388 lines
11 KiB
Objective-C
388 lines
11 KiB
Objective-C
//
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// FlacDecoder.m
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// zyVorbis
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//
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// Created by Vincent Spader on 1/25/05.
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// Copyright 2005 Vincent Spader All rights reserved.
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//
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#import "FlacDecoder.h"
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#import "Logging.h"
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@implementation FlacDecoder
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static const char *CHANNEL_MASK_TAG = "WAVEFORMATEXTENSIBLE_CHANNEL_MASK";
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static FLAC__bool flac__utils_get_channel_mask_tag(const FLAC__StreamMetadata *object, FLAC__uint32 *channel_mask) {
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int offset;
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uint32_t val;
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char *p;
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FLAC__ASSERT(object);
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FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
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if(0 > (offset = FLAC__metadata_object_vorbiscomment_find_entry_from(object, /*offset=*/0, CHANNEL_MASK_TAG)))
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return false;
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if(object->data.vorbis_comment.comments[offset].length < strlen(CHANNEL_MASK_TAG) + 4)
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return false;
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if(0 == (p = strchr((const char *)object->data.vorbis_comment.comments[offset].entry, '='))) /* should never happen, but just in case */
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return false;
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if(strncasecmp(p, "=0x", 3))
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return false;
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if(sscanf(p + 3, "%x", &val) != 1)
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return false;
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*channel_mask = val;
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return true;
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}
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FLAC__StreamDecoderReadStatus ReadCallback(const FLAC__StreamDecoder *decoder, FLAC__byte blockBuffer[], size_t *bytes, void *client_data) {
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FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
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long bytesRead = [[flacDecoder source] read:blockBuffer amount:*bytes];
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if(bytesRead < 0) {
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*bytes = 0;
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return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
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} else if(bytesRead == 0) {
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*bytes = 0;
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[flacDecoder setEndOfStream:YES];
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return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
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} else {
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*bytes = bytesRead;
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return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
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}
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}
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FLAC__StreamDecoderSeekStatus SeekCallback(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data) {
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FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
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if(![[flacDecoder source] seek:absolute_byte_offset whence:SEEK_SET])
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return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
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else
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return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
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}
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FLAC__StreamDecoderTellStatus TellCallback(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data) {
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FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
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off_t pos;
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if((pos = [[flacDecoder source] tell]) < 0)
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return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
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else {
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*absolute_byte_offset = (FLAC__uint64)pos;
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return FLAC__STREAM_DECODER_TELL_STATUS_OK;
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}
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}
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FLAC__bool EOFCallback(const FLAC__StreamDecoder *decoder, void *client_data) {
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FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
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return (FLAC__bool)[flacDecoder endOfStream];
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}
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FLAC__StreamDecoderLengthStatus LengthCallback(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data) {
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FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
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if([[flacDecoder source] seekable]) {
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long currentPos = [[flacDecoder source] tell];
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[[flacDecoder source] seek:0 whence:SEEK_END];
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*stream_length = [[flacDecoder source] tell];
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[[flacDecoder source] seek:currentPos whence:SEEK_SET];
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return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
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} else {
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*stream_length = 0;
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return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
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}
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}
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FLAC__StreamDecoderWriteStatus WriteCallback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *const sampleblockBuffer[], void *client_data) {
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FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
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uint32_t channels = frame->header.channels;
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uint32_t bitsPerSample = frame->header.bits_per_sample;
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uint32_t frequency = frame->header.sample_rate;
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if(channels != flacDecoder->channels ||
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bitsPerSample != flacDecoder->bitsPerSample ||
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frequency != flacDecoder->frequency) {
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if(channels != flacDecoder->channels) {
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flacDecoder->channelConfig = 0;
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}
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flacDecoder->channels = channels;
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flacDecoder->bitsPerSample = bitsPerSample;
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flacDecoder->frequency = frequency;
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[flacDecoder willChangeValueForKey:@"properties"];
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[flacDecoder didChangeValueForKey:@"properties"];
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}
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void *blockBuffer = [flacDecoder blockBuffer];
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int8_t *alias8;
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int16_t *alias16;
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int32_t *alias32;
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int sample, channel;
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int32_t audioSample;
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switch(frame->header.bits_per_sample) {
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case 8:
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// Interleave the audio (no need for byte swapping)
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alias8 = blockBuffer;
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for(sample = 0; sample < frame->header.blocksize; ++sample) {
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for(channel = 0; channel < frame->header.channels; ++channel) {
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*alias8++ = (int8_t)sampleblockBuffer[channel][sample];
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}
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}
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break;
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case 16:
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// Interleave the audio, converting to big endian byte order
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alias16 = blockBuffer;
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for(sample = 0; sample < frame->header.blocksize; ++sample) {
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for(channel = 0; channel < frame->header.channels; ++channel) {
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*alias16++ = (int16_t)OSSwapHostToBigInt16((int16_t)sampleblockBuffer[channel][sample]);
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}
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}
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break;
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case 24:
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// Interleave the audio (no need for byte swapping)
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alias8 = blockBuffer;
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for(sample = 0; sample < frame->header.blocksize; ++sample) {
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for(channel = 0; channel < frame->header.channels; ++channel) {
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audioSample = sampleblockBuffer[channel][sample];
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*alias8++ = (int8_t)(audioSample >> 16);
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*alias8++ = (int8_t)(audioSample >> 8);
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*alias8++ = (int8_t)audioSample;
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}
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}
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break;
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case 32:
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// Interleave the audio, converting to big endian byte order
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alias32 = blockBuffer;
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for(sample = 0; sample < frame->header.blocksize; ++sample) {
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for(channel = 0; channel < frame->header.channels; ++channel) {
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*alias32++ = OSSwapHostToBigInt32(sampleblockBuffer[channel][sample]);
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}
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}
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default:
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// Time for some nearest byte padding up to 32
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alias8 = blockBuffer;
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int sampleSize = frame->header.bits_per_sample;
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int sampleBit;
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for(sample = 0; sample < frame->header.blocksize; ++sample) {
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for(channel = 0; channel < frame->header.channels; ++channel) {
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int32_t sampleExtended = sampleblockBuffer[channel][sample];
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for(sampleBit = sampleSize - 8; sampleBit >= -8; sampleBit -= 8) {
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if(sampleBit >= 0)
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*alias8++ = (uint8_t)((sampleExtended >> sampleBit) & 0xFF);
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else
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*alias8++ = (uint8_t)((sampleExtended << -sampleBit) & 0xFF);
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}
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}
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}
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break;
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}
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[flacDecoder setBlockBufferFrames:frame->header.blocksize];
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return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
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}
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// This callback is only called for STREAMINFO blocks
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void MetadataCallback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data) {
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// Some flacs observed in the wild have multiple STREAMINFO metadata blocks,
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// of which only first one has sane values, so only use values from the first STREAMINFO
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// to determine stream format (this seems to be consistent with flac spec: http://flac.sourceforge.net/format.html)
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FlacDecoder *flacDecoder = (__bridge FlacDecoder *)client_data;
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if(!flacDecoder->hasStreamInfo) {
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flacDecoder->channels = metadata->data.stream_info.channels;
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flacDecoder->channelConfig = 0;
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flacDecoder->frequency = metadata->data.stream_info.sample_rate;
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flacDecoder->bitsPerSample = metadata->data.stream_info.bits_per_sample;
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flacDecoder->totalFrames = metadata->data.stream_info.total_samples;
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flacDecoder->hasStreamInfo = YES;
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}
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if(metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
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(void)flac__utils_get_channel_mask_tag(metadata, &flacDecoder->channelConfig);
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}
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}
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void ErrorCallback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) {
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// Do nothing?
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}
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- (BOOL)open:(id<CogSource>)s {
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[self setSource:s];
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[self setSize:0];
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if([s seekable]) {
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[s seek:0 whence:SEEK_END];
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[self setSize:[s tell]];
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[s seek:0 whence:SEEK_SET];
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}
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decoder = FLAC__stream_decoder_new();
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if(decoder == NULL)
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return NO;
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if(FLAC__stream_decoder_init_stream(decoder,
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ReadCallback,
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([source seekable] ? SeekCallback : NULL),
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([source seekable] ? TellCallback : NULL),
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([source seekable] ? LengthCallback : NULL),
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([source seekable] ? EOFCallback : NULL),
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WriteCallback,
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MetadataCallback,
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ErrorCallback,
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(__bridge void *)(self)) != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
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return NO;
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}
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FLAC__stream_decoder_process_until_end_of_metadata(decoder);
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if(hasStreamInfo) {
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[self willChangeValueForKey:@"properties"];
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[self didChangeValueForKey:@"properties"];
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}
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blockBuffer = malloc(SAMPLE_blockBuffer_SIZE);
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return YES;
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}
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- (int)readAudio:(void *)buffer frames:(UInt32)frames {
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int framesRead = 0;
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while(framesRead < frames) {
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if(blockBufferFrames == 0) {
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if(framesRead) {
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break;
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}
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if(FLAC__stream_decoder_get_state(decoder) == FLAC__STREAM_DECODER_END_OF_STREAM) {
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break;
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}
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FLAC__stream_decoder_process_single(decoder);
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}
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int bytesPerFrame = ((bitsPerSample + 7) / 8) * channels;
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int framesToRead = blockBufferFrames;
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if(blockBufferFrames > frames) {
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framesToRead = frames;
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}
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memcpy(((uint8_t *)buffer) + (framesRead * bytesPerFrame), (uint8_t *)blockBuffer, framesToRead * bytesPerFrame);
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frames -= framesToRead;
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framesRead += framesToRead;
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blockBufferFrames -= framesToRead;
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if(blockBufferFrames > 0) {
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memmove((uint8_t *)blockBuffer, ((uint8_t *)blockBuffer) + (framesToRead * bytesPerFrame), blockBufferFrames * bytesPerFrame);
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}
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}
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return framesRead;
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}
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- (void)close {
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if(decoder) {
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FLAC__stream_decoder_finish(decoder);
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FLAC__stream_decoder_delete(decoder);
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}
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if(blockBuffer) {
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free(blockBuffer);
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}
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decoder = NULL;
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blockBuffer = NULL;
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}
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- (void)dealloc {
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[self close];
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}
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- (long)seek:(long)sample {
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if(!FLAC__stream_decoder_seek_absolute(decoder, sample))
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return -1;
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return sample;
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}
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// bs methods
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- (char *)blockBuffer {
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return blockBuffer;
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}
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- (int)blockBufferFrames {
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return blockBufferFrames;
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}
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- (void)setBlockBufferFrames:(int)frames {
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blockBufferFrames = frames;
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}
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- (FLAC__StreamDecoder *)decoder {
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return decoder;
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}
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- (void)setSource:(id<CogSource>)s {
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source = s;
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}
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- (id<CogSource>)source {
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return source;
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}
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- (void)setEndOfStream:(BOOL)eos {
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endOfStream = eos;
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}
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- (BOOL)endOfStream {
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return endOfStream;
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}
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- (void)setSize:(long)size {
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fileSize = size;
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}
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- (NSDictionary *)properties {
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return @{@"channels": [NSNumber numberWithInt:channels],
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@"channelConfig": [NSNumber numberWithUnsignedInt:channelConfig],
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@"bitsPerSample": [NSNumber numberWithInt:bitsPerSample],
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@"sampleRate": [NSNumber numberWithFloat:frequency],
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@"totalFrames": [NSNumber numberWithDouble:totalFrames],
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@"seekable": [NSNumber numberWithBool:[source seekable]],
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@"bitrate": [NSNumber numberWithInt:fileSize ? (fileSize * 8 / ((totalFrames + (frequency / 2)) / frequency)) / 1000 : 0],
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@"codec": @"FLAC",
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@"endian": @"big",
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@"encoding": @"lossless"};
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}
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+ (NSArray *)fileTypes {
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return @[@"flac"];
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}
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+ (NSArray *)mimeTypes {
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return @[@"audio/x-flac"];
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}
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+ (float)priority {
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return 2.0;
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}
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+ (NSArray *)fileTypeAssociations {
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return @[
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@[@"FLAC Audio File", @"flac.icns", @"flac"]
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];
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}
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@end
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