loopback.cpp

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#ifdef HAVE_CONFIG_H
#include "config.h"
#include "config_unix.h"
#include "config_win32.h"
#endif // HAVE_CONFIG_H
 
#include "video_rxtx/loopback.hpp"
 
#include <chrono>
 
#include "debug.h"
#include "host.h"
#include "lib_common.h"
#include "utils/thread.h"
#include "video_display.h"
#include "video_frame.h"
 
using std::chrono::milliseconds;
using std::condition_variable;
using std::mutex;
using std::unique_lock;
 
static const int BUFF_MAX_LEN = 2;
static const char *MODULE_NAME = "[loopback] ";
 
loopback_video_rxtx::loopback_video_rxtx(std::map<std::string, param_u> const &params)
        : video_rxtx(params)
{
        m_display_device = static_cast<struct display *>(params.at("display_device").ptr);
}
 
loopback_video_rxtx::~loopback_video_rxtx()
{
}
 
void *loopback_video_rxtx::receiver_thread(void *arg)
{
        auto s = static_cast<loopback_video_rxtx *>(arg);
        return s->receiver_loop();
}
 
void
loopback_video_rxtx::send_frame(std::shared_ptr<video_frame> f) noexcept
{
        unique_lock<mutex> lk(m_lock);
        if (m_frames.size() >= BUFF_MAX_LEN) {
                LOG(LOG_LEVEL_WARNING) << MODULE_NAME << "Max buffer len " <<
                        BUFF_MAX_LEN << " exceeded.\n";
        }
        m_frames.push(f);
        lk.unlock();
        m_frame_ready.notify_one();
}
 
void *loopback_video_rxtx::receiver_loop()
{
        set_thread_name(__func__);
        while (!m_should_exit) {
                unique_lock<mutex> lk(m_lock);
                m_frame_ready.wait_for(lk, milliseconds(100), [this]{return m_frames.size() > 0;});
                if (m_frames.size() == 0) {
                        continue;
                }
 
                auto frame = m_frames.front();
                m_frames.pop();
                lk.unlock();
                auto new_desc = video_desc_from_frame(frame.get());
                if (m_configure_desc != new_desc) {
                        if (display_reconfigure(m_display_device, new_desc, VIDEO_NORMAL) == FALSE) {
                                LOG(LOG_LEVEL_ERROR) << "Unable to reconfigure display!\n";
                                continue;
                        }
                        m_configure_desc = new_desc;
                }
                auto display_f = display_get_frame(m_display_device);
                memcpy(display_f->tiles[0].data, frame->tiles[0].data, frame->tiles[0].data_len);
                display_put_frame(m_display_device, display_f, PUTF_BLOCKING);
        }
        display_put_frame(m_display_device, nullptr, PUTF_BLOCKING);
        return nullptr;
}
 
void *(*loopback_video_rxtx::get_receiver_thread() noexcept)(void *arg)
{
        return receiver_thread;
}
 
static video_rxtx *create_video_rxtx_loopback(std::map<std::string, param_u> const &params)
{
        return new loopback_video_rxtx(params);
}
 
static const struct video_rxtx_info loopback_video_rxtx_info = {
        "loopback dummy transport",
        create_video_rxtx_loopback
};
 
REGISTER_MODULE(loopback, &loopback_video_rxtx_info, LIBRARY_CLASS_VIDEO_RXTX, VIDEO_RXTX_ABI_VERSION);