/*	Copyright: 	© Copyright 2005 Apple Computer, Inc. All rights reserved.

	Disclaimer:	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 AppleÕs
			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.
*/
/*=============================================================================
	CAAudioFileFormats.cpp
	
=============================================================================*/

#include "CAAudioFileFormats.h"
#include <algorithm>
#include <ctype.h>

CAAudioFileFormats *CAAudioFileFormats::sInstance = NULL;

CAAudioFileFormats *CAAudioFileFormats::Instance()
{
	if (sInstance == NULL)
		sInstance = new CAAudioFileFormats;
	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() : 
	mNumFileFormats(0), mFileFormats(NULL)
{
	OSStatus err;
	UInt32 size;
	UInt32 *fileTypes = NULL, *writableFormats = NULL, *readableFormats = NULL;
	int nWritableFormats, nReadableFormats;
	
	// 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 all writable formats
	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;
	
	// 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 (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;

		err = AudioFileGetGlobalInfoSize(kAudioFileGlobalInfo_AvailableFormatIDs, 
				sizeof(UInt32), &filetype, &size);
		if (err == noErr) {
			ffi->mNumDataFormats = size / sizeof(OSType);
			OSType *formatIDs = new OSType[ffi->mNumDataFormats];
			err = AudioFileGetGlobalInfo(kAudioFileGlobalInfo_AvailableFormatIDs,
				sizeof(UInt32), &filetype, &size, formatIDs);
			if (err == noErr) {
				ffi->mDataFormats = new DataFormatInfo[ffi->mNumDataFormats];
				for (int j = 0; j < ffi->mNumDataFormats; ++j) {
					int k;
					bool anyBigEndian = false, anyLittleEndian = false;
					DataFormatInfo *dfi = &ffi->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 = { filetype, 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;
		}
	}

	// sort file formats by name
	qsort(mFileFormats, mNumFileFormats, sizeof(FileFormatInfo), CompareFileFormatNames);
bail:
	delete[] fileTypes;
	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];
		if (ffi->mFileTypeID == filetype && ffi->mNumDataFormats == 1) {
			DataFormatInfo *dfi = &ffi->mDataFormats[0];
			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];
		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];
		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()
{
	DataFormatInfo *dfi = mDataFormats, *dfiend = dfi + mNumDataFormats;
	for ( ; dfi < dfiend; ++dfi)
		if (dfi->mWritable)
			return true;
	return false;
}

char *OSTypeToStr(char *buf, OSType t)
{
	char *p = buf;
	char str[4], *q = str;
	*(UInt32 *)str = EndianU32_NtoB(t);
	for (int i = 0; i < 4; ++i) {
		if (isprint(*q) && *q != '\\')
			*p++ = *q++;
		else {
			sprintf(p, "\\x%02x", *q++);
			p += 4;
		}
	}
	*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 = EndianU32_BtoN(*(UInt32 *)buf);
	return 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, mFileTypeID), ftypename);
	int i, n = NumberOfExtensions();
	for (i = 0; i < n; ++i) {
		GetExtension(i, ftype, sizeof(ftype));
		printf(" .%s", ftype);
	}
	printf("\n  Formats:\n");
	for (i = 0; i < mNumDataFormats; ++i)
		mDataFormats[i].DebugPrint();
}

void	CAAudioFileFormats::DataFormatInfo::DebugPrint()
{
	char buf[20];
	static char *ny[] = { "not ", "" };
	printf("    '%s': %sreadable %swritable\n", OSTypeToStr(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