394 lines
13 KiB
C++
394 lines
13 KiB
C++
#include <cstring>
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#include <optional>
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#include <string_view>
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#include "CallDevices.h"
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#include "ChatPage.h"
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#include "Logging.h"
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#include "UserSettingsPage.h"
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#ifdef GSTREAMER_AVAILABLE
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extern "C"
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{
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#include "gst/gst.h"
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}
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#endif
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CallDevices::CallDevices()
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: QObject()
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{}
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#ifdef GSTREAMER_AVAILABLE
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namespace {
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struct AudioSource
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{
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std::string name;
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GstDevice *device;
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};
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struct VideoSource
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{
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struct Caps
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{
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std::string resolution;
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std::vector<std::string> frameRates;
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};
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std::string name;
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GstDevice *device;
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std::vector<Caps> caps;
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};
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std::vector<AudioSource> audioSources_;
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std::vector<VideoSource> videoSources_;
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using FrameRate = std::pair<int, int>;
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std::optional<FrameRate>
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getFrameRate(const GValue *value)
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{
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if (GST_VALUE_HOLDS_FRACTION(value)) {
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gint num = gst_value_get_fraction_numerator(value);
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gint den = gst_value_get_fraction_denominator(value);
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return FrameRate{num, den};
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}
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return std::nullopt;
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}
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void
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addFrameRate(std::vector<std::string> &rates, const FrameRate &rate)
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{
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constexpr double minimumFrameRate = 15.0;
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if (static_cast<double>(rate.first) / rate.second >= minimumFrameRate)
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rates.push_back(std::to_string(rate.first) + "/" + std::to_string(rate.second));
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}
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void
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setDefaultDevice(bool isVideo)
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{
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auto settings = ChatPage::instance()->userSettings();
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if (isVideo && settings->camera().isEmpty()) {
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const VideoSource &camera = videoSources_.front();
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settings->setCamera(QString::fromStdString(camera.name));
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settings->setCameraResolution(
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QString::fromStdString(camera.caps.front().resolution));
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settings->setCameraFrameRate(
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QString::fromStdString(camera.caps.front().frameRates.front()));
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} else if (!isVideo && settings->microphone().isEmpty()) {
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settings->setMicrophone(QString::fromStdString(audioSources_.front().name));
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}
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}
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void
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addDevice(GstDevice *device)
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{
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if (!device)
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return;
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gchar *name = gst_device_get_display_name(device);
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gchar *type = gst_device_get_device_class(device);
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bool isVideo = !std::strncmp(type, "Video", 5);
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g_free(type);
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nhlog::ui()->debug("WebRTC: {} device added: {}", isVideo ? "video" : "audio", name);
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if (!isVideo) {
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audioSources_.push_back({name, device});
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g_free(name);
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setDefaultDevice(false);
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return;
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}
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GstCaps *gstcaps = gst_device_get_caps(device);
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if (!gstcaps) {
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nhlog::ui()->debug("WebRTC: unable to get caps for {}", name);
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g_free(name);
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return;
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}
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VideoSource source{name, device, {}};
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g_free(name);
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guint nCaps = gst_caps_get_size(gstcaps);
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for (guint i = 0; i < nCaps; ++i) {
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GstStructure *structure = gst_caps_get_structure(gstcaps, i);
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const gchar *name = gst_structure_get_name(structure);
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if (!std::strcmp(name, "video/x-raw")) {
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gint widthpx, heightpx;
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if (gst_structure_get(structure,
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"width",
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G_TYPE_INT,
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&widthpx,
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"height",
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G_TYPE_INT,
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&heightpx,
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nullptr)) {
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VideoSource::Caps caps;
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caps.resolution =
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std::to_string(widthpx) + "x" + std::to_string(heightpx);
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const GValue *value =
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gst_structure_get_value(structure, "framerate");
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if (auto fr = getFrameRate(value); fr)
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addFrameRate(caps.frameRates, *fr);
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else if (GST_VALUE_HOLDS_FRACTION_RANGE(value)) {
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addFrameRate(
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caps.frameRates,
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*getFrameRate(gst_value_get_fraction_range_min(value)));
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addFrameRate(
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caps.frameRates,
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*getFrameRate(gst_value_get_fraction_range_max(value)));
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} else if (GST_VALUE_HOLDS_LIST(value)) {
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guint nRates = gst_value_list_get_size(value);
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for (guint j = 0; j < nRates; ++j) {
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const GValue *rate =
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gst_value_list_get_value(value, j);
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if (auto fr = getFrameRate(rate); fr)
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addFrameRate(caps.frameRates, *fr);
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}
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}
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if (!caps.frameRates.empty())
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source.caps.push_back(std::move(caps));
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}
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}
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}
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gst_caps_unref(gstcaps);
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videoSources_.push_back(std::move(source));
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setDefaultDevice(true);
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}
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template<typename T>
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bool
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removeDevice(T &sources, GstDevice *device, bool changed)
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{
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if (auto it = std::find_if(sources.begin(),
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sources.end(),
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[device](const auto &s) { return s.device == device; });
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it != sources.end()) {
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nhlog::ui()->debug(std::string("WebRTC: device ") +
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(changed ? "changed: " : "removed: ") + "{}",
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it->name);
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gst_object_unref(device);
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sources.erase(it);
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return true;
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}
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return false;
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}
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void
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removeDevice(GstDevice *device, bool changed)
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{
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if (device) {
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if (removeDevice(audioSources_, device, changed) ||
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removeDevice(videoSources_, device, changed))
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return;
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}
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}
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gboolean
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newBusMessage(GstBus *bus G_GNUC_UNUSED, GstMessage *msg, gpointer user_data G_GNUC_UNUSED)
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{
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switch (GST_MESSAGE_TYPE(msg)) {
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case GST_MESSAGE_DEVICE_ADDED: {
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GstDevice *device;
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gst_message_parse_device_added(msg, &device);
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addDevice(device);
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emit CallDevices::instance().devicesChanged();
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break;
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}
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case GST_MESSAGE_DEVICE_REMOVED: {
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GstDevice *device;
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gst_message_parse_device_removed(msg, &device);
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removeDevice(device, false);
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emit CallDevices::instance().devicesChanged();
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break;
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}
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case GST_MESSAGE_DEVICE_CHANGED: {
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GstDevice *device;
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GstDevice *oldDevice;
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gst_message_parse_device_changed(msg, &device, &oldDevice);
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removeDevice(oldDevice, true);
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addDevice(device);
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break;
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}
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default:
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break;
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}
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return TRUE;
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}
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template<typename T>
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std::vector<std::string>
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deviceNames(T &sources, const std::string &defaultDevice)
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{
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std::vector<std::string> ret;
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ret.reserve(sources.size());
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for (const auto &s : sources)
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ret.push_back(s.name);
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// move default device to top of the list
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if (auto it = std::find(ret.begin(), ret.end(), defaultDevice); it != ret.end())
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std::swap(ret.front(), *it);
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return ret;
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}
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std::optional<VideoSource>
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getVideoSource(const std::string &cameraName)
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{
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if (auto it = std::find_if(videoSources_.cbegin(),
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videoSources_.cend(),
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[&cameraName](const auto &s) { return s.name == cameraName; });
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it != videoSources_.cend()) {
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return *it;
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}
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return std::nullopt;
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}
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std::pair<int, int>
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tokenise(std::string_view str, char delim)
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{
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std::pair<int, int> ret;
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ret.first = std::atoi(str.data());
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auto pos = str.find_first_of(delim);
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ret.second = std::atoi(str.data() + pos + 1);
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return ret;
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}
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}
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void
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CallDevices::init()
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{
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static GstDeviceMonitor *monitor = nullptr;
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if (!monitor) {
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monitor = gst_device_monitor_new();
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GstCaps *caps = gst_caps_new_empty_simple("audio/x-raw");
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gst_device_monitor_add_filter(monitor, "Audio/Source", caps);
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gst_device_monitor_add_filter(monitor, "Audio/Duplex", caps);
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gst_caps_unref(caps);
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caps = gst_caps_new_empty_simple("video/x-raw");
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gst_device_monitor_add_filter(monitor, "Video/Source", caps);
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gst_device_monitor_add_filter(monitor, "Video/Duplex", caps);
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gst_caps_unref(caps);
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GstBus *bus = gst_device_monitor_get_bus(monitor);
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gst_bus_add_watch(bus, newBusMessage, nullptr);
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gst_object_unref(bus);
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if (!gst_device_monitor_start(monitor)) {
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nhlog::ui()->error("WebRTC: failed to start device monitor");
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return;
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}
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}
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}
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bool
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CallDevices::haveMic() const
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{
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return !audioSources_.empty();
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}
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bool
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CallDevices::haveCamera() const
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{
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return !videoSources_.empty();
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}
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std::vector<std::string>
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CallDevices::names(bool isVideo, const std::string &defaultDevice) const
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{
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return isVideo ? deviceNames(videoSources_, defaultDevice)
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: deviceNames(audioSources_, defaultDevice);
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}
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std::vector<std::string>
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CallDevices::resolutions(const std::string &cameraName) const
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{
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std::vector<std::string> ret;
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if (auto s = getVideoSource(cameraName); s) {
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ret.reserve(s->caps.size());
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for (const auto &c : s->caps)
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ret.push_back(c.resolution);
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}
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return ret;
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}
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std::vector<std::string>
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CallDevices::frameRates(const std::string &cameraName, const std::string &resolution) const
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{
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if (auto s = getVideoSource(cameraName); s) {
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if (auto it =
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std::find_if(s->caps.cbegin(),
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s->caps.cend(),
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[&](const auto &c) { return c.resolution == resolution; });
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it != s->caps.cend())
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return it->frameRates;
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}
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return {};
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}
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GstDevice *
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CallDevices::audioDevice() const
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{
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std::string name = ChatPage::instance()->userSettings()->microphone().toStdString();
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if (auto it = std::find_if(audioSources_.cbegin(),
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audioSources_.cend(),
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[&name](const auto &s) { return s.name == name; });
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it != audioSources_.cend()) {
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nhlog::ui()->debug("WebRTC: microphone: {}", name);
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return it->device;
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} else {
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nhlog::ui()->error("WebRTC: unknown microphone: {}", name);
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return nullptr;
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}
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}
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GstDevice *
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CallDevices::videoDevice(std::pair<int, int> &resolution, std::pair<int, int> &frameRate) const
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{
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auto settings = ChatPage::instance()->userSettings();
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std::string name = settings->camera().toStdString();
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if (auto s = getVideoSource(name); s) {
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nhlog::ui()->debug("WebRTC: camera: {}", name);
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resolution = tokenise(settings->cameraResolution().toStdString(), 'x');
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frameRate = tokenise(settings->cameraFrameRate().toStdString(), '/');
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nhlog::ui()->debug(
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"WebRTC: camera resolution: {}x{}", resolution.first, resolution.second);
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nhlog::ui()->debug(
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"WebRTC: camera frame rate: {}/{}", frameRate.first, frameRate.second);
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return s->device;
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} else {
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nhlog::ui()->error("WebRTC: unknown camera: {}", name);
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return nullptr;
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}
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}
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#else
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bool
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CallDevices::haveMic() const
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{
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return false;
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}
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bool
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CallDevices::haveCamera() const
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{
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return false;
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}
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std::vector<std::string>
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CallDevices::names(bool, const std::string &) const
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{
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return {};
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}
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std::vector<std::string>
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CallDevices::resolutions(const std::string &) const
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{
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return {};
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}
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std::vector<std::string>
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CallDevices::frameRates(const std::string &, const std::string &) const
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{
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return {};
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}
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#endif
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