src/legacy_capture_device.cpp

   1 /*
   2  * This file is part of the libsigrokflow project.
   3  *
   4  * Copyright (C) 2018 Martin Ling <martin-sigrok@earth.li>
   5  * Copyright (C) 2018 Uwe Hermann <uwe@hermann-uwe.de>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22 #include <libsigrokflow/legacy_capture_device.hpp>
  23 #include <functional>
  24 #include <memory>
  25 #include <stdexcept>
  26 #include <utility>
  27 #include <gstreamermm/private/element_p.h>
  28
  29 namespace Srf
  30 {
  31
  32 using std::move;
  33 using std::placeholders::_1;
  34 using std::placeholders::_2;
  35 using std::runtime_error;
  36 using std::shared_ptr;
  37 using std::static_pointer_cast;
  38
  39 #ifdef HAVE_LIBSIGROKCXX
  40 void LegacyCaptureDevice::class_init(Gst::ElementClass<LegacyCaptureDevice> *klass)
  41 {
  42         klass->set_metadata("sigrok legacy capture device",
  43                         "Source", "Wrapper for capture devices using legacy libsigrok APIs",
  44                         "Martin Ling");
  45
  46         klass->add_pad_template(Gst::PadTemplate::create(
  47                         "src",
  48                         Gst::PAD_SRC,
  49                         Gst::PAD_ALWAYS,
  50                         Gst::Caps::create_any()));
  51 }
  52
  53 bool LegacyCaptureDevice::register_element(Glib::RefPtr<Gst::Plugin> plugin)
  54 {
  55         Gst::ElementFactory::register_element(plugin, "sigrok_legacy_capture_device",
  56                         0, Gst::register_mm_type<LegacyCaptureDevice>(
  57                                 "sigrok_legacy_capture_device"));
  58
  59         return true;
  60 }
  61
  62 LegacyCaptureDevice::LegacyCaptureDevice(GstElement *gobj) :
  63         Glib::ObjectBase(typeid(LegacyCaptureDevice)),
  64         CaptureDevice(gobj)
  65 {
  66         add_pad(src_pad_ = Gst::Pad::create(get_pad_template("src"), "src"));
  67 }
  68
  69 Glib::RefPtr<LegacyCaptureDevice>LegacyCaptureDevice::create(
  70         shared_ptr<sigrok::HardwareDevice> libsigrok_device)
  71 {
  72         auto element = Gst::ElementFactory::create_element("sigrok_legacy_capture_device");
  73         if (!element)
  74                 throw runtime_error("Failed to create element - plugin not registered?");
  75         auto device = Glib::RefPtr<LegacyCaptureDevice>::cast_static(element);
  76         device->libsigrok_device_ = libsigrok_device;
  77
  78         return device;
  79 }
  80
  81 shared_ptr<sigrok::HardwareDevice> LegacyCaptureDevice::libsigrok_device()
  82 {
  83         return libsigrok_device_;
  84 }
  85
  86 Gst::StateChangeReturn LegacyCaptureDevice::change_state_vfunc(Gst::StateChange transition)
  87 {
  88         switch (transition) {
  89         case Gst::STATE_CHANGE_READY_TO_PAUSED:
  90                 return Gst::StateChangeReturn::STATE_CHANGE_NO_PREROLL;
  91         case Gst::STATE_CHANGE_PAUSED_TO_PLAYING:
  92                 task_ = Gst::Task::create(std::bind(&LegacyCaptureDevice::run, this));
  93                 task_->set_lock(mutex_);
  94                 src_pad_->set_active(true);
  95                 task_->start();
  96                 return Gst::STATE_CHANGE_SUCCESS;
  97         default:
  98                 return Gst::STATE_CHANGE_SUCCESS;
  99         }
 100 }
 101
 102 void LegacyCaptureDevice::datafeed_callback(
 103         shared_ptr<sigrok::Device> device,
 104         shared_ptr<sigrok::Packet> packet)
 105 {
 106         (void)device;
 107
 108         switch (packet->type()->id()) {
 109         case SR_DF_LOGIC: {
 110                 auto logic = static_pointer_cast<sigrok::Logic>(packet->payload());
 111                 auto mem = Gst::Memory::create(
 112                                 Gst::MEMORY_FLAG_READONLY,
 113                                 logic->data_pointer(),
 114                                 logic->data_length(),
 115                                 0,
 116                                 logic->data_length());
 117                 auto buf = Gst::Buffer::create();
 118                 buf->append_memory(move(mem));
 119                 src_pad_->push(move(buf));
 120                 break;
 121         }
 122         case SR_DF_END:
 123                 session_->stop();
 124                 src_pad_->push_event(Gst::EventEos::create());
 125                 break;
 126         default:
 127                 break;
 128         }
 129 }
 130
 131 void LegacyCaptureDevice::run()
 132 {
 133         session_ = libsigrok_device_->driver()->parent()->create_session();
 134         session_->add_device(libsigrok_device_);
 135         session_->add_datafeed_callback(bind(&LegacyCaptureDevice::datafeed_callback, this, _1, _2));
 136         session_->start();
 137         session_->run();
 138         task_->stop();
 139 }
 140 #endif
 141
 142 }