blackmagic Capture.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
#include <fcntl.h>

#include "DeckLinkAPI.h"
#include "Capture.h"

pthread_mutex_t					sleepMutex;
pthread_cond_t					sleepCond;
int								videoOutputFile = -1;
int								audioOutputFile = -1;

IDeckLink 						*deckLink;
IDeckLinkInput					*deckLinkInput;
IDeckLinkDisplayModeIterator	*displayModeIterator;

static BMDTimecodeFormat		g_timecodeFormat = 0;
static int						g_videoModeIndex = -1;
static int						g_audioChannels = 2;
static int						g_audioSampleDepth = 16;
const char *					g_videoOutputFile = NULL;
const char *					g_audioOutputFile = NULL;
static int						g_maxFrames = -1;

static unsigned long 			frameCount = 0;

DeckLinkCaptureDelegate::DeckLinkCaptureDelegate() : m_refCount(0)
{
	pthread_mutex_init(&m_mutex, NULL);
}

DeckLinkCaptureDelegate::~DeckLinkCaptureDelegate()
{
	pthread_mutex_destroy(&m_mutex);
}

ULONG DeckLinkCaptureDelegate::AddRef(void)
{
	pthread_mutex_lock(&m_mutex);
		m_refCount++;
	pthread_mutex_unlock(&m_mutex);

	return (ULONG)m_refCount;
}

ULONG DeckLinkCaptureDelegate::Release(void)
{
	pthread_mutex_lock(&m_mutex);
		m_refCount--;
	pthread_mutex_unlock(&m_mutex);

	if (m_refCount == 0)
	{
		delete this;
		return 0;
	}

	return (ULONG)m_refCount;
}

HRESULT DeckLinkCaptureDelegate::VideoInputFrameArrived(IDeckLinkVideoInputFrame* videoFrame, IDeckLinkAudioInputPacket* audioFrame)
{
	IDeckLinkVideoFrame*	                rightEyeFrame = NULL;
	IDeckLinkVideoFrame3DExtensions*        threeDExtensions = NULL;
	void*					frameBytes;
	void*					audioFrameBytes;
	
	// Handle Video Frame
	if(videoFrame)
	{	
		// If 3D mode is enabled we retreive the 3D extensions interface which gives.
		// us access to the right eye frame by calling GetFrameForRightEye() .
		if ( (videoFrame->QueryInterface(IID_IDeckLinkVideoFrame3DExtensions, (void **) &threeDExtensions) != S_OK) ||
			(threeDExtensions->GetFrameForRightEye(&rightEyeFrame) != S_OK))
		{
			rightEyeFrame = NULL;
		}
		
		if (threeDExtensions)
			threeDExtensions->Release();

		if (videoFrame->GetFlags() & bmdFrameHasNoInputSource)
		{
			fprintf(stderr, "Frame received (#%lu) - No input signal detected
", frameCount);
		}
		else
		{
			const char *timecodeString = NULL;
			if (g_timecodeFormat != 0)
			{
				IDeckLinkTimecode *timecode;
				if (videoFrame->GetTimecode(g_timecodeFormat, &timecode) == S_OK)
				{
					timecode->GetString(&timecodeString);
				}
			}

			fprintf(stderr, "Frame received (#%lu) [%s] - %s - Size: %li bytes
", 
				frameCount,
				timecodeString != NULL ? timecodeString : "No timecode",
				rightEyeFrame != NULL ? "Valid Frame (3D left/right)" : "Valid Frame", 
				videoFrame->GetRowBytes() * videoFrame->GetHeight());

			if (timecodeString)
				free((void*)timecodeString);
			
			if (videoOutputFile != -1)
			{
				videoFrame->GetBytes(&frameBytes);
				write(videoOutputFile, frameBytes, videoFrame->GetRowBytes() * videoFrame->GetHeight());
				
				if (rightEyeFrame)
				{
					rightEyeFrame->GetBytes(&frameBytes);
					write(videoOutputFile, frameBytes, videoFrame->GetRowBytes() * videoFrame->GetHeight());
				}
			}
		}
		
		if (rightEyeFrame)
			rightEyeFrame->Release();

		frameCount++;

		if (g_maxFrames > 0 && frameCount >= g_maxFrames)
		{
			pthread_cond_signal(&sleepCond);
		}
	}

	// Handle Audio Frame
	if (audioFrame)
	{
		if (audioOutputFile != -1)
		{
			audioFrame->GetBytes(&audioFrameBytes);
			write(audioOutputFile, audioFrameBytes, audioFrame->GetSampleFrameCount() * g_audioChannels * (g_audioSampleDepth / 8));
		}
	}
    return S_OK;
}

HRESULT DeckLinkCaptureDelegate::VideoInputFormatChanged(BMDVideoInputFormatChangedEvents events, IDeckLinkDisplayMode *mode, BMDDetectedVideoInputFormatFlags)
{
    return S_OK;
}

int usage(int status)
{
	HRESULT result;
	IDeckLinkDisplayMode *displayMode;
	int displayModeCount = 0;

	fprintf(stderr, 
		"Usage: Capture -m <mode id> [OPTIONS]
"
		"
"
		"    -m <mode id>:
"
	);

    while (displayModeIterator->Next(&displayMode) == S_OK)
    {
        char *          displayModeString = NULL;

        result = displayMode->GetName((const char **) &displayModeString);
        if (result == S_OK)
        {
			BMDTimeValue frameRateDuration, frameRateScale;
            displayMode->GetFrameRate(&frameRateDuration, &frameRateScale);

			fprintf(stderr, "        %2d:  %-20s 	 %li x %li 	 %g FPS
", 
				displayModeCount, displayModeString, displayMode->GetWidth(), displayMode->GetHeight(), (double)frameRateScale / (double)frameRateDuration);
			
            free(displayModeString);
			displayModeCount++;
        }

        // Release the IDeckLinkDisplayMode object to prevent a leak
        displayMode->Release();
    }

	fprintf(stderr, 
		"    -p <pixelformat>
" 
		"         0:  8 bit YUV (4:2:2) (default)
"
		"         1:  10 bit YUV (4:2:2)
"
		"         2:  10 bit RGB (4:4:4)
"
		"    -t <format>          Print timecode
"
		"     rp188:  RP 188
"
		"      vitc:  VITC
"
		"    serial:  Serial Timecode
"
		"    -f <filename>        Filename raw video will be written to
"
		"    -a <filename>        Filename raw audio will be written to
"
		"    -c <channels>        Audio Channels (2, 8 or 16 - default is 2)
"
		"    -s <depth>           Audio Sample Depth (16 or 32 - default is 16)
"
		"    -n <frames>          Number of frames to capture (default is unlimited)
"
		"    -3                   Capture Stereoscopic 3D (Requires 3D Hardware support)
"
		"
"
		"Capture video and/or audio to a file. Raw video and/or audio can be viewed with mplayer eg:
"
		"
"
		"    Capture -m2 -n 50 -f video.raw -a audio.raw
"
		"    mplayer video.raw -demuxer rawvideo -rawvideo pal:uyvy -audiofile audio.raw -audio-demuxer 20 -rawaudio rate=48000
"
	);

	exit(status);
}

int main(int argc, char *argv[])
{
	IDeckLinkIterator			*deckLinkIterator = CreateDeckLinkIteratorInstance();
	DeckLinkCaptureDelegate 	*delegate;
	IDeckLinkDisplayMode		*displayMode;
	BMDVideoInputFlags			inputFlags = 0;
	BMDDisplayMode				selectedDisplayMode = bmdModeNTSC;
	BMDPixelFormat				pixelFormat = bmdFormat8BitYUV;
	int							displayModeCount = 0;
	int							exitStatus = 1;
	int							ch;
	bool 						foundDisplayMode = false;
	HRESULT						result;
	
	pthread_mutex_init(&sleepMutex, NULL);
	pthread_cond_init(&sleepCond, NULL);
	
	if (!deckLinkIterator)
	{
		fprintf(stderr, "This application requires the DeckLink drivers installed.
");
		goto bail;
	}
	
	/* Connect to the first DeckLink instance */
	result = deckLinkIterator->Next(&deckLink);
	if (result != S_OK)
	{
		fprintf(stderr, "No DeckLink PCI cards found.
");
		goto bail;
	}
    
	if (deckLink->QueryInterface(IID_IDeckLinkInput, (void**)&deckLinkInput) != S_OK)
		goto bail;

	delegate = new DeckLinkCaptureDelegate();
	deckLinkInput->SetCallback(delegate);
   
	// Obtain an IDeckLinkDisplayModeIterator to enumerate the display modes supported on output
	result = deckLinkInput->GetDisplayModeIterator(&displayModeIterator);
	if (result != S_OK)
	{
		fprintf(stderr, "Could not obtain the video output display mode iterator - result = %08x
", result);
		goto bail;
	}
	
	// Parse command line options
	while ((ch = getopt(argc, argv, "?h3c:s:f:a:m:n:p:t:")) != -1) 
	{
		switch (ch) 
		{
			case 'm':
				g_videoModeIndex = atoi(optarg);
				break;
			case 'c':
				g_audioChannels = atoi(optarg);
				if (g_audioChannels != 2 &&
				    g_audioChannels != 8 &&
					g_audioChannels != 16)
				{
					fprintf(stderr, "Invalid argument: Audio Channels must be either 2, 8 or 16
");
					goto bail;
				}
				break;
			case 's':
				g_audioSampleDepth = atoi(optarg);
				if (g_audioSampleDepth != 16 && g_audioSampleDepth != 32)
				{
					fprintf(stderr, "Invalid argument: Audio Sample Depth must be either 16 bits or 32 bits
");
					goto bail;
				}
				break;
			case 'f':
				g_videoOutputFile = optarg;
				break;
			case 'a':
				g_audioOutputFile = optarg;
				break;
			case 'n':
				g_maxFrames = atoi(optarg);
				break;
			case '3':
				inputFlags |= bmdVideoInputDualStream3D;
				break;
			case 'p':
				switch(atoi(optarg))
				{
					case 0: pixelFormat = bmdFormat8BitYUV; break;
					case 1: pixelFormat = bmdFormat10BitYUV; break;
					case 2: pixelFormat = bmdFormat10BitRGB; break;
					default:
						fprintf(stderr, "Invalid argument: Pixel format %d is not valid", atoi(optarg));
						goto bail;
				}
				break;
			case 't':
				if (!strcmp(optarg, "rp188"))
					g_timecodeFormat = bmdTimecodeRP188Any;
    			else if (!strcmp(optarg, "vitc"))
					g_timecodeFormat = bmdTimecodeVITC;
    			else if (!strcmp(optarg, "serial"))
					g_timecodeFormat = bmdTimecodeSerial;
				else
				{
					fprintf(stderr, "Invalid argument: Timecode format "%s" is invalid
", optarg);
					goto bail;
				}
				break;
			case '?':
			case 'h':
				usage(0);
		}
	}

	if (g_videoModeIndex < 0)
	{
		fprintf(stderr, "No video mode specified
");
		usage(0);
	}

	if (g_videoOutputFile != NULL)
	{
		videoOutputFile = open(g_videoOutputFile, O_WRONLY|O_CREAT|O_TRUNC, 0664);
		if (videoOutputFile < 0)
		{
			fprintf(stderr, "Could not open video output file "%s"
", g_videoOutputFile);
			goto bail;
		}
	}
	if (g_audioOutputFile != NULL)
	{
		audioOutputFile = open(g_audioOutputFile, O_WRONLY|O_CREAT|O_TRUNC, 0664);
		if (audioOutputFile < 0)
		{
			fprintf(stderr, "Could not open audio output file "%s"
", g_audioOutputFile);
			goto bail;
		}
	}
	
	while (displayModeIterator->Next(&displayMode) == S_OK)
	{
		if (g_videoModeIndex == displayModeCount)
		{
			BMDDisplayModeSupport result;
			const char *displayModeName;
			
			foundDisplayMode = true;
			displayMode->GetName(&displayModeName);
			selectedDisplayMode = displayMode->GetDisplayMode();
			
			deckLinkInput->DoesSupportVideoMode(selectedDisplayMode, pixelFormat, bmdVideoInputFlagDefault, &result, NULL);

			if (result == bmdDisplayModeNotSupported)
			{
				fprintf(stderr, "The display mode %s is not supported with the selected pixel format
", displayModeName);
				goto bail;
			}

			if (inputFlags & bmdVideoInputDualStream3D)
			{
				if (!(displayMode->GetFlags() & bmdDisplayModeSupports3D))
				{
					fprintf(stderr, "The display mode %s is not supported with 3D
", displayModeName);
					goto bail;
				}
			}
			
			break;
		}
		displayModeCount++;
		displayMode->Release();
	}

	if (!foundDisplayMode)
	{
		fprintf(stderr, "Invalid mode %d specified
", g_videoModeIndex);
		goto bail;
	}

    result = deckLinkInput->EnableVideoInput(selectedDisplayMode, pixelFormat, inputFlags);
    if(result != S_OK)
    {
		fprintf(stderr, "Failed to enable video input. Is another application using the card?
");
        goto bail;
    }

    result = deckLinkInput->EnableAudioInput(bmdAudioSampleRate48kHz, g_audioSampleDepth, g_audioChannels);
    if(result != S_OK)
    {
        goto bail;
    }

	result = deckLinkInput->StartStreams();
    if(result != S_OK)
    {
        goto bail;
    }

	// All Okay.
	exitStatus = 0;
	
	// Block main thread until signal occurs
	pthread_mutex_lock(&sleepMutex);
	pthread_cond_wait(&sleepCond, &sleepMutex);
	pthread_mutex_unlock(&sleepMutex);
	fprintf(stderr, "Stopping Capture
");

bail:
   	
	if (videoOutputFile)
		close(videoOutputFile);
	if (audioOutputFile)
		close(audioOutputFile);
	
	if (displayModeIterator != NULL)
	{
		displayModeIterator->Release();
		displayModeIterator = NULL;
	}

    if (deckLinkInput != NULL)
    {
        deckLinkInput->Release();
        deckLinkInput = NULL;
    }

    if (deckLink != NULL)
    {
        deckLink->Release();
        deckLink = NULL;
    }

	if (deckLinkIterator != NULL)
		deckLinkIterator->Release();

    return exitStatus;
}

代码说明：

1. linux下，调用之前要判断设备和驱动是否正确

IDeckLinkIterator * deckLinkIterator = CreatedeckLinkIteratorInstance();

...

一直到 delegate = new DeckLinkCaptureDelegate();

2.. IDeckLinkIterator 类用来列举可用的设备

3. Next();可理解为找到卡，前面的是驱动

4.