mirror of
https://github.com/kunkundi/crossdesk.git
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Support screen capture on MacOS
This commit is contained in:
dijunkun
286
test/screen_capture/mac_capture.cpp
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286
test/screen_capture/mac_capture.cpp
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#include <stdio.h>
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#define __STDC_CONSTANT_MACROS
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#ifdef _WIN32
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// Windows
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extern "C" {
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#include "SDL/SDL.h"
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#include "libavcodec/avcodec.h"
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#include "libavdevice/avdevice.h"
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#include "libavformat/avformat.h"
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#include "libswscale/swscale.h"
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};
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#else
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// Linux...
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <SDL2/SDL.h>
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#include <libavcodec/avcodec.h>
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#include <libavdevice/avdevice.h>
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#include <libavformat/avformat.h>
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#include <libswscale/swscale.h>
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#ifdef __cplusplus
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};
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#endif
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#endif
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// Output YUV420P
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#define OUTPUT_YUV420P 0
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//'1' Use Dshow
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//'0' Use GDIgrab
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#define USE_DSHOW 0
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// Refresh Event
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#define SFM_REFRESH_EVENT (SDL_USEREVENT + 1)
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#define SFM_BREAK_EVENT (SDL_USEREVENT + 2)
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int thread_exit = 0;
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int sfp_refresh_thread(void *opaque) {
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thread_exit = 0;
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while (!thread_exit) {
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SDL_Event event;
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event.type = SFM_REFRESH_EVENT;
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SDL_PushEvent(&event);
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SDL_Delay(40);
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}
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thread_exit = 0;
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// Break
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SDL_Event event;
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event.type = SFM_BREAK_EVENT;
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SDL_PushEvent(&event);
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return 0;
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}
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// Show AVFoundation Device
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void show_avfoundation_device() {
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AVFormatContext *pFormatCtx = avformat_alloc_context();
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AVDictionary *options = NULL;
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av_dict_set(&options, "list_devices", "true", 0);
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AVInputFormat *iformat =
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(AVInputFormat *)av_find_input_format("avfoundation");
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printf("==AVFoundation Device Info===\n");
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avformat_open_input(&pFormatCtx, "", iformat, &options);
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printf("=============================\n");
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}
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int main(int argc, char *argv[]) {
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AVFormatContext *pFormatCtx;
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int i, videoindex;
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AVCodecContext *pCodecCtx;
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AVCodec *pCodec;
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avformat_network_init();
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pFormatCtx = avformat_alloc_context();
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// Open File
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// char filepath[]="src01_480x272_22.h265";
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// avformat_open_input(&pFormatCtx,filepath,NULL,NULL)
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// Register Device
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avdevice_register_all();
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// Windows
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#ifdef _WIN32
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#if USE_DSHOW
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// Use dshow
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//
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// Need to Install screen-capture-recorder
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// screen-capture-recorder
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// Website: http://sourceforge.net/projects/screencapturer/
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//
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AVInputFormat *ifmt = av_find_input_format("dshow");
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if (avformat_open_input(&pFormatCtx, "video=screen-capture-recorder", ifmt,
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NULL) != 0) {
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printf("Couldn't open input stream.\n");
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return -1;
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}
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#else
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// Use gdigrab
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AVDictionary *options = NULL;
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// Set some options
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// grabbing frame rate
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// av_dict_set(&options,"framerate","5",0);
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// The distance from the left edge of the screen or desktop
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// av_dict_set(&options,"offset_x","20",0);
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// The distance from the top edge of the screen or desktop
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// av_dict_set(&options,"offset_y","40",0);
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// Video frame size. The default is to capture the full screen
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// av_dict_set(&options,"video_size","640x480",0);
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AVInputFormat *ifmt = av_find_input_format("gdigrab");
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if (avformat_open_input(&pFormatCtx, "desktop", ifmt, &options) != 0) {
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printf("Couldn't open input stream.\n");
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return -1;
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}
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#endif
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#elif defined linux
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// Linux
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AVDictionary *options = NULL;
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// Set some options
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// grabbing frame rate
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// av_dict_set(&options,"framerate","5",0);
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// Make the grabbed area follow the mouse
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// av_dict_set(&options,"follow_mouse","centered",0);
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// Video frame size. The default is to capture the full screen
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// av_dict_set(&options,"video_size","640x480",0);
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AVInputFormat *ifmt = av_find_input_format("x11grab");
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// Grab at position 10,20
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if (avformat_open_input(&pFormatCtx, ":0.0+10,20", ifmt, &options) != 0) {
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printf("Couldn't open input stream.\n");
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return -1;
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}
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#else
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show_avfoundation_device();
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// Mac
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AVInputFormat *ifmt = (AVInputFormat *)av_find_input_format("avfoundation");
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// Avfoundation
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//[video]:[audio]
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if (avformat_open_input(&pFormatCtx, "1", ifmt, NULL) != 0) {
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printf("Couldn't open input stream.\n");
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return -1;
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}
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#endif
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if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {
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printf("Couldn't find stream information.\n");
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return -1;
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}
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videoindex = -1;
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for (i = 0; i < pFormatCtx->nb_streams; i++)
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if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
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videoindex = i;
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break;
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}
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if (videoindex == -1) {
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printf("Didn't find a video stream.\n");
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return -1;
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}
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pCodecCtx = pFormatCtx->streams[videoindex]->codec;
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pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
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if (pCodec == NULL) {
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printf("Codec not found.\n");
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return -1;
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}
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if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {
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printf("Could not open codec.\n");
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return -1;
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}
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AVFrame *pFrame, *pFrameYUV;
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pFrame = av_frame_alloc();
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pFrameYUV = av_frame_alloc();
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// unsigned char *out_buffer=(unsigned char
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// *)av_malloc(avpicture_get_size(AV_PIX_FMT_YUV420P, pCodecCtx->width,
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// pCodecCtx->height)); avpicture_fill((AVPicture *)pFrameYUV, out_buffer,
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// AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
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// SDL----------------------------
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if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {
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printf("Could not initialize SDL - %s\n", SDL_GetError());
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return -1;
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}
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int screen_w = 640, screen_h = 360;
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const SDL_VideoInfo *vi = SDL_GetVideoInfo();
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// Half of the Desktop's width and height.
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screen_w = vi->current_w / 2;
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screen_h = vi->current_h / 2;
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SDL_Surface *screen;
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screen = SDL_SetVideoMode(screen_w, screen_h, 0, 0);
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if (!screen) {
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printf("SDL: could not set video mode - exiting:%s\n", SDL_GetError());
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return -1;
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}
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SDL_Overlay *bmp;
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bmp = SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height,
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SDL_YV12_OVERLAY, screen);
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SDL_Rect rect;
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rect.x = 0;
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rect.y = 0;
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rect.w = screen_w;
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rect.h = screen_h;
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// SDL End------------------------
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int ret, got_picture;
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AVPacket *packet = (AVPacket *)av_malloc(sizeof(AVPacket));
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#if OUTPUT_YUV420P
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FILE *fp_yuv = fopen("output.yuv", "wb+");
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#endif
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struct SwsContext *img_convert_ctx;
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img_convert_ctx = sws_getContext(
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pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width,
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pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);
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//------------------------------
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SDL_Thread *video_tid = SDL_CreateThread(sfp_refresh_thread, NULL);
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//
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SDL_WM_SetCaption("Simplest FFmpeg Grab Desktop", NULL);
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// Event Loop
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SDL_Event event;
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for (;;) {
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// Wait
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SDL_WaitEvent(&event);
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if (event.type == SFM_REFRESH_EVENT) {
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//------------------------------
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if (av_read_frame(pFormatCtx, packet) >= 0) {
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if (packet->stream_index == videoindex) {
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ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
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if (ret < 0) {
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printf("Decode Error.\n");
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return -1;
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}
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if (got_picture) {
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SDL_LockYUVOverlay(bmp);
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pFrameYUV->data[0] = bmp->pixels[0];
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pFrameYUV->data[1] = bmp->pixels[2];
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pFrameYUV->data[2] = bmp->pixels[1];
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pFrameYUV->linesize[0] = bmp->pitches[0];
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pFrameYUV->linesize[1] = bmp->pitches[2];
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pFrameYUV->linesize[2] = bmp->pitches[1];
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sws_scale(img_convert_ctx,
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(const unsigned char *const *)pFrame->data,
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pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data,
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pFrameYUV->linesize);
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#if OUTPUT_YUV420P
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int y_size = pCodecCtx->width * pCodecCtx->height;
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fwrite(pFrameYUV->data[0], 1, y_size, fp_yuv); // Y
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fwrite(pFrameYUV->data[1], 1, y_size / 4, fp_yuv); // U
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fwrite(pFrameYUV->data[2], 1, y_size / 4, fp_yuv); // V
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#endif
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SDL_UnlockYUVOverlay(bmp);
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SDL_DisplayYUVOverlay(bmp, &rect);
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}
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}
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av_free_packet(packet);
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} else {
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// Exit Thread
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thread_exit = 1;
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}
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} else if (event.type == SDL_QUIT) {
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thread_exit = 1;
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} else if (event.type == SFM_BREAK_EVENT) {
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break;
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}
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}
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sws_freeContext(img_convert_ctx);
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#if OUTPUT_YUV420P
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fclose(fp_yuv);
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#endif
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SDL_Quit();
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// av_free(out_buffer);
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av_free(pFrameYUV);
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avcodec_close(pCodecCtx);
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avformat_close_input(&pFormatCtx);
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return 0;
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}
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