cog/Audio/Chain/ConverterNode.m

173 lines
4.5 KiB
Objective-C

//
// ConverterNode.m
// Cog
//
// Created by Zaphod Beeblebrox on 8/2/05.
// Copyright 2005 __MyCompanyName__. All rights reserved.
//
#import "ConverterNode.h"
void PrintStreamDesc (AudioStreamBasicDescription *inDesc)
{
if (!inDesc) {
printf ("Can't print a NULL desc!\n");
return;
}
printf ("- - - - - - - - - - - - - - - - - - - -\n");
printf (" Sample Rate:%f\n", inDesc->mSampleRate);
printf (" Format ID:%s\n", (char*)&inDesc->mFormatID);
printf (" Format Flags:%lX\n", inDesc->mFormatFlags);
printf (" Bytes per Packet:%ld\n", inDesc->mBytesPerPacket);
printf (" Frames per Packet:%ld\n", inDesc->mFramesPerPacket);
printf (" Bytes per Frame:%ld\n", inDesc->mBytesPerFrame);
printf (" Channels per Frame:%ld\n", inDesc->mChannelsPerFrame);
printf (" Bits per Channel:%ld\n", inDesc->mBitsPerChannel);
printf ("- - - - - - - - - - - - - - - - - - - -\n");
}
@implementation ConverterNode
//called from the complexfill when the audio is converted...good clean fun
static OSStatus ACInputProc(AudioConverterRef inAudioConverter, UInt32* ioNumberDataPackets, AudioBufferList* ioData, AudioStreamPacketDescription** outDataPacketDescription, void* inUserData)
{
ConverterNode *converter = (ConverterNode *)inUserData;
OSStatus err = noErr;
int amountToWrite;
int amountRead;
if ([converter shouldContinue] == NO || [converter endOfStream] == YES)
{
ioData->mBuffers[0].mDataByteSize = 0;
*ioNumberDataPackets = 0;
return noErr;
}
amountToWrite = (*ioNumberDataPackets)*(converter->inputFormat.mBytesPerPacket);
if (converter->callbackBuffer != NULL)
free(converter->callbackBuffer);
converter->callbackBuffer = malloc(amountToWrite);
amountRead = [converter readData:converter->callbackBuffer amount:amountToWrite];
if (amountRead == 0 && [converter endOfStream] == NO)
{
ioData->mBuffers[0].mDataByteSize = 0;
*ioNumberDataPackets = 0;
return 100; //Keep asking for data
}
ioData->mBuffers[0].mData = converter->callbackBuffer;
ioData->mBuffers[0].mDataByteSize = amountRead;
ioData->mBuffers[0].mNumberChannels = (converter->inputFormat.mChannelsPerFrame);
ioData->mNumberBuffers = 1;
return err;
}
-(void)process
{
char writeBuf[CHUNK_SIZE];
while ([self shouldContinue] == YES && [self endOfStream] == NO) //Need to watch EOS somehow....
{
int amountConverted = [self convert:writeBuf amount:CHUNK_SIZE];
[self writeData:writeBuf amount:amountConverted];
}
}
- (int)convert:(void *)dest amount:(int)amount
{
AudioBufferList ioData;
UInt32 ioNumberFrames;
OSStatus err;
ioNumberFrames = amount/outputFormat.mBytesPerFrame;
ioData.mBuffers[0].mData = dest;
ioData.mBuffers[0].mDataByteSize = amount;
ioData.mBuffers[0].mNumberChannels = outputFormat.mChannelsPerFrame;
ioData.mNumberBuffers = 1;
err = AudioConverterFillComplexBuffer(converter, ACInputProc, self, &ioNumberFrames, &ioData, NULL);
int amountRead = ioData.mBuffers[0].mDataByteSize;
if (err == kAudioConverterErr_InvalidInputSize) //It returns insz at EOS at times...so run it again to make sure all data is converted
{
NSLog(@"INSIZE: %i", amountRead);
amountRead += [self convert:dest + amountRead amount:amount - amountRead];
}
else if (err != noErr && err != 100) {
NSLog(@"Error: %i", err);
}
return amountRead;
}
- (BOOL)setupWithInputFormat:(AudioStreamBasicDescription)inf outputFormat:(AudioStreamBasicDescription)outf
{
//Make the converter
OSStatus stat = noErr;
inputFormat = inf;
outputFormat = outf;
stat = AudioConverterNew ( &inputFormat, &outputFormat, &converter);
if (stat != noErr)
{
NSLog(@"Error creating converter %i", stat);
}
if (inputFormat.mChannelsPerFrame == 1)
{
SInt32 channelMap[2] = { 0, 0 };
stat = AudioConverterSetProperty(converter,kAudioConverterChannelMap,sizeof(channelMap),channelMap);
if (stat != noErr)
{
NSLog(@"Error mapping channels %i", stat);
}
}
PrintStreamDesc(&inf);
PrintStreamDesc(&outf);
return YES;
}
- (void)dealloc
{
NSLog(@"Decoder dealloc");
[self cleanUp];
[super dealloc];
}
- (void)setOutputFormat:(AudioStreamBasicDescription)format
{
NSLog(@"SETTING OUTPUT FORMAT!");
outputFormat = format;
}
- (void)inputFormatDidChange:(AudioStreamBasicDescription)format
{
NSLog(@"FORMAT CHANGED");
[self cleanUp];
[self setupWithInputFormat:format outputFormat:outputFormat];
}
- (void)cleanUp
{
if (converter)
{
AudioConverterDispose(converter);
converter = NULL;
}
if (callbackBuffer) {
free(callbackBuffer);
callbackBuffer = NULL;
}
}
@end