spcaview.c

本软件代码是基于linux下进行语音播放、视频显示的一段代码！是开发嵌入式设备的非常好的例子程序

			if (streamid >= 0){
				printf("StreamId: %s Camera\n",Plist[streamid].name);
			} else {
				printf("StreamId: %d Unknow Camera\n",streamid);
			} 
			/* test jpeg capability if not and jpeg ask without raw data 
			set default format to YUVP */
			if ((format == VIDEO_PALETTE_RAW_JPEG || format == VIDEO_PALETTE_JPEG )&& streamid != JPEG && videoOn) {
				printf ("Camera unable to stream in JPEG mode switch to YUV420P\n");
				format = VIDEO_PALETTE_YUV420P;
			}
			if(probeSize(videochan.name,&image_width,&image_height) < 0)
				printf("unable to probe size !!\n");
			}
		printf("*****************************************************\n");
		/* Init grab method mmap */
		if (grabMethod) {
			printf(" grabbing method default MMAP asked \n");
			// MMAP VIDEO acquisition
			memset (&videombuf, 0, sizeof (videombuf));
			if (ioctl (fd, VIDIOCGMBUF, &videombuf) < 0) {
				perror (" init VIDIOCGMBUF FAILED\n");
			}
			printf ("VIDIOCGMBUF size %d  frames %d  offets[0]=%d offsets[1]=%d\n", videombuf.size, videombuf.frames, videombuf.offsets[0], videombuf.offsets[1]);
			
			pFramebuffer =
				(unsigned char *) mmap (0, videombuf.size,
							PROT_READ | PROT_WRITE,
							MAP_SHARED, fd, 0);
			mmapsize = videombuf.size;
			vmmap.height = image_height;
			vmmap.width = image_width;
			vmmap.format = format;
			for (f = 0; f < videombuf.frames; f++) {
				vmmap.frame = f;
				if (ioctl (fd, VIDIOCMCAPTURE, &vmmap)) {
					perror ("cmcapture");
				}
			}
			vmmap.frame = 0;
			/* Compute the estimate frame size we expect that jpeg compress factor 10 
			if ((format == VIDEO_PALETTE_RAW_JPEG) && videoOn)
				frame_size =
					videombuf.size / (10 *
							  videombuf.frames);
			else
				frame_size = videombuf.size / videombuf.frames;
			*/
		} else {
			/* read method */
			printf(" grabbing method READ asked \n");
			if (ioctl (fd, VIDIOCGWIN, &videowin) < 0)
				perror ("VIDIOCGWIN failed \n");
			videowin.height = image_height;
			videowin.width = image_width;
			if (ioctl (fd, VIDIOCSWIN, &videowin) < 0)
				perror ("VIDIOCSWIN failed \n");
			printf ("VIDIOCGWIN height %d  width %d \n",
				videowin.height, videowin.width);
			
		}
		switch (format) {
				case VIDEO_PALETTE_JPEG:{
					frame_size = image_width * image_height;
				}
				break;
				case VIDEO_PALETTE_RAW_JPEG:{
					frame_size = image_width *
							image_height * 3;
					}
					break;
				case VIDEO_PALETTE_YUV420P:{
						frame_size =
							(image_width *
							 image_height * 3) >> 1;
					}
					break;
				case VIDEO_PALETTE_RGB565:
				case VIDEO_PALETTE_RGB24:
				case VIDEO_PALETTE_RGB32:{
						frame_size =
							image_width *
							image_height * bpp;
					}
					break;
				default:
					break;

			}
		/* struct video_picture VIDIOCGPICT VIDIOCSPICT */
		if (ioctl (fd, VIDIOCGPICT, &videopict) < 0) {
			perror ("Couldnt get videopict params with VIDIOCGPICT\n");
		}
		printf ("VIDIOCGPICT\n");
		printf("brightnes=%d hue=%d color=%d contrast=%d whiteness=%d \n" ,
		 videopict.brightness, videopict.hue, videopict.colour, videopict.contrast, videopict.whiteness);
		printf("depth=%d palette=%d\n", videopict.depth, videopict.palette);
		
		videopict.palette = format;
		videopict.depth = bpp * 8;
		//videopict.brightness = INIT_BRIGHT;
		sleep (1);
		setVideoPict (&videopict, fd);


		/*
		 * Initialize the display 
		 */
if ( decodeOn && videoOn )
			{	/* Display data */
		pscreen =
			SDL_SetVideoMode (owidth, oheight, testbpp,
					  SDL_SWSURFACE);
		if (pscreen == NULL) {
			printf ("Couldn't set %d*%dx%d video mode: %s\n",
				owidth, oheight,3 * 8,
				SDL_GetError ());
			exit (1);
		}
//		SDL_WM_SetCaption ("Spcaview Grabber ", NULL);
SDL_WM_SetCaption (videocap.name, NULL);
}
		printf ("\n");
		time = SDL_GetTicks ();
		prevtime = time;

		/* If need open the avi file and alloc jpegbuffer */
		if (outputfile) {
			jpegData = malloc (frame_size);
			dpshDest = malloc(frame_size);
			if ((out_fd =
			     AVI_open_output_file (outputfile)) == NULL) {
				printf ("cannot open write file ? \n");
				exit (1);
			}
			if(interval){
			/* picture goes in avi */
			AVI_set_video (out_fd, image_width, image_height, 1,
				       "MJPG");
			mypict.mode = AVIPICT;
			mypict.out_fd = out_fd;
			} else {
			AVI_set_video (out_fd, image_width, image_height, 20,
				       fourcc);
				       }
			if (audioout && !interval) {
			/* init the sound recorder if no picture*/
			spec.format=AUDIO_FORMAT;
  			spec.freq=AUDIO_SAMPLERATE;
  			spec.callback=callback_record;
  			spec.samples=AUDIO_SAMPLES;
  			spec.channels=1;
  			spec.userdata=(void*)&RingBuffer;
			if(SDL_InitAudioIn()<0)
  				{
   				 fprintf(stderr,"Couldn't initialize SDL_AudioIn: %s\n",SDL_GetError());
    				 SDL_Quit();
   				 return(2);
  				}
			 if(SDL_OpenAudioIn(&spec,&result)<0)
  				{
   				 fprintf(stderr,"Couldn't open audio input device: %s\n",SDL_GetError());
   				 SDL_CloseAudioIn();
    				 SDL_Quit();
  				}
			AVI_set_audio (out_fd, spec.channels, spec.freq,
					       16, WAVE_AUDIO_PCM);
			//printf ("audio record setting channel %d frequency %d format %d",spec.channels, spec.freq, WAVE_AUDIO_PCM);
			
			// SDL_PauseAudioIn(0); // start record		
			initAudio = 1;
			}
		}

		/* Allocate tmp buffer for one frame. */

		tmp = (unsigned char*)malloc (frame_size);
		/* laugth the picture thread */
		mypict.data = malloc(frame_size);
		mypict.sizeIn = frame_size;
		mypict.width = image_width;
		mypict.height = image_height;
		mypict.formatIn = format;
		pthread_mutex_init(&mypict.mutex, NULL);
		pthread_cond_init(&mypict.cond, NULL);
		wstatus = pthread_create (&waitandshoot_id, NULL, (void *) waitandshoot, &mypict);
    		if (wstatus != 0) {
			fprintf(stderr,"thread shoot Create error!\n");
			exit(-1);
		}
	
	 	if (interval && videoOn){
			// set_timer(interval);
			/* allocate the buffer for photos */
			
			if (outputfile) {
				mypict.mode = AVIPICT;
			} else {
				mypict.mode = PICTURE;
			}
			
			SDL_SetTimer((Uint32) interval,callback_timer);
			 }
		i = 0;
		
		while (run && Oneshoot) {
			memset(tmp,0x00,frame_size);
			intime = SDL_GetTicks ();
			pictime = intime - delaytime;
			delaytime = intime;
			/* Try to synchronize sound with frame rate */
			if (initAudio && i > 9){
					initAudio = 0;
					SDL_PauseAudioIn(0); // start record
				}
			/* compute bytes sound */
			if (pictime < 100) {
				
				bytes_per_read =
					((AUDIO_SAMPLERATE / 1000) * 2 * pictime);
			}
			i++;
			if (grabMethod) {
				ff = vmmap.frame;
				if (ioctl (fd, VIDIOCSYNC, &ff) < 0) {
					perror ("cvsync err\n");
				}
				vmmap.frame = ff;
				memcpy (tmp,
					pFramebuffer +
					videombuf.offsets[vmmap.frame],
					frame_size);
				if ((status =
				     ioctl (fd, VIDIOCMCAPTURE, &vmmap)) < 0) {
					perror ("cmcapture");
					printf (">>cmcapture err %d\n", status);
				}
				vmmap.frame =
					(vmmap.frame + 1) % videombuf.frames;
				
			} else {
				/* read method */
				len = read (fd, tmp, frame_size);
				// printf ("len %d asked %d \n",len,frame_size);
			}
			synctime = SDL_GetTicks ();
			/*here the frame is in tmp ready to used */
			if (pictFlag){
				wstatus = pthread_mutex_lock (&mypict.mutex);
    				if (wstatus != 0) {fprintf(stderr,"Lock error!\n"); exit(-1);}
     				memcpy (mypict.data,tmp,frame_size);	
				//printf("COND OK !!\n");
       				wstatus = pthread_cond_signal (&mypict.cond);
    				if (wstatus != 0) {fprintf(stderr,"Signal error!\n"); exit(-1);}
    				wstatus = pthread_mutex_unlock (&mypict.mutex);
    				if (wstatus != 0) {fprintf(stderr,"Unlock error!\n"); exit(-1);}
			}
			if ((outputfile) && (i > 10) && !interval) {
				/* Output video frame with the good format */
				switch (format) {
					case VIDEO_PALETTE_JPEG:{
						int fs = get_jpegsize (tmp , frame_size);
							if (AVI_write_frame (out_fd,
							     		    (unsigned char *)
							     		     tmp,
							    		     fs) < 0)
									printf ("write error on avi out \n");
									method = 0;
						}
						break;
					case VIDEO_PALETTE_RAW_JPEG:{
							
								if (AVI_write_frame
							    			(out_fd,
							     			(unsigned char *)
							     			tmp,
							    			 frame_size) < 0)
									printf ("write error on avi out \n");
							
						}
						break;
					case VIDEO_PALETTE_YUV420P:{
							if ( videocomp ) {

								memcpy( jpegData,tmp,frame_size);
								jpegSize=frame_size;
								/*jpegData is destroy here */
								dpsh_yuv_encode(jpegData, dpshDest, &jpegSize);

							// printf ("write DPSH Size %d \n", jpegSize);
							if (AVI_write_frame
									 (out_fd,
									(unsigned char *)
									dpshDest, jpegSize) < 0)
									printf ("write error on avi out \n");
							}else{
								if (AVI_write_frame
									 (out_fd,
									(unsigned char *)
									tmp,
									image_width *
									image_height *
									1.5) < 0)
									printf ("write error on avi out \n");
							}
						}
						break;
					case VIDEO_PALETTE_RGB565:
					case VIDEO_PALETTE_RGB24:
					case VIDEO_PALETTE_RGB32:{
							if (AVI_write_frame
							    (out_fd,
							     (unsigned char *)
							     tmp,
							     image_width *
							     image_height *
							     bpp) < 0)
								printf ("write error on avi out \n");
						}
						break;
					default:
						break;
				}
				/* write sound in avi */
				if (audioout) {
					//printf("bytes per read sound %d \n",bytes_per_read);
					SDL_LockAudio();
					ptread = RingBuffer.ptread;
					ptwrite = RingBuffer.ptwrite;
					SDL_UnlockAudio();
					if (ptwrite > ptread) {
					if (AVI_write_audio
						    (out_fd, (char *) RingBuffer.buffer+ptread,
						     ptwrite-ptread) < 0)
							printf (" write AVI error \n");
						 RingBuffer.ptread =  (RingBuffer.ptread + (ptwrite-ptread))%MAXBUFFERSIZE;	
					} else if (ptwrite < ptread ){
					if (AVI_write_audio
						    (out_fd, (char *) RingBuffer.buffer+ptread,
						     MAXBUFFERSIZE-ptread) < 0)
							printf (" write AVI error \n");
					if (AVI_write_audio
						    (out_fd, (char *) RingBuffer.buffer,
						     ptwrite) < 0)
							printf (" write AVI error \n");
					 RingBuffer.ptread =  (RingBuffer.ptread + ptwrite+(MAXBUFFERSIZE-ptread))%MAXBUFFERSIZE;		
					}
				
				}
				
			}

			compresstime =SDL_GetTicks ();

			
			
			if ( decodeOn && videoOn && (i > 10))
			{	/* Display data */
				p = pp = pscreen->pixels;
				
			  refresh_screen ( tmp, p, format,
			  image_width,image_height,owidth,oheight,image_width*image_height*bpp,autobright);
			  if (autobright)
			  	adjust_bright(&videopict, fd);
			  decodetime = SDL_GetTicks ();

			SDL_UpdateRect (pscreen, 0, 0, 0, 0);	//update the entire screen	
			
			} else {
			decodetime = SDL_GetTicks ();
			}
			
			/* increment the real frame count and update statistics */
			framecount++;

			total_decode_time += decodetime - synctime;
			average_decode_time = total_decode_time / framecount;

			if (!autobright && statOn){
// \r
				printf ("frames:%04d pict:%03dms synch:%03dms write/comp:%03dms decode:%03dms display:%03dms \n",
				 framecount, pictime, synctime-intime, compresstime-synctime, decodetime-compresstime,SDL_GetTicks ()-decodetime); 
			fflush (stdout);	 
			}
			
			if (SDL_PollEvent (&sdlevent) == 1) {
				switch (sdlevent.type) {
					case SDL_KEYDOWN:
						switch (sdlevent.key.keysym.sym) {
							case SDLK_b:
								videopict.
									brightness
									-=
									0x100;
								setVideoPict
									(&videopict,
									 fd);
								break;
							case SDLK_n:
								videopict.
									brightness
									+=
									0x100;
								setVideoPict
									(&videopict,
									 fd);
								break;
							case SDLK_c:
								videopict.colour -= 0x200;	// = saturation ?
								setVideoPict
									(&videopict,
									 fd);
								break;
							case SDLK_s:
							/* should get the next frame available */
								pictFlag = 1;
								break;
							case SDLK_v:
								videopict.colour += 0x200;	// = saturation ?
								setVideoPict
									(&videopict,
									 fd);
								break;
							case SDLK_w:
								videopict.
									contrast -= 0x200;	// -contrast
								setVideoPict
									(&videopict,
									 fd);
								break;
							case SDLK_x:
								videopict.
									contrast += 0x200;	// +contrast
								setVideoPict
									(&videopict,
									 fd);
								break;
							case SDLK_q:
								printf ("\nStop asked\n");
								run = 0;
								break;
							default:
								
								break;
						}
						break;
					case SDL_QUIT:
						run = 0;
						break;
				}
			}

		}
		
			if (audioout) {
			
				SDL_CloseAudioIn(); //stop record 
				printf ("free sound buffer\n");
			
			}
			if (interval && decodeOn && videoOn){
			// set_timer(interval);
			SDL_SetTimer((Uint32) 0, NULL);