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 namespace std;
  33 using namespace std::placeholders;
  34
  35 #ifdef HAVE_LIBSIGROKCXX
  36 void LegacyCaptureDevice::class_init(Gst::ElementClass<LegacyCaptureDevice> *klass)
  37 {
  38         klass->set_metadata("sigrok legacy capture device",
  39                         "Source", "Wrapper for capture devices using legacy libsigrok APIs",
  40                         "Martin Ling");
  41
  42         klass->add_pad_template(Gst::PadTemplate::create(
  43                         "src",
  44                         Gst::PAD_SRC,
  45                         Gst::PAD_ALWAYS,
  46                         Gst::Caps::create_any()));
  47 }
  48
  49 bool LegacyCaptureDevice::register_element(Glib::RefPtr<Gst::Plugin> plugin)
  50 {
  51         Gst::ElementFactory::register_element(plugin, "sigrok_legacy_capture_device",
  52                         0, Gst::register_mm_type<LegacyCaptureDevice>(
  53                                 "sigrok_legacy_capture_device"));
  54
  55         return true;
  56 }
  57
  58 LegacyCaptureDevice::LegacyCaptureDevice(GstElement *gobj) :
  59         Glib::ObjectBase(typeid(LegacyCaptureDevice)),
  60         CaptureDevice(gobj)
  61 {
  62         add_pad(src_pad_ = Gst::Pad::create(get_pad_template("src"), "src"));
  63 }
  64
  65 Glib::RefPtr<LegacyCaptureDevice>LegacyCaptureDevice::create(
  66         shared_ptr<sigrok::HardwareDevice> libsigrok_device)
  67 {
  68         auto element = Gst::ElementFactory::create_element("sigrok_legacy_capture_device");
  69         if (!element)
  70                 throw runtime_error("Failed to create element - plugin not registered?");
  71         auto device = Glib::RefPtr<LegacyCaptureDevice>::cast_static(element);
  72         device->libsigrok_device_ = libsigrok_device;
  73
  74         return device;
  75 }
  76
  77 shared_ptr<sigrok::HardwareDevice> LegacyCaptureDevice::libsigrok_device()
  78 {
  79         return libsigrok_device_;
  80 }
  81
  82 Gst::StateChangeReturn LegacyCaptureDevice::change_state_vfunc(Gst::StateChange transition)
  83 {
  84         switch (transition) {
  85         case Gst::STATE_CHANGE_READY_TO_PAUSED:
  86                 return Gst::StateChangeReturn::STATE_CHANGE_NO_PREROLL;
  87         case Gst::STATE_CHANGE_PAUSED_TO_PLAYING:
  88                 task_ = Gst::Task::create(std::bind(&LegacyCaptureDevice::run, this));
  89                 task_->set_lock(mutex_);
  90                 src_pad_->set_active(true);
  91                 task_->start();
  92                 return Gst::STATE_CHANGE_SUCCESS;
  93         default:
  94                 return Gst::STATE_CHANGE_SUCCESS;
  95         }
  96 }
  97
  98 void LegacyCaptureDevice::datafeed_callback(
  99         shared_ptr<sigrok::Device> device,
 100         shared_ptr<sigrok::Packet> packet)
 101 {
 102         (void)device;
 103
 104         switch (packet->type()->id()) {
 105         case SR_DF_LOGIC: {
 106                 auto logic = static_pointer_cast<sigrok::Logic>(packet->payload());
 107                 auto mem = Gst::Memory::create(
 108                                 Gst::MEMORY_FLAG_READONLY,
 109                                 logic->data_pointer(),
 110                                 logic->data_length(),
 111                                 0,
 112                                 logic->data_length());
 113                 auto buf = Gst::Buffer::create();
 114                 buf->append_memory(move(mem));
 115                 src_pad_->push(move(buf));
 116                 break;
 117         }
 118         case SR_DF_END:
 119                 session_->stop();
 120                 src_pad_->push_event(Gst::EventEos::create());
 121                 break;
 122         default:
 123                 break;
 124         }
 125 }
 126
 127 void LegacyCaptureDevice::run()
 128 {
 129         session_ = libsigrok_device_->driver()->parent()->create_session();
 130         session_->add_device(libsigrok_device_);
 131         session_->add_datafeed_callback(bind(&LegacyCaptureDevice::datafeed_callback, this, _1, _2));
 132         session_->start();
 133         session_->run();
 134         task_->stop();
 135 }
 136 #endif
 137
 138 }