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/*=============================================================================
	AFToolsCommon.cpp
	
=============================================================================*/

#include "AFToolsCommon.h"
#include "CAAudioFileFormats.h"
#include <ctype.h>
#include <CarbonCore/Endian.h>


/*
struct AudioStreamBasicDescription
{
	Float64	mSampleRate;		//	the native sample rate of the audio stream
	UInt32	mFormatID;			//	the specific encoding type of audio stream
	UInt32	mFormatFlags;		//	flags specific to each format
	UInt32	mBytesPerPacket;	//	the number of bytes in a packet
	UInt32	mFramesPerPacket;	//	the number of frames in each packet
	UInt32	mBytesPerFrame;		//	the number of bytes in a frame
	UInt32	mChannelsPerFrame;	//	the number of channels in each frame
	UInt32	mBitsPerChannel;	//	the number of bits in each channel
	UInt32	mReserved;			//	reserved, pads the structure out to force 8 byte alignment
};
*/
bool ParseStreamDescription(const char *inTextDesc, CAStreamBasicDescription &fmt)
{
	const char *p = inTextDesc;
	int bitdepth = 0;
	CAAudioFileFormats *theFileFormats = CAAudioFileFormats::Instance();
	
	memset(&fmt, 0, sizeof(fmt));
	OSType formatID;
	int x;
	if (strchr("-@/#", p[3])) {
		// special-case for 3-char format ID's ending with a space
		char fmtstr[4];
		memcpy(fmtstr, p, 3);
		fmtstr[3] = ' ';
		formatID = EndianU32_BtoN(*(UInt32 *)fmtstr);
		x = 3;
	} else {
		x = StrToOSType(p, formatID);
	}
	if (theFileFormats->IsKnownDataFormat(formatID)) {
		p += x;
		fmt.mFormatID = formatID;
		if (*p == '-') {
			++p;
			bitdepth = 0;
			while (isdigit(*p))
				bitdepth = 10 * bitdepth + *p++ - '0';
			fmt.mBitsPerChannel = bitdepth;
		}
	}
	
	if (fmt.mFormatID == 0) {
		// unknown format, assume LPCM
		if (p[0] == '-')	// previously we required a leading dash on PCM formats
			// pcm
			++p;
		fmt.mFormatID = kAudioFormatLinearPCM;
		fmt.mFormatFlags = kAudioFormatFlagIsPacked;
		fmt.mFramesPerPacket = 1;
		fmt.mChannelsPerFrame = 1;
		bool isUnsigned = false;
	
		if (p[0] == 'B' && p[1] == 'E') {
			fmt.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
			p += 2;
		} else if (p[0] == 'L' && p[1] == 'E') {
			p += 2;
		} else {
			// default is native-endian
#if TARGET_RT_BIG_ENDIAN
			fmt.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
#endif
		}
		if (p[0] == 'F') {
			fmt.mFormatFlags |= kAudioFormatFlagIsFloat;
			++p;
		} else {
			if (p[0] == 'U') {
				isUnsigned = true;
				++p;
			}
			if (p[0] == 'I')
				++p;
			else {
				fprintf(stderr, "The format '%s' is unknown or an unparseable PCM format specifier\n", inTextDesc);
				goto Bail;
			}
		}
		
		while (isdigit(*p))
			bitdepth = 10 * bitdepth + *p++ - '0';
		if (fmt.mFormatFlags & kAudioFormatFlagIsFloat) {
			if (bitdepth != 32 && bitdepth != 64) {
				fprintf(stderr, "Valid float bitdepths are 32 and 64\n");
				goto Bail;
			}
		} else {
			if (bitdepth != 8 && bitdepth != 16 && bitdepth != 24 && bitdepth != 32) {
				fprintf(stderr, "Valid integer bitdepths are 8, 16, 24, and 32\n");
				goto Bail;
			}
			if (!isUnsigned)
				fmt.mFormatFlags |= kAudioFormatFlagIsSignedInteger;
		}
		fmt.mBitsPerChannel = bitdepth;
		fmt.mBytesPerPacket = fmt.mBytesPerFrame = bitdepth / 8;
	}
	if (*p == '@') {
		++p;
		while (isdigit(*p))
			fmt.mSampleRate = 10 * fmt.mSampleRate + (*p++ - '0');
	}
	if (*p == '/') {
		UInt32 flags = 0;
		while (true) {
			char c = *++p;
			if (c >= '0' && c <= '9')
				flags = (flags << 4) | (c - '0');
			else if (c >= 'A' && c <= 'F')
				flags = (flags << 4) | (c - 'A' + 10);
			else if (c >= 'a' && c <= 'f')
				flags = (flags << 4) | (c - 'a' + 10);
			else break;
		}
		fmt.mFormatFlags = flags;
	}
	if (*p == '#') {
		++p;
		while (isdigit(*p))
			fmt.mFramesPerPacket = 10 * fmt.mFramesPerPacket + (*p++ - '0');
	}
	if (*p != '\0')
		goto Bail;
	return true;

Bail:
	fprintf(stderr, "Invalid format string: %s\n", inTextDesc);
	fprintf(stderr, "Syntax of format strings is: [-][BE|LE]{F|I|UI}{8|16|24|32|64}[@sample_rate_hz][/format_flags]\n");
	return false;
}

void	PrintAudioFileTypesAndFormats(FILE *outfile)
{
	CAAudioFileFormats *theFileFormats = CAAudioFileFormats::Instance();

	for (int i = 0; i < theFileFormats->mNumFileFormats; ++i) {
		CAAudioFileFormats::FileFormatInfo *ffi = &theFileFormats->mFileFormats[i];
		
		int j;
		char buf[20];
		char fmtName[256] = { 0 };
		if (ffi->mFileTypeName)
			CFStringGetCString(ffi->mFileTypeName, fmtName, sizeof(fmtName), kCFStringEncodingUTF8);
		fprintf(outfile, "        '%s' = %s", OSTypeToStr(buf, sizeof(buf), ffi->mFileTypeID), fmtName);
		
		int next = ffi->NumberOfExtensions();
		if (next > 0) {
			fprintf(outfile, " (");
			for (j = 0; j < next; ++j) {
				if (j > 0) fprintf(outfile, ", ");
				fprintf(outfile, ".%s", ffi->GetExtension(j, buf, sizeof(buf)));
			}
			fprintf(outfile, ")");
		}
		
		fprintf(outfile, "\n                   data_formats: ");
		int count = 0;
		for (j = 0; j < ffi->mNumDataFormats; ++j) {
			CAAudioFileFormats::DataFormatInfo *dfi = &ffi->mDataFormats[j];
			if (dfi->mFormatID == kAudioFormatLinearPCM) {
				for (int k = 0; k < dfi->mNumVariants; ++k) {
					if (++count == 6) {
						fprintf(outfile, "\n                                 ");
						count = 0;
					}
					AudioStreamBasicDescription *asbd = &dfi->mVariants[k];
					if (asbd->mFormatFlags & ~(kAudioFormatFlagIsPacked | kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsBigEndian | kAudioFormatFlagIsFloat))
						fprintf(outfile, "(%08lx/%ld) ", asbd->mFormatFlags, asbd->mBitsPerChannel);
					else {
						fprintf(outfile, "%s",
							(asbd->mFormatFlags & kAudioFormatFlagIsBigEndian) ? "BE" : "LE");
						if (asbd->mFormatFlags & kAudioFormatFlagIsFloat)
							fprintf(outfile, "F");
						else
							fprintf(outfile, "%sI",
								(asbd->mFormatFlags & kAudioFormatFlagIsSignedInteger) ? "" : "U");
						fprintf(outfile, "%ld ", asbd->mBitsPerChannel);
					}
				}
			} else {
				if (++count == 6) {
					fprintf(outfile, "\n                                 ");
					count = 0;
				}
				fprintf(outfile, "'%s' ", OSTypeToStr(buf, sizeof(buf), dfi->mFormatID));
			}
		}
		fprintf(outfile, "\n");
	}
}

#if 0
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')
				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;
}
#endif