cog/Plugins/CoreAudio/CoreAudioDecoder.m

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/*
* $Id$
*
* Copyright (C) 2006 Stephen F. Booth <me@sbooth.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
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#include <unistd.h>
#import "CoreAudioDecoder.h"
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#import "Logging.h"
@interface CoreAudioDecoder (Private)
- (BOOL)readInfoFromExtAudioFileRef;
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@end
static int ffat_get_channel_id(AudioChannelLabel label) {
if(label == 0)
return -1;
else if(label <= kAudioChannelLabel_LFEScreen)
return label - 1;
else if(label <= kAudioChannelLabel_RightSurround)
return label + 4;
else if(label <= kAudioChannelLabel_CenterSurround)
return label + 1;
else if(label <= kAudioChannelLabel_RightSurroundDirect)
return label + 23;
else if(label <= kAudioChannelLabel_TopBackRight)
return label - 1;
else if(label < kAudioChannelLabel_RearSurroundLeft)
return -1;
else if(label <= kAudioChannelLabel_RearSurroundRight)
return label - 29;
else if(label <= kAudioChannelLabel_RightWide)
return label - 4;
else if(label == kAudioChannelLabel_LFE2)
return -1;
else if(label == kAudioChannelLabel_Mono)
return 2; // Front center
else
return -1;
}
static OSStatus readProc(void *clientData,
SInt64 position,
UInt32 requestCount,
void *buffer,
UInt32 *actualCount) {
NSObject *_handle = (__bridge NSObject *)(clientData);
CoreAudioDecoder *__unsafe_unretained pSelf = (id)_handle;
id<CogSource> source = pSelf->_audioSource;
if(position != pSelf->_lastPosition) {
[source seek:position whence:SEEK_SET];
}
size_t copyMax = 0;
size_t bytesRead = 0;
if(requestCount)
bytesRead = [source read:(((uint8_t *)buffer) + copyMax) amount:requestCount];
pSelf->_lastPosition = position + bytesRead;
if(actualCount)
*actualCount = (UInt32)(copyMax + bytesRead);
return noErr;
}
static SInt64 getSizeProc(void *clientData) {
NSObject *_handle = (__bridge NSObject *)(clientData);
CoreAudioDecoder *__unsafe_unretained pSelf = (id)_handle;
return pSelf->_fileSize;
}
@implementation CoreAudioDecoder
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- (void)close {
OSStatus err;
if(_in_opened) {
err = ExtAudioFileDispose(_in);
if(noErr != err) {
DLog(@"Error closing ExtAudioFile");
}
_in_opened = NO;
}
if(_audioFile_opened) {
err = AudioFileClose(_audioFile);
if(noErr != err) {
DLog(@"Error closing AudioFile");
}
_audioFile_opened = NO;
}
_audioSource = nil;
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}
- (void)dealloc {
[self close];
}
- (BOOL)open:(id<CogSource>)source;
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{
OSStatus err;
_audioFile_opened = NO;
_in_opened = NO;
if(![source seekable])
return NO;
_audioSource = source;
_lastPosition = [source tell];
[source seek:0 whence:SEEK_END];
_fileSize = [source tell];
[source seek:_lastPosition whence:SEEK_SET];
err = AudioFileOpenWithCallbacks((__bridge void *)self, readProc, 0, getSizeProc, 0, 0, &_audioFile);
if(noErr != err) {
ALog(@"Error opening callback interface to file: %d", err);
return NO;
}
_audioFile_opened = YES;
err = ExtAudioFileWrapAudioFileID(_audioFile, false, &_in);
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if(noErr != err) {
ALog(@"Error opening file: %d", err);
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return NO;
}
_in_opened = YES;
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return [self readInfoFromExtAudioFileRef];
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}
- (BOOL)readInfoFromExtAudioFileRef {
OSStatus err;
UInt32 size;
UInt32 asbdSize;
AudioStreamBasicDescription asbd;
AudioFileID afi;
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// Get input file information
asbdSize = sizeof(asbd);
err = ExtAudioFileGetProperty(_in, kExtAudioFileProperty_FileDataFormat, &asbdSize, &asbd);
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if(err != noErr) {
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err = ExtAudioFileDispose(_in);
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return NO;
}
SInt64 total;
size = sizeof(total);
err = ExtAudioFileGetProperty(_in, kExtAudioFileProperty_FileLengthFrames, &size, &total);
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if(err != noErr) {
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err = ExtAudioFileDispose(_in);
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return NO;
}
totalFrames = total;
size = sizeof(afi);
err = ExtAudioFileGetProperty(_in, kExtAudioFileProperty_AudioFile, &size, &afi);
if(err != noErr) {
err = ExtAudioFileDispose(_in);
return NO;
}
SInt32 formatBitsPerSample;
size = sizeof(formatBitsPerSample);
err = AudioFileGetProperty(afi, kAudioFilePropertySourceBitDepth, &size, &formatBitsPerSample);
if(err != noErr) {
if(err == kAudioFileUnsupportedPropertyError) {
formatBitsPerSample = 0; // floating point formats apparently don't return this any more
} else {
err = ExtAudioFileDispose(_in);
return NO;
}
}
UInt32 _bitrate;
size = sizeof(_bitrate);
err = AudioFileGetProperty(afi, kAudioFilePropertyBitRate, &size, &_bitrate);
if(err != noErr) {
err = ExtAudioFileDispose(_in);
return NO;
}
err = AudioFileGetPropertyInfo(afi, kAudioFilePropertyChannelLayout, &size, NULL);
if(err != noErr || size == 0) {
err = ExtAudioFileDispose(_in);
return NO;
}
AudioChannelLayout *acl = malloc(size);
err = AudioFileGetProperty(afi, kAudioFilePropertyChannelLayout, &size, acl);
if(err != noErr) {
free(acl);
err = ExtAudioFileDispose(_in);
return NO;
}
uint32_t config = 0;
for(uint32_t i = 0; i < acl->mNumberChannelDescriptions; ++i) {
int channelNumber = ffat_get_channel_id(acl->mChannelDescriptions[i].mChannelLabel);
if(channelNumber >= 0) {
if(config & (1 << channelNumber)) {
free(acl);
err = ExtAudioFileDispose(_in);
return NO;
}
config |= 1 << channelNumber;
} else {
free(acl);
err = ExtAudioFileDispose(_in);
return NO;
}
}
channelConfig = config;
free(acl);
bitrate = (_bitrate + 500) / 1000;
CFStringRef formatName;
size = sizeof(formatName);
err = AudioFormatGetProperty(kAudioFormatProperty_FormatName, asbdSize, &asbd, &size, &formatName);
if(err != noErr) {
err = ExtAudioFileDispose(_in);
return NO;
}
codec = (__bridge NSString *)formatName;
CFRelease(formatName);
NSRange range = [codec rangeOfString:@","];
if(range.location != NSNotFound) {
codec = [codec substringToIndex:range.location];
}
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// Set our properties
bitsPerSample = formatBitsPerSample;
channels = asbd.mChannelsPerFrame;
frequency = asbd.mSampleRate;
floatingPoint = NO;
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// mBitsPerChannel will only be set for lpcm formats
if(bitsPerSample <= 0) {
bitsPerSample = 32;
floatingPoint = YES;
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}
_audioFile_is_lossy = NO;
if(floatingPoint || [[codec lowercaseString] containsString:@"adpcm"] || [[codec lowercaseString] containsString:@"gsm"])
_audioFile_is_lossy = YES;
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// Set output format
AudioStreamBasicDescription result;
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bzero(&result, sizeof(AudioStreamBasicDescription));
result.mFormatID = kAudioFormatLinearPCM;
if(floatingPoint) {
result.mFormatFlags = kAudioFormatFlagIsFloat | kAudioFormatFlagIsPacked;
} else {
result.mFormatFlags = kAudioFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsBigEndian;
}
result.mSampleRate = frequency;
result.mChannelsPerFrame = channels;
result.mBitsPerChannel = bitsPerSample;
result.mBytesPerPacket = channels * (bitsPerSample / 8);
result.mFramesPerPacket = 1;
result.mBytesPerFrame = channels * (bitsPerSample / 8);
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err = ExtAudioFileSetProperty(_in, kExtAudioFileProperty_ClientDataFormat, sizeof(result), &result);
if(noErr != err) {
err = ExtAudioFileDispose(_in);
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return NO;
}
[self willChangeValueForKey:@"properties"];
[self didChangeValueForKey:@"properties"];
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return YES;
}
- (AudioChunk *)readAudio {
OSStatus err;
AudioBufferList bufferList;
UInt32 frameCount;
int frames = 1024;
size_t bytesPerFrame = channels * (bitsPerSample / 8);
uint8_t buffer[frames * bytesPerFrame];
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// Set up the AudioBufferList
bufferList.mNumberBuffers = 1;
bufferList.mBuffers[0].mNumberChannels = channels;
bufferList.mBuffers[0].mData = buffer;
bufferList.mBuffers[0].mDataByteSize = frames * channels * (bitsPerSample / 8);
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// Read a chunk of PCM input (converted from whatever format)
frameCount = frames;
err = ExtAudioFileRead(_in, &frameCount, &bufferList);
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if(err != noErr) {
return nil;
}
id audioChunkClass = NSClassFromString(@"AudioChunk");
AudioChunk *chunk = [[audioChunkClass alloc] initWithProperties:[self properties]];
[chunk assignSamples:buffer frameCount:frameCount];
return chunk;
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}
- (long)seek:(long)frame {
OSStatus err;
err = ExtAudioFileSeek(_in, frame);
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if(noErr != err) {
return -1;
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}
return frame;
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}
+ (NSArray *)fileTypes {
OSStatus err;
UInt32 size;
NSArray *sAudioExtensions;
size = sizeof(sAudioExtensions);
err = AudioFileGetGlobalInfo(kAudioFileGlobalInfo_AllExtensions, 0, NULL, &size, &sAudioExtensions);
if(noErr != err) {
return nil;
}
return sAudioExtensions;
}
+ (NSArray *)mimeTypes {
OSStatus err;
UInt32 size;
NSArray *sAudioMIMETypes;
size = sizeof(sAudioMIMETypes);
err = AudioFileGetGlobalInfo(kAudioFileGlobalInfo_AllMIMETypes, 0, NULL, &size, &sAudioMIMETypes);
if(noErr != err) {
return nil;
}
return sAudioMIMETypes;
}
+ (float)priority {
return 1.0;
}
+ (NSArray *)fileTypeAssociations {
return @[
@[@"WAVE File", @"wav.icns", @"wav", @"w64"],
@[@"AIFF File", @"aiff.icns", @"aif", @"aiff", @"aifc"],
@[@"CAF File", @"song.icns", @"caf"],
@[@"AU File", @"song.icns", @"au"],
@[@"MPEG Audio File", @"mp3.icns", @"mp3", @"mp2", @"mp1", @"m2a", @"mpa"],
@[@"MPEG Stream File", @"song.icns", @"mpeg"],
@[@"MPEG-4 Audio File", @"m4a.icns", @"m4a", @"mp4", @"m4b", @"m4r"],
@[@"MPEG-4 AAC Audio File", @"song.icns", @"aac", @"adts"],
@[@"AMR Audio File", @"song.icns", @"amr"],
@[@"USAC Audio File", @"song.icns", @"xhe"],
@[@"AC-3 Audio File", @"song.icns", @"ac3"],
@[@"FLAC Audio File", @"flac.icns", @"flac"],
@[@"SND Audio File", @"song.icns", @"snd"]
];
}
- (NSDictionary *)properties {
return @{ @"channels": @(channels),
@"channelConfig": @(channelConfig),
@"bitsPerSample": @(bitsPerSample),
@"floatingPoint": @(floatingPoint),
@"bitrate": @(bitrate),
@"sampleRate": @(frequency),
@"totalFrames": @(totalFrames),
@"seekable": @(YES),
@"codec": codec,
@"endian": floatingPoint ? @"host" : @"big",
@"encoding": _audioFile_is_lossy ? @"lossy" : @"lossless" };
}
- (NSDictionary *)metadata {
return @{};
}
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@end