377 lines
10 KiB
Objective-C
377 lines
10 KiB
Objective-C
//
|
|
// FlacDecoder.m
|
|
// zyVorbis
|
|
//
|
|
// Created by Vincent Spader on 1/25/05.
|
|
// Copyright 2005 Vincent Spader All rights reserved.
|
|
//
|
|
|
|
#import "FlacDecoder.h"
|
|
|
|
#import "Logging.h"
|
|
|
|
@implementation FlacDecoder
|
|
|
|
FLAC__StreamDecoderReadStatus ReadCallback(const FLAC__StreamDecoder *decoder, FLAC__byte blockBuffer[], size_t *bytes, void *client_data)
|
|
{
|
|
FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
|
|
long bytesRead = [[flacDecoder source] read:blockBuffer amount:*bytes];
|
|
|
|
if(bytesRead < 0) {
|
|
*bytes = 0;
|
|
return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
|
|
}
|
|
else if(bytesRead == 0) {
|
|
*bytes = 0;
|
|
[flacDecoder setEndOfStream:YES];
|
|
return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
|
|
}
|
|
else {
|
|
*bytes = bytesRead;
|
|
return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
|
|
}
|
|
}
|
|
|
|
FLAC__StreamDecoderSeekStatus SeekCallback(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
|
|
{
|
|
FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
|
|
|
|
if(![[flacDecoder source] seek:absolute_byte_offset whence:SEEK_SET])
|
|
return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
|
|
else
|
|
return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
|
|
}
|
|
|
|
FLAC__StreamDecoderTellStatus TellCallback(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
|
|
{
|
|
FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
|
|
|
|
off_t pos;
|
|
if((pos = [[flacDecoder source] tell]) < 0)
|
|
return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
|
|
else {
|
|
*absolute_byte_offset = (FLAC__uint64)pos;
|
|
return FLAC__STREAM_DECODER_TELL_STATUS_OK;
|
|
}
|
|
}
|
|
|
|
FLAC__bool EOFCallback(const FLAC__StreamDecoder *decoder, void *client_data)
|
|
{
|
|
FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
|
|
|
|
return (FLAC__bool)[flacDecoder endOfStream];
|
|
}
|
|
|
|
FLAC__StreamDecoderLengthStatus LengthCallback(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
|
|
{
|
|
FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
|
|
|
|
if ([[flacDecoder source] seekable]) {
|
|
long currentPos = [[flacDecoder source] tell];
|
|
|
|
[[flacDecoder source] seek:0 whence:SEEK_END];
|
|
*stream_length = [[flacDecoder source] tell];
|
|
|
|
[[flacDecoder source] seek:currentPos whence:SEEK_SET];
|
|
|
|
return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
|
|
}
|
|
else {
|
|
*stream_length = 0;
|
|
return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
|
|
}
|
|
}
|
|
|
|
FLAC__StreamDecoderWriteStatus WriteCallback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const sampleblockBuffer[], void *client_data)
|
|
{
|
|
FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
|
|
|
|
void *blockBuffer = [flacDecoder blockBuffer];
|
|
|
|
int8_t *alias8;
|
|
int16_t *alias16;
|
|
int32_t *alias32;
|
|
int sample, channel;
|
|
int32_t audioSample;
|
|
|
|
switch(frame->header.bits_per_sample) {
|
|
case 8:
|
|
// Interleave the audio (no need for byte swapping)
|
|
alias8 = blockBuffer;
|
|
for(sample = 0; sample < frame->header.blocksize; ++sample) {
|
|
for(channel = 0; channel < frame->header.channels; ++channel) {
|
|
*alias8++ = (int8_t)sampleblockBuffer[channel][sample];
|
|
}
|
|
}
|
|
|
|
break;
|
|
|
|
case 16:
|
|
// Interleave the audio, converting to big endian byte order
|
|
alias16 = blockBuffer;
|
|
for(sample = 0; sample < frame->header.blocksize; ++sample) {
|
|
for(channel = 0; channel < frame->header.channels; ++channel) {
|
|
*alias16++ = (int16_t)OSSwapHostToBigInt16((int16_t)sampleblockBuffer[channel][sample]);
|
|
}
|
|
}
|
|
|
|
break;
|
|
|
|
case 24:
|
|
// Interleave the audio (no need for byte swapping)
|
|
alias8 = blockBuffer;
|
|
for(sample = 0; sample < frame->header.blocksize; ++sample) {
|
|
for(channel = 0; channel < frame->header.channels; ++channel) {
|
|
audioSample = sampleblockBuffer[channel][sample];
|
|
*alias8++ = (int8_t)(audioSample >> 16);
|
|
*alias8++ = (int8_t)(audioSample >> 8);
|
|
*alias8++ = (int8_t)audioSample;
|
|
}
|
|
}
|
|
|
|
break;
|
|
|
|
case 32:
|
|
// Interleave the audio, converting to big endian byte order
|
|
alias32 = blockBuffer;
|
|
for(sample = 0; sample < frame->header.blocksize; ++sample) {
|
|
for(channel = 0; channel < frame->header.channels; ++channel) {
|
|
*alias32++ = OSSwapHostToBigInt32(sampleblockBuffer[channel][sample]);
|
|
}
|
|
}
|
|
default:
|
|
// Time for some nearest byte padding up to 32
|
|
alias8 = blockBuffer;
|
|
int sampleSize = frame->header.bits_per_sample;
|
|
int sampleBit;
|
|
for(sample = 0; sample < frame->header.blocksize; ++sample) {
|
|
for(channel = 0; channel < frame->header.channels; ++channel) {
|
|
int32_t sampleExtended = sampleblockBuffer[channel][sample];
|
|
for(sampleBit = sampleSize - 8; sampleBit >= -8; sampleBit -= 8) {
|
|
if (sampleBit >= 0)
|
|
*alias8++ = (uint8_t)((sampleExtended >> sampleBit) & 0xFF);
|
|
else
|
|
*alias8++ = (uint8_t)((sampleExtended << -sampleBit) & 0xFF);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
[flacDecoder setBlockBufferFrames:frame->header.blocksize];
|
|
|
|
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
|
|
}
|
|
|
|
// This callback is only called for STREAMINFO blocks
|
|
void MetadataCallback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
|
|
{
|
|
// Some flacs observed in the wild have multiple STREAMINFO metadata blocks,
|
|
// of which only first one has sane values, so only use values from the first STREAMINFO
|
|
// to determine stream format (this seems to be consistent with flac spec: http://flac.sourceforge.net/format.html)
|
|
FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
|
|
|
|
if (!flacDecoder->hasStreamInfo) {
|
|
flacDecoder->channels = metadata->data.stream_info.channels;
|
|
flacDecoder->frequency = metadata->data.stream_info.sample_rate;
|
|
flacDecoder->bitsPerSample = metadata->data.stream_info.bits_per_sample;
|
|
|
|
flacDecoder->totalFrames = metadata->data.stream_info.total_samples;
|
|
|
|
[flacDecoder willChangeValueForKey:@"properties"];
|
|
[flacDecoder didChangeValueForKey:@"properties"];
|
|
|
|
flacDecoder->hasStreamInfo = YES;
|
|
}
|
|
}
|
|
|
|
void ErrorCallback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
|
|
{
|
|
//Do nothing?
|
|
}
|
|
|
|
- (BOOL)open:(id<CogSource>)s
|
|
{
|
|
[self setSource:s];
|
|
[self setSize:0];
|
|
|
|
if ([s seekable])
|
|
{
|
|
[s seek:0 whence:SEEK_END];
|
|
[self setSize:[s tell]];
|
|
[s seek:0 whence:SEEK_SET];
|
|
}
|
|
|
|
decoder = FLAC__stream_decoder_new();
|
|
if (decoder == NULL)
|
|
return NO;
|
|
|
|
if (FLAC__stream_decoder_init_stream(decoder,
|
|
ReadCallback,
|
|
([source seekable] ? SeekCallback : NULL),
|
|
([source seekable] ? TellCallback : NULL),
|
|
([source seekable] ? LengthCallback : NULL),
|
|
([source seekable] ? EOFCallback : NULL),
|
|
WriteCallback,
|
|
MetadataCallback,
|
|
ErrorCallback,
|
|
(__bridge void *)(self)
|
|
) != FLAC__STREAM_DECODER_INIT_STATUS_OK)
|
|
{
|
|
return NO;
|
|
}
|
|
|
|
FLAC__stream_decoder_process_until_end_of_metadata(decoder);
|
|
|
|
blockBuffer = malloc(SAMPLE_blockBuffer_SIZE);
|
|
|
|
return YES;
|
|
}
|
|
|
|
- (int)readAudio:(void *)buffer frames:(UInt32)frames
|
|
{
|
|
int framesRead = 0;
|
|
int bytesPerFrame = ((bitsPerSample+7)/8) * channels;
|
|
while (framesRead < frames)
|
|
{
|
|
if (blockBufferFrames == 0)
|
|
{
|
|
if (FLAC__stream_decoder_get_state (decoder) == FLAC__STREAM_DECODER_END_OF_STREAM)
|
|
{
|
|
break;
|
|
}
|
|
|
|
FLAC__stream_decoder_process_single(decoder);
|
|
}
|
|
|
|
int framesToRead = blockBufferFrames;
|
|
if (blockBufferFrames > frames)
|
|
{
|
|
framesToRead = frames;
|
|
}
|
|
|
|
memcpy(((uint8_t *)buffer) + (framesRead * bytesPerFrame), (uint8_t *)blockBuffer, framesToRead * bytesPerFrame);
|
|
|
|
frames -= framesToRead;
|
|
framesRead += framesToRead;
|
|
blockBufferFrames -= framesToRead;
|
|
|
|
if (blockBufferFrames > 0)
|
|
{
|
|
memmove((uint8_t *)blockBuffer, ((uint8_t *)blockBuffer) + (framesToRead * bytesPerFrame), blockBufferFrames * bytesPerFrame);
|
|
}
|
|
}
|
|
|
|
return framesRead;
|
|
}
|
|
|
|
- (void)close
|
|
{
|
|
if (decoder)
|
|
{
|
|
FLAC__stream_decoder_finish(decoder);
|
|
FLAC__stream_decoder_delete(decoder);
|
|
}
|
|
if (blockBuffer)
|
|
{
|
|
free(blockBuffer);
|
|
}
|
|
|
|
decoder = NULL;
|
|
blockBuffer = NULL;
|
|
}
|
|
|
|
- (void)dealloc
|
|
{
|
|
[self close];
|
|
}
|
|
|
|
- (long)seek:(long)sample
|
|
{
|
|
if (!FLAC__stream_decoder_seek_absolute(decoder, sample))
|
|
return -1;
|
|
|
|
return sample;
|
|
}
|
|
|
|
//bs methods
|
|
- (char *)blockBuffer
|
|
{
|
|
return blockBuffer;
|
|
}
|
|
- (int)blockBufferFrames
|
|
{
|
|
return blockBufferFrames;
|
|
}
|
|
- (void)setBlockBufferFrames:(int)frames
|
|
{
|
|
blockBufferFrames = frames;
|
|
}
|
|
|
|
- (FLAC__StreamDecoder *)decoder
|
|
{
|
|
return decoder;
|
|
}
|
|
|
|
- (void)setSource:(id<CogSource>)s
|
|
{
|
|
source = s;
|
|
}
|
|
- (id<CogSource>)source
|
|
{
|
|
return source;
|
|
}
|
|
|
|
- (void)setEndOfStream:(BOOL)eos
|
|
{
|
|
endOfStream = eos;
|
|
}
|
|
|
|
- (BOOL)endOfStream
|
|
{
|
|
return endOfStream;
|
|
}
|
|
|
|
- (void)setSize:(long)size
|
|
{
|
|
fileSize = size;
|
|
}
|
|
|
|
- (NSDictionary *)properties
|
|
{
|
|
return [NSDictionary dictionaryWithObjectsAndKeys:
|
|
[NSNumber numberWithInt:channels],@"channels",
|
|
[NSNumber numberWithInt:bitsPerSample],@"bitsPerSample",
|
|
[NSNumber numberWithFloat:frequency],@"sampleRate",
|
|
[NSNumber numberWithDouble:totalFrames],@"totalFrames",
|
|
[NSNumber numberWithBool:[source seekable]], @"seekable",
|
|
[NSNumber numberWithInt:fileSize ? (fileSize * 8 / ((totalFrames + (frequency / 2)) / frequency)) / 1000 : 0], @"bitrate",
|
|
@"FLAC",@"codec",
|
|
@"big",@"endian",
|
|
nil];
|
|
}
|
|
|
|
+ (NSArray *)fileTypes
|
|
{
|
|
return @[@"flac"];
|
|
}
|
|
|
|
+ (NSArray *)mimeTypes
|
|
{
|
|
return @[@"audio/x-flac"];
|
|
}
|
|
|
|
+ (float)priority
|
|
{
|
|
return 2.0;
|
|
}
|
|
|
|
+ (NSArray *)fileTypeAssociations
|
|
{
|
|
return @[
|
|
@[@"FLAC Audio File", @"flac.icns", @"flac"]
|
|
];
|
|
}
|
|
|
|
@end
|