/*
     File: CAAudioFileFormats.cpp
 Abstract: CAAudioFileFormats.h
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*/
#include "CAAudioFileFormats.h"
#include <algorithm>
#include <ctype.h>

CAAudioFileFormats *CAAudioFileFormats::sInstance = NULL;

CAAudioFileFormats *CAAudioFileFormats::Instance(bool loadDataFormats)
{
	if (sInstance == NULL)
		sInstance = new CAAudioFileFormats(loadDataFormats);
	return sInstance;
}

/*
class CompareFileFormatNames {
public:
	bool	operator() (const CAAudioFileFormats::FileFormatInfo &a, const CAAudioFileFormats::FileFormatInfo &b)
	{
		return CFStringCompare(a.mFileTypeName, b.mFileTypeName, 
			kCFCompareCaseInsensitive | kCFCompareLocalized) == kCFCompareLessThan;
	}
};*/

static int CompareFileFormatNames(const void *va, const void *vb)
{
	CAAudioFileFormats::FileFormatInfo  *a = (CAAudioFileFormats::FileFormatInfo *)va, 
										*b = (CAAudioFileFormats::FileFormatInfo *)vb;
	return CFStringCompare(a->mFileTypeName, b->mFileTypeName, 
		kCFCompareCaseInsensitive | kCFCompareLocalized);
}

CAAudioFileFormats::CAAudioFileFormats(bool loadDataFormats) : 
	mNumFileFormats(0), mFileFormats(NULL)
{
	OSStatus err;
	UInt32 size;
	UInt32 *fileTypes = NULL;
	
	// get all file types
	err = AudioFileGetGlobalInfoSize(kAudioFileGlobalInfo_WritableTypes, 0, NULL, &size);
	if (err != noErr) goto bail;
	mNumFileFormats = size / sizeof(UInt32);
	mFileFormats = new FileFormatInfo[mNumFileFormats];
	fileTypes = new UInt32[mNumFileFormats];
	err = AudioFileGetGlobalInfo(kAudioFileGlobalInfo_WritableTypes, 0, NULL, &size, fileTypes);
	if (err != noErr) goto bail;
	
	// get info for each file type
	for (int i = 0; i < mNumFileFormats; ++i) {
		FileFormatInfo *ffi = &mFileFormats[i];
		OSType filetype = fileTypes[i];

		ffi->mFileTypeID = filetype;
		
		// file type name
		ffi->mFileTypeName = NULL;
		size = sizeof(CFStringRef);
		err = AudioFileGetGlobalInfo(kAudioFileGlobalInfo_FileTypeName, sizeof(UInt32), &filetype, &size, &ffi->mFileTypeName);
		if (err == noErr && ffi->mFileTypeName)
			CFRetain(ffi->mFileTypeName);
		
		// file extensions
		size = sizeof(CFArrayRef);
		err = AudioFileGetGlobalInfo(kAudioFileGlobalInfo_ExtensionsForType,
			sizeof(OSType), &filetype, &size, &ffi->mExtensions);
		if (err)
			ffi->mExtensions = NULL;
		
		// file data formats
		ffi->mNumDataFormats = 0;
		ffi->mDataFormats = NULL;
		
		if (loadDataFormats)
			ffi->LoadDataFormats();
	}

	// sort file formats by name
	qsort(mFileFormats, mNumFileFormats, sizeof(FileFormatInfo), CompareFileFormatNames);
bail:
	delete[] fileTypes;
}

void	CAAudioFileFormats::FileFormatInfo::LoadDataFormats()
{
	if (mDataFormats != NULL) return;
	
	UInt32 *writableFormats = NULL, *readableFormats = NULL;
	int nWritableFormats, nReadableFormats;
	// get all writable formats
	UInt32 size;
	OSStatus err = AudioFormatGetPropertyInfo(kAudioFormatProperty_EncodeFormatIDs, 0, NULL, &size);
	if (err != noErr) goto bail;
	nWritableFormats = size / sizeof(UInt32);
	writableFormats = new UInt32[nWritableFormats];
	err = AudioFormatGetProperty(kAudioFormatProperty_EncodeFormatIDs, 0, NULL, &size, writableFormats);
	if (err != noErr) goto bail;
	
	// get all readable formats
	err = AudioFormatGetPropertyInfo(kAudioFormatProperty_DecodeFormatIDs, 0, NULL, &size);
	if (err != noErr) goto bail;
	nReadableFormats = size / sizeof(UInt32);
	readableFormats = new UInt32[nReadableFormats];
	err = AudioFormatGetProperty(kAudioFormatProperty_DecodeFormatIDs, 0, NULL, &size, readableFormats);
	if (err != noErr) goto bail;
	
	err = AudioFileGetGlobalInfoSize(kAudioFileGlobalInfo_AvailableFormatIDs, sizeof(UInt32), &mFileTypeID, &size);
	if (err == noErr) {
		mNumDataFormats = size / sizeof(OSType);
		OSType *formatIDs = new OSType[mNumDataFormats];
		err = AudioFileGetGlobalInfo(kAudioFileGlobalInfo_AvailableFormatIDs,
			sizeof(UInt32), &mFileTypeID, &size, formatIDs);
		if (err == noErr) {
			mDataFormats = new DataFormatInfo[mNumDataFormats];
			for (int j = 0; j < mNumDataFormats; ++j) {
				int k;
				bool anyBigEndian = false, anyLittleEndian = false;
				DataFormatInfo *dfi = &mDataFormats[j];
				dfi->mFormatID = formatIDs[j];
				dfi->mReadable = (dfi->mFormatID == kAudioFormatLinearPCM);
				dfi->mWritable = (dfi->mFormatID == kAudioFormatLinearPCM);
				for (k = 0; k < nReadableFormats; ++k)
					if (readableFormats[k] == dfi->mFormatID) {
						dfi->mReadable = true;
						break;
					}
				for (k = 0; k < nWritableFormats; ++k)
					if (writableFormats[k] == dfi->mFormatID) {
						dfi->mWritable = true;
						break;
					}
				
				dfi->mNumVariants = 0;
				AudioFileTypeAndFormatID tf = { mFileTypeID, dfi->mFormatID };
				err = AudioFileGetGlobalInfoSize(kAudioFileGlobalInfo_AvailableStreamDescriptionsForFormat,
					sizeof(AudioFileTypeAndFormatID), &tf, &size);
				if (err == noErr) {
					dfi->mNumVariants = size / sizeof(AudioStreamBasicDescription);
					dfi->mVariants = new AudioStreamBasicDescription[dfi->mNumVariants];
					err = AudioFileGetGlobalInfo(kAudioFileGlobalInfo_AvailableStreamDescriptionsForFormat,
						sizeof(AudioFileTypeAndFormatID), &tf, &size, dfi->mVariants);
					if (err) {
						dfi->mNumVariants = 0;
						delete[] dfi->mVariants;
						dfi->mVariants = NULL;
					} else {
						for (k = 0; k < dfi->mNumVariants; ++k) {
							AudioStreamBasicDescription *desc = &dfi->mVariants[k];
							if (desc->mBitsPerChannel > 8) {
								if (desc->mFormatFlags & kAudioFormatFlagIsBigEndian)
									anyBigEndian = true;
								else
									anyLittleEndian = true;
							}
						}
					}
				}
				
				dfi->mEitherEndianPCM = (anyBigEndian && anyLittleEndian);
			}
		}
		delete[] formatIDs;
	}
bail:
	delete[] readableFormats;
	delete[] writableFormats;
}

// note that the outgoing format will have zero for the sample rate, channels per frame, bytesPerPacket, bytesPerFrame
bool	CAAudioFileFormats::InferDataFormatFromFileFormat(AudioFileTypeID filetype, CAStreamBasicDescription &fmt)
{
	// if the file format only supports one data format
	for (int i = 0; i < mNumFileFormats; ++i) {
		FileFormatInfo *ffi = &mFileFormats[i];
		ffi->LoadDataFormats();
		if (ffi->mFileTypeID == filetype && ffi->mNumDataFormats > 0) {
			DataFormatInfo *dfi = &ffi->mDataFormats[0];
			if (ffi->mNumDataFormats > 1) {
				// file can contain multiple data formats. Take PCM if it's there.
				for (int j = 0; j < ffi->mNumDataFormats; ++j) {
					if (ffi->mDataFormats[j].mFormatID == kAudioFormatLinearPCM) {
						dfi = &ffi->mDataFormats[j];
						break;
					}
				}
			}
			memset(&fmt, 0, sizeof(fmt));
			fmt.mFormatID = dfi->mFormatID;
			if (dfi->mNumVariants > 0) {
				// take the first variant as a default
				fmt = dfi->mVariants[0];
				if (dfi->mNumVariants > 1 && dfi->mFormatID == kAudioFormatLinearPCM) {
					// look for a 16-bit variant as a better default
					for (int j = 0; j < dfi->mNumVariants; ++j) {
						AudioStreamBasicDescription *desc = &dfi->mVariants[j];
						if (desc->mBitsPerChannel == 16) {
							fmt = *desc;
							break;
						}
					}
				}
			}
			return true;
		}
	}
	return false;
}

bool	CAAudioFileFormats::InferFileFormatFromFilename(CFStringRef filename, AudioFileTypeID &filetype)
{
	bool result = false;
	CFRange range = CFStringFind(filename, CFSTR("."), kCFCompareBackwards);
	if (range.location == kCFNotFound) return false;
	range.location += 1;
	range.length = CFStringGetLength(filename) - range.location;
	CFStringRef ext = CFStringCreateWithSubstring(NULL, filename, range);
	for (int i = 0; i < mNumFileFormats; ++i) {
		FileFormatInfo *ffi = &mFileFormats[i];
		if (ffi->MatchExtension(ext)) {
			filetype = ffi->mFileTypeID;
			result = true;
			break;
		}
	}
	CFRelease(ext);
	return result;
}

bool	CAAudioFileFormats::InferFileFormatFromFilename(const char *filename, AudioFileTypeID &filetype)
{
	if (filename == NULL) return false;
	CFStringRef cfname = CFStringCreateWithCString(NULL, filename, kCFStringEncodingUTF8);
	bool result = InferFileFormatFromFilename(cfname, filetype);
	CFRelease(cfname);
	return result;
}

bool	CAAudioFileFormats::InferFileFormatFromDataFormat(const CAStreamBasicDescription &fmt, 
			AudioFileTypeID &filetype)
{
	// if there's exactly one file format that supports this data format
	FileFormatInfo *theFileFormat = NULL;
	for (int i = 0; i < mNumFileFormats; ++i) {
		FileFormatInfo *ffi = &mFileFormats[i];
		ffi->LoadDataFormats();
		DataFormatInfo *dfi = ffi->mDataFormats, *dfiend = dfi + ffi->mNumDataFormats;
		for ( ; dfi < dfiend; ++dfi)
			if (dfi->mFormatID == fmt.mFormatID) {
				if (theFileFormat != NULL)
					return false;	// ambiguous
				theFileFormat = ffi;	// got a candidate
			}
	}
	if (theFileFormat == NULL)
		return false;
	filetype = theFileFormat->mFileTypeID;
	return true;
}

bool	CAAudioFileFormats::IsKnownDataFormat(OSType dataFormat)
{
	for (int i = 0; i < mNumFileFormats; ++i) {
		FileFormatInfo *ffi = &mFileFormats[i];
		ffi->LoadDataFormats();
		DataFormatInfo *dfi = ffi->mDataFormats, *dfiend = dfi + ffi->mNumDataFormats;
		for ( ; dfi < dfiend; ++dfi)
			if (dfi->mFormatID == dataFormat)
				return true;
	}
	return false;
}

CAAudioFileFormats::FileFormatInfo *	CAAudioFileFormats::FindFileFormat(UInt32 formatID)
{
	for (int i = 0; i < mNumFileFormats; ++i) {
		FileFormatInfo *ffi = &mFileFormats[i];
		if (ffi->mFileTypeID == formatID)
			return ffi;
	}
	return NULL;
}

bool	CAAudioFileFormats::FileFormatInfo::AnyWritableFormats()
{
	LoadDataFormats();
	DataFormatInfo *dfi = mDataFormats, *dfiend = dfi + mNumDataFormats;
	for ( ; dfi < dfiend; ++dfi)
		if (dfi->mWritable)
			return true;
	return false;
}

char *OSTypeToStr(char *buf, size_t bufsize, OSType t)
{
	if (bufsize > 0) {
		char *p = buf, *pend = buf + bufsize;
		char str[4] = {0}, *q = str;
		*(UInt32 *)str = CFSwapInt32HostToBig(t);
		for (int i = 0; i < 4 && p < pend; ++i) {
			if (isprint(*q) && *q != '\\')
				*p++ = *q++;
			else {
				snprintf(p, pend - p, "\\x%02x", *q++);
				p += 4;
			}
		}
		if (p >= pend) p = pend - 1;
		*p = '\0';
	}
	return buf;
}

int		StrToOSType(const char *str, OSType &t)
{
	char buf[4];
	const char *p = str;
	int x;
	for (int i = 0; i < 4; ++i) {
		if (*p != '\\') {
			if ((buf[i] = *p++) == '\0') {
				// special-case for 'aac ': if we only got three characters, assume the last was a space
				if (i == 3) {
					--p;
					buf[i] = ' ';
					break;
				}
				goto fail;
			}
		} else {
			if (*++p != 'x') goto fail;
			if (sscanf(++p, "%02X", &x) != 1) goto fail;
			buf[i] = x;
			p += 2;
		}
	}
	t = CFSwapInt32BigToHost(*(UInt32 *)buf);
	return static_cast<int>(p - str);
fail:
	return 0;
}

#if DEBUG

void	CAAudioFileFormats::DebugPrint()
{
	for (int i = 0; i < mNumFileFormats; ++i)
		mFileFormats[i].DebugPrint();
}

void	CAAudioFileFormats::FileFormatInfo::DebugPrint()
{
	char ftype[20];
	char ftypename[64];
	CFStringGetCString(mFileTypeName, ftypename, sizeof(ftypename), kCFStringEncodingUTF8);
	printf("File type: '%s' = %s\n  Extensions:", OSTypeToStr(ftype, sizeof(ftype), mFileTypeID), ftypename);
	int i, n = NumberOfExtensions();
	for (i = 0; i < n; ++i) {
		GetExtension(i, ftype, sizeof(ftype));
		printf(" .%s", ftype);
	}
	LoadDataFormats();
	printf("\n  Formats:\n");
	for (i = 0; i < mNumDataFormats; ++i)
		mDataFormats[i].DebugPrint();
}

void	CAAudioFileFormats::DataFormatInfo::DebugPrint()
{
	char buf[20];
	static const char *ny[] = { "not ", "" };
	printf("    '%s': %sreadable %swritable\n", OSTypeToStr(buf, sizeof(buf), mFormatID), ny[mReadable], ny[mWritable]);
	for (int i = 0; i < mNumVariants; ++i) {
		CAStreamBasicDescription desc(mVariants[i]);
		desc.PrintFormat(stdout, "      ", "");
		//printf("        %d bytes/frame\n", desc.mBytesPerFrame);
	}
}
#endif