/** * Loads the given plugin from the specified library, including its * construction and destruction functions. * * @param filepath full file path to the dynamic library containing the plugin * @param classname the full name of the class comprising the conversion plugin * @throws std::runtime_error */ void Plugin::load(const std::string& filepath, const std::string& classname) { const char *dlsym_error = dlerror(); // Reset error indicator // Attempt to open the library dll_ = std::shared_ptr<void>(dlopen(filepath.c_str(), RTLD_LAZY), dlclose); dlsym_error = dlerror(); if (!dll_ || dlsym_error) { throw std::runtime_error("Failed to open library " + filepath + " (" + std::string(dlsym_error) + ")"); } // Construct the name of the factory function (make_PluginName) std::string maker("make_" + classname); // then try to open it typedef SequenceConverter* (*maker_type)(); maker_type create_converter = (maker_type) dlsym(dll_.get(), maker.c_str()); dlsym_error = dlerror(); if (dlsym_error) { throw std::runtime_error("Failed to load plugin function " + maker + " ( " + std::string(dlsym_error) + ")"); } // Construct the name of the plugin destruction function (destroy_PluginName) std::string destroyer = "destroy_" + classname; // then try to open it typedef void (*destroyer_type)(SequenceConverter *); destroyer_type destroy_converter = (destroyer_type) dlsym(dll_.get(), destroyer.c_str()); dlsym_error = dlerror(); if (dlsym_error) { throw std::runtime_error("Failed to load plugin function " + destroyer + " (" + std::string(dlsym_error) + ")"); } // Make `new` SequenceConverter class from DLL try { converter_ = std::shared_ptr<SequenceConverter>(create_converter(), destroy_converter); } catch (const std::exception& e) { throw std::runtime_error("Failed to create converter (" + std::string(e.what()) + ")"); } }
PJ_DEF(pj_status_t) pjmedia_vid_port_create( pj_pool_t *pool, const pjmedia_vid_port_param *prm, pjmedia_vid_port **p_vid_port) { pjmedia_vid_port *vp; const pjmedia_video_format_detail *vfd; char dev_name[64]; char fmt_name[5]; pjmedia_vid_dev_cb vid_cb; pj_bool_t need_frame_buf = PJ_FALSE; pj_status_t status; unsigned ptime_usec; pjmedia_vid_dev_param vparam; pjmedia_vid_dev_info di; unsigned i; PJ_ASSERT_RETURN(pool && prm && p_vid_port, PJ_EINVAL); PJ_ASSERT_RETURN(prm->vidparam.fmt.type == PJMEDIA_TYPE_VIDEO && prm->vidparam.dir != PJMEDIA_DIR_NONE && prm->vidparam.dir != PJMEDIA_DIR_CAPTURE_RENDER, PJ_EINVAL); /* Retrieve the video format detail */ vfd = pjmedia_format_get_video_format_detail(&prm->vidparam.fmt, PJ_TRUE); if (!vfd) return PJ_EINVAL; PJ_ASSERT_RETURN(vfd->fps.num, PJ_EINVAL); /* Allocate videoport */ vp = PJ_POOL_ZALLOC_T(pool, pjmedia_vid_port); vp->pool = pj_pool_create(pool->factory, "video port", 500, 500, NULL); vp->role = prm->active ? ROLE_ACTIVE : ROLE_PASSIVE; vp->dir = prm->vidparam.dir; // vp->cap_size = vfd->size; vparam = prm->vidparam; dev_name[0] = '\0'; /* Get device info */ if (vp->dir & PJMEDIA_DIR_CAPTURE) status = pjmedia_vid_dev_get_info(prm->vidparam.cap_id, &di); else status = pjmedia_vid_dev_get_info(prm->vidparam.rend_id, &di); if (status != PJ_SUCCESS) return status; pj_ansi_snprintf(dev_name, sizeof(dev_name), "%s [%s]", di.name, di.driver); for (i = 0; i < di.fmt_cnt; ++i) { if (prm->vidparam.fmt.id == di.fmt[i].id) break; } if (i == di.fmt_cnt) { /* The device has no no matching format. Pick one from * the supported formats, and later use converter to * convert it to the required format. */ pj_assert(di.fmt_cnt != 0); vparam.fmt.id = di.fmt[0].id; } pj_strdup2_with_null(pool, &vp->dev_name, di.name); vp->stream_role = di.has_callback ? ROLE_ACTIVE : ROLE_PASSIVE; pjmedia_fourcc_name(vparam.fmt.id, fmt_name); PJ_LOG(4,(THIS_FILE, "Opening device %s for %s: format=%s, size=%dx%d @%d:%d fps", dev_name, vid_dir_name(prm->vidparam.dir), fmt_name, vfd->size.w, vfd->size.h, vfd->fps.num, vfd->fps.denum)); ptime_usec = PJMEDIA_PTIME(&vfd->fps); pjmedia_clock_src_init(&vp->clocksrc, PJMEDIA_TYPE_VIDEO, prm->vidparam.clock_rate, ptime_usec); vp->sync_clocksrc.max_sync_ticks = PJMEDIA_CLOCK_SYNC_MAX_RESYNC_DURATION * 1000 / vp->clocksrc.ptime_usec; /* Create the video stream */ pj_bzero(&vid_cb, sizeof(vid_cb)); vid_cb.capture_cb = &vidstream_cap_cb; vid_cb.render_cb = &vidstream_render_cb; status = pjmedia_vid_dev_stream_create(&vparam, &vid_cb, vp, &vp->strm); if (status != PJ_SUCCESS) goto on_error; PJ_LOG(4,(THIS_FILE, "Device %s opened: format=%s, size=%dx%d @%d:%d fps", dev_name, fmt_name, vparam.fmt.det.vid.size.w, vparam.fmt.det.vid.size.h, vparam.fmt.det.vid.fps.num, vparam.fmt.det.vid.fps.denum)); /* Subscribe to device's events */ pjmedia_event_subscribe(NULL, &vidstream_event_cb, vp, vp->strm); if (vp->dir & PJMEDIA_DIR_CAPTURE) { pjmedia_format_copy(&vp->conv.conv_param.src, &vparam.fmt); pjmedia_format_copy(&vp->conv.conv_param.dst, &prm->vidparam.fmt); } else { pjmedia_format_copy(&vp->conv.conv_param.src, &prm->vidparam.fmt); pjmedia_format_copy(&vp->conv.conv_param.dst, &vparam.fmt); } status = create_converter(vp); if (status != PJ_SUCCESS) goto on_error; if (vp->role==ROLE_ACTIVE && ((vp->dir & PJMEDIA_DIR_ENCODING) || vp->stream_role==ROLE_PASSIVE)) { pjmedia_clock_param param; /* Active role is wanted, but our device is passive, so create * master clocks to run the media flow. For encoding direction, * we also want to create our own clock since the device's clock * may run at a different rate. */ need_frame_buf = PJ_TRUE; param.usec_interval = PJMEDIA_PTIME(&vfd->fps); param.clock_rate = prm->vidparam.clock_rate; status = pjmedia_clock_create2(pool, ¶m, PJMEDIA_CLOCK_NO_HIGHEST_PRIO, (vp->dir & PJMEDIA_DIR_ENCODING) ? &enc_clock_cb: &dec_clock_cb, vp, &vp->clock); if (status != PJ_SUCCESS) goto on_error; } else if (vp->role==ROLE_PASSIVE) { vid_pasv_port *pp; /* Always need to create media port for passive role */ vp->pasv_port = pp = PJ_POOL_ZALLOC_T(pool, vid_pasv_port); pp->vp = vp; pp->base.get_frame = &vid_pasv_port_get_frame; pp->base.put_frame = &vid_pasv_port_put_frame; pjmedia_port_info_init2(&pp->base.info, &vp->dev_name, PJMEDIA_SIG_VID_PORT, prm->vidparam.dir, &prm->vidparam.fmt); need_frame_buf = PJ_TRUE; } if (need_frame_buf) { const pjmedia_video_format_info *vfi; pjmedia_video_apply_fmt_param vafp; vfi = pjmedia_get_video_format_info(NULL, vparam.fmt.id); if (!vfi) { status = PJ_ENOTFOUND; goto on_error; } pj_bzero(&vafp, sizeof(vafp)); vafp.size = vparam.fmt.det.vid.size; status = vfi->apply_fmt(vfi, &vafp); if (status != PJ_SUCCESS) goto on_error; vp->frm_buf = PJ_POOL_ZALLOC_T(pool, pjmedia_frame); vp->frm_buf_size = vafp.framebytes; vp->frm_buf->buf = pj_pool_alloc(pool, vafp.framebytes); vp->frm_buf->size = vp->frm_buf_size; vp->frm_buf->type = PJMEDIA_FRAME_TYPE_NONE; status = pj_mutex_create_simple(pool, vp->dev_name.ptr, &vp->frm_mutex); if (status != PJ_SUCCESS) goto on_error; } *p_vid_port = vp; return PJ_SUCCESS; on_error: pjmedia_vid_port_destroy(vp); return status; }