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 <gstreamermm/private/element_p.h>
  24
  25 namespace Srf
  26 {
  27
  28 using namespace std;
  29 using namespace std::placeholders;
  30
  31 #ifdef HAVE_LIBSIGROKCXX
  32 void LegacyCaptureDevice::class_init(Gst::ElementClass<LegacyCaptureDevice> *klass)
  33 {
  34         klass->set_metadata("sigrok legacy capture device",
  35                         "Source", "Wrapper for capture devices using legacy libsigrok APIs",
  36                         "Martin Ling");
  37
  38         klass->add_pad_template(Gst::PadTemplate::create(
  39                         "src",
  40                         Gst::PAD_SRC,
  41                         Gst::PAD_ALWAYS,
  42                         Gst::Caps::create_any()));
  43 }
  44
  45 bool LegacyCaptureDevice::register_element(Glib::RefPtr<Gst::Plugin> plugin)
  46 {
  47         Gst::ElementFactory::register_element(plugin, "sigrok_legacy_capture_device",
  48                         0, Gst::register_mm_type<LegacyCaptureDevice>(
  49                                 "sigrok_legacy_capture_device"));
  50
  51         return true;
  52 }
  53
  54 LegacyCaptureDevice::LegacyCaptureDevice(GstElement *gobj) :
  55         Glib::ObjectBase(typeid(LegacyCaptureDevice)),
  56         CaptureDevice(gobj)
  57 {
  58         add_pad(src_pad_ = Gst::Pad::create(get_pad_template("src"), "src"));
  59 }
  60
  61 Glib::RefPtr<LegacyCaptureDevice>LegacyCaptureDevice::create(
  62         shared_ptr<sigrok::HardwareDevice> libsigrok_device)
  63 {
  64         auto element = Gst::ElementFactory::create_element("sigrok_legacy_capture_device");
  65         if (!element)
  66                 throw runtime_error("Failed to create element - plugin not registered?");
  67         auto device = Glib::RefPtr<LegacyCaptureDevice>::cast_static(element);
  68         device->libsigrok_device_ = libsigrok_device;
  69
  70         return device;
  71 }
  72
  73 shared_ptr<sigrok::HardwareDevice> LegacyCaptureDevice::libsigrok_device()
  74 {
  75         return libsigrok_device_;
  76 }
  77
  78 Gst::StateChangeReturn LegacyCaptureDevice::change_state_vfunc(Gst::StateChange transition)
  79 {
  80         switch (transition) {
  81         case Gst::STATE_CHANGE_READY_TO_PAUSED:
  82                 return Gst::StateChangeReturn::STATE_CHANGE_NO_PREROLL;
  83         case Gst::STATE_CHANGE_PAUSED_TO_PLAYING:
  84                 task_ = Gst::Task::create(std::bind(&LegacyCaptureDevice::run, this));
  85                 task_->set_lock(mutex_);
  86                 src_pad_->set_active(true);
  87                 task_->start();
  88                 return Gst::STATE_CHANGE_SUCCESS;
  89         default:
  90                 return Gst::STATE_CHANGE_SUCCESS;
  91         }
  92 }
  93
  94 void LegacyCaptureDevice::datafeed_callback(
  95         shared_ptr<sigrok::Device> device,
  96         shared_ptr<sigrok::Packet> packet)
  97 {
  98         (void)device;
  99
 100         switch (packet->type()->id()) {
 101         case SR_DF_LOGIC: {
 102                 auto logic = static_pointer_cast<sigrok::Logic>(packet->payload());
 103                 auto mem = Gst::Memory::create(
 104                                 Gst::MEMORY_FLAG_READONLY,
 105                                 logic->data_pointer(),
 106                                 logic->data_length(),
 107                                 0,
 108                                 logic->data_length());
 109                 auto buf = Gst::Buffer::create();
 110                 buf->append_memory(move(mem));
 111                 src_pad_->push(move(buf));
 112                 break;
 113         }
 114         case SR_DF_END:
 115                 session_->stop();
 116                 src_pad_->push_event(Gst::EventEos::create());
 117                 break;
 118         default:
 119                 break;
 120         }
 121 }
 122
 123 void LegacyCaptureDevice::run()
 124 {
 125         session_ = libsigrok_device_->driver()->parent()->create_session();
 126         session_->add_device(libsigrok_device_);
 127         session_->add_datafeed_callback(bind(&LegacyCaptureDevice::datafeed_callback, this, _1, _2));
 128         session_->start();
 129         session_->run();
 130         task_->stop();
 131 }
 132 #endif
 133
 134 }