add vnc2mpg, a program which makes a movie from a VNC desktop using FFMPEG

1 files changed, 426 insertions, 0 deletions

diff --git a/client_examples/vnc2mpg.c b/client_examples/vnc2mpg.c
new file mode 100644
index 0000000..d1deb9b
--- /dev/null
+++ b/client_examples/vnc2mpg.c
@@ -0,0 +1,426 @@
+/*
+ * Simple movie writer for vnc; based on Libavformat API example from FFMPEG
+ * 
+ * Copyright (c) 2003 Fabrice Bellard, 2004 Johannes E. Schindelin
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.  
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <signal.h>
+#include <math.h>
+
+#ifndef M_PI
+#define M_PI 3.1415926535897931
+#endif
+
+#include "avformat.h"
+#include <rfb/rfbclient.h>
+
+/* 5 seconds stream duration */
+//#define STREAM_DURATION   5.0
+#define STREAM_FRAME_RATE 25 /* 25 images/s */
+//#define STREAM_NB_FRAMES  ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
+
+/**************************************************************/
+/* video output */
+
+AVFrame *picture, *tmp_picture;
+uint8_t *video_outbuf;
+int frame_count, video_outbuf_size;
+
+/* add a video output stream */
+AVStream *add_video_stream(AVFormatContext *oc, int codec_id, int w, int h)
+{
+    AVCodecContext *c;
+    AVStream *st;
+
+    st = av_new_stream(oc, 0);
+    if (!st) {
+        fprintf(stderr, "Could not alloc stream\n");
+        exit(1);
+    }
+    
+    c = &st->codec;
+    c->codec_id = codec_id;
+    c->codec_type = CODEC_TYPE_VIDEO;
+
+    /* put sample parameters */
+    c->bit_rate = 400000;
+    /* resolution must be a multiple of two */
+    c->width = w;  
+    c->height = h;
+    /* frames per second */
+    c->frame_rate = STREAM_FRAME_RATE;  
+    c->frame_rate_base = 1;
+    c->gop_size = 12; /* emit one intra frame every twelve frames at most */
+    if (c->codec_id == CODEC_ID_MPEG2VIDEO) {
+        /* just for testing, we also add B frames */
+        c->max_b_frames = 2;
+    }
+    if (c->codec_id == CODEC_ID_MPEG1VIDEO){
+        /* needed to avoid using macroblocks in which some coeffs overflow 
+           this doesnt happen with normal video, it just happens here as the 
+           motion of the chroma plane doesnt match the luma plane */
+        c->mb_decision=2;
+    }
+    // some formats want stream headers to be seperate
+    if(!strcmp(oc->oformat->name, "mp4") || !strcmp(oc->oformat->name, "mov") || !strcmp(oc->oformat->name, "3gp"))
+        c->flags |= CODEC_FLAG_GLOBAL_HEADER;
+    
+    return st;
+}
+
+AVFrame *alloc_picture(int pix_fmt, int width, int height)
+{
+    AVFrame *picture;
+    uint8_t *picture_buf;
+    int size;
+    
+    picture = avcodec_alloc_frame();
+    if (!picture)
+        return NULL;
+    size = avpicture_get_size(pix_fmt, width, height);
+    picture_buf = malloc(size);
+    if (!picture_buf) {
+        av_free(picture);
+        return NULL;
+    }
+    avpicture_fill((AVPicture *)picture, picture_buf, 
+                   pix_fmt, width, height);
+    return picture;
+}
+    
+void open_video(AVFormatContext *oc, AVStream *st)
+{
+    AVCodec *codec;
+    AVCodecContext *c;
+
+    c = &st->codec;
+
+    /* find the video encoder */
+    codec = avcodec_find_encoder(c->codec_id);
+    if (!codec) {
+        fprintf(stderr, "codec not found\n");
+        exit(1);
+    }
+
+    /* open the codec */
+    if (avcodec_open(c, codec) < 0) {
+        fprintf(stderr, "could not open codec\n");
+        exit(1);
+    }
+
+    video_outbuf = NULL;
+    if (!(oc->oformat->flags & AVFMT_RAWPICTURE)) {
+        /* allocate output buffer */
+        /* XXX: API change will be done */
+        video_outbuf_size = 200000;
+        video_outbuf = malloc(video_outbuf_size);
+    }
+
+    /* allocate the encoded raw picture */
+    picture = alloc_picture(c->pix_fmt, c->width, c->height);
+    if (!picture) {
+        fprintf(stderr, "Could not allocate picture\n");
+        exit(1);
+    }
+
+    /* if the output format is not RGB565, then a temporary RGB565
+       picture is needed too. It is then converted to the required
+       output format */
+    tmp_picture = NULL;
+    if (c->pix_fmt != PIX_FMT_RGB565) {
+        tmp_picture = alloc_picture(PIX_FMT_RGB565, c->width, c->height);
+        if (!tmp_picture) {
+            fprintf(stderr, "Could not allocate temporary picture\n");
+            exit(1);
+        }
+    }
+}
+
+void write_video_frame(AVFormatContext *oc, AVStream *st)
+{
+    int out_size, ret;
+    AVCodecContext *c;
+    AVFrame *picture_ptr;
+    
+    c = &st->codec;
+    
+        if (c->pix_fmt != PIX_FMT_RGB565) {
+            /* as we only generate a RGB565 picture, we must convert it
+               to the codec pixel format if needed */
+		// TODO
+            //fill_yuv_image(tmp_picture, frame_count, c->width, c->height);
+            img_convert((AVPicture *)picture, c->pix_fmt, 
+                        (AVPicture *)tmp_picture, PIX_FMT_RGB565,
+                        c->width, c->height);
+        } else {
+            // TODO: fill_yuv_image(picture, frame_count, c->width, c->height);
+        }
+        picture_ptr = picture;
+
+    
+    if (oc->oformat->flags & AVFMT_RAWPICTURE) {
+        /* raw video case. The API will change slightly in the near
+           futur for that */
+        AVPacket pkt;
+        av_init_packet(&pkt);
+        
+        pkt.flags |= PKT_FLAG_KEY;
+        pkt.stream_index= st->index;
+        pkt.data= (uint8_t *)picture_ptr;
+        pkt.size= sizeof(AVPicture);
+        
+        ret = av_write_frame(oc, &pkt);
+    } else {
+        /* encode the image */
+        out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, picture_ptr);
+        /* if zero size, it means the image was buffered */
+        if (out_size != 0) {
+            AVPacket pkt;
+            av_init_packet(&pkt);
+            
+            pkt.pts= c->coded_frame->pts;
+            if(c->coded_frame->key_frame)
+                pkt.flags |= PKT_FLAG_KEY;
+            pkt.stream_index= st->index;
+            pkt.data= video_outbuf;
+            pkt.size= out_size;
+            
+            /* write the compressed frame in the media file */
+            ret = av_write_frame(oc, &pkt);
+        } else {
+            ret = 0;
+        }
+    }
+    if (ret != 0) {
+        fprintf(stderr, "Error while writing video frame\n");
+        exit(1);
+    }
+    frame_count++;
+}
+
+void close_video(AVFormatContext *oc, AVStream *st)
+{
+    avcodec_close(&st->codec);
+    av_free(picture->data[0]);
+    av_free(picture);
+    if (tmp_picture) {
+        av_free(tmp_picture->data[0]);
+        av_free(tmp_picture);
+    }
+    av_free(video_outbuf);
+}
+
+static const char *filename;
+static AVOutputFormat *fmt;
+static AVFormatContext *oc;
+static AVStream *video_st;
+static double video_pts;
+
+static int movie_open(int w, int h) {
+    if (fmt->video_codec != CODEC_ID_NONE) {
+        video_st = add_video_stream(oc, fmt->video_codec, w, h);
+    } else
+	    return 1;
+
+    /* set the output parameters (must be done even if no
+       parameters). */
+    if (av_set_parameters(oc, NULL) < 0) {
+        fprintf(stderr, "Invalid output format parameters\n");
+        return 2;
+    }
+
+    dump_format(oc, 0, filename, 1);
+
+    /* now that all the parameters are set, we can open the audio and
+       video codecs and allocate the necessary encode buffers */
+    if (video_st)
+        open_video(oc, video_st);
+
+    /* open the output file, if needed */
+    if (!(fmt->flags & AVFMT_NOFILE)) {
+        if (url_fopen(&oc->pb, filename, URL_WRONLY) < 0) {
+            fprintf(stderr, "Could not open '%s'\n", filename);
+            return 3;
+        }
+    }
+    
+    /* write the stream header, if any */
+    av_write_header(oc);
+
+    return 0;
+}
+
+static int movie_close() {
+    int i;
+
+     /* close each codec */
+    close_video(oc, video_st);
+
+    /* write the trailer, if any */
+    av_write_trailer(oc);
+    
+    /* free the streams */
+    for(i = 0; i < oc->nb_streams; i++) {
+        av_freep(&oc->streams[i]);
+    }
+
+    if (!(fmt->flags & AVFMT_NOFILE)) {
+        /* close the output file */
+        url_fclose(&oc->pb);
+    }
+
+    /* free the stream */
+    av_free(oc);
+
+}
+
+static rfbBool quit=FALSE;
+static void signal_handler(int signal) {
+	fprintf(stderr,"Cleaning up.\n");
+	quit=TRUE;
+}
+
+/**************************************************************/
+/* VNC callback functions */
+static rfbBool resize(rfbClient* client) {
+	static rfbBool first=TRUE;
+	if(!first) {
+		movie_close();
+		perror("I don't know yet how to change resolutions!\n");
+	}
+	movie_open(client->width, client->height);
+	signal(SIGINT,signal_handler);
+	if(tmp_picture)
+		client->frameBuffer=tmp_picture->data[0];
+	else
+		client->frameBuffer=picture->data[0];
+	return TRUE;
+}
+
+static void update(rfbClient* client,int x,int y,int w,int h) {
+}
+
+/**************************************************************/
+/* media file output */
+
+int main(int argc, char **argv)
+{
+    time_t stop=0;
+    rfbClient* client;
+    int i;
+
+    /* get a vnc client structure (don't connect yet). */
+    client = rfbGetClient(5,3,2);
+    client->format.redShift=11; client->format.redMax=31;
+    client->format.greenShift=5; client->format.greenMax=63;
+    client->format.blueShift=0; client->format.blueMax=31;
+
+    /* initialize libavcodec, and register all codecs and formats */
+    av_register_all();
+   
+    if(!strncmp(argv[argc-1],":",1) ||
+	!strncmp(argv[argc-1],"127.0.0.1",9) ||
+	!strncmp(argv[argc-1],"localhost",9))
+	    client->appData.encodingsString="raw";
+
+    i=1;
+    filename=0;
+    while(i<argc) {
+	    if(argc>i+1 && !strcmp("-o",argv[i])) {
+		    filename=argv[2];
+		    i+=2;
+	    } else if(argc>i+1 && !strcmp("-t",argv[i])) {
+		    stop=time(0)+atoi(argv[i+1]);
+		    i+=2;
+	    } else if(argc>i+1 && !strcmp("-encodings",argv[i])) {
+		    client->appData.encodingsString=argv[i+1];
+		    i+=2;
+	    } else
+		    break;
+    }
+
+    if (argc != i+1) {
+        printf("usage: %s [-o output_file] [-t seconds] server:port\n"
+	       "Shoot a movie from a VNC server.\n", argv[0]);
+        exit(1);
+    }
+   
+    /* auto detect the output format from the name. default is
+       mpeg. */
+    fmt = filename?guess_format(NULL, filename, NULL):0;
+    if (!fmt) {
+        printf("Could not deduce output format from file extension: using MPEG.\n");
+        fmt = guess_format("mpeg", NULL, NULL);
+    }
+    if (!fmt) {
+        fprintf(stderr, "Could not find suitable output format\n");
+        exit(1);
+    }
+    
+    /* allocate the output media context */
+    oc = av_alloc_format_context();
+    if (!oc) {
+        fprintf(stderr, "Memory error\n");
+        exit(1);
+    }
+    oc->oformat = fmt;
+    snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
+
+    /* add the audio and video streams using the default format codecs
+       and initialize the codecs */
+    video_st = NULL;
+
+    /* purge the arguments not concerning VNC */
+    argv[1]=argv[i];
+    argc=2;
+    client->MallocFrameBuffer=resize;
+    client->GotFrameBufferUpdate=update;
+    if(!rfbInitClient(client,&argc,argv)) {
+	    fprintf(stderr,"Could not connect to server!\n");
+	    return 1;
+    }
+    
+    /* main loop */
+
+    while(!quit) {
+	int i=WaitForMessage(client,2000);
+	if(i<0) {
+		movie_close();
+		return 0;
+	}
+	if(i)
+		HandleRFBServerMessage(client);
+	else {
+	        /* compute current audio and video time */
+               	video_pts = (double)video_st->pts.val * video_st->time_base.num / video_st->time_base.den;
+
+        	/* write interleaved audio and video frames */
+	        write_video_frame(oc, video_st);
+	}
+	if(stop!=0 && stop<time(0))
+		break;
+    }
+
+    movie_close();
+    return 0;
+}