src/legacy_input.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 LegacyInput::class_init(Gst::ElementClass<LegacyInput> *klass)
  32 {
  33         klass->set_metadata("sigrok legacy input",
  34                         "Transform", "Wrapper for inputs using legacy libsigrok APIs",
  35                         "Martin Ling");
  36
  37         klass->add_pad_template(Gst::PadTemplate::create(
  38                         "sink",
  39                         Gst::PAD_SINK,
  40                         Gst::PAD_ALWAYS,
  41                         Gst::Caps::create_any()));
  42
  43         klass->add_pad_template(Gst::PadTemplate::create(
  44                         "src",
  45                         Gst::PAD_SRC,
  46                         Gst::PAD_ALWAYS,
  47                         Gst::Caps::create_any()));
  48 }
  49
  50 bool LegacyInput::register_element(Glib::RefPtr<Gst::Plugin> plugin)
  51 {
  52         Gst::ElementFactory::register_element(plugin, "sigrok_legacy_input",
  53                         0, Gst::register_mm_type<LegacyInput>(
  54                                 "sigrok_legacy_input"));
  55
  56         return true;
  57 }
  58
  59 LegacyInput::LegacyInput(GstElement *gobj) :
  60         Glib::ObjectBase(typeid(LegacyInput)),
  61         Gst::Element(gobj)
  62 {
  63         add_pad(sink_pad_ = Gst::Pad::create(get_pad_template("sink"), "sink"));
  64         add_pad(src_pad_ = Gst::Pad::create(get_pad_template("src"), "src"));
  65         sink_pad_->set_chain_function(sigc::mem_fun(*this, &LegacyInput::chain));
  66 }
  67
  68 Glib::RefPtr<LegacyInput> LegacyInput::create(
  69         shared_ptr<sigrok::InputFormat> libsigrok_input_format,
  70         map<string, Glib::VariantBase> options)
  71 {
  72         auto element = Gst::ElementFactory::create_element("sigrok_legacy_input");
  73         if (!element)
  74                 throw runtime_error("Failed to create element - plugin not registered?");
  75         auto input = Glib::RefPtr<LegacyInput>::cast_static(element);
  76         input->libsigrok_input_format_ = libsigrok_input_format;
  77         input->options_ = options;
  78
  79         return input;
  80 }
  81
  82 bool LegacyInput::start_vfunc()
  83 {
  84         libsigrok_input_ = libsigrok_input_format_->create_input(options_);
  85         auto context = libsigrok_input_format_->parent();
  86         session_ = context->create_session();
  87         session_->add_device(libsigrok_input_->device());
  88         session_->add_datafeed_callback(bind(&LegacyInput::datafeed_callback, this, _1, _2));
  89         session_->start();
  90
  91         return true;
  92 }
  93
  94 void LegacyInput::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 Gst::FlowReturn LegacyInput::chain(const Glib::RefPtr<Gst::Pad> &,
 124         const Glib::RefPtr<Gst::Buffer> &buf)
 125 {
 126         Gst::MapInfo info;
 127         buf->map(info, Gst::MAP_READ);
 128         libsigrok_input_->send(info.get_data(), info.get_size());
 129         buf->unmap(info);
 130
 131         return Gst::FLOW_OK;
 132 }
 133
 134 bool LegacyInput::stop_vfunc()
 135 {
 136         libsigrok_input_->end();
 137
 138         return true;
 139 }
 140 #endif
 141
 142 }