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superbuild/modules/openal-soft/Alc/backends/pipewire.cpp

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/**
* OpenAL cross platform audio library
* Copyright (C) 2010 by Chris Robinson
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
* Or go to http://www.gnu.org/copyleft/lgpl.html
*/
#include "config.h"
#include "pipewire.h"
#include <algorithm>
#include <atomic>
#include <cstring>
#include <cerrno>
#include <chrono>
#include <ctime>
#include <list>
#include <memory>
#include <mutex>
#include <stdint.h>
#include <type_traits>
#include <utility>
#include "albyte.h"
#include "alc/alconfig.h"
#include "almalloc.h"
#include "alnumeric.h"
#include "aloptional.h"
#include "alspan.h"
#include "alstring.h"
#include "core/devformat.h"
#include "core/device.h"
#include "core/helpers.h"
#include "core/logging.h"
#include "dynload.h"
#include "opthelpers.h"
#include "ringbuffer.h"
/* Ignore warnings caused by PipeWire headers (lots in standard C++ mode). GCC
* doesn't support ignoring -Weverything, so we have the list the individual
* warnings to ignore (and ignoring -Winline doesn't seem to work).
*/
_Pragma("GCC diagnostic push")
_Pragma("GCC diagnostic ignored \"-Wpedantic\"")
_Pragma("GCC diagnostic ignored \"-Wconversion\"")
_Pragma("GCC diagnostic ignored \"-Wfloat-conversion\"")
_Pragma("GCC diagnostic ignored \"-Wmissing-field-initializers\"")
_Pragma("GCC diagnostic ignored \"-Wunused-parameter\"")
_Pragma("GCC diagnostic ignored \"-Wold-style-cast\"")
_Pragma("GCC diagnostic ignored \"-Wsign-compare\"")
_Pragma("GCC diagnostic ignored \"-Winline\"")
_Pragma("GCC diagnostic ignored \"-Wpragmas\"")
_Pragma("GCC diagnostic ignored \"-Weverything\"")
#include "pipewire/pipewire.h"
#include "pipewire/extensions/metadata.h"
#include "spa/buffer/buffer.h"
#include "spa/param/audio/format-utils.h"
#include "spa/param/audio/raw.h"
#include "spa/param/param.h"
#include "spa/pod/builder.h"
#include "spa/utils/json.h"
namespace {
/* Wrap some nasty macros here too... */
template<typename ...Args>
auto ppw_core_add_listener(pw_core *core, Args&& ...args)
{ return pw_core_add_listener(core, std::forward<Args>(args)...); }
template<typename ...Args>
auto ppw_core_sync(pw_core *core, Args&& ...args)
{ return pw_core_sync(core, std::forward<Args>(args)...); }
template<typename ...Args>
auto ppw_registry_add_listener(pw_registry *reg, Args&& ...args)
{ return pw_registry_add_listener(reg, std::forward<Args>(args)...); }
template<typename ...Args>
auto ppw_node_add_listener(pw_node *node, Args&& ...args)
{ return pw_node_add_listener(node, std::forward<Args>(args)...); }
template<typename ...Args>
auto ppw_node_subscribe_params(pw_node *node, Args&& ...args)
{ return pw_node_subscribe_params(node, std::forward<Args>(args)...); }
template<typename ...Args>
auto ppw_metadata_add_listener(pw_metadata *mdata, Args&& ...args)
{ return pw_metadata_add_listener(mdata, std::forward<Args>(args)...); }
constexpr auto get_pod_type(const spa_pod *pod) noexcept
{ return SPA_POD_TYPE(pod); }
template<typename T>
constexpr auto get_pod_body(const spa_pod *pod, size_t count) noexcept
{ return al::span<T>{static_cast<T*>(SPA_POD_BODY(pod)), count}; }
template<typename T, size_t N>
constexpr auto get_pod_body(const spa_pod *pod) noexcept
{ return al::span<T,N>{static_cast<T*>(SPA_POD_BODY(pod)), N}; }
constexpr auto make_pod_builder(void *data, uint32_t size) noexcept
{ return SPA_POD_BUILDER_INIT(data, size); }
constexpr auto get_array_value_type(const spa_pod *pod) noexcept
{ return SPA_POD_ARRAY_VALUE_TYPE(pod); }
constexpr auto PwIdAny = PW_ID_ANY;
} // namespace
_Pragma("GCC diagnostic pop")
namespace {
/* Added in 0.3.33, but we currently only require 0.3.23. */
#ifndef PW_KEY_NODE_RATE
#define PW_KEY_NODE_RATE "node.rate"
#endif
using std::chrono::seconds;
using std::chrono::nanoseconds;
using uint = unsigned int;
constexpr char pwireDevice[] = "PipeWire Output";
constexpr char pwireInput[] = "PipeWire Input";
bool check_version(const char *version)
{
/* There doesn't seem to be a function to get the version as an integer, so
* instead we have to parse the string, which hopefully won't break in the
* future.
*/
int major{0}, minor{0}, revision{0};
int ret{sscanf(version, "%d.%d.%d", &major, &minor, &revision)};
if(ret == 3 && (major > PW_MAJOR || (major == PW_MAJOR && minor > PW_MINOR)
|| (major == PW_MAJOR && minor == PW_MINOR && revision >= PW_MICRO)))
return true;
return false;
}
#ifdef HAVE_DYNLOAD
#define PWIRE_FUNCS(MAGIC) \
MAGIC(pw_context_connect) \
MAGIC(pw_context_destroy) \
MAGIC(pw_context_new) \
MAGIC(pw_core_disconnect) \
MAGIC(pw_get_library_version) \
MAGIC(pw_init) \
MAGIC(pw_properties_free) \
MAGIC(pw_properties_new) \
MAGIC(pw_properties_set) \
MAGIC(pw_properties_setf) \
MAGIC(pw_proxy_add_object_listener) \
MAGIC(pw_proxy_destroy) \
MAGIC(pw_proxy_get_user_data) \
MAGIC(pw_stream_add_listener) \
MAGIC(pw_stream_connect) \
MAGIC(pw_stream_dequeue_buffer) \
MAGIC(pw_stream_destroy) \
MAGIC(pw_stream_get_state) \
MAGIC(pw_stream_new) \
MAGIC(pw_stream_queue_buffer) \
MAGIC(pw_stream_set_active) \
MAGIC(pw_thread_loop_new) \
MAGIC(pw_thread_loop_destroy) \
MAGIC(pw_thread_loop_get_loop) \
MAGIC(pw_thread_loop_start) \
MAGIC(pw_thread_loop_stop) \
MAGIC(pw_thread_loop_lock) \
MAGIC(pw_thread_loop_wait) \
MAGIC(pw_thread_loop_signal) \
MAGIC(pw_thread_loop_unlock)
#if PW_CHECK_VERSION(0,3,50)
#define PWIRE_FUNCS2(MAGIC) \
MAGIC(pw_stream_get_time_n)
#else
#define PWIRE_FUNCS2(MAGIC) \
MAGIC(pw_stream_get_time)
#endif
void *pwire_handle;
#define MAKE_FUNC(f) decltype(f) * p##f;
PWIRE_FUNCS(MAKE_FUNC)
PWIRE_FUNCS2(MAKE_FUNC)
#undef MAKE_FUNC
bool pwire_load()
{
if(pwire_handle)
return true;
static constexpr char pwire_library[] = "libpipewire-0.3.so.0";
std::string missing_funcs;
pwire_handle = LoadLib(pwire_library);
if(!pwire_handle)
{
WARN("Failed to load %s\n", pwire_library);
return false;
}
#define LOAD_FUNC(f) do { \
p##f = reinterpret_cast<decltype(p##f)>(GetSymbol(pwire_handle, #f)); \
if(p##f == nullptr) missing_funcs += "\n" #f; \
} while(0);
PWIRE_FUNCS(LOAD_FUNC)
PWIRE_FUNCS2(LOAD_FUNC)
#undef LOAD_FUNC
if(!missing_funcs.empty())
{
WARN("Missing expected functions:%s\n", missing_funcs.c_str());
CloseLib(pwire_handle);
pwire_handle = nullptr;
return false;
}
return true;
}
#ifndef IN_IDE_PARSER
#define pw_context_connect ppw_context_connect
#define pw_context_destroy ppw_context_destroy
#define pw_context_new ppw_context_new
#define pw_core_disconnect ppw_core_disconnect
#define pw_get_library_version ppw_get_library_version
#define pw_init ppw_init
#define pw_properties_free ppw_properties_free
#define pw_properties_new ppw_properties_new
#define pw_properties_set ppw_properties_set
#define pw_properties_setf ppw_properties_setf
#define pw_proxy_add_object_listener ppw_proxy_add_object_listener
#define pw_proxy_destroy ppw_proxy_destroy
#define pw_proxy_get_user_data ppw_proxy_get_user_data
#define pw_stream_add_listener ppw_stream_add_listener
#define pw_stream_connect ppw_stream_connect
#define pw_stream_dequeue_buffer ppw_stream_dequeue_buffer
#define pw_stream_destroy ppw_stream_destroy
#define pw_stream_get_state ppw_stream_get_state
#define pw_stream_new ppw_stream_new
#define pw_stream_queue_buffer ppw_stream_queue_buffer
#define pw_stream_set_active ppw_stream_set_active
#define pw_thread_loop_destroy ppw_thread_loop_destroy
#define pw_thread_loop_get_loop ppw_thread_loop_get_loop
#define pw_thread_loop_lock ppw_thread_loop_lock
#define pw_thread_loop_new ppw_thread_loop_new
#define pw_thread_loop_signal ppw_thread_loop_signal
#define pw_thread_loop_start ppw_thread_loop_start
#define pw_thread_loop_stop ppw_thread_loop_stop
#define pw_thread_loop_unlock ppw_thread_loop_unlock
#define pw_thread_loop_wait ppw_thread_loop_wait
#if PW_CHECK_VERSION(0,3,50)
#define pw_stream_get_time_n ppw_stream_get_time_n
#else
inline auto pw_stream_get_time_n(pw_stream *stream, pw_time *ptime, size_t /*size*/)
{ return ppw_stream_get_time(stream, ptime); }
#endif
#endif
#else
constexpr bool pwire_load() { return true; }
#endif
/* Helpers for retrieving values from params */
template<uint32_t T> struct PodInfo { };
template<>
struct PodInfo<SPA_TYPE_Int> {
using Type = int32_t;
static auto get_value(const spa_pod *pod, int32_t *val)
{ return spa_pod_get_int(pod, val); }
};
template<>
struct PodInfo<SPA_TYPE_Id> {
using Type = uint32_t;
static auto get_value(const spa_pod *pod, uint32_t *val)
{ return spa_pod_get_id(pod, val); }
};
template<uint32_t T>
using Pod_t = typename PodInfo<T>::Type;
template<uint32_t T>
al::span<const Pod_t<T>> get_array_span(const spa_pod *pod)
{
uint32_t nvals;
if(void *v{spa_pod_get_array(pod, &nvals)})
{
if(get_array_value_type(pod) == T)
return {static_cast<const Pod_t<T>*>(v), nvals};
}
return {};
}
template<uint32_t T>
al::optional<Pod_t<T>> get_value(const spa_pod *value)
{
Pod_t<T> val{};
if(PodInfo<T>::get_value(value, &val) == 0)
return val;
return al::nullopt;
}
/* Internally, PipeWire types "inherit" from each other, but this is hidden
* from the API and the caller is expected to C-style cast to inherited types
* as needed. It's also not made very clear what types a given type can be
* casted to. To make it a bit safer, this as() method allows casting pw_*
* types to known inherited types, generating a compile-time error for
* unexpected/invalid casts.
*/
template<typename To, typename From>
To as(From) noexcept = delete;
/* pw_proxy
* - pw_registry
* - pw_node
* - pw_metadata
*/
template<>
pw_proxy* as(pw_registry *reg) noexcept { return reinterpret_cast<pw_proxy*>(reg); }
template<>
pw_proxy* as(pw_node *node) noexcept { return reinterpret_cast<pw_proxy*>(node); }
template<>
pw_proxy* as(pw_metadata *mdata) noexcept { return reinterpret_cast<pw_proxy*>(mdata); }
struct PwContextDeleter {
void operator()(pw_context *context) const { pw_context_destroy(context); }
};
using PwContextPtr = std::unique_ptr<pw_context,PwContextDeleter>;
struct PwCoreDeleter {
void operator()(pw_core *core) const { pw_core_disconnect(core); }
};
using PwCorePtr = std::unique_ptr<pw_core,PwCoreDeleter>;
struct PwRegistryDeleter {
void operator()(pw_registry *reg) const { pw_proxy_destroy(as<pw_proxy*>(reg)); }
};
using PwRegistryPtr = std::unique_ptr<pw_registry,PwRegistryDeleter>;
struct PwNodeDeleter {
void operator()(pw_node *node) const { pw_proxy_destroy(as<pw_proxy*>(node)); }
};
using PwNodePtr = std::unique_ptr<pw_node,PwNodeDeleter>;
struct PwMetadataDeleter {
void operator()(pw_metadata *mdata) const { pw_proxy_destroy(as<pw_proxy*>(mdata)); }
};
using PwMetadataPtr = std::unique_ptr<pw_metadata,PwMetadataDeleter>;
struct PwStreamDeleter {
void operator()(pw_stream *stream) const { pw_stream_destroy(stream); }
};
using PwStreamPtr = std::unique_ptr<pw_stream,PwStreamDeleter>;
/* Enums for bitflags... again... *sigh* */
constexpr pw_stream_flags operator|(pw_stream_flags lhs, pw_stream_flags rhs) noexcept
{ return static_cast<pw_stream_flags>(lhs | std::underlying_type_t<pw_stream_flags>{rhs}); }
class ThreadMainloop {
pw_thread_loop *mLoop{};
public:
ThreadMainloop() = default;
ThreadMainloop(const ThreadMainloop&) = delete;
ThreadMainloop(ThreadMainloop&& rhs) noexcept : mLoop{rhs.mLoop} { rhs.mLoop = nullptr; }
explicit ThreadMainloop(pw_thread_loop *loop) noexcept : mLoop{loop} { }
~ThreadMainloop() { if(mLoop) pw_thread_loop_destroy(mLoop); }
ThreadMainloop& operator=(const ThreadMainloop&) = delete;
ThreadMainloop& operator=(ThreadMainloop&& rhs) noexcept
{ std::swap(mLoop, rhs.mLoop); return *this; }
ThreadMainloop& operator=(std::nullptr_t) noexcept
{
if(mLoop)
pw_thread_loop_destroy(mLoop);
mLoop = nullptr;
return *this;
}
explicit operator bool() const noexcept { return mLoop != nullptr; }
auto start() const { return pw_thread_loop_start(mLoop); }
auto stop() const { return pw_thread_loop_stop(mLoop); }
auto getLoop() const { return pw_thread_loop_get_loop(mLoop); }
auto lock() const { return pw_thread_loop_lock(mLoop); }
auto unlock() const { return pw_thread_loop_unlock(mLoop); }
auto signal(bool wait) const { return pw_thread_loop_signal(mLoop, wait); }
auto newContext(pw_properties *props=nullptr, size_t user_data_size=0)
{ return PwContextPtr{pw_context_new(getLoop(), props, user_data_size)}; }
static auto Create(const char *name, spa_dict *props=nullptr)
{ return ThreadMainloop{pw_thread_loop_new(name, props)}; }
friend struct MainloopUniqueLock;
};
struct MainloopUniqueLock : public std::unique_lock<ThreadMainloop> {
using std::unique_lock<ThreadMainloop>::unique_lock;
MainloopUniqueLock& operator=(MainloopUniqueLock&&) = default;
auto wait() const -> void
{ pw_thread_loop_wait(mutex()->mLoop); }
template<typename Predicate>
auto wait(Predicate done_waiting) const -> void
{ while(!done_waiting()) wait(); }
};
using MainloopLockGuard = std::lock_guard<ThreadMainloop>;
/* There's quite a mess here, but the purpose is to track active devices and
* their default formats, so playback devices can be configured to match. The
* device list is updated asynchronously, so it will have the latest list of
* devices provided by the server.
*/
struct NodeProxy;
struct MetadataProxy;
/* The global thread watching for global events. This particular class responds
* to objects being added to or removed from the registry.
*/
struct EventManager {
ThreadMainloop mLoop{};
PwContextPtr mContext{};
PwCorePtr mCore{};
PwRegistryPtr mRegistry{};
spa_hook mRegistryListener{};
spa_hook mCoreListener{};
/* A list of proxy objects watching for events about changes to objects in
* the registry.
*/
std::vector<NodeProxy*> mNodeList;
MetadataProxy *mDefaultMetadata{nullptr};
/* Initialization handling. When init() is called, mInitSeq is set to a
* SequenceID that marks the end of populating the registry. As objects of
* interest are found, events to parse them are generated and mInitSeq is
* updated with a newer ID. When mInitSeq stops being updated and the event
* corresponding to it is reached, mInitDone will be set to true.
*/
std::atomic<bool> mInitDone{false};
std::atomic<bool> mHasAudio{false};
int mInitSeq{};
bool init();
~EventManager();
void kill();
auto lock() const { return mLoop.lock(); }
auto unlock() const { return mLoop.unlock(); }
/**
* Waits for initialization to finish. The event manager must *NOT* be
* locked when calling this.
*/
void waitForInit()
{
if(unlikely(!mInitDone.load(std::memory_order_acquire)))
{
MainloopUniqueLock plock{mLoop};
plock.wait([this](){ return mInitDone.load(std::memory_order_acquire); });
}
}
/**
* Waits for audio support to be detected, or initialization to finish,
* whichever is first. Returns true if audio support was detected. The
* event manager must *NOT* be locked when calling this.
*/
bool waitForAudio()
{
MainloopUniqueLock plock{mLoop};
bool has_audio{};
plock.wait([this,&has_audio]()
{
has_audio = mHasAudio.load(std::memory_order_acquire);
return has_audio || mInitDone.load(std::memory_order_acquire);
});
return has_audio;
}
void syncInit()
{
/* If initialization isn't done, update the sequence ID so it won't
* complete until after currently scheduled events.
*/
if(!mInitDone.load(std::memory_order_relaxed))
mInitSeq = ppw_core_sync(mCore.get(), PW_ID_CORE, mInitSeq);
}
void addCallback(uint32_t id, uint32_t permissions, const char *type, uint32_t version,
const spa_dict *props);
static void addCallbackC(void *object, uint32_t id, uint32_t permissions, const char *type,
uint32_t version, const spa_dict *props)
{ static_cast<EventManager*>(object)->addCallback(id, permissions, type, version, props); }
void removeCallback(uint32_t id);
static void removeCallbackC(void *object, uint32_t id)
{ static_cast<EventManager*>(object)->removeCallback(id); }
static constexpr pw_registry_events CreateRegistryEvents()
{
pw_registry_events ret{};
ret.version = PW_VERSION_REGISTRY_EVENTS;
ret.global = &EventManager::addCallbackC;
ret.global_remove = &EventManager::removeCallbackC;
return ret;
}
void coreCallback(uint32_t id, int seq);
static void coreCallbackC(void *object, uint32_t id, int seq)
{ static_cast<EventManager*>(object)->coreCallback(id, seq); }
static constexpr pw_core_events CreateCoreEvents()
{
pw_core_events ret{};
ret.version = PW_VERSION_CORE_EVENTS;
ret.done = &EventManager::coreCallbackC;
return ret;
}
};
using EventWatcherUniqueLock = std::unique_lock<EventManager>;
using EventWatcherLockGuard = std::lock_guard<EventManager>;
EventManager gEventHandler;
/* Enumerated devices. This is updated asynchronously as the app runs, and the
* gEventHandler thread loop must be locked when accessing the list.
*/
enum class NodeType : unsigned char {
Sink, Source, Duplex
};
constexpr auto InvalidChannelConfig = DevFmtChannels(255);
struct DeviceNode {
std::string mName;
std::string mDevName;
uint32_t mId{};
NodeType mType{};
bool mIsHeadphones{};
bool mIs51Rear{};
uint mSampleRate{};
DevFmtChannels mChannels{InvalidChannelConfig};
static std::vector<DeviceNode> sList;
static DeviceNode &Add(uint32_t id);
static DeviceNode *Find(uint32_t id);
static void Remove(uint32_t id);
static std::vector<DeviceNode> &GetList() noexcept { return sList; }
void parseSampleRate(const spa_pod *value) noexcept;
void parsePositions(const spa_pod *value) noexcept;
void parseChannelCount(const spa_pod *value) noexcept;
};
std::vector<DeviceNode> DeviceNode::sList;
std::string DefaultSinkDevice;
std::string DefaultSourceDevice;
const char *AsString(NodeType type) noexcept
{
switch(type)
{
case NodeType::Sink: return "sink";
case NodeType::Source: return "source";
case NodeType::Duplex: return "duplex";
}
return "<unknown>";
}
DeviceNode &DeviceNode::Add(uint32_t id)
{
auto match_id = [id](DeviceNode &n) noexcept -> bool
{ return n.mId == id; };
/* If the node is already in the list, return the existing entry. */
auto match = std::find_if(sList.begin(), sList.end(), match_id);
if(match != sList.end()) return *match;
sList.emplace_back();
auto &n = sList.back();
n.mId = id;
return n;
}
DeviceNode *DeviceNode::Find(uint32_t id)
{
auto match_id = [id](DeviceNode &n) noexcept -> bool
{ return n.mId == id; };
auto match = std::find_if(sList.begin(), sList.end(), match_id);
if(match != sList.end()) return std::addressof(*match);
return nullptr;
}
void DeviceNode::Remove(uint32_t id)
{
auto match_id = [id](DeviceNode &n) noexcept -> bool
{
if(n.mId != id)
return false;
TRACE("Removing device \"%s\"\n", n.mDevName.c_str());
return true;
};
auto end = std::remove_if(sList.begin(), sList.end(), match_id);
sList.erase(end, sList.end());
}
const spa_audio_channel MonoMap[]{
SPA_AUDIO_CHANNEL_MONO
}, StereoMap[] {
SPA_AUDIO_CHANNEL_FL, SPA_AUDIO_CHANNEL_FR
}, QuadMap[]{
SPA_AUDIO_CHANNEL_FL, SPA_AUDIO_CHANNEL_FR, SPA_AUDIO_CHANNEL_RL, SPA_AUDIO_CHANNEL_RR
}, X51Map[]{
SPA_AUDIO_CHANNEL_FL, SPA_AUDIO_CHANNEL_FR, SPA_AUDIO_CHANNEL_FC, SPA_AUDIO_CHANNEL_LFE,
SPA_AUDIO_CHANNEL_SL, SPA_AUDIO_CHANNEL_SR
}, X51RearMap[]{
SPA_AUDIO_CHANNEL_FL, SPA_AUDIO_CHANNEL_FR, SPA_AUDIO_CHANNEL_FC, SPA_AUDIO_CHANNEL_LFE,
SPA_AUDIO_CHANNEL_RL, SPA_AUDIO_CHANNEL_RR
}, X61Map[]{
SPA_AUDIO_CHANNEL_FL, SPA_AUDIO_CHANNEL_FR, SPA_AUDIO_CHANNEL_FC, SPA_AUDIO_CHANNEL_LFE,
SPA_AUDIO_CHANNEL_RC, SPA_AUDIO_CHANNEL_SL, SPA_AUDIO_CHANNEL_SR
}, X71Map[]{
SPA_AUDIO_CHANNEL_FL, SPA_AUDIO_CHANNEL_FR, SPA_AUDIO_CHANNEL_FC, SPA_AUDIO_CHANNEL_LFE,
SPA_AUDIO_CHANNEL_RL, SPA_AUDIO_CHANNEL_RR, SPA_AUDIO_CHANNEL_SL, SPA_AUDIO_CHANNEL_SR
};
/**
* Checks if every channel in 'map1' exists in 'map0' (that is, map0 is equal
* to or a superset of map1).
*/
template<size_t N>
bool MatchChannelMap(const al::span<const uint32_t> map0, const spa_audio_channel (&map1)[N])
{
if(map0.size() < N)
return false;
for(const spa_audio_channel chid : map1)
{
if(std::find(map0.begin(), map0.end(), chid) == map0.end())
return false;
}
return true;
}
void DeviceNode::parseSampleRate(const spa_pod *value) noexcept
{
/* TODO: Can this be anything else? Long, Float, Double? */
uint32_t nvals{}, choiceType{};
value = spa_pod_get_values(value, &nvals, &choiceType);
const uint podType{get_pod_type(value)};
if(podType != SPA_TYPE_Int)
{
WARN("Unhandled sample rate POD type: %u\n", podType);
return;
}
if(choiceType == SPA_CHOICE_Range)
{
if(nvals != 3)
{
WARN("Unexpected SPA_CHOICE_Range count: %u\n", nvals);
return;
}
auto srates = get_pod_body<int32_t,3>(value);
/* [0] is the default, [1] is the min, and [2] is the max. */
TRACE("Device ID %u sample rate: %d (range: %d -> %d)\n", mId, srates[0], srates[1],
srates[2]);
mSampleRate = static_cast<uint>(clampi(srates[0], MIN_OUTPUT_RATE, MAX_OUTPUT_RATE));
return;
}
if(choiceType == SPA_CHOICE_Enum)
{
if(nvals == 0)
{
WARN("Unexpected SPA_CHOICE_Enum count: %u\n", nvals);
return;
}
auto srates = get_pod_body<int32_t>(value, nvals);
/* [0] is the default, [1...size()-1] are available selections. */
std::string others{(srates.size() > 1) ? std::to_string(srates[1]) : std::string{}};
for(size_t i{2};i < srates.size();++i)
{
others += ", ";
others += std::to_string(srates[i]);
}
TRACE("Device ID %u sample rate: %d (%s)\n", mId, srates[0], others.c_str());
/* Pick the first rate listed that's within the allowed range (default
* rate if possible).
*/
for(const auto &rate : srates)
{
if(rate >= MIN_OUTPUT_RATE && rate <= MAX_OUTPUT_RATE)
{
mSampleRate = static_cast<uint>(rate);
break;
}
}
return;
}
if(choiceType == SPA_CHOICE_None)
{
if(nvals != 1)
{
WARN("Unexpected SPA_CHOICE_None count: %u\n", nvals);
return;
}
auto srates = get_pod_body<int32_t,1>(value);
TRACE("Device ID %u sample rate: %d\n", mId, srates[0]);
mSampleRate = static_cast<uint>(clampi(srates[0], MIN_OUTPUT_RATE, MAX_OUTPUT_RATE));
return;
}
WARN("Unhandled sample rate choice type: %u\n", choiceType);
}
void DeviceNode::parsePositions(const spa_pod *value) noexcept
{
const auto chanmap = get_array_span<SPA_TYPE_Id>(value);
if(chanmap.empty()) return;
mIs51Rear = false;
if(MatchChannelMap(chanmap, X71Map))
mChannels = DevFmtX71;
else if(MatchChannelMap(chanmap, X61Map))
mChannels = DevFmtX61;
else if(MatchChannelMap(chanmap, X51Map))
mChannels = DevFmtX51;
else if(MatchChannelMap(chanmap, X51RearMap))
{
mChannels = DevFmtX51;
mIs51Rear = true;
}
else if(MatchChannelMap(chanmap, QuadMap))
mChannels = DevFmtQuad;
else if(MatchChannelMap(chanmap, StereoMap))
mChannels = DevFmtStereo;
else
mChannels = DevFmtMono;
TRACE("Device ID %u got %zu position%s for %s%s\n", mId, chanmap.size(),
(chanmap.size()==1)?"":"s", DevFmtChannelsString(mChannels), mIs51Rear?"(rear)":"");
}
void DeviceNode::parseChannelCount(const spa_pod *value) noexcept
{
/* As a fallback with just a channel count, just assume mono or stereo. */
const auto chancount = get_value<SPA_TYPE_Int>(value);
if(!chancount) return;
mIs51Rear = false;
if(*chancount >= 2)
mChannels = DevFmtStereo;
else if(*chancount >= 1)
mChannels = DevFmtMono;
TRACE("Device ID %u got %d channel%s for %s\n", mId, *chancount, (*chancount==1)?"":"s",
DevFmtChannelsString(mChannels));
}
constexpr char MonitorPrefix[]{"Monitor of "};
constexpr auto MonitorPrefixLen = al::size(MonitorPrefix) - 1;
constexpr char AudioSinkClass[]{"Audio/Sink"};
constexpr char AudioSourceClass[]{"Audio/Source"};
constexpr char AudioDuplexClass[]{"Audio/Duplex"};
constexpr char StreamClass[]{"Stream/"};
/* A generic PipeWire node proxy object used to track changes to sink and
* source nodes.
*/
struct NodeProxy {
static constexpr pw_node_events CreateNodeEvents()
{
pw_node_events ret{};
ret.version = PW_VERSION_NODE_EVENTS;
ret.info = &NodeProxy::infoCallbackC;
ret.param = &NodeProxy::paramCallbackC;
return ret;
}
uint32_t mId{};
PwNodePtr mNode{};
spa_hook mListener{};
NodeProxy(uint32_t id, PwNodePtr node)
: mId{id}, mNode{std::move(node)}
{
static constexpr pw_node_events nodeEvents{CreateNodeEvents()};
ppw_node_add_listener(mNode.get(), &mListener, &nodeEvents, this);
/* Track changes to the enumerable formats (indicates the default
* format, which is what we're interested in).
*/
uint32_t fmtids[]{SPA_PARAM_EnumFormat};
ppw_node_subscribe_params(mNode.get(), al::data(fmtids), al::size(fmtids));
}
~NodeProxy()
{ spa_hook_remove(&mListener); }
void infoCallback(const pw_node_info *info);
static void infoCallbackC(void *object, const pw_node_info *info)
{ static_cast<NodeProxy*>(object)->infoCallback(info); }
void paramCallback(int seq, uint32_t id, uint32_t index, uint32_t next, const spa_pod *param);
static void paramCallbackC(void *object, int seq, uint32_t id, uint32_t index, uint32_t next,
const spa_pod *param)
{ static_cast<NodeProxy*>(object)->paramCallback(seq, id, index, next, param); }
};
void NodeProxy::infoCallback(const pw_node_info *info)
{
/* We only care about property changes here (media class, name/desc).
* Format changes will automatically invoke the param callback.
*
* TODO: Can the media class or name/desc change without being removed and
* readded?
*/
if((info->change_mask&PW_NODE_CHANGE_MASK_PROPS))
{
/* Can this actually change? */
const char *media_class{spa_dict_lookup(info->props, PW_KEY_MEDIA_CLASS)};
if(unlikely(!media_class)) return;
NodeType ntype{};
if(al::strcasecmp(media_class, AudioSinkClass) == 0)
ntype = NodeType::Sink;
else if(al::strcasecmp(media_class, AudioSourceClass) == 0)
ntype = NodeType::Source;
else if(al::strcasecmp(media_class, AudioDuplexClass) == 0)
ntype = NodeType::Duplex;
else
{
TRACE("Dropping device node %u which became type \"%s\"\n", info->id, media_class);
DeviceNode::Remove(info->id);
return;
}
const char *devName{spa_dict_lookup(info->props, PW_KEY_NODE_NAME)};
const char *nodeName{spa_dict_lookup(info->props, PW_KEY_NODE_DESCRIPTION)};
if(!nodeName || !*nodeName) nodeName = spa_dict_lookup(info->props, PW_KEY_NODE_NICK);
if(!nodeName || !*nodeName) nodeName = devName;
const char *form_factor{spa_dict_lookup(info->props, PW_KEY_DEVICE_FORM_FACTOR)};
TRACE("Got %s device \"%s\"%s%s%s\n", AsString(ntype), devName ? devName : "(nil)",
form_factor?" (":"", form_factor?form_factor:"", form_factor?")":"");
TRACE(" \"%s\" = ID %u\n", nodeName ? nodeName : "(nil)", info->id);
DeviceNode &node = DeviceNode::Add(info->id);
if(nodeName && *nodeName) node.mName = nodeName;
else node.mName = "PipeWire node #"+std::to_string(info->id);
node.mDevName = devName ? devName : "";
node.mType = ntype;
node.mIsHeadphones = form_factor && (al::strcasecmp(form_factor, "headphones") == 0
|| al::strcasecmp(form_factor, "headset") == 0);
}
}
void NodeProxy::paramCallback(int, uint32_t id, uint32_t, uint32_t, const spa_pod *param)
{
if(id == SPA_PARAM_EnumFormat)
{
DeviceNode *node{DeviceNode::Find(mId)};
if(unlikely(!node)) return;
if(const spa_pod_prop *prop{spa_pod_find_prop(param, nullptr, SPA_FORMAT_AUDIO_rate)})
node->parseSampleRate(&prop->value);
if(const spa_pod_prop *prop{spa_pod_find_prop(param, nullptr, SPA_FORMAT_AUDIO_position)})
node->parsePositions(&prop->value);
else if((prop=spa_pod_find_prop(param, nullptr, SPA_FORMAT_AUDIO_channels)) != nullptr)
node->parseChannelCount(&prop->value);
}
}
/* A metadata proxy object used to query the default sink and source. */
struct MetadataProxy {
static constexpr pw_metadata_events CreateMetadataEvents()
{
pw_metadata_events ret{};
ret.version = PW_VERSION_METADATA_EVENTS;
ret.property = &MetadataProxy::propertyCallbackC;
return ret;
}
uint32_t mId{};
PwMetadataPtr mMetadata{};
spa_hook mListener{};
MetadataProxy(uint32_t id, PwMetadataPtr mdata)
: mId{id}, mMetadata{std::move(mdata)}
{
static constexpr pw_metadata_events metadataEvents{CreateMetadataEvents()};
ppw_metadata_add_listener(mMetadata.get(), &mListener, &metadataEvents, this);
}
~MetadataProxy()
{ spa_hook_remove(&mListener); }
int propertyCallback(uint32_t id, const char *key, const char *type, const char *value);
static int propertyCallbackC(void *object, uint32_t id, const char *key, const char *type,
const char *value)
{ return static_cast<MetadataProxy*>(object)->propertyCallback(id, key, type, value); }
};
int MetadataProxy::propertyCallback(uint32_t id, const char *key, const char *type,
const char *value)
{
if(id != PW_ID_CORE)
return 0;
bool isCapture{};
if(std::strcmp(key, "default.audio.sink") == 0)
isCapture = false;
else if(std::strcmp(key, "default.audio.source") == 0)
isCapture = true;
else
return 0;
if(!type)
{
TRACE("Default %s device cleared\n", isCapture ? "capture" : "playback");
if(!isCapture) DefaultSinkDevice.clear();
else DefaultSourceDevice.clear();
return 0;
}
if(std::strcmp(type, "Spa:String:JSON") != 0)
{
ERR("Unexpected %s property type: %s\n", key, type);
return 0;
}
spa_json it[2]{};
spa_json_init(&it[0], value, strlen(value));
if(spa_json_enter_object(&it[0], &it[1]) <= 0)
return 0;
auto get_json_string = [](spa_json *iter)
{
al::optional<std::string> str;
const char *val{};
int len{spa_json_next(iter, &val)};
if(len <= 0) return str;
str.emplace().resize(static_cast<uint>(len), '\0');
if(spa_json_parse_string(val, len, &str->front()) <= 0)
str.reset();
else while(!str->empty() && str->back() == '\0')
str->pop_back();
return str;
};
while(auto propKey = get_json_string(&it[1]))
{
if(*propKey == "name")
{
auto propValue = get_json_string(&it[1]);
if(!propValue) break;
TRACE("Got default %s device \"%s\"\n", isCapture ? "capture" : "playback",
propValue->c_str());
if(!isCapture)
DefaultSinkDevice = std::move(*propValue);
else
DefaultSourceDevice = std::move(*propValue);
}
else
{
const char *v{};
if(spa_json_next(&it[1], &v) <= 0)
break;
}
}
return 0;
}
bool EventManager::init()
{
mLoop = ThreadMainloop::Create("PWEventThread");
if(!mLoop)
{
ERR("Failed to create PipeWire event thread loop (errno: %d)\n", errno);
return false;
}
mContext = mLoop.newContext(pw_properties_new(PW_KEY_CONFIG_NAME, "client-rt.conf", nullptr));
if(!mContext)
{
ERR("Failed to create PipeWire event context (errno: %d)\n", errno);
return false;
}
mCore = PwCorePtr{pw_context_connect(mContext.get(), nullptr, 0)};
if(!mCore)
{
ERR("Failed to connect PipeWire event context (errno: %d)\n", errno);
return false;
}
mRegistry = PwRegistryPtr{pw_core_get_registry(mCore.get(), PW_VERSION_REGISTRY, 0)};
if(!mRegistry)
{
ERR("Failed to get PipeWire event registry (errno: %d)\n", errno);
return false;
}
static constexpr pw_core_events coreEvents{CreateCoreEvents()};
static constexpr pw_registry_events registryEvents{CreateRegistryEvents()};
ppw_core_add_listener(mCore.get(), &mCoreListener, &coreEvents, this);
ppw_registry_add_listener(mRegistry.get(), &mRegistryListener, &registryEvents, this);
/* Set an initial sequence ID for initialization, to trigger after the
* registry is first populated.
*/
mInitSeq = ppw_core_sync(mCore.get(), PW_ID_CORE, 0);
if(int res{mLoop.start()})
{
ERR("Failed to start PipeWire event thread loop (res: %d)\n", res);
return false;
}
return true;
}
EventManager::~EventManager()
{
if(mLoop) mLoop.stop();
for(NodeProxy *node : mNodeList)
al::destroy_at(node);
if(mDefaultMetadata)
al::destroy_at(mDefaultMetadata);
}
void EventManager::kill()
{
if(mLoop) mLoop.stop();
for(NodeProxy *node : mNodeList)
al::destroy_at(node);
mNodeList.clear();
if(mDefaultMetadata)
al::destroy_at(mDefaultMetadata);
mDefaultMetadata = nullptr;
mRegistry = nullptr;
mCore = nullptr;
mContext = nullptr;
mLoop = nullptr;
}
void EventManager::addCallback(uint32_t id, uint32_t, const char *type, uint32_t version,
const spa_dict *props)
{
/* We're only interested in interface nodes. */
if(std::strcmp(type, PW_TYPE_INTERFACE_Node) == 0)
{
const char *media_class{spa_dict_lookup(props, PW_KEY_MEDIA_CLASS)};
if(!media_class) return;
/* Specifically, audio sinks and sources (and duplexes). */
const bool isGood{al::strcasecmp(media_class, AudioSinkClass) == 0
|| al::strcasecmp(media_class, AudioSourceClass) == 0
|| al::strcasecmp(media_class, AudioDuplexClass) == 0};
if(!isGood)
{
if(std::strstr(media_class, "/Video") == nullptr
&& std::strncmp(media_class, StreamClass, sizeof(StreamClass)-1) != 0)
TRACE("Ignoring node class %s\n", media_class);
return;
}
/* Create the proxy object. */
auto node = PwNodePtr{static_cast<pw_node*>(pw_registry_bind(mRegistry.get(), id, type,
version, sizeof(NodeProxy)))};
if(!node)
{
ERR("Failed to create node proxy object (errno: %d)\n", errno);
return;
}
/* Initialize the NodeProxy to hold the node object, add it to the
* active node list, and update the sync point.
*/
auto *proxy = static_cast<NodeProxy*>(pw_proxy_get_user_data(as<pw_proxy*>(node.get())));
mNodeList.emplace_back(al::construct_at(proxy, id, std::move(node)));
syncInit();
/* Signal any waiters that we have found a source or sink for audio
* support.
*/
if(!mHasAudio.exchange(true, std::memory_order_acq_rel))
mLoop.signal(false);
}
else if(std::strcmp(type, PW_TYPE_INTERFACE_Metadata) == 0)
{
const char *data_class{spa_dict_lookup(props, PW_KEY_METADATA_NAME)};
if(!data_class) return;
if(std::strcmp(data_class, "default") != 0)
{
TRACE("Ignoring metadata \"%s\"\n", data_class);
return;
}
if(mDefaultMetadata)
{
ERR("Duplicate default metadata\n");
return;
}
auto mdata = PwMetadataPtr{static_cast<pw_metadata*>(pw_registry_bind(mRegistry.get(), id,
type, version, sizeof(MetadataProxy)))};
if(!mdata)
{
ERR("Failed to create metadata proxy object (errno: %d)\n", errno);
return;
}
auto *proxy = static_cast<MetadataProxy*>(
pw_proxy_get_user_data(as<pw_proxy*>(mdata.get())));
mDefaultMetadata = al::construct_at(proxy, id, std::move(mdata));
syncInit();
}
}
void EventManager::removeCallback(uint32_t id)
{
DeviceNode::Remove(id);
auto clear_node = [id](NodeProxy *node) noexcept
{
if(node->mId != id)
return false;
al::destroy_at(node);
return true;
};
auto node_end = std::remove_if(mNodeList.begin(), mNodeList.end(), clear_node);
mNodeList.erase(node_end, mNodeList.end());
if(mDefaultMetadata && mDefaultMetadata->mId == id)
{
al::destroy_at(mDefaultMetadata);
mDefaultMetadata = nullptr;
}
}
void EventManager::coreCallback(uint32_t id, int seq)
{
if(id == PW_ID_CORE && seq == mInitSeq)
{
/* Initialization done. Remove this callback and signal anyone that may
* be waiting.
*/
spa_hook_remove(&mCoreListener);
mInitDone.store(true);
mLoop.signal(false);
}
}
enum use_f32p_e : bool { UseDevType=false, ForceF32Planar=true };
spa_audio_info_raw make_spa_info(DeviceBase *device, bool is51rear, use_f32p_e use_f32p)
{
spa_audio_info_raw info{};
if(use_f32p)
{
device->FmtType = DevFmtFloat;
info.format = SPA_AUDIO_FORMAT_F32P;
}
else switch(device->FmtType)
{
case DevFmtByte: info.format = SPA_AUDIO_FORMAT_S8; break;
case DevFmtUByte: info.format = SPA_AUDIO_FORMAT_U8; break;
case DevFmtShort: info.format = SPA_AUDIO_FORMAT_S16; break;
case DevFmtUShort: info.format = SPA_AUDIO_FORMAT_U16; break;
case DevFmtInt: info.format = SPA_AUDIO_FORMAT_S32; break;
case DevFmtUInt: info.format = SPA_AUDIO_FORMAT_U32; break;
case DevFmtFloat: info.format = SPA_AUDIO_FORMAT_F32; break;
}
info.rate = device->Frequency;
al::span<const spa_audio_channel> map{};
switch(device->FmtChans)
{
case DevFmtMono: map = MonoMap; break;
case DevFmtStereo: map = StereoMap; break;
case DevFmtQuad: map = QuadMap; break;
case DevFmtX51:
if(is51rear) map = X51RearMap;
else map = X51Map;
break;
case DevFmtX61: map = X61Map; break;
case DevFmtX71: map = X71Map; break;
case DevFmtX3D71: map = X71Map; break;
case DevFmtAmbi3D:
info.flags |= SPA_AUDIO_FLAG_UNPOSITIONED;
info.channels = device->channelsFromFmt();
break;
}
if(!map.empty())
{
info.channels = static_cast<uint32_t>(map.size());
std::copy(map.begin(), map.end(), info.position);
}
return info;
}
class PipeWirePlayback final : public BackendBase {
void stateChangedCallback(pw_stream_state old, pw_stream_state state, const char *error);
static void stateChangedCallbackC(void *data, pw_stream_state old, pw_stream_state state,
const char *error)
{ static_cast<PipeWirePlayback*>(data)->stateChangedCallback(old, state, error); }
void ioChangedCallback(uint32_t id, void *area, uint32_t size);
static void ioChangedCallbackC(void *data, uint32_t id, void *area, uint32_t size)
{ static_cast<PipeWirePlayback*>(data)->ioChangedCallback(id, area, size); }
void outputCallback();
static void outputCallbackC(void *data)
{ static_cast<PipeWirePlayback*>(data)->outputCallback(); }
void open(const char *name) override;
bool reset() override;
void start() override;
void stop() override;
ClockLatency getClockLatency() override;
uint32_t mTargetId{PwIdAny};
nanoseconds mTimeBase{0};
ThreadMainloop mLoop;
PwContextPtr mContext;
PwCorePtr mCore;
PwStreamPtr mStream;
spa_hook mStreamListener{};
spa_io_rate_match *mRateMatch{};
std::unique_ptr<float*[]> mChannelPtrs;
uint mNumChannels{};
static constexpr pw_stream_events CreateEvents()
{
pw_stream_events ret{};
ret.version = PW_VERSION_STREAM_EVENTS;
ret.state_changed = &PipeWirePlayback::stateChangedCallbackC;
ret.io_changed = &PipeWirePlayback::ioChangedCallbackC;
ret.process = &PipeWirePlayback::outputCallbackC;
return ret;
}
public:
PipeWirePlayback(DeviceBase *device) noexcept : BackendBase{device} { }
~PipeWirePlayback()
{
/* Stop the mainloop so the stream can be properly destroyed. */
if(mLoop) mLoop.stop();
}
DEF_NEWDEL(PipeWirePlayback)
};
void PipeWirePlayback::stateChangedCallback(pw_stream_state, pw_stream_state, const char*)
{ mLoop.signal(false); }
void PipeWirePlayback::ioChangedCallback(uint32_t id, void *area, uint32_t size)
{
switch(id)
{
case SPA_IO_RateMatch:
if(size >= sizeof(spa_io_rate_match))
mRateMatch = static_cast<spa_io_rate_match*>(area);
break;
}
}
void PipeWirePlayback::outputCallback()
{
pw_buffer *pw_buf{pw_stream_dequeue_buffer(mStream.get())};
if(unlikely(!pw_buf)) return;
const al::span<spa_data> datas{pw_buf->buffer->datas,
minu(mNumChannels, pw_buf->buffer->n_datas)};
#if PW_CHECK_VERSION(0,3,49)
/* In 0.3.49, pw_buffer::requested specifies the number of samples needed
* by the resampler/graph for this audio update.
*/
uint length{static_cast<uint>(pw_buf->requested)};
#else
/* In 0.3.48 and earlier, spa_io_rate_match::size apparently has the number
* of samples per update.
*/
uint length{mRateMatch ? mRateMatch->size : 0u};
#endif
/* If no length is specified, use the device's update size as a fallback. */
if(unlikely(!length)) length = mDevice->UpdateSize;
/* For planar formats, each datas[] seems to contain one channel, so store
* the pointers in an array. Limit the render length in case the available
* buffer length in any one channel is smaller than we wanted (shouldn't
* be, but just in case).
*/
float **chanptr_end{mChannelPtrs.get()};
for(const auto &data : datas)
{
length = minu(length, data.maxsize/sizeof(float));
*chanptr_end = static_cast<float*>(data.data);
++chanptr_end;
}
mDevice->renderSamples({mChannelPtrs.get(), chanptr_end}, length);
for(const auto &data : datas)
{
data.chunk->offset = 0;
data.chunk->stride = sizeof(float);
data.chunk->size = length * sizeof(float);
}
pw_buf->size = length;
pw_stream_queue_buffer(mStream.get(), pw_buf);
}
void PipeWirePlayback::open(const char *name)
{
static std::atomic<uint> OpenCount{0};
uint32_t targetid{PwIdAny};
std::string devname{};
gEventHandler.waitForInit();
if(!name)
{
EventWatcherLockGuard _{gEventHandler};
auto&& devlist = DeviceNode::GetList();
auto match = devlist.cend();
if(!DefaultSinkDevice.empty())
{
auto match_default = [](const DeviceNode &n) -> bool
{ return n.mDevName == DefaultSinkDevice; };
match = std::find_if(devlist.cbegin(), devlist.cend(), match_default);
}
if(match == devlist.cend())
{
auto match_playback = [](const DeviceNode &n) -> bool
{ return n.mType != NodeType::Source; };
match = std::find_if(devlist.cbegin(), devlist.cend(), match_playback);
if(match == devlist.cend())
throw al::backend_exception{al::backend_error::NoDevice,
"No PipeWire playback device found"};
}
targetid = match->mId;
devname = match->mName;
}
else
{
EventWatcherLockGuard _{gEventHandler};
auto&& devlist = DeviceNode::GetList();
auto match_name = [name](const DeviceNode &n) -> bool
{ return n.mType != NodeType::Source && n.mName == name; };
auto match = std::find_if(devlist.cbegin(), devlist.cend(), match_name);
if(match == devlist.cend())
throw al::backend_exception{al::backend_error::NoDevice,
"Device name \"%s\" not found", name};
targetid = match->mId;
devname = match->mName;
}
if(!mLoop)
{
const uint count{OpenCount.fetch_add(1, std::memory_order_relaxed)};
const std::string thread_name{"ALSoftP" + std::to_string(count)};
mLoop = ThreadMainloop::Create(thread_name.c_str());
if(!mLoop)
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to create PipeWire mainloop (errno: %d)", errno};
if(int res{mLoop.start()})
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to start PipeWire mainloop (res: %d)", res};
}
MainloopUniqueLock mlock{mLoop};
if(!mContext)
{
pw_properties *cprops{pw_properties_new(PW_KEY_CONFIG_NAME, "client-rt.conf", nullptr)};
mContext = mLoop.newContext(cprops);
if(!mContext)
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to create PipeWire event context (errno: %d)\n", errno};
}
if(!mCore)
{
mCore = PwCorePtr{pw_context_connect(mContext.get(), nullptr, 0)};
if(!mCore)
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to connect PipeWire event context (errno: %d)\n", errno};
}
mlock.unlock();
/* TODO: Ensure the target ID is still valid/usable and accepts streams. */
mTargetId = targetid;
if(!devname.empty())
mDevice->DeviceName = std::move(devname);
else
mDevice->DeviceName = pwireDevice;
}
bool PipeWirePlayback::reset()
{
if(mStream)
{
MainloopLockGuard _{mLoop};
mStream = nullptr;
}
mStreamListener = {};
mRateMatch = nullptr;
mTimeBase = GetDeviceClockTime(mDevice);
/* If connecting to a specific device, update various device parameters to
* match its format.
*/
bool is51rear{false};
mDevice->Flags.reset(DirectEar);
if(mTargetId != PwIdAny)
{
EventWatcherLockGuard _{gEventHandler};
auto&& devlist = DeviceNode::GetList();
auto match_id = [targetid=mTargetId](const DeviceNode &n) -> bool
{ return targetid == n.mId; };
auto match = std::find_if(devlist.cbegin(), devlist.cend(), match_id);
if(match != devlist.cend())
{
if(!mDevice->Flags.test(FrequencyRequest) && match->mSampleRate > 0)
{
/* Scale the update size if the sample rate changes. */
const double scale{static_cast<double>(match->mSampleRate) / mDevice->Frequency};
mDevice->Frequency = match->mSampleRate;
mDevice->UpdateSize = static_cast<uint>(clampd(mDevice->UpdateSize*scale + 0.5,
64.0, 8192.0));
mDevice->BufferSize = mDevice->UpdateSize * 2;
}
if(!mDevice->Flags.test(ChannelsRequest) && match->mChannels != InvalidChannelConfig)
mDevice->FmtChans = match->mChannels;
if(match->mChannels == DevFmtStereo && match->mIsHeadphones)
mDevice->Flags.set(DirectEar);
is51rear = match->mIs51Rear;
}
}
/* Force planar 32-bit float output for playback. This is what PipeWire
* handles internally, and it's easier for us too.
*/
spa_audio_info_raw info{make_spa_info(mDevice, is51rear, ForceF32Planar)};
/* TODO: How to tell what an appropriate size is? Examples just use this
* magic value.
*/
constexpr uint32_t pod_buffer_size{1024};
auto pod_buffer = std::make_unique<al::byte[]>(pod_buffer_size);
spa_pod_builder b{make_pod_builder(pod_buffer.get(), pod_buffer_size)};
const spa_pod *params{spa_format_audio_raw_build(&b, SPA_PARAM_EnumFormat, &info)};
if(!params)
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to set PipeWire audio format parameters"};
pw_properties *props{pw_properties_new(
PW_KEY_MEDIA_TYPE, "Audio",
PW_KEY_MEDIA_CATEGORY, "Playback",
PW_KEY_MEDIA_ROLE, "Game",
PW_KEY_NODE_ALWAYS_PROCESS, "true",
nullptr)};
if(!props)
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to create PipeWire stream properties (errno: %d)", errno};
auto&& binary = GetProcBinary();
const char *appname{binary.fname.length() ? binary.fname.c_str() : "OpenAL Soft"};
/* TODO: Which properties are actually needed here? Any others that could
* be useful?
*/
pw_properties_set(props, PW_KEY_NODE_NAME, appname);
pw_properties_set(props, PW_KEY_NODE_DESCRIPTION, appname);
pw_properties_setf(props, PW_KEY_NODE_LATENCY, "%u/%u", mDevice->UpdateSize,
mDevice->Frequency);
pw_properties_setf(props, PW_KEY_NODE_RATE, "1/%u", mDevice->Frequency);
MainloopUniqueLock plock{mLoop};
/* The stream takes overship of 'props', even in the case of failure. */
mStream = PwStreamPtr{pw_stream_new(mCore.get(), "Playback Stream", props)};
if(!mStream)
throw al::backend_exception{al::backend_error::NoDevice,
"Failed to create PipeWire stream (errno: %d)", errno};
static constexpr pw_stream_events streamEvents{CreateEvents()};
pw_stream_add_listener(mStream.get(), &mStreamListener, &streamEvents, this);
constexpr pw_stream_flags Flags{PW_STREAM_FLAG_AUTOCONNECT | PW_STREAM_FLAG_INACTIVE
| PW_STREAM_FLAG_MAP_BUFFERS | PW_STREAM_FLAG_RT_PROCESS};
if(int res{pw_stream_connect(mStream.get(), PW_DIRECTION_OUTPUT, mTargetId, Flags, &params, 1)})
throw al::backend_exception{al::backend_error::DeviceError,
"Error connecting PipeWire stream (res: %d)", res};
/* Wait for the stream to become paused (ready to start streaming). */
plock.wait([stream=mStream.get()]()
{
const char *error{};
pw_stream_state state{pw_stream_get_state(stream, &error)};
if(state == PW_STREAM_STATE_ERROR)
throw al::backend_exception{al::backend_error::DeviceError,
"Error connecting PipeWire stream: \"%s\"", error};
return state == PW_STREAM_STATE_PAUSED;
});
/* TODO: Update mDevice->BufferSize with the total known buffering delay
* from the head of this playback stream to the tail of the device output.
*/
mDevice->BufferSize = mDevice->UpdateSize * 2;
plock.unlock();
mNumChannels = mDevice->channelsFromFmt();
mChannelPtrs = std::make_unique<float*[]>(mNumChannels);
setDefaultWFXChannelOrder();
return true;
}
void PipeWirePlayback::start()
{
MainloopUniqueLock plock{mLoop};
if(int res{pw_stream_set_active(mStream.get(), true)})
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to start PipeWire stream (res: %d)", res};
/* Wait for the stream to start playing (would be nice to not, but we need
* the actual update size which is only available after starting).
*/
plock.wait([stream=mStream.get()]()
{
const char *error{};
pw_stream_state state{pw_stream_get_state(stream, &error)};
if(state == PW_STREAM_STATE_ERROR)
throw al::backend_exception{al::backend_error::DeviceError,
"PipeWire stream error: %s", error ? error : "(unknown)"};
return state == PW_STREAM_STATE_STREAMING;
});
if(mRateMatch && mRateMatch->size)
{
mDevice->UpdateSize = mRateMatch->size;
mDevice->BufferSize = mDevice->UpdateSize * 2;
}
}
void PipeWirePlayback::stop()
{
MainloopUniqueLock plock{mLoop};
if(int res{pw_stream_set_active(mStream.get(), false)})
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to stop PipeWire stream (res: %d)", res};
/* Wait for the stream to stop playing. */
plock.wait([stream=mStream.get()]()
{ return pw_stream_get_state(stream, nullptr) != PW_STREAM_STATE_STREAMING; });
}
ClockLatency PipeWirePlayback::getClockLatency()
{
/* Given a real-time low-latency output, this is rather complicated to get
* accurate timing. So, here we go.
*/
/* First, get the stream time info (tick delay, ticks played, and the
* CLOCK_MONOTONIC time closest to when that last tick was played).
*/
pw_time ptime{};
if(mStream)
{
MainloopLockGuard _{mLoop};
if(int res{pw_stream_get_time_n(mStream.get(), &ptime, sizeof(ptime))})
ERR("Failed to get PipeWire stream time (res: %d)\n", res);
}
/* Now get the mixer time and the CLOCK_MONOTONIC time atomically (i.e. the
* monotonic clock closest to 'now', and the last mixer time at 'now').
*/
nanoseconds mixtime{};
timespec tspec{};
uint refcount;
do {
refcount = mDevice->waitForMix();
mixtime = GetDeviceClockTime(mDevice);
clock_gettime(CLOCK_MONOTONIC, &tspec);
std::atomic_thread_fence(std::memory_order_acquire);
} while(refcount != ReadRef(mDevice->MixCount));
/* Convert the monotonic clock, stream ticks, and stream delay to
* nanoseconds.
*/
nanoseconds monoclock{seconds{tspec.tv_sec} + nanoseconds{tspec.tv_nsec}};
nanoseconds curtic{}, delay{};
if(unlikely(ptime.rate.denom < 1))
{
/* If there's no stream rate, the stream hasn't had a chance to get
* going and return time info yet. Just use dummy values.
*/
ptime.now = monoclock.count();
curtic = mixtime;
delay = nanoseconds{seconds{mDevice->BufferSize}} / mDevice->Frequency;
}
else
{
/* The stream gets recreated with each reset, so include the time that
* had already passed with previous streams.
*/
curtic = mTimeBase;
/* More safely scale the ticks to avoid overflowing the pre-division
* temporary as it gets larger.
*/
curtic += seconds{ptime.ticks / ptime.rate.denom} * ptime.rate.num;
curtic += nanoseconds{seconds{ptime.ticks%ptime.rate.denom} * ptime.rate.num} /
ptime.rate.denom;
/* The delay should be small enough to not worry about overflow. */
delay = nanoseconds{seconds{ptime.delay} * ptime.rate.num} / ptime.rate.denom;
}
/* If the mixer time is ahead of the stream time, there's that much more
* delay relative to the stream delay.
*/
if(mixtime > curtic)
delay += mixtime - curtic;
/* Reduce the delay according to how much time has passed since the known
* stream time. This isn't 100% accurate since the system monotonic clock
* doesn't tick at the exact same rate as the audio device, but it should
* be good enough with ptime.now being constantly updated every few
* milliseconds with ptime.ticks.
*/
delay -= monoclock - nanoseconds{ptime.now};
/* Return the mixer time and delay. Clamp the delay to no less than 0,
* incase timer drift got that severe.
*/
ClockLatency ret{};
ret.ClockTime = mixtime;
ret.Latency = std::max(delay, nanoseconds{});
return ret;
}
class PipeWireCapture final : public BackendBase {
void stateChangedCallback(pw_stream_state old, pw_stream_state state, const char *error);
static void stateChangedCallbackC(void *data, pw_stream_state old, pw_stream_state state,
const char *error)
{ static_cast<PipeWireCapture*>(data)->stateChangedCallback(old, state, error); }
void inputCallback();
static void inputCallbackC(void *data)
{ static_cast<PipeWireCapture*>(data)->inputCallback(); }
void open(const char *name) override;
void start() override;
void stop() override;
void captureSamples(al::byte *buffer, uint samples) override;
uint availableSamples() override;
uint32_t mTargetId{PwIdAny};
ThreadMainloop mLoop;
PwContextPtr mContext;
PwCorePtr mCore;
PwStreamPtr mStream;
spa_hook mStreamListener{};
RingBufferPtr mRing{};
static constexpr pw_stream_events CreateEvents()
{
pw_stream_events ret{};
ret.version = PW_VERSION_STREAM_EVENTS;
ret.state_changed = &PipeWireCapture::stateChangedCallbackC;
ret.process = &PipeWireCapture::inputCallbackC;
return ret;
}
public:
PipeWireCapture(DeviceBase *device) noexcept : BackendBase{device} { }
~PipeWireCapture() { if(mLoop) mLoop.stop(); }
DEF_NEWDEL(PipeWireCapture)
};
void PipeWireCapture::stateChangedCallback(pw_stream_state, pw_stream_state, const char*)
{ mLoop.signal(false); }
void PipeWireCapture::inputCallback()
{
pw_buffer *pw_buf{pw_stream_dequeue_buffer(mStream.get())};
if(unlikely(!pw_buf)) return;
spa_data *bufdata{pw_buf->buffer->datas};
const uint offset{minu(bufdata->chunk->offset, bufdata->maxsize)};
const uint size{minu(bufdata->chunk->size, bufdata->maxsize - offset)};
mRing->write(static_cast<char*>(bufdata->data) + offset, size / mRing->getElemSize());
pw_stream_queue_buffer(mStream.get(), pw_buf);
}
void PipeWireCapture::open(const char *name)
{
static std::atomic<uint> OpenCount{0};
uint32_t targetid{PwIdAny};
std::string devname{};
gEventHandler.waitForInit();
if(!name)
{
EventWatcherLockGuard _{gEventHandler};
auto&& devlist = DeviceNode::GetList();
auto match = devlist.cend();
if(!DefaultSourceDevice.empty())
{
auto match_default = [](const DeviceNode &n) -> bool
{ return n.mDevName == DefaultSourceDevice; };
match = std::find_if(devlist.cbegin(), devlist.cend(), match_default);
}
if(match == devlist.cend())
{
auto match_capture = [](const DeviceNode &n) -> bool
{ return n.mType != NodeType::Sink; };
match = std::find_if(devlist.cbegin(), devlist.cend(), match_capture);
}
if(match == devlist.cend())
{
match = devlist.cbegin();
if(match == devlist.cend())
throw al::backend_exception{al::backend_error::NoDevice,
"No PipeWire capture device found"};
}
targetid = match->mId;
if(match->mType != NodeType::Sink) devname = match->mName;
else devname = MonitorPrefix+match->mName;
}
else
{
EventWatcherLockGuard _{gEventHandler};
auto&& devlist = DeviceNode::GetList();
auto match_name = [name](const DeviceNode &n) -> bool
{ return n.mType != NodeType::Sink && n.mName == name; };
auto match = std::find_if(devlist.cbegin(), devlist.cend(), match_name);
if(match == devlist.cend() && std::strncmp(name, MonitorPrefix, MonitorPrefixLen) == 0)
{
const char *sinkname{name + MonitorPrefixLen};
auto match_sinkname = [sinkname](const DeviceNode &n) -> bool
{ return n.mType == NodeType::Sink && n.mName == sinkname; };
match = std::find_if(devlist.cbegin(), devlist.cend(), match_sinkname);
}
if(match == devlist.cend())
throw al::backend_exception{al::backend_error::NoDevice,
"Device name \"%s\" not found", name};
targetid = match->mId;
devname = name;
}
if(!mLoop)
{
const uint count{OpenCount.fetch_add(1, std::memory_order_relaxed)};
const std::string thread_name{"ALSoftC" + std::to_string(count)};
mLoop = ThreadMainloop::Create(thread_name.c_str());
if(!mLoop)
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to create PipeWire mainloop (errno: %d)", errno};
if(int res{mLoop.start()})
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to start PipeWire mainloop (res: %d)", res};
}
MainloopUniqueLock mlock{mLoop};
if(!mContext)
{
pw_properties *cprops{pw_properties_new(PW_KEY_CONFIG_NAME, "client-rt.conf", nullptr)};
mContext = mLoop.newContext(cprops);
if(!mContext)
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to create PipeWire event context (errno: %d)\n", errno};
}
if(!mCore)
{
mCore = PwCorePtr{pw_context_connect(mContext.get(), nullptr, 0)};
if(!mCore)
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to connect PipeWire event context (errno: %d)\n", errno};
}
mlock.unlock();
/* TODO: Ensure the target ID is still valid/usable and accepts streams. */
mTargetId = targetid;
if(!devname.empty())
mDevice->DeviceName = std::move(devname);
else
mDevice->DeviceName = pwireInput;
bool is51rear{false};
if(mTargetId != PwIdAny)
{
EventWatcherLockGuard _{gEventHandler};
auto&& devlist = DeviceNode::GetList();
auto match_id = [targetid=mTargetId](const DeviceNode &n) -> bool
{ return targetid == n.mId; };
auto match = std::find_if(devlist.cbegin(), devlist.cend(), match_id);
if(match != devlist.cend())
is51rear = match->mIs51Rear;
}
spa_audio_info_raw info{make_spa_info(mDevice, is51rear, UseDevType)};
constexpr uint32_t pod_buffer_size{1024};
auto pod_buffer = std::make_unique<al::byte[]>(pod_buffer_size);
spa_pod_builder b{make_pod_builder(pod_buffer.get(), pod_buffer_size)};
const spa_pod *params[]{spa_format_audio_raw_build(&b, SPA_PARAM_EnumFormat, &info)};
if(!params[0])
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to set PipeWire audio format parameters"};
pw_properties *props{pw_properties_new(
PW_KEY_MEDIA_TYPE, "Audio",
PW_KEY_MEDIA_CATEGORY, "Capture",
PW_KEY_MEDIA_ROLE, "Game",
PW_KEY_NODE_ALWAYS_PROCESS, "true",
nullptr)};
if(!props)
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to create PipeWire stream properties (errno: %d)", errno};
auto&& binary = GetProcBinary();
const char *appname{binary.fname.length() ? binary.fname.c_str() : "OpenAL Soft"};
pw_properties_set(props, PW_KEY_NODE_NAME, appname);
pw_properties_set(props, PW_KEY_NODE_DESCRIPTION, appname);
/* We don't actually care what the latency/update size is, as long as it's
* reasonable. Unfortunately, when unspecified PipeWire seems to default to
* around 40ms, which isn't great. So request 20ms instead.
*/
pw_properties_setf(props, PW_KEY_NODE_LATENCY, "%u/%u", (mDevice->Frequency+25) / 50,
mDevice->Frequency);
pw_properties_setf(props, PW_KEY_NODE_RATE, "1/%u", mDevice->Frequency);
MainloopUniqueLock plock{mLoop};
mStream = PwStreamPtr{pw_stream_new(mCore.get(), "Capture Stream", props)};
if(!mStream)
throw al::backend_exception{al::backend_error::NoDevice,
"Failed to create PipeWire stream (errno: %d)", errno};
static constexpr pw_stream_events streamEvents{CreateEvents()};
pw_stream_add_listener(mStream.get(), &mStreamListener, &streamEvents, this);
constexpr pw_stream_flags Flags{PW_STREAM_FLAG_AUTOCONNECT | PW_STREAM_FLAG_INACTIVE
| PW_STREAM_FLAG_MAP_BUFFERS | PW_STREAM_FLAG_RT_PROCESS};
if(int res{pw_stream_connect(mStream.get(), PW_DIRECTION_INPUT, mTargetId, Flags, params, 1)})
throw al::backend_exception{al::backend_error::DeviceError,
"Error connecting PipeWire stream (res: %d)", res};
/* Wait for the stream to become paused (ready to start streaming). */
plock.wait([stream=mStream.get()]()
{
const char *error{};
pw_stream_state state{pw_stream_get_state(stream, &error)};
if(state == PW_STREAM_STATE_ERROR)
throw al::backend_exception{al::backend_error::DeviceError,
"Error connecting PipeWire stream: \"%s\"", error};
return state == PW_STREAM_STATE_PAUSED;
});
plock.unlock();
setDefaultWFXChannelOrder();
/* Ensure at least a 100ms capture buffer. */
mRing = RingBuffer::Create(maxu(mDevice->Frequency/10, mDevice->BufferSize),
mDevice->frameSizeFromFmt(), false);
}
void PipeWireCapture::start()
{
MainloopUniqueLock plock{mLoop};
if(int res{pw_stream_set_active(mStream.get(), true)})
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to start PipeWire stream (res: %d)", res};
plock.wait([stream=mStream.get()]()
{
const char *error{};
pw_stream_state state{pw_stream_get_state(stream, &error)};
if(state == PW_STREAM_STATE_ERROR)
throw al::backend_exception{al::backend_error::DeviceError,
"PipeWire stream error: %s", error ? error : "(unknown)"};
return state == PW_STREAM_STATE_STREAMING;
});
}
void PipeWireCapture::stop()
{
MainloopUniqueLock plock{mLoop};
if(int res{pw_stream_set_active(mStream.get(), false)})
throw al::backend_exception{al::backend_error::DeviceError,
"Failed to stop PipeWire stream (res: %d)", res};
plock.wait([stream=mStream.get()]()
{ return pw_stream_get_state(stream, nullptr) != PW_STREAM_STATE_STREAMING; });
}
uint PipeWireCapture::availableSamples()
{ return static_cast<uint>(mRing->readSpace()); }
void PipeWireCapture::captureSamples(al::byte *buffer, uint samples)
{ mRing->read(buffer, samples); }
} // namespace
bool PipeWireBackendFactory::init()
{
if(!pwire_load())
return false;
const char *version{pw_get_library_version()};
if(!check_version(version))
{
WARN("PipeWire version \"%s\" too old (%s or newer required)\n", version,
pw_get_headers_version());
return false;
}
TRACE("Found PipeWire version \"%s\" (%s or newer)\n", version, pw_get_headers_version());
pw_init(0, nullptr);
if(!gEventHandler.init())
return false;
if(!GetConfigValueBool(nullptr, "pipewire", "assume-audio", false)
&& !gEventHandler.waitForAudio())
{
gEventHandler.kill();
/* TODO: Temporary warning, until PipeWire gets a proper way to report
* audio support.
*/
WARN("No audio support detected in PipeWire. See the PipeWire options in alsoftrc.sample if this is wrong.\n");
return false;
}
return true;
}
bool PipeWireBackendFactory::querySupport(BackendType type)
{ return type == BackendType::Playback || type == BackendType::Capture; }
std::string PipeWireBackendFactory::probe(BackendType type)
{
std::string outnames;
gEventHandler.waitForInit();
EventWatcherLockGuard _{gEventHandler};
auto&& devlist = DeviceNode::GetList();
auto match_defsink = [](const DeviceNode &n) -> bool
{ return n.mDevName == DefaultSinkDevice; };
auto match_defsource = [](const DeviceNode &n) -> bool
{ return n.mDevName == DefaultSourceDevice; };
auto sort_devnode = [](DeviceNode &lhs, DeviceNode &rhs) noexcept -> bool
{ return lhs.mId < rhs.mId; };
std::sort(devlist.begin(), devlist.end(), sort_devnode);
auto defmatch = devlist.cbegin();
switch(type)
{
case BackendType::Playback:
defmatch = std::find_if(defmatch, devlist.cend(), match_defsink);
if(defmatch != devlist.cend())
{
/* Includes null char. */
outnames.append(defmatch->mName.c_str(), defmatch->mName.length()+1);
}
for(auto iter = devlist.cbegin();iter != devlist.cend();++iter)
{
if(iter != defmatch && iter->mType != NodeType::Source)
outnames.append(iter->mName.c_str(), iter->mName.length()+1);
}
break;
case BackendType::Capture:
defmatch = std::find_if(defmatch, devlist.cend(), match_defsource);
if(defmatch != devlist.cend())
{
if(defmatch->mType == NodeType::Sink)
outnames.append(MonitorPrefix);
outnames.append(defmatch->mName.c_str(), defmatch->mName.length()+1);
}
for(auto iter = devlist.cbegin();iter != devlist.cend();++iter)
{
if(iter != defmatch)
{
if(iter->mType == NodeType::Sink)
outnames.append(MonitorPrefix);
outnames.append(iter->mName.c_str(), iter->mName.length()+1);
}
}
break;
}
return outnames;
}
BackendPtr PipeWireBackendFactory::createBackend(DeviceBase *device, BackendType type)
{
if(type == BackendType::Playback)
return BackendPtr{new PipeWirePlayback{device}};
if(type == BackendType::Capture)
return BackendPtr{new PipeWireCapture{device}};
return nullptr;
}
BackendFactory &PipeWireBackendFactory::getFactory()
{
static PipeWireBackendFactory factory{};
return factory;
}