iOS picture to video

Transferred from: http://blog.iosxcode4.com/archives/160

The framework used is:

Mediaplayer.framework,quartzcore.framework,corevideoframework,coremedia.framework,avfoundation.framework

The code is as follows:

- (CVPixelBufferRef )pixelBufferFromCGImage:(CGImageRef)image size:(CGSize)size
{
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
[NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey, nil];
CVPixelBufferRef pxbuffer = NULL;
CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, size.width, size.height, kCVPixelFormatType_32ARGB, (CFDictionaryRef) options, &pxbuffer);

Nsparameterassert (Status = = Kcvreturnsuccess && pxbuffer! = NULL);

Cvpixelbufferlockbaseaddress (pxbuffer, 0);
void *pxdata = Cvpixelbuffergetbaseaddress (Pxbuffer);
Nsparameterassert (Pxdata! = NULL);

Cgcolorspaceref rgbcolorspace = Cgcolorspacecreatedevicergb ();
Cgcontextref context = Cgbitmapcontextcreate (Pxdata, Size.width, Size.Height, 8, 4*size.width, Rgbcolorspace, Kcgimagealphapremultipliedfirst);
Nsparameterassert (context);

Cgcontextdrawimage (context, CGRectMake (0, 0, cgimagegetwidth (image), cgimagegetheight (image)), image);

Cgcolorspacerelease (Rgbcolorspace);
Cgcontextrelease (context);

Cvpixelbufferunlockbaseaddress (pxbuffer, 0);

return pxbuffer;
}

-(Ibaction) testcompressionsession
{
NSString *moviepath = [[NSBundle mainbundle] pathforresource:@ "Movie" oftype:@ "mov"];

Cgsize size = Cgsizemake (320,400);//define Video sizes

Nserror *error = nil;

Unlink ([betacompressiondirectory utf8string]);

--initialize compression engine
Avassetwriter *videowriter = [[Avassetwriter alloc] Initwithurl:[nsurl fileurlwithpath:betacompressiondirectory]
Filetype:avfiletypequicktimemovie
error:&error];
Nsparameterassert (Videowriter);
if (Error)
NSLog (@ "error =%@", [Error localizeddescription]);

Nsdictionary *videosettings = [Nsdictionary dictionarywithobjectsandkeys:avvideocodech264, AVVideoCodecKey,
[NSNumber NumberWithInt:size.width], Avvideowidthkey,
[NSNumber NumberWithInt:size.height], avvideoheightkey, nil];
Avassetwriterinput *writerinput = [Avassetwriterinput assetwriterinputwithmediatype:avmediatypevideo outputSettings : Videosettings];

Nsdictionary *sourcepixelbufferattributesdictionary = [Nsdictionary dictionarywithobjectsandkeys:[nsnumber NUMBERWITHINT:KCVPIXELFORMATTYPE_32ARGB], Kcvpixelbufferpixelformattypekey, nil];

Avassetwriterinputpixelbufferadaptor *adaptor = [Avassetwriterinputpixelbufferadaptor
Assetwriterinputpixelbufferadaptorwithassetwriterinput:writerinput sourcepixelbufferattributes: Sourcepixelbufferattributesdictionary];
Nsparameterassert (Writerinput);
Nsparameterassert ([Videowriter canaddinput:writerinput]);

if ([Videowriter canaddinput:writerinput])
NSLog (@ "");
Else
NSLog (@ "");

[Videowriter Addinput:writerinput];

[Videowriter startwriting];
[Videowriter Startsessionatsourcetime:kcmtimezero];

Synthesize multiple pictures as a video file
dispatch_queue_t dispatchqueue = dispatch_queue_create ("Mediainputqueue", NULL);
int __block frame = 0;

[Writerinput requestmediadatawhenreadyonqueue:dispatchqueue usingblock:^{
while ([Writerinput Isreadyformoremediadata])
{
if (++frame >= [Imagearr count]*10)
{
[Writerinput markasfinished];
[Videowriter finishwriting];
[Videowriter release];
Break
}

Cvpixelbufferref buffer = NULL;

int idx = FRAME/10;

Buffer = (cvpixelbufferref) [self Pixelbufferfromcgimage:[[imagearr objectatindex:idx] cgimage] size:size];

if (buffer)
{
if (![ Adaptor Appendpixelbuffer:buffer Withpresentationtime:cmtimemake (frame, 10)])
NSLog (@ "FAIL");
Else
Cfrelease (buffer);
}

}
}];
}