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/libsigrokflow.hpp>
  23
  24 namespace Srf
  25 {
  26
  27 using namespace std;
  28 using namespace std::placeholders;
  29
  30 #ifdef HAVE_LIBSIGROKCXX
  31 void LegacyCaptureDevice::class_init(Gst::ElementClass<LegacyCaptureDevice> *klass)
  32 {
  33         klass->set_metadata("sigrok legacy capture device",
  34                         "Source", "Wrapper for capture devices using legacy libsigrok APIs",
  35                         "Martin Ling");
  36
  37         klass->add_pad_template(Gst::PadTemplate::create(
  38                         "src",
  39                         Gst::PAD_SRC,
  40                         Gst::PAD_ALWAYS,
  41                         Gst::Caps::create_any()));
  42 }
  43
  44 bool LegacyCaptureDevice::register_element(Glib::RefPtr<Gst::Plugin> plugin)
  45 {
  46         Gst::ElementFactory::register_element(plugin, "sigrok_legacy_capture_device",
  47                         0, Gst::register_mm_type<LegacyCaptureDevice>(
  48                                 "sigrok_legacy_capture_device"));
  49
  50         return true;
  51 }
  52
  53 LegacyCaptureDevice::LegacyCaptureDevice(GstElement *gobj) :
  54         Glib::ObjectBase(typeid(LegacyCaptureDevice)),
  55         CaptureDevice(gobj)
  56 {
  57         add_pad(src_pad_ = Gst::Pad::create(get_pad_template("src"), "src"));
  58 }
  59
  60 Glib::RefPtr<LegacyCaptureDevice>LegacyCaptureDevice::create(
  61         shared_ptr<sigrok::HardwareDevice> libsigrok_device)
  62 {
  63         auto element = Gst::ElementFactory::create_element("sigrok_legacy_capture_device");
  64         if (!element)
  65                 throw runtime_error("Failed to create element - plugin not registered?");
  66         auto device = Glib::RefPtr<LegacyCaptureDevice>::cast_static(element);
  67         device->libsigrok_device_ = libsigrok_device;
  68
  69         return device;
  70 }
  71
  72 shared_ptr<sigrok::HardwareDevice> LegacyCaptureDevice::libsigrok_device()
  73 {
  74         return libsigrok_device_;
  75 }
  76
  77 Gst::StateChangeReturn LegacyCaptureDevice::change_state_vfunc(Gst::StateChange transition)
  78 {
  79         switch (transition) {
  80         case Gst::STATE_CHANGE_READY_TO_PAUSED:
  81                 return Gst::StateChangeReturn::STATE_CHANGE_NO_PREROLL;
  82         case Gst::STATE_CHANGE_PAUSED_TO_PLAYING:
  83                 task_ = Gst::Task::create(std::bind(&LegacyCaptureDevice::run_, this));
  84                 task_->set_lock(mutex_);
  85                 src_pad_->set_active(true);
  86                 task_->start();
  87                 return Gst::STATE_CHANGE_SUCCESS;
  88         default:
  89                 return Gst::STATE_CHANGE_SUCCESS;
  90         }
  91 }
  92
  93 void LegacyCaptureDevice::datafeed_callback_(
  94         shared_ptr<sigrok::Device> device,
  95         shared_ptr<sigrok::Packet> packet)
  96 {
  97         (void)device;
  98
  99         switch (packet->type()->id()) {
 100         case SR_DF_LOGIC: {
 101                 auto logic = static_pointer_cast<sigrok::Logic>(packet->payload());
 102                 auto mem = Gst::Memory::create(
 103                                 Gst::MEMORY_FLAG_READONLY,
 104                                 logic->data_pointer(),
 105                                 logic->data_length(),
 106                                 0,
 107                                 logic->data_length());
 108                 auto buf = Gst::Buffer::create();
 109                 buf->append_memory(move(mem));
 110                 src_pad_->push(move(buf));
 111                 break;
 112         }
 113         case SR_DF_END:
 114                 session_->stop();
 115                 src_pad_->push_event(Gst::EventEos::create());
 116                 break;
 117         default:
 118                 break;
 119         }
 120 }
 121
 122 void LegacyCaptureDevice::run_()
 123 {
 124         session_ = libsigrok_device_->driver()->parent()->create_session();
 125         session_->add_device(libsigrok_device_);
 126         session_->add_datafeed_callback(bind(&LegacyCaptureDevice::datafeed_callback_, this, _1, _2));
 127         session_->start();
 128         session_->run();
 129         task_->stop();
 130 }
 131 #endif
 132
 133 }