stream_decoder.c

else {
	/* Bad frame, emit error and zero the output signal */
	send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH);
	if(do_full_decode) {
		for(channel = 0; channel < decoder->private_->frame.header.channels; channel++)
			memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
		}
	}

}

even after there is a CRC16 error it continues to use the block anyway!
it needs to put the decoder back into a suitable mode!

else {
	/* Bad frame, emit error and zero the output signal */
	send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH);
	if(do_full_decode) {
		for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
			memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
		}
	}

	decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
	return true; // ??
}