/* the rest of these are only used for seeking: */
FLAC__StreamMetadata_StreamInfo stream_info; /* we keep this around so we can figure out how to seek quickly */
const FLAC__StreamMetadata_SeekTable *seek_table; /* we hold a pointer to the stream decoder's seek table for the same reason */
+ /* Since we always want to see the STREAMINFO and SEEK_TABLE blocks at this level, we need some extra flags to keep track of whether they should be passed on up through the metadata_callback */
+ FLAC__bool ignore_stream_info_block;
+ FLAC__bool ignore_seek_table_block;
FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */
FLAC__uint64 target_sample;
} FLAC__SeekableStreamDecoderPrivate;
FLAC__stream_decoder_set_error_callback(decoder->private_->stream_decoder, error_callback_);
FLAC__stream_decoder_set_client_data(decoder->private_->stream_decoder, decoder);
+ /* We always want to see these blocks. Whether or not we pass them up
+ * through the metadata callback will be determined by flags set in our
+ * implementation of ..._set_metadata_respond/ignore...()
+ */
+ FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_STREAMINFO);
+ FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_SEEKTABLE);
+
if(FLAC__stream_decoder_init(decoder->private_->stream_decoder) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA)
return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
FLAC__ASSERT(decoder->private_->stream_decoder != 0);
if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
return false;
+ if(type == FLAC__METADATA_TYPE_STREAMINFO)
+ decoder->private_->ignore_stream_info_block = false;
+ else if(type == FLAC__METADATA_TYPE_SEEKTABLE)
+ decoder->private_->ignore_seek_table_block = false;
return FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, type);
}
FLAC__ASSERT(decoder->private_->stream_decoder != 0);
if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
return false;
+ decoder->private_->ignore_stream_info_block = false;
+ decoder->private_->ignore_seek_table_block = false;
return FLAC__stream_decoder_set_metadata_respond_all(decoder->private_->stream_decoder);
}
FLAC__ASSERT(decoder->private_->stream_decoder != 0);
if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
return false;
+ if(type == FLAC__METADATA_TYPE_STREAMINFO)
+ decoder->private_->ignore_stream_info_block = true;
+ else if(type == FLAC__METADATA_TYPE_SEEKTABLE)
+ decoder->private_->ignore_seek_table_block = true;
return FLAC__stream_decoder_set_metadata_ignore(decoder->private_->stream_decoder, type);
}
FLAC__ASSERT(decoder->private_->stream_decoder != 0);
if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
return false;
+ decoder->private_->ignore_stream_info_block = true;
+ decoder->private_->ignore_seek_table_block = true;
return FLAC__stream_decoder_set_metadata_ignore_all(decoder->private_->stream_decoder);
}
decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
return false;
}
- if(sample > decoder->private_->stream_info.total_samples) {
+ if(decoder->private_->stream_info.total_samples > 0 && sample > decoder->private_->stream_info.total_samples) {
decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
return false;
}
decoder->private_->metadata_callback = 0;
decoder->private_->error_callback = 0;
decoder->private_->client_data = 0;
+ /* WATCHOUT: these should match the default behavior of FLAC__StreamDecoder */
+ decoder->private_->ignore_stream_info_block = false;
+ decoder->private_->ignore_seek_table_block = true;
decoder->protected_->md5_checking = false;
}
seekable_stream_decoder->private_->seek_table = &metadata->data.seek_table;
}
- if(seekable_stream_decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING)
- seekable_stream_decoder->private_->metadata_callback(seekable_stream_decoder, metadata, seekable_stream_decoder->private_->client_data);
+ if(seekable_stream_decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING) {
+ FLAC__bool ignore_block = false;
+ if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO && seekable_stream_decoder->private_->ignore_stream_info_block)
+ ignore_block = true;
+ else if(metadata->type == FLAC__METADATA_TYPE_SEEKTABLE && seekable_stream_decoder->private_->ignore_seek_table_block)
+ ignore_block = true;
+ if(!ignore_block)
+ seekable_stream_decoder->private_->metadata_callback(seekable_stream_decoder, metadata, seekable_stream_decoder->private_->client_data);
+ }
}
void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
unsigned approx_bytes_per_frame;
FLAC__uint64 last_frame_sample = 0xffffffffffffffff;
FLAC__bool needs_seek;
- const FLAC__bool is_variable_blocksize_stream = (decoder->private_->stream_info.min_blocksize != decoder->private_->stream_info.max_blocksize);
+ const FLAC__uint64 total_samples = decoder->private_->stream_info.total_samples;
+ const unsigned min_blocksize = decoder->private_->stream_info.min_blocksize;
+ const unsigned max_blocksize = decoder->private_->stream_info.max_blocksize;
+ const unsigned max_framesize = decoder->private_->stream_info.max_framesize;
+ const unsigned channels = FLAC__seekable_stream_decoder_get_channels(decoder);
+ const unsigned bps = FLAC__seekable_stream_decoder_get_bits_per_sample(decoder);
/* we are just guessing here, but we want to guess high, not low */
- if(decoder->private_->stream_info.max_framesize > 0) {
- approx_bytes_per_frame = decoder->private_->stream_info.max_framesize;
+ if(max_framesize > 0) {
+ approx_bytes_per_frame = max_framesize;
}
- else if(!is_variable_blocksize_stream) {
- /* note there are no () around 'decoder->private_->stream_info.bits_per_sample/8' to keep precision up since it's an integer calulation */
- approx_bytes_per_frame = decoder->private_->stream_info.min_blocksize * decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample/8 + 64;
+ /*
+ * Check if it's a known fixed-blocksize stream. Note that though
+ * the spec doesn't allow zeroes in the STREAMINFO block, we may
+ * never get a STREAMINFO block when decoding so the value of
+ * min_blocksize might be zero.
+ */
+ else if(min_blocksize == max_blocksize && min_blocksize > 0) {
+ /* note there are no () around 'bps/8' to keep precision up since it's an integer calulation */
+ approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64;
}
else
- approx_bytes_per_frame = 1152 * decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample/8 + 64;
+ approx_bytes_per_frame = 4608 * channels * bps/8 + 64;
/*
* The stream position is currently at the first frame plus any read
lower_bound = first_frame_offset;
/* calc the upper_bound, beyond which we never want to seek */
- if(decoder->private_->stream_info.max_framesize > 0)
- upper_bound = stream_length - (decoder->private_->stream_info.max_framesize + 128 + 2); /* 128 for a possible ID3V1 tag, 2 for indexing differences */
+ if(max_framesize > 0)
+ upper_bound = stream_length - (max_framesize + 128 + 2); /* 128 for a possible ID3V1 tag, 2 for indexing differences */
else
- upper_bound = stream_length - ((decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample * FLAC__MAX_BLOCK_SIZE) / 8 + 128 + 2);
+ upper_bound = stream_length - ((channels * bps * FLAC__MAX_BLOCK_SIZE) / 8 + 128 + 2);
/*
* Now we refine the bounds if we have a seektable with
#endif
}
}
- if(pos < 0) {
- /* We need to use the metadata and the filelength to estimate the position of the frame with the correct sample */
+
+ /*
+ * If there's no seek table, we need to use the metadata (if we
+ * have it) and the filelength to estimate the position of the
+ * frame with the correct sample.
+ */
+ if(pos < 0 && total_samples > 0) {
#if defined _MSC_VER || defined __MINGW32__
/* with VC++ you have to spoon feed it the casting */
- pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)(FLAC__int64)target_sample / (double)(FLAC__int64)decoder->private_->stream_info.total_samples * (double)(FLAC__int64)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame;
+ pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)(FLAC__int64)target_sample / (double)(FLAC__int64)total_samples * (double)(FLAC__int64)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame;
#else
- pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)target_sample / (double)decoder->private_->stream_info.total_samples * (double)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame;
+ pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)target_sample / (double)total_samples * (double)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame;
#endif
}
+ /*
+ * If there's no seek table and total_samples is unknown, we
+ * don't even bother trying to figure out a target, we just use
+ * our current position.
+ */
+ if(pos < 0) {
+ FLAC__uint64 upos;
+ if(decoder->private_->tell_callback(decoder, &upos, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) {
+ decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
+ return false;
+ }
+ pos = (FLAC__int32)upos;
+ needs_seek = false;
+ }
+ else
+ needs_seek = true;
+
/* clip the position to the bounds, lower bound takes precedence */
- if(pos >= (FLAC__int64)upper_bound)
+ if(pos >= (FLAC__int64)upper_bound) {
pos = (FLAC__int64)upper_bound-1;
- if(pos < (FLAC__int64)lower_bound)
+ needs_seek = true;
+ }
+ if(pos < (FLAC__int64)lower_bound) {
pos = (FLAC__int64)lower_bound;
- needs_seek = true;
+ needs_seek = true;
+ }
decoder->private_->target_sample = target_sample;
while(1) {
else {
if(target_sample < this_frame_sample) {
last_pos = pos;
- approx_bytes_per_frame = decoder->private_->last_frame.header.blocksize * decoder->private_->last_frame.header.channels * decoder->private_->last_frame.header.bits_per_sample/8 + 64;
+ approx_bytes_per_frame = decoder->private_->last_frame.header.blocksize * channels * bps/8 + 64;
pos -= approx_bytes_per_frame;
needs_seek = true;
}
else { /* target_sample >= this_frame_sample + this frame's blocksize */
- last_pos = pos;
- if(decoder->private_->tell_callback(decoder, (FLAC__uint64*)(&pos), decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) {
+ FLAC__uint64 upos;
+ if(decoder->private_->tell_callback(decoder, &upos, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) {
decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
return false;
}
+ last_pos = pos;
+ pos = (FLAC__int32)upos;
pos -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder);
needs_seek = false;
}