src/main.cpp

   1 /*
   2  * This file is part of the libsigrokflow project.
   3  *
   4  * Copyright (C) 2018 Uwe Hermann <uwe@hermann-uwe.de>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <libsigrokflow/libsigrokflow.hpp>
  22
  23 #include <iostream>
  24
  25 namespace Srf
  26 {
  27
  28 using namespace std;
  29 using namespace std::placeholders;
  30
  31 void init()
  32 {
  33 }
  34
  35 Glib::RefPtr<LegacyCaptureDevice>LegacyCaptureDevice::create(
  36         shared_ptr<sigrok::HardwareDevice> libsigrok_device)
  37 {
  38         auto element = Gst::ElementFactory::create_element("sigrok_legacy_capture_device");
  39         if (!element)
  40                 throw runtime_error("Failed to create element - plugin not registered?");
  41         auto device = Glib::RefPtr<LegacyCaptureDevice>::cast_static(element);
  42
  43         auto src_template = Gst::PadTemplate::create("src",
  44                         Gst::PAD_SRC,
  45                         Gst::PAD_ALWAYS,
  46                         Gst::Caps::create_any());
  47         device->_src_pad = Gst::Pad::create(src_template);
  48         device->add_pad(device->_src_pad);
  49         device->_libsigrok_device = libsigrok_device;
  50         return device;
  51 }
  52
  53 shared_ptr<sigrok::HardwareDevice> LegacyCaptureDevice::libsigrok_device()
  54 {
  55         return _libsigrok_device;
  56 }
  57
  58 Gst::StateChangeReturn LegacyCaptureDevice::change_state_vfunc(Gst::StateChange transition)
  59 {
  60         switch (transition)
  61         {
  62                 case Gst::STATE_CHANGE_READY_TO_PAUSED:
  63                         return Gst::StateChangeReturn::STATE_CHANGE_NO_PREROLL;
  64                 case Gst::STATE_CHANGE_PAUSED_TO_PLAYING:
  65                         _libsigrok_device->open();
  66                         _libsigrok_device->config_set(sigrok::ConfigKey::LIMIT_SAMPLES,
  67                                         Glib::Variant<int>::create(10));
  68                         _task = Gst::Task::create(std::bind(&LegacyCaptureDevice::_run, this));
  69                         _task->set_lock(_mutex);
  70                         _src_pad->set_active(true);
  71                         _task->start();
  72                         return Gst::STATE_CHANGE_SUCCESS;
  73                 default:
  74                         return Gst::STATE_CHANGE_SUCCESS;
  75         }
  76 }
  77
  78 void LegacyCaptureDevice::_datafeed_callback(
  79         shared_ptr<sigrok::Device> device,
  80         shared_ptr<sigrok::Packet> packet)
  81 {
  82         (void) device;
  83         switch (packet->type()->id()) {
  84                 case SR_DF_LOGIC:
  85                 {
  86                         auto logic = static_pointer_cast<sigrok::Logic>(packet->payload());
  87                         auto mem = Gst::Memory::create(
  88                                         Gst::MEMORY_FLAG_READONLY,
  89                                         logic->data_pointer(),
  90                                         logic->data_length(),
  91                                         0,
  92                                         logic->data_length());
  93                         auto buf = Gst::Buffer::create();
  94                         buf->append_memory(move(mem));
  95                         _src_pad->push(move(buf));
  96                         break;
  97                 }
  98                 case SR_DF_END:
  99                         _session->stop();
 100                         _src_pad->push_event(Gst::EventEos::create());
 101                         break;
 102                 default:
 103                         break;
 104         }
 105 }
 106
 107 void LegacyCaptureDevice::_run()
 108 {
 109         _session = _libsigrok_device->driver()->parent()->create_session();
 110         _session->add_device(_libsigrok_device);
 111         _session->add_datafeed_callback(bind(&LegacyCaptureDevice::_datafeed_callback, this, _1, _2));
 112         _session->start();
 113         _session->run();
 114         _task->stop();
 115 }
 116
 117 }