minVol(0);
long int maxVol(0);
int errVal = snd_mixer_selem_get_capture_volume_range(
_inputMixerElement, &minVol, &maxVol);
if (maxVol <= minVol)
{
//maxVol = 255;
LOG(LS_WARNING) << "Error getting capture volume range: "
<< snd_strerror(errVal);
}
printf("min %d max %d", minVol, maxVol);
minVol = (long int)minVolume;
errVal = snd_mixer_selem_set_capture_volume_range(
_inputMixerElement, minVol, maxVol);
LOG(LS_VERBOSE) << "Capture hardware volume range, min: " << minVol
<< ", max: " << maxVol;
if (errVal != 0)
{
LOG(LS_ERROR) << "Error setting capture volume range: "
<< snd_strerror(errVal);
return -1;
}
return 0;
}
*/
int32_t AudioMixerManagerLinuxALSA::MicrophoneVolume(
uint32_t& volume) const
{
if (_inputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable input mixer element exists";
return -1;
}
long int vol(0);
int
errVal =
LATE(snd_mixer_selem_get_capture_volume)(
_inputMixerElement,
(snd_mixer_selem_channel_id_t) 0,
&vol);
if (errVal < 0)
{
LOG(LS_ERROR) << "Error getting inputvolume: "
<< LATE(snd_strerror)(errVal);
return -1;
}
LOG(LS_VERBOSE) << "AudioMixerManagerLinuxALSA::MicrophoneVolume() => vol="
<< vol;
volume = static_cast<uint32_t> (vol);
return 0;
}
int32_t AudioMixerManagerLinuxALSA::MaxMicrophoneVolume(
uint32_t& maxVolume) const
{
if (_inputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable input mixer element exists";
return -1;
}
long int minVol(0);
long int maxVol(0);
// check if we have mic volume at all
if (!LATE(snd_mixer_selem_has_capture_volume)(_inputMixerElement))
{
LOG(LS_ERROR) << "No microphone volume available";
return -1;
}
int errVal =
LATE(snd_mixer_selem_get_capture_volume_range)(_inputMixerElement,
&minVol, &maxVol);
LOG(LS_VERBOSE) << "Microphone hardware volume range, min: " << minVol
<< ", max: " << maxVol;
if (maxVol <= minVol)
{
LOG(LS_ERROR) << "Error getting microphone volume range: "
<< LATE(snd_strerror)(errVal);
}
maxVolume = static_cast<uint32_t> (maxVol);
return 0;
}
int32_t AudioMixerManagerLinuxALSA::MinMicrophoneVolume(
uint32_t& minVolume) const
{
if (_inputMixerElement == NULL)
{
LOG(LS_WARNING) << "no avaliable input mixer element exists";
return -1;
}
long int minVol(0);
long int maxVol(0);
int errVal =
LATE(snd_mixer_selem_get_capture_volume_range)(_inputMixerElement,
&minVol, &maxVol);
LOG(LS_VERBOSE) << "Microphone hardware volume range, min: " << minVol
<< ", max: " << maxVol;
if (maxVol <= minVol)
{
LOG(LS_ERROR) << "Error getting microphone volume range: "
<< LATE(snd_strerror)(errVal);
}
minVolume = static_cast<uint32_t> (minVol);
return 0;
}
int32_t AudioMixerManagerLinuxALSA::MicrophoneVolumeStepSize(
uint16_t& stepSize) const
{
if (_inputMixerHandle == NULL)
{
LOG(LS_WARNING) << "no avaliable input mixer exists";
return -1;
}
// The step size is always 1 for ALSA
stepSize = 1;
return 0;
}
// ============================================================================
// Private Methods
// ============================================================================
int32_t AudioMixerManagerLinuxALSA::LoadMicMixerElement() const
{
int errVal = LATE(snd_mixer_load)(_inputMixerHandle);
if (errVal < 0)
{
LOG(LS_ERROR) << "snd_mixer_load(_inputMixerHandle), error: "
<< LATE(snd_strerror)(errVal);
_inputMixerHandle = NULL;
return -1;
}
snd_mixer_elem_t *elem = NULL;
snd_mixer_elem_t *micElem = NULL;
unsigned mixerIdx = 0;
const char *selemName = NULL;
// Find and store handles to the right mixer elements
for (elem = LATE(snd_mixer_first_elem)(_inputMixerHandle); elem; elem
= LATE(snd_mixer_elem_next)(elem), mixerIdx++)
{
if (LATE(snd_mixer_selem_is_active)(elem))
{
selemName = LATE(snd_mixer_selem_get_name)(elem);
if (strcmp(selemName, "Capture") == 0) // "Capture", "Mic"
{
_inputMixerElement = elem;
LOG(LS_VERBOSE) << "Capture element set";
} else if (strcmp(selemName, "Mic") == 0)
{
micElem = elem;
LOG(LS_VERBOSE) << "Mic element found";
}
}
if (_inputMixerElement)
{
// Use the first Capture element that is found
// The second one may not work
break;
}
}
if (_inputMixerElement == NULL)
{
// We didn't find a Capture handle, use Mic.
if (micElem != NULL)
{
_inputMixerElement = micElem;
LOG(LS_VERBOSE) << "Using Mic as capture volume.";
} else
{
_inputMixerElement = NULL;
LOG(LS_ERROR) << "Could not find capture volume on the mixer.";
return -1;
}
}
return 0;
}
int32_t AudioMixerManagerLinuxALSA::LoadSpeakerMixerElement() const
{
int errVal = LATE(snd_mixer_load)(_outputMixerHandle);
if (errVal < 0)
{
LOG(LS_ERROR) << "snd_mixer_load(_outputMixerHandle), error: "
<< LATE(snd_strerror)(errVal);
_outputMixerHandle = NULL;
return -1;
}
snd_mixer_elem_t *elem = NULL;
snd_mixer_elem_t *masterElem = NULL;
snd_mixer_elem_t *speakerElem = NULL;
unsigned mixerIdx = 0;
const char *selemName = NULL;
// Find and store handles to the right mixer elements
for (elem = LATE(snd_mixer_first_elem)(_outputMixerHandle); elem; elem
= LATE(snd_mixer_elem_next)(elem), mixerIdx++)
{
if (LATE(snd_mixer_selem_is_active)(elem))
{
selemName = LATE(snd_mixer_selem_get_name)(elem);
LOG(LS_VERBOSE) << "snd_mixer_selem_get_name " << mixerIdx << ": "
<< selemName << " =" << elem;
// "Master", "PCM", "Wave", "Master Mono", "PC Speaker", "PCM", "Wave"
if (strcmp(selemName, "PCM") == 0)
{
_outputMixerElement = elem;
LOG(LS_VERBOSE) << "PCM element set";
} else if (strcmp(selemName, "Master") == 0)
{
masterElem = elem;
LOG(LS_VERBOSE) << "Master element found";
} else if (strcmp(selemName, "Speaker") == 0)
{
speakerElem = elem;
LOG(LS_VERBOSE) << "Speaker element found";
}
}
if (_outputMixerElement)
{
// We have found the element we want
break;
}
}
// If we didn't find a PCM Handle, use Master or Speaker
if (_outputMixerElement == NULL)
{
if (masterElem != NULL)
{
_outputMixerElement = masterElem;
LOG(LS_VERBOSE) << "Using Master as output volume.";
} else if (speakerElem != NULL)
{
_outputMixerElement = speakerElem;
LOG(LS_VERBOSE) << "Using Speaker as output volume.";
} else
{
_outputMixerElement = NULL;
LOG(LS_ERROR) << "Could not find output volume in the mixer.";
return -1;
}
}
return 0;
}
void AudioMixerManagerLinuxALSA::GetControlName(char* controlName,
char* deviceName) const
{
// Example
// deviceName: "front:CARD=Intel,DEV=0"
// controlName: "hw:CARD=Intel"
char* pos1 = strchr(deviceName, ':');
char* pos2 = strchr(deviceName, ',');
if (!pos2) {
// Can also be default:CARD=Intel
pos2 = &deviceName[strlen(deviceName)];
}
if (pos1 && pos2) {
strcpy(controlName, "hw");
int nChar = (int) (pos2 - pos1);
strncpy(&controlName[2], pos1, nChar);
controlName[2 + nChar] = '\0';
} else {
strcpy(controlName, deviceName);
}
}
}