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/* $Id: videodev.c 4016 2012-04-04 05:05:50Z bennylp $ */
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* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include <pjmedia-videodev/videodev_imp.h>
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#include <pj/assert.h>
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#include <pj/string.h>
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#if defined(PJMEDIA_HAS_VIDEO) && (PJMEDIA_HAS_VIDEO != 0)
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#define THIS_FILE "videodev.c"
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#define DEFINE_CAP(name, info) {name, info}
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/* Capability names */
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static struct cap_info
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DEFINE_CAP("format", "Video format"),
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DEFINE_CAP("scale", "Input dimension"),
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DEFINE_CAP("window", "Window handle"),
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DEFINE_CAP("resize", "Renderer resize"),
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DEFINE_CAP("position", "Renderer position"),
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DEFINE_CAP("hide", "Renderer hide"),
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DEFINE_CAP("preview", "Input preview"),
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DEFINE_CAP("orientation", "Video orientation"),
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DEFINE_CAP("switch", "Switch device"),
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DEFINE_CAP("wndflags", "Window flags")
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* The device index seen by application and driver is different.
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* At application level, device index is index to global list of device.
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* At driver level, device index is index to device list on that particular
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#define MAKE_DEV_ID(f_id, index) (((f_id & 0xFFFF) << 16) | (index & 0xFFFF))
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#define GET_INDEX(dev_id) ((dev_id) & 0xFFFF)
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#define GET_FID(dev_id) ((dev_id) >> 16)
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#define DEFAULT_DEV_ID 0
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/* extern functions to create factories */
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#if PJMEDIA_VIDEO_DEV_HAS_NULL_VIDEO
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pjmedia_vid_dev_factory* pjmedia_null_video_factory(pj_pool_factory *pf);
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#if PJMEDIA_VIDEO_DEV_HAS_DSHOW
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pjmedia_vid_dev_factory* pjmedia_dshow_factory(pj_pool_factory *pf);
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#if PJMEDIA_VIDEO_DEV_HAS_CBAR_SRC
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pjmedia_vid_dev_factory* pjmedia_cbar_factory(pj_pool_factory *pf);
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#if PJMEDIA_VIDEO_DEV_HAS_SDL
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pjmedia_vid_dev_factory* pjmedia_sdl_factory(pj_pool_factory *pf);
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#if PJMEDIA_VIDEO_DEV_HAS_FFMPEG
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pjmedia_vid_dev_factory* pjmedia_ffmpeg_factory(pj_pool_factory *pf);
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#if PJMEDIA_VIDEO_DEV_HAS_V4L2
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pjmedia_vid_dev_factory* pjmedia_v4l2_factory(pj_pool_factory *pf);
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#if PJMEDIA_VIDEO_DEV_HAS_QT
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pjmedia_vid_dev_factory* pjmedia_qt_factory(pj_pool_factory *pf);
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#if PJMEDIA_VIDEO_DEV_HAS_IOS
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pjmedia_vid_dev_factory* pjmedia_ios_factory(pj_pool_factory *pf);
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#define MAX_DRIVERS 16
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/* driver structure */
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/* Creation function */
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pjmedia_vid_dev_factory_create_func_ptr create;
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/* Factory instance */
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pjmedia_vid_dev_factory *f;
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char name[32]; /* Driver name */
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unsigned dev_cnt; /* Number of devices */
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unsigned start_idx; /* Start index in global list */
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int cap_dev_idx; /* Default capture device. */
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int rend_dev_idx; /* Default render device */
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/* The video device subsystem */
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static struct vid_subsys
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unsigned init_count; /* How many times init() is called */
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pj_pool_factory *pf; /* The pool factory. */
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unsigned drv_cnt; /* Number of drivers. */
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struct driver drv[MAX_DRIVERS]; /* Array of drivers. */
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unsigned dev_cnt; /* Total number of devices. */
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pj_uint32_t dev_list[MAX_DEVS];/* Array of device IDs. */
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/* API: get capability name/info */
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PJ_DEF(const char*) pjmedia_vid_dev_cap_name(pjmedia_vid_dev_cap cap,
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if (p_desc==NULL) p_desc = &desc;
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for (i=0; i<PJ_ARRAY_SIZE(cap_infos); ++i) {
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if (i==PJ_ARRAY_SIZE(cap_infos)) {
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*p_desc = cap_infos[i].info;
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return cap_infos[i].name;
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static pj_status_t get_cap_pointer(const pjmedia_vid_dev_param *param,
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pjmedia_vid_dev_cap cap,
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#define FIELD_INFO(name) *ptr = (void*)¶m->name; \
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*size = sizeof(param->name)
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case PJMEDIA_VID_DEV_CAP_FORMAT:
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case PJMEDIA_VID_DEV_CAP_INPUT_SCALE:
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FIELD_INFO(disp_size);
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case PJMEDIA_VID_DEV_CAP_OUTPUT_WINDOW:
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case PJMEDIA_VID_DEV_CAP_OUTPUT_RESIZE:
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FIELD_INFO(disp_size);
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case PJMEDIA_VID_DEV_CAP_OUTPUT_POSITION:
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FIELD_INFO(window_pos);
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case PJMEDIA_VID_DEV_CAP_OUTPUT_HIDE:
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FIELD_INFO(window_hide);
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case PJMEDIA_VID_DEV_CAP_INPUT_PREVIEW:
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FIELD_INFO(native_preview);
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case PJMEDIA_VID_DEV_CAP_ORIENTATION:
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/* The PJMEDIA_VID_DEV_CAP_SWITCH does not have an entry in the
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* param (it doesn't make sense to open a stream and tell it
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* to switch immediately).
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case PJMEDIA_VID_DEV_CAP_OUTPUT_WINDOW_FLAGS:
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FIELD_INFO(window_flags);
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return PJMEDIA_EVID_INVCAP;
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/* API: set cap value to param */
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pjmedia_vid_dev_param_set_cap( pjmedia_vid_dev_param *param,
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pjmedia_vid_dev_cap cap,
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status = get_cap_pointer(param, cap, &cap_ptr, &cap_size);
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if (status != PJ_SUCCESS)
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pj_memcpy(cap_ptr, pval, cap_size);
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/* API: get cap value from param */
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pjmedia_vid_dev_param_get_cap( const pjmedia_vid_dev_param *param,
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pjmedia_vid_dev_cap cap,
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status = get_cap_pointer(param, cap, &cap_ptr, &cap_size);
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if (status != PJ_SUCCESS)
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if ((param->flags & cap) == 0) {
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pj_bzero(cap_ptr, cap_size);
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return PJMEDIA_EVID_INVCAP;
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pj_memcpy(pval, cap_ptr, cap_size);
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/* Internal: init driver */
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static pj_status_t init_driver(unsigned drv_idx, pj_bool_t refresh)
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struct driver *drv = &vid_subsys.drv[drv_idx];
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pjmedia_vid_dev_factory *f;
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/* Create the factory */
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f = (*drv->create)(vid_subsys.pf);
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/* Call factory->init() */
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status = f->op->init(f);
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if (status != PJ_SUCCESS) {
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/* Get number of devices */
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dev_cnt = f->op->get_dev_count(f);
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if (dev_cnt + vid_subsys.dev_cnt > MAX_DEVS) {
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PJ_LOG(4,(THIS_FILE, "%d device(s) cannot be registered because"
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" there are too many devices",
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vid_subsys.dev_cnt + dev_cnt - MAX_DEVS));
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dev_cnt = MAX_DEVS - vid_subsys.dev_cnt;
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/* enabling this will cause pjsua-lib initialization to fail when there
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* is no video device installed in the system, even when pjsua has been
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* run with --null-video
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return PJMEDIA_EVID_NODEV;
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/* Fill in default devices */
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drv->rend_dev_idx = drv->cap_dev_idx = -1;
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for (i=0; i<dev_cnt; ++i) {
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pjmedia_vid_dev_info info;
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status = f->op->get_dev_info(f, i, &info);
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if (status != PJ_SUCCESS) {
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if (drv->name[0]=='\0') {
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/* Set driver name */
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pj_ansi_strncpy(drv->name, info.driver, sizeof(drv->name));
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drv->name[sizeof(drv->name)-1] = '\0';
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if (drv->rend_dev_idx < 0 && (info.dir & PJMEDIA_DIR_RENDER)) {
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/* Set default render device */
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drv->rend_dev_idx = i;
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if (drv->cap_dev_idx < 0 && (info.dir & PJMEDIA_DIR_CAPTURE)) {
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/* Set default capture device */
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drv->cap_dev_idx = i;
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if (drv->rend_dev_idx >= 0 && drv->cap_dev_idx >= 0) {
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/* Register the factory */
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drv->f->sys.drv_idx = drv_idx;
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drv->start_idx = vid_subsys.dev_cnt;
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drv->dev_cnt = dev_cnt;
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/* Register devices to global list */
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for (i=0; i<dev_cnt; ++i) {
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vid_subsys.dev_list[vid_subsys.dev_cnt++] = MAKE_DEV_ID(drv_idx, i);
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/* Internal: deinit driver */
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static void deinit_driver(unsigned drv_idx)
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struct driver *drv = &vid_subsys.drv[drv_idx];
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drv->f->op->destroy(drv->f);
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drv->rend_dev_idx = drv->cap_dev_idx = -1;
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/* API: Initialize the video device subsystem. */
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PJ_DEF(pj_status_t) pjmedia_vid_dev_subsys_init(pj_pool_factory *pf)
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pj_status_t status = PJ_SUCCESS;
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/* Allow init() to be called multiple times as long as there is matching
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* number of shutdown().
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if (vid_subsys.init_count++ != 0) {
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/* Register error subsystem */
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pj_register_strerror(PJMEDIA_VIDEODEV_ERRNO_START,
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&pjmedia_videodev_strerror);
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vid_subsys.drv_cnt = 0;
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vid_subsys.dev_cnt = 0;
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/* Register creation functions */
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#if PJMEDIA_VIDEO_DEV_HAS_V4L2
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vid_subsys.drv[vid_subsys.drv_cnt++].create = &pjmedia_v4l2_factory;
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#if PJMEDIA_VIDEO_DEV_HAS_QT
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vid_subsys.drv[vid_subsys.drv_cnt++].create = &pjmedia_qt_factory;
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#if PJMEDIA_VIDEO_DEV_HAS_IOS
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vid_subsys.drv[vid_subsys.drv_cnt++].create = &pjmedia_ios_factory;
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#if PJMEDIA_VIDEO_DEV_HAS_DSHOW
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vid_subsys.drv[vid_subsys.drv_cnt++].create = &pjmedia_dshow_factory;
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#if PJMEDIA_VIDEO_DEV_HAS_FFMPEG
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vid_subsys.drv[vid_subsys.drv_cnt++].create = &pjmedia_ffmpeg_factory;
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#if PJMEDIA_VIDEO_DEV_HAS_CBAR_SRC
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vid_subsys.drv[vid_subsys.drv_cnt++].create = &pjmedia_cbar_factory;
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#if PJMEDIA_VIDEO_DEV_HAS_SDL
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vid_subsys.drv[vid_subsys.drv_cnt++].create = &pjmedia_sdl_factory;
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/* Initialize each factory and build the device ID list */
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for (i=0; i<vid_subsys.drv_cnt; ++i) {
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status = init_driver(i, PJ_FALSE);
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if (status != PJ_SUCCESS) {
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return vid_subsys.dev_cnt ? PJ_SUCCESS : status;
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/* API: register a video device factory to the video device subsystem. */
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pjmedia_vid_register_factory(pjmedia_vid_dev_factory_create_func_ptr adf,
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pjmedia_vid_dev_factory *factory)
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pj_bool_t refresh = PJ_FALSE;
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if (vid_subsys.init_count == 0)
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return PJMEDIA_EVID_INIT;
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vid_subsys.drv[vid_subsys.drv_cnt].create = adf;
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vid_subsys.drv[vid_subsys.drv_cnt].f = factory;
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/* Call factory->init() */
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status = factory->op->init(factory);
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if (status != PJ_SUCCESS) {
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factory->op->destroy(factory);
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status = init_driver(vid_subsys.drv_cnt, refresh);
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if (status == PJ_SUCCESS) {
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vid_subsys.drv_cnt++;
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deinit_driver(vid_subsys.drv_cnt);
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/* API: unregister a video device factory from the video device subsystem. */
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pjmedia_vid_unregister_factory(pjmedia_vid_dev_factory_create_func_ptr adf,
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pjmedia_vid_dev_factory *factory)
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if (vid_subsys.init_count == 0)
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return PJMEDIA_EVID_INIT;
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for (i=0; i<vid_subsys.drv_cnt; ++i) {
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struct driver *drv = &vid_subsys.drv[i];
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if ((factory && drv->f==factory) || (adf && drv->create == adf)) {
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for (j = drv->start_idx; j < drv->start_idx + drv->dev_cnt; j++)
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vid_subsys.dev_list[j] = (pj_uint32_t)PJMEDIA_VID_INVALID_DEV;
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pj_bzero(drv, sizeof(*drv));
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return PJMEDIA_EVID_ERR;
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/* API: get the pool factory registered to the video device subsystem. */
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PJ_DEF(pj_pool_factory*) pjmedia_vid_dev_subsys_get_pool_factory(void)
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return vid_subsys.pf;
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/* API: Shutdown the video device subsystem. */
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PJ_DEF(pj_status_t) pjmedia_vid_dev_subsys_shutdown(void)
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/* Allow shutdown() to be called multiple times as long as there is
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* matching number of init().
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if (vid_subsys.init_count == 0) {
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--vid_subsys.init_count;
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if (vid_subsys.init_count == 0) {
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for (i=0; i<vid_subsys.drv_cnt; ++i) {
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vid_subsys.pf = NULL;
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/* API: Refresh the list of video devices installed in the system. */
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PJ_DEF(pj_status_t) pjmedia_vid_dev_refresh(void)
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vid_subsys.dev_cnt = 0;
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for (i=0; i<vid_subsys.drv_cnt; ++i) {
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struct driver *drv = &vid_subsys.drv[i];
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if (drv->f && drv->f->op->refresh) {
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pj_status_t status = drv->f->op->refresh(drv->f);
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if (status != PJ_SUCCESS) {
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PJ_PERROR(4, (THIS_FILE, status, "Unable to refresh device "
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"list for %s", drv->name));
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init_driver(i, PJ_TRUE);
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/* API: Get the number of video devices installed in the system. */
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PJ_DEF(unsigned) pjmedia_vid_dev_count(void)
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return vid_subsys.dev_cnt;
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/* Internal: convert local index to global device index */
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static pj_status_t make_global_index(unsigned drv_idx,
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pjmedia_vid_dev_index *id)
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/* Check that factory still exists */
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PJ_ASSERT_RETURN(vid_subsys.drv[drv_idx].f, PJ_EBUG);
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/* Check that device index is valid */
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PJ_ASSERT_RETURN(*id>=0 && *id<(int)vid_subsys.drv[drv_idx].dev_cnt,
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*id += vid_subsys.drv[drv_idx].start_idx;
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/* Internal: lookup device id */
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static pj_status_t lookup_dev(pjmedia_vid_dev_index id,
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pjmedia_vid_dev_factory **p_f,
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unsigned *p_local_index)
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if (id <= PJMEDIA_VID_INVALID_DEV)
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return PJMEDIA_EVID_INVDEV;
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for (i=0; i<vid_subsys.drv_cnt; ++i) {
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struct driver *drv = &vid_subsys.drv[i];
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if (id==PJMEDIA_VID_DEFAULT_CAPTURE_DEV &&
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drv->cap_dev_idx >= 0)
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id = drv->cap_dev_idx;
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make_global_index(i, &id);
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} else if (id==PJMEDIA_VID_DEFAULT_RENDER_DEV &&
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drv->rend_dev_idx >= 0)
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id = drv->rend_dev_idx;
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make_global_index(i, &id);
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return PJMEDIA_EVID_NODEFDEV;
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f_id = GET_FID(vid_subsys.dev_list[id]);
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index = GET_INDEX(vid_subsys.dev_list[id]);
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if (f_id < 0 || f_id >= (int)vid_subsys.drv_cnt)
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return PJMEDIA_EVID_INVDEV;
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if (index < 0 || index >= (int)vid_subsys.drv[f_id].dev_cnt)
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return PJMEDIA_EVID_INVDEV;
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*p_f = vid_subsys.drv[f_id].f;
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*p_local_index = (unsigned)index;
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/* API: lookup device id */
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pjmedia_vid_dev_get_local_index(pjmedia_vid_dev_index id,
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pjmedia_vid_dev_factory **p_f,
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unsigned *p_local_index)
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return lookup_dev(id, p_f, p_local_index);
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/* API: from factory and local index, get global index */
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pjmedia_vid_dev_get_global_index(const pjmedia_vid_dev_factory *f,
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pjmedia_vid_dev_index *pid)
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PJ_ASSERT_RETURN(f->sys.drv_idx >= 0 && f->sys.drv_idx < MAX_DRIVERS,
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return make_global_index(f->sys.drv_idx, pid);
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/* API: Get device information. */
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PJ_DEF(pj_status_t) pjmedia_vid_dev_get_info(pjmedia_vid_dev_index id,
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pjmedia_vid_dev_info *info)
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pjmedia_vid_dev_factory *f;
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PJ_ASSERT_RETURN(info, PJ_EINVAL);
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PJ_ASSERT_RETURN(vid_subsys.pf, PJMEDIA_EVID_INIT);
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if (id <= PJMEDIA_VID_INVALID_DEV)
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return PJMEDIA_EVID_INVDEV;
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status = lookup_dev(id, &f, &index);
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if (status != PJ_SUCCESS)
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status = f->op->get_dev_info(f, index, info);
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/* Make sure device ID is the real ID (not PJMEDIA_VID_DEFAULT_*_DEV) */
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make_global_index(f->sys.drv_idx, &info->id);
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/* API: find device */
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PJ_DEF(pj_status_t) pjmedia_vid_dev_lookup( const char *drv_name,
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const char *dev_name,
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pjmedia_vid_dev_index *id)
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pjmedia_vid_dev_factory *f = NULL;
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unsigned drv_idx, dev_idx;
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PJ_ASSERT_RETURN(drv_name && dev_name && id, PJ_EINVAL);
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PJ_ASSERT_RETURN(vid_subsys.pf, PJMEDIA_EVID_INIT);
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for (drv_idx=0; drv_idx<vid_subsys.drv_cnt; ++drv_idx) {
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if (!pj_ansi_stricmp(drv_name, vid_subsys.drv[drv_idx].name))
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f = vid_subsys.drv[drv_idx].f;
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for (dev_idx=0; dev_idx<vid_subsys.drv[drv_idx].dev_cnt; ++dev_idx)
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pjmedia_vid_dev_info info;
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status = f->op->get_dev_info(f, dev_idx, &info);
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if (status != PJ_SUCCESS)
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if (!pj_ansi_stricmp(dev_name, info.name))
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if (dev_idx==vid_subsys.drv[drv_idx].dev_cnt)
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make_global_index(drv_idx, id);
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/* API: Initialize the video device parameters with default values for the
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PJ_DEF(pj_status_t) pjmedia_vid_dev_default_param(pj_pool_t *pool,
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pjmedia_vid_dev_index id,
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pjmedia_vid_dev_param *param)
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pjmedia_vid_dev_factory *f;
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PJ_ASSERT_RETURN(param, PJ_EINVAL);
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PJ_ASSERT_RETURN(vid_subsys.pf, PJMEDIA_EVID_INIT);
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if (id <= PJMEDIA_VID_INVALID_DEV)
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return PJMEDIA_EVID_INVDEV;
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status = lookup_dev(id, &f, &index);
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if (status != PJ_SUCCESS)
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status = f->op->default_param(pool, f, index, param);
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if (status != PJ_SUCCESS)
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/* Normalize device IDs */
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make_global_index(f->sys.drv_idx, ¶m->cap_id);
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make_global_index(f->sys.drv_idx, ¶m->rend_id);
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/* API: Open video stream object using the specified parameters. */
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PJ_DEF(pj_status_t) pjmedia_vid_dev_stream_create(
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pjmedia_vid_dev_param *prm,
723
const pjmedia_vid_dev_cb *cb,
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pjmedia_vid_dev_stream **p_vid_strm)
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pjmedia_vid_dev_factory *cap_f=NULL, *rend_f=NULL, *f=NULL;
730
PJ_ASSERT_RETURN(prm && prm->dir && p_vid_strm, PJ_EINVAL);
731
PJ_ASSERT_RETURN(vid_subsys.pf, PJMEDIA_EVID_INIT);
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PJ_ASSERT_RETURN(prm->dir==PJMEDIA_DIR_CAPTURE ||
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prm->dir==PJMEDIA_DIR_RENDER ||
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prm->dir==PJMEDIA_DIR_CAPTURE_RENDER,
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/* Normalize cap_id */
738
if (prm->dir & PJMEDIA_DIR_CAPTURE) {
742
prm->cap_id = PJMEDIA_VID_DEFAULT_CAPTURE_DEV;
744
status = lookup_dev(prm->cap_id, &cap_f, &index);
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if (status != PJ_SUCCESS)
752
/* Normalize rend_id */
753
if (prm->dir & PJMEDIA_DIR_RENDER) {
756
if (prm->rend_id < 0)
757
prm->rend_id = PJMEDIA_VID_DEFAULT_RENDER_DEV;
759
status = lookup_dev(prm->rend_id, &rend_f, &index);
760
if (status != PJ_SUCCESS)
763
prm->rend_id = index;
767
PJ_ASSERT_RETURN(f != NULL, PJ_EBUG);
769
/* For now, cap_id and rend_id must belong to the same factory */
770
PJ_ASSERT_RETURN((prm->dir != PJMEDIA_DIR_CAPTURE_RENDER) ||
772
PJMEDIA_EVID_INVDEV);
774
/* Create the stream */
775
status = f->op->create_stream(f, prm, cb,
776
user_data, p_vid_strm);
777
if (status != PJ_SUCCESS)
780
/* Assign factory id to the stream */
781
(*p_vid_strm)->sys.drv_idx = f->sys.drv_idx;
785
/* API: Get the running parameters for the specified video stream. */
786
PJ_DEF(pj_status_t) pjmedia_vid_dev_stream_get_param(
787
pjmedia_vid_dev_stream *strm,
788
pjmedia_vid_dev_param *param)
792
PJ_ASSERT_RETURN(strm && param, PJ_EINVAL);
793
PJ_ASSERT_RETURN(vid_subsys.pf, PJMEDIA_EVID_INIT);
795
status = strm->op->get_param(strm, param);
796
if (status != PJ_SUCCESS)
799
/* Normalize device id's */
800
make_global_index(strm->sys.drv_idx, ¶m->cap_id);
801
make_global_index(strm->sys.drv_idx, ¶m->rend_id);
806
/* API: Get the value of a specific capability of the video stream. */
807
PJ_DEF(pj_status_t) pjmedia_vid_dev_stream_get_cap(
808
pjmedia_vid_dev_stream *strm,
809
pjmedia_vid_dev_cap cap,
812
return strm->op->get_cap(strm, cap, value);
815
/* API: Set the value of a specific capability of the video stream. */
816
PJ_DEF(pj_status_t) pjmedia_vid_dev_stream_set_cap(
817
pjmedia_vid_dev_stream *strm,
818
pjmedia_vid_dev_cap cap,
821
return strm->op->set_cap(strm, cap, value);
824
/* API: Start the stream. */
825
PJ_DEF(pj_status_t) pjmedia_vid_dev_stream_start(pjmedia_vid_dev_stream *strm)
829
if (pjmedia_vid_dev_stream_is_running(strm))
832
status = strm->op->start(strm);
833
if (status == PJ_SUCCESS)
834
strm->sys.is_running = PJ_TRUE;
838
/* API: has it been started? */
840
pjmedia_vid_dev_stream_is_running(pjmedia_vid_dev_stream *strm)
842
return strm->sys.is_running;
845
PJ_DEF(pj_status_t) pjmedia_vid_dev_stream_get_frame(
846
pjmedia_vid_dev_stream *strm,
847
pjmedia_frame *frame)
849
pj_assert(strm->op->get_frame);
850
return strm->op->get_frame(strm, frame);
853
PJ_DEF(pj_status_t) pjmedia_vid_dev_stream_put_frame(
854
pjmedia_vid_dev_stream *strm,
855
const pjmedia_frame *frame)
857
pj_assert(strm->op->put_frame);
858
return strm->op->put_frame(strm, frame);
861
/* API: Stop the stream. */
862
PJ_DEF(pj_status_t) pjmedia_vid_dev_stream_stop(pjmedia_vid_dev_stream *strm)
864
strm->sys.is_running = PJ_FALSE;
865
return strm->op->stop(strm);
868
/* API: Destroy the stream. */
869
PJ_DEF(pj_status_t) pjmedia_vid_dev_stream_destroy(
870
pjmedia_vid_dev_stream *strm)
872
strm->sys.is_running = PJ_FALSE;
873
return strm->op->destroy(strm);
877
#endif /* PJMEDIA_HAS_VIDEO */