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AESinkALSA.cpp
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AESinkALSA.cpp
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/*
* Copyright (C) 2010-2013 Team XBMC
* http://xbmc.org
*
* This Program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This Program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with XBMC; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include "system.h"
#include <stdint.h>
#include <limits.h>
#include <sys/utsname.h>
#include <set>
#include <sstream>
#include <string>
#include <algorithm>
#include "AESinkALSA.h"
#include "cores/AudioEngine/AESinkFactory.h"
#include "cores/AudioEngine/Utils/AEUtil.h"
#include "cores/AudioEngine/Utils/AEELDParser.h"
#include "utils/log.h"
#include "utils/MathUtils.h"
#include "utils/SystemInfo.h"
#include "threads/SingleLock.h"
#include "settings/AdvancedSettings.h"
#if defined(HAS_LIBAMCODEC)
#include "utils/AMLUtils.h"
#endif
#ifdef TARGET_POSIX
#include "linux/XTimeUtils.h"
#endif
#define AE_MIN_PERIODSIZE 256
#define ALSA_CHMAP_KERNEL_BLACKLIST
#define ALSA_OPTIONS (SND_PCM_NO_AUTO_FORMAT | SND_PCM_NO_AUTO_CHANNELS | SND_PCM_NO_AUTO_RESAMPLE)
#define ALSA_MAX_CHANNELS 16
static enum AEChannel LegacyALSAChannelMap[ALSA_MAX_CHANNELS + 1] = {
AE_CH_FL , AE_CH_FR , AE_CH_BL , AE_CH_BR , AE_CH_FC , AE_CH_LFE , AE_CH_SL , AE_CH_SR ,
AE_CH_UNKNOWN1, AE_CH_UNKNOWN2, AE_CH_UNKNOWN3, AE_CH_UNKNOWN4, AE_CH_UNKNOWN5, AE_CH_UNKNOWN6, AE_CH_UNKNOWN7, AE_CH_UNKNOWN8, /* for p16v devices */
AE_CH_NULL
};
static enum AEChannel LegacyALSAChannelMap51Wide[ALSA_MAX_CHANNELS + 1] = {
AE_CH_FL , AE_CH_FR , AE_CH_SL , AE_CH_SR , AE_CH_FC , AE_CH_LFE , AE_CH_BL , AE_CH_BR ,
AE_CH_UNKNOWN1, AE_CH_UNKNOWN2, AE_CH_UNKNOWN3, AE_CH_UNKNOWN4, AE_CH_UNKNOWN5, AE_CH_UNKNOWN6, AE_CH_UNKNOWN7, AE_CH_UNKNOWN8, /* for p16v devices */
AE_CH_NULL
};
static enum AEChannel ALSAChannelMapPassthrough[ALSA_MAX_CHANNELS + 1] = {
AE_CH_RAW , AE_CH_RAW , AE_CH_RAW , AE_CH_RAW , AE_CH_RAW , AE_CH_RAW , AE_CH_RAW , AE_CH_RAW ,
AE_CH_UNKNOWN1, AE_CH_UNKNOWN2, AE_CH_UNKNOWN3, AE_CH_UNKNOWN4, AE_CH_UNKNOWN5, AE_CH_UNKNOWN6, AE_CH_UNKNOWN7, AE_CH_UNKNOWN8, /* for p16v devices */
AE_CH_NULL
};
static unsigned int ALSASampleRateList[] =
{
5512,
8000,
11025,
16000,
22050,
32000,
44100,
48000,
64000,
88200,
96000,
176400,
192000,
384000,
0
};
CAESinkALSA::CAESinkALSA() :
m_bufferSize(0),
m_formatSampleRateMul(0.0),
m_passthrough(false),
m_pcm(NULL),
m_timeout(0),
m_fragmented(false),
m_originalPeriodSize(AE_MIN_PERIODSIZE)
{
/* ensure that ALSA has been initialized */
if (!snd_config)
snd_config_update();
}
CAESinkALSA::~CAESinkALSA()
{
Deinitialize();
}
void CAESinkALSA::Register()
{
AE::AESinkRegEntry entry;
entry.sinkName = "ALSA";
entry.createFunc = CAESinkALSA::Create;
entry.enumerateFunc = CAESinkALSA::EnumerateDevicesEx;
AE::CAESinkFactory::RegisterSink(entry);
}
IAESink* CAESinkALSA::Create(std::string &device, AEAudioFormat& desiredFormat)
{
IAESink* sink = new CAESinkALSA();
if (sink->Initialize(desiredFormat, device))
return sink;
delete sink;
return nullptr;
}
inline CAEChannelInfo CAESinkALSA::GetChannelLayoutRaw(const AEAudioFormat& format)
{
unsigned int count = 0;
switch (format.m_streamInfo.m_type)
{
case CAEStreamInfo::STREAM_TYPE_DTSHD:
case CAEStreamInfo::STREAM_TYPE_TRUEHD:
count = 8;
break;
case CAEStreamInfo::STREAM_TYPE_DTSHD_CORE:
case CAEStreamInfo::STREAM_TYPE_DTS_512:
case CAEStreamInfo::STREAM_TYPE_DTS_1024:
case CAEStreamInfo::STREAM_TYPE_DTS_2048:
case CAEStreamInfo::STREAM_TYPE_AC3:
case CAEStreamInfo::STREAM_TYPE_EAC3:
count = 2;
break;
default:
count = 0;
break;
}
CAEChannelInfo info;
for (unsigned int i = 0; i < count; ++i)
info += ALSAChannelMapPassthrough[i];
return info;
}
inline CAEChannelInfo CAESinkALSA::GetChannelLayoutLegacy(const AEAudioFormat& format, unsigned int minChannels, unsigned int maxChannels)
{
enum AEChannel* channelMap = LegacyALSAChannelMap;
unsigned int count = 0;
if (format.m_dataFormat == AE_FMT_RAW)
return GetChannelLayoutRaw(format);
// According to CEA-861-D only RL and RR are known. In case of a format having SL and SR channels
// but no BR BL channels, we use the wide map in order to open only the num of channels really
// needed.
if (format.m_channelLayout.HasChannel(AE_CH_SL) && !format.m_channelLayout.HasChannel(AE_CH_BL))
{
channelMap = LegacyALSAChannelMap51Wide;
}
for (unsigned int c = 0; c < 8; ++c)
{
for (unsigned int i = 0; i < format.m_channelLayout.Count(); ++i)
{
if (format.m_channelLayout[i] == channelMap[c])
{
count = c + 1;
break;
}
}
}
count = std::max(count, minChannels);
count = std::min(count, maxChannels);
CAEChannelInfo info;
for (unsigned int i = 0; i < count; ++i)
info += channelMap[i];
return info;
}
inline CAEChannelInfo CAESinkALSA::GetChannelLayout(const AEAudioFormat& format, unsigned int channels)
{
CAEChannelInfo info;
std::string alsaMapStr("none");
if (format.m_dataFormat == AE_FMT_RAW)
{
info = GetChannelLayoutRaw(format);
}
else
{
#ifdef SND_CHMAP_API_VERSION
/* ask for the actual map */
snd_pcm_chmap_t* actualMap = NULL;
if (AllowALSAMaps())
actualMap = snd_pcm_get_chmap(m_pcm);
if (actualMap)
{
alsaMapStr = ALSAchmapToString(actualMap);
info = ALSAchmapToAEChannelMap(actualMap);
/* "fake" a compatible map if it is more suitable for AE */
if (!info.ContainsChannels(format.m_channelLayout))
{
CAEChannelInfo infoAlternate = GetAlternateLayoutForm(info);
if (infoAlternate.Count())
{
std::vector<CAEChannelInfo> alts;
alts.push_back(info);
alts.push_back(infoAlternate);
if (format.m_channelLayout.BestMatch(alts) == 1)
info = infoAlternate;
}
}
/* add empty channels as needed (with e.g. FL,FR,LFE in 4ch) */
while (info.Count() < channels)
info += AE_CH_UNKNOWN1;
free(actualMap);
}
else
#endif
{
info = GetChannelLayoutLegacy(format, channels, channels);
}
}
CLog::Log(LOGDEBUG, "CAESinkALSA::GetChannelLayout - Input Channel Count: %d Output Channel Count: %d", format.m_channelLayout.Count(), info.Count());
CLog::Log(LOGDEBUG, "CAESinkALSA::GetChannelLayout - Requested Layout: %s", std::string(format.m_channelLayout).c_str());
CLog::Log(LOGDEBUG, "CAESinkALSA::GetChannelLayout - Got Layout: %s (ALSA: %s)", std::string(info).c_str(), alsaMapStr.c_str());
return info;
}
#ifdef SND_CHMAP_API_VERSION
bool CAESinkALSA::AllowALSAMaps()
{
/*
* Some older kernels had various bugs in the HDA HDMI channel mapping, so just
* blanket blacklist them for now to avoid any breakage.
* Should be reasonably safe but still blacklisted:
* 3.10.20+, 3.11.9+, 3.12.1+
* Safe:
* 3.12.15+, 3.13+
*/
#ifdef ALSA_CHMAP_KERNEL_BLACKLIST
static bool checked = false;
static bool allowed;
if (!checked)
allowed = strverscmp(g_sysinfo.GetKernelVersionFull().c_str(), "3.12.15") >= 0;
checked = true;
return allowed;
#else
return true;
#endif
}
AEChannel CAESinkALSA::ALSAChannelToAEChannel(unsigned int alsaChannel)
{
AEChannel aeChannel;
switch (alsaChannel)
{
case SND_CHMAP_FL: aeChannel = AE_CH_FL; break;
case SND_CHMAP_FR: aeChannel = AE_CH_FR; break;
case SND_CHMAP_FC: aeChannel = AE_CH_FC; break;
case SND_CHMAP_LFE: aeChannel = AE_CH_LFE; break;
case SND_CHMAP_RL: aeChannel = AE_CH_BL; break;
case SND_CHMAP_RR: aeChannel = AE_CH_BR; break;
case SND_CHMAP_FLC: aeChannel = AE_CH_FLOC; break;
case SND_CHMAP_FRC: aeChannel = AE_CH_FROC; break;
case SND_CHMAP_RC: aeChannel = AE_CH_BC; break;
case SND_CHMAP_SL: aeChannel = AE_CH_SL; break;
case SND_CHMAP_SR: aeChannel = AE_CH_SR; break;
case SND_CHMAP_TFL: aeChannel = AE_CH_TFL; break;
case SND_CHMAP_TFR: aeChannel = AE_CH_TFR; break;
case SND_CHMAP_TFC: aeChannel = AE_CH_TFC; break;
case SND_CHMAP_TC: aeChannel = AE_CH_TC; break;
case SND_CHMAP_TRL: aeChannel = AE_CH_TBL; break;
case SND_CHMAP_TRR: aeChannel = AE_CH_TBR; break;
case SND_CHMAP_TRC: aeChannel = AE_CH_TBC; break;
case SND_CHMAP_RLC: aeChannel = AE_CH_BLOC; break;
case SND_CHMAP_RRC: aeChannel = AE_CH_BROC; break;
default: aeChannel = AE_CH_UNKNOWN1; break;
}
return aeChannel;
}
unsigned int CAESinkALSA::AEChannelToALSAChannel(AEChannel aeChannel)
{
unsigned int alsaChannel;
switch (aeChannel)
{
case AE_CH_FL: alsaChannel = SND_CHMAP_FL; break;
case AE_CH_FR: alsaChannel = SND_CHMAP_FR; break;
case AE_CH_FC: alsaChannel = SND_CHMAP_FC; break;
case AE_CH_LFE: alsaChannel = SND_CHMAP_LFE; break;
case AE_CH_BL: alsaChannel = SND_CHMAP_RL; break;
case AE_CH_BR: alsaChannel = SND_CHMAP_RR; break;
case AE_CH_FLOC: alsaChannel = SND_CHMAP_FLC; break;
case AE_CH_FROC: alsaChannel = SND_CHMAP_FRC; break;
case AE_CH_BC: alsaChannel = SND_CHMAP_RC; break;
case AE_CH_SL: alsaChannel = SND_CHMAP_SL; break;
case AE_CH_SR: alsaChannel = SND_CHMAP_SR; break;
case AE_CH_TFL: alsaChannel = SND_CHMAP_TFL; break;
case AE_CH_TFR: alsaChannel = SND_CHMAP_TFR; break;
case AE_CH_TFC: alsaChannel = SND_CHMAP_TFC; break;
case AE_CH_TC: alsaChannel = SND_CHMAP_TC; break;
case AE_CH_TBL: alsaChannel = SND_CHMAP_TRL; break;
case AE_CH_TBR: alsaChannel = SND_CHMAP_TRR; break;
case AE_CH_TBC: alsaChannel = SND_CHMAP_TRC; break;
case AE_CH_BLOC: alsaChannel = SND_CHMAP_RLC; break;
case AE_CH_BROC: alsaChannel = SND_CHMAP_RRC; break;
default: alsaChannel = SND_CHMAP_UNKNOWN; break;
}
return alsaChannel;
}
CAEChannelInfo CAESinkALSA::ALSAchmapToAEChannelMap(snd_pcm_chmap_t* alsaMap)
{
CAEChannelInfo info;
for (unsigned int i = 0; i < alsaMap->channels; i++)
info += ALSAChannelToAEChannel(alsaMap->pos[i]);
return info;
}
snd_pcm_chmap_t* CAESinkALSA::AEChannelMapToALSAchmap(const CAEChannelInfo& info)
{
int AECount = info.Count();
snd_pcm_chmap_t* alsaMap = (snd_pcm_chmap_t*)malloc(sizeof(snd_pcm_chmap_t) + AECount * sizeof(int));
alsaMap->channels = AECount;
for (int i = 0; i < AECount; i++)
alsaMap->pos[i] = AEChannelToALSAChannel(info[i]);
return alsaMap;
}
snd_pcm_chmap_t* CAESinkALSA::CopyALSAchmap(snd_pcm_chmap_t* alsaMap)
{
snd_pcm_chmap_t* copyMap = (snd_pcm_chmap_t*)malloc(sizeof(snd_pcm_chmap_t) + alsaMap->channels * sizeof(int));
copyMap->channels = alsaMap->channels;
memcpy(copyMap->pos, alsaMap->pos, alsaMap->channels * sizeof(int));
return copyMap;
}
std::string CAESinkALSA::ALSAchmapToString(snd_pcm_chmap_t* alsaMap)
{
char buf[128] = { 0 };
//! @bug ALSA bug - buffer overflow by a factor of 2 is possible
//! http://mailman.alsa-project.org/pipermail/alsa-devel/2014-December/085815.html
int err = snd_pcm_chmap_print(alsaMap, sizeof(buf) / 2, buf);
if (err < 0)
return "Error";
return std::string(buf);
}
CAEChannelInfo CAESinkALSA::GetAlternateLayoutForm(const CAEChannelInfo& info)
{
CAEChannelInfo altLayout;
/* only handle symmetrical layouts */
if (info.HasChannel(AE_CH_BL) == info.HasChannel(AE_CH_BR) &&
info.HasChannel(AE_CH_SL) == info.HasChannel(AE_CH_SR) &&
info.HasChannel(AE_CH_BLOC) == info.HasChannel(AE_CH_BROC))
{
/* CEA-861-D used by HDMI 1.x has 7.1 as back+back-x-of-center, not
* side+back. Mangle it here. */
if (info.HasChannel(AE_CH_SL) && info.HasChannel(AE_CH_BL) && !info.HasChannel(AE_CH_BLOC))
{
altLayout = info;
altLayout.ReplaceChannel(AE_CH_BL, AE_CH_BLOC);
altLayout.ReplaceChannel(AE_CH_BR, AE_CH_BROC);
altLayout.ReplaceChannel(AE_CH_SL, AE_CH_BL);
altLayout.ReplaceChannel(AE_CH_SR, AE_CH_BR);
}
/* same in reverse */
else if (!info.HasChannel(AE_CH_SL) && info.HasChannel(AE_CH_BL) && info.HasChannel(AE_CH_BLOC))
{
altLayout = info;
altLayout.ReplaceChannel(AE_CH_BL, AE_CH_SL);
altLayout.ReplaceChannel(AE_CH_BR, AE_CH_SR);
altLayout.ReplaceChannel(AE_CH_BLOC, AE_CH_BL);
altLayout.ReplaceChannel(AE_CH_BROC, AE_CH_BR);
}
/* We have side speakers but no back speakers, allow map to back
* speakers. */
else if (info.HasChannel(AE_CH_SL) && !info.HasChannel(AE_CH_BL))
{
altLayout = info;
altLayout.ReplaceChannel(AE_CH_SL, AE_CH_BL);
altLayout.ReplaceChannel(AE_CH_SR, AE_CH_BR);
}
/* reverse */
else if (!info.HasChannel(AE_CH_SL) && info.HasChannel(AE_CH_BL))
{
altLayout = info;
altLayout.ReplaceChannel(AE_CH_BL, AE_CH_SL);
altLayout.ReplaceChannel(AE_CH_BR, AE_CH_SR);
}
}
return altLayout;
}
snd_pcm_chmap_t* CAESinkALSA::SelectALSAChannelMap(const CAEChannelInfo& info)
{
snd_pcm_chmap_t* chmap = NULL;
snd_pcm_chmap_query_t** supportedMaps;
supportedMaps = snd_pcm_query_chmaps(m_pcm);
if (!supportedMaps)
return NULL;
CAEChannelInfo infoAlternate = GetAlternateLayoutForm(info);
/* for efficiency, first try to find an exact match, and only then fallback
* to searching for less perfect matches */
int i = 0;
for (snd_pcm_chmap_query_t* supportedMap = supportedMaps[i++];
supportedMap; supportedMap = supportedMaps[i++])
{
if (supportedMap->map.channels == info.Count())
{
CAEChannelInfo candidate = ALSAchmapToAEChannelMap(&supportedMap->map);
const CAEChannelInfo* selectedInfo = &info;
if (!candidate.ContainsChannels(info) || !info.ContainsChannels(candidate))
{
selectedInfo = &infoAlternate;
if (!candidate.ContainsChannels(infoAlternate) || !infoAlternate.ContainsChannels(candidate))
continue;
}
if (supportedMap->type == SND_CHMAP_TYPE_VAR)
{
/* device supports the AE map directly */
chmap = AEChannelMapToALSAchmap(*selectedInfo);
break;
}
else
{
/* device needs 1:1 remapping */
chmap = CopyALSAchmap(&supportedMap->map);
break;
}
}
}
/* if no exact chmap was found, fallback to best-effort */
if (!chmap)
{
CAEChannelInfo allChannels;
std::vector<CAEChannelInfo> supportedMapsAE;
/* Convert the ALSA maps to AE maps. */
int i = 0;
for (snd_pcm_chmap_query_t* supportedMap = supportedMaps[i++];
supportedMap; supportedMap = supportedMaps[i++])
supportedMapsAE.push_back(ALSAchmapToAEChannelMap(&supportedMap->map));
int score = 0;
int best = info.BestMatch(supportedMapsAE, &score);
/* see if we find a better result with the alternate form */
if (infoAlternate.Count() && score < 0)
{
int scoreAlt = 0;
int bestAlt = infoAlternate.BestMatch(supportedMapsAE, &scoreAlt);
if (scoreAlt > score)
best = bestAlt;
}
if (best > 0)
chmap = CopyALSAchmap(&supportedMaps[best]->map);
}
if (chmap && g_advancedSettings.CanLogComponent(LOGAUDIO))
CLog::Log(LOGDEBUG, "CAESinkALSA::SelectALSAChannelMap - Selected ALSA map \"%s\"", ALSAchmapToString(chmap).c_str());
snd_pcm_free_chmaps(supportedMaps);
return chmap;
}
#endif // SND_CHMAP_API_VERSION
void CAESinkALSA::GetAESParams(const AEAudioFormat& format, std::string& params)
{
if (m_passthrough)
params = "AES0=0x06";
else
params = "AES0=0x04";
params += ",AES1=0x82,AES2=0x00";
if (m_passthrough && format.m_channelLayout.Count() == 8) params += ",AES3=0x09";
else if (format.m_sampleRate == 192000) params += ",AES3=0x0e";
else if (format.m_sampleRate == 176400) params += ",AES3=0x0c";
else if (format.m_sampleRate == 96000) params += ",AES3=0x0a";
else if (format.m_sampleRate == 88200) params += ",AES3=0x08";
else if (format.m_sampleRate == 48000) params += ",AES3=0x02";
else if (format.m_sampleRate == 44100) params += ",AES3=0x00";
else if (format.m_sampleRate == 32000) params += ",AES3=0x03";
else params += ",AES3=0x01";
}
bool CAESinkALSA::Initialize(AEAudioFormat &format, std::string &device)
{
m_initDevice = device;
m_initFormat = format;
ALSAConfig inconfig, outconfig;
inconfig.format = format.m_dataFormat;
inconfig.sampleRate = format.m_sampleRate;
/*
* We can't use the better GetChannelLayout() at this point as the device
* is not opened yet, and we need inconfig.channels to select the correct
* device... Legacy layouts should be accurate enough for device selection
* in all cases, though.
*/
inconfig.channels = GetChannelLayoutLegacy(format, 2, 8).Count();
/* if we are raw, correct the data format */
if (format.m_dataFormat == AE_FMT_RAW)
{
inconfig.format = AE_FMT_S16NE;
m_passthrough = true;
}
else
{
m_passthrough = false;
}
#if defined(HAS_LIBAMCODEC)
if (aml_present())
{
aml_set_audio_passthrough(m_passthrough);
}
#endif
if (inconfig.channels == 0)
{
CLog::Log(LOGERROR, "CAESinkALSA::Initialize - Unable to open the requested channel layout");
return false;
}
AEDeviceType devType = AEDeviceTypeFromName(device);
std::string AESParams;
/* digital interfaces should have AESx set, though in practice most
* receivers don't care */
if (m_passthrough || devType == AE_DEVTYPE_HDMI || devType == AE_DEVTYPE_IEC958)
GetAESParams(format, AESParams);
CLog::Log(LOGINFO, "CAESinkALSA::Initialize - Attempting to open device \"%s\"", device.c_str());
/* get the sound config */
snd_config_t *config;
snd_config_copy(&config, snd_config);
if (!OpenPCMDevice(device, AESParams, inconfig.channels, &m_pcm, config))
{
CLog::Log(LOGERROR, "CAESinkALSA::Initialize - failed to initialize device \"%s\"", device.c_str());
snd_config_delete(config);
return false;
}
/* get the actual device name that was used */
device = snd_pcm_name(m_pcm);
m_device = device;
CLog::Log(LOGINFO, "CAESinkALSA::Initialize - Opened device \"%s\"", device.c_str());
/* free the sound config */
snd_config_delete(config);
#ifdef SND_CHMAP_API_VERSION
snd_pcm_chmap_t* selectedChmap = NULL;
if (!m_passthrough && AllowALSAMaps())
{
selectedChmap = SelectALSAChannelMap(format.m_channelLayout);
if (selectedChmap)
{
/* update wanted channel count according to the selected map */
inconfig.channels = selectedChmap->channels;
}
}
#endif
if (!InitializeHW(inconfig, outconfig) || !InitializeSW(outconfig))
{
#ifdef SND_CHMAP_API_VERSION
free(selectedChmap);
#endif
return false;
}
#ifdef SND_CHMAP_API_VERSION
if (selectedChmap)
{
/* failure is OK, that likely just means the selected chmap is fixed already */
snd_pcm_set_chmap(m_pcm, selectedChmap);
free(selectedChmap);
}
#endif
// we want it blocking
snd_pcm_nonblock(m_pcm, 0);
snd_pcm_prepare (m_pcm);
if (m_passthrough && inconfig.channels != outconfig.channels)
{
CLog::Log(LOGINFO, "CAESinkALSA::Initialize - could not open required number of channels");
return false;
}
// adjust format to the configuration we got
format.m_channelLayout = GetChannelLayout(format, outconfig.channels);
// we might end up with an unusable channel layout that contains only UNKNOWN
// channels, let's do a sanity check.
if (!format.m_channelLayout.IsLayoutValid())
return false;
format.m_sampleRate = outconfig.sampleRate;
format.m_frames = outconfig.periodSize;
format.m_frameSize = outconfig.frameSize;
format.m_dataFormat = outconfig.format;
m_format = format;
m_formatSampleRateMul = 1.0 / (double)m_format.m_sampleRate;
return true;
}
snd_pcm_format_t CAESinkALSA::AEFormatToALSAFormat(const enum AEDataFormat format)
{
if (format == AE_FMT_RAW)
return SND_PCM_FORMAT_S16;
switch (format)
{
case AE_FMT_U8 : return SND_PCM_FORMAT_U8;
case AE_FMT_S16NE : return SND_PCM_FORMAT_S16;
case AE_FMT_S16LE : return SND_PCM_FORMAT_S16_LE;
case AE_FMT_S16BE : return SND_PCM_FORMAT_S16_BE;
case AE_FMT_S24NE4: return SND_PCM_FORMAT_S24;
#ifdef __BIG_ENDIAN__
case AE_FMT_S24NE3: return SND_PCM_FORMAT_S24_3BE;
#else
case AE_FMT_S24NE3: return SND_PCM_FORMAT_S24_3LE;
#endif
case AE_FMT_S32NE : return SND_PCM_FORMAT_S32;
case AE_FMT_FLOAT : return SND_PCM_FORMAT_FLOAT;
default:
return SND_PCM_FORMAT_UNKNOWN;
}
}
bool CAESinkALSA::InitializeHW(const ALSAConfig &inconfig, ALSAConfig &outconfig)
{
snd_pcm_hw_params_t *hw_params;
snd_pcm_hw_params_alloca(&hw_params);
memset(hw_params, 0, snd_pcm_hw_params_sizeof());
snd_pcm_hw_params_any(m_pcm, hw_params);
snd_pcm_hw_params_set_access(m_pcm, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
unsigned int sampleRate = inconfig.sampleRate;
snd_pcm_hw_params_set_rate_near (m_pcm, hw_params, &sampleRate, NULL);
unsigned int channelCount = inconfig.channels;
/* select a channel count >=wanted, or otherwise the highest available */
if (snd_pcm_hw_params_set_channels_min(m_pcm, hw_params, &channelCount) == 0)
snd_pcm_hw_params_set_channels_first(m_pcm, hw_params, &channelCount);
else
snd_pcm_hw_params_set_channels_last(m_pcm, hw_params, &channelCount);
/* ensure we opened X channels or more */
if (inconfig.channels > channelCount)
{
CLog::Log(LOGINFO, "CAESinkALSA::InitializeHW - Unable to open the required number of channels");
}
/* update outconfig */
outconfig.channels = channelCount;
snd_pcm_format_t fmt = AEFormatToALSAFormat(inconfig.format);
outconfig.format = inconfig.format;
if (fmt == SND_PCM_FORMAT_UNKNOWN)
{
/* if we dont support the requested format, fallback to float */
fmt = SND_PCM_FORMAT_FLOAT;
outconfig.format = AE_FMT_FLOAT;
}
/* try the data format */
if (snd_pcm_hw_params_set_format(m_pcm, hw_params, fmt) < 0)
{
/* if the chosen format is not supported, try each one in descending order */
CLog::Log(LOGINFO, "CAESinkALSA::InitializeHW - Your hardware does not support %s, trying other formats", CAEUtil::DataFormatToStr(outconfig.format));
for (enum AEDataFormat i = AE_FMT_MAX; i > AE_FMT_INVALID; i = (enum AEDataFormat)((int)i - 1))
{
if (i == AE_FMT_RAW || i == AE_FMT_MAX)
continue;
if (m_passthrough && i != AE_FMT_S16BE && i != AE_FMT_S16LE)
continue;
fmt = AEFormatToALSAFormat(i);
if (fmt == SND_PCM_FORMAT_UNKNOWN || snd_pcm_hw_params_set_format(m_pcm, hw_params, fmt) < 0)
{
fmt = SND_PCM_FORMAT_UNKNOWN;
continue;
}
int fmtBits = CAEUtil::DataFormatToBits(i);
int bits = snd_pcm_hw_params_get_sbits(hw_params);
if (bits != fmtBits)
{
/* if we opened in 32bit and only have 24bits, signal it accordingly */
if (fmtBits == 32 && bits == 24)
i = AE_FMT_S24NE4MSB;
else
continue;
}
/* record that the format fell back to X */
outconfig.format = i;
CLog::Log(LOGINFO, "CAESinkALSA::InitializeHW - Using data format %s", CAEUtil::DataFormatToStr(outconfig.format));
break;
}
/* if we failed to find a valid output format */
if (fmt == SND_PCM_FORMAT_UNKNOWN)
{
CLog::Log(LOGERROR, "CAESinkALSA::InitializeHW - Unable to find a suitable output format");
return false;
}
}
snd_pcm_uframes_t periodSize, bufferSize;
snd_pcm_hw_params_get_buffer_size_max(hw_params, &bufferSize);
snd_pcm_hw_params_get_period_size_max(hw_params, &periodSize, NULL);
/*
We want to make sure, that we have max 200 ms Buffer with
a periodSize of approx 50 ms. Choosing a higher bufferSize
will cause problems with menu sounds. Buffer will be increased
after those are fixed.
*/
periodSize = std::min(periodSize, (snd_pcm_uframes_t) sampleRate / 20);
bufferSize = std::min(bufferSize, (snd_pcm_uframes_t) sampleRate / 5);
/*
According to upstream we should set buffer size first - so make sure it is always at least
4x period size to not get underruns (some systems seem to have issues with only 2 periods)
*/
periodSize = std::min(periodSize, bufferSize / 4);
CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Request: periodSize %lu, bufferSize %lu", periodSize, bufferSize);
snd_pcm_hw_params_t *hw_params_copy;
snd_pcm_hw_params_alloca(&hw_params_copy);
snd_pcm_hw_params_copy(hw_params_copy, hw_params); // copy what we have and is already working
// Make sure to not initialize too large to not cause underruns
snd_pcm_uframes_t periodSizeMax = bufferSize / 3;
if(snd_pcm_hw_params_set_period_size_max(m_pcm, hw_params_copy, &periodSizeMax, NULL) != 0)
{
snd_pcm_hw_params_copy(hw_params_copy, hw_params); // restore working copy
CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Request: Failed to limit periodSize to %lu", periodSizeMax);
}
// first trying bufferSize, PeriodSize
// for more info see here:
// http://mailman.alsa-project.org/pipermail/alsa-devel/2009-September/021069.html
// the last three tries are done as within pulseaudio
// backup periodSize and bufferSize first. Restore them after every failed try
snd_pcm_uframes_t periodSizeTemp, bufferSizeTemp;
periodSizeTemp = periodSize;
bufferSizeTemp = bufferSize;
if (snd_pcm_hw_params_set_buffer_size_near(m_pcm, hw_params_copy, &bufferSize) != 0
|| snd_pcm_hw_params_set_period_size_near(m_pcm, hw_params_copy, &periodSize, NULL) != 0
|| snd_pcm_hw_params(m_pcm, hw_params_copy) != 0)
{
bufferSize = bufferSizeTemp;
periodSize = periodSizeTemp;
// retry with PeriodSize, bufferSize
snd_pcm_hw_params_copy(hw_params_copy, hw_params); // restore working copy
if (snd_pcm_hw_params_set_period_size_near(m_pcm, hw_params_copy, &periodSize, NULL) != 0
|| snd_pcm_hw_params_set_buffer_size_near(m_pcm, hw_params_copy, &bufferSize) != 0
|| snd_pcm_hw_params(m_pcm, hw_params_copy) != 0)
{
// try only periodSize
periodSize = periodSizeTemp;
snd_pcm_hw_params_copy(hw_params_copy, hw_params); // restore working copy
if(snd_pcm_hw_params_set_period_size_near(m_pcm, hw_params_copy, &periodSize, NULL) != 0
|| snd_pcm_hw_params(m_pcm, hw_params_copy) != 0)
{
// try only BufferSize
bufferSize = bufferSizeTemp;
snd_pcm_hw_params_copy(hw_params_copy, hw_params); // restore working copy
if (snd_pcm_hw_params_set_buffer_size_near(m_pcm, hw_params_copy, &bufferSize) != 0
|| snd_pcm_hw_params(m_pcm, hw_params_copy) != 0)
{
// set default that Alsa would choose
CLog::Log(LOGWARNING, "CAESinkAlsa::InitializeHW - Using default alsa values - set failed");
if (snd_pcm_hw_params(m_pcm, hw_params) != 0)
{
CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Could not init a valid sink");
return false;
}
}
}
// reread values when alsa default was kept
snd_pcm_get_params(m_pcm, &bufferSize, &periodSize);
}
}
CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Got: periodSize %lu, bufferSize %lu", periodSize, bufferSize);
/* set the format parameters */
outconfig.sampleRate = sampleRate;
/* if periodSize is too small Audio Engine might starve */
m_fragmented = false;
unsigned int fragments = 1;
if (periodSize < AE_MIN_PERIODSIZE)
{
fragments = std::ceil((double) AE_MIN_PERIODSIZE / periodSize);
CLog::Log(LOGDEBUG, "Audio Driver reports too low periodSize %d - will use %d fragments", (int) periodSize, (int) fragments);
m_fragmented = true;
}
m_originalPeriodSize = periodSize;
outconfig.periodSize = fragments * periodSize;
outconfig.frameSize = snd_pcm_frames_to_bytes(m_pcm, 1);
m_bufferSize = (unsigned int)bufferSize;
m_timeout = std::ceil((double)(bufferSize * 1000) / (double)sampleRate);
CLog::Log(LOGDEBUG, "CAESinkALSA::InitializeHW - Setting timeout to %d ms", m_timeout);
return true;
}
bool CAESinkALSA::InitializeSW(const ALSAConfig &inconfig)
{
snd_pcm_sw_params_t *sw_params;
snd_pcm_uframes_t boundary;
snd_pcm_sw_params_alloca(&sw_params);
memset(sw_params, 0, snd_pcm_sw_params_sizeof());
snd_pcm_sw_params_current (m_pcm, sw_params);
snd_pcm_sw_params_set_start_threshold (m_pcm, sw_params, INT_MAX);
snd_pcm_sw_params_set_silence_threshold(m_pcm, sw_params, 0);
snd_pcm_sw_params_get_boundary (sw_params, &boundary);
snd_pcm_sw_params_set_silence_size (m_pcm, sw_params, boundary);
snd_pcm_sw_params_set_avail_min (m_pcm, sw_params, inconfig.periodSize);
if (snd_pcm_sw_params(m_pcm, sw_params) < 0)
{
CLog::Log(LOGERROR, "CAESinkALSA::InitializeSW - Failed to set the parameters");
return false;
}
return true;
}
void CAESinkALSA::Deinitialize()
{
if (m_pcm)
{
Stop();
snd_pcm_close(m_pcm);
m_pcm = NULL;
}
}
void CAESinkALSA::Stop()
{
if (!m_pcm)
return;
snd_pcm_drop(m_pcm);
}
void CAESinkALSA::GetDelay(AEDelayStatus& status)
{
if (!m_pcm)
{
status.SetDelay(0);
return;
}
snd_pcm_sframes_t frames = 0;
snd_pcm_delay(m_pcm, &frames);
if (frames < 0)
{
#if SND_LIB_VERSION >= 0x000901 /* snd_pcm_forward() exists since 0.9.0rc8 */
snd_pcm_forward(m_pcm, -frames);
#endif
frames = 0;
}
status.SetDelay((double)frames * m_formatSampleRateMul);
}
double CAESinkALSA::GetCacheTotal()
{
return (double)m_bufferSize * m_formatSampleRateMul;
}
unsigned int CAESinkALSA::AddPackets(uint8_t **data, unsigned int frames, unsigned int offset)
{
if (!m_pcm)
{
CLog::Log(LOGERROR, "CAESinkALSA - Tried to add packets without a sink");
return INT_MAX;
}
void *buffer = data[0]+offset*m_format.m_frameSize;
unsigned int amount = 0;
int64_t data_left = (int64_t) frames;
int frames_written = 0;
while (data_left > 0)
{
if (m_fragmented)
amount = std::min((unsigned int) data_left, m_originalPeriodSize);
else // take care as we can come here a second time if the sink does not eat all data
amount = (unsigned int) data_left;
int ret = snd_pcm_writei(m_pcm, buffer, amount);
if (ret < 0)
{
CLog::Log(LOGERROR, "CAESinkALSA - snd_pcm_writei(%d) %s - trying to recover", ret, snd_strerror(ret));
ret = snd_pcm_recover(m_pcm, ret, 1);
if(ret < 0)
{
HandleError("snd_pcm_writei(1)", ret);
ret = snd_pcm_writei(m_pcm, buffer, amount);
if (ret < 0)
{
HandleError("snd_pcm_writei(2)", ret);
ret = 0;
}
}
}
if ( ret > 0 && snd_pcm_state(m_pcm) == SND_PCM_STATE_PREPARED)
snd_pcm_start(m_pcm);
if (ret <= 0)
break;
frames_written += ret;
data_left -= ret;
buffer = data[0]+offset*m_format.m_frameSize + frames_written*m_format.m_frameSize;
}
return frames_written;
}
void CAESinkALSA::HandleError(const char* name, int err)
{
switch(err)
{
case -EPIPE:
CLog::Log(LOGERROR, "CAESinkALSA::HandleError(%s) - underrun", name);
if ((err = snd_pcm_prepare(m_pcm)) < 0)
CLog::Log(LOGERROR, "CAESinkALSA::HandleError(%s) - snd_pcm_prepare returned %d (%s)", name, err, snd_strerror(err));
break;
case -ESTRPIPE: