// ImageCodecPreflight
// The base image decompressor gets additional information about the capabilities of your image
// decompressor component by calling ImageCodecPreflight. The base image decompressor uses this
// information when responding to a call to the ImageCodecPredecompress function,
// which the ICM makes before decompressing an image. You are required only to provide values for
// the wantedDestinationPixelSize and wantedDestinationPixelTypes fields and can also modify other
// fields if necessary.
pascal ComponentResult TextSubCodecPreflight(TextSubGlobals glob, CodecDecompressParams *p)
{
CodecCapabilities *capabilities = p->capabilities;
OSTypePtr formats = *glob->wantedDestinationPixelTypeH;
// Fill in formats for wantedDestinationPixelTypeH
// Terminate with an OSType value 0 - see IceFloe #7
// http://developer.apple.com/quicktime/icefloe/dispatch007.html
// we want ARGB because Quartz can use it easily
*formats++ = k32RGBAPixelFormat;
*formats++ = k32ARGBPixelFormat;
// Specify the minimum image band height supported by the component
// bandInc specifies a common factor of supported image band heights -
// if your component supports only image bands that are an even
// multiple of some number of pixels high report this common factor in bandInc
capabilities->bandMin = (**p->imageDescription).height;
capabilities->bandInc = capabilities->bandMin;
// Indicate the wanted destination using the wantedDestinationPixelTypeH previously set up
capabilities->wantedPixelSize = 0;
p->wantedDestinationPixelTypes = glob->wantedDestinationPixelTypeH;
// Specify the number of pixels the image must be extended in width and height if
// the component cannot accommodate the image at its given width and height
capabilities->extendWidth = 0;
capabilities->extendHeight = 0;
capabilities->flags |= codecCanAsync | codecCanAsyncWhen | codecCanScale;
capabilities->flags2 |= codecDrawsHigherQualityScaled;
if (!glob->ssa) {
Ptr ssaheader = NULL;
size_t ssaheadersize = 0;
if (!glob->colorSpace)
glob->colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
if ((**p->imageDescription).cType == kSubFormatSSA) {
long count;
glob->translateSRT = false;
CountImageDescriptionExtensionType(p->imageDescription,kSubFormatSSA,&count);
if (count == 1) {
Handle ssahand;
GetImageDescriptionExtension(p->imageDescription,&ssahand,kSubFormatSSA,1);
ssaheader = *ssahand;
ssaheadersize = GetHandleSize(ssahand);
}
}
glob->ssa = SubRendererCreate((**p->imageDescription).cType == kSubFormatSSA, ssaheader,
ssaheadersize, (**p->imageDescription).width,(**p->imageDescription).height);
}
return noErr;
}
ComponentResult XMRTPH264Packetizer_PreflightMedia(XMRTPH264PacketizerGlobals globals, OSType inMediaType,
SampleDescriptionHandle inSampleDescription)
{
ComponentResult err = noErr;
Handle avccExtension = NULL;
err = GetImageDescriptionExtension((ImageDescriptionHandle)inSampleDescription,
&avccExtension,
FOUR_CHAR_CODE('avcC'),
1);
if (err != noErr) {
printf("GetImageDescriptionExtension failed");
}
UInt8 *data = (UInt8 *)*avccExtension;
UInt16 *spsLengthData = (UInt16 *)&(data[6]);
UInt16 spsAtomLength = ntohs(spsLengthData[0]);
UInt32 ppsAtomLengthIndex = 9 + spsAtomLength;
UInt16 *ppsLengthData = (UInt16 *)&(data[ppsAtomLengthIndex]);
UInt16 ppsAtomLength = ntohs(ppsLengthData[0]);
globals->spsAtomData = malloc(spsAtomLength * sizeof(UInt8));
globals->ppsAtomData = malloc(ppsAtomLength * sizeof(UInt8));
UInt8 *src = &(data[8]);
memcpy(globals->spsAtomData, src, spsAtomLength);
globals->spsAtomLength = spsAtomLength;
src = &(data[ppsAtomLengthIndex + 2]);
memcpy(globals->ppsAtomData, src, ppsAtomLength);
globals->ppsAtomLength = ppsAtomLength;
/*printf("SPS: \n");
for (unsigned i = 0; i < spsAtomLength; i++) {
printf("%x ", globals->spsAtomData[i]);
}
printf("\n");*/
/*
printf("PPS: \n");
for (i = 0; i < ppsAtomLength; i++) {
printf("%x ", globals->ppsAtomData[i]);
}
printf("\n");*/
DisposeHandle(avccExtension);
return err;
}
OSErr init_theora_decoder(Theora_Globals glob, CodecDecompressParams *p)
{
OSErr err = noErr;
Handle ext;
//OggSerialNoAtom *atom;
Byte *ptrheader, *mCookie, *cend;
UInt32 mCookieSize;
CookieAtomHeader *aheader;
th_comment tc;
ogg_packet header, header_tc, header_cb;
if (glob->info_initialised) {
dbg_printf("--:Theora:- Decoder already initialised, skipping...\n");
return err;
}
err = GetImageDescriptionExtension(p->imageDescription, &ext, kSampleDescriptionExtensionTheora, 1);
if (err != noErr) {
dbg_printf("XXX GetImageDescriptionExtension() failed! ('%4.4s')\n", &(*p->imageDescription)->cType);
err = codecBadDataErr;
return err;
}
mCookie = (UInt8 *) *ext;
mCookieSize = GetHandleSize(ext);
ptrheader = mCookie;
cend = mCookie + mCookieSize;
aheader = (CookieAtomHeader*)ptrheader;
header.bytes = header_tc.bytes = header_cb.bytes = 0;
while (ptrheader < cend) {
aheader = (CookieAtomHeader *) ptrheader;
ptrheader += EndianU32_BtoN(aheader->size);
if (ptrheader > cend || EndianU32_BtoN(aheader->size) <= 0)
break;
switch(EndianS32_BtoN(aheader->type)) {
case kCookieTypeTheoraHeader:
header.b_o_s = 1;
header.e_o_s = 0;
header.granulepos = 0;
header.packetno = 0;
header.bytes = EndianS32_BtoN(aheader->size) - 2 * sizeof(long);
header.packet = aheader->data;
break;
case kCookieTypeTheoraComments:
header_tc.b_o_s = 0;
header_tc.e_o_s = 0;
header_tc.granulepos = 0;
header_tc.packetno = 1;
header_tc.bytes = EndianS32_BtoN(aheader->size) - 2 * sizeof(long);
header_tc.packet = aheader->data;
break;
case kCookieTypeTheoraCodebooks:
header_cb.b_o_s = 0;
header_cb.e_o_s = 0;
header_cb.granulepos = 0;
header_cb.packetno = 2;
header_cb.bytes = EndianS32_BtoN(aheader->size) - 2 * sizeof(long);
header_cb.packet = aheader->data;
break;
default:
break;
}
}
err = codecBadDataErr;
if (header.bytes == 0 || header_tc.bytes == 0 || header_cb.bytes == 0)
return err;
th_info_init(&glob->ti);
th_comment_init(&tc);
glob->ts = NULL;
if (th_decode_headerin(&glob->ti, &tc, &glob->ts, &header) < 0) {
if (glob->ts != NULL)
th_setup_free (glob->ts);
th_comment_clear(&tc);
th_info_clear(&glob->ti);
return err;
}
th_decode_headerin(&glob->ti, &tc, &glob->ts, &header_tc);
th_decode_headerin(&glob->ti, &tc, &glob->ts, &header_cb);
err = noErr;
th_comment_clear(&tc);
dbg_printf("--:Theora:- OK, managed to initialize the decoder somehow...\n");
glob->info_initialised = true;
return err;
}
