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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
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<pre class="sourcecodebox">/*
File: CaptureAndCompressIPBMovie.c
Abstract: Shows how to capture video, recompress it on the fly with H.264 and
store the output in a movie file, using QuickTime 7's Compression Session APIs.
Shows how to capture audio using SGAudioMediaType SGChannel.
Version: 1.1
© Copyright 2005 Apple Computer, Inc. All rights reserved.
IMPORTANT: This Apple software is supplied to
you by Apple Computer, Inc. ("Apple") in
consideration of your agreement to the following
terms, and your use, installation, modification
or redistribution of this Apple software
constitutes acceptance of these terms. If you do
not agree with these terms, please do not use,
install, modify or redistribute this Apple
software.
In consideration of your agreement to abide by
the following terms, and subject to these terms,
Apple grants you a personal, non-exclusive
license, under Apple's copyrights in this
original Apple software (the "Apple Software"),
to use, reproduce, modify and redistribute the
Apple Software, with or without modifications, in
source and/or binary forms; provided that if you
redistribute the Apple Software in its entirety
and without modifications, you must retain this
notice and the following text and disclaimers in
all such redistributions of the Apple Software.
Neither the name, trademarks, service marks or
logos of Apple Computer, Inc. may be used to
endorse or promote products derived from the
Apple Software without specific prior written
permission from Apple. Except as expressly
stated in this notice, no other rights or
licenses, express or implied, are granted by
Apple herein, including but not limited to any
patent rights that may be infringed by your
derivative works or by other works in which the
Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS
IS" basis. APPLE MAKES NO WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING
THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE
OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY
SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE,
REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF
THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER
UNDER THEORY OF CONTRACT, TORT (INCLUDING
NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN
IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include <QuickTime/QuickTime.h>
#define ASK_SEQUENCE_GRABBER_TO_CONVERT_AUDIO_TO_AAC 0
// defines
#define BailErr(x) {err = x; if(err != noErr) goto bail;}
#define DisplayAndBail(x, y) {pMungData->err = x; if(x != noErr) { displayError(pMungData->pWindow, y, x); goto bail;}}
// constants
const EventTime kTimerInterval = kEventDurationSecond / 60; // idle timer interval
// mung data struct
typedef struct {
WindowRef pWindow; // window
int width; // dest width
int height; // dest height
CodecType codecType; // codec
SInt32 averageDataRate; // data rate
HIViewRef imageView; // for displaying decoded frames
ICMDecompressionSessionRef decompressionSession; // decompresses and scales captured frames
ICMCompressionSessionRef compressionSession; // compresses frames
Movie outputMovie; // movie file for storing compressed frames
Media outputVideoMedia; // media for our video track in the movie
DataHandler outputMovieDataHandler; // storage for movie header
CFURLRef outputMovieURL; // URL to the movie file (once we create it)
Boolean didBeginVideoMediaEdits;
Boolean verbose;
SeqGrabComponent seqGrab; // sequence grabber
TimeValue lastTime;
TimeScale timeScale;
int desiredFramesPerSecond;
TimeValue minimumFrameDuration;
long frameCount;
Boolean isGrabbing;
EventLoopTimerRef timerRef;
OSErr err;
SGChannel audioChan;
Media soundMedia;
Boolean didBeginSoundMediaEdits;
TimeScale audioTimeScale;
SoundDescriptionHandle audioDescH;
AudioStreamBasicDescription asbd;
} MungDataRecord, *MungDataPtr;
static MungDataPtr initializeMungData(WindowRef inWindow, Rect inBounds, SeqGrabComponent inSeqGrab);
static void disposeMungData(MungDataPtr pMungData);
static OSStatus setUpOutputMovie( MungDataPtr pMungData );
static void finishOutputMovie( MungDataPtr pMungData );
static void openOutputMovie( MungDataPtr pMungData );
// --------------------
// initializeMungData
//
static MungDataPtr initializeMungData(WindowRef inWindow, Rect inBounds, SeqGrabComponent inSeqGrab)
{
MungDataPtr pMungData = NULL;
HIViewRef contentView = NULL;
HIViewID kImageID = { 'IMAG', 0 };
OSErr err = noErr;
// allocate memory for the data
pMungData = (MungDataPtr)calloc(sizeof(MungDataRecord), 1);
if (MemError() || NULL == pMungData ) return NULL;
pMungData->pWindow = inWindow;
pMungData->width = inBounds.right - inBounds.left;
pMungData->height = inBounds.bottom - inBounds.top;
pMungData->codecType = kH264CodecType;
pMungData->averageDataRate = 100000; // 100 kbyte/sec == 800 kbit/sec
pMungData->desiredFramesPerSecond = 15;
pMungData->seqGrab = inSeqGrab;
pMungData->isGrabbing = false;
pMungData->verbose = false;
GetRootControl( pMungData->pWindow, &contentView );
HIViewFindByID( contentView, kImageID, &pMungData->imageView );
err = setUpOutputMovie( pMungData );
if( err )
goto bail;
return pMungData;
bail:
// clean up and get out
if (pMungData) {
disposeMungData(pMungData);
}
return NULL;
}
// --------------------
// disposeMungData
//
static void disposeMungData(MungDataPtr pMungData)
{
// clean up the bits
if(pMungData) {
if (pMungData->seqGrab)
CloseComponent(pMungData->seqGrab);
ICMDecompressionSessionRelease( pMungData->decompressionSession );
// It is important to push out any remaining frames before we release the compression session.
// If we knew the timestamp following the last source frame, you should pass it in here.
ICMCompressionSessionCompleteFrames( pMungData->compressionSession, true, 0, 0 );
ICMCompressionSessionRelease( pMungData->compressionSession );
if( pMungData->outputMovie ) {
finishOutputMovie( pMungData );
openOutputMovie( pMungData );
}
if( pMungData->outputMovieURL )
CFRelease( pMungData->outputMovieURL );
DisposeHandle((Handle)pMungData->audioDescH);
free((Ptr)pMungData);
pMungData = NULL;
}
}
static OSStatus promptForOutputMovieDataRef( Handle *dataRefOut, OSType *dataRefTypeOut )
{
OSStatus err = noErr;
NavDialogCreationOptions navOptions = { kNavDialogCreationOptionsVersion, 0, };
NavDialogRef navDialog = NULL;
NavReplyRecord navReply = { kNavReplyRecordVersion, };
AEDesc actualDesc = { 0, 0 };
FSRef parentFSRef;
err = NavGetDefaultDialogCreationOptions( &navOptions );
if( err )
goto bail;
navOptions.windowTitle = CFSTR("Save Captured Movie As...");
navOptions.message = CFSTR("Pick where to save the captured and compressed movie. (Make sure your camera is plugged in!)");
navOptions.saveFileName = CFSTR("captured.mov");
navOptions.modality = kWindowModalityAppModal;
err = NavCreatePutFileDialog( &navOptions, MovieFileType, 'TVOD', NULL, NULL, &navDialog );
if( err )
goto bail;
err = NavDialogRun( navDialog );
if( err )
goto bail;
if( kNavUserActionSaveAs != NavDialogGetUserAction( navDialog ) ) {
err = userCanceledErr;
goto bail;
}
err = NavDialogGetReply( navDialog, &navReply );
if( err )
goto bail;
err = AECoerceDesc( &navReply.selection, typeFSRef, &actualDesc );
if( err )
goto bail;
err = AEGetDescData( &actualDesc, &parentFSRef, sizeof( FSRef ) );
if( err )
goto bail;
err = QTNewDataReferenceFromFSRefCFString( &parentFSRef, navReply.saveFileName, 0, dataRefOut, dataRefTypeOut );
if( err ) {
fprintf( stderr, "QTNewDataReferenceFromFSRefCFString() failed (%d)\n", err );
goto bail;
}
bail:
NavDisposeReply( &navReply );
NavDialogDispose( navDialog );
AEDisposeDesc( &actualDesc );
return err;
}
static OSStatus setUpOutputMovie( MungDataPtr pMungData )
{
OSStatus err = noErr;
Handle outputMovieDataRef = NULL;
OSType outputMovieDataRefType = 0;
CFStringRef outputMovieFullPathString = NULL;
// Prompt the user for an output file.
err = promptForOutputMovieDataRef( &outputMovieDataRef, &outputMovieDataRefType );
if( err )
goto bail;
// Create a new movie file.
// If you're using CreateMovieFile, consider switching to CreateMovieStorage, which is long-file-name aware.
err = CreateMovieStorage( outputMovieDataRef, outputMovieDataRefType, 'TVOD', 0,
createMovieFileDeleteCurFile, &pMungData->outputMovieDataHandler, &pMungData->outputMovie );
if( err ) {
fprintf( stderr, "CreateMovieStorage failed (%d)\n", err );
goto bail;
}
// Remember a URL for the movie file so we can open it in QuickTime Player afterwards.
err = QTGetDataReferenceFullPathCFString( outputMovieDataRef, outputMovieDataRefType,
kQTPOSIXPathStyle, &outputMovieFullPathString );
if( err )
goto bail;
pMungData->outputMovieURL = CFURLCreateWithFileSystemPath( NULL, outputMovieFullPathString, kCFURLPOSIXPathStyle, false );
bail:
DisposeHandle( outputMovieDataRef );
if( outputMovieFullPathString )
CFRelease( outputMovieFullPathString );
return err;
}
static void finishOutputMovie(MungDataPtr pMungData)
{
OSStatus err = noErr;
Track videoTrack = NULL;
if( pMungData->didBeginVideoMediaEdits ) {
// End the media sample-adding session.
err = EndMediaEdits( pMungData->outputVideoMedia );
if( err ) {
fprintf( stderr, "EndMediaEdits() failed (%d)\n", err );
goto bail;
}
}
// Make sure things are extra neat.
ExtendMediaDecodeDurationToDisplayEndTime( pMungData->outputVideoMedia, NULL );
// Insert the stuff we added into the track, at the end.
videoTrack = GetMediaTrack( pMungData->outputVideoMedia );
err = InsertMediaIntoTrack( videoTrack,
GetTrackDuration(videoTrack),
0, GetMediaDisplayDuration( pMungData->outputVideoMedia ), // NOTE: use this instead of GetMediaDuration
fixed1 );
if( err ) {
fprintf( stderr, "InsertMediaIntoTrack() failed (%d)\n", err );
goto bail;
}
if ( pMungData->didBeginSoundMediaEdits )
{
err = EndMediaEdits( pMungData->soundMedia );
if( err ) {
fprintf( stderr, "EndMediaEdits(soundMedia) failed (%d)\n", err );
goto bail;
}
}
{
Track soundTrack = GetMediaTrack( pMungData->soundMedia );
TimeValue soundTrackDur, videoTrackDur;
err = InsertMediaIntoTrack( soundTrack, 0, 0, GetMediaDuration( pMungData->soundMedia ), fixed1 );
if ( err ) {
fprintf( stderr, "InsertMediaIntoTrack(soundTrack) failed (%d)\n", err );
goto bail;
}
// trim the sound track to the duration of the video track
// (no one likes white frames at the end of their movies)
soundTrackDur = GetTrackDuration(soundTrack);
videoTrackDur = GetTrackDuration(videoTrack);
if (soundTrackDur > videoTrackDur)
{
fprintf( stderr, "sound track ran long, soundTrackDur = %ld, videoTrackDur = %ld\n", soundTrackDur, videoTrackDur );
DeleteTrackSegment(soundTrack, videoTrackDur, soundTrackDur - videoTrackDur);
}
}
// Write the movie header to the file.
err = AddMovieToStorage( pMungData->outputMovie, pMungData->outputMovieDataHandler );
if( err ) {
fprintf( stderr, "AddMovieToStorage() failed (%d)\n", err );
goto bail;
}
CloseMovieStorage( pMungData->outputMovieDataHandler );
pMungData->outputMovieDataHandler = 0;
DisposeMovie( pMungData->outputMovie );
bail:
return;
}
static void openOutputMovie( MungDataPtr pMungData )
{
OSStatus err = noErr;
// Open the movie we've created in QuickTime Player.
err = LSOpenCFURLRef( pMungData->outputMovieURL, NULL );
bail:
return;
}
// --------------------
// makeSequenceGrabber
//
static SeqGrabComponent makeSequenceGrabber(WindowRef pWindow)
{
SeqGrabComponent seqGrab = NULL;
OSErr err = noErr;
// open the default sequence grabber
seqGrab = OpenDefaultComponent(SeqGrabComponentType, 0);
if (seqGrab != NULL) {
// initialize the default sequence grabber component
err = SGInitialize(seqGrab);
if (err == noErr)
// set its graphics world to the specified window
err = SGSetGWorld(seqGrab, GetWindowPort(pWindow), NULL);
if (err == noErr)
// specify the destination data reference for a record operation
// tell it we're not making a movie
// if the flag seqGrabDontMakeMovie is used, the sequence grabber still calls
// your data function, but does not write any data to the movie file
// writeType will always be set to seqGrabWriteAppend
err = SGSetDataRef(seqGrab,
0,
0,
seqGrabDontMakeMovie);
}
if (err && (seqGrab != NULL)) { // clean up on failure
CloseComponent(seqGrab);
seqGrab = NULL;
}
return seqGrab;
}
// --------------------
// makeSequenceGrabVideoChannel
//
static OSErr makeSequenceGrabVideoChannel(SeqGrabComponent seqGrab, SGChannel *sgchanVideo, Rect const *rect)
{
long flags = 0;
OSErr err = noErr;
err = SGNewChannel(seqGrab, VideoMediaType, sgchanVideo);
if (err == noErr) {
err = SGSetChannelBounds(*sgchanVideo, rect);
if (err == noErr)
// set usage for new video channel to avoid playthrough
// note we don't set seqGrabPlayDuringRecord
err = SGSetChannelUsage(*sgchanVideo, flags | seqGrabRecord);
if (err != noErr) {
// clean up on failure
SGDisposeChannel(seqGrab, *sgchanVideo);
*sgchanVideo = NULL;
}
}
return err;
}
// --------------------
// makeSequenceGrabAudioChannel
//
static OSErr makeSequenceGrabAudioChannel(SeqGrabComponent seqGrab, SGChannel *sgchanAudio)
{
OSErr err = noErr;
err = SGNewChannel(seqGrab, SGAudioMediaType, sgchanAudio);
if (err == noErr) {
// set usage for new audio channel.
// We will use the SGAudioChannel's built in mechanism for previewing
// by adding the seqGrabPlayDuringRecord flag
err = SGSetChannelUsage(*sgchanAudio, seqGrabRecord | seqGrabPlayDuringRecord);
if (err == noErr)
{
// By default, the device from which the SGAudioChannel captures is
// the audio portion of your selected video device. If your video device
// has no audio recording capabilities, SGAudioChannel will capture from
// the default device specified in your system-wide audio settings, found
// in /Applications/Utilities/Audio Midi Setup.app
// If you are recording live from a microphone (i.e. the built in microphone
// on an iSight camera), chances are good that your microphone is
// situated in close proximity to the speakers through which you will
// be previewing the audio -- which may introduce a feedback loop.
// To prevent this, we can set the master gain of the preview device
// to be very low (NOTE - the gain is adjusted in software. The physical
// volume of your playback device will not be altered).
Float32 lowVolume = 0.05; // 1.0 is full, 0.0 is muted
err = QTSetComponentProperty(*sgchanAudio, kQTPropertyClass_SGAudioPreviewDevice,
kQTSGAudioPropertyID_MasterGain,
sizeof(lowVolume), &lowVolume);
}
#if ASK_SEQUENCE_GRABBER_TO_CONVERT_AUDIO_TO_AAC
if (err == noErr)
{
AudioStreamBasicDescription outputFormat;
// get the current output format, so we carry over the source
// sample rate. we'll mix down to stereo if there are > 2 source
// channels.
err = QTGetComponentProperty(*sgchanAudio, kQTPropertyClass_SGAudio,
kQTSGAudioPropertyID_StreamFormat,
sizeof(outputFormat), &outputFormat, NULL);
if (err == noErr)
{
outputFormat.mFormatID = 'aac ';
if (outputFormat.mChannelsPerFrame > 2)
outputFormat.mChannelsPerFrame = 2;
outputFormat.mBitsPerChannel = 0;
outputFormat.mBytesPerFrame = 0;
outputFormat.mBytesPerPacket = 0;
outputFormat.mFormatFlags = 0;
outputFormat.mFramesPerPacket = 0; // Sequence Grabber will fill in the fields we don't know.
err = QTSetComponentProperty(*sgchanAudio, kQTPropertyClass_SGAudio,
kQTSGAudioPropertyID_StreamFormat,
sizeof(outputFormat), &outputFormat);
}
}
#endif
// See QuickTimeComponents.h for a full list of the SGAudioChannel's configurable
// properties. Search for SGAudioMediaType
if (err != noErr) {
// clean up on failure
SGDisposeChannel(seqGrab, *sgchanAudio);
*sgchanAudio = NULL;
}
}
return err;
}
static void displayError(WindowRef inWindow, char inStr[], OSErr inError)
{
// set the window title to display the error
char errMsg[64];
sprintf(errMsg, "%s: %d", inStr, inError);
CopyCStringToPascal(errMsg, (unsigned char *)&errMsg);
SetWTitle(inWindow, (unsigned char *)errMsg);
}
static OSStatus createDecompressionSession(
ImageDescriptionHandle imageDesc,
int width,
int height,
OSType pixelFormat,
ICMDecompressionTrackingCallback trackingCallback,
void *trackingRefCon,
ICMDecompressionSessionRef *decompressionSessionOut )
{
OSStatus err = noErr;
CFNumberRef number = NULL;
CFMutableDictionaryRef pixelBufferAttributes = NULL;
ICMDecompressionSessionOptionsRef sessionOptions = NULL;
ICMDecompressionTrackingCallbackRecord trackingCallbackRecord;
// Make a CFDictionary that describes the pixel buffers we want the decompression session to output.
// We want them to be the right dimensions and pixel format; we want them to be compatible with
// CGBitmapContext and CGImage.
// Note: if we didn't need to draw on frames with CG or display the frames in an HIImageView, we
// could improve performance by getting the compression session's preferred pixel buffer attributes
// via the kICMCompressionSessionPropertyID_CompressorPixelBufferAttributes property
// and passing that when creating the decompression session.
pixelBufferAttributes = CFDictionaryCreateMutable( NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks );
number = CFNumberCreate( NULL, kCFNumberIntType, &width );
CFDictionaryAddValue( pixelBufferAttributes, kCVPixelBufferWidthKey, number );
CFRelease( number );
number = CFNumberCreate( NULL, kCFNumberIntType, &height );
CFDictionaryAddValue( pixelBufferAttributes, kCVPixelBufferHeightKey, number );
CFRelease( number );
number = CFNumberCreate( NULL, kCFNumberSInt32Type, &pixelFormat );
CFDictionaryAddValue( pixelBufferAttributes, kCVPixelBufferPixelFormatTypeKey, number );
CFRelease( number );
CFDictionaryAddValue( pixelBufferAttributes, kCVPixelBufferCGBitmapContextCompatibilityKey, kCFBooleanTrue );
CFDictionaryAddValue( pixelBufferAttributes, kCVPixelBufferCGImageCompatibilityKey, kCFBooleanTrue );
trackingCallbackRecord.decompressionTrackingCallback = trackingCallback;
trackingCallbackRecord.decompressionTrackingRefCon = trackingRefCon;
err = ICMDecompressionSessionCreate( NULL, imageDesc, sessionOptions,
pixelBufferAttributes, &trackingCallbackRecord, decompressionSessionOut );
if( err ) {
fprintf( stderr, "ICMDecompressionSessionCreate failed (%d)", err );
}
CFRelease( pixelBufferAttributes );
ICMDecompressionSessionOptionsRelease( sessionOptions );
return err;
}
static OSStatus
createCompressionSession(
int width, int height, CodecType codecType, SInt32 averageDataRate, TimeScale timeScale,
ICMEncodedFrameOutputCallback outputCallback, void *outputRefCon,
ICMCompressionSessionRef *compressionSessionOut )
{
OSStatus err = noErr;
ICMEncodedFrameOutputRecord encodedFrameOutputRecord = {0};
ICMCompressionSessionOptionsRef sessionOptions = NULL;
err = ICMCompressionSessionOptionsCreate( NULL, &sessionOptions );
if( err ) {
fprintf( stderr, "ICMCompressionSessionOptionsCreate() failed (%d)\n", err );
goto bail;
}
// We must set this flag to enable P or B frames.
err = ICMCompressionSessionOptionsSetAllowTemporalCompression( sessionOptions, true );
if( err ) {
fprintf( stderr, "ICMCompressionSessionOptionsSetAllowTemporalCompression() failed (%d)\n", err );
goto bail;
}
// We must set this flag to enable B frames.
err = ICMCompressionSessionOptionsSetAllowFrameReordering( sessionOptions, true );
if( err ) {
fprintf( stderr, "ICMCompressionSessionOptionsSetAllowFrameReordering() failed (%d)\n", err );
goto bail;
}
// Set the maximum key frame interval, also known as the key frame rate.
err = ICMCompressionSessionOptionsSetMaxKeyFrameInterval( sessionOptions, 30 );
if( err ) {
fprintf( stderr, "ICMCompressionSessionOptionsSetMaxKeyFrameInterval() failed (%d)\n", err );
goto bail;
}
// This allows the compressor more flexibility (ie, dropping and coalescing frames).
err = ICMCompressionSessionOptionsSetAllowFrameTimeChanges( sessionOptions, true );
if( err ) {
fprintf( stderr, "ICMCompressionSessionOptionsSetAllowFrameTimeChanges() failed (%d)\n", err );
goto bail;
}
// We need durations when we store frames.
err = ICMCompressionSessionOptionsSetDurationsNeeded( sessionOptions, true );
if( err ) {
fprintf( stderr, "ICMCompressionSessionOptionsSetDurationsNeeded() failed (%d)\n", err );
goto bail;
}
// Set the average data rate.
err = ICMCompressionSessionOptionsSetProperty( sessionOptions,
kQTPropertyClass_ICMCompressionSessionOptions,
kICMCompressionSessionOptionsPropertyID_AverageDataRate,
sizeof( averageDataRate ),
&averageDataRate );
if( err ) {
fprintf( stderr, "ICMCompressionSessionOptionsSetProperty(AverageDataRate) failed (%d)\n", err );
goto bail;
}
encodedFrameOutputRecord.encodedFrameOutputCallback = outputCallback;
encodedFrameOutputRecord.encodedFrameOutputRefCon = outputRefCon;
encodedFrameOutputRecord.frameDataAllocator = NULL;
err = ICMCompressionSessionCreate( NULL, width, height, codecType, timeScale,
sessionOptions, NULL, &encodedFrameOutputRecord, compressionSessionOut );
if( err ) {
fprintf( stderr, "ICMCompressionSessionCreate() failed (%d)\n", err );
goto bail;
}
bail:
ICMCompressionSessionOptionsRelease( sessionOptions );
return err;
}
// Utility to wrap a CGBitmapContext around a 32ARGB CVPixelBuffer.
static OSStatus
createCGBitmapContextFor32ARGBCVPixelBuffer(
CVPixelBufferRef pixelBuffer,
CGContextRef *contextOut )
{
size_t width, height, rowBytes;
void *baseAddr;
OSStatus err;
CGColorSpaceRef colorspace = NULL;
CGContextRef context = NULL;
err = CVPixelBufferLockBaseAddress( pixelBuffer, 0 );
if( err ) {
fprintf( stderr, "CVPixelBufferLockBaseAddress() failed (%d)\n", err );
goto bail;
}
rowBytes = CVPixelBufferGetBytesPerRow( pixelBuffer );
baseAddr = CVPixelBufferGetBaseAddress( pixelBuffer );
width = CVPixelBufferGetWidth( pixelBuffer );
height = CVPixelBufferGetHeight( pixelBuffer );
colorspace = CGColorSpaceCreateDeviceRGB();
context = CGBitmapContextCreate( baseAddr, width, height,
8, rowBytes, colorspace, kCGImageAlphaPremultipliedFirst );
*contextOut = context;
context = NULL;
bail:
if( colorspace ) CGColorSpaceRelease( colorspace );
if( context ) CGContextRelease( context );
return err;
}
static void
unlockCVPixelBufferAndReleaseCGBitmapContext(
CVPixelBufferRef pixelBuffer,
CGContextRef context )
{
CGContextRelease( context );
CVPixelBufferUnlockBaseAddress( pixelBuffer, 0 );
}
// Utility to draw a string left- or right- justified with a stroked border in one color, filled with another color.
enum Justify {
kLeftJustify, kRightJustify
};
static void showString( CGContextRef c, float x, float y, enum Justify justify, const char *str)
{
CGPoint after;
CGContextSaveGState( c );
if( kRightJustify == justify ) {
CGContextSetTextPosition( c, 0, 0 );
CGContextSetTextDrawingMode( c, kCGTextInvisible );
CGContextShowText( c, str, strlen( str ) );
after = CGContextGetTextPosition( c );
x = x - after.x;
y = y - after.y;
}
CGContextSetTextPosition( c, x, y );
CGContextSetTextDrawingMode( c, kCGTextFillStroke );
CGContextShowText( c, str, strlen( str ) );
CGContextRestoreGState( c );
}
// Draw "LIVE" and the number of seconds into the capture on the pixel buffer.
static void drawOnPixelBuffer( CVPixelBufferRef pixelBuffer, TimeValue64 displayTime, TimeScale timeScale )
{
CGContextRef context = NULL;
if( noErr == createCGBitmapContextFor32ARGBCVPixelBuffer( pixelBuffer, &context ) ) {
int width = CVPixelBufferGetWidth( pixelBuffer );
int timeInSeconds = displayTime / timeScale;
char buf[100];
sprintf( buf, "%d:%02d", timeInSeconds / 60, timeInSeconds % 60 );
CGContextSelectFont( context, "Arial-Black", 32, kCGEncodingMacRoman );
CGContextSetLineWidth( context, 1.5 );
CGContextSetRGBStrokeColor( context, 1.0, 1.0, 1.0, 1.0 ); // white
CGContextSetRGBFillColor( context, 0.2, 0.0, 0.0, 1.0 ); // dark red
showString( context, 10, 10, kLeftJustify, "LIVE" );
CGContextSetRGBFillColor( context, 0.0, 0.0, 0.3, 1.0 ); // dark blue
showString( context, width-10, 10, kRightJustify, buf );
unlockCVPixelBufferAndReleaseCGBitmapContext( pixelBuffer, context );
}
}
// Utility to wrap a CGImage around a 32ARGB CVPixelBuffer.
static void releaseAndUnlockThis( void *info, const void *data, size_t size )
{
CVPixelBufferRef pixelBuffer = info;
CVPixelBufferUnlockBaseAddress( pixelBuffer, 0 );
CVBufferRelease( pixelBuffer );
}
static CGImageRef createCGImageFrom32XRGBCVPixelBuffer( CVPixelBufferRef pixelBuffer )
{
size_t width, height, rowBytes;
void *baseAddr = NULL;
CGColorSpaceRef colorspace = NULL;
CGDataProviderRef provider = NULL;
CGImageRef image = NULL;
CVPixelBufferLockBaseAddress( pixelBuffer, 0 );
rowBytes = CVPixelBufferGetBytesPerRow( pixelBuffer );
baseAddr = CVPixelBufferGetBaseAddress( pixelBuffer );
width = CVPixelBufferGetWidth( pixelBuffer );
height = CVPixelBufferGetHeight( pixelBuffer );
colorspace = CGColorSpaceCreateDeviceRGB();
CVBufferRetain( pixelBuffer );
provider = CGDataProviderCreateWithData( pixelBuffer, baseAddr, rowBytes * height, releaseAndUnlockThis );
image = CGImageCreate( width, height, 8, 32, rowBytes, colorspace,
kCGImageAlphaNoneSkipFirst, provider, NULL, true, kCGRenderingIntentDefault );
bail:
if( provider ) CGDataProviderRelease( provider );
if( colorspace ) CGColorSpaceRelease( colorspace );
return image;
}
// Replace the image in an HIImageView and force it to be displayed immediately.
static void putCGImageInHIImageView( CGImageRef image, HIViewRef imageView )
{
OSStatus err;
if( imageView ) {
// Pass our view the new image
err = HIImageViewSetImage( imageView, image );
err = HIViewSetNeedsDisplay( imageView, true );
err = HIViewRender( imageView );
err = HIWindowFlush( HIViewGetWindow( imageView ) );
}
}
// The tracking callback function for the decompression session.
// Draw on pixel buffers, display them in the window and feed them to the compression session.
static void
displayAndCompressFrame(
void *decompressionTrackingRefCon,
OSStatus result,
ICMDecompressionTrackingFlags decompressionTrackingFlags,
CVPixelBufferRef pixelBuffer,
TimeValue64 displayTime,
TimeValue64 displayDuration,
ICMValidTimeFlags validTimeFlags,
void *reserved,
void *sourceFrameRefCon )
{
OSStatus err = noErr;
MungDataPtr pMungData = (MungDataPtr)decompressionTrackingRefCon;
if( kICMDecompressionTracking_ReleaseSourceData & decompressionTrackingFlags ) {
// if we were responsible for managing source data buffers, we should release the source buffer here,
// using sourceFrameRefCon to identify it.
}
if( ( kICMDecompressionTracking_EmittingFrame & decompressionTrackingFlags ) && pixelBuffer ) {
ICMCompressionFrameOptionsRef frameOptions = NULL;
CGImageRef image = NULL;
// Draw in the corner of the pixelBuffer.
drawOnPixelBuffer( pixelBuffer, displayTime, pMungData->timeScale );
// Display the frame in the imageView.
image = createCGImageFrom32XRGBCVPixelBuffer( pixelBuffer );
putCGImageInHIImageView( image, pMungData->imageView );
if( image ) CFRelease( image );
// Feed the frame to the compression session.
err = ICMCompressionSessionEncodeFrame( pMungData->compressionSession, pixelBuffer,
displayTime, displayDuration, validTimeFlags,
frameOptions, NULL, NULL );
if( err ) {
fprintf( stderr, "ICMCompressionSessionEncodeFrame() failed (%d)\n", err );
}
}
}
// Create a video track and media to hold encoded frames.
// This is called the first time we get an encoded frame back from the compression session.
static OSStatus
createVideoMedia(
MungDataPtr pMungData,
ImageDescriptionHandle imageDesc,
TimeScale timescale )
{
OSStatus err = noErr;
Fixed trackWidth, trackHeight;
Track outputTrack = NULL;
err = ICMImageDescriptionGetProperty(
imageDesc,
kQTPropertyClass_ImageDescription,
kICMImageDescriptionPropertyID_ClassicTrackWidth,
sizeof( trackWidth ),
&trackWidth,
NULL );
if( err ) {
fprintf( stderr, "ICMImageDescriptionGetProperty(kICMImageDescriptionPropertyID_DisplayWidth) failed (%d)\n", err );
goto bail;
}
err = ICMImageDescriptionGetProperty(
imageDesc,
kQTPropertyClass_ImageDescription,
kICMImageDescriptionPropertyID_ClassicTrackHeight,
sizeof( trackHeight ),
&trackHeight,
NULL );
if( err ) {
fprintf( stderr, "ICMImageDescriptionGetProperty(kICMImageDescriptionPropertyID_DisplayHeight) failed (%d)\n", err );
goto bail;
}
if( pMungData->verbose ) {
printf( "creating %g x %g track\n", Fix2X(trackWidth), Fix2X(trackHeight) );
}
outputTrack = NewMovieTrack( pMungData->outputMovie, trackWidth, trackHeight, 0 );
err = GetMoviesError();
if( err ) {
fprintf( stderr, "NewMovieTrack() failed (%d)\n", err );
goto bail;
}
pMungData->outputVideoMedia = NewTrackMedia( outputTrack, VideoMediaType, timescale, 0, 0 );
err = GetMoviesError();
if( err ) {
fprintf( stderr, "NewTrackMedia() failed (%d)\n", err );
goto bail;
}
err = BeginMediaEdits( pMungData->outputVideoMedia );
if( err ) {